JP2007276823A - Packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging bag capable of positively terminating propagation of a tear when a packaging bag is torn out to open its seal part, positively leaving a torn-out piece at the bag surface, also capable of cutting apart the torn-out piece as desired from the bag surface, restricting a reduction in strength at an adhering part and preventing a breakage of the bag surface. <P>SOLUTION: Sheet members 10, 12 having a base layer and a sealant layer are overlapped to each other while the sealant layer is set inside. Edges of these sheet members are adhered to each other to form a sealingly closed bag. A part near one side of the seal opening part is torn out with an adhering part 14b of one side being applied as a starting point to cause the sealed part to be opened. One of the base layers of sheet members to be adhered to each other at the front side adhering part 26 in its tearing-out direction is formed with a tearing-out stopper line 30 so as to be crossed with the tearing-out direction as seen in its top plan view. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, a sheet material obtained by laminating a base material layer and a sealant layer (adhesive layer or adhesive layer) is overlapped, and the edges of the sheet material are bonded to each other to form a sealed bag. The present invention relates to a packaging bag in which a spout is formed by tearing by hand.

  A packaging bag that seals beverages, liquid foods, liquid detergents for refills, shampoos, powdered coffee, salt, etc., for example, two sheets of a base material layer and a sealant layer are laminated, with each sealant layer on the inside The sheet material is overlapped with each other, or one sheet material is folded with the sealant layer on the inner surface side, and the edges of the sheet material are bonded to each other, leaving one side, and formed into a bag shape. After the contents are filled through the openings, the edges on one side are bonded to each other. In this packaging bag, a spout is formed by tearing the bag surface along one side on the opening side from the opening notch portion formed in the adhesive portion on one side, and from the spout The contents are poured out. Due to such an opening method, the bag surface may be torn more than necessary when the packaging bag is opened, and the contents may be spilled, or the tear may not be sufficient and the spout may not be formed normally. In addition, since the excision piece that has been torn off and separated becomes garbage, there are problems such as being troubled with the treatment outdoors, or having the infant accidentally ingest the excision piece.

In order to eliminate the above-mentioned problems, a cut-off slit in the direction intersecting the tear line is provided in the adhesive part of the packaging bag, and the tear-off of the bag surface is reliably stopped by the cut-off slit, and the tear piece from the bag surface when opened There has been proposed a packaging bag in which a portion is not separated (see, for example, Patent Document 1). Further, in the vicinity of the corner where the spout is formed, an adhesive portion extending along the edge of one side from the upper edge and spaced from the edge is formed extending in a direction intersecting the tearing direction. There has been proposed a packaging bag in which an L-shaped spout forming cut portion is formed in an adhesive portion and a cutting cut is formed along the longitudinal direction of the adhesive portion (for example, see Patent Document 2).
JP 7-69370 A (page 2-3, FIGS. 1 to 8) JP 2000-6992 A (page 3-4, FIGS. 1 and 2)

  In the packaging bags described in Patent Documents 1 and 2 above, when the bag surface is torn and opened, the cut-off slits and cuts provided in the adhesive portion so that the front end of the tearing portion intersects the tearing direction When reaching the formation position of the part, tear propagation is stopped. As described above, the tear stop position is defined by the cut-off slit or the cut portion provided in the adhesive portion of the packaging bag, and the tear piece portion can be left on the bag surface. However, if slits (linear through-holes) or cuts are formed in the adhesive part of the packaging bag, the strength of the part will be reduced, so when filling the contents, and then packing and transporting the package If a force is applied to the slit or notch forming part, the bag surface may tear from the slit or notch forming part and break the bag. Further, in the packaging bags described in Patent Documents 1 and 2 above, it is possible to leave the tear piece part on the bag surface when opened, but tear it in the direction along the slit or cutting cut that intersects the tearing direction. When the one part is pulled, there is a problem that the tearing piece part is separated from the bag surface relatively easily.

  The present invention has been made in view of the circumstances as described above. When the bag surface is torn and opened, tear propagation can be reliably stopped and the tear piece portion is reliably left on the bag surface. An object of the present invention is to provide a packaging bag that can be torn and, if necessary, the tear piece portion can be separated from the bag surface, and can prevent the bag surface from tearing by suppressing a decrease in strength at the adhesive portion. And

  In the invention according to claim 1, the sheet material obtained by laminating the base material layer and the sealant layer is overlapped with the sealant layer as the inner surface side, and the edges of the sheet material are bonded to each other to form a sealed bag, which is opened. In a packaging bag that is opened by tearing the vicinity of one side as a starting point from the adhesive part on one side, at least the base material of the sheet material adhered to each other at the front adhesive part in the tearing direction A tear stop line is formed in the layer so as to intersect the tear direction in a plan view.

  In the invention according to claim 2, the sheet material obtained by laminating the base material layer and the sealant layer is overlapped with the sealant layer as the inner surface side, and the edges of the sheet material are bonded to each other to form a sealed bag, which is opened. In a packaging bag that is opened by tearing the vicinity of one side as a starting point from the adhesive part on one side, at least each base material of both sheet materials adhered to each other at the front adhesive part in the tearing direction A tear stop line is formed in each layer so as to intersect the tear direction in a plan view and to be shifted in the tear direction.

  The invention according to claim 3 is the packaging bag according to claim 1 or claim 2, wherein the sheet material is partially adhered so as to enter the inside from one side which becomes the opening side, thereby forming a convex adhesive portion, A spout is formed by forming a tear stop line in the convex adhesive part and tearing the vicinity of one side on the opening side from the adhesive part on one side to the convex adhesive part via the non-adhesive part. It is characterized by doing so.

  The invention according to claim 4 is characterized in that, in the packaging bag according to any one of claims 1 to 3, an opening notch is formed at a tear start position of the adhesive portion on one side.

  The invention according to claim 5 is the packaging bag according to any one of claims 1 to 4, wherein the tear stop line has an obtuse angle between the direction from one end near one side to the other side on the opening side and the tear direction. It is characterized in that it is shaped to form

  The invention according to claim 6 is characterized in that, in the packaging bag according to any one of claims 1 to 5, the end of the tear stop line on the side away from one side which is the opening side is curved. To do.

  The invention according to claim 7 is characterized in that, in the packaging bag according to any one of claims 1 to 6, an end of the tear stop line that is closer to one side on the opening side is curved.

In the packaging bag of the invention according to claim 1, formation of a tear stop line provided at the adhesive portion so that the front end of the tearing portion intersects the tearing direction when the vicinity of one side on the opening side is torn and opened When reaching the position, the tear propagation is stopped and the tear piece is left on the bag surface. And since the tear stop line is formed on only one of the sheet materials adhered to each other, the tear piece portion is formed in the direction along the slit or cutting cut intersecting with the tear direction as in the conventional packaging bag. The tear piece is not easily separated from the bag surface when it is pulled, and if the tear piece is slightly pulled in the direction along the tear stop line that intersects the tear direction, the tear piece Is not cut off from the bag surface. On the other hand, the tear piece portion is separated from the bag surface by pulling the tear piece portion along the tear stop line in one side direction which is the opening side. Further, since the tear stop line is formed only on one side of the sheet material, there is little decrease in strength at the site where the tear stop line is formed. For this reason, even if force is applied to the formation site of the tear stop line at the time of filling the contents or packing / transporting the package, the bag surface is torn from the formation site of the tear stop line to break the bag. There is no worry.
Accordingly, the invention according to claim 1 can reliably stop tear propagation at the time of opening, can reliably leave the tear piece portion on the bag surface, and can separate the tear piece portion from the bag surface as necessary. It is also possible to provide a packaging bag capable of preventing the bag surface from tearing by suppressing a decrease in strength at the bonded portion.

In the packaging bag of the invention according to claim 2, formation of a tear stop line provided at the adhesive portion so that the front end of the tearing portion intersects the tearing direction when the vicinity of one side on the opening side is torn and opened When reaching the position, the tear propagation is stopped and the tear piece is left on the bag surface. And since the tear stop line is formed by shifting the position in the tearing direction on both of the sheet materials adhered to each other, like the conventional packaging bag, along the slit or cutting cut that intersects the tearing direction The tear piece is not easily separated from the bag surface when the tear piece is pulled in the opposite direction, and the tear piece is slightly pulled in the direction along the tear stop line that intersects the tear direction. In such a case, the tear piece is not separated from the bag surface. On the other hand, the tear piece portion is separated from the bag surface by pulling the tear piece portion along the tear stop line in one side direction which is the opening side. Further, since the tear stop line is formed by shifting the position in the tear direction on both of the sheet materials, the decrease in strength at the site where the tear stop line is formed is small. For this reason, even if force is applied to the formation site of the tear stop line at the time of filling the contents or packing / transporting the package, the bag surface is torn from the formation site of the tear stop line to break the bag. There is no worry. Furthermore, since the tear stop lines are formed by shifting the positions in the tear direction on both of the sheet materials, it is possible to more reliably stop the tear propagation.
Therefore, the invention according to claim 2 can more reliably stop tear propagation at the time of opening, can reliably leave the tear piece portion on the bag surface, and can separate the tear piece portion from the bag surface as necessary. In addition, it was possible to provide a packaging bag capable of preventing the tearing of the bag surface by suppressing the strength reduction at the bonded portion.

  In the packaging bag of the invention according to claim 3, when the front side of the tear portion reaches the formation position of the tear stop line provided in the convex adhesive portion when tearing and opening the vicinity of one side on the opening side. Since the tear propagation is stopped, a spout having a desired size can be formed between the adhesive portion on one side and the convex adhesive portion.

  In the packaging bag of the invention which concerns on Claim 4, the bag surface can be easily torn starting from the formation part of the notch for opening.

  In the packaging bag of the invention which concerns on Claim 5, after tearing a bag surface until it reaches | attains a tear stop line, a tear piece part can be separated from a bag surface comparatively easily.

  In the packaging bag of the invention according to claim 6, after the bag surface is torn until it reaches the tear stop line, it is in a direction away from one side that becomes the opening side along the tear stop line with respect to the formation site of the tear stop line. Even if force is applied, tear propagation reliably stops at the curved end of the tear stop line. For this reason, there is no fear that the bag surface is torn from the site where the tear stop line is formed and the bag is broken.

  In the packaging bag of the invention according to claim 7, after the bag surface is torn until it reaches the tear stop line, a force is applied in the direction of one side that becomes the opening side along the tear stop line with respect to the formation site of the tear stop line. Even if added, tear propagation is reliably stopped at the curved end of the tear stop line. For this reason, the tear piece can be reliably left on the bag surface.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the best embodiment of the present invention will be described with reference to the drawings.
1 and 2 show an example of an embodiment of the present invention, FIG. 1 is a plan view of a packaging bag, and FIG. 2 is a partial enlarged cross-sectional view taken along the line II-II in FIG. In addition, illustration of the content is abbreviate | omitted in the figure.

  In this packaging bag, the two sheet materials 10 and 12 are stacked by stacking the front and back two sheet materials 10 and 12 and bonding the peripheral portions of the both sheet materials 10 and 12 by a heat seal (thermal bonding) method. 12 are formed in a sealed bag shape having a housing portion surrounded by the inner surface of each of the upper and lower side adhesive portions 14b, 14c, and the lower side adhesive portion 14d. The contents, for example, beverages, liquid foods, liquid detergents for refilling, shampoo, powdered coffee, salt, and the like are filled in the housing and sealed. Each sheet material 10 and 12 is formed by laminating base material layers 16 and 20 and sealant layers (adhesive layers or adhesive layers) 18 and 22, respectively, so that the sealant layers 18 and 22 are on the inner surface side. It is superimposed. In addition, an opening notch 24 is formed at a portion of the packaging bag that is the tear start position of one side adhesive portion 14b.

  The material constituting the sheet materials 10 and 12 is not particularly limited, and may be appropriately selected according to the type and properties of the contents, the filling amount, etc. The material of the base material layers 16 and 20 is, for example, biaxial stretching A synthetic resin film such as a nylon film, a biaxially stretched polypropylene film or a biaxially stretched polyethylene terephthalate film, or a film obtained by depositing aluminum on these films, paper, cellophane, or the like is used. The base material layers 16 and 20 are formed of a single layer film or the like among these materials, or are formed by laminating a plurality of layers of the same type or different types of films. Examples of the material for the sealant layers 18 and 22 include low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene- A thermoplastic synthetic resin such as a methacrylic acid copolymer, an ethylene-methyl acrylate copolymer, an ethylene-ethyl acrylate copolymer, an ethylene-methyl methacrylate copolymer, or an ionomer is used, or a sealing agent, an adhesive, etc. A coating agent can also be used. The method for laminating the base material layers 16 and 20 and the sealant layers 18 and 22 is not particularly limited. For example, a general laminating method such as a dry laminating method or an extrusion coating method is used. Moreover, you may comprise the sheet | seat materials 10 and 12 using the co-pressing film with which the base material layers 16 and 20 and the sealant layers 18 and 22 were united, for example, a heat seal polypropylene film.

  In this packaging bag, a convex adhesive portion 26 is formed by partially thermally bonding the sheet materials 10 and 12 so as to enter the inside from the upper side adhesive portion 14a on the opening side. The convex adhesive portion 26 is provided so as to be slightly spaced from the side adhesive portion 14b provided with the opening notch 24 and to protrude toward the bottom side from the position where the opening notch 24 is provided. Yes. A tear stop line 30 is formed on the convex adhesive portion 26 so as to intersect with the tear virtual line 28 indicated by a two-dot chain line. As shown in FIG. 2, the tear line 30 is formed only on one of the sheet materials 10 that are thermally bonded to each other. This tear stop line 30 is for stopping the tear propagation when the bag surface is torn and opened. The tear stop line 30 may be formed in the base material layer 16 and the sealant layer 18 as shown in FIG. 2, or the tear stop line 32 is formed only in the base material layer 16 as shown in FIG. You may make it do. Since the base material layer 16 is formed of a material having a breaking strength greater than that of the sealant layer 18, in other words, the breaking strength of the sealant layer 18 is smaller than that of the base material layer 16, so that the tearing stops as shown in FIG. Even when the line 32 is formed only on the base material layer 16, the role of stopping the tear propagation is sufficiently fulfilled. A plurality of tearing stop lines 30 may be provided by shifting the positions in the tearing direction. The method for forming the tear stop line 30 on the sheet material 10 is not particularly limited. For example, the sheet material 10 is punched in a line or pushed out before the sheet materials 10 and 12 are thermally bonded to each other. What is necessary is just to form.

  As shown in FIG. 4, the packaging bag is opened by tearing the vicinity of the upper side on the opening side from the notch 24 for opening along the upper side. The spout 34 is formed between the side adhesive portion 14 b and the convex adhesive portion 26 by being torn from the side adhesive portion 14 b to the convex adhesive portion 26 through the non-adhesive portion. At this time, when the front end of the tear portion reaches the formation position of the tear stop line 30 provided in the convex adhesive portion 26, the tear propagation is stopped at that position, and the tear piece portion 36 remains on the bag surface. Since the tear stop line 30 is formed only on one sheet material 10, unlike the conventional packaging bag in which slits and cuts are formed so as to penetrate both sheet materials, the tear piece As long as the portion 36 is pulled lightly in the direction along the tear stop line 30, the tear piece 36 is not separated from the bag surface. If the contents in the packaging bag are poured out from the spout 34 in this state, there will be no trouble with the treatment of the tear piece 36 or the infant will accidentally swallow the tear piece 36. . On the other hand, when the tear piece 36 is slightly pulled along the tear stop line 30 in one side direction which is the opening side, the connecting portion between the tear piece 36 and the bag surface is guided by the tear stop line 30 and is torn. As shown in FIG. 5, the tear piece 36 is separated from the bag surface. The tear piece 36 separated from the bag surface may be discarded in a trash box or the like nearby.

  Moreover, since the tear stop line 30 is formed only on one sheet material 10, a decrease in strength at the site where the tear stop line 30 is formed can be suppressed. For this reason, even if force is applied to the site where the tear stop line 30 is formed, for example, when filling the contents into the packaging bag or packing / transporting the package, the bag surface is removed from the site where the tear stop line 30 is formed. There is no worry of tearing and breaking the bag.

  FIG. 6 is a plan view of a packaging bag showing another embodiment of the present invention. In this packaging bag, members and parts common to the packaging bag shown in FIG. 1 are denoted by the same reference numerals as those used in FIG.

  In the packaging bag shown in FIG. 6, the tear stop line 38 provided on the convex adhesive portion 26 is formed so as to be inclined forward in the tear direction with respect to the direction orthogonal to the tear virtual line 28. That is, the tear stop line 38 is formed so that the angle θ formed between the tear virtual line 28 and the upper side of the tear stop line 38 becomes an obtuse angle. By providing the tear stop line 38 so as to be inclined with respect to the direction orthogonal to the tear direction in this way, the tear piece portion 40 is formed after the bag surface is torn until it reaches the tear stop line 38 as shown in FIG. When pulled in an oblique direction along the tear stop line 38, the connecting portion between the tear piece 40 and the bag surface is torn, and the tear piece 40 is separated from the bag surface relatively easily.

  FIG. 8 is a plan view of a packaging bag showing still another embodiment of the present invention. In this packaging bag, members and parts common to the packaging bag shown in FIG. 1 are denoted by the same reference numerals as those used in FIG.

  In the packaging bag shown in FIG. 8, both ends of the tear stop line 42 provided on the convex adhesive portion 26 are curved. A portion where the tear stop line 42 is formed after the bag surface is torn until the tear stop line 42 reaches the tear stop line 42 because the end portion 42a on the side away from the opening side is curved. On the other hand, even if a force is applied along the tear stop line 42 in a direction away from one side on the opening side, the tear propagation is surely stopped at the end 42a of the tear stop line 42. For this reason, there is no fear that the bag surface is torn from the site where the tear stop line 42 is formed and the bag is broken. Further, since the end portion 42b near the one side on the opening side of the tearing stop line 42 is curved, after the bag surface is torn until it reaches the tearing stop line 42, the tear stop line 42 is formed at the site where the tearing stop line 42 is formed. On the other hand, even if a force is applied along the tear stop line 42 in the direction of one side on the unsealing side, the tear propagation is surely stopped at the end 42b of the tear stop line 42. For this reason, the tear piece can be reliably left on the bag surface.

  In addition, in the packaging bag shown in FIG. 8, although the both ends of the tearing stop line 42 are curved, only one of the ends may be curved. Moreover, as shown in FIG. 6, you may make it curve the both ends of the tear stop line 38 formed by inclining with respect to the direction orthogonal to a tear direction, or any one edge part.

  In each of the packaging bags described above, tear stop lines 30, 32, 38, 42 are formed only on one of the sheet materials 10 that are thermally bonded to each other. As shown in the partial enlarged cross-sectional views of the adhesive portions, the sheet materials 44 and 46 bonded to each other are shifted in the tearing direction on the front and back sides, respectively, and one or a plurality of tear stop lines 56, 58; 60, 62 may be formed. In the embodiment shown in FIG. 9, tear stop lines 56 and 58 are formed in the base material layers 48 and 52 and the sealant layers 50 and 54. In the embodiment shown in FIG. 10, the base material layers 48 and 52 are used. Only the tearing stop lines 60 and 62 are formed.

  As shown in FIGS. 9 and 10, even if tear stop lines 56, 58; 60, 62 are formed on both sheet materials 44, 46, tear stop lines 56, 60 provided on one sheet material 44, Since the tear stop lines 58 and 62 provided on the other sheet material 46 are displaced from each other in the tear direction, a decrease in strength at the formation site of the tear stop lines 56, 58; For this reason, even if a force is applied to the formation site of the tear stop lines 56, 58; 60, 62 during the filling operation of the contents into the packaging bag or the packing / transporting of the package, the tear stop lines 56, 58 ; There is no worry that the bag surface tears from the formation site of 60, 62 and breaks. Furthermore, the tear stop lines 56, 58; 60, 62 are formed by shifting the positions in the tear direction on both the sheet materials 44, 46, so that the tear propagation can be stopped more reliably. In the case where a plurality of tear stop lines are provided in close proximity to each other in the tear direction, when the flexibility of the sheet material is high, rather than forming a plurality of tear stop lines only on one sheet material 10 As shown in FIGS. 9 and 10, it is easier to manufacture the packaging bag if the tear stop lines 56, 58; 60, 62 are formed on both sheet materials 44, 46.

  In addition, the manufacturing method and form of a packaging bag are not limited to what was shown in FIG.1, FIG.6 and FIG.8. For example, as shown in a plan view in FIG. 11, one sheet material 64 formed by laminating a base material layer and a sealant layer is folded with the sealant layer as an inner surface, and the edge portions are thermally bonded. In addition, each side edge portion is thermally bonded to each other, thereby forming a bag shape having a housing portion surrounded by the inner surface of the sheet material 64, the edge edge bonding portion 66a, and both side edge bonding portions 66b and 66c. The above-described configuration can also be applied to the packaging bag. That is, in the packaging bag of the form shown in FIG. 11, the sheet material 64 is partially thermally bonded so as to enter the inside from the edge bonding portion 66a on the opening side, thereby forming the convex bonding portion 68. A tear stop line 74 is formed in the shaped adhesive portion 68 so as to intersect with a tear virtual line 72 starting from the opening notch 70 formed in one side edge adhesive portion 66b.

  Moreover, in each above-mentioned embodiment, the edge parts of the sheet | seat materials 10 and 12 or the sheet material 64 of 1 sheet folded up so that it may enter inside from the upper edge adhesion parts 14a and 66a used as the unpacking side of a packaging bag. The convex adhesive portions 26 and 68 are partially bonded by thermal bonding, and tearing stop lines 30, 38, 42, and 74 are formed in the convex adhesive portions 26 and 68. FIG. As shown in the plan view of the packaging bag (in this packaging bag, members and parts common to the packaging bag shown in FIG. 1 are given the same reference numerals as those used in FIG. 1). A tear stop line 75 is formed on the side adhesive portion 14c facing the side adhesive portion 14b provided with the opening notch 24 without intersecting the tear virtual line 28 indicated by a two-dot chain line. You may make it install. Thus, the position of the bonding portion that forms the tear stop line is not particularly limited.

  Further, in the above-described embodiment, the peripheral portions, the edge portions and the side edge portions of the sheet material are thermally bonded to form a bag shape, but the sheet is formed by using an adhesive or an adhesive. By adhering the peripheral edges, edge edges, and side edges of the material, the sheet material is formed into a bag shape to form a packaging bag, and the sheet material is partially used by using an adhesive or an adhesive. You may make it form a convex-shaped adhesion part by making it adhere | attach.

  Next, an experimental example comparing the unsealing properties of the packaging bag according to the present invention and the conventional packaging bag, and the results thereof, and the two sheets of material are superposed on each other as in the packaging bag according to the present invention. Of the bonded sheet piece, a tear stop line is formed only on one sheet material, and a slit is formed so as to penetrate both sheet materials of a similar sheet piece as in a conventional packaging bag. Experimental examples comparing results such as tearing stopping force and damage resistance, and results thereof will be described.

  As a packaging bag according to the present invention, a tear stop line 30 is formed only on one sheet material 10 as shown in FIG. 2 at the convex adhesive portion 26 of the packaging bag of the form shown in FIG. Packaging bag (I)), and as shown in FIG. 9, both sheet materials 44, 46 are shifted in position to form tear stop lines 56, 58 (packaging bag (II) according to the present invention) ). Further, as a conventional packaging bag, a slit having the same length as the tearing stop line 30 of the convex adhesive portion 26 of the packaging bag of the form shown in FIG. The thing formed in was produced. The conditions for heat-sealing the peripheral portions of both sheet materials were a sealing temperature of 130 ° C., a sealing pressure of 0.2 MPa, and a sealing time of 1 second.

  Further, as a test piece for measurement according to the present invention, a cutting blade is applied to a sheet material obtained by extrusion-coating a linear low density polyethylene (sealant layer) to a thickness of 50 μm on a biaxially stretched nylon film (base material layer) having a thickness of 15 μm. A sheet having a predetermined tear stop line and the sheet material which does not form a tear stop line are overlapped with each other, and a bonded part is formed by a heat seal method. In addition, as a test piece for measurement according to a conventional product, two sheets of the sheet material were overlapped and an adhesive portion was formed by a heat sealing method, and then a slit penetrating both sheet materials was formed by a cutting blade. The conditions for heat-sealing both sheet materials were the same as described above. The tensile strength of the base material layer (biaxially stretched nylon film having a thickness of 15 μm) constituting the sheet material is 52.8 N / 15 mm, and the tensile strength of the sealant layer (linear low density polyethylene having a thickness of 50 μm) is 8.6 N / 15 mm (Test method: Tensile strength / tensile elongation, JIS K7127 “Plastic tensile properties Part 3 Film and sheet test conditions”, JIS K7161 “Plastic tensile properties test method”; : 23 ° C., humidity 50%; Tester: AG-10kNIS MS type manufactured by Shimadzu Corporation).

[Openability test 1]
By tearing the packaging bag (I) according to the present invention and the conventional packaging bag by hand along the upper side from the notch for opening, and judging the packaging bag whose tearing has stopped at the tear stop line or slit as the acceptable product The openability was evaluated by five panelists. The results are shown in Table 1.

表１に示した結果から、この発明に係る包装袋は、引き裂き停止線が施されたことにより引き裂き停止位置を制御することが可能であることが分かる。なお、本発明に係る包装袋（II）についても、本発明に係る包装袋（Ｉ）と同じ結果が得られた。

From the results shown in Table 1, it can be seen that the packaging bag according to the present invention can control the tear stop position by providing the tear stop line. In addition, the same result as the packaging bag (I) according to the present invention was obtained for the packaging bag (II) according to the present invention.

[Openability test 2]
As a packaging bag according to another embodiment of the present invention, as shown in FIG. 6, a product in which a tearing stop line 38 is formed on the convex adhesive portion 26 so as to be inclined with respect to a direction orthogonal to the tearing direction was manufactured. . Then, after tearing the packaging bag by hand along the upper side from the opening notch until reaching the tear stop line 38, the tear piece 40 is pulled diagonally along the tear stop line 38. An evaluation of unsealing performance by five panelists was performed by determining that a product that had been torn and propagated along the tear stop line 38 without stopping at the stop line 38 was an acceptable product. The conditions for heat-sealing the peripheral portions of both sheet materials were a sealing temperature of 130 ° C., a sealing pressure of 0.2 MPa, and a sealing time of 1 second.
As a result, in all five panelists, the evaluation was [number of passed bags / total number of bags] = 10/10. In addition, in the packaging bag of the structure shown in FIG. 1, as shown by the result of the openability test 1, tearing stopped at the tear stop line.

[Tear end stop force test]
As a test piece for measurement according to the present invention, a test piece 80a (test piece (I) according to the present invention) in which one tear stop line 76a and a cutting line 78a are formed as shown in FIG. And, as shown in FIG. 13 (b), a test piece 80b (test piece (II) according to the present invention) in which two tear stop lines 76b and a cutting line 78b are formed is produced, respectively, and related to the conventional product. As a test piece for measurement, a test piece 80c in which one slit 76c and a cutting line 78c were formed as shown in FIG. The dimensions of each part are a = 50 mm, b = 150 mm, c = 75 mm, d = 25 mm, and e = 20 mm.
For each test piece, the tearing end stopping force was evaluated by using the tear propagation strength as an index (test method: JIS K7128-1 "Tear strength test method for plastic film and sheet, part 1 trouser tear method"; test environment : 23 ° C., humidity 50%; Tester: AG-10kNIS MS type manufactured by Shimadzu Corporation). The results are shown in Table 2.

表２に示した結果から、この発明に係る包装袋のように引き裂き停止線を施すことにより、引き裂き停止位置を制御することが可能であることが分かる。

From the results shown in Table 2, it can be seen that the tear stop position can be controlled by applying a tear stop line as in the packaging bag according to the present invention.

[Damage resistance test for bonded parts]
As a test piece for measurement according to the present invention, a test piece 84a (test piece (I) according to the present invention) in which one tear stop line 82a is formed as shown in FIG. As shown in FIG. 14B, test pieces 84b (test pieces (II) according to the present invention) each having two tear stop lines 82b formed as shown in FIG. A test piece 84c in which one slit 82c was formed as shown in c) was produced. The dimensions of each part are f = 15 mm, g = 150 mm, h = 10 mm, and i = 2 mm. Moreover, the same test piece in which neither a tear stop line nor a slit was formed was prepared as a blank.
For each test piece, the breakage resistance of the bonded portion was evaluated using tensile strength and tensile elongation as indicators (test method: JIS K7127 “Plastic tensile properties Part 3 Film and sheet test conditions”, JIS K7161 “Plastic Test method for tensile properties "; test environment: 23 ° C, humidity 50%; tester: AG-10kNIS MS type manufactured by Shimadzu Corporation. The results are shown in Table 3.

表３に示した結果から分かるように、この発明に係る包装袋のように引き裂き停止線を形成しただけの接着部は、従来の包装袋のようにスリットを形成した接着部と比較して、耐破損性の低下を抑えることができる。

As can be seen from the results shown in Table 3, the adhesive part that only formed the tear stop line as in the packaging bag according to the present invention is compared with the adhesive part in which the slit is formed as in the conventional packaging bag, A decrease in breakage resistance can be suppressed.

[Tear Propagation Test]
As a test piece for measurement according to the present invention, as shown in FIG. 15 (a), a test piece 90a in which a cutting line 86a and a tear stop line 88 connected to the extension line are formed as shown in FIG. A test piece in which only the cutting line 86b was formed as shown in (b) was prepared. The dimensions of each part are j = 50 mm, k = 150 mm, l = 75 mm, m = 25 mm.
For each test piece, tear propagation was evaluated using tear propagation strength as an index (test method: JIS K7122-1 “Tear strength test method for plastic film and sheet, Part 1 Trouser tear method”; test environment: 23 ° C, humidity 50%; tester: AG-10kNIS MS type manufactured by Shimadzu Corporation.

  In the test piece according to the present invention, the tear propagation strength was 0.8 N, and it was guided by the tear stop line 88 and propagated in a straight line. On the other hand, in the blank test piece in which the tear stop line was not formed, the tear propagation strength was 1.2 N, and the tear propagation direction was separated from the straight line. From this result, it is understood that the tear propagation direction can be controlled by providing a tear stop line as in the packaging bag according to the present invention.

(Tearing stop force test for curved end)
As shown in FIG. 16A, a test piece 96a having a curved end portion of a tearing stop line 94a connected to the cutting line 92a and connected to the cutting line 92b as shown in FIG. 16B. Each of the test pieces 96b that remain straight without bending the end portion of the tear stop line 94b was evaluated, and the stopping force at the tear end was evaluated using the tear propagation strength as an index (test method: JIS K7128-). 1 “Plastic film and sheet tear strength test method part 1 trouser tear method”; test environment: 23 ° C., humidity 50%; tester: AG-10kNIS MS type manufactured by Shimadzu Corporation). The dimensions of each part are n = 50 mm, o = 150 mm, p = 75 mm, q = 25 mm, and r (radius of the curved part) = 3 mm.

  In the test piece 96a in which the end portion of the tear stop line 94a is curved as shown in FIG. 16 (a), the tear propagation strength is 51.7N, and the tear stop as shown in FIG. 16 (b). The tear stopping force at the end of the tear stop line was significantly increased as compared with the test piece 96b where the end of the line 94b was not bent (tear propagation strength = 0.8 N).

It is a top view of the packaging bag which shows an example of embodiment of this invention. It is the II-II arrow partial enlarged cross-sectional view of FIG. It is a partial expanded cross-sectional view of the packaging bag which shows embodiment different from embodiment shown in FIG. It is a top view which shows the state which has opened the packaging bag shown in FIG. It is a top view which shows the state which opened the packaging bag shown in FIG. It is a top view of the packaging bag which shows another embodiment of this invention. It is a top view which shows the state which opened the packaging bag shown in FIG. It is a top view of the packaging bag which shows another embodiment of this invention. FIG. 3 is a partial enlarged cross-sectional view of a packaging bag showing an embodiment further different from the embodiment shown in FIG. 2. FIG. 10 is a partial enlarged cross-sectional view of a packaging bag showing an embodiment different from the embodiment shown in FIG. 9. It is a figure which shows another embodiment of this invention, Comprising: It is a top view of the packaging bag of a form different from the packaging bag shown in FIG. It is a top view of the packaging bag which shows another embodiment of this invention. It is a top view of the test piece for a measurement used with the stopping force test of a tear end, Comprising: (a) And (b) shows the test piece which concerns on this invention, respectively, (c) shows the test piece which concerns on a conventional product. . It is a top view of the test piece for a measurement used by the damage resistance test of an adhesion part, (a) and (b) show the test piece concerning the present invention, respectively, (c) shows the test piece concerning a conventional product. Show. It is a top view of the test piece for a measurement used by a tear propagation test, Comprising: (a) shows the test piece which concerns on this invention, (b) shows the blank test piece. It is a top view of the test piece for a measurement used by the tear stop force test of the curved end part of a tear stop line, (a) shows the test piece which curved the end part of the tear stop line, and (b) is a tear The test piece which does not curve the terminal part of a stop line is shown.

Explanation of symbols

10, 12, 44, 46, 64 Sheet material 14a, 14b, 14c, 14d, 66a, 66b, 66c Adhesion 16, 20, 48, 52 Base material layer 18, 22, 50, 54 Sealant layer 24, 70 For opening Notch 26, 68 Convex adhesive part 28, 72 Virtual tear line 30, 32, 38, 42, 56, 58, 60, 62, 74, 75 Tear stop line 34 Spout 36, 40 Tear piece part 42a, 42b Tear stop End of line

Claims (7)

The sheet material in which the base material layer and the sealant layer are laminated is overlapped with the sealant layer as the inner surface side, and the edges of the sheet material are bonded to each other to form a sealed bag. In a packaging bag that is opened by tearing from the adhesive part on the side,
A packaging bag, wherein a tear stop line is formed in at least one base material layer of sheet materials adhered to each other at a front adhesive portion in a tear direction so as to intersect the tear direction in a plan view. The sheet material in which the base material layer and the sealant layer are laminated is overlapped with the sealant layer as the inner surface side, and the edges of the sheet material are bonded to each other to form a sealed bag. In a packaging bag that is opened by tearing from the adhesive part on the side,
A tear stop line was formed on each of the base material layers of the two sheet materials adhered to each other at the front adhesive portion in the tearing direction so as to intersect the tearing direction in plan view and shifted in the tearing direction. A packaging bag characterized by that. A convex adhesive part is formed by partially adhering the sheet material so as to enter the inside from one side that becomes the opening side, and the tear stop line is formed in the convex adhesive part, and the vicinity of the one side that becomes the opening side The packaging bag according to claim 1 or 2, wherein a spout is formed by tearing the adhesive from the adhesive portion on one side to the convex adhesive portion through the non-adhesive portion. The packaging bag according to any one of claims 1 to 3, wherein an opening notch is formed at a tear start position of the adhesive portion on one side. The packaging bag according to any one of claims 1 to 4, wherein the tear stop line is formed such that a direction from one end closer to the other side on the opening side toward the other end forms an obtuse angle. The packaging bag according to any one of claims 1 to 5, wherein an end portion of the tear stop line on a side away from one side which is an opening side is curved. The packaging bag according to any one of claims 1 to 6, wherein an end of the tear stop line that is closer to one side on the opening side is curved.

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