JP2001294248A - Easy-to-open packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy-to-open packaging bag on which a cut line can be simply formed and which is excellent in tear properties. SOLUTION: The easy-to-open packaging bag comprises a three-sided-fin- sealed bag formed with opposite side rim thermally adhered portions, a three- sided-fin-sealed bag, a self-supporting bag or a pillow-type bag formed of a hutt-seamed thermally adhered portion and an end rim thermally adhered portion comprising a laminate film including an external layer and a thermally adhesive resin layer or a laminate film including an external layer, an intermediate layer and a thermally adhesive resin layer. The cut line comprising flaws is formed on the external layer or the thermally adhesive resin layer of the laminate film over a full length in a direction at the right angle with the side rim thermally adhered portions or the end rim thermally adhered portion, while cuts are formed on the side rim thermally adhered portions at both ends of the cut line. Alternatively, the end rim thermally adhered portion is trimmed by a zigzag trimming line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easily-opening packaging bag which can be opened by tearing a straight line at a cut line formed along an opening line.

[0002]

2. Description of the Related Art Conventionally, there has been known an easily-openable packaging bag having a structure in which a continuous linear cut is formed in one layer of a laminated film in a packaging bag made of a multilayer film. However, in the case of a configuration in which a continuous linear cut is formed in one layer of the laminated film, the strength of the packaging bag is reduced or the gas barrier property is reduced because the cut is formed in one layer. In addition, when a cut is made in one layer, a gap is formed between the edges where the cut is formed, or the edges where the cut is formed overlap each other, and the appearance is deteriorated easily. There is a disadvantage that.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide an easily-openable packaging bag which can easily form a score line and has excellent linear tearability.

[0004]

SUMMARY OF THE INVENTION In a packaging bag formed of a laminated film having an outer layer and a thermo-adhesive resin layer and having opposed side edge thermal bonding portions, the total length in a direction perpendicular to the side edge thermal bonding portion of the packaging bag. Over the outer layer of the laminated film or a thermoadhesive resin layer, a cut line consisting of a scar is formed, and a cut is formed at the side end heat bonding portions at both ends of the cut line, thereby forming a packaging bag. After manufacturing a laminated film having an outer layer and a thermo-adhesive resin layer for production, a slit line is formed in the outer layer or the thermo-adhesive resin layer of the laminated film in a slitting step, a bag making step, a filling and packaging step, and the like. Therefore, a special step for forming a score line is not required, and an easily-openable packaging bag can be easily manufactured.

[0005] In the above easy-open packaging bag, the score line indicates the depth within the range of the thickness of the outer layer or the heat-adhesive resin layer after forming the laminated film. With the configuration formed in the above, the score line can be easily formed by using a protruding blade on the outer layer of the laminated film or the thermo-adhesive resin layer, so that the manufacturing process can be simplified, and the outer layer or the heat bonding Strength of the packaging bag because it is not a cut line that penetrates the conductive resin layer.
There is no reduction in gas barrier properties. In addition, since the edges of the laminated film do not overlap with each other or a gap does not occur between the edges at the location where the score line is formed, the appearance of the location where the score is formed does not deteriorate, and the design of the packaging bag does not deteriorate. Does not impair.

In the above-described easy-open packaging bag, a plurality of the cut lines are formed adjacent to each other in parallel, so that the cut lines formed on the laminated film on the front side and the back side constituting the packaging bag are formed. Even if the position of the line of sight is slightly shifted, the laminated film can be torn along a plurality of cut lines formed in the laminated film on the front and back.

[0007] In the above easy-open packaging bag, the packaging bag is a pillow-type bag, and a cut line is formed in a direction parallel to the joint palm heat bonding portion, so that the bag is parallel to the joint palm heat bonding portion. Since the packaging film can be opened in the vertical direction by tearing the laminated film, the contents can be easily taken out in the case of the packaging bag of the stick-shaped product.

[0008] In the above easy-open packaging bag, the pillow-type bag is a gusset pillow-type bag having folds at both ends, and a score line is formed at a position inside the inner end of the fold. By doing so, it is possible to tear the packaging bag along the score line at a position inside the inner end of the folding part in parallel with the palm joint thermal bonding part and open it greatly in the vertical direction, so that a relatively large individual package was packed. Even in the case of a packaging bag in which the contents are packaged, the contents can be extremely easily taken out because the packaging bag can be opened greatly in the vertical direction.

In the above easy-open packaging bag, the cut is a zigzag cutting line formed in a direction perpendicular to the score line, so that the pillow type bag is filled with the contents and the edge is thermally bonded. By forming the shape of the cutting blade in a zigzag shape when cutting after forming and sealing the part, the zigzag cutting line can be used as a cut, so it is possible to eliminate the trouble of forming the cut in a separate process. it can.

In the above easy-open packaging bag, the laminated film is provided with an intermediate layer between the outer layer and the heat-adhesive resin layer, thereby providing a packaging bag having excellent pinhole resistance, gas barrier properties and strength. Therefore, it can be used as an easy-open packaging bag suitable for liquid packaging, vacuum packaging, and high-temperature heat sterilization.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view of a first embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view taken along a line II in FIG. 1, FIG. 3 is a cross-sectional view corresponding to FIG. 2 of a second embodiment of the present invention, and FIG. FIG. 5 is a sectional view corresponding to FIG. 2 of a third embodiment of the invention, FIG. 5 is a schematic view showing a method of forming a scar on a laminated film, FIG. 6 is a plan view showing a fourth embodiment of the invention, and FIG. FIG. 8 is a plan view showing a fifth embodiment of the present invention, FIG. 8 is an enlarged sectional view taken along the line II in FIG. 7, and FIG. 9 is a plan view showing a sixth embodiment of the present invention. Part, 3 is the bottom heat bonded part, 4 is the score line, 5a, 5b is the cut, 6 is the protruding blade, 7 is the metal roll,
8 is a fastener, 10 and 10 'are laminated films, 11 is an outer layer,
12 is an intermediate layer, 13 is a thermo-adhesive resin layer, 14 is a jointed thermo-adhesive part,
Reference numeral 15 denotes an edge heat bonding portion, and reference numeral 16 denotes a folded portion.

In the first embodiment of the present invention, as shown in FIGS. 1 and 2, two square-shaped laminated films 10 each having an outer layer 11, an intermediate layer 12, and a thermo-adhesive resin layer 13 laminated thereon are heat-treated. By laminating the adhesive resin layer 13 surfaces and folding the lower edge inward in a V-shape to form the bottom thermal bonding portion 3, and forming the side edge thermal bonding portions 2a and 2b opposed to both sides. In the self-supporting bag thus produced, a score line 4 is formed in a direction orthogonal to the side end thermal bonding portions 2a and 2b along a scheduled opening line parallel to the upper portion of the bag. A cut 5a and a cut 5b are formed in the heat bonding portion 2a and the side end heat bonding portion 2b, respectively. As shown in FIG. 2, the cross-sectional shape of the portion where the score line 4 is formed corresponds to the outer layer 11 of the front and back laminated film 10 composed of the outer layer 11, the intermediate layer 12, and the heat-adhesive resin layer 13 constituting the bag. A score line 4 having a depth within the range of the thickness of the outer layer 11 is formed, and the respective score lines 4 are vertically overlapped.

FIG. 3 shows a cross-sectional shape of a portion where the score line 4 is formed according to the second embodiment of the present invention, and a laminated film 10 ′ is formed by laminating an outer layer 11 and a heat-adhesive resin layer 13. Except for being different in that it has a two-layer configuration, the configuration in which the score line 4 having a depth within the range of the thickness of the outer layer 11 is formed in the outer layer 11 of the laminated film 10 'is the first type. This is the same as the embodiment. In the second embodiment, a cut line having a depth within the range of the thickness of the heat-adhesive resin layer 13 is formed on the heat-adhesive resin layer 13 of the laminated film 10 ′ including the outer layer 11 and the heat-adhesive resin layer 13. It is also possible to adopt a configuration in which:

The cross-sectional shape of the portion where the score line 4 is formed in the third embodiment of the present invention is as shown in FIG.
11, a laminated film 10 in which an intermediate layer 12 and a thermo-adhesive resin layer 13 are laminated, and a depth within a range of the thickness of the thermo-adhesive resin layer 13 to the thermo-adhesive resin layer 13 constituting the laminated film 10 The shape and the like of the packaging bag are the same as those of the first embodiment except that the score line 4 having the following is formed.

A fourth embodiment of the present invention is a four-side seal bag as shown in FIG.
A linear score line 4 is formed over the entire width in a direction orthogonal to 2a and 2b, and the side end thermal bonding portions at both ends of the score line 4 are formed.
Cuts 5a and 5b are respectively formed in 2a and 2b, and a plastic fastener 8 is attached inside the cut line 4 in parallel with the cut line 4. In the fourth embodiment, the outer layer 11
Laminated film 10 consisting of an intermediate layer 12 and a heat-adhesive resin layer 13
Or the laminated film 1 composed of the outer layer 11 and the heat-adhesive resin layer 13
0 'can be used, and the score line 4 is the outer layer 1 of the laminated films 10, 10'.
It can be formed on one surface or on the surface of the thermo-adhesive resin layer 13.
In the first to fourth embodiments, the score lines 4 are formed one by one on each of the laminated films 10 and 10 ′ on the front side and the back side constituting the packaging bag.
A configuration in which a plurality of cut lines 4 are formed adjacent to each other in parallel may also be used. The distance between adjacent cut lines is 1.0 to 3.0 m
m is preferable, and if it is 1.0 mm or less, there is a possibility that adjacent cut lines may overlap, and if it is 3.0 mm or more, tearing and unsealing properties when the positions of the front and back cut lines are shifted are deteriorated. By forming a plurality of parallel score lines 4 adjacent to each other as described above, even if the positions of the score lines formed in the front and back side laminated films are slightly shifted, the tearability of the packaging bag can be improved. It doesn't get worse.

A fifth embodiment of the present invention is a pillow-type bag formed by a thermal bonding portion 14 and a thermal bonding portion 15 at the side end, as shown in FIG. In this configuration, two score lines 4 are formed at predetermined intervals in parallel with the thermal bonding portion 14. No notch is formed at both ends of the score line 4, and a zigzag cutting line at the edge serves as a notch. The zigzag cutting line extends along the score line 4 from the location of the zigzag cutting line. The packaging bag can be easily torn open.

As shown in FIG. 8, the cross-sectional shape of the portion where the score line 4 is formed in the fifth embodiment is the laminated film on the back side provided with the jointed thermal bonding portion 14 forming the pillow type bag and the opposite side. The two cut lines are formed adjacent to the laminated film on the front side of. With this configuration, the pillow-type bag can be easily torn along the score line 4 and opened even when the score lines 4 formed on the front and back laminated films are slightly shifted laterally without completely overlapping. can do.

As shown in FIG. 9, the gusset according to the sixth embodiment of the present invention has a gusset formed by a thermal bonding portion 14 and a thermal bonding portion 15 at the side edges and having inwardly bent portions 16 at both side ends. It is a pillow type bag, and has a configuration in which a score line 4 is formed in a position inside the inner end of the folded portion 16 on one side in parallel with the thermal bonding portion 14. By adopting this configuration, the gusset pillow-type bag can be opened greatly in the vertical direction by tearing the gusset pillow-type bag along the score line 4, so that even in the case of a gusset pillow-type bag in which relatively large individually packaged contents are packaged. It is extremely easy to remove the contents. In the sixth embodiment, a configuration in which a plurality of score lines are formed may be adopted. Also in the fifth and sixth embodiments, a laminated film 10 composed of the outer layer 11, the intermediate layer 12, and the thermo-adhesive resin layer 13 or a laminated film 10 'composed of the outer layer 11 and the thermo-adhesive resin layer 13 can be used. 4 can be formed on the outer layer 11 surface of the laminated films 10 and 10 'or the heat-adhesive resin layer 13 surface.

In the first to sixth embodiments, the depth of the score line 4 composed of scars formed on the outer layer 11 or the heat-adhesive resin layer 13 of the laminated films 10 and 10 ′ depends on the outer layer 11 or the heat-adhesive resin. It may be formed to any depth within the range of the thickness of the layer 13, but is preferably set to a depth of １ ／ or ／ of the thickness of the outer layer 11 or the thermoadhesive resin layer 13. Also, the score lines 4 are formed so as to overlap with the laminated films on the front side and the back side constituting the packaging bag, respectively, but the configuration is such that the score lines are formed only on the laminated film on the back side of the packaging bag. You can also. In that case, since the score line 4 is not visible from the front side, the design of the packaging bag is not impaired.

As a method of forming the score line 4 composed of a scar on the outer layer 11 or the thermo-adhesive resin layer 13 of the laminated films 10 and 10 ', a laminated film comprising the outer layer 11, the intermediate layer 12, and the thermo-adhesive resin layer 13 is used. After laminating a laminated film 10 ′ composed of 10 or the outer layer 11 and the heat-adhesive resin layer 13, for example, in the case of the first embodiment, as shown in FIG. By causing the protruding blade 6 to contact the surface of the outer layer 11 of the laminated film 10 with a constant weight while running along the same, the score line 4 composed of a scar can be formed on the surface of the laminated film 10. The depth of the score line 4 can be changed by the load applied to the protruding blade 6. Further, the height of the protruding blade 6 is adjusted to the thickness of the outer layer 11 or the thickness of the thermo-adhesive resin layer 13 by using a notch line forming apparatus capable of finely adjusting the height of the protruding blade 6 protruding from the reference surface. It is also possible to form a score line having an arbitrary depth by adjusting the range.

As the base layer 11 constituting the laminated films 10, 10 ', biaxially stretched polyethylene terephthalate (PE)
T) Biaxially oriented polypropylene (OPP), biaxially oriented nylon (ON), metal oxide deposited biaxially oriented polyethylene terephthalate (VMPET) and the like can be used. Middle class
12 include aluminum foil (AL), ethylene-vinyl alcohol copolymer (EVOH), biaxially stretched polyethylene terephthalate (PET), and biaxially stretched nylon (O
N), aluminum-deposited biaxially stretched polyethylene terephthalate (ALVMPET), metal oxide-deposited biaxially stretched polyethylene terephthalate (VMPET), metal oxide-deposited biaxially stretched nylon (VMON), and the like can be used. As the heat-adhesive resin layer 13, low-density polyethylene (LDP
E), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), unstretched polypropylene (C
PP), ethylene-vinyl acetate copolymer (EVA), aluminum-deposited unstretched polypropylene (VMCPP), and the like. The outer layer 11, the intermediate layer 12, and the heat-adhesive resin layer 13 are formed by dry lamination using a urethane-based adhesive (D
L) or lamination by extrusion lamination (EC) of polyethylene, but lamination by dry lamination is preferred because the laminated films 10, 10 'are easily torn.

The laminated film 10 ′ having a two-layer structure composed of the outer layer 11 and the heat-adhesive resin layer 13 includes OPP / DL / CP
P, OPP / EC / CPP, OPP / DL / LLDP
E, OPP / DL / VMCPP, PET / DL / LLD
PE, PET / EC / LLDPE, PET / DL / VM
CPP, ON / DL / LLDPE, ON / DL / CP
P, ON / EC / LLDPE, etc., and a cut line having an arbitrary depth within the thickness range is formed in the underlined outer layer of the laminated film. When CPP is used as the heat-adhesive resin layer 13, the heat-adhesive resin layer 13 may be formed with a score line.

The three-layer laminated film 10 ′ composed of the outer layer 11, the intermediate layer 12, and the heat-adhesive resin layer 13 is made of PET / E
C / AL / DL / LLDPE, PET / DL / AL / D
L / CPP, PET / DL / VMPET / DL / LLD
PE, PET / DL / VMPET / DL / CPP, PE
T / DL / ALVMPET / DL / CPP, PET / D
L / EVOH / DL / LLDPE, PET / DL / ON
/ DL / CPP, OPP / EC / AL / EC / LLDP
E, OPP / DL / AL / DL / CPP, OPP / DL
/ VMPET / DL / CPP, OPP / DL / ALVM
PET / DL / CPP, PET / EC / AL / EC / L
LDPE, PET / DL / VMPET / DL / LLDP
E, PET / DL / VMPET / DL / CPP, PET
/ DL / ALVMPET / EC / LLDPE, PET /
DL / EVOH / DL / LLDPE, PET / DL / O
N / DL / LLDPE, ON / EC / AL / EC / LL
DPE, ON / DL / VMPET / DL / CPP, ON
/ DL / ALVMPET / DL / LLDPE, ON / D
L / ALVMPET / EC / LLDPE, ON / DL /
EVOH / DL / LLDPE and the like. Laminated film 1
A cut line having an arbitrary depth within the thickness of the outer layer is formed in the outer layer underlined with 0 '. When the heat-adhesive resin layer is CPP, a cut line may be formed in the heat-adhesive resin layer.

Example 1 A pattern was printed by gravure printing on the silicon oxide deposition layer surface of a biaxially stretched polyethylene terephthalate film on which a silicon oxide deposition layer having a thickness of 12 μm was formed, and a urethane-based adhesive was used on the pattern printing surface. A 15 μm-thick biaxially stretched nylon film, and further apply 60 μm to the biaxially stretched nylon film surface.
A μ-thick unstretched polypropylene film was laminated by dry lamination to produce a laminated film. Next, on the biaxially stretched polyethylene terephthalate film surface of the produced laminated film, a linear scar in the flow direction is formed at a predetermined position in register with the printed picture layer in the flow direction, 2/3 of the thickness of the biaxially stretched polyethylene terephthalate film. Formed to reach a depth of. Two laminated films, each having a score line formed by the scratches formed above, are overlapped with each other so that the positions of the score lines coincide with each other, and the score line is brought to the expected opening position of the packaging bag by a conventional bag making method. Then, a self-supporting bag in which a cut was formed in the side end heat bonding portion shown in FIG. 1 was produced. The resulting self-supporting bag could be easily opened by tearing the bag from the cut portion to tear the laminated film constituting the bag straight.

[0025]

According to the present invention, in a packaging bag formed of a laminated film having an outer layer and a thermo-adhesive resin layer and formed with opposed side edge thermal bonding portions, the laminated film extends over the entire length in a direction perpendicular to the side edge thermal bonding portion of the packaging bag. The outer layer or the heat-adhesive resin layer is formed with a cut line formed of a scar, and a cut is formed at both side end heat bonding portions of the cut line to form a packaging bag. After manufacturing a laminated film having an outer layer and a heat-adhesive resin layer, a slit line, a bag-making step, a filling and packaging step, etc. can form a score line in the outer layer or the heat-adhesive resin layer of the laminated film. , Without the need for a special process for forming the score line,
An easily openable packaging bag can be easily manufactured.

In the above easy-open packaging bag, the score line indicates the depth of the outer layer or the heat-adhesive resin layer within the range of the thickness of the outer layer or the heat-adhesive resin layer after the laminated film is produced. With the configuration formed in the above, the score line can be easily formed by using a protruding blade on the outer layer of the laminated film or the thermo-adhesive resin layer, so that the manufacturing process can be simplified, and the outer layer or the heat bonding Strength of the packaging bag because it is not a cut line that penetrates the conductive resin layer.
There is no reduction in gas barrier properties. In addition, since the edges of the laminated film do not overlap with each other or a gap does not occur between the edges at the location where the score line is formed, the appearance of the location where the score is formed does not deteriorate, and the design of the packaging bag does not deteriorate. Does not impair.

In the above easy-open packaging bag, a plurality of the cut lines are formed adjacent to each other in parallel, so that the cut lines formed on the laminated film on the front side and the back side constituting the packaging bag. Even if the position of the line of sight is slightly shifted, the laminated film can be torn along a plurality of cut lines formed in the laminated film on the front and back.

[0028] In the above easy-open packaging bag, the packaging bag is a pillow type bag, and a cut line is formed in a direction parallel to the palm joint thermal bonding portion, so that the bag is parallel to the palm joint thermal bonding portion. Since the packaging film can be opened in the vertical direction by tearing the laminated film, the contents can be easily taken out in the case of the packaging bag of the stick-shaped product.

In the above easy-open packaging bag, the pillow-type bag is a gusset pillow-type bag having folds at both ends, and a score line is formed at a position inside the inner end of the fold. By doing so, it is possible to tear the packaging bag along the score line at a position inside the inner end of the folding part in parallel with the palm joint thermal bonding part and open it greatly in the vertical direction, so that a relatively large individual package was packed. Even in the case of a packaging bag in which the contents are packaged, the contents can be extremely easily taken out because the packaging bag can be opened greatly in the vertical direction.

In the above easy-open packaging bag, the cut is a zigzag cutting line formed in a direction perpendicular to the cut line, so that the pillow type bag is filled with the contents and the edge is thermally bonded. By forming the shape of the cutting blade in a zigzag shape when cutting after forming and sealing the part, the zigzag cutting line can be used as a cut, so it is possible to eliminate the trouble of forming the cut in a separate process. it can.

[0031] In the above easy-open packaging bag, the laminated film is provided with an intermediate layer between the outer layer and the heat-adhesive resin layer, thereby providing a packaging bag having excellent pinhole resistance, gas barrier properties and strength. Therefore, it can be used as an easy-open packaging bag suitable for liquid packaging, vacuum packaging, and high-temperature heat sterilization.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along the line II in FIG.

FIG. 3 is a sectional view corresponding to FIG. 2 of a second embodiment of the present invention.

FIG. 4 is a sectional view corresponding to FIG. 2 of a third embodiment of the present invention.

FIG. 5 is a schematic view showing a method of forming a scar on a laminated film.

FIG. 6 is a plan view showing a fourth embodiment of the present invention.

FIG. 7 is a plan view showing a fifth embodiment of the present invention.

FIG. 8 is an enlarged sectional view taken along the line II in FIG. 7;

FIG. 9 is a plan view showing a sixth embodiment of the present invention.

[Explanation of symbols]

 2a, 2b Side heat bonding part 3 Bottom heat bonding part 4 Cut 5a, 5b Cut 6 Projection blade 7 Metal roll 8 Fastener 10, 10 'Laminated film 11 Outer layer 12 Intermediate layer 13 Thermo-adhesive resin layer 14 15 Edge thermal bonding part 16 Folding part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideo Umehara 10 Uzumasa Senbaicho, Ukyo-ku, Kyoto Dainippon Printing Co., Ltd. (72) Inventor Toshinari Kokuryo 10 Uzumasa Kamibetsucho, Ukyo-ku, Kyoto Dai-Nippon Printing Co., Ltd.F-term (reference) CA04 CA24 EA18 EB05 EB07 FA01 FB07 FC01 3E086 AA23 AC13 AC15 AD01 AD08 BA04 BA15 BB01 BB51 BB90

Claims (7)

[Claims] 1. A packaging bag comprising a laminated film having an outer layer and a thermo-adhesive resin layer and having opposed side edge thermal bonding portions formed thereon, wherein the entire length of the packaging bag is perpendicular to the side edge thermal bonding portion. A cut line made of a scar is formed in the outer layer or the heat-adhesive resin layer of the laminated film, and a cut is formed in the side end heat-bonded portions at both ends of the cut line. Easy-open packaging bag. 2. The score line is formed on the outer layer or the thermo-adhesive resin layer of the laminated film at a depth within a range of the thickness of the outer layer or the thermo-adhesive resin layer after the production of the laminated film. The easy-to-open packaging bag according to claim 1, wherein the packaging bag is configured. 3. The apparatus according to claim 1, wherein a plurality of said cut lines are formed adjacent to each other in parallel.
2. The easily-openable packaging bag according to 1. 4. The packaging bag is a pillow type bag,
The easy-open packaging bag according to any one of claims 1 to 3, wherein the score line is formed in a direction parallel to the joint heat bonding portion. 5. A gusseted pillow-type bag having a pillow-type bag having folds at both ends, wherein the score line is formed at a position inside the inner end of the fold-up. Item 6. An easily openable packaging bag according to Item 4. 6. The easy-open packaging bag according to claim 4, wherein the cut comprises a zigzag cutting line formed in a direction perpendicular to the cut line. 7. The easy-open packaging bag according to claim 1, wherein the laminated film has a structure including an intermediate layer between the outer layer and the heat-adhesive resin layer.