JP2000094504A - Foamed synthetic resin container, molding apparatus and molding method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foamed synthetic resin container in which a lid member can be easily separated and a foamed synthetic resin container in which the lid member can be combined with the container body without substantially any gap. SOLUTION: A container body 2 and a cover member 3 integrally formed by using a foamed synthetic resin sheet material are provided, and the cover member 3 is rotated around a boundary 4 between the container body 2 and the cover member 3. In the foamed synthetic resin container 1 in which the opening of the container body 2 can be closed by the lid member 3, a plurality of perforated holes 13a penetrating the front and back of the boundary portion 4 are arranged in series at intervals. At least two perforations 13 were formed substantially in parallel along the length direction of the boundary portion 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed synthetic resin container suitable for containing food such as natto.

[0002]

2. Description of the Related Art As a container suitable for storing food such as natto, a container body and a lid member integrally formed using a foamed synthetic resin sheet material such as a polystyrene foam (PSP) sheet are provided. 2. Description of the Related Art A foamed synthetic resin container in which an opening of a container body can be closed by a lid member by rotating the lid member around a boundary portion between the lid and the lid member has been widely put to practical use. However, in this type of container, when the container is placed on a table or the like in a state where the lid member is open, the lid member moves sideways from the container body because the lid member and the container body are integrated. Since it protrudes, there is a problem that the lid member hinders the removal of the contents and the appearance is not good.

Therefore, Japanese Utility Model Publication No. 57-45144 and Japanese Utility Model Publication No. 59-40252 disclose a single groove 103 at a boundary 102 between a container body 100 and a lid member 101 as shown in FIG. Formed along the length direction, the groove 10
A perforation 104 is formed in the valley of No. 3 and this perforation 10
A foam synthetic resin container configured so that the lid member 101 can be separated from the container body 100 along the line 4 is disclosed.
Japanese Patent Application Laid-Open No. Hei 9-136353 discloses, as shown in FIG. 9, a boundary portion 11 between a container body 110 and a lid member 111.
2 is formed as a thin wall as a whole, and the boundary portion 112 is bent in a wave shape to form two substantially parallel grooves 113 and a ridge 114, and the ridge 114 has a saw blade shape from the outer surface side. It describes that a perforation 115 is formed by inserting a blade body. Further, this publication discloses that perforations 116 are also formed in the valleys of the two grooves 113, respectively. However, this perforation 116 forms a convex line parallel to the male jig, forms notches at regular intervals along the ridge line of the convex line, and forms a female flat portion other than the notch. Unlike the perforation 115 formed by the blade body, the perforation 116 is formed by pressing against the portion, but the perforations 116 are formed at regular intervals, but have penetrating holes. There is no. For this reason, although three perforations are formed in this container, the perforations 116 on both sides are
It works effectively when closing the lid member 111, but because of the high bonding strength, when separating the lid member 111,
Basically, it is cut along one central perforation 115.

[0004] On the other hand, in a filling line for filling the contents of these containers, the containers are piled up, for example, about 1 m and stocked, with the container body opened, and the contents are sequentially filled and then transferred to a conveyor. The container is placed on the conveyor, the lid member is held and rotated, and the opening of the container body is closed. In the filling line, a series of operations of stacking the containers, transferring the containers to the conveyor, and closing the container main body are preferably performed in a state where the lid member is extended substantially horizontally to the side from the container main body. The reason is that if the lid member of the container is sagging downward on the free end side or warped upward on the free end side, when stacking containers, the balance of the stacked containers becomes poor or the number of stacked containers decreases. Also, when transferring to the conveyor, the lid member may be caught and cannot be transferred smoothly, and when the container body is closed, the lid member may not be held well.

[0005]

If a perforation is formed at the boundary between the lid member and the container body as described in the above-mentioned publication, the separation of the lid member becomes much easier. When the connection part of the perforation is located, it may tear from the part other than the perforation when separating the lid member,
In some cases, the lid member becomes difficult to separate, or the appearance of the separated portion may deteriorate.

Further, in the container described in Japanese Utility Model Publication No. 57-45144 or Japanese Utility Model Publication No. 59-40252, as shown in FIG. Moves to both sides of the groove 103, and the groove 10
3, bulging portions 105 are formed on both sides of the cover member 10.
8, when the bulging portions 105 are pressed against each other, the lid member 101 is difficult to close.
As shown in (b), the perforation 104 is damaged by an excessive force acting on the perforation 104, or the gap 106 is formed between the lid 101 and the container body 100 by bending the lid 101. was there. Further, Japanese Patent Application Laid-Open No. Hei 9-1363
In the container described in JP-A-53-53, as shown in FIG. 9A, since the bulging portion 117 is formed outside the two grooves 113, the lid member 111 is closed similarly to the container. At this time, as shown in FIG. 9A, the bulging portions 117 are pressed against each other, so that the lid member 111 is difficult to close, and if forcibly closed, a gap 119 is formed between the lid member 111 and the container body 110. There's a problem.

Further, as the cause of the sagging or warping of the lid member as described above, the influence of the pressure and the heating temperature at the time of molding may be considered. It is difficult to uniformly adjust the pressure and the heating temperature of the entire mold, and in fact, sagging and warpage occur in a few containers. Such a phenomenon is also a problem in the container described in the above publication. The present applicant has changed the configuration at the boundary between the container body and the lid member, and has found that although the mechanism is unknown, sagging and warping of the lid member can be effectively prevented.

[0008] It is an object of the present invention to provide a foamed synthetic resin container in which the lid member can be easily separated and a foamed synthetic resin container in which the lid member can be combined with the container body with almost no gap.

[0009]

According to a first aspect of the present invention, there is provided a foamed synthetic resin container having a container body and a lid member integrally formed using a foamed synthetic resin sheet material, and a boundary between the container body and the lid member. In the foamed synthetic resin container in which the opening of the container main body can be closed by the lid member by rotating the lid member around the center, the perforated holes penetrating the front and back at the boundary portion are formed in series with a gap. And at least two perforations formed substantially parallel to each other along the length direction of the boundary portion.

[0010] In this foamed synthetic resin container, when filling the container body with the contents, the container body is filled with the contents while the opening of the container body is opened, and then the lid member is closed at least two times. By turning around the perforation of the book, the opening of the container body is closed by the lid member. Also, when removing the contents from the container body, the lid member is rotated around the perforation to open the container body, and the contents are removed, but at this time, if the lid member is in the way, The lid member is separated from the container body along the perforations. By the way, in this container, since a perforation formed by arranging a plurality of perforated holes penetrating the front and back sides at a boundary portion in series at intervals is formed, the lid member can be easily formed along the perforation. And it can be cut off neatly. Moreover, since at least two perforations are formed substantially in parallel, even if one of the perforations is not sufficiently formed, the cover member can be placed along the other perforation. It is possible to be surely separated.

A container according to a second aspect of the present invention is the container according to the first aspect, wherein at least two perforation holes are arranged in a staggered manner. With this configuration, at least one perforation end is always provided with a perforation hole, and when the lid member is separated, the lid member can be separated using the perforation hole located at the end as a cut. Become. For this reason, the detaching operation of the cover member is facilitated, and the detachment can be performed neatly, so that the appearance of the detached portion also improves.

According to a third aspect of the present invention, in the container according to the first or second aspect, at least two bottles are formed in the boundary portion by depressing an inner side facing inward with the lid member turned in the closing direction. Are formed substantially in parallel along the length direction of the boundary portion, and perforations are formed in the valleys of at least two of the grooves. When the thickness of the foamed synthetic resin container is increased, when the lid member is closed, a large compressive force acts on the inner surface side of the boundary portion, and a large tensile force acts on the outer surface side, and the boundary portion is damaged, Since the operability of the lid member is reduced, by configuring as described in claim 3,
By making the thickness of the bent portion thin, it is possible to prevent breakage of the boundary portion and to set the operability of opening and closing the lid member satisfactorily.

A container according to a fourth aspect of the present invention is the container according to the third aspect, wherein a thick ridge having an angled cross section is formed between the at least two grooves. When filling the container body with the contents, it is preferable to arrange the lid member so as to extend substantially horizontally to the side from the container body so as not to hinder the filling operation. In the container according to the fourth aspect of the present invention, since a thick ridge having an angled cross section is formed between at least two ridges, buckling of the sheet material cells is prevented at the ridge, and the ridge is formed. Compared with a conventional container having a thin portion, the tension force remaining on the inner surface side and the outer surface side of the boundary portion is balanced, and the lid member is easily kept horizontal.

According to a fifth aspect of the present invention, in the container according to the third or fourth aspect, a buckling restricting portion is formed at the valley portion of the groove so as to protrude inward and outward. With this configuration, the buckling of the cells of the sheet material at the valleys of the groove is regulated, and the tensile force remaining on the inner surface side and the outer surface side of the boundary is balanced, so that the lid member can be easily kept horizontal.

A container according to a sixth aspect of the present invention is the container according to any one of the third to fifth aspects, wherein the inner surface is stepped down in the thickness direction outside the at least two grooves. Are formed along the groove. In this container, since an adjusting portion formed by stepping down the inner surface in the thickness direction is formed outside at least two grooves, it is possible to prevent a bulging portion from being formed outside the grooves. When the lid member is closed, excessive force acts on the boundary,
The formation of a gap between the container body and the lid member can be effectively prevented.

The container according to claim 7 has a container body and a lid member integrally formed using a foamed synthetic resin sheet material,
In a foamed synthetic resin container in which the lid member is rotated around a boundary between the container body and the lid member so that the opening of the container body can be closed with the lid member, the lid member is closed at the boundary in the closing direction. Depress the inner surface side facing inward while turning it to
At least two grooves are formed substantially in parallel along the length direction of the boundary portion, and an adjusting portion formed by stepping down the inner surface side in the thickness direction outside the at least two grooves is formed in the groove. It is formed along. In this foam synthetic resin container,
In the same manner as in claim 6, the bulging portion is prevented from being formed outside the groove by the adjusting portion, and in a state where the lid member is closed, an excessive force acts on the boundary portion or the container body and The formation of a gap between the lid members can be effectively prevented.

According to an eighth aspect of the present invention, there is provided an apparatus for molding a foamed synthetic resin container, wherein a foamed synthetic resin container having a container body and a lid member rotatably connected at a boundary is integrally formed using a foamed synthetic resin sheet material. A molding apparatus for a foamed synthetic resin container having a pair of molding dies for forming at least two substantially parallel perforations extending along the length direction of the boundary portion in the one molding die. And a receiving portion for receiving the blade inserted through the foamed synthetic resin sheet material in the other mold. In this molding apparatus, the perforation hole can be reliably formed in the foam synthetic resin sheet material in a penetrating shape by the blade body and the receiving portion. The lid member can be easily and neatly cut along the perforations.

According to a ninth aspect of the present invention, in the molding apparatus of the eighth aspect, at least two blades are formed at regular intervals on each of the at least two blades to form the perforations.
In at least two blades, the positions of the blades are shifted in the length direction of the boundary portion and are arranged in a staggered manner. The container as described in claim 2 can be manufactured by the molding device having such a configuration.

A molding apparatus according to a tenth aspect is the molding apparatus according to the eighth or ninth aspect, wherein the blade body has a rectangular wave shape on one side and a blade provided at an end thereof. It is. Such a blade body is preferable as compared with a blade body having a saw blade, since the length of the perforated hole formed in the perforation can be set with higher accuracy, and the blade edge does not pierce the receiving plate.

[0020] The molding apparatus according to the eleventh aspect is characterized in that:
11. The molding device according to claim 10, wherein a groove for receiving a blade is formed as the receiving portion. In this forming apparatus, a perforation is formed by inserting the blade into the concave groove through the sheet material.

[0021] The molding apparatus according to the twelfth aspect is characterized in that:
11. The molding device according to any one of claims 10, wherein the receiving portion is a receiving plate for receiving a blade, the receiving plate being separate from the other forming die. With this configuration, if the receiving plate is damaged by receiving the blade, the receiving plate can be replaced with a new one, which is preferable in performing maintenance and inspection.

According to a thirteenth aspect of the present invention, there is provided a molding apparatus.
In the above described molding apparatus, the receiving plate is made of polypropylene. A receiving plate made of such a material is preferable because wear of the cutting edge can be prevented and durability of the blade can be improved, and even if the receiving plate is damaged by contact with the blade, it hardly peels off.

The molding apparatus according to the fourteenth aspect is characterized in that the molding apparatus according to the ninth aspect
13. The molding apparatus according to any one of the above 13, wherein at least two grooves are formed substantially parallel to a portion of the one mold that forms a boundary portion along a length direction of the boundary portion. A pressing portion for forming an adjusting portion formed by stepping down the inner surface side of the boundary portion in the thickness direction outside the at least two ridges is provided along the ridge. It was formed. The container as described in claim 6 can be manufactured by the molding apparatus having such a configuration.

According to a fifteenth aspect of the present invention, there is provided an apparatus for molding a foamed synthetic resin container, wherein a foamed synthetic resin container having a container body and a lid member rotatably connected at a boundary is integrally formed using a foamed synthetic resin sheet material. In a molding apparatus for a foamed synthetic resin container having a set of molding dies, a part of one of the molding dies which forms a boundary portion faces inward while the lid member is rotated in the closing direction. At least two ridges for forming at least two ridges formed by recessing the inner surface side substantially in parallel along the length direction of the boundary portion are provided, and outside the at least two ridges, A pressing portion is formed along a ridge to form an adjustment portion formed by stepping down the inner surface side of the boundary portion in the thickness direction. A container as described in claim 7 can be manufactured by the molding apparatus having such a configuration.

According to a sixteenth aspect of the present invention, there is provided a method for molding a foamed synthetic resin container, wherein the foamed synthetic resin sheet material is set between both molds using the molding apparatus according to any one of the eighth to fourteenth aspects. By closing both molds, the container body and the lid member are formed, and at the same time, the blade edges are inserted into the foamed synthetic resin sheet material until at least two blades of the blade body come into contact with the receiving plate. At least two perforations are formed at the boundary between the members. In this molding method, the cutting edge is inserted into the foamed synthetic resin sheet material until the cutting edge of the blade body comes into contact with the receiving plate, so that at least two perforations in which the perforated holes are securely and neatly formed are formed. It becomes possible. Also, at least two such
The container in which the perforations of the book are formed can easily and neatly separate the lid member along the perforations as described in claim 1, and in the event that one of the perforation holes is formed, Even if the through-hole is not formed sufficiently, the lid member can be reliably separated along the other perforation.

According to a seventeenth aspect of the present invention, there is provided a method for molding a foamed synthetic resin container, wherein a foamed synthetic resin sheet material is set between both molds using the molding apparatus according to the fourteenth or fifteenth aspect.
By closing both molds, the container body and the lid member are formed, and at the boundary between the container body and the lid member,
At least two grooves are formed by at least two convex lines, and the foamed synthetic resin sheet material is pressed by the pressing portion, and the inner surface side of the boundary is formed in the thickness direction outside the at least two grooves. This is for forming an adjusting portion formed by stepping down. In this forming method, when forming a groove with at least two convex lines, excess meat moves to the outside of the at least two grooves, and the outer portion of the groove tends to swell. Since the adjustment portion is formed by pressing the portion by the pressing portion and stepping down in the thickness direction, the expansion is reliably prevented. For this reason, similarly to the container according to claim 6 or 7, when the lid member is closed, an excessive force acts on the boundary portion or a gap is formed between the container body and the lid member. Can be effectively prevented.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the foamed synthetic resin container 1 has a container body 2 and a lid member 3 integrally formed using a foamed synthetic resin sheet material, and the lid member 3 defines a boundary portion 4 therebetween. The cover member 3 is pivotally connected to the container main body 2 at the center, and the cover
It is configured so that it can be rotated by 0 ° to close the opening of the container body 2.

At the center of the container body 2 is formed a housing portion 5 having an open upper surface for housing the contents, and at the upper end portion of the housing portion 5 is formed a flange 6 extending outward and substantially horizontally. The boundary portion 4 is provided continuously to one side of the flange portion 6. This container 1 is a container 1 for natto, and as shown in FIG.
The wall of the container 5 of the container body 2 is formed in an uneven shape so that the soybeans filled in the container 5 can be well ventilated to promote the propagation of Bacillus natto. When storing foods and other foods other than the above, the inner surface of the storage unit 5 may be configured as a substantially flat surface. In addition, the shape and size of the storage section 5 can be arbitrarily set according to the shape of the contents to be filled, the usage form thereof, and the like.

A flange 7 is formed on the outer peripheral portion of the lid member 3 so as to overlap with the flange 6 of the container body 2 in a closed state, and the boundary portion 4 is provided so as to be continuous with one side of the flange 7. I have. A fitting projection 8 is formed on the inner side of the flange 7 so as to protrude upward, and the lid member 3 is fitted to the container main body 2 by fitting the fitting projection 8 into a portion near the outer periphery of the housing portion 5. Positioned. However, the shape and size of the lid member 3 can be arbitrarily set according to the shape and size of the container body 2. Further, the fitting projection 8 may be omitted.

The boundary 4 for connecting the lid member 3 to the container body 2 so as to be openable and closable is constituted as follows. As shown in FIGS. 1 to 4, the boundary member 4 includes a lid member 3.
Are turned in the closing direction, and two groove grooves 10 are formed substantially in parallel with the inner surface side facing inwardly recessed.
A thick ridge 11 having a chevron-shaped cross section is formed between zeros.
At each valley of the two grooves 10, a substantially columnar buckling restricting portion 12 projecting to the inner surface side and the outer surface side is formed, and the valley of the groove 10 extends through the buckling restricting portion 12. A perforation 13 is formed, and the lid member 3 can be separated from the container body 2 along the perforation 13.

The perforated hole 13a of the perforation 13 and the connecting portion 13
b are alternately formed at regular intervals. Drilled hole 1
The length L1 of 3a is set to be four to six times the length L2 of the connecting portion 13b, and is configured so that the lid member 3 can be easily separated along the perforations 13. For example, when the length L1 of the perforated hole 13a is set to 5 mm, the length L2 of the connecting portion 13b is set to 1 mm. The two perforations 13 are arranged in a staggered manner with the formation positions of the perforations 13a shifted by about half a pitch in the length direction of the perforations 13, and at least one perforation 13 has a perforation hole 13a at the end thereof. It is configured to be located. That is, the cover member 3 is configured to be easily separated using the perforated hole 13a located at the end as a cut.

When the lid member 3 extends substantially horizontally to the side from the container body 2, the angle θ formed by the inclined surface of the groove 10 is 9
0 ° or more, preferably 90 to 120 °, and FIG.
Even if the lid member 3 is closed as shown in FIG.
It is arranged with a slight gap in the space formed by the groove 10 of the book, and is configured so that a compressive force does not act on the ridge 11. Further, the height of the ridge 11 is set to be substantially the same as the thickness of the flanges 6 and 7, and buckling of the cell in the ridge 11 is prevented.

The distance between the two perforations 13 is set substantially equal to the sum of the plate thicknesses of the flanges 6 and 7 of the container body 2 and the plate thicknesses of the flanges 6 and 7 of the lid member 3. In the present embodiment, since the plate thicknesses of both the flange portions 6 and 7 are set to be the same, the plate thickness of one of the flange portions 6 and 7 is set to be twice as large. That is,
As shown in FIG. 4B, the lid member 3 has two perforations 1.
3 and is assembled with the container body 2
By setting the distance between the two perforations 13 to twice the thickness of the flanges 6 and 7, the flanges 6 and 7 can be overlapped with almost no gap. Outside the two grooves 10 on the inner surface side of the boundary 4, an adjusting portion 14 is formed along the groove 10 by stepping down the inner surface in the thickness direction. It is configured such that the outside of the groove 10 is prevented from swelling at the time of molding 1, and the lid members 3 can be closed by overlapping the flange portions 6 and 7 with almost no gap. Note that three or more grooves 10 and perforations 13 can be formed with respect to the boundary portion 4.

Next, the configuration of the core mold 20 and the cavity mold 30 for molding the container 1 will be described. FIG.
As shown in the figure, forming portions 21 and 22 for forming the inner surfaces of the container body 2 and the cover member 3 are provided on the left and right portions of the core mold 20.
Are formed on the left and right portions of the cavity mold 30 to form the outer surfaces of the container body 2 and the lid member 3,
32 are formed. Molding parts 21 and 22 of core mold 20
An upper molding block 23 for molding an inner surface portion of the boundary portion 4 is exchangeably assembled therebetween, and a cavity mold 30 is formed.
A lower forming block 33 for forming the inner surface of the boundary portion 4 is exchangeably assembled between the forming portions 31 and 32.

As shown in FIGS. 6 and 7, two convex strips 24 are formed on the lower surface of the upper molding block 23, and project downward from the approximate center of the two convex strips 24 in the width direction. Blade body 25
Are provided, and the lower end of the blade body 25 is formed in a rectangular wave shape, and the blades 25a are formed at the lower end of the blade body 25 at regular intervals. However, the lower end of the blade body 25 may be formed in a saw blade shape, and a blade may be formed at the lower end of the blade body. A flat pressing portion 26 is formed on the lower surface of the upper forming block 23 outside the two ridges 24, and the upper forming block 23 is assembled such that the pressing portion 26 projects slightly downward from the core mold 20, The adjusting portion 14 is formed by the pressing portion 26.

Two grooves 34 are formed on the upper surface of the lower forming block 33 so as to face the blade body 25.
The depth of the blade body 25 and the amount of protrusion of the blade body 25 are determined by forming a concave groove 34 so that the blade body 25 penetrates the foam sheet in a state in which the molds 20 and 30 are clamped. Is set to a depth that makes contact with the bottom surface of the concave groove 34 without any gap, so that the perforated hole 13a of the perforation 13 is reliably formed. In order to prevent the blade body 25 from being worn or damaged,
A receiving plate 35 is provided on the bottom surface of 4. Receiving plate 35
Although various materials such as a soft metal material and a synthetic resin material can be used as the material, it is preferable to use a polypropylene receiving plate because it is available at low cost and has excellent durability. The width of the groove 34 is set to be larger than the thickness of the tip of the ridge 24, and a relatively large space is formed between the groove 34 and the ridge 24, in which the buckling restricting portion 12 is formed. Thus, the cells of the synthetic resin sheet material constituting the buckling control section 12 are configured so as not to buckle.

When the container 1 is molded by using the molding dies 20, 30, a heat-softened synthetic resin sheet material (not shown) is set on the opened cavity mold 30, and then vacuum suction is performed. The sheet material is formed by the cavity mold 30
Then, the molds are clamped, and the molds 20 and 30 are heated to the set temperature to obtain the container 1. By the way, in a state where the sheet material is brought into close contact with the cavity mold 30 by vacuum suction, the sheet material is disposed so as to close the concave groove 34, and at the time of mold clamping, the ridge 24 and the blade 25a are pressed against the sheet material, A groove 10, a buckling control portion 12, and a perforation 13 are formed in the sheet material.

In the container 1 thus formed, a thick ridge 11 having a thick mountain-shaped cross section is formed between the two grooves 10, and the valleys of the two grooves 10 form the cells. Since the buckling restraining portion 12 in which buckling is suppressed is formed, and the balance of the tensile force remaining on the inner surface side and the outer surface side of the boundary portion 4 is improved, the molded container 1 is, as shown in FIG. The lid member 3 is supported in a cantilever shape extending substantially horizontally to the side from the container body 2. Therefore, when a plurality of containers 1 are stacked and stocked, the containers 1 can be stably and neatly stacked, and when the contents are filled in the storage unit 5, the containers 1 need to be conveyed. Smoothness and easy handling of the lid member 3 are also facilitated. Note that the lower mold block 33 may be provided in the core mold 20 and the upper mold block 23 may be provided in the cavity mold 30. When three or more grooves 10 and perforations 13 are formed, the number of the ridges 24 and the grooves 34 is increased accordingly, and
5 will be increased.

[0039]

According to the foamed synthetic resin container of the first aspect, the lid member can be easily separated along the perforation.
When taking out the contents, it is possible to prevent the lid member from getting in the way or to reduce the appearance. In addition, even if the perforation hole of one perforation is not sufficiently formed, the lid member can be reliably separated along the other perforation. When at least two perforation holes are arranged in a staggered manner as described in claim 2,
A perforation hole is always located at at least one end of the perforation, and when the lid member is cut off, the lid member can be cut off using the perforation hole located at the end as a cut, so that the lid member can be cut off. Separation work is facilitated, and since it can be neatly separated, the appearance of the separated portion is also improved.

According to a third aspect of the present invention, the inner surface side facing inward is depressed in a state where the lid member is rotated in the closing direction at the boundary portion, and at least two grooves are formed in the longitudinal direction of the boundary portion. When the perforations are respectively formed in the valleys of the at least two grooves, the thickness of the bent portion can be reduced to prevent the boundary portion from being damaged, and to prevent the boundary member from being damaged. Operability can be improved.

According to a fourth aspect of the present invention, when a thick ridge having an angled cross section is formed between at least two grooves, the tensile force remaining on the inner surface and the outer surface of the boundary portion during molding of the container is reduced. By balancing, the lid member can be prevented from sagging or warping, and the container can be smoothly filled with contents. When the buckling restricting portions projecting to the inner surface side and the outer surface side are formed in the valleys of the grooves, the buckling of the cells in the valleys of the grooves is restricted during the molding of the container. By balancing the tensile force remaining on the inner surface side and the outer surface side of the portion, sagging and warping of the lid member can be more effectively prevented.

According to a sixth aspect of the present invention, when an adjusting portion formed by stepping down the inner surface in the thickness direction is formed along the groove outside the at least two grooves, the protrusion protrudes outside the groove. It is possible to prevent a portion from being formed, and in a state where the lid member is closed, it is possible to effectively prevent an excessive force from acting on the boundary portion or to form a gap between the container body and the lid member. According to the foamed synthetic resin container according to claim 7, the lid member is rotated around at least two grooves formed at the boundary portion,
Although the opening of the container body is opened and closed, an adjusting portion formed by stepping down the inner surface side in the thickness direction is formed outside the at least two grooves, so that it expands outside the grooves. The protrusion can be prevented from being formed, and in a state where the lid member is closed, it is possible to effectively prevent an excessive force from acting on the boundary portion and a gap from being formed between the container body and the lid member.

According to the foaming synthetic resin container molding apparatus according to the eighth aspect, the perforation hole can be reliably formed in the foaming synthetic resin sheet material so as to be penetrated by the blade body and the receiving portion. As in the case of the container according to the first aspect, the lid member can be easily and cleanly separated from the container body along the perforations. As described in claim 9, blades are formed at regular intervals on at least two blade bodies to form perforations, and the positions of the blades in at least two blade bodies are shifted in the length direction of the boundary portion. When arranged in a staggered manner, a container as described in claim 2 can be manufactured.

According to a tenth aspect of the present invention, when a blade body having a rectangular wave shape on one side and a blade provided at an end thereof is used, a sewing machine has a larger blade than a blade body having a saw blade. This is preferable because the length of the perforation hole formed in the eye can be accurately set, and the blade edge does not pierce the receiving plate. Claim 1
As described in 1, when a concave groove for receiving the blade is formed as the receiving portion, the blade penetrates the sheet material and is inserted into the concave groove, so that a perforation is formed. And the durability of the blade body can be improved.

According to a twelfth aspect, as the receiving portion,
If a receiving plate for receiving the blade is provided separately from the other mold, if the receiving plate is damaged by receiving the blade, the receiving plate can be replaced with a new one. It is preferable for performing maintenance and inspection. Claim 1
As described in 3, the receiving plate is preferably formed of polypropylene because wear of the cutting edge can be suppressed and durability can be improved, and even if the receiving plate is damaged by contact with the blade, it is hardly peeled off. According to the molding device according to claims 14 and 15, the containers according to claims 6 and 7 can be respectively manufactured.

According to the method of molding a foamed synthetic resin container of the present invention, the cutting edge is inserted into the foamed synthetic resin sheet until the cutting edge of the blade comes into contact with the receiving plate. It is possible to form at least two perforations penetrating through the holes. Further, in the container in which at least two perforations are formed, the lid member can be easily and cleanly cut along the perforations as described in claim 1, and in the unlikely event that one of the lid members is cut off. Even when the perforation hole is not sufficiently formed, the lid member can be reliably separated along the other perforation.

According to the method of molding a foamed synthetic resin container according to the seventeenth aspect, when the groove is formed by at least two ridges, excess meat moves outside the at least two grooves. Although the outer portion of the groove tends to swell, the adjusting portion is formed by pressing the portion by the pressing portion and stepping down in the thickness direction, so that the swelling is reliably prevented. For this reason, similarly to the container according to claim 6 or 7, when the lid member is closed, an excessive force acts on the boundary portion or a gap is formed between the container body and the lid member. Can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a foamed synthetic resin container of the present invention.

FIG. 2 is a front view of the container.

FIG. 3 is a plan view of a main part of the container.

FIG. 4 is an explanatory view near the boundary of the container.

FIG. 5 is a longitudinal sectional view of a mold for molding the container.

FIG. 6 is a vertical cross-sectional view showing the vicinity of a forming block forming a boundary portion of the forming die.

FIG. 7 is a perspective view of an upper molding block.

FIG. 8 is an explanatory view of a conventional foamed synthetic resin container.

FIG. 9 is an explanatory view of a conventional foamed synthetic resin container having another configuration.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Foam synthetic resin container 2 Container main body 3 Lid member 4 Boundary part 5 Housing part 6 Flange part 7 Flange part 8 Fitting protrusion 10 Groove 11 Protrusion 12 Buckling regulation part 13 Perforation 13a Drilled hole 13b Connection part 14 Adjusting part 20 Core mold 21 Molding part 22 Molding part 23 Upper molding block 24 Convex ridge 25 Blade body 25a Blade 26 Pressing part 30 Cavity mold 31 Molding part 32 Molding part 33 Lower molding block 34 Groove 35 Receiving plate

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29L 22:00 (72) Inventor Yasuo Kamon 1-9-1, Akashiadai, Mita-shi, Hyogo (72) Inventor Tsutomu Someya 600 Tsukazaki, Sakaimachi, Sarushima-gun, Ibaraki Pref. AG20 AG21 AG24 AG28 AG30 AH57 AH58 AJ03 UA15 UB01 UK02 UW25

Claims (17)

[Claims] An opening in the container body is provided, comprising a container body and a lid member integrally formed using a foamed synthetic resin sheet material, wherein the lid member is rotated around a boundary between the container body and the lid member. In the foamed synthetic resin container configured so that the portion can be closed with a lid member, a perforation formed by arranging a plurality of perforation holes penetrating the front and back surfaces in the boundary portion in series with a gap in the length direction of the boundary portion Characterized in that at least two of the containers are formed substantially parallel to each other along the line. 2. The foamed synthetic resin container according to claim 1, wherein the at least two perforated holes are arranged in a staggered manner. 3. An inwardly facing inner surface is depressed in a state where the lid member is rotated in the closing direction at the boundary portion, and at least two grooves are substantially parallel along a length direction of the boundary portion. The foamed synthetic resin container according to claim 1 or 2, wherein a perforation is formed in each of the valleys of the at least two grooves. 4. A foam synthetic resin container according to claim 3, wherein a thick ridge having an angled cross section is formed between said at least two grooves. 5. The foam synthetic resin container according to claim 3, wherein a buckling restricting portion is formed at a valley portion of the groove to protrude toward an inner surface and an outer surface. 6. The foam according to claim 3, wherein an adjusting portion formed by stepping down an inner surface in a thickness direction is formed outside the at least two grooves along the grooves. Synthetic resin container. 7. An opening in the container main body having a container main body and a lid member integrally formed using a foamed synthetic resin sheet material, wherein the lid member is rotated around a boundary between the container main body and the lid member. In the foamed synthetic resin container configured so that the portion can be closed by a lid member, at the boundary portion, the inner surface side facing inward is depressed in a state where the lid member is rotated in the closing direction, and at least two grooves are formed. An adjusting portion formed substantially parallel to the length direction of the boundary portion and formed by stepping down the inner surface side in the thickness direction outside the at least two grooves, is formed along the grooves. Characteristic foam synthetic resin container. 8. A foam synthetic resin having a set of molding dies for integrally molding a foam synthetic resin container having a container body and a lid member rotatably connected at a boundary portion using a foam synthetic resin sheet material. In the resin container molding apparatus, the one molding die is provided with at least two blades for molding at least two substantially parallel perforations extending along a length direction of a boundary portion, and the other one is provided. A molding device for a foamed synthetic resin container, wherein a receiving portion for receiving a blade inserted through the foamed synthetic resin sheet material is provided in the molding die of (1). 9. A method for forming at least two perforations, the method comprising:
9. The molding of the foamed synthetic resin container according to claim 8, wherein the blades are formed at regular intervals on each of the blades, and the positions of the blades in at least two blades are staggered in the length direction of the boundary portion. apparatus. 10. The molding apparatus for a foamed synthetic resin container according to claim 8, wherein said blade body is formed in a rectangular wave shape on one side and a blade is provided at an end thereof. 11. The foam synthetic resin container molding apparatus according to claim 8, wherein a concave groove for receiving a blade is formed as the receiving portion. 12. The molding apparatus for a foamed synthetic resin container according to claim 8, wherein a receiving plate for receiving a blade is provided as the receiving portion, the receiving plate being separate from the other forming die. 13. The molding apparatus for a foamed synthetic resin container according to claim 12, wherein said receiving plate is made of polypropylene. 14. At least two ridges for forming at least two grooves in a portion of the one mold that forms a boundary portion substantially in parallel along a longitudinal direction of the boundary portion. A pressing portion for forming an adjusting portion formed by stepping down the inner surface side of the boundary portion in the thickness direction is formed along the ridge on the outside of the at least two ridges. 13
The molding apparatus for a foamed synthetic resin container according to any one of the above items. 15. A foam synthetic resin having a set of molds for integrally molding a foam synthetic resin container having a container body and a lid member rotatably connected at a boundary portion using a foam synthetic resin sheet material. In the resin container molding apparatus, at least two strips formed by depressing an inner surface side facing inward while the lid member is rotated in a closing direction in a portion of the one molding die that forms a boundary portion. At least two ridges are provided for forming the groove substantially parallel along the length direction of the boundary, and the inner surface side of the boundary falls down in the thickness direction outside the at least two ridges. A molding device for a foamed synthetic resin container, characterized in that a pressing portion for molding the adjusting portion formed is formed along a ridge. 16. A molding apparatus according to any one of claims 8 to 14, wherein both molding dies are closed with the foamed synthetic resin sheet material set between the molding dies.
The container body and the lid member are molded and at least two
Foaming synthetic, characterized in that at least two perforations are formed at the boundary between the container body and the lid member by inserting the cutting edge into the foamed synthetic resin sheet material until the blades of the blades contact the receiving plate. A method for molding a resin container. 17. A container body and a lid member are formed by closing both molds with the foaming synthetic resin sheet material set between both molds using the molding apparatus according to claim 14 or 15. At the same time, at least two grooves are formed by at least two projections at the boundary between the container body and the lid member, and the foamed synthetic resin sheet material is pressed by the pressing portion to form at least two lines. A method for molding a foamed synthetic resin container, characterized by molding an adjusting portion formed by stepping down an inner surface side of a boundary portion in a thickness direction outside a groove.