JP2020200074A - Flanged paper container, and blank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a corner portion of a flange of a paper container having a polygonal flange having an opening on the upper surface, which is composed of a single blank, in an application in which a lid material is heat-sealed on the upper surface of the flange of the paper container to seal the paper container. A through hole, which is a defect, occurs and the contents leak, but the present invention closes the through hole and improves the sealing property. When assembling a paper container, the through holes generated at the corners of the flange are closed by joining a sealing portion formed of a part of a blank to the lower surface of the flange, so that the sealing performance of the paper container is improved. do. [Selection diagram] Fig. 1

Description

The present invention is used for packaging instant noodles, udon noodles, pasta, gratin, various bowls, chilled foods, frozen foods, cold confectionery, confectionery and other foods, and non-foods such as fragrances, detergents, waxes and hairdressers. It relates to a paper container with a flange having an outward flange integrally with an upper opening edge so that a lid material can be attached, and a blank thereof.

Conventionally, there is a paper container with a rectangular flange having a top opening made of a single blank having a shape as disclosed in Patent Document 1, and the upper surface of the flange of the paper container is covered with a lid material. It is used for packaging various foods by heat-sealing the periphery of the lid material and the flange.

Further, in forming the flange of a conventional rectangular paper container with a flange, a through hole, which is a structural defect, occurs in the flange located at the corner of the rectangle, and an invention for closing the through hole is presented. Has been done. The through hole penetrates from the upper surface to the lower surface of the blank, and there is a possibility that the contents may seep through the through hole.

The invention of Patent Document 1 will be described with reference to FIGS. 15 to 17. Since the drawings are symmetrical, the reference numerals are shown only in the right half.
First, a blank for obtaining a paper container 90 with a flange will be described. FIG. 15 shows a blank 60 for the flanged paper container 90, and FIG. 16 is an enlarged view of a corner portion of the blank 60 of FIG. A first side plate 62 is connected to each of the two opposing bottom plate first side sides 71 of the rectangular bottom plate 61 via a mountain fold line, and the bottom plate 61 of the first side plate 62 is different from the bottom plate 61. A first edge piece 63, which is a constituent member of the flange, is continuously provided on the outer side 72 of the first side surface plate on the opposite side via a valley fold line. At the left and right ends of the first edge piece 63 (ends facing the longitudinal direction of the first edge piece 63), first tongue pieces 631 extending in the lateral direction (longitudinal direction of the first edge piece 63) are provided. Has been done.

The left and right first side plate side sides 73 of the first side plate 62 (the sides facing the width direction of the first side plate 62 in the container form) are each folded into an inverted triangular shape via a mountain fold line. The joint plate 621 is continuously provided, and the joint edge piece 622 is continuously provided on the outer side 75 of the first folded joint plate, which is opposite to the bottom plate 61 of the first folded joint plate 621, via a valley fold line. There is.

The joint edge piece 622 forms the same plane as the first tongue piece 631 in a state through a notch. Then, the notch end of the notch that separates the first tongue piece 631 from the joint edge piece 622 and the first folding joint plate 621 is a mountain fold line of the first side plate side side 73 of the first side surface plate 62. And the valley fold line of the first side plate outer side 72 of the first side plate 62 and the valley fold line of the first fold joint plate outer side 75 of the first fold joint plate 621 have reached the gathering point L. By this notch, the first tongue piece 631 is separated from the joint edge piece 622 and the first folding joint plate 621 at the time of box making.

Further, a second side plate 64 is connected to each of the other two opposing bottom plate second side sides 81 of the bottom plate 61 via a mountain fold line, and the bottom plate 61 of the second side plate 64 is provided. A second edge piece 65, which is a constituent member of the flange, is continuously provided on the outer side 82 of the second side surface plate on the opposite side to the above side via a valley fold line. A second tongue piece 651 extending in the lateral direction (longitudinal direction of the second edge piece 65) is provided at each of the left and right ends of the second edge piece 65 (ends facing the longitudinal direction of the second edge piece 65). Has been done.

Then, at the time of box making, the upper part of the mountain fold line of the first side plate side side 73 of the first side plate 62 and the upper part of the valley fold line of the second side plate side side 83 of the second side plate 64 are properly formed. In the overlapped state (the state where the gathering point M overlaps the gathering point L), the second tongue piece 651 of the second edge piece 65 is placed on the upper surface of the first tongue piece 631 of the first edge piece 63 which is valley-folded. If the lower surfaces of the first tongue pieces are overlapped and heat-sealed, even if a fine through hole is generated at the gathering point L extending by the cut end of the first tongue piece 631, this portion is the second side plate 64. 2 The shape is covered by the portion of the gathering point M, which is the upper part of the valley fold line of the side plate side 83.

Further, a protrusion 66 is integrally provided at the end of each of the second tongue pieces 651 on the second side surface plate 64 side. The protrusion 66 is provided so as to be located only in the area above the upper surface of the first edge piece 63 in which the first tongue piece 631 is continuous after box making, and the first side. It is provided so as not to be caught in the bent portion of the valley fold line between the face plate 62 and the first edge piece 63.

Since the packaging material constituting the blank 60 is a thermoplastic resin layer having heat-sealing properties on both sides thereof, if heat-sealing is performed with the upper surface of the first edge piece 63 and the lower surface of the protrusion 66 facing each other, The protrusion 66 is heat-sealed within the heat-sealed region of the first edge piece 63. In this case, since the protrusion 66 does not straddle the valley fold line between the first side plate 62 and the first edge 63, the protrusion 66 is in a flat plate state without being bent. As it is, it is adhered to the first edge piece 63.

The assembly for obtaining the flanged paper container 90 from the blank 60 is performed as follows. That is, the first side plate 62 and the second side plate 64 are bent and assembled into a tray shape, and the inner surfaces of the first folding joint plate 621 and the second folding joint plate 641 are adhered to each other. Next, the bonded first fold-in joint plate 621 and the second fold-in joint plate 641 are bent toward the second side surface plate 64. At the same time, the first edge piece 63, the second edge piece 65, and the joint edge piece 622 are valley-folded, and the first fold-in joint plate 621 and the second fold-in joint plate 641 are bonded to the second side plate. By superimposing on 64, the upper surface of the joint edge piece 622 and the lower surface of the second edge piece 65 overlapping on the upper surface of the joint edge piece 622 face each other, and the opposing joint edge piece 622 and the second edge piece 65 are brought together. Along with heat-sealing, the upper surface of the first tongue piece 631 and the lower surface of the second tongue piece 651 face each other by bending the first side plate 62 and the second side plate 64, and the first tongue piece 631 And the second tongue piece 651 are heat-sealed to form a flange 92 in which the first edge piece 63 and the second edge piece 65 are continuous, and the flanged paper container 90 is assembled (see FIG. 17). ).

At each corner of the flange 92 of the flanged paper container 90, the second tongue piece 651 is superposed on the first tongue piece 631 and adhered by heat sealing, and as described above, the first side plate The gathering point M, which is the upper part of the valley fold line of the second side plate side 83 of the second side plate 64, is densely located at the gathering point L, which is the upper part of the mountain fold line of the first side plate side 73 of 62. Paper containers in an overlapping state have been obtained. Further, the protruding piece 66 is heat-sealed to the upper surface of the first edge piece 63 at the time of heat sealing to form the flange 92 in the flanged paper container 90, and as described above, the first side The flanged paper container 90 is assembled so as to be located only in the area of the heat-sealed surface of the first edge piece 63 without being applied to the face plate 62 side.

Japanese Patent No. 5743618

However, in the invention of Patent Document 1, if the content of the container is a powder or a viscous substance that does not easily flow, it does not leak, but if it is a liquid, it may leak.

That is, when the paper container 90 with a flange is assembled by the paper container assembling device, the first side plate 62 and the second side plate 64 connected to the bottom plate 61 are folded up from the position of the mountain fold line. Due to factors such as the assembly accuracy of the container and the variation in the quality of the blank, the upper part of the mountain fold line on the side side 73 of the first side plate 62 and the side of the second side plate 64 of the second side plate 64. Assembling of the paper container may proceed in a state where the upper part of the valley fold line on the side 83 does not overlap at a predetermined position and is slightly separated. Then, the blank 60 is heat-sealed in the above state. As a result, the protrusion 66 located at the second tongue piece 651 may be in a floating state away from the gathering point L.

Further, since the size and shape of the protrusion 66 are not specified, the effect of preventing the formation of a gap between the lid material and the protrusion 66 is not certain, and the fineness at the gathering point L of the flange 92 is not certain. The problem of leakage of contents from through holes cannot be solved.
Further, when the flanged paper container 90 is viewed from above, even if the through hole at the gathering point L of the flange 92 is blocked by the protrusion 66, the area to be closed is not sufficiently large. In the case of a slightly or osmotic content, the content may seep out through the end face of the blank 60 of the protrusion 66.

The present invention has been made in view of the above situation, and it is possible to reliably close the through holes that may occur at the gathering points L and M of the flanges in the conventional flanged paper container, and to make the contents. It is an object of the present invention to provide a flanged paper container in which the contents do not leak from the through holes that may occur at the gathering points L and M of the flange when the lid material is filled and sealed.

The present invention has solved the above problems by the following aspects.
That is, the first aspect of the present embodiment is in the blank 10 for the flanged paper container 50.
The blank 10 includes a polygonal bottom plate 11 having four or more even-numbered corners.
One of the n sides of the bottom plate 11 is the first bottom plate side side 31, and the side of the bottom plate 11 adjacent to one direction of the first bottom plate side side 31 is the second bottom. The face plate side side 41 is used, and thereafter, the third bottom plate side side 31 to the nth bottom plate side side 41 are used.
The odd-numbered side plates 12 are connected to each of the odd-numbered bottom plate side sides 31 via the mountain fold line, and the even-numbered side plates 12 are connected to each of the even-numbered bottom plate side sides 41 via the mountain fold line. Side plates 14 are installed in series,
An inverted triangular odd-numbered fold with respect to a corner of the bottom plate 11 via a mountain fold line on each of the side sides 33 of the odd-numbered side plate 12 located on both sides of the blank 10 in the circumferential direction. With one side of the joint plate 121
An even-numbered fold in an inverted triangle shape with respect to a corner of the bottom plate 11 via a valley fold line on each of the side sides 43 of the even-numbered side plate 14 located on both sides of the blank 10 in the circumferential direction. With one side of the joint plate 141,
The other side side 34 of each of the odd-numbered fold-in joint plates 121 arranged in the circumferential direction of the blank 10 and the even-numbered fold-in joint plate 141 are arranged in the circumferential direction of the blank 10. The other side side 44 forms a common side side that becomes a mountain fold line,
A joint edge piece 122 is continuously provided on the outer side 35 of each of the odd-numbered folding joint plates 121 on the side serving as the edge of the flanged paper container 50 via a valley fold line.
An odd-numbered edge piece 13 is continuously provided on an outer side 32 of each of the odd-numbered side plates 12 on the side serving as the edge of the flanged paper container 50 via a valley fold line.
The end 131s of each of the odd-numbered edge pieces 13 extending from both ends in the direction along the edge of the flanged paper container 50 are connected to each other via the joint edge piece 122 and the notch 132.
An even-numbered edge piece 15 is continuously provided on the outer side 42 of each of the even-numbered side plates 14 on the side serving as the edge of the flanged paper container 50 via a valley fold line.
Each of the even-numbered edge pieces 15 is provided with end portions 151 extending from both ends in a direction along the edge portion of the flanged paper container 50.
A part of each of the notches 132 is bent with respect to the outer side 35 of the odd-numbered folding joint plate 121 at intervals, and a part of the bent notch 132 and the odd-numbered folding joint plate 121 It is characterized in that a sealing portion 123 is provided between the outer sides 35.

According to the aspect of the present embodiment, when the through holes that may occur at the gathering points A and B of the flanges in the flanged paper container 50 can be closed, and the contents are filled to seal the lid material. Further, it is possible to provide a blank 10 of the flanged paper container 50 in which the contents are less likely to leak from the through holes that may occur at the gathering points A and B of the flange.

The second aspect of the present embodiment is characterized in that the width of the sealing portion 123 between the notch 132 and the outer side 35 of the folded joint plate 121 is 0.5 mm or more and 3 mm or less.

According to the embodiment of the present embodiment, since the shape of the sealing portion 123 is appropriate, it is possible to close the through holes that may occur at the gathering points A and B of the flanges in the flanged paper container 50. When the contents are filled and the lid material is sealed, the contents are less likely to leak from the through holes that may occur at the gathering points A and B of the flange. Further, when the flanged paper container 50 is molded from the blank 10, the blank is less likely to be damaged and is easy to assemble.

In the third aspect of the present embodiment, the end portion C of the notch 132 closer to the odd-numbered side plate 12 is a side 33 of the odd-numbered side plate 12 or the flange of the side 33. It is characterized in that it is in contact with or intersects with the extension line to the edge side of the attached paper container 50, or is at a position immediately before the contact.

According to the aspect of the present embodiment, since the position of the end portion C of the notch 132 is appropriate, the sealing portion 123 having an appropriate shape (strip shape) can be formed, and the flanged paper container 50 can be formed. It is possible to close the through holes that may occur at the gathering points A and B of the flange, and when the contents are filled and the lid material is sealed, the contents become the gathering points A and B of the flange. There is little leakage from the through holes that may occur.

A fourth aspect of the present embodiment is characterized in that the end portion C of the notch 132 closer to the odd-numbered side plate 12 is bent outward of the flanged paper container 50.

According to the embodiment of the present embodiment, when a force is applied to the notch 132 from the outside and the notch 132 is damaged so as to be opened, the terminal portion C is cracked toward the outer periphery of the blank 10. Since the crack does not proceed inward, the notch 132 does not approach the gathering point A, and there is little possibility that the sealing property of the contents is impaired.

In a fifth aspect of the present embodiment, the end portion C of the notch 132 closer to the odd-numbered side plate 12 is a side 33 of the odd-numbered side plate 12 or the flange of the side 33. The outer side of the odd-numbered folding joint plate 121 is bent inward of the flanged paper container 50 at a bending point E away from the extension line of the attached paper container 50 toward the edge side in the direction of the joint edge piece 122. It is characterized in that it is in contact with or intersects with 35, or is a position immediately before contact with 35.

According to the embodiment of the present embodiment, since the inflection point E is provided near the end portion C of the incision 132, when a force is applied to the incision 132 from the outside and the incision 132 is opened, the inflection point is opened. Since the bending angle of E is opened, the external force is dispersed and absorbed, so that the notch 132 is less likely to be damaged. Therefore, the notch 132 does not approach the gathering point A, and there is little possibility that the sealing property of the contents is impaired.

A sixth aspect of the present embodiment is that the end portion C of the notch 132 closer to the odd-numbered side plate 12 and the side 33 of the odd-numbered side plate 12 or the flange of the side 33. The feature is that the distance from the extension line of the attached paper container 50 to the edge side is 0.5 mm or more and 5 mm or less.

According to the embodiment of the present embodiment, when the flanged paper container 50 is formed, the extension line of the side side 33 of the odd-numbered side plate 12 to which a stretching force is applied is separated from the notch 132 in which damage is easily propagated. Therefore, since the notch 132 is less likely to be damaged, there is little possibility that the sealing property of the contents is impaired.

A seventh aspect of the present embodiment is the odd-numbered position from the branch point F returning to the opposite side along the notch 132 from the position of the end portion C of the notch 132 closer to the odd-numbered side plate 12. The notch 133 that branches in the direction of the folding joint plate 121 is provided, and the end portion D of the branching notch 133 is at a position that contacts or intersects with the outer side 35 of the odd-numbered folding joint plate 121, or a position immediately before the contact. It is characterized by.

According to the aspect of the present embodiment, when the notch 133 branching from the notch 132 receives an external force on the notch 132 and the notch 132 is opened, the branching notch 133 is also opened. Since the external force is dispersed and absorbed, damage to the two notches 132 and 133 is unlikely to occur. Therefore, the two notches 132 and 133 do not approach the gathering point A, and there is little possibility that the sealing property of the contents is impaired.

In the eighth aspect of the present embodiment, in the seventh aspect, the position of the branch point F of the branching notch 133 and the side 33 of the odd-numbered side plate 12 or the flange of the side 33 The feature is that the distance from the extension line of the attached paper container 50 to the edge side is 1 mm or more and 5 mm or less.

According to the aspect of the present embodiment, the distance between the branch point F and the side side 33 of the odd-numbered side plate 12 or the extension line of the side side 33 to the edge side of the flanged paper container 50. Is an appropriate distance, so that damage is unlikely to occur when an external force is applied to the notch 132 and the branching notch 133.

A ninth aspect of the present embodiment is a flanged paper container 50 formed by assembling a blank 10 of a flanged paper container according to the first to eighth aspects.

The embodiment of the present embodiment will be further described. From the blank 10 of the flanged paper container 50, each of the side plates 12 and 14 is bent to form a hollow container, and the odd-numbered folding joint plate 121 and the even number are formed. The second folding joint plate 141 is overlapped, and the vicinity of the outer side 35 of the odd-numbered folding joint plate 121 and the vicinity of the outer edge 142 of the even-numbered folding joint plate 141 are placed on the side of the odd-numbered side plate 12. Joined from the side 33 to the side 43 of the even-numbered side plate 14, and the two overlapped joining plates 121 and 141 are further bent and overlapped on the outer surface side of the even-numbered side plate 14. The odd-numbered edge piece 13, the even-numbered edge piece 15, and the joint edge piece 122 are valley-folded, respectively, and the two joint plates 121 and 141 are overlapped with the even-numbered side plate 14 so as to be relative to each other. The upper surface of the end 131 of the odd-numbered edge piece 13 and the lower surface of the end 151 of the even-numbered edge 15 are bonded to each other, and the lower surface of the joint edge 122 and the odd-numbered edge 13 A flanged paper container 50 in which the lower surface of the end 131 and the lower surface of the even-numbered edge piece 15 face each other and are joined to form a flange 52.

According to the aspect of the present embodiment, it is possible to close the through hole that may occur at the gathering point of the corner portion of the flange of the conventional paper container, and when the contents are filled and the lid material is sealed, the contents It is less likely that an object will leak from the gathering point at the corner of the flange.

According to the present invention, it is possible to close a through hole that may occur at a gathering point of a flange of a conventional paper container, and when the content is filled and the lid material is sealed, the content becomes the above-mentioned. It is possible to provide a paper container with a flange that hardly leaks from the gathering point of the corner portion of the flange.

It is a figure of the blank of the rectangular flanged paper container which has the 1st cut form of 1st Embodiment. It is an enlarged view of the corner part of the blank of the rectangular paper container with a flange of FIG. It is an enlarged view of the corner part of the rectangular flanged paper container which has the 2nd cut form of 4th aspect. It is an enlarged view of the corner part of the rectangular flanged paper container which has the 3rd cut form of the 5th aspect. FIG. 5 is an enlarged view of a corner portion of a rectangular paper container with a flange having a fourth notch form according to a seventh aspect. It is a perspective view of the rectangular flanged paper container of the 1st aspect. It is an enlarged view of the corner portion of the rectangular paper container with a flange of FIG. It is a figure of the blank of the hexagonal flanged paper container of the first aspect. It is an enlarged view of the corner part of the blank of the hexagonal flanged paper container of FIG. It is a perspective view of the hexagonal flanged paper container of the 1st aspect. It is a figure of the blank of the paper container with an octagonal flange of the first aspect. It is an enlarged view of the corner part of the blank of the paper container with an octagonal flange of FIG. It is a perspective view of the paper container with an octagonal flange of the 1st aspect. An enlarged view of the corner portion of the octagonal flanged paper container of FIG. 13 as viewed from below. It is a figure of the blank of the paper container with a flange which concerns on the prior art. It is an enlarged view of the corner part of the blank of the paper container with a flange of FIG. It is a perspective view of the paper container with a flange which concerns on the prior art.

Hereinafter, embodiments according to the present invention will be described in more detail with reference to the drawings. However, the present invention is not limited to these specifically exemplified forms and various concretely described configurations.
In each drawing, the size and ratio of the members may be changed or exaggerated for the sake of clarity. In addition, for the sake of readability, unnecessary parts for explanation and repeated codes may be omitted.

FIG. 1 is a blank view of the rectangular flanged paper container 50 of the first aspect. Since the bottom plate 11 has a rectangular shape, when the assembled paper container 50 with a flange is observed from above the opening surface, a rectangular container (see FIG. 6) is observed.

FIG. 1 is a drawing showing a blank 10 before assembling a paper container 50 with a flange. Since FIG. 1 is vertically and horizontally symmetrical, the reference numerals are shown only in the right half.

It should be noted that this is one form (first notch form) of the notch 132 of the end 131 of the odd-numbered edge piece 13 shown in FIG. 1, and in the present embodiment, the notch 132 is in addition to the first notch form. There are a second cut form, a third cut form, and a fourth cut form.
Further, FIG. 2 is an enlarged view of a corner portion of FIG. The four corners of FIG. 1 have the same shape, and one of them is enlarged in FIG.

Although the bottom plate 11 of the blank 10 shown in FIG. 1 has a rectangular shape, it can be developed into a polygonal shape having an even number of corners such as a hexagonal shape and an octagonal shape.

In the rectangular paper container 50 with a flange, one of the four sides of the rectangular bottom plate 11 is set as the first bottom plate side side 31, and the first bottom plate side side 31 is counterclockwise. The side of the bottom plate 11 adjacent to the direction is designated as the second bottom plate side side 41, the third (odd number) bottom plate side side 31, and the fourth (even number) bottom plate side side 41. The fourth bottom plate side side 41 is adjacent to the first bottom plate side side 31, and the rectangle of the bottom plate 11 is closed.

Since the bottom plate has a polygonal shape having four or more even-numbered corners in the present embodiment, the odd-numbered bottom plate side 31 and the even-numbered bottom plate side 41 are alternately present and the same. Kind of bottom plate side sides, specifically odd-numbered bottom plate side sides 31 and even-numbered bottom plate side sides 41 are not adjacent to each other.

The odd-numbered side plates 12 are connected to each other via the odd-numbered bottom plate side 31s consisting of the first and third, respectively, and the even-numbered bottom plate side 41s composed of the second and fourth sides 41, respectively. The even-numbered side plates 14 are continuously provided via the above. That is, around the bottom plate 11, two odd-numbered side plates 12 and two even-numbered side plates 14 are alternately provided in series.

The odd-numbered side plates 12 are continuously provided on each of the odd-numbered bottom plate side sides 31 via a mountain fold line. An inverted triangular odd-numbered side plate 11 having a corner of the bottom plate 11 as an apex via a mountain fold line on each of the odd-numbered side sides 33 located on both sides of the blank 10 of the odd-numbered side plate 12 in the circumferential direction. It is provided with one side of the folding joint plate 121.

Similarly, the even-numbered side plates 14 are continuously provided on each of the even-numbered bottom plate side sides 41 via a mountain fold line. An inverted triangular even number with a corner of the bottom plate 11 as an apex via a valley fold line on each of the even number side sides 43 located on both sides of the blank 10 of the even number side plate 14 in the circumferential direction. It is provided with one side of the folding joint plate 141.

The side 34 on the side opposite to the odd-numbered side plate 12 arranged in the circumferential direction of the blank 10 of the odd-numbered fold-in joint plate 121 and the circumferential direction of the blank 10 of the even-numbered fold-in joint plate 141. The side side 44 on the opposite side of the even-numbered side plate 14 arranged in is a common side side forming a mountain fold line.

Then, in each of the odd-numbered fold-in joint plates 121, a joint edge piece 122 is continuously provided on the outer side 35 on the side serving as the edge portion of the flanged paper container 50 via a valley fold line.

An odd-numbered edge piece 13 is continuously provided on each of the odd-numbered side plates 12 via a valley fold line on the outer side 32 on the side serving as the edge of the flanged paper container 50.
Then, end portions 131 extending from both ends of the odd-numbered edge piece 13 in a direction along the edge portion of the flanged paper container 50 are connected to the joint edge piece 122 via a notch 132.

The joint edge piece 122 forms the same plane as the end portion 131 of the odd-numbered edge piece 13 through the notch 132.
Then, the notch 132 that separates the end 131 of the odd-numbered edge piece 13 from the joint edge piece 122 faces inward of the container from the outer edge 124 of the joint edge piece 122, and further, the odd-numbered edge piece is further ahead. Turn toward the center of 13. The notch 132 is spaced from the outer side 35 of the odd-numbered folding joint plate 121, and does not come into contact with the outer side 35 of the odd-numbered folding joint plate 121. The notch 132 includes a mountain fold line on the side side 33 of the odd-numbered side plate 12, a valley fold line on the outer side 32 of the odd-numbered side plate 12, and an outer side of the odd-numbered fold-in joint plate 121. It reaches the vicinity of the gathering point A with the valley fold line of 35, but does not come into contact with the gathering point A.

There is a sealing portion 123 in the gap between the notch 132 and the outer side 35 of the odd-numbered folding joint plate 121. The sealing portion 123 has an effect of closing a through hole that may occur at the gathering point B when the flanged paper container 50 is assembled. Details will be described later.

Further, the end portion C of the notch 132 is in contact with or intersects the side 33 of the odd-numbered side plate 12 or the extension line of the side 33 to the edge side of the flanged paper container 50, or This is the position just before the contact. By doing so, the sealing portion 123 having a sufficient area is obtained in the vicinity of the gathering point A, and the effect of closing the through hole that may occur at the gathering point B can be obtained.
Further, the notch 132 separates the end 131 of the odd-numbered edge piece 13 from the joint edge piece 122 when the flanged paper container 50 is assembled.

Further, an even-numbered edge piece 15 is continuously provided on the outer side 42 of the even-numbered side plate 14 on the side serving as the edge of the flanged paper container 50 via a valley fold line.
Then, end portions 151 extending from both ends of the even-numbered edge piece 15 in a direction along the edge portion of the flanged paper container 50 are provided.

The side 44 of the even-numbered folding joint plate 141, which forms a common side with the side 34 of the odd-numbered folding joint plate 121, is mountain-folded to form a blank 10 for the flanged paper container 50. The side plates 12 and 14 are bent to form a hollow container, and the odd-numbered folding joint plates 121 and the even-numbered folding joint plates 141 are overlapped with each other. Then, the two folded joint plates 121 and 141 that are overlapped are further bent and overlapped on the outer surface side of the even-numbered side plate 14. Further, the odd-numbered edge piece 13, the even-numbered edge piece 15, and the joint edge piece 122 are each valley-folded.
Then, the upper surface of the end 131 of the odd-numbered edge piece 13 and the lower surface of the end 151 of the even-numbered edge 15 which are opposed to each other by the means are joined.

When assembling the paper container 50 with a flange, the upper part of the mountain fold line on the side 33 of the odd-numbered side plate 12 and the upper part of the valley fold line on the side 43 of the even-numbered side plate 14 are appropriate. On the upper surface of the end 131 extending from the odd-numbered edge piece 13 that was valley-folded in the state of overlapping with (the state where the collection point B overlaps the collection point A), the even-numbered edge piece 15 extends. When the ejected end portions 151 are overlapped and heat-sealed, the gathering point B, which is the intersection of the outer edge 152 of the end portion 151 of the even-numbered edge piece 15 and the outer edge 142 of the even-numbered folding joint plate 141, is formed. Even if a fine through hole is generated, the through hole portion is covered with the sealing portion 123.

Since the gathering point B is an intersection of the outer edge 152 of the end portion 151 of the even-numbered edge piece 15 and the outer edge 142 of the even-numbered folding joint plate 141, a through hole is likely to occur in the flange 52. It is a place. The sealing portion 123 has an action of closing the through hole that may occur at the gathering point B from the lower surface side of the flange 52 when the flanged paper container 50 is assembled.

Since the packaging material constituting the blank 10 is provided with a thermoplastic resin layer having heat-sealing properties on both sides thereof, the lower surface of the even-numbered edge piece 15 and the end portion 151 of the even-numbered edge piece 15 and the sealing. If the heat seal is performed with the upper surfaces of the portions 123 overlapped with each other, the periphery of the through hole that may occur at the gathering point B can be sealed, and the through hole can be closed.

By the procedure as described above, the flanges 52 that are continuous in a circular shape are formed, and the rectangular paper container 50 with a flange of the present embodiment is assembled (see FIG. 6).

The assembly procedure for obtaining the flanged paper container 50 from the blank 10 will be described in more detail. The upper surface of the blank 10 indicates the side in contact with the contents, and the lower surface indicates the opposite side. Further, the upper surface of the paper container 50 with a flange indicates a surface (top surface) on which the contents are to be inserted, and the surface opposite to the lower surface.

The odd-numbered side plate 12 and the even-numbered side plate 14 are bent and assembled into a hollow container shape, and the vicinity of the outer side 35 of the odd-numbered folding joint plate 121 and the outer edge 142 of the even-numbered folding joint plate 141. The vicinity is continuously heat-sealed from the side 33 of the odd-numbered side plate 12 to the side 43 of the even-numbered side plate 14.

Next, the heat-sealed odd-numbered folding joint plate 121 and even-numbered folding joint plate 141 are bent toward the even-numbered side plate 14. At the same time, the odd-numbered edge piece 13, the even-numbered edge piece 15, and the joint edge piece 122 are valley-folded, respectively, and the odd-numbered fold-in joint plate 121 and the even-number fold-in joint plate 141 are heat-sealed. Is bent and overlapped on the outer surface side of the even-numbered side plate 14. As a result, the upper surface of the joint edge piece 122 and the lower surface of the even-numbered edge piece 15 overlapping the upper surface of the joint edge piece 122 face each other, and the opposite joint edge piece 122 and the even-numbered edge piece 15 are heat-sealed. To do.

Then, by bending the odd-numbered side plate 12 and the even-numbered side plate 14, the upper surface of the end 131 of the odd-numbered edge piece 13 and the lower surface of the end 151 of the even-numbered edge 15 are formed. In contrast, it is heat-sealed. Then, the odd-numbered edge piece 13 and the even-numbered edge piece 15 are continuous.

By the above procedure, a continuous flange 52 is formed in a circular shape, and a rectangular paper container 50 with a flange is assembled (see FIG. 6).

FIG. 7 is an enlarged view of the corner portion of FIG. 6, which is viewed from the inner surface side of the flanged paper container 50.
At each corner of the flange 52 of the flanged paper container 50, the end 151 of the even-numbered edge piece 15 is superposed on the end 131 of the odd-numbered edge piece 13 and joined by heat sealing. As described above, the side 43 of the even-numbered side plate 14 is located at the gathering point A, which is the upper part of the mountain fold portion at the mountain fold line position of the side 33 of the odd-numbered side plate 12. A paper container 50 with a flange is obtained in which the gathering points B, which are the upper parts of the valley fold portion at the valley fold line position, overlap.

Further, since the gathering point B is the intersection of the outer edge 152 of the end portion 151 of the even-numbered edge piece 15 and the outer edge 142 of the even-numbered folding joint plate 141, the end face of the blank 10 is exposed. , It becomes a factor that causes a through hole. However, the gathering point A is a place where the odd-numbered side plate 12, the odd-numbered folding joint plate 121, the odd-numbered edge piece 13, and the sealing portion 123 are gathered, and the blank 10 The end face is not exposed. The above-mentioned shape is formed because the notch 132 does not reach the gathering point A and is spaced from the outer side 35 of the odd-numbered folding joint plate 121 to form the sealing portion 123. Due to the formation of.

Since the shape of the sealing portion 123 becomes strip-shaped by having a gap between the notch 132 and the outer side 35 of the odd-numbered folding joint plate 121 as described above, the stress generated during molding of the paper container causes the above. Damage to the sealing portion 123 can be reduced.
Further, the sealing portion 123 and the joining edge piece 122 are interposed via a notch 132, and by forming the blocking portion 123 into a band shape, the shape of the end portion 131 of the odd-numbered edge piece 13 becomes irregular. Be appropriate without. Therefore, the shape of the contact portion between the upper surface of the end 131 of the odd-numbered edge piece 13 and the lower surface of the end 151 of the even-numbered edge piece 15 becomes appropriate, so that the joining is appropriately performed. The flange 52 with less leakage can be formed.

As described above, the portion near the set point A on the odd-numbered side plate 12 side is properly positioned with respect to the set point B, and the end face of the blank 10 is not exposed in the vicinity of the set point A. Therefore, the portion near the gathering point A is a surface without holes. Since the lower side of the gathering point B is closed by the upper surface of the blank 10 in the vicinity of the gathering point A, the through holes at the gathering point L and the gathering point M generated in the flanged paper container manufactured by the prior art are formed. It becomes difficult to occur. Therefore, when the contents are filled and then covered with the lid material and joined to the flange 52, the contents are less likely to seep out from the through holes of the gathering points A and B.

Here, it is desirable that the width of the joint edge piece 122 is narrower than the width of the even-numbered edge piece 15. This is aesthetically pleasing because only the edge piece 15 of the flange 52 can be seen and the end face of the flange 52 cannot be seen twice by making the joint edge piece 122 invisible when viewed from the upper surface side. Because. The width of the joint edge piece 122 is preferably 0.5 mm to 3 mm narrower than the width of the even-numbered edge piece 15, and if it is smaller than 0.5 mm, the assembly accuracy of the flanged paper container is poor. If the joint edge piece 122 protrudes and is larger than 3 mm, an effective joint area cannot be obtained, and the joint force between the joint edge piece 122 and the even-numbered edge piece 15 is inferior.

FIG. 8 is a blank 10 of a flanged paper container 50 in which the bottom plate 11 has a hexagonal shape, and FIG. 9 is an enlarged view of a corner portion of FIG.
The bottom plate 11 does not have to have a regular hexagonal shape. In the case of a regular hexagonal shape, the size of each internal angle is 120 °.
FIG. 10 shows a paper container 50 with a flange having a hexagonal bottom plate 11.

In the hexagonal flanged paper container 50, one of the six sides of the hexagonal bottom plate 11 is set as the first bottom plate side side 31, and the counterclockwise direction of the first bottom plate side side 31 is used. The side of the bottom plate 11 adjacent to the bottom plate 11 is set as the second bottom plate side side 41, and the third (odd number) bottom plate side side 31, the fourth (even number) bottom plate side side 41, and the fifth ( The odd-numbered side of the bottom plate is 31 and the sixth (even-numbered) side of the bottom plate is 41. The sixth bottom plate side side 41 is adjacent to the first bottom plate side side 31, and the hexagonal shape of the bottom plate 11 is closed.

The odd-numbered side plates 12 are connected to each other via the odd-numbered bottom plate side 31s consisting of the first, third, and fifth, and the even-numbered bottoms consisting of the second, fourth, and sixth. An even-numbered side plate 14 is continuously provided via each of the side plates 41. That is, three odd-numbered side plates 12 and three even-numbered side plates 14 are alternately arranged around the bottom plate 11.

The sides and various plates of the odd-numbered side plates 12 provided at both ends of the blank 10 in the circumferential direction, and the sides and plates provided in the outer edge direction of the blank 10 have a rectangular bottom plate 11 as described above. It is the same component as the blank 10.
Further, each side provided on the odd-numbered side plate 12 and each side and each plate connected to each plate are also the same components as the blank 10 having a rectangular bottom plate 11.

The sides and various plates of the even-numbered side plates 14 provided at both ends of the blank 10 in the circumferential direction, and the sides and plates provided in the outer edge direction of the blank 10 have a rectangular bottom plate 11 as described above. It is the same component as the blank 10.
Further, each side provided in the even-numbered side plate 14 and each side and each plate connected to each plate are also the same components as the blank 10 having a rectangular bottom plate 11.

Therefore, since the component of the hexagonal blank 10 on the bottom plate 11 is the same as the component of the rectangular blank 10 described above, the description of the structure of the hexagonal blank 10 will be omitted.

FIG. 11 is a blank 10 of a flanged paper container 50 in which the bottom plate 11 has an octagonal shape, and FIG. 12 is an enlarged view of a corner portion of FIG.
The bottom plate 11 does not have to have a regular octagonal shape. In the case of a regular octagon, the size of each internal angle is 135 °.
FIG. 13 shows a paper container 50 with a flange having an octagonal bottom plate 11.

FIG. 14 is an enlarged view of a corner portion of the flanged paper container 50 of FIG. 13, which is viewed from the lower surface side of the flanged paper container 50, and the flange 52 is viewed from the lower side. The through holes that may occur at the gathering point B are hidden by the odd-numbered side plate 12 near the gathering point A, the odd-numbered folding joint plate 121, the odd-numbered edge piece 13, and the sealing portion 123. It is not visible from the underside of the flanged paper container 50.
Further, since no through hole is generated in the vicinity of the gathering point A, there is an effect of closing the through hole of the gathering point B by joining from the lower side of the flange 52.

In the octagonal flanged paper container 50, one of the eight sides of the octagonal bottom plate 11 is set as the first bottom plate side side 31, and the counterclockwise direction of the first bottom plate side side 31 is used. The side of the bottom plate 11 adjacent to is designated as the second bottom plate side side 41, and the third (oddth) bottom plate side side 31, the fourth (eventh) bottom plate side side 41, and the fifth ( The bottom plate side side 31 of the odd-th), the bottom plate side 41 of the 6th (eventh), the bottom plate side 31 of the 7th (oddth), and the bottom plate side 41 of the 8th (eventh). .. The eighth bottom plate side side 41 is adjacent to the first bottom plate side side 31, and the octagonal shape of the bottom plate 11 is closed.

The odd-numbered side plates 12 are connected through each of the odd-numbered bottom plate side 31s consisting of the first, third, fifth, and seventh, and the second, fourth, sixth, and eighth side plates are connected. An even-numbered side plate 14 is continuously provided via each of the even-numbered bottom plate side sides 41. That is, four of the odd-numbered side plates 12 and four of the even-numbered side plates 14 are alternately arranged around the bottom plate 11.

The sides and various plates of the odd-numbered side plates 12 provided at both ends of the blank 10 in the circumferential direction, and the sides and plates provided in the outer edge direction of the blank 10 have a rectangular bottom plate 11 as described above. It has the same configuration as the blank 10.
Further, each side provided on the odd-numbered side plate 12 and each side and each plate connected to each plate have the same configuration as the blank 10 having a rectangular bottom plate 11.

The sides and various plates of the even-numbered side plates 14 provided at both ends of the blank 10 in the circumferential direction, and the sides and plates provided in the outer edge direction of the blank 10 have a rectangular bottom plate 11 as described above. It has the same configuration as the blank 10.
Further, each side provided on the even-numbered side plate 14 and each side and each plate connected to each plate have the same configuration as the blank 10 having a rectangular bottom plate 11.

Therefore, since the components of the blank 10 having the octagonal shape of the bottom plate 11 are the same as the components of the rectangular blank 10 described above, the description of the structure of the octagonal blank 10 will be omitted.

The method of assembling the paper container 50 with a flange having a hexagonal bottom plate 11 and the paper container 50 having a flange having an octagonal bottom plate 11 is the same as the method of assembling the paper container 50 having a flange having a rectangular bottom plate 11. Therefore, the explanation is omitted.

The component of the blank 10 when the bottom plate 11 has a polygonal shape having an even number of angles of 10 or more is the same as the component of the rectangular blank 10 described above.

When assembling the flanged paper container 50, the side sides 33 of the odd-numbered side plate 12 are bent at the same angle as the corner of the bottom plate 11. That is, if it is a rectangle, it is 90 °, if it is a regular hexagon, it is 120 °, and if it is a regular octagon, it is 135 °. That is, when the bottom plate 11 has a rectangular shape, the angle at which the side 33 of the odd-numbered side plate 12 is bent is 90 °, and when the bottom plate 11 has a regular hexagonal shape, the odd-numbered side plate 12 is bent. The angle at which the side side 33 of 12 is bent is 60 °, and in the case of a regular octagonal shape, the angle at which the side side 33 of the odd-numbered side plate 12 is bent is 45 °. As the number of angles of the polygonal shape increases, the bending angle of the side side 33 of the odd-numbered side plate 12 becomes smaller.

The sealing portion 123 located in the vicinity of the gathering point A, which is the end of the side 33 of the odd-numbered side plate 12 on the edge side of the paper container, is formed when the side 33 of the odd-numbered side plate 12 is bent. In addition, the edge of the sealing portion 123 near the end portion C of the notch 132 on the paper container edge side is extended so as to be bent around the gathering point A.

As an example, the distance between the end portion C of the notch 132 on the extension line of the side side 33 of the odd-numbered side plate 12 and the gathering point A is set to "r", and the side side 33 of the odd-numbered side plate 12 Assuming that the bending angle of is "α", the sealing portion 123 near the terminal portion C is extended by the length of "(π × r × α) / 180". If the elongation of this length becomes excessive, damage such as cracks may occur in the blank 10 (see FIG. 2). If θ is the size of the internal angle of the bottom plate 11, α is 180−θ. The unit of α and θ is degree “°”.

If the damage occurs near the gathering point A, it may not be possible to close the through hole that may occur at the gathering point B at the corner of the flange 52. As can be seen from the above equation, the length of extension of the side of the closed portion 123 of the blank 10 on the edge side of the paper container is proportional to r and α, so that r is smaller and α is smaller, that is, θ is The larger one allows the flanged paper container 50 to be assembled without damaging the blank 10.

However, if the distance r is too small, it is not possible to secure a sufficiently large width of the blocking portion 123, and if it is too large, the outer edge of the blocking portion 123 may be excessively extended and the blank 10 may be damaged. There is. The distance r can be substantially regarded as the width of the sealing portion 123, and the width is preferably 0.5 mm or more and 3 mm or less.

Further, it is desirable that the bending angle α of the side side 33 of the odd-numbered side plate 12 is small, but the angle α is substantially determined by the shape of the container.
In a paper container with a flange having a bottom plate having a specific number of angles, it is desirable that the internal angles of the bottom plates are equiangular because the angle α can be minimized. When the bottom plate is hexagonal, the bending angle α of the side 33 of the odd-numbered side plate 12 is smaller than when the bottom plate is rectangular, so that the paper container edge side of the sealing portion 123 of the blank 10 It is desirable because the side of the paper is not stretched and the risk of damage is reduced. A polygonal shape having a larger number of corners than a hexagonal shape has a smaller angle α, so that the risk of damage to the side of the closed portion 123 of the blank 10 on the paper container edge side is further reduced.

Further, when the number of angles of the bottom plate is an even number of 4 or more and the size of the internal angles is the same, the facing sides of the flanges 52 of the flanged paper container 50 are parallel. Further, in each of the constituent plates of the blank 10, the vertical direction and the horizontal direction are symmetrical, so that a stable appearance is obtained.

The case of the first notch form, which is one form of the notch 132, has been described above.
The second cut form, the third cut form, and the fourth cut form, which will be described below, are modifications of the cut 132. Further, although the drawing is described with the example of the blank 10 of the rectangular paper container 50 with a flange, the drawing is not limited to the rectangular shape, and is expanded to the flanged paper container 50 of the bottom plate 11 having an even number of 4 or more corners. it can.

FIG. 3 shows a second form of the notch 132, in which the end portion C of the notch 132 is bent toward the outer edge of the paper container.
By doing so, when a tearing force is applied to the notch 132, the notch 132 propagates toward the edge of the paper container, so that the notch 132 does not easily reach the gathering point A. Therefore, since the area of the blocking portion 123 is secured, the function of closing the gathering point B is maintained.

As shown in FIG. 3, the odd-numbered side plate 12, the odd-numbered edge piece 13, the odd-numbered folding joint plate 121, and the sealing portion 123 are present in the vicinity of the gathering point A, and a through hole is formed. Absent. Leakage of the flange can be prevented by closing the through hole that may occur in the vicinity of the gathering point B with the member of the blank 10 in the vicinity of the gathering point A.

FIG. 4 shows a third form of the notch 132, in which the end portion C of the notch 132 is formed on the joint edge piece 122 from an extension line of the side side 33 of the odd-numbered side plate 12 in the direction of the paper container edge. At bending points E separated in the direction, the odd-numbered folding joint plate 121 is bent toward the outer side 35. It is desirable that the end portion C of the notch 132 is located near the outer side 35 of the odd-numbered folding joint plate 121 or is in contact with the outer side 35 of the odd-numbered folding joint plate 121, but intersects. May be good.

By doing so, when a tearing force is applied to the notch 132, the force is applied to the bending point E or the end portion C, and when damage occurs, the force is distributed to the above two locations. Will be done. Therefore, since the area of the blocking portion 123 is secured, the function of closing the gathering point B is maintained.
Further, if the end portion C of the notch 132 is largely separated from the gathering point A, a large load may be applied to the separated sealing portion 125 separated from the sealing portion 123 by the notch 132 to damage the sealing portion 123. In that case, the through hole that may occur at the gathering point B cannot be closed.

For the above reason, the end portion C of the notch 132 and the side 33 of the odd-numbered side plate 12, the side 33 of the odd-numbered side plate 12, or the flanged paper container 50 of the side 33 It is desirable that the distance from the extension line to the edge side of the paper is 0.5 mm or more and 5 mm or less.

As shown in FIG. 4, the odd-numbered side plate 12, the odd-numbered edge piece 13, the odd-numbered folding joint plate 121, and the separation sealing portion 125 are present in the vicinity of the gathering point A, and a through hole is formed. Not happening. Since the blocking portion 123 is separated by the notch 132, it does not exist in the vicinity of the gathering point A. Leakage of the flange can be prevented by closing the through hole that may occur in the vicinity of the gathering point B by the member of the blank 10 of the separation sealing portion 125 near the gathering point A.

Further, even if the terminal portion C is damaged and the damage extends to the odd-numbered folding joint plate 121, the vicinity of the outer side 35 of the odd-numbered folding joint plate 121 and the even-numbered folding joint plate 121 are present. Since the vicinity of the outer edge 142 of 141 is continuously heat-sealed from the side 33 of the odd-numbered side plate 12 to the side 43 of the even-numbered side plate 14, there is a risk of leaking the contents. This is low.

FIG. 5 shows a fourth form of the notch 132, which is a branch point F separated from the extension line of the side side 33 of the odd-numbered side plate 12 in the direction of the paper container edge in the direction of the joint edge piece 122. There is a notch 133 that branches toward the outer side 35 of the odd-numbered fold-in joint plate 121, and the end portion D of the branching notch 133 is located in the vicinity of the outer side 35 of the odd-numbered fold-in joint plate 121. Alternatively, it is desirable that it touches the outer side 35 of the odd-numbered folding joint plate 121, but it may intersect.
Further, the end portion C of the original notch 132 that has not branched is located near the extension line of the side side 33 of the odd-numbered side plate 12 in the direction of the edge of the paper container, or is in contact with the extension line. Is desirable, but may intersect.

By doing so, when a tearing force is applied to the two notches 132 and 133, the force is applied to the end D of the branching notch 133 and the end C of the original notch 132. When damage occurs, it is dispersed in the above two places, and each damage becomes small. Therefore, since the region of the separation / blocking portion 125 is secured, the function of closing the gathering point B is maintained.

When the position of the branch point F of the branching notch 133 is close to the extension line of the side side 33 of the odd-numbered side plate 12 in the direction of the paper container edge, the end portion D of the branching notch 133 is the gathering point. Since it is too close to A, it becomes impossible to close the through hole that may occur at the assembly point B.

Even if the end portion D is damaged and the damage extends to the odd-numbered folding joint plate 121, the vicinity of the outer side 35 of the odd-numbered folding joint plate 121 and the even-numbered folding joint plate 121 Since the vicinity of the outer edge 142 of 141 is continuously heat-sealed from the side 33 of the odd-numbered side plate 12 to the side 43 of the even-numbered side plate 14, there is a risk of leaking the contents. This is low.

When the position of the branch point F of the branching notch 133 is far from the extension line of the side side 33 of the odd-numbered side plate 12 in the direction of the paper container edge, it is separated from the blocking portion 123 by the branching notch 133. A large load may be applied to the separated sealing portion 125 and the separated sealing portion 125 may be damaged. In that case, the through hole that may occur at the gathering point B cannot be closed.

For the above reason, the position of the branch point F of the branching notch 133 and the side 33 of the odd-numbered side plate 12 or the extension line of the side 33 to the edge side of the flanged paper container 50. It is desirable that the distance is 1 mm or more and 5 mm or less.

As shown in FIG. 5, the odd-numbered side plate 12, the odd-numbered edge piece 13, the odd-numbered folding joint plate 121, and the separation sealing portion 125 are present in the vicinity of the gathering point A, and a through hole is formed. Not happening. Further, since the blocking portion 123 is separated by the branching notch 133, it does not exist in the vicinity of the gathering point A. The member of the blank 10 in the vicinity of the gathering point A can prevent leakage of the flange by closing the through hole that may occur in the vicinity of the gathering point B.

Here, the material of the blank 10 will be described. The blank 10 is a laminate in which a thermoplastic resin layer is provided on one side or both sides of a paper base material layer mainly made of paper. As the paper, paperboard such as white balls, Manila balls, cup base paper, card paper, and ivory paper is used. It is desirable that the paper used for food containers does not contain recycled paper. The basis weight of the paper is appropriately determined depending on the container size and the intended use, but it is preferable to use a paper of 150 to 400 g / m ² . If it is less than 150 g / m ² , the rigidity of the container is small and the container is easily deformed. On the other hand, if it exceeds 400 g / m ² , the thickness of the blank 10 increases, so that ruled cracks are likely to occur when bending along the ruled line. In addition, excessive basis weight of paper is a factor of cost increase.

Further, the intermediate layer may be provided with a film layer, if necessary.
When the flanged paper container 50 is required to have water vapor barrier property and oxygen barrier property, aluminum foil, aluminum vapor-deposited polyethylene terephthalate, polyvinylidene chloride film (PVDC), polyvinyl alcohol film (PVA), etc. are used as the film layer of the gas barrier layer. Gas barrier films such as ethylene vinyl alcohol copolymer film (EVOH), gas barrier nylon film, gas barrier polyethylene terephthalate film, and inorganic oxides obtained by depositing inorganic oxides such as aluminum oxide and silicon oxide on polyethylene terephthalate film and the like. A gas barrier coating layer such as a vapor-deposited film, a polyvinylidene chloride coating, a film containing a water-soluble resin and an inorganic layered compound, or a film formed by reacting a metal alkoxide or its hydrolyzate with an isocyanate compound can be used. it can.

The thermoplastic resin layers provided on both sides of the paper base material layer are provided by joining the necessary parts to keep the flanged paper container 50 in the shape of the container and sufficiently joining the necessary parts. Has the role of preventing leakage. In the flanged paper container 50 of the present embodiment, in order to prevent the contents from leaking, the members of the flanges 52 must be sufficiently joined to prevent the contents from leaking. As the material of the thermoplastic resin layer, a polyethylene-based resin is preferable, and for example, low density polyethylene (LDPE), linear low density polyethylene (L-LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), etc. Ethethylene-vinyl acetate copolymer (EVA), ionoma-resin, ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methacrylate copolymer (EMAA), ethylene -Methyl methacrylate copolymer (EMMA), an acid-modified polyolefin resin obtained by modifying a polyethylene resin with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and itaconic acid, polyvinyl acetate. Examples thereof include based resins, and additives may be added as appropriate, if necessary. Alternatively, a multi-layer structure composed of LDPE / MDPE / LDPE, LDPE / HDPE / LDPE, or the like may be used.

When heat resistance is required, the thermoplastic resin layer can be polypropylene, and homopolypropylene, random polypropylene, block polypropylene, and two or three blended resins from the above resins can be used. .. Further, the polyethylene-based resin described in the preceding paragraph can be blended with the above-mentioned single resin or blended resin in order to facilitate the processing of the container. The container processing step is, for example, a step of coating a paper base material layer with a thermoplastic resin layer or a step of assembling a container.
The amount of the polyethylene resin added is preferably 5% by weight to 50% by weight. If it is less than 5% by weight, improvement in workability cannot be expected, and if it exceeds 50% by weight, a decrease in heat resistance is observed.

For applications that require higher heat resistance than polypropylene, for example, for heating oily contents or for cooking in a microwave oven or hot air oven in a container, laminate it on a paper substrate layer. A resin having a higher melting point may be used for the surface resin layer. As the above resin, for example, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polymethylpentene resin (TPX) and the like can be used.

Unlike the paper cup, the flanged paper container 50 of the present embodiment does not have a thread tail portion, so that the thread tail portion does not generate heat during cooking in a microwave oven and charring does not occur unlike a paper cup. Since it has such characteristics, by using a resin having more heat resistance for the surface resin layer, a paper container more suitable for microwave cooking can be obtained.

Various joining methods are used as the laminating method of the laminated body of the blank 10, but preferably, an extrusion coating method in which a molten thermoplastic resin is coated on both sides or one side of a base material layer mainly made of paper is used. desirable. When the film is bonded to the paper substrate layer, a method suitable for the processing material such as a dry laminating method or an extrusion coating method is selected.

The raw fabric of the blank 10 coated with the thermoplastic resin layer in the above step is sent to the punching step and punched into the shape of the blank 10. The punching method is a known punching method such as a Thomson punching method, a rotary die-cutting method, a CAD cutting method, a laser cutting method, or a Dorsler method. The punching method is appropriately selected in consideration of production quantity, production speed, quality requirement, cost and the like. The removed blanks 10 are stacked and stored in the same direction.

Further, the blank 10 is subjected to folding rule processing at the same time as the punching process or in a separate process. The folding rule processing may be performed before or after the punching process.

In order to assemble the flanged paper container 50 of the present embodiment from the blank 10, the odd-numbered side plates 12 and the even-numbered side plates 14 are bent into a hollow container shape. Then, the side side 34 of the odd-numbered folding joint plate 121 (opposite to the odd-numbered side plate 12) and the side side 44 of the even-numbered folding joint plate 141 (opposite to the even-numbered side plate 14). Is a common side, and the side sides 34 and 44 of the folding joint plate are mountain-folded as mountain fold lines, and the odd-numbered folding joint plate 121 is folded in the vicinity of the outer side 35 and the even-numbered folding. The inner surfaces of the joint plate 141 near the outer edge 142 are continuously heat-sealed from the side 33 of the odd-numbered side plate 12 to the side 43 of the even-numbered side plate 14.

By doing so, the notch 132 on the outer edge side of the blank 10 of the odd-numbered fold-in joint plate 121 in the odd-numbered fold-in joint plate 121 and the even-number fold-in joint plate 141, and the said It is possible to prevent the contents from leaking through the outer edge 142 of the even-numbered folding joint plate 141.

Next, in a state where the odd-numbered folding joint plate 121 and the even-numbered folding joint plate 141 are overlapped by heat sealing, the even-numbered folding joint plate 141 is placed on the outer surface side of the even-numbered side plate 14. It is bent toward the even-numbered side plate 14 so as to face each other. The odd-numbered edge piece 13, the even-numbered edge piece 15, and the joint edge piece 122 are each valley-folded, and the heat-sealed odd-numbered folding joint plate 121 and the even-numbered folding joint plate 141 are formed. Overlay on the even-numbered side plate 14.

Then, the upper surface of the joint edge piece 122 and the lower surface of the even-numbered edge piece 15 come to face each other, and the upper surface of the joint edge piece 122 and the lower surface of the even-numbered edge piece 15 are heat-sealed. To. Further, by bending the odd-numbered side plate 12 and the even-numbered side plate 14 so that the side surfaces of the odd-numbered side plates are aligned with each other, the upper surface of the end 131 of the odd-numbered edge piece 13 and the even number are formed. The lower surfaces of the end 151 of the even-numbered edge piece 15 face each other, and the upper surface of the end 131 of the odd-numbered edge piece 13 and the lower surface of the end 151 of the even-numbered edge piece 15 are heat-sealed.

In the method of assembling the flanged paper container 50 described above, each portion has a joining step. As a layer structure of the laminated body of the blank 10, heat sealing is desirable as a joining method when thermoplastic resin layers are provided on both the front and back surfaces. The heat-sealing method may be appropriately selected from a method of blowing hot air to pressurize, a method of pressing a high-temperature heater bar, an ultrasonic welding method, a high-frequency welding method, a method of heating and pressurizing with infrared rays, and other known methods. Be selected.

Further, the laminated body of the blank 10 may be provided with a thermoplastic resin layer on one side without providing a thermoplastic resin layer on both sides. Although it is a surface on which the thermoplastic resin layer is provided, it may be provided on the inner surface of the flanged paper container 50 or on the outer surface. If the main purpose is to prevent exudation of the contents, it may be provided on the inner surface, and if the main purpose is to prevent exudation from the outside or dew condensation on the outer surface of the container, it may be provided on the outer surface.

When a thermoplastic resin layer is provided on one side, the bonding interface may be a combination of a paper base material layer and a thermoplastic resin layer. In this case, depending on the material of the thermoplastic resin layer, it can be bonded as it is without treatment. In some cases, if it cannot be bonded without treatment, surface treatment to the paper substrate layer or bonding using an adhesive is performed. Further, the portion where the bonding interface is formed between the paper base material layers can be bonded by using an adhesive. If the requirement for the tightness of the paper container is low and the contribution to the shape retention is low, the paper container may be unbonded.

When the thermoplastic resin layer is not used on both sides, all the bonding interfaces are a combination of layers that cannot be heat-welded. Therefore, surface treatment to each surface layer or bonding using an adhesive is performed.

Since the configuration of the blank shape of the hexagonal flanged paper container and the octagonal flanged paper container is the same as that of the rectangular flanged paper container described above, the description thereof is omitted.
The material and manufacturing method of the blank of the hexagonal flanged paper container and the octagonal flanged paper container are the same as those of the rectangular flanged paper container described above, so the description thereof will be omitted.
Further, the method of assembling the hexagonal flanged paper container and the octagonal flanged paper container is the same as the case of the rectangular flanged paper container described above, so the description thereof is omitted.
The same applies to a paper container with a flange having an even polygonal shape of a decagon or more, so the description is omitted.

As described above, since the flanged paper container of the present invention does not cause a through hole in the flange, the content does not leak from the through hole of the flange when the content is filled and the lid material is sealed. It is possible to provide a paper container with a flange having excellent hermeticity.

The flanged paper container of the present invention is used for packaging instant noodles, udon noodles, pasta, gratin, various bowls, chilled foods, frozen foods, cold confectionery, confectionery and other foods, and non-food items such as fragrances, detergents, waxes and hairdressers. It can be applied to a paper container with a flange which has an outward flange integrally with an upper opening edge so that a lid material can be attached.

10 Blank 11 Bottom plate 12 Odd-numbered side plate 121 Odd-numbered folding joint plate 122 Joint edge piece 123 Sealing part 124 Outer edge of joint edge piece 125 Separate sealing part 13 Odd-numbered edge piece 131 Odd-numbered edge piece end 132 Notch 133 Branching notch 14 Even-numbered side plate 141 Even-numbered folding joint plate 142 Outer edge of even-numbered folding joint plate 15 Even-numbered edge piece 151 Even-numbered edge piece end 152 Even-numbered edge piece Outer edge of the end 31 Odd-numbered bottom plate side 32 Outer side of odd-numbered side plate 33 Side side of odd-numbered side plate 34 Side side of odd-numbered folding joint plate (opposite side of odd-numbered side plate)
35 Outer side of odd-numbered folding joint plate 41 Side side of even-numbered bottom plate 42 Outer side of even-numbered side plate 43 Side side of even-numbered side plate 44 Side side of even-numbered folding joint plate (even-numbered Opposite side plate)
50 Paper container with flange 51 Body 52 Flange 60 Conventional blank 61 Bottom plate 62 First side plate 621 First folding joint plate 622 Joint edge piece

63 1st edge piece 631 1st tongue piece 64 2nd side plate 641 2nd folding joint plate 65 2nd edge piece 651 2nd tongue piece 66 Projection piece 71 Bottom plate 1st side side 72 1st side plate outer side 73 1 Side plate side side 74 First folding joint plate side side (opposite side to the first side plate)
75 1st folding joint plate outer side 81 Bottom plate 2nd side side 82 2nd side plate outer side 83 2nd side plate side side 84 2nd folding joint plate side side (opposite side to the 2nd side plate)
90 Paper container with flange 91 Body 92 Flange

A Odd-numbered side plate assembly point B Even-numbered side plate assembly point C Termination near the odd-numbered side plate of the cut D Termination near the odd-numbered side plate of the branching cut E Bending of the notch Point F Cut branch point L First side plate assembly point M Second side plate assembly point

r Distance from meeting point A θ Magnitude of internal angle of bottom plate α Bending angle of side side of odd-numbered side plate

Claims (9)

In blanks for flanged paper containers
The blank includes an n-sided (polygonal shape, n is an even number of 4 or more) bottom plate having 4 or more even numbered corners.
One of the n sides of the bottom plate is designated as the side of the first bottom plate, and the side of the bottom plate adjacent to one direction of the side of the first bottom plate is designated as the side of the second bottom plate. , And then sequentially, from the third bottom plate side to the nth bottom plate side.
An odd-numbered side plate is continuously provided on each of the odd-numbered bottom plate side sides via a mountain fold line, and an even-numbered side plate is provided on each of the even-numbered bottom plate side sides via a mountain fold line. Serialized,
One of the odd-numbered fold-in joint plates having an inverted triangular shape with respect to the corners of the bottom plate via mountain fold lines on each of the side sides of the odd-numbered side plate located on both sides in the circumferential direction of the blank. With the sides of
One of the even-numbered folding joint plates having an inverted triangular shape with respect to the corners of the bottom plate via valley fold lines on each of the side sides of the even-numbered side plates located on both sides in the circumferential direction of the blank. With the sides of
The other side of each of the odd-numbered folding joint plates arranged in the circumferential direction of the blank and the other side of each of the even-numbered folding joint plates arranged in the circumferential direction of the blank. And form a common side that becomes a mountain fold line,
A joint edge piece is continuously provided on the outer edge of each of the odd-numbered folding joint plates on the side to be the edge of the flanged paper container via a valley fold line.
On the outer side of each of the odd-numbered side plates on the side to be the edge of the flanged paper container, odd-numbered edge pieces are continuously provided via a valley fold line.
The ends of each of the odd-numbered edge pieces extending from both ends in the direction along the edge of the flanged paper container are connected to the joint edge piece through a notch.
An even-numbered edge piece is continuously provided on the outer side of each of the even-numbered side plates on the side to be the edge of the flanged paper container via a valley fold line.
Each of the even-numbered edge pieces is provided with an end extending from both ends in a direction along the edge of the flanged paper container.
Each portion of the notch is bent at intervals with respect to the outer edge of the odd-numbered fold-in joint plate, and between the bent portion of the notch and the outer edge of the odd-numbered fold-in joint plate. A blank for flanged paper containers, characterized by having a seal. The blank for a flanged paper container according to claim 1, wherein the width of the sealing portion between the notch and the outer edge of the folding joint plate is 0.5 mm or more and 3 mm or less. The end portion of the notch closer to the odd-numbered side plate is at a position where it touches or intersects the side side of the odd-numbered side plate or an extension line of the side side to the edge side of the flanged paper container. Or, the blank for a paper container with a flange according to claim 1 or 2, wherein the position is immediately before contact. The flanged portion according to any one of claims 1 to 3, wherein the end portion of the notch closer to the odd-numbered side plate is bent in the outward direction of the flanged paper container. Blank for paper containers. The end portion of the notch closer to the odd-th side plate is the side side of the odd-th side plate, or the extension line of the side side to the edge side of the flanged paper container of the joint edge piece. From claim 1, the flanged paper container is bent inward at a bending point separated from the direction, and is in contact with or intersects with the outer side of the odd-th folding joint plate, or is at a position immediately before the contact. The blank for the flanged paper container according to any one of up to 4. The distance between the end of the notch closer to the odd-numbered side plate and the side side of the odd-numbered side plate or the extension line of the side side to the edge side of the flanged paper container is The blank for a paper container with a flange according to any one of claims 1 to 5, wherein the blank is 0.5 mm or more and 5 mm or less. The branch is provided with a notch that branches from the position of the end portion of the notch closer to the odd-numbered side plate toward the odd-numbered fold-in joint plate from a branch point that has returned to the opposite side along the notch. The flanged paper according to any one of claims 1 to 6, wherein the end portion of the notch is at a position where it contacts or intersects with the outer edge of the odd-numbered folding joint plate, or a position immediately before the contact. Blank for containers. The distance between the position of the branch point of the branching notch and the side side of the odd-th side plate or the extension line of the side side to the edge side of the flanged paper container is 1 mm or more and 5 mm or less. The blank for a paper container with a flange according to claim 7. A flanged paper container formed by assembling a blank for the flanged paper container according to any one of claims 1 to 8.

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