JP2006137445A - Easily unsealable packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily unsealable packaging bag which can be simply cut off and unsealed along a cut line on the wall face of the packaging bag by releasing a pressure-sensitive adhesive tape, and is excellent in gas barrier properties. <P>SOLUTION: The easily unsealable packaging bag is a bag with a flexible wall face composed of a laminated body having a substrate layer, an aluminum foil layer and a heat adhesive resin layer, and has a constitution wherein the cut line for unsealing penetrating through only the substrate layer of the laminated body and having a specified shape is formed, and the pressure-sensitive adhesive tape with a tab part is stuck on the wall face of the bag from the external face so as to cover at least a part of the cut line. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  According to the present invention, an adhesive tape that covers and covers at least a part of a score line is peeled from the wall surface of the bag, whereby a laminate constituting the bag is cut along the score line to easily form an opening in the bag. The present invention relates to an easy-open packaging bag having excellent gas barrier properties.

Conventionally, as a packaging bag in which an opening can be formed by cutting a wall portion of a bag, for example, one sealed end portion sealed by thermal welding as described in Japanese Patent No. 3400456 is used. A series of sewing machines which are spaced apart from each other to define a horizontally elongated rectangular boundary on one wall of a flexible container which is substantially a bag and which extends close to and parallel to the sealed end Resealable cover having a structure in which a die cut region formed by a line of sight, that is, a die cut region, is provided, and a label having a non-adhesive end that serves as a handle is attached to the die cut region. (For example, refer patent document 1) which has this.
Japanese Patent No. 3400456

  However, in the container having the re-sealable cover described above, a configuration in which a pressure-sensitive adhesive label is attached to cover a die cut area formed of a perforation line formed so as to penetrate the wall of the container. Therefore, it is unavoidable that the gas barrier property is lowered due to the perforation line formed so as to penetrate the wall portion of the container, and cannot be used as a container for packaging contents that require the gas barrier property. Have.

  The object of the present invention is to grasp the grip portion of the adhesive tape and peel it from the packaging bag, thereby cutting the wall surface of the packaging bag along the score line and opening it easily to form an opening. It is an object of the present invention to provide an easy-open packaging bag excellent in gas barrier property without causing deterioration in gas barrier property due to formation.

  A cut line having a predetermined shape is formed on a wall surface of a packaging bag having a flexible wall surface made of a laminate including a base material layer, an aluminum foil layer, and a heat-adhesive resin layer, and covers at least a part of the cut line. In the packaging bag by which the adhesive tape which has a knob part was stuck on the wall surface of the packaging bag, it is an easily openable packaging bag of the structure formed so that the said cut line might penetrate only the base material layer of a laminated body.

  In the above-described easy-open packaging bag, the cut line is an elongated rounded rectangular shape extending in the left-right direction formed in a broken line shape, and at least one end portion is covered and the knob is adjacent to the side end of the packaging bag It is the structure to which the adhesive tape was stuck so as to do.

  In the above-described easy-open packaging bag, the cut line is a U-shape facing in the left-right direction, covers the entire cut line, and the adhesive tape is positioned so that the knob is positioned on the curved portion side of the U-shape. It is a stuck configuration.

  In the above easy-open packaging bag, the adhesive tape has an adhesive strength to the wall surface of the packaging bag of 100 g / 20 mm or more (JIS Z-0237 180 ° C. peeling), and the thermal adhesive resin layer has a tensile strength of 30 MPa. (JIS K-7127) The configuration is as follows.

  Said easily openable packaging bag WHEREIN: The said packaging bag is the structure which is a gusset bag which has a V-shaped folding part in the left-right both ends or a pillow type bag.

  By adopting the configuration of the present invention, when the adhesive tape attached to the wall surface is grasped and peeled off, the wall surface of the packaging bag surrounded by the cut line can be cut off in a state of being adhered to the adhesive tape. Therefore, it is possible to form an opening for easily opening the packaging bag and taking out the contents. In addition, the score line is formed so as to penetrate only the base material layer of the laminate composed of the base material layer, the aluminum foil layer, and the heat-adhesive resin layer, and the location of the score line formed in the base material layer is aluminum. Since it is covered with a foil layer and a heat-adhesive resin layer, it is possible to prevent deterioration of the gas barrier property of the packaging bag due to the formation of a score line, and an easy-open packaging bag with excellent gas barrier properties. can do.

  In the invention which concerns on Claim 2, the wall surface of a packaging bag can be cut off along a cut line, and the elongate round-round rectangular opening can be formed easily.

  In the invention which concerns on Claim 3, the wall surface of a packaging bag is cut off along a score line, and the opening of the shape which extended the U-shaped opening or the U-shaped linear part can be formed easily.

  In the invention according to claim 4, when the adhesive tape is peeled off, the adhesive tape is not peeled off from the packaging bag, and the wall surface of the packaging bag is pulled while being adhered to the adhesive tape, and the cut line is covered at the edge of the score line and laminated. The formed aluminum foil layer and the heat-adhesive resin layer can be broken and torn along the score line.

  In the invention which concerns on Claim 5, an opening can be easily formed in a pillow type bag or a gusset bag.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a plan view showing a first embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view taken along the line II of FIG. 1, and FIG. 3 is a plan view showing an upper half of the first embodiment in the middle of opening, FIG. FIG. 5 is an enlarged cross-sectional view corresponding to FIG. 2 obtained by cutting the laminate of the first embodiment along a cut line, FIG. 5 is a plan view showing the upper half of the second embodiment of the present invention, and FIG. It is a top view which shows the upper half part of 3 embodiment, 2 is a palm heat-bonding part, 3 is an edge thermal bonding part, 4,4 'is a score line, 5,5' is an adhesive tape, 5a, 5a ' Is a knob part, 51 is an adhesive tape substrate layer, 52 is an adhesive layer, 6 is an opening, 10 is a laminate, 11 is a substrate layer, 12 is an aluminum foil layer, and 13 is a heat-adhesive resin layer.

  The first embodiment of the present invention is as shown in FIGS. As shown in FIG. 1, the planar shape is composed of a laminate 10 including a base material layer 11, an aluminum foil layer 12, and a heat-adhesive resin layer 13. Is a pillow-type bag formed by the above, a horizontally long rounded rectangular broken line cut line 4 is formed on the wall surface on which the palm heat-bonding portion 2 is not formed so as to be orthogonal to the palm-shell heat bonding portion 2; An adhesive tape 5 covering the entire cut line 4 and having a knob 5a at one end is attached to the outer surface of the wall surface, and the horizontally long rounded rectangular cut line 4 is cut at the arcuate end. This is a configuration in which the length of is increased. The knob 5a of the adhesive tape 5 is not in an adhesive state without forming an adhesive layer, or the adhesive tape 5 is folded and bonded with the adhesive layer inside by a predetermined width to be in an adhesive-free state. Is.

  The cross-sectional configuration of the part where the cut line 4 is formed and the adhesive tape 5 is attached so as to cover the cut line 4 is as shown in FIG. 2, and the cut line 4 is bonded to the base material layer 11 and the aluminum foil layer 12 by thermal bonding. The laminate 10 is formed so as to penetrate only the base material layer 11 of the laminate 10, and the score line 4 is configured to be covered with the aluminum foil layer 12 and the thermal adhesive resin layer 13. Since the cut line 4 penetrating the base material layer 11 is covered with the aluminum foil layer 12 and the heat-adhesive resin layer 13, there is no deterioration in gas barrier property due to the formation of the cut line 4, and the packaging bag has excellent gas barrier property. can do. Further, the aluminum foil layer 12 covering the score line 4 penetrating the base material layer 11 has a low tensile strength, so it is easy to tear, and the thermal adhesive resin layer 13 has a tensile strength of 30 MPa (JIS K-7127) or less and has a tensile strength. Since the adhesive tape 5 adhered to the surface of the laminate 10 is peeled off, the aluminum foil layer 12 and the heat-adhesive resin layer 13 are broken at the location of the score line 4 and along the score line 4. The laminate 10 can be torn.

  In the end part where the length of the cut line 4 is lengthened by grasping the knob part 5a and tearing off the adhesive tape 5 in the lateral direction, the base material at the end part of the cut line 4 is lengthened. Since the layer 11 is easily broken and the aluminum foil layer 12 and the heat-adhesive resin layer 13 laminated on the base material layer 11 are broken as shown in FIG. 4, the adhesive tape 5 is cut as shown in FIG. The laminated body 10 in a region surrounded by the score line 4 is cut off in a state where the adhesive layer 52 is bonded to the surface of the adhesive layer 52 to form an opening 6. In the case of the first embodiment, the laminated body 10 constituting the wall surface of the packaging bag is broken along the cut line 4 and cut and removed to form a rounded rectangular opening 6 to take out the contents. it can. Moreover, when the adhesive tape 5 is peeled and the laminated body 10 in the area surrounded by the cut line 4 is cut off, the peeling is stopped, whereby the peeled adhesive tape 5 is returned to the original and the opening 6 is formed in the packaging bag. Can be sealed again.

  The planar shape of the second embodiment of the present invention is as shown in FIG. 5, and compared with the first embodiment, the pressure-sensitive adhesive tape has a knob portion 5 a ′ covering only one end portion of the score line 4. The configuration is basically the same as that of the first embodiment except that 5 'is different in that it is attached to the outer surface of the wall surface. Also in the second embodiment, the laminate 10 in the region where the adhesive tape 5 'is adhered is cut off by grasping the knob 5a' and peeling off the adhesive tape 5 'in the lateral direction. By pulling 5 ', the laminated body 10 constituting the wall surface of the packaging bag can be broken and cut along the cut line 4. By removing the cut laminated body 10, the cut line 4 is formed on the wall surface of the packaging bag. Can be formed.

  The planar shape of the third embodiment of the present invention is as shown in FIG. 6 and is composed of a laminate including a base material layer, an aluminum foil layer, and a heat-adhesive resin layer. A pillow-type bag formed by the edge thermal bonding portion 3 and having a horizontally long U-shaped broken line 4 ′ perpendicular to the palm thermal bonding portion 2 on a wall surface where the palm thermal bonding portion 2 is not formed. Is formed at a position adjacent to the side edge of the packaging bag, and the adhesive tape 5 'covering the entire cut line 4' and having the knob part 5a 'is the knob part 5a' is the curve part side of the cut line 4 '. It is affixed to the outer surface of the wall surface so that the cut line 4 ′ has a long cut length at the curved portion.

  Also in the third embodiment, the length of the cut line 4 ′ is increased by grasping the knob 5a ′ and peeling off the adhesive tape 5 ′ in the lateral direction. Thus, the laminated body is broken, and the laminated body is broken along the cut line 4 ′ to form a horizontal U-shaped opening. When the adhesive tape 5 ′ is peeled to form an opening having the same shape as the score line 4 ′, the peeling is stopped and the adhesive tape 5 ′ is returned to its original position, whereby the lateral U-shaped opening can be resealed. Further, after forming the horizontal U-shaped opening, the peeling of the adhesive tape 5 ′ is further continued and the peeling is stopped at an arbitrary position, so that the cut line 4 ′ can be removed even in the region where the cut line is not formed. It is possible to break the laminate in the extending direction of the straight line portion and cut it to form a horizontal U-shaped opening that extends in the left-right direction extending in the extending direction of the straight line portion of the cut line 4 ′.

  In the first to third embodiments, it is preferable that the width of the rounded rectangular shape or the U-shaped score line is about 3 to 30 mm. If the width of the cut line is narrower than 3 mm, the area of the region surrounded by the cut line that adheres to the adhesive tape is reduced, and the force for tearing the laminate when the adhesive tape is peeled off is not preferable. Conversely, it is optional to make the width of the score line larger than 30 mm so as to be suitable for the use of the packaging bag, but when the width of the score line is widened, the area of the adhesive tape that covers and sticks to the score line is increased. Therefore, it is difficult to perform the operation of attaching the adhesive tape to the outer surface of the packaging bag, and it is not preferable from the viewpoint of cost. Moreover, although the shape of the packaging bag is a flat pillow type bag, it may be a gusset pillow type bag having inward gusset folding portions at both ends. Moreover, it is good also as a packaging bag which has a gusset folding part of the structure which inserted the V-shaped folding piece into the both ends of the laminated body of 2 sheets of front and back, and heat-bonded the 4 side edge parts by predetermined width. In the case of a packaging bag having inward V-shaped folds on both sides as described above, there is no appropriate means for tearing and opening the packaging bag in the left-right direction. The easy-open packaging bag is particularly effective in the case of a gusset pillow type bag or a packaging bag having a V-shaped fold on both sides.

  The shape of the score line is not particularly limited, but is preferably a closed loop shape or a U-shape for forming an opening in the bag, and the size and shape depends on the size and shape of the opening to be formed. It can be decided arbitrarily. The cut line is preferably a broken line, the straight line part of the cut line is made relatively short in the length of the broken line cut line, and the curved line part is made along the cut line by making the broken line cut length relatively long. It is easy to break the base material layer. It is necessary to use a tape with a high adhesive strength, and as a result, the force that pulls the wall surface of the packaging bag by the adhesive strength when peeling the adhesive tape increases, so it is laminated along the score line. It becomes possible to break the aluminum foil and the heat-adhesive resin layer which are laminated so as to cover the base material layer and the cut line. The adhesive tape knob may be the state of the adhesive tape base material without applying adhesive to the adhesive tape base material, or the adhesive tape may be folded and bonded to the adhesive layer with the adhesive layer inside to form the knob part. Good.

  As the base material layer 11 of the laminate 10, a single or laminated body of a plastic film such as biaxially stretched polyethylene terephthalate (PET), biaxially stretched nylon (ON), biaxially stretched polypropylene (OPP), and the films A paper laminate can be used. As the heat-adhesive resin layer 13, low-density polyethylene, linear low-density polyethylene, an ethylene-α olefin copolymer polymerized using a metallocene catalyst, or the like can be used. In order to tear along the score line with the adhesive tape, the thermal adhesive resin layer needs to have a tensile strength of 30 MPa (JIS K-7127) or less, and the thickness of the thermal adhesive resin layer is 15 to It becomes about 40 μm.

Laminating the base material layer, the intermediate layer, and the heat-adhesive resin layer of the laminate can be performed by dry lamination (DL) using a urethane-based adhesive or extrusion lamination (EC) using polyethylene. As the structure of the laminate, for example, PET / aluminum foil (AL) / LDPE, ON / AL / LDPE, OPP / AL / LDPE, PET / ON / AL / LDPE, PET / OPP / AL / LDPE, paper / PET / AL / LDPE, PET / paper / AL / LDPE, etc. A score line is formed in the underlined layer that becomes the base material layer.

  As a method of producing a laminate having a score line, a base material layer made of a plastic film on which a pattern is printed, or a base material layer in which another plastic film or paper is laminated on the printing surface of a plastic film on which a design is printed After forming the cut line, a predetermined closed loop or U-shaped cut line is formed at a predetermined position with a cutting blade in alignment with the pattern printed on the base layer, and the base layer formed with the cut line is made of aluminum. It can be produced by laminating a foil and a heat-adhesive resin layer. When the base material layer is made of a single plastic film, when printing the plastic film using a gravure rotary printing machine, etc., it is used to form score lines on the surface of the plate cylinder using one unit of the printing machine. By attaching a cutting blade, it is possible to form a score line in printing and in-line.

The top view which shows 1st Embodiment of this invention. FIG. 2 is an enlarged sectional view taken along line II in FIG. 1. The top view which shows the upper half part in the middle of opening of 1st Embodiment. The expanded sectional view corresponding to Drawing 2 which cut off the layered product of a 1st embodiment by a cut line. The top view which shows the upper half part of 2nd Embodiment of this invention. The top view which shows the upper half part of 3rd Embodiment of this invention.

Explanation of symbols

2 Joint heat bonding part 3 Edge heat bonding part 4, 4 'Cut line 5, 5' Adhesive tape 5a, 5'a Knob part 6 Opening
51 Adhesive tape substrate layer
52 Adhesive layer
10 Laminate
11 Base material layer
12 Aluminum foil layer
13 Thermal adhesive resin layer

Claims (5)

A cut line having a predetermined shape is formed on a wall surface of a packaging bag having a flexible wall surface made of a laminate including a base material layer, an aluminum foil layer, and a heat-adhesive resin layer, and covers at least a part of the cut line. In a packaging bag in which a pressure-sensitive adhesive tape having a knob is attached to the wall surface of the packaging bag, the easy-open property is characterized in that the cut line is formed so as to penetrate only the base material layer of the laminate. Packaging bag. The cut line is a long and narrow rounded rectangular shape formed in a broken line shape, and has a configuration in which an adhesive tape is attached so as to cover at least one end portion and a knob portion is adjacent to a side end of the packaging bag. The easy-open packaging bag according to claim 1. The cut line is U-shaped, and has a configuration in which an adhesive tape is attached so that the entire cut line is covered and the knob is located on the curved part side of the U-shape. Item 10. An easy-open packaging bag according to item 1. The adhesive tape has an adhesive strength to the wall of the packaging bag of 100 g / 20 mm (JIS Z-0237 180 ° C. peeling) or more, and a tensile strength of the thermal adhesive resin layer is 30 MPa (JIS K-7127) or less. The easy-open packaging bag according to any one of claims 1 to 3. The easy-open packaging bag according to any one of claims 1 to 4, wherein the packaging bag is a pillow type bag or a gusset bag having V-shaped folded portions at both left and right ends.

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