JP5158250B2 - Packaging bag - Google Patents

Description

  The present invention relates to a packaging bag made of a laminate of plastic films, which is easy to open.

  Conventionally, as a bag that has been easily opened by providing a cut, the bag is made of a laminated body in which a surface base material layer, an intermediate layer, and a heat-adhesive resin layer are laminated via an adhesive layer, respectively. An easily openable packaging bag in which a continuous straight cut is formed in the intermediate layer, and a notch is provided at a position where the cut is placed inside at least one of the side edge thermal bonding portions of the bag at both ends of the cut Is known (see, for example, Patent Document 1).

  The easy-open packaging bag has excellent linear openability because the tip of the notch provided in the side edge thermal bonding part is located on a continuous linear cut. And it gives convenience to consumers. On the other hand, when an external force is applied above the linear cut, the packaging bag tends to be bent with the straight cut as an axis. For example, when vacuum-packed and packed with foods such as boiled beans and liquids and sterilized by retort, if the packaging bag falls down due to a step on the packaging line, it will bend around the linear break of the packaging bag When an external force is applied and rarely bends, the surface base material layer may crack when it is bent, and further, the crack may propagate to the thermal adhesive resin layer. In such a state, impacts during transportation of the packaged food are added, which may cause pinholes in the packaging bag and cause deterioration in food quality and occurrence of corruption. This phenomenon is likely to occur especially in winter when the temperature is low.

JP-A-7-285559

  As a result of diligent research, the present inventor found that the tip of the notch provided in the side edge thermal bonding portion is positioned on the straight opening cut line, and thus it is easy to bend, thereby completing the present invention. That is, the present invention is an easily openable packaging bag that prevents bending from a linear opening break and prevents pinholes from occurring in the packaging bag even when an external force is applied to the packaging bag, and does not deteriorate the barrier property. Is to provide.

In order to achieve the above object, the present invention according to claim 1 is a packaging bag comprising a laminate in which a surface base material layer, an intermediate layer, and a thermal adhesive resin layer are sequentially laminated, For linear opening that is continuous with the intermediate layer of the packaging bag in the left-right direction parallel to the upper edge of the packaging bag at a position extending from the outer edge of the thermal bonding portion on the left edge of the packaging bag to the outer edge of the thermal bonding portion on the right edge A left I notch is formed through the left edge thermal bonding portion at a position where a cut is formed and does not reach the inner edge of the left edge thermal bonding portion from the outer edge of the left edge thermal bonding portion, Between the outer edge and the inner edge of the edge thermal bonding portion, on the right side of the left I notch, the left edge is directed to the side that is open with respect to the outer edge of the left edge thermal bonding portion so as not to overlap the left I notch The left-sided “Ku” -shaped cut with the closed side facing the inner edge of the thermal bonding part Relative positions of the opening cut, the left I notch, and the left “cross-shaped” cut in the vertical direction perpendicular to the upper edge of the packaging bag formed through the side edge thermal bonding portion The relationship is such that the closed end of the left-side “K” -shaped cut overlaps with the opening cut, and the left I-notch is positioned below the opening cut. And an extension line parallel to the opening cut at the tip on the inner edge side of the left edge thermal adhesive portion of the left I notch is other than the tip on the closed side of the left “cross-shaped” cut . It is provided in the range which cross | intersects a part .

Further, the present invention according to claim 2 is a packaging bag comprising a laminate in which a surface base material layer, an intermediate layer, and a heat-adhesive resin layer are sequentially laminated, wherein the left-hand edge thermal bonding portion of the packaging bag A linear opening cut continuous to the intermediate layer of the packaging bag is formed in a horizontal direction parallel to the upper edge of the packaging bag at a position extending from the outer edge to the outer edge of the right edge thermal bonding portion, and the right edge heat A right I notch is formed through the right edge thermal bonding portion at a position that does not reach the inner edge of the right edge thermal bonding portion from the outer edge of the bonding portion, and the outer edge and inner edge of the right edge thermal bonding portion are formed. Between the right side I-notch and the right side I-notch, the side that is open with respect to the outer edge of the right-side edge thermal bonding portion is closed to the inner edge of the right-side edge thermal bonding portion. A right-sided "K" shape cut through the right-side edge thermal bonding part The relative positional relationship of the opening cut, the right I notch, and the right “K” shape cut in the vertical direction perpendicular to the upper edge of the packaging bag is the right “K” shape. The right end of the right I notch is in a positional relationship in which the front end portion of the closed side of the cut overlaps with the opening cut and the right I notch is positioned below the opening cut. An extension line parallel to the opening cut at the tip on the inner edge side of the thermal bonding portion is provided at a position where it intersects with a portion other than the tip portion on the closed side of the right-handed “shaped” cut. It is characterized by.

Moreover, this invention of Claim 3 is a packaging bag which consists of a laminated body in which the surface base material layer, the intermediate | middle layer, and the heat bondable resin layer were laminated | stacked one by one, Comprising: A linear opening cut continuous with the intermediate layer of the packaging bag is formed in a lateral direction parallel to the upper edge of the packaging bag at a position extending from the outer edge to the outer edge of the right edge thermal bonding portion, and the left edge heat A left I notch is formed through the left edge thermal bonding portion at a position that does not reach the inner edge of the left edge thermal bonding portion from the outer edge of the bonding portion, and from the outer edge of the right edge thermal bonding portion to the right side. A right I notch is formed through the right edge thermal bonding portion at a position that does not reach the inner edge of the edge thermal bonding portion, and the left I notch is formed between the outer edge and the inner edge of the left edge thermal bonding portion. On the right side, the left side I notch does not overlap with the outer edge of the left edge thermal bonding portion. A left-side “cross-shaped” cut is formed through the left-side edge thermal bonding portion, with the open side facing toward the inner edge of the left-side edge thermal bonding portion, The right edge heat of the right edge heat-adhered portion is directed to the left side of the right edge I notch between the outer edge and the inner edge of the edge heat bonded portion so as not to overlap the right edge I notch with respect to the outer edge of the right edge heat bonded portion. The opening in the up and down direction perpendicular to the upper edge of the packaging bag is formed with a right-sided edge-shaped cut extending through the right edge thermal bonding portion and facing the closed side with respect to the inner edge of the bonding portion The relative position of the left notch, the left I-notch, the right I-notch, the left-side "K" -shaped notch and the right-side "K" -shaped notch is The tip of the closed side of the cut and the tip of the closed side of the right-handed "U" -shaped cut The left I-notch and the right I-notch are positioned below the opening cut, and the left edge thermal bonding portion of the left I notch An extension line parallel to the opening cut at the tip on the inner edge side is provided at a position where it intersects with a portion other than the tip on the closed side of the left-handed “U” shape and the right side I A position where an extension line parallel to the opening cut at the tip on the inner edge side of the right edge thermal bonding portion of the notch intersects with a portion other than the tip on the closed side of the right-handed “shaped” cut. Is provided.

Further, the present invention according to claim 4 is a packaging bag comprising a laminate in which a surface base material layer, an intermediate layer, and a thermoadhesive resin layer are sequentially laminated. A linear opening cut continuous with the intermediate layer of the packaging bag is formed in a lateral direction parallel to the upper edge of the packaging bag at a position extending from the outer edge to the outer edge of the right edge thermal bonding portion, and the left edge heat The left-side edge thermal bond is provided with one end having a wide width at the outer edge position of the bonding portion and the other end of the left-side edge including the other end whose width is concentrated at a position not reaching the inner edge of the left-side edge heat bonding portion. The left edge thermal bonding portion at a position between the outer edge and the inner edge of the left edge thermal bonding portion on the right side of the left cleavage initiation region and not overlapping the left cleavage initiation region. Facing the outer edge of the left edge against the inner edge of the thermal bonding portion A left-side “K” -shaped cut that faces the closed side is formed through the left-side edge thermal bonding portion, and the opening cut and the left-side cut in the vertical direction perpendicular to the upper edge of the packaging bag The relative positional relationship between the crack initiation region and the left "K" -shaped cut is such that the closed end of the left "K" -shaped cut overlaps with the opening cut. The left-side tear initiation region is located below the opening cut and is located at the lower end of the left-side edge thermal bonding portion of the left-side tear initiation region. An extension line parallel to the cut is provided at a position where it intersects with a portion other than the end portion on the closed side of the left-handed "<" shape.

Further, the present invention according to claim 5 is a packaging bag comprising a laminate in which a surface base material layer, an intermediate layer, and a thermoadhesive resin layer are sequentially laminated. A linear opening cut continuous to the intermediate layer of the packaging bag is formed in a horizontal direction parallel to the upper edge of the packaging bag at a position extending from the outer edge to the outer edge of the right edge thermal bonding portion, and the right edge heat The right-side edge thermal bond is provided with one end having a wide width at the position of the outer edge of the bonding portion and the other side of the right-side edge with the other end whose width is concentrated at a position not reaching the inner edge of the right-side edge thermal bonding portion. The right edge thermal bonding portion at a position on the left side of the right tear initiation region between the outer edge and the inner edge of the right edge thermal bonding portion and not overlapping the right tear initiation region. Facing the outer edge of the right edge against the inner edge of the thermal bonding portion A right-sided “bow” -shaped cut that faces the closed side is formed through the right edge thermal bonding portion, and the opening cut and the right cut in the vertical direction perpendicular to the upper edge of the packaging bag The relative positional relationship between the crack initiation region and the right-handed "<" shape is a positional relationship in which the closed end of the right-hand "<" shape is overlapped with the opening-use cut. The right-side tear start region is located below the opening cut and is located at the lower end of the right-side edge thermal bonding portion of the right-side tear start region. An extension line parallel to the cut is provided at a position where it intersects with a portion other than the front end portion on the closed side of the right-handed "<" shape.
Moreover, this invention of Claim 6 is a packaging bag which consists of a laminated body in which the surface base material layer, the intermediate | middle layer, and the thermoadhesive resin layer were laminated | stacked one by one, Comprising: The left edge thermal bonding part of the said packaging bag A linear opening cut continuous with the intermediate layer of the packaging bag is formed in a lateral direction parallel to the upper edge of the packaging bag at a position extending from the outer edge to the outer edge of the right edge thermal bonding portion, and the left edge heat The left-side edge thermal bond is provided with one end having a wide width at the outer edge position of the bonding portion and the other end of the left-side edge including the other end whose width is concentrated at a position not reaching the inner edge of the left-side edge heat bonding portion. The other end of which the width is gathered at a position not reaching the inner edge of the right edge thermal bonding portion. The right side tear start area provided penetrates the right edge thermal bonding part. Formed between the outer edge and the inner edge of the left edge thermal bonding portion and on the outer edge of the left edge thermal bonding portion on the right side of the left tear initiation region at a position that does not overlap the left tear initiation region. A left-sided “cross-shaped” cut is formed through the left-side edge thermal bonding portion, with the open side facing toward the inner edge of the left-side edge thermal bonding portion, The side that is open with respect to the outer edge of the right edge thermal bonding portion is oriented between the outer edge and the inner edge of the edge thermal bonding portion on the left side of the right tear initiation region so as not to overlap the right tear initiation region. A right-sided “bow” -shaped cut is formed through the right-side edge thermal bonding portion and is perpendicular to the upper-end edge of the packaging bag. The opening cut in the vertical direction, the left-side tear start region, the right-side tear start region, and the The relative positional relationship between the cuts on the side "K" shape and the cuts on the right "K" shape is such that the end of the left "K" shape is closed and the right "K". The position where the front end of the closed side of the “L” -shaped cut overlaps with the opening cut, and the left-side cleavage start area and the right-side cleavage start area are located below the opening cut. have a relationship, the left Setsu裂initiation region the left edge heat seal portion of the inner edge side of aggregated the opening for cut the left "dogleg" is parallel extension to the other end of the shaped cut of the It is provided at a position that intersects with a portion other than the front end portion on the closed side, and is parallel to the opening cut at the other aggregated end on the inner edge side of the right edge thermal bonding portion of the right tear initiation region. An extension line crosses a portion other than the tip of the closed side of the right-handed “U” shape cut. It is provided in the position to perform.

In the packaging bag of the present invention, the notch is provided at a position away from the opening cut, and even when an external force is applied to the packaging bag, it is prevented from being bent from the linear opening cut, and a pinhole to the packaging bag is provided. Generation | occurrence | production is prevented and there exists an effect that barrier property does not fall .

In addition, the packaging bag is opened from the notch by forming the “edge” -shaped cut at the side edge thermal bonding part so that the tip part is located at the opening cut line and penetrates the laminate. Then, it reaches the “K” -shaped cut, the opening direction is corrected, the opening is guided, and the tear can be easily opened along the opening .

Furthermore, since the surface base material layer is laminated on the surface layer of the intermediate layer on which the opening cut line is formed, there is an effect that it has strength as a packaging bag and can be prevented from being bent from the opening cut line. .

It is a top view of one embodiment concerning the packaging bag of the present invention. It is the XX line expanded sectional view in FIG. It is a principal part enlarged view concerning the packaging bag of this invention. It is the YY line expanded sectional view in FIG. It is a diagram of a "dogleg" shape cut in the shape of FIG. 3. It shows the other embodiment of the packaging bag of the present invention, is an explanatory diagram showing the shape of a "dogleg" shape cut. It shows the other embodiment of the packaging bag of the present invention, is an explanatory diagram showing the shape of a "dogleg" shape cut.

Hereinafter, an embodiment of the packaging bag of the present invention will be described with reference to the drawings. 1 is a plan view of an embodiment according to the packaging bag of the present invention, FIG. 2 is an enlarged cross-sectional view taken along line XX in FIG. 1, and FIG. 3 is an enlarged view of a main part according to the packaging bag of the present invention. represents the first circle, FIG. 4 is a line Y-Y enlarged sectional view in FIG. 3, FIG. 5 shows a schematic diagram of a "dogleg" shape cut in the shape of FIG. 3. 6 and 7 show other embodiments of the packaging bag of the present invention, shows a schematic diagram of a "dogleg" shape cut shape.

As shown in FIG. 1 and FIG. 2, a packaging bag 1 according to an embodiment of the present invention includes a laminated body in which a surface base material layer 2, an intermediate layer 3, and a heat-adhesive resin layer 4 are laminated. Two sheets of the laminated body are overlapped with the surface of the heat-adhesive resin layer 4, and a bottom sheet made of the laminated body is folded inside and inserted into the lower end, and the bottom edge is thermally bonded to form the bottom thermal bonding portion 10. It is a self-supporting bag produced by forming the side edge thermal bonding parts 11a and 11b facing both sides. On the top of the packaging bag 1, a straight opening cut 5 is formed in the intermediate layer 3 so as to be parallel to the upper edge of the packaging bag 1 and perpendicular to the side edge thermal bonding portions 11 a and 11 b along the planned opening line. , the side edge heat seal portion 11a at both ends of the opening for the cut 5, "dogleg" shaped cuts 12a to 11b, 12b is the tip portion x is formed located in the opening for the cut 5. Further, notches 13a and 13b are provided in the side edge thermal bonding portions 11a and 11b at positions away from the opening cut line 5. Further, "dogleg" shaped cuts 12a, 12b are formed side edge heat seal portion 11a, the upper portion of 11b, bulging bonding portion 14a that bulges inwardly of the packaging bag 1 facing each other , 14b.

Next, the main part of the packaging bag according to the present invention will be described in detail with reference to FIGS. FIG. 3 is an enlarged view of the main part of the present invention, and an opening cut 5 is formed in the intermediate layer 3 in parallel with the upper end edge of the packaging bag 1 along a planned opening line. Furthermore, "dogleg" shaped cuts 12a against the outer side edges heat-bonding portion 11a, so that the tip portion x is positioned on the opening for cut 5, formed on the side edge heat seal portion 11a Has been. As shown in FIG. 4, the "dogleg" shape cuts 12a are two laminate are thermally bonded, it is formed the formed side edge heat seal portion 11a therethrough. Cross the edge notches 13a the tip of the "dogleg" is parallel extension to opening for cut 5 shaped cut 12a of the notch 13a at a position remote from the opening for cut 5 in the side edge heat seal portion 11a It is provided in the range. As the shape of the notch 13a, in addition to the V notch shown in the embodiment, an I notch, a turtle shell notch, a U notch or the like can be used. The packaging bag 1 starts a tear from the notch 13a by adopting such a configuration, reaches the "dogleg" shape cuts 12a, opened easily by being guided by the opening for cut 5 is tearing direction fixes It can be done. In addition, the notch 13a and the opening cut 5 are provided at a distance from each other, so that even if an external force is applied to the upper portion of the packaging bag 1, it is prevented from being bent from the opening cut 5 and the occurrence of pinholes in the packaging bag is prevented. And the effect that barrier property does not fall is acquired. Furthermore, "dogleg" shaped cuts 12a are formed side edge heat seal portion 11a, the upper portion of 11b, bulging bonding portion 14a that bulges inward, and 14b are provided, the side it is possible to widen the width of the heat-bonded portion between the tip portion x of the inner side edge of the edge heat seal portion 11a and the "dogleg" shape cut 12a, the packaging bag 1 side end edge heat The strength of the bonding part 11a can be stabilized. Moreover, the width dimension of the side edge thermal bonding part 11b direction which the side edge thermal bonding part 11a opposes can also be enlarged without providing the bulging adhesion part 14a. In one embodiment of the present invention, the side edge heat seal portion 11a, the notches 13a in both 11b, 13b and "dogleg" shaped cuts 12a, there is shown an example of forming a 12b, formed to either May be. Moreover, although the self-supporting bag was shown as one Embodiment of this invention, it is not limited to this form, It can be used for a 3-way seal bag, a 4-way seal bag, etc.

Further, "dogleg" shaped cuts 12a, but are not limited to particular 12b is the shape of, as shown in FIG. 5, the angle α formed in the dogleg is preferably 30 ° ~150 °. More preferably, it is 90 ° to 120 °. Shortest length a from the upper end y to opening for breaks "dogleg" shaped cut 12a of the upper end edge of the packaging bag 1 with respect to the opening for cut 5 is preferably at least 0.5 mm. If it is less than 0.5mm direction tear when misaligned at the time of forming the "dogleg" shape cut it may not be guided by the opening for the cut 5. Shortest length b from the lower end z to opening for breaks "dogleg" shaped cut 12a of the bottom heat-bonding portion 10 of the packaging bag 1 with respect to the opening for cut 5 is preferably 0.5mm~5.0mm . More preferably, it is 1.0 mm to 3.5 mm. If it is misaligned when the notch 13a is provided to be less than 0.5 mm, it may not be possible to prevent the opening break 5 from being bent even if it is close to the opening break 5 and an external force is applied to the top of the packaging bag 1. . If it exceeds 5.0 mm, the tearing direction may not be guided to the opening cut 5. The length c of the bonding portion to the edge of the inner side of the "dogleg" shape cut 12a of the distal end portion x and the side edge heat seal portion 11a is preferably not less than 2 mm. If less than 2.0 mm, there is the seal strength of the side edge heat seal portion 11a of the packaging bag 1 when misaligned at the time of forming the "dogleg" shape cut can not be ensured. Also, the notch 13a is the shortest length d from the tip of the notch 13a to the opening for cut 5, the relationship between the shortest length b from the lower end z of "dogleg" shaped cuts 12a until opening for cuts d Is smaller than b (d <b).

Next, the laminated body used for this invention is demonstrated. 2 is a cross-sectional view taken along line XX of FIG. As shown in FIG. 2, the surface base material layer 2, the intermediate layer 3, and the heat-adhesive resin layer 4 are sequentially laminated, and the opening cut 5 is formed in the intermediate layer 3. The surface base material layer 2 is made of a plastic film such as polypropylene, polyethylene terephthalate, nylon or the like, or a plastic film obtained by vapor-depositing a metal oxide such as aluminum oxide or an inorganic substance such as silicon oxide, vinylidene chloride resin, polyvinyl alcohol or the like. A film obtained by coating or coextruding a gas barrier resin can be used. When these films are biaxially stretched plastic films, tearing and unsealing properties can be improved, which is more preferable. For the intermediate layer 3, films such as biaxially stretched nylon, biaxially stretched polyester, biaxially stretched polypropylene, and ethylene vinyl alcohol copolymer can be used. As the intermediate layer 3, the above film may be used as one layer, or two or more layers may be laminated. Moreover, you may use as a laminated body of the said film and aluminum foil. When two or more films are laminated and used as the intermediate layer 3, the opening cut 5 is formed in any of the layers to be laminated, or the opening cut 5 is formed in both layers. You may do it. The thermal adhesive resin layer 4 includes a thermal adhesive resin such as polypropylene, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, etc. Can be used. As a method of laminating the surface base material layer 2, the intermediate layer 3, and the heat-adhesive resin layer 4, for example, a dry lamination method using a urethane-based adhesive or a melt extrusion lamination method such as a polyethylene resin can be used. Specific configuration examples of the laminate include the following configurations.
(Configuration example)
1. VMPET / printing / DL / ON / DL / CPP
2. PET / Printing / DL / ON / DL / CPP
3. PET / Printing / DL / ON / DL / LLDPE
4). PET / DL / ALM / DL / ON / DL / CPP
5. PET / DL / ALM / DL / ON / DL / LLDPE
6). OPP / printing / DL / PET / AC / PE / LDPE
7). Barrier ON / Printing / DL / PET / AC / PE / LDPE
8). PET / Printing / DL / ON / DL / ALM / DL / CPP
Etc. The abbreviations used in the description of the configuration examples are as follows. Further, the opening cut 5 is formed in the underlined film. VMPET: polyester film on which a metal oxide such as aluminum oxide or an inorganic material such as silicon oxide is deposited, DL: dry laminate adhesive, ON: biaxially stretched nylon film, CPP: unstretched polypropylene, PET: biaxially stretched polyester film, LLDPE: linear low density polyethylene, ALM: aluminum foil, OPP: biaxially oriented polypropylene film, AC: anchor coat, PE: polyethylene, LDPE: low density polyethylene, barrier ON: ethylene vinyl alcohol copolymer film, etc. 1 shows a coextruded stretched film of a resin having a property and a nylon resin.

The opening cut 5 formed in the packaging bag 1 of the present invention is formed in the intermediate layer 3 when the laminate is manufactured. For example, when laminating by the dry lamination method, after supplying the surface base material layer 2 from the first paper feeding unit , applying an adhesive on one surface of the surface base material layer 2, and drying and removing the solvent with a dryer, Immediately before the intermediate layer 3 is supplied from the second paper feeding unit and bonded to the adhesive-coated surface of the surface base material layer 2 at the bonding portion composed of a heating roll and a pressure roll, a predetermined position of the intermediate layer 3 is obtained. A straight cutting opening 5 is formed by applying a cutting blade made of a carbide blade having a thickness of 0.2 to 0.3 mm. By comprising in this way, the opening cut 5 is covered with the surface base material layer 2, and can give the tearability of a packaging bag, without reducing the barrier property as a laminated body. "Dogleg" shaped cuts 12a, 12b and notches 13a, 13b are provided in a known manner after the step or bag manufacturing process to bag-making to produce the packaging bag from the stack.

Figure 6 shows the other embodiment of the packaging bag of the present invention, which represents a "dogleg" shape cut shape, which corresponds to FIG. 5 of an embodiment of the present invention. "Dogleg" shaped cuts 22a against the outer side edges heat-bonding portion 11a reaches the lower end z via the tip x from the top y, is formed into a substantially U-shaped, the tip x It is formed in the side edge thermal bonding part 11a so that it may be located on the opening 5 for opening. The "dogleg" shaped cuts 22a is a laminate of two sheets are thermally bonded, it is formed the formed side edge heat seal portion 11a therethrough. Parallel extension to opening for cut 5 of the tip of the notch 13a at a position where the notch 13a is separated from the opening for cut 5 in the outer side edges heat-bonding portion 11a intersects the "dogleg" shape cut 22a It is provided in the range. Others are the same as those of the embodiment of the present invention, and the description is omitted.

Figure 7 shows the other embodiment of the packaging bag of the present invention, which represents a "dogleg" shape cut shape, which corresponds to FIG. 5 of an embodiment of the present invention. "Dogleg" shaped cuts 32a against the outer side edges heat-bonding portion 11a, through the distal portion x from the top y, with respect to the opening for cut 5 from the tip x between the lower end z An inflection portion 15 having a convex shape is provided and formed on the side edge thermal bonding portion 11 a so that the tip end portion x is positioned on the opening cut 5. The "dogleg" shaped cuts 32a is a laminate of two sheets are thermally bonded, it is formed the formed side edge heat seal portion 11a therethrough. Parallel extension to opening for cut 5 of the tip of the notch 13a at a position where the notch 13a is separated from the opening for cut 5 in the outer side edges heat-bonding portion 11a intersects the "dogleg" shape cuts 32a It is provided in the range. Incidentally, it is sufficient to provide a curved portion 15 between the upper end y and the distal end portion x of the "dogleg" shape cut 32a in the case of providing above the opening for cut 5 the notch 13a. The tip portion x and the inflection portion 15 may be rounded or rounded. The angle β formed by the inflection part 15 (the angle formed by the extension line connecting the lower end z and the inflection part 15 and the opening cut 5) is preferably greater than 15 ° and 90 ° or less. If it exceeds 90 °, the tearing direction may not be guided to the opening cut line 5, and if it is 15 ° or less, formation of the inflection portion 15 becomes difficult. By providing the curved portion 15, it becomes possible to increase the length of the outer edge of the "dogleg" shape bottom z and side edge heat seal portion 11a of the slit 32a, the side edges heat or bent adhesion portion 11a, or even when the area of the "dogleg" shape cut 32a at or during transportation handling of the packaging bag the load is applied, and torn the side edge heat seal portion 11a "V It communicates with the "32" -shaped cut 32a to prevent the packaging bag from being damaged. Others are the same as those of the embodiment of the present invention, and a description thereof will be omitted.

  Next, the present invention will be described in more detail with reference to examples.

[Example 1]
A surface of the surface base material layer 2 is coated with 12 μm thick VMPET on which aluminum oxide is vapor-deposited, and a surface on which aluminum oxide is vapor-deposited is subjected to gravure printing using urethane-based ink to provide a printed pattern layer. In the process of laminating the intermediate layer 3 on the adhesive application surface using a dry lamination method using a 15 μm thick ON on the intermediate layer 3 immediately before heating and pressurizing at the bonding part Then, a cutting edge made of a cemented carbide blade having a thickness of 0.2 mm was applied to a predetermined ON position, and the opening cut line 5 continuous in the web flow direction was provided and laminated. Furthermore, a urethane adhesive was applied to the ON surface, and CPP having a thickness of 60 μm was laminated by dry lamination to produce a laminate of VMPET 12 μm / printing / DL / ON 15 μm / DL / CPP 60 μm. Using the above laminate, the opening cut 5 formed in the laminate on both the front and back sides of the bag with the bag making machine is heat-bonded so that it overlaps, and the tip portion x becomes the opening cut 5 at the side edge thermal bonding portion. position to the side edge heat seal portion 11a, 11b "dogleg" to the outer edge of the shaped cuts 12a, 12b is formed so as to penetrate through the laminate, the side edge heat seal portion 11a, 11b end of As shown in FIG. 3, the edge of the side edge thermal bonding portion 11a is extended in parallel with the opening cut 5 at the tip of the notch 13a at a position away from the opening cut 5 at a position away from the opening cut 5 at the edge. to produce a self-supporting bag by providing a V-notch in a range line intersecting the "dogleg" shape cut 12a.

The above-mentioned bag was automatically filled with boiled beans in an automatic filling and packaging line by a vacuum packaging method (a packaging machine manufactured by Toyo Automatic Machine). Thereafter, the appearance inspection of the packaging bag, the pinhole inspection, and the unsealing property of the packaging bag were evaluated, but there was no crack in the laminate at the opening cut portion, and no pinhole was generated. As for the opening property, starts opening from the V-notch, the tearing direction reaches "dogleg" shape cut along the opening scheduled line while being guided by the slit for opening could be easily opened.

[Example 2]
To produce a self-supporting bag by changing only breaks "dogleg" shape in Example 1 in the "dogleg" shape cut 22a shown in FIG. Thereafter, boiled beans were automatically filled in a vacuum packaging system in the automatic filling and packaging line in the same manner as in Example 1, and the packaging bag appearance inspection, pinhole inspection, and packaging bag openability were evaluated in the same manner as in Example 1. Both were good.

Example 3
To produce a self-supporting bag by changing only to "dogleg" shaped cuts 32a shown in FIG. 7 "dogleg" shaped cut in the first embodiment. Thereafter, boiled beans were automatically filled in a vacuum packaging system in the automatic filling and packaging line in the same manner as in Example 1, and the packaging bag appearance inspection, pinhole inspection, and packaging bag openability were evaluated in the same manner as in Example 1. Both were good.

Example 4
After gravure printing is performed on PET with a thickness of 12 μm using urethane-based ink to provide a printed pattern layer, and 9 μm thick ALM is laminated on the surface of the printed pattern layer by a dry lamination method using a urethane-based adhesive When a 15 μm thick ON is laminated on the ALM surface by a dry lamination method using a urethane adhesive, a carbide blade having a thickness of 0.2 mm is applied to a predetermined ON position in the same manner as in Example 1. A cutting edge 5 was applied to form a continuous opening cut 5 in the flow direction of the web and laminated. Further, a urethane adhesive was applied to the ON surface, and CPP having a thickness of 60 μm was laminated by a dry lamination method to produce a laminate of PET 12 μm / printing / DL / ALM 9 μm / DL / ON 15 μm / DL / CPP 60 μm. Using the above laminate, the opening cut 5 formed in the laminate on both the front and back sides of the bag with the bag making machine is heat-bonded so that it overlaps, and the tip portion x becomes the opening cut 5 at the side edge thermal bonding portion. position is "dogleg" shaped cuts 12a, 12b are formed so as to penetrate through the laminate against the outer side edges heat-bonding section, cut for opening the edge of the side edge heat seal portion 5 position away from was prepared by providing a V-notch 4-side sealed bag in the range of parallel extension to opening for cut 5 of the tip of the notch 13a is cross the "dogleg" shape cut 12a at.

  About the above four-sided sealing bag, the boiled beans are automatically filled by the vacuum packing method in the automatic filling and packaging line in the same manner as in the first embodiment. As a result of evaluating the properties, all were good.

1 Packaging bag 2 facestock layer 3 intermediate layer 4 heat-adhesive resin layer 5 opening for cut 10 bottom heat seal portion 11a, 11b side edge heat seal portion 12a, 12b, 22a, 32a "dogleg" shaped cuts 13a, 13b notch 14a, the upper end y of 14b bulging "dogleg" of the adhesive portion 15 curved portion a top end edge shaped cuts 12a
Under "dogleg" shaped cut 12a of the shortest length b bottom heat seal portion 10 side to the opening for break
Tip x and side edge heat contact of the shortest length c "dogleg" shaped cut 12a from the end z to open for break
Inward of the shortest length x "dogleg" from the tip of the length d notch 13a of the adhesive portion to the end edge to the opening for cut 5 shaped cut of the tip y "V-shaped" in the application section 11a the angle formed at the lower α angle β inflection portion formed of "dogleg" shaped for the upper end z "dogleg" cuts shaped cut

Claims (6)

A packaging bag comprising a laminate in which a surface base material layer, an intermediate layer, and a thermal adhesive resin layer are sequentially laminated,
A linear opening continuous to the intermediate layer of the packaging bag in the left-right direction parallel to the upper edge of the packaging bag at a position extending from the outer edge of the thermal bonding portion on the left edge of the packaging bag to the outer edge of the thermal bonding portion on the right edge Cuts are formed,
A left I notch is formed through the left edge thermal bonding portion at a position that does not reach the inner edge of the left edge thermal bonding portion from the outer edge of the left edge thermal bonding portion;
Between the outer edge and the inner edge of the left edge thermal bonding portion, on the right side of the left I notch and at a position not overlapping the left I notch, the left side is directed toward the outer edge of the left edge thermal bonding portion. A left-sided “cross-shaped” cut is formed through the left-side edge thermal bonding portion, with the closed side facing the inner edge of the edge thermal bonding portion,
The relative positional relationship of the opening cut in the vertical direction perpendicular to the upper edge of the packaging bag, the left I-notch, and the left-side "K" shaped cut,
The left side “cross-sectional shape” of the closed end of the closed side overlaps the opening cut,
The left I notch is in a positional relationship away from the opening cut,
An extension line parallel to the opening cut at the tip on the inner edge side of the left edge thermal bonding portion of the left I-notch is formed on a portion other than the tip on the closed side of the left “cross-shaped” cut. An easy-to-open packaging bag, characterized in that it is provided in a crossing range. A packaging bag comprising a laminate in which a surface base material layer, an intermediate layer, and a thermal adhesive resin layer are sequentially laminated,
A linear opening continuous to the intermediate layer of the packaging bag in the left-right direction parallel to the upper edge of the packaging bag at a position extending from the outer edge of the thermal bonding portion on the left edge of the packaging bag to the outer edge of the thermal bonding portion on the right edge Cuts are formed,
A right I notch is formed through the right edge thermal bonding portion at a position not reaching the inner edge of the right edge thermal bonding portion from the outer edge of the right edge thermal bonding portion;
Between the outer edge and the inner edge of the right edge thermal bonding portion, on the left side of the right I notch, the side that is open with respect to the outer edge of the right edge thermal bonding portion is positioned so as not to overlap the right I notch. A right-sided “bow” -shaped cut is formed through the right-side edge thermal bonding portion, with the closed side facing the inner edge of the edge thermal bonding portion,
The relative positional relationship of the opening cut in the vertical direction perpendicular to the upper edge of the packaging bag, the right I-notch, and the right-side "K" shaped cut,
The tip of the closed side of the right-handed “Ku” -shaped cut is in a positional relationship with the opening cut,
The right I notch is in a positional relationship away from the opening cut,
An extension line parallel to the opening cut at the tip on the inner edge side of the right edge thermal adhesive portion of the right I notch is formed on a portion other than the tip on the closed side of the right “shaped” cut. An easy-to-open packaging bag characterized by being provided at a crossing position. A packaging bag comprising a laminate in which a surface base material layer, an intermediate layer, and a thermal adhesive resin layer are sequentially laminated,
A linear opening continuous to the intermediate layer of the packaging bag in the left-right direction parallel to the upper edge of the packaging bag at a position extending from the outer edge of the thermal bonding portion on the left edge of the packaging bag to the outer edge of the thermal bonding portion on the right edge Cuts are formed,
A left I notch is formed through the left edge thermal bonding portion at a position that does not reach the inner edge of the left edge thermal bonding portion from the outer edge of the left edge thermal bonding portion;
A right I notch is formed through the right edge thermal bonding portion at a position not reaching the inner edge of the right edge thermal bonding portion from the outer edge of the right edge thermal bonding portion;
Between the outer edge and the inner edge of the left edge thermal bonding portion, on the right side of the left I notch and at a position not overlapping the left I notch, the left side is directed toward the outer edge of the left edge thermal bonding portion. A left-sided “cross-shaped” cut is formed through the left-side edge thermal bonding portion, with the closed side facing the inner edge of the edge thermal bonding portion,
Between the outer edge and the inner edge of the right edge thermal bonding portion, on the left side of the right I notch, the side that is open with respect to the outer edge of the right edge thermal bonding portion is positioned so as not to overlap the right I notch. A right-sided “bow” -shaped cut is formed through the right-side edge thermal bonding portion, with the closed side facing the inner edge of the edge thermal bonding portion,
Relative to the opening cut, the left I-notch, the right I-notch, the left-side “K” -like cut and the right-side “K-”-like cut in the vertical direction perpendicular to the upper edge of the packaging bag The positional relationship is
The left side `` Large '' shaped cut-off end of the closed side and the right side `` Large '' shaped cut end of the closed side overlap with the opening cut,
The left I notch and the right I notch are in a positional relationship apart from the opening cut,
An extension line parallel to the opening cut at the tip on the inner edge side of the left edge thermal bonding portion of the left I-notch is formed on a portion other than the tip on the closed side of the left “cross-shaped” cut. An extension line parallel to the opening cut at the inner edge side of the right edge thermal bonding portion of the right edge I notch is provided at the crossing position, and the closing of the right "B" -shaped break . An easy-to-open packaging bag, wherein the packaging bag is provided at a position where it crosses a portion other than the tip portion on the other side . A packaging bag comprising a laminate in which a surface base material layer, an intermediate layer, and a thermal adhesive resin layer are sequentially laminated,
A linear opening continuous to the intermediate layer of the packaging bag in the left-right direction parallel to the upper edge of the packaging bag at a position extending from the outer edge of the thermal bonding portion on the left edge of the packaging bag to the outer edge of the thermal bonding portion on the right edge Cuts are formed,
The left-side tear initiation region having one end having a wide width at the outer edge position of the left-side edge thermal bonding portion and the other end whose width is concentrated at a position not reaching the inner edge of the left-side edge thermal bonding portion It is formed through the left edge thermal bonding part,
The side that is open with respect to the outer edge of the left edge thermal bonding portion at a position that does not overlap the left tear initiation region on the right side of the left tear initiation region between the outer edge and the inner edge of the left edge thermal bonding portion A left-sided “cross-shaped” cut is formed through the left-side edge thermal bonding portion, facing the closed side with respect to the inner edge of the left-side edge thermal bonding portion,
Relative positional relationship of the opening cut in the vertical direction perpendicular to the upper edge of the packaging bag, the left-side tear initiation region and the left-side `` shape ''-like cut,
The left side “cross-sectional shape” of the closed end of the closed side overlaps the opening cut,
The left side tear start region is in a positional relationship away from the opening cut,
An extension line parallel to the opening cut at the other end aggregated on the inner edge side of the left side edge thermal bonding portion of the left side tear start region is on the closed side of the left-sided “cross-shaped” cut . An easy-to-open packaging bag, characterized in that it is provided at a position that intersects with a portion other than the tip portion . A packaging bag comprising a laminate in which a surface base material layer, an intermediate layer, and a thermal adhesive resin layer are sequentially laminated,
A linear opening continuous to the intermediate layer of the packaging bag in the left-right direction parallel to the upper edge of the packaging bag at a position extending from the outer edge of the thermal bonding portion on the left edge of the packaging bag to the outer edge of the thermal bonding portion on the right edge Cuts are formed,
The right-side tear initiation region having one end having a wide width at the outer edge position of the right edge thermal bonding portion and the other end having the width concentrated at a position not reaching the inner edge of the right edge thermal bonding portion Formed through the right edge thermal bond,
The side that is open with respect to the outer edge of the right edge thermal bonding portion at a position that does not overlap the right tear initiation region on the left side of the right tear initiation region between the outer edge and the inner edge of the right edge thermal bonding portion A right "edge" -shaped cut is formed through the right edge thermal bond, facing the closed side with respect to the inner edge of the right edge thermal bond,
The relative positional relationship between the opening cut in the vertical direction perpendicular to the upper edge of the packaging bag, the right-side tear start region, and the right-side “cross-shaped” cut,
The tip of the closed side of the right-handed “Ku” -shaped cut is in a positional relationship with the opening cut,
The right side tear initiation region is in a positional relationship away from the opening cut line,
An extension line parallel to the opening cut at the other end aggregated on the inner edge side of the right edge thermal bonding portion of the right side tear start region is on the closed side of the right “cross-shaped” cut . An easy-to-open packaging bag, characterized in that it is provided at a position that intersects with a portion other than the tip portion . A packaging bag comprising a laminate in which a surface base material layer, an intermediate layer, and a thermal adhesive resin layer are sequentially laminated,
A linear opening continuous to the intermediate layer of the packaging bag in the left-right direction parallel to the upper edge of the packaging bag at a position extending from the outer edge of the thermal bonding portion on the left edge of the packaging bag to the outer edge of the thermal bonding portion on the right edge Cuts are formed,
The left-side tear initiation region having one end having a wide width at the outer edge position of the left-side edge thermal bonding portion and the other end whose width is concentrated at a position not reaching the inner edge of the left-side edge thermal bonding portion It is formed through the left edge thermal bonding part,
The right-side tear initiation region having one end having a wide width at the outer edge position of the right edge thermal bonding portion and the other end having the width concentrated at a position not reaching the inner edge of the right edge thermal bonding portion Formed through the right edge thermal bond,
The side that is open with respect to the outer edge of the left edge thermal bonding portion at a position that does not overlap the left tear initiation region on the right side of the left tear initiation region between the outer edge and the inner edge of the left edge thermal bonding portion A left-sided “cross-shaped” cut is formed through the left-side edge thermal bonding portion, facing the closed side with respect to the inner edge of the left-side edge thermal bonding portion,
The side that is open with respect to the outer edge of the right edge thermal bonding portion at a position that does not overlap the right tear initiation region on the left side of the right tear initiation region between the outer edge and the inner edge of the right edge thermal bonding portion A right "edge" -shaped cut is formed through the right edge thermal bond, facing the closed side with respect to the inner edge of the right edge thermal bond,
The opening cut in the vertical direction perpendicular to the upper edge of the packaging bag, the left-side tear start region, the right-side tear start region, the left-side “C” -like cut, and the right-side “V” -like shape The relative positional relationship of
The left side `` Large '' shaped cut-off end of the closed side and the right side `` Large '' shaped cut end of the closed side overlap with the opening cut,
The left-side tear initiation region and the right-side tear initiation region are in a positional relationship away from the opening cut;
An extension line parallel to the opening cut at the other end aggregated on the inner edge side of the left side edge thermal bonding portion of the left side tear start region is on the closed side of the left-sided “cross-shaped” cut . An extension line that is provided at a position that intersects with a portion other than the tip and that is parallel to the opening cut at the other end aggregated on the inner edge side of the right edge thermal bonding portion of the right tear initiation region An easy-to-open packaging bag, characterized in that it is provided at a position where it intersects with a portion other than the closed end portion on the right side of the "U" shape.

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