HK1081500B - Packaging bag - Google Patents

Description

Packaging bag (WU JI KE LI)

Technical Field

The present invention relates to a packaging bag having an unsealed rough surface portion.

Background

Conventionally, in a packaging bag containing powder or liquid therein, a method of providing a slit or the like at a side edge of the packaging bag for easy opening has been used. However, the formation of the slits affects the appearance of the packaging bag. Further, the risk of opening the packaging bag by an erroneous operation also increases.

In order to overcome such a problem, the inventors of the present invention have disclosed a packaging bag having a rough surface portion at a position to be a starting point of opening (Japanese patent application No. 2001-140543). Here, the rough surface portion refers to an aggregate of a plurality of fine recesses formed in the outer layer of the laminate film and a plurality of fine through holes penetrating the outer layer. Such a rough surface portion is provided on a side edge or the like of the packaging container, and the strength of the rough surface portion is reduced, so that the packaging bag can be easily opened from the rough surface portion.

The invention in which the rough surface portion is formed on the packaging bag like this has been disclosed in several other patent applications other than the above patent application (for example, refer to japanese unexamined patent application publication No. 2002-211584).

However, if the rough surface portion is provided on the packaging bag, the rough surface portion may have a lower shielding property than other portions. In particular, in a storage case of an automatic packaging machine, when a packaging bag is pulled while being wound, a local force is excessively applied to the packaging bag, and therefore, a portion subjected to rough surface processing, an aluminum foil or other film material constituting a laminated film, or the like is stretched, and the shielding property of the rough surface portion is lowered.

The substance contained in the package bag may be a granular substance other than a liquid. When the granular material is contained, the granular material may be clogged in the discharge portion and may not be smoothly discharged from the discharge portion.

Disclosure of Invention

The present invention has been made in view of the above problems, and an object of the present invention is to provide a packaging bag having a rough surface portion, which can be easily opened by further improvement and has excellent shielding properties.

In order to solve the above problem, in 2 positions parallel bending the laminated film, make the laminated film end each other butt, then will butt the aforesaid end each other and bond and form the tube, and there are upper sealing part and lower sealing part to seal the upper opening and lower opening of the tube separately; the 2 folded positions of the laminate film are each formed as a side edge portion which defines a boundary between a front surface portion and a back surface portion of the packaging bag, and a rough surface opening portion formed by an aggregate of a plurality of fine recessed portions and a plurality of fine through holes is provided in the upper seal portion of the front surface portion and/or the back surface portion so as to include one side edge portion, the recessed portions are formed in an outer layer which forms the laminate film, the through holes penetrate the outer layer, and the opening portion is provided in a range of the upper seal portion so as to be located above a lower end edge of the upper seal portion.

In the present invention, the rough surface opening portion is provided at the side edge portion of the packaging bag formed by bending, so that the packaging bag can be easily opened. Further, the rough surface opening portion formed of the aggregate of the plurality of fine recesses formed in the outer layer constituting the laminate film and the plurality of fine through holes penetrating the outer layer is formed above the lower end edge of the upper seal portion so as to be isolated from the storage space for storing the inner seal, so that the storage space is not adversely affected, and the barrier property of the packaging bag can be extremely high.

In the packaging bag, the butted end portions are back seal portions each having a certain width by adhering the respective end portions to each other on the back surface portion side of the packaging bag, the upper seal portion is composed of a 1 st seal portion and a 2 nd seal portion, the 1 st seal portion seals the front surface portion and the back surface portion relatively deeply from an upper end in a vertical direction within a predetermined range from the one side edge portion to a width direction of the packaging bag, the 2 nd seal portion seals the front surface portion and the back surface portion relatively shallowly from the upper end in a range between the 1 st seal portion and a side edge portion on an opposite side to the bent portion in the vertical direction as compared with a depth of the 1 st seal portion, the rough opening portion is provided within the range of the 1 st seal portion, and the intermediate portion composed of an aggregate of a plurality of fine recesses and a plurality of fine through holes is rough, the recess is formed in the outer layer of the laminate film, and the through-hole penetrates the outer layer.

With the packaging bag thus constructed, the intermediate rough surface portion can serve as a transfer function for opening. Therefore, the unsealing can be smoothly continued from the position of the back seal portion without being hindered. Since the intermediate rough surface portion is provided within the range of the 1 st seal portion, the accommodating space for accommodating the inner seal is completely independent from the intermediate rough surface portion. Therefore, the packing bag can have very high shielding property.

In order to solve the above problems, the present invention provides a packaging bag, which is formed by folding a laminated film in two to form a folded portion as a single side edge portion that borders a front surface portion and a back surface portion of the packaging bag, and in which a sealing portion that bonds the front surface portion and the back surface portion is provided at a position on the other 3 sides of the laminated film than the folded portion; a rough surface opening portion composed of an aggregate of a plurality of fine recesses and a plurality of fine through holes is provided in the upper seal portion which is an upper portion of the packaging bag in the front surface portion and/or the rear surface portion so as to include the bent portion which is the side edge portion, the recesses are formed in an outer layer which constitutes the laminate film, the through holes penetrate the outer layer, and the rough surface opening portion is provided in a range of the upper seal portion so as to be located above a lower end edge of the upper seal portion.

According to the present invention, since the rough-surface opening portion is provided at the side edge portion of the packaging bag formed by bending, the packaging bag can be easily opened. Further, the rough surface opening portion formed by the aggregate of the plurality of fine recessed portions is formed above the lower end edge of the upper seal portion and is isolated from the housing space for housing the inner seal, so that the housing space is not adversely affected and the shielding property of the packaging bag can be extremely high.

In the packaging bag of the present invention, the upper seal portion is formed of a 1 st seal portion and a 2 nd seal portion, the 1 st seal portion sealing the front surface portion and the back surface portion relatively deeply from an upper end in a vertical direction within a predetermined range from the bent portion to a width direction of the packaging bag, the 2 nd seal portion sealing the front surface portion and the back surface portion relatively shallowly from the upper end in the vertical direction from a depth of the 1 st seal portion in a range between the 1 st seal portion and a side edge portion opposite to the bent portion, and the rough surface opening portion is provided within the range of the 1 st seal portion.

According to the present invention, firstly, the opening can be easily performed. Further, since the rough surface opening portion is provided within the range of the 1 st seal portion, the housing space for housing the inner seal is completely independent of the rough surface opening portion. Therefore, the packing bag can have very high shielding property.

Second, when the packaging bag is opened, the lower portion of the 2 nd seal portion can function as a discharge portion communicating the accommodating space for accommodating the inner seal and the outside of the packaging bag.

On the other hand, the packaging bag of the present invention is a packaging bag in which a laminated film is folded in parallel at 2 positions, the ends of the laminated film are butted against each other, and then the butted ends are bonded to each other to form a cylindrical body, and an upper sealing portion and a lower sealing portion for sealing an upper opening portion and a lower opening portion of the cylindrical body are provided; the 2 folded positions of the laminate film are each formed as a side edge portion which defines a boundary between a front surface portion and a back surface portion of the packaging bag, the butted end portions are formed as back seal portions in which respective end portions are bonded to each other by a predetermined width on the back surface portion side of the packaging bag, the upper seal portion is formed of a 1 st seal portion and a 2 nd seal portion, the 1 st seal portion seals the front surface portion and the back surface portion relatively deeply from an upper end in a vertical direction within a predetermined range in a width direction of the packaging bag from the one side edge portion to a vicinity of the back seal portion, the 2 nd seal portion seals the front surface portion and the back surface portion relatively shallowly from the upper end in the vertical direction from a depth of the 1 st seal portion to a depth of the back surface portion in a range between the 1 st seal portion and a side edge portion on an opposite side to the one side edge portion, a rough surface opening portion composed of an aggregate of a plurality of fine recessed portions and a plurality of fine through holes is provided on the 1 st seal portion in the front surface portion and/or the back surface portion so as to include one side edge portion, an intermediate rough surface portion composed of an aggregate of a plurality of fine recessed portions and a plurality of fine through holes is provided on a bottom portion of the back seal portion in the back surface portion opposed to the other side edge portion, the recessed portions are formed on an outer layer of the laminate film, and the through holes penetrate the outer layer.

Since the packaging bag is thus formed, a packaging bag having a large discharge portion can be formed.

In the present invention, the packaging bag may be formed by folding the laminate film in parallel at 2 positions to butt the ends of the laminate film, and then bonding the butted ends to each other to form a cylindrical body, and further, an upper sealing portion and a lower sealing portion for sealing an upper opening portion and a lower opening portion of the cylindrical body may be provided; the 2 folded positions of the laminate film are each formed as a side edge portion which defines a boundary between a front surface portion and a back surface portion of the packaging bag, the butted end portions are formed as back seal portions in which respective end portions are bonded to each other by a predetermined width on the back surface portion side of the packaging bag, the upper seal portion is formed of a 1 st seal portion and a 2 nd seal portion, the 1 st seal portion seals the front surface portion and the back surface portion relatively deeply from an upper end in a vertical direction within a predetermined range in a width direction of the packaging bag from the one side edge portion to a vicinity of the back seal portion, the 2 nd seal portion seals the front surface portion and the back surface portion relatively shallowly from the upper end in the vertical direction as compared with a depth of the 1 st seal portion in a range between the 1 st seal portion and a side edge portion on an opposite side to the one side edge portion, a rough surface opening portion formed of an aggregate of a plurality of fine recesses and a plurality of fine through holes is provided in the back surface portion in the up-down direction between the lower end edge of the 1 st seal portion and the lower end edge of the 2 nd seal portion and/or between the lower end edge of the 1 st seal portion and the lower end edge of the 2 nd seal portion so as to include the other side edge portion, an intermediate rough surface portion formed of an aggregate of a plurality of fine recesses and a plurality of fine through holes is provided in a bottom portion of the back surface portion of the back seal portion facing the other side edge portion, the recesses are formed in an outer layer of the laminate film, and the through holes penetrate through the outer layer.

In the packaging bag, the rough-surface opening portion is formed so as to gradually protrude from the upper end and the lower end toward the center in the vertical direction and toward the center in the width direction of the packaging bag.

In the packaging bag of the present invention, the rough-surface opening portion is provided with a portion in which the density of the recessed portions is relatively sparsely formed along the peripheral edge of the rough-surface opening portion, a portion in which the depth of the recessed portions is relatively shallowly formed along the peripheral edge of the rough-surface opening portion, or a portion in which the size of the recessed portions is relatively small along the peripheral edge of the rough-surface opening portion.

Drawings

Fig. 1 is a perspective view of a pillow pack according to an embodiment of the present invention.

Fig. 2 is a perspective view showing the vicinity of the intermediate rough surface portion formed on the back surface portion of the packaging bag shown in fig. 1.

Fig. 3 is a schematic explanatory view showing a film material of the rough surface opening portion and the intermediate rough surface portion in an enlarged manner.

Fig. 4 is an explanatory view showing a state where the packaging bag shown in fig. 1 is opened.

Fig. 5 is a perspective view of a packaging bag according to another embodiment, which is different from the embodiment of the packaging bag shown in fig. 1.

Fig. 6 is a plan view of the rough-surface opening portion provided with a portion formed so that the density of the recessed portions is relatively sparsely formed along the peripheral edge of the rough-surface opening portion.

Fig. 7 is a plan view of the rough-surface opening portion provided with a portion formed so that the depth of the concave portion is relatively shallow along the peripheral edge of the rough-surface opening portion.

Fig. 8 is a sectional view showing a section VIII-VIII of fig. 7.

Fig. 9 is a plan view of the rough-surface easy-open portion provided with a portion in which the size of the concave portion is relatively small along the peripheral edge of the rough-surface easy-open portion.

Fig. 10 is a cross-sectional view showing the X-X section of fig. 9.

Fig. 11 is a view showing an embodiment of a rough-surface opening portion formed so as to gradually protrude from the upper end and the lower end of the rough-surface opening portion toward the center in the vertical direction and toward the center in the width direction of the packaging bag.

Fig. 12 is a view showing a rough-surface easy-open portion according to another embodiment, which is different from the embodiment of the rough-surface easy-open portion shown in fig. 1.

Fig. 13 is a perspective view of a packaging bag in which an upper seal portion is formed to enlarge a discharge portion.

Fig. 14 is a diagram comparing the opened state of the packaging bag.

Fig. 15 is a perspective view of a packaging bag according to yet another embodiment.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 and 2 show a packaging bag 1 according to an embodiment of the present invention. The packaging bag 1 is formed by folding a sheet of film material in parallel at 2 positions so that the ends thereof are butted against each other. The butted end portions are bonded to each other to form a cylindrical body, and an upper opening and a lower opening of the cylindrical body are hermetically sealed.

The packaging bag 1 has a front portion 2 and a back portion 3 facing the front portion 2, and an upper seal portion 5 and a lower seal portion 9 formed by heat-sealing the front portion 2 and the back portion 3 are formed along respective upper and lower edges of the packaging bag 1. The two side edges of the packaging bag 1 are configured such that 2 folded portions 15 and 16 of the film material are located at the two side edge portions of the packaging bag 1. The packaging bag 1 is divided into a front portion 2 and a rear portion 3 by the bent portions 15 and 16.

The back surface portion 3 is provided with a back seal portion 4 formed by bonding the side edges of the film material to each other in a palm-to-palm manner, and the back seal portion 4 extends in the vertical direction of the packaging bag 1. The back seal portion 4 is provided substantially at the center in the width direction of the packaging bag 1 and projects outward from the packaging bag 1.

The lower seal portion 9 for sealing the lower portion of the packaging bag 1 is configured as follows: the front surface portion 2 and the back surface portion 3 are heat-sealed from the lower end edge of the packaging bag 1 across the entire width direction. On the other hand, the upper seal portion 5 for sealing the upper portion of the packaging bag 1 is formed in 2 stages in the width direction of the packaging bag 1: a portion relatively deep from the sealing depth of the upper end and a portion relatively shallow from the sealing depth of the upper end. A1 st seal part 6 is formed in a region from one side edge part of the packaging bag 1 to approximately 70% in the width direction, and the 1 st seal part 6 has a relatively deep seal depth from the upper end edge. On the other hand, a 2 nd seal part 7 is formed in a section between the 1 st seal part 6 and the other side edge of the packaging bag 1, and the 2 nd seal part 7 has a relatively shallow seal depth from the upper end edge.

In the packaging bag 1, a space between an upper sealing portion 5 formed at an upper portion of the packaging bag 1 and a lower sealing portion 9 formed at a lower end is defined as a housing space for housing an inner seal. In the section where the 2 nd sealing portion 7 is formed, a portion of the housing space protruding upward is a discharge portion 8 for discharging the inner seal, which will be described later in detail.

Further, the rough surface opening portion 10 is formed in the bent portion 15 including one side edge of the 1 st seal portion 6 having a deep seal depth. The rough surface opening portion 10 is a portion which becomes a starting point when the packaging bag 1 is opened, and includes a bent portion 15 of one side edge, and is formed within the range of the 1 st sealed portion 6, and the bent portion 15 is formed with the 1 st sealed portion 6 having a deep sealed depth. In the packaging bag 1 shown in fig. 1, the rough surface opening 10 is formed on both the front portion 2 and the front portion 3 around the bent portion 15. However, if the rough surface opening portion 10 includes the bent portion 15, the rough surface opening portion 10 does not have to be formed on both the front portion 2 and the back portion 3, and may be formed only on one of the front portion 2 and the back portion 3.

Further, in the packaging bag 1, an intermediate rough surface portion 11 is formed on the bottom portion of the back seal portion 4 in a range where the 1 st seal portion 6 is formed. The intermediate rough surface portion 11 prevents the rough surface unsealing portion 10 from being unsealed smoothly at the position of the back seal portion 4. The intermediate rough surface portion 11 is formed on the bottom portion of the back seal portion 4 opposed to a folded portion 16 as shown in fig. 2, and the folded portion 16 is a folded portion of one side edge of the packaging bag 1 on the opposite side of the folded portion 15 of the one side on which the rough surface opening portion 10 is formed. In this way, the intermediate rough surface portion 11 is formed in the bottom portion of the surface of the back seal portion 4 facing the bent portion 16 of the other side edge, and the intermediate rough surface portion 11 functions again as a starting point of unsealing at the position of the back seal portion 4, thereby relaying the unsealing.

The rough surface opening portion 10 formed in the bent portion 15 of one side edge of the packaging bag 1, the intermediate rough surface portion 11 formed in the bottom portion of the back seal portion 4, and the discharge portion 8 formed in the section having the 2 nd seal portion 7 have a height approximately equal to each other in the height direction of the packaging bag 1.

Fig. 3 is an enlarged view showing an example of the layer structure of the rough surface opening portion 10 and the intermediate rough surface portion 11, which is a film material constituting the packaging bag 1. As shown in fig. 3, a laminate film composed of a plurality of layers is used as the film material. In the film material, a PE (polyethylene) film 24 is disposed on the inner layer side of a PET (polyethylene terephthalate) film 20 as a base material of the film material, and these are laminated by being bonded with an adhesive 23. A coating layer 21 of PVDC (polyvinyl dichloride) is applied to the inner surface of the PET film 20 which becomes the outer layer, and the film material is made to have an oxidation barrier property. Further, a printing ink layer 22 is provided on the inner side of the PVDC coating layer 21, and characters and patterns of the packaging bag 1 are drawn on the printing ink layer 22. An adhesive 23 for bonding the PET film 20 and the PE film 24 is provided between the printing ink layer 22 and the PE film 24.

The PET film 20 to be the outer layer was formed of 2-axially extended PET having a film thickness of 12 μm, and PVDC having a film thickness of about 3 μm was applied to the inner surface of the PET film 20. On the other hand, PE. having a film thickness of 70 μm was used as the PE film 24 to be the inner layer, and dry laminate (dry laminate) adhesive 23 or solvent-free adhesive 23 was used as the adhesive 23 for bonding the outer layer and the inner layer. Instead of dry lamination, extrusion lamination using PE may be used.

In addition, in FIG. 3, it is shown that the PVDC coating layer 21 is coated on the inner layer side of the PET film 20, but instead of the PVDC coating layer 21, Al is coated₂O₃、SiO₂The metal is vapor-deposited on the inner surface of the PET film 20 to form a vapor-deposited layer, whereby high barrier properties can be obtained. In order to obtain a very high barrier property, a film material may be formed by providing an aluminum foil layer or an EVOH (ethylene vinyl alcohol copolymer) layer on various base films.

The rough surface opening portion 10 and the intermediate rough surface portion 11 are each an aggregate of a plurality of fine recessed portions formed on the outer layer of a film material made of the laminate film and a plurality of through holes (the recessed portions and the through holes are denoted by reference numeral 12) penetrating only the outer layer, and the recessed portions and the through holes 12. As shown in fig. 3, each of the recesses and the through-holes 12 constituting the rough surface opening portion 10 and the intermediate rough surface portion 11 penetrate through the PET film 20 side of the outer layer of the film material, but do not penetrate through at least the PE film 24 constituting the innermost layer. The rough surface opening 10 and the intermediate rough surface 11 are formed by pressing #80 to #180 carborundum paper against the outer layer side of the film material. However, it is also possible to form pinholes in the outer layer, thereby forming an intermediate rough surface portion.

In the packaging bag 1 having the above configuration, the inner seal is accommodated in the accommodating space formed between the upper sealing portion 5 at the upper portion and the lower sealing portion 9 at the lower portion. Further, since the rough surface opening portion 10 and the intermediate rough surface portion 11 are formed in the range of the 1 st seal portion 6 having a deep seal depth from the upper portion, the rough surface opening portion 10 and the intermediate rough surface portion 11 are completely isolated from the housing space. Therefore, the housing space is not affected at all by the rough surface unsealing portion 10 and the intermediate rough surface portion 11, and a very high shielding property can be ensured.

As shown in fig. 4, the packaging bag 1 is opened with the rough surface opening portion 10 as a starting point for opening the packaging bag 1. First, the rough surface opening portion 10 is torn by hand to start opening the packaging bag 1 (fig. 4 (a)). Subsequently, the opening is performed, and the torn tip reaches the back seal portion 4 (fig. 4 (b)). An intermediate rough surface portion 11 is provided on the bottom of the back seal portion 4. The intermediate rough surface portion 11 is provided on the bottom portion of the back seal portion 4 opposed to the bent portion 16 of the opposite side edge of the rough surface unsealing portion 10, so that the intermediate rough surface portion 11 can function as an unsealing start point again. Therefore, the back seal portion 4 can be continuously and smoothly unsealed. Thereafter, the opening is continued, and the distal end of the tearing is passed through the 1 st seal part 6 having a deep seal depth, and reaches the discharge part 8 formed in the section of the 2 nd seal part 7 and having the housing space projecting upward (fig. 4 (c)). When the opening is performed to the other side edge, the housing space communicates with the outside through the discharge portion 8, and the inner seal can be freely discharged (fig. 4 (d)).

The contents stored in the packaging bag 1 may be in the form of liquid, powder, or the like. The liquid-containing inner package can contain not only a relatively viscous seasoning such as soy sauce but also a relatively viscous seasoning such as chili paste, mayonnaise, or ketchup. Further, a liquid medicine may be contained in the packaging bag 1. The inner powder package may contain powdery or granular medicines in addition to powdery seasonings such as powdered soup and pepper. I.e. the package 1 is adapted to receive an inner seal sensitive to shielding.

The above description has been made of the pillow pack type packaging bag in which the folded portions of the film material are provided at both side edges of the packaging bag and the back seal portion is provided at the back side, but the packaging bag of the present invention is not limited to this.

Fig. 5 shows a three-side sealed package bag 30 having a folded portion 32 of a film material provided only on one side edge of the package bag 30. The packaging bag 30 is constituted as follows: a sheet of film material is folded in half to form a pair of planar portions 31, 31. One side edge of the packaging bag 30 is provided with a folded portion 32, and the other side edge of the packaging bag 30 is provided with a sealing portion 34, and the sealing portion 34 is configured as follows: a pair of flat surface portions 31, 31 of a predetermined width are sealed along the edge of the other side edge of the packaging bag 30.

A seal 33 is formed at the lower end of the packaging bag 30, and the seal 33 is configured as follows: a pair of flat surface portions 31, 31 having a constant width are sealed along the lower end edge of the packaging bag 30. In response to this, a sealing portion 35 is formed at the upper end of the packing bag 30 in the width direction of the packing bag 30, and the sealing portion 35 is formed in 2 stages: a portion relatively deep from the sealing depth of the upper end and a portion relatively shallow from the sealing depth of the upper end. The packaging bag 30 is also formed with a 1 st seal portion 36 in a region from the folded portion 32 provided at one side edge to approximately 70% of the packaging bag 30 in the width direction, and the 1 st seal portion 36 has a relatively deep seal depth from the upper end edge. A 2 nd seal portion 37 is formed in a section between the 1 st seal portion 36 and the other side edge of the packaging bag 30, and a seal depth of the 2 nd seal portion 37 from the upper end edge is relatively shallow.

The space portion surrounded by the sealing portions 33, 34, 35 and the folded portion 32, which seal three sides of the package bag 30, is a housing space for housing the inner seal. In the section where the 2 nd seal portion 37 is formed, a portion of the housing space protruding upward is a discharge portion 38 for discharging the inner seal.

Furthermore, a rough surface opening 39 is formed in the bent portion 32 including the 1 st sealing portion 36 having a deep sealing depth. The rough surface opening part 39 is also formed by pressing #80 to #180 carborundum paper or the like against the outer layer side of an appropriate thin film material to form an aggregate of a plurality of fine recesses. The package bag 30 has a rough surface opening portion 39 formed in one side edge of the package bag 30 and a discharge portion 38 formed in a section having the 2 nd seal portion 37, which have a height approximately equal to each other in the height direction of the package bag 30.

When the packaging bag 30 is opened, the discharge portion 38 in the section having the 2 nd seal portion 37 is opened by tearing the upper portion of the packaging bag in the width direction with the rough surface opening portion 39 as the starting point of opening, whereby the inner seal can be discharged.

As shown in fig. 6 to 10, the rough surface opening portions formed in the packaging bag 1 and the packaging bag 30 described above may be provided.

The rough surface opening portion 50 shown in fig. 6 is constituted by 2 portions, which are a fine recessed portion formed in the outer layer of the laminate film, and a dense portion 51 and a sparse portion 52 of a through hole penetrating only the outer layer. The dense portion 51 is formed in a rectangular shape having one side of a bent portion 54 which is one side. On the other hand, the sparse-density portion 52 is formed along the peripheral edge of the rough-surface opening portion 50 so as to surround the dense-density portion 51.

In this way, by forming the rough surface opening portion 50 by placing the dense portion 51 inside the rough surface opening portion 50 and surrounding the dense portion 51 with the sparse portion 52, the dense portion 51 can be torn by hand, and the packaging bag can be easily opened. On the other hand, by providing the sparse-density portion 52 around the periphery, even when the protrusion collides with the rough-surface opening portion 50 during the production or transportation of the packaging bag, the area of the dense-density portion 51 which is easily broken is small relative to the entire area of the rough-surface opening portion 50, so that the probability of tearing the packaging bag due to an erroneous operation can be reduced.

In addition, the rough surface opening portion 50 is also provided with: the upper sealing portion 53 is located above the lower edge 53a of the upper sealing portion 53 in the range where the upper sealing portion 53 is formed. Thus, the rough surface opening portion 50 is isolated from the housing space 55 housing the inner seal, and a high shielding property can be secured. The rough-surface easy-to-open portion 50 may be provided on either the front surface portion or the back surface portion, or may be provided on both surfaces.

Fig. 7 and 8 show a rough surface opening part 60 according to another embodiment. The rough surface unsealing section 60 is constituted by two parts: the deep portions 61 of the fine recesses and the shallow portions 62 of the fine recesses. As shown in fig. 7, the deep portion 61 is formed in a rectangular shape having one side of a bent portion 64 which is one side of one side edge. The shallow-depth portion 62 is formed along the peripheral edge of the rough-surface opening portion 60, and surrounds the deep-depth portion 61. Fig. 8 is a cross-sectional view schematically showing a cross section of the film material on which the rough-surface opening portion 60 is formed. As shown in fig. 8, the depth of each concave portion 61a.. 61a of the deep portion 61 is D1 so that the bottom of each concave portion 61a.. 61a reaches the vicinity of the boundary between the outer layer 68 and the inner layer 69. In the deep portion 61, there are mixed through holes that penetrate only the outer layer 68. On the other hand, the depth D2 of each recess 62a.. 62a of the shallow-depth portion 62 is formed to be approximately half the depth of the recess 61a.. 61a. The recesses 61a.. 61a and the through holes 61b.. 61b of the deep portions 61 are formed only in the outer layer 68 without reaching the inner layer 69.

In this way, the recessed portion formed in the rough surface opening portion 60 is configured as 2 portions, i.e., the deep portion 61 and the shallow portion 62, and thus the strength of the deep portion 61 is relatively reduced, and the packaging bag can be easily torn by hand. On the other hand, by providing the shallow depth portion 62 so as to surround the periphery of the deep depth portion 61, even when the projection collides with the rough surface opening portion 60 at the time of manufacturing or carrying the packaging bag, the area of the deep depth portion 61 which is likely to be broken is smaller than the entire area of the rough surface opening portion 60, so that the probability of tearing the packaging bag due to an erroneous operation can be reduced.

In addition, the rough surface opening portion 60 is also provided with: the upper seal 63 is located above the lower edge 63a of the upper seal 63 in the region where the upper seal 63 is formed. The rough-surface easy-to-open portion 60 may be provided on either the front surface portion or the back surface portion, or may be provided on both surfaces.

Fig. 9 and 10 further show a rough surface opening part 70 according to another embodiment. The unsealed rough surface part 70 is composed of an aggregate part 71 of a recess and a through hole (the recess and the through hole are collectively denoted by a reference numeral 71 a) which penetrates the outer layer 76, a relatively large diameter d1 which is formed in the outer layer 76, and an aggregate part 72 of a recess 72a which has a relatively small diameter d 2. As shown in fig. 9 and 10, the aggregate portion 71 of the large recess and the through hole 71a is formed in a rectangular shape having one side portion, i.e., the bent portion 74. The aggregate portion 72 of the small recess 72a is formed along the peripheral edge of the rough surface opening portion 70, and surrounds the large recess and the aggregate portion 71 of the through hole 71 a. In the rough-surface easy-to-open portion 70, the recesses, the through holes 71a, and 72a are formed only in the outer layer 76, not in the inner layer 77 (see fig. 10).

In this way, the rough surface opening portion 70 is constituted by the aggregate portion 71 of the relatively large recesses and through holes 71a and the aggregate 72 of the relatively small recesses 72a, whereby the strength of the aggregate portion 71 of the large recesses and through holes 71a can be made relatively low, and the strength of the aggregate 72 of the small recesses 72a can be made relatively high. With this, the aggregate portion 71 of the large recess can be easily torn by hand. On the other hand, the aggregate portion 72 of the small concave portion can reduce the probability of tearing the packaging bag due to an erroneous operation even when the protrusion collides with the rough-surface opening portion 70 at the time of manufacturing or transportation of the packaging bag.

In addition, the rough surface opening part 70 is also provided with: the upper seal portion 73 is formed above the lower edge 73a of the upper seal portion 73. The rough-surface easy-to-open portion 70 may be provided on either the front surface portion or the back surface portion, or may be provided on both surfaces.

Although the rough-surface opening portion has been described above as being rectangular in shape, the rough-surface opening portion may be formed so as to gradually protrude from the upper end and the lower end toward the center in the vertical direction and toward the center in the width direction of the packaging bag, as shown in fig. 11 or 12.

The rough-surface opening portion 80 shown in fig. 11 is formed in a triangular shape, and a portion 81 that becomes a base of the triangular shape coincides with a bent portion 82 that is one side edge portion of the packaging bag. The rough surface opening portion 80 has an upper end 80a and a lower end 80b located on the bent portion 82. The rough-surface opening portion 80 gradually protrudes from the upper end 80a and the lower end 80b toward the center in the vertical direction and toward the center in the width direction of the packaging bag. The central portion 80c in the vertical direction is a vertex of a triangle.

The rough-surface unsealing part 80 shown in fig. 11 is formed in the range of the upper seal part 83 and is provided above the lower edge 83a of the upper seal part 83.

The rough surface opening portion 85 shown in fig. 12 is formed in a semicircular shape, and the diameter portion 86 coincides with a bent portion 87 which is one side edge portion of the packaging bag. The rough surface opening portion 85 is formed as follows: the upper end 85a and the lower end 85b are positioned at the bent portion 87, and the peripheral edge thereof protrudes in an arc shape from the upper end 85a and the lower end 85b toward the center in the width direction of the packaging bag as approaching the center in the vertical direction. In the example shown in fig. 12, a semicircular shape is shown, but an elliptical shape may be used.

The rough-surface opening portion shown in fig. 11 and 12 is formed to gradually protrude from the upper end and the lower end toward the center in the width direction of the packaging bag as approaching the center in the vertical direction, and thus the area occupied by the rough-surface opening portion can be reduced without impairing the ease of opening. By reducing the area occupied by the rough surface opening portion, the probability that some external object acts on the rough surface opening portion is reduced, and thus the chance of tearing the packaging bag due to misoperation can be reduced.

The rough surface opening portion 85 shown in fig. 12 is also formed in the range of the upper seal portion 88 and is provided above the lower edge 88a of the upper seal portion 88.

Next, a packaging bag according to another embodiment will be described with reference to fig. 13 and 14.

The package 100 itself is basically constructed as the package 1 shown in fig. 1 by folding a sheet of film material in parallel at 2 locations so that the ends abut each other. The abutting end portions are bonded to each other to form a cylindrical body, and an upper opening portion and a lower opening portion of the cylindrical body are hermetically sealed.

The packaging bag 100 has a front portion 102 positioned on the back side of fig. 13 and a back portion 103 opposed thereto, and an upper sealing portion 105 and a lower sealing portion 109 formed by heat-sealing the front portion 102 and the back portion 103 are formed along the respective edges at the upper edge and the lower edge of the packaging bag 100. The two side edges of the packaging bag 1 are 2 folded portions 115 and 116 of the film material, and a back seal portion 104 formed by laminating the side edges of the film material so as to face each other is provided so as to extend in the vertical direction of the packaging bag 100.

The lower seal portion 109 is configured as follows: the front surface portion 102 and the back surface portion 103 having a predetermined width are heat-sealed from the lower edge. On the other hand, the upper seal portion 105 is formed in 2 stages in the width direction of the packaging bag 100: a relatively deep portion and a relatively shallow portion from the sealing depth of the upper end.

In a region between the folded portion 115, which is one side edge portion of the packaging bag 100, and a portion slightly closer to the folded portion 115 than the back seal portion 104 located at the center, a 1 st seal portion 106 having a relatively deep seal depth from the upper end edge is formed. On the other hand, a 2 nd seal part 107 having a relatively shallow seal depth from the upper edge is formed in a section between the 1 st seal part 106 and the folded part 116, which is the other side edge of the packaging bag 100. As shown in fig. 13, the upper seal 105 has a section of the 2 nd seal 107 wider than a section of the 1 st seal 106.

Furthermore, a rough surface opening portion 110 is formed in a bent portion 115 that is configured to form one side edge portion of the 1 st sealing portion 106. The rough surface opening portion 110 is formed to include a bent portion 115 as one side edge portion. The rough surface opening portion 110 is formed above the lower end edge of the 1 st seal portion 106 in the range of the 1 st seal portion 106. The rough surface opening portion 110 is formed on both the front surface portion 102 and the back surface portion 103 around the bent portion 115, but if the rough surface opening portion 110 includes the bent portion 115, it may be formed only on one of the front surface portion 102 and the back surface portion 103.

On the other hand, the intermediate rough surface portion 111 formed on the bottom portion of the back seal portion 104 is provided so as not to be included in the 2 nd seal portion 107. The intermediate rough surface portion 111 is located in a range between a lower side of a lower end edge of the 2 nd seal portion 107 and an upper side of a lower end edge of the 1 st seal portion 106 in the vertical direction of the packaging bag 100, and is formed at a position substantially at the same height as the rough surface opening portion 110. The intermediate rough surface portion 111 is also formed in the back seal portion 104 at a portion opposed to the other side edge portion opposite to the bent portion 115 where the rough surface opening portion 110 is formed, that is, the bent portion 116.

In the packaging bag shown in fig. 13, the section of the 2 nd seal part is set larger than the section of the 1 st seal part, so that the discharge port can be made larger as shown in fig. 14. Fig. 14(a) shows a spout 108 formed when the packaging bag 100 shown in fig. 13 is opened, and fig. 14(b) shows a spout 8 formed when the packaging bag shown in fig. 1, which has been described above, is opened. As shown in fig. 14, the discharge port 108 is obviously formed larger than the discharge port 8.

In the case where the inner seal stored in the packaging bag is liquid, the inner seal can be smoothly discharged even if the discharge port is relatively small as shown in fig. 14 (b). However, when the inner seal is a granular material, the inner seal is blocked at the discharge port and cannot be smoothly discharged if the discharge port 8 is small as shown in fig. 14 (b). Therefore, when the granular material is contained, as shown in fig. 14(a), the packaging bag 100 having the large discharge port 108 as shown in fig. 13 is preferably used.

Fig. 15 shows a packaging bag 120 according to another embodiment.

The packaging bag 120 is also formed by folding a sheet of film material in parallel at 2 positions so that the ends thereof are butted against each other. The abutting end portions are bonded to each other to form a cylindrical body, and an upper opening portion and a lower opening portion of the cylindrical body are hermetically sealed. The packaging bag 120 is provided with a front surface portion 122 located on the back surface side in fig. 15, a back surface portion 123 facing the front surface portion 122, an upper seal portion 125 sealing the upper portion, a lower seal portion 129 sealing the lower portion, and a back seal portion 124, and the back seal portion 124 is formed by palm-bonding the side edges of the film material. The two side edges of the package 1 are 2 folds 135, 136 of film material.

The lower seal portion 129 is configured as follows: the front surface portion 122 and the back surface portion 123 having a predetermined width are heat-sealed from the lower edge. On the other hand, the upper seal portion 125 is formed in 2 stages arranged in parallel in the width direction of the packaging bag 120: a 1 st sealing part 126 having a deep sealing depth from the upper end and a 2 nd sealing part 127 having a shallow sealing depth from the upper end.

In this packaging bag 120, a 2 nd seal portion 127 having a relatively shallow seal depth from the upper edge is formed in a section between the folded portion 135, which is one side edge portion, and a portion slightly closer to the folded portion 135 than the back seal portion 124 located at the center. On the other hand, a 1 st seal portion 126 having a relatively deep seal depth from the upper end edge is formed in a section between the 2 nd seal portion 127 and the other side edge portion of the packaging bag 120, i.e., the folded portion 136, and includes a back seal portion 124.

Further, a rough surface opening 130 is formed in the bent portion 135 constituting one side edge portion where the 2 nd seal portion 127 is formed. The rough surface opening portion 130 is formed to include a bent portion 135 as one side edge portion. The rough surface opening portion 130 is formed below the lower end edge of the 2 nd seal portion 127. Further, the rough surface opening portion 130 is formed with the rough surface opening portion 130 on both the front surface portion 122 and the back surface portion 123 with the bent portion 135 as the center. However, if the rough surface opening portion 130 includes the bent portion 135, it may be formed only on one of the front surface portion 122 and the back surface portion 123.

On the other hand, an intermediate rough surface portion 131 formed on the bottom portion of the back seal portion 124 is provided within the range of the 1 st seal portion 126. The intermediate rough surface 131 is also formed at a position substantially at the same height as the rough surface opening 130 in the vertical direction of the packaging bag 120. The intermediate rough surface portion 131 is also formed in the back seal portion 104 at a portion opposed to the bent portion 136, which is the other side edge portion on the opposite side of the bent portion 135 where the rough surface opening portion 130 is formed.

In addition, as for the rough-surface opening portion of the packaging bag shown in fig. 13 to 15, the rough-surface opening portion shown in fig. 6 to 12 may be appropriately selected and applied.

Although the above description describes the embodiment of opening the upper part of the packaging bag regardless of the pillow type packaging bag or the three-side-sealed packaging bag, for example, in the packaging bag containing the inner seal including the sticky paper, the rough-surface opening part may be provided in the central part of the packaging bag which is swollen by the inner seal.

As described above, according to the present invention, the rough surface opening portion is formed in the packaging bag, and thus the packaging bag can be opened very easily. The portion that becomes the starting point of opening is obtained by rough surface processing, so the appearance of the packaging bag can be very good. Further, unlike the notch, the risk of opening the packaging bag by an erroneous operation is very low.

In the pillow pack bag having the back seal portion, a rough surface portion is provided in the middle. Therefore, the unsealing can be smoothly continued even at the back seal portion position.

In addition, in the case where the rough surface opening portion and the intermediate rough surface portion are formed in the range of the sealing portion independent from the accommodating space, the accommodating space is not affected by the rough surface processing, and the packaging bag has a very high shielding property.

In the case where the 1 st seal portion having a relatively deep depth from the upper end seal of the packaging bag and the 2 nd seal portion having a relatively shallow depth from the upper end seal of the packaging bag are provided, the range of the 2 nd seal portion is set to be larger than the range of the 1 st seal portion in the width direction of the packaging bag, whereby the discharge port at the time of opening can be formed to be large.

In the present invention, the rough surface opening portion is provided with a portion in which the density of the recessed portions is relatively sparsely formed along the peripheral edge of the rough surface opening portion, a portion in which the depth of the recessed portions is relatively shallowly formed along the peripheral edge of the rough surface opening portion, or a portion in which the size of the recessed portions is relatively small formed along the peripheral edge of the rough surface opening portion.

Further, the rough-surface opening portion is formed so as to gradually protrude from the upper end and the lower end toward the center in the vertical direction and toward the center in the width direction of the packaging bag, and therefore the packaging bag can be easily opened.

Claims (5)

1. A packaging bag in which a laminated film is folded in parallel at 2 positions so that end portions of the laminated film are butted against each other, and the butted end portions are bonded to each other to form a cylindrical body, and an upper sealing portion and a lower sealing portion for sealing an upper opening portion and a lower opening portion of the cylindrical body are provided,

the 2 folded positions of the laminated film are respectively formed as side edges which are used as boundaries between the front face and the back face of the packaging bag, and the butted end portions are formed at the front of the packaging bagA back sealing part formed by bonding the end parts of the back part side and the back part side with each other to form a certain width

The upper seal portion is composed of a 1 st seal portion and a 2 nd seal portion, the 1 st seal portion sealing the front surface portion and the back surface portion relatively deeply from an upper end in a vertical direction within a predetermined range in a width direction of the packaging bag over the back seal portion from the one side edge portion, the 2 nd seal portion sealing the front surface portion and the back surface portion relatively shallowly from the upper end in the vertical direction from a depth of the 1 st seal portion in a range between the 1 st seal portion and a side edge portion opposite to the one side edge portion,

a rough surface opening portion composed of an aggregate of a plurality of fine recessed portions and a plurality of fine through holes is provided on the 1 st seal portion in the front surface portion and/or the back surface portion so as to include one of the side edge portions,

an intermediate rough surface portion composed of an aggregate of a plurality of fine recesses and a plurality of fine through holes is provided on a bottom portion of a surface of the back seal portion facing the other side edge portion of the back surface portion, the recesses are formed on an outer layer constituting the laminate film, and the through holes penetrate the outer layer.

2. The packaging bag according to claim 1, wherein the rough-surface opening part is formed so as to gradually protrude from an upper end and a lower end thereof toward a center in a width direction of the packaging bag as approaching a center in a vertical direction.

3. The packaging bag according to claim 1, wherein the rough-surface opening portion is provided with a portion in which the density of the concave portions is relatively sparsely formed along a peripheral edge of the rough-surface opening portion.

4. The packaging bag according to claim 1, wherein the rough surface opening portion is provided with a portion in which the depth of the recess is formed relatively shallowly along a peripheral edge of the rough surface opening portion.

5. The packaging bag according to claim 1, wherein the rough-surface opening portion is provided with a portion in which the size of the concave portion is relatively small along a peripheral edge of the rough-surface opening portion.