JP2018127281A - Packing bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packing bag capable of being torn and opened easily, having a beautiful tear opening part, and capable of being opened easily by gripping the bag by fingers by generating a step on the tear opening part.SOLUTION: The packing bag is formed of a laminate 10 having outer layers, intermediate layers, and inner layers having end edge heat adhesive parts 2 respectively on facing end edges. The one outer layer of the laminate comprises a first cut line 3 started from one outer edge of the end edge heat adhesive parts and terminated in the other outer edge having the same position in a direction which is parallel to the start point and the end edge heat adhesive part, and the other outer layer of the laminate has a second cut line 3' started from the one outer edge of the end edge heat adhesive part and terminated in the other outer edge having the same position in a direction which is parallel to the end edge heat adhesive part. The first cut line is formed of a cut line 30C expanding to an upper end side and a cut line 30D expanding to a lower end side with respect to a virtual straight line when the virtual straight line connecting the start point and the terminal point on an approximately central part of the packing bag is assumed in a plane view of the packing bag.SELECTED DRAWING: Figure 3

Description

  The present invention can be easily torn and opened, and the tear opening when it is torn and opened is beautiful and the outline of the tear opening is different so that a step for easily opening with fingers can be formed. The present invention relates to a packaging bag, and further to a packaging bag having a resealing function by providing a synthetic resin bite composed of a male member and a female member that are engaged with each other at opposing positions on the inner surface of the packaging bag. .

  Conventionally, in a packaging bag composed of a three-sided seal type, a four-sided seal type, or a standing type laminate, the left side of the outer layer on the front side composed of the laminate constituting the packaging bag is The outer edge of the edge thermal bonding part is the starting point, and the outer edge of the right edge thermal bonding part is the end point (the vertical position of the starting point and the end point [the direction parallel to the left and right edge thermal bonding parts] is the same) A continuous first cut line is formed, and the outer edge of the second surface on the back side constituted by the laminate constituting the packaging bag is used as a starting point from the outer edge of the left edge thermal bonding portion, and the right edge heat Form a continuous second cut line with the outer edge of the bonded portion as the end point (the vertical position of the start point and the end point [the direction of the left and right edges parallel to the thermal bond portion] is the same), and the packaging bag from the front side On the rectangular plane of the first surface on the near side in plan view Packaging along the first cut line and the second cut line by partially changing the formation position of the second cut line on the rectangular plane of the first cut line and the second surface on the back side When the upper end of the bag is torn open in the left-right direction (the direction orthogonal to the left and right edge thermal bonding portions), the outer side of the cut surface of the front side and the rear side of the back side forming the tear opening There has been proposed a packaging bag in which an opening for taking out contents by making a difference in a tear opening by making the outer surface of two cut surfaces different (for example, see Patent Document 1).

  Furthermore, a packaging bag is also proposed in which a step is created in the same kind of tear opening to facilitate opening when the contents are taken out, and a packaging bag having a reseal function (see, for example, Patent Document 2). ).

  Here, as in the second embodiment of the packaging bag described in Patent Document 1 or the packaging bag described in Patent Document 2, one of the first cut line and the second cut line (for example, on the back side) An irregular (non-linear) score line in which the first score line provided on the second surface is a straight score line and the other (for example, the second score line provided on the second surface on the near side) is swollen to the lower end side. By doing so, the straight outline of the cut surface of one surface (for example, the second surface on the back side) along the straight cut line and the other surface along the cut line swollen to the lower end side ( For example, a tongue-shaped step due to a combination of the cut surface of the first surface on the front side with an arcuate outline is most desirable as a step for easily opening with a finger.

  However, when opening the packaging bag, if the surface with the irregular cut line of the packaging bag is turned forward, the area on the upper end side from the cut line is picked and torn forward, along the irregular cut line An arc-shaped tear line that swells to the lower end side is formed, but some users open the bag with the irregular cut line side of the packaging bag facing forward and the upper end from the cut line. In some cases, the tearing line may be removed from the irregular cut line, and the initially planned tongue piece-shaped step may not be formed.

JP 2005-289396 A JP 2003-104394 A

It is a first object of the present invention to provide a standing type packaging bag having an opening function capable of forming a step in a tear opening even if it is torn to the near side or to the back side.
Also, a packaging bag having physical properties required for a packaging bag, such as mechanical toughness, bending resistance, puncture resistance, impact resistance, cold resistance, heat resistance, and chemical resistance. It is a second subject to provide
Moreover, it is a third object of the present invention to provide a packaging bag having a resealing function by providing a synthetic resin occlusion device composed of a male member and a female member that are engaged with each other at opposing positions on the inner surface of the packaging bag. Let it be an issue.

In order to achieve the above object, the present inventor described in claim 1
It is a packaging bag composed of a rectangular laminate having at least an outer layer and an inner layer made of a heat-adhesive resin in order from the outside, and the inner layer of the laminate is arranged so as to constitute the inside thereof,
The packaging bag includes a first surface and a second surface of the same shape facing each other in the thickness direction,
Based on the first surface and the second surface, the first surface side and the second surface side in the thickness direction of the packaging bag are defined,
Based on the case where the packaging bag is viewed in plan from the first surface side, the vertical and horizontal directions of the packaging bag are defined,
The left edge thermal bonding portion and the right edge thermal bonding are formed such that the first surface and the second surface are respectively formed at positions where at least a pair of the left edge and the right edge are opposed to each other. It is in a joined state at the part,
The packaging bag is provided with an opening means for tearing open in the left-right direction,
The unsealing means includes a left-side unsealing start guiding portion, a right-side unsealing start guiding portion, and a step forming portion sandwiched between the left and right unsealing start guiding portions,
The step forming portion is a first-surface-side annular score line formed in an outer layer of a first surface, which is formed by an upper-side cut line and a lower-side cut line that branches off from the left-hand point and converges on the right-hand point. And a second surface side linear score line formed in the outer layer of the second surface consisting of one score line that proceeds in the left-right direction,
When the packaging bag is viewed in plan from the first surface side, the second surface side linear score line is a positional relationship in the vertical direction sandwiched between the score line that swells upward and the score line that swells downward. With
When a tear opening is made in the left-right direction along the opening means, the outer surface of the cut surface of the first surface and the outer surface of the cut surface of the second surface that form the tear opening at the step forming portion are made different. Thus, a step is generated in the tear opening.

Furthermore, the present invention described in claim 2 is the packaging bag according to claim 1,
The outer layer provided in the laminate is a biaxially stretched film using any one of a polyester resin, a polyamide resin, and a polypropylene resin, and the biaxially stretched film includes at least a printing layer. is there.

Furthermore, the present invention described in claim 3 is the packaging bag according to any one of claims 1 to 2,
The inner layer of the laminate includes low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-α olefin copolymer, ethylene-propylene copolymer, ethylene. A vinyl acetate copolymer, an ionomer resin, an acid copolymer of ethylene and acrylic acid, and an ester copolymer of ethylene and acrylic acid ester.

Furthermore, the present invention according to claim 4 is the packaging bag according to any one of claims 1 to 3,
The laminate is provided with an intermediate layer for imparting physical properties required when used as a packaging bag, and the intermediate layer is a layer for imparting physical properties required when used as a packaging bag. It is made of a film or resin layer of polyolefin such as polyester, polyamide, polyethylene, polypropylene, or ethylene-propylene copolymer, or a combination of the film or the resin layer.

Furthermore, this invention of Claim 5 is a packaging bag as described in any one of Claim 1 thru | or 4, Comprising:
A synthetic resin occlusion device comprising a protruding male member and a concave female member that are engaged with each other is provided at a position opposite to the inner surface of the packaging bag below the opening means,
The male member and the female member are engaged to provide a reseal function.

  According to the invention described in claims 1 to 3, when the first surface of the packaging bag is directed toward the front, the upper end side region from the opening means is grasped with a finger and torn toward the front, Of the first and second surfaces constituting the packaging bag, a tear line is formed on the first surface on the front side along one score line on the starting side and a score line that swells downward. When the upper end side of the means is picked with a finger and torn to the back side, the first side and the second side constituting the packaging bag in the step forming portion are the first side on the front side. Since the tear line is formed along the cut line and the cut line that swells upward, the tear line can be torn without being detached from the opening means.

  Further, according to the invention described in claim 4 and the invention described in claim 5 which refers to the invention, the film comprises a film such as polyester, polyamide, polyethylene, polypropylene, ethylene-propylene copolymer or the like, or a resin layer. Or, because it has an intermediate layer made of a combination of the film and the resin layer, the physical properties required when forming a packaging bag, for example, mechanical toughness, flex resistance, puncture resistance, impact resistance , Cold resistance, heat resistance, and chemical resistance can be provided as a packaging bag.

  Further, according to the invention described in claim 5, the protruding male member and the concave female member that mesh with each other at opposing positions on the inner surface of the packaging bag below the opening means of the packaging bag. And a plastic bag having a reseal function by engaging the male member and the female member.

It is a top view which shows diagrammatically the positional relationship of the cut line of the packaging bag concerning this invention, and an occlusion tool. It is a figure which shows the XX sectional view of FIG. It is a principal part top view which shows schematically 1st Embodiment of the score line formed in the packaging bag concerning this invention. (A) is a figure which shows the YY sectional view schematically of FIG. 3, (b) is a figure which shows the ZZ sectional view schematically of FIG. It is a principal part top view which shows schematically 2nd Embodiment of the score line formed in the packaging bag concerning this invention. It is an opening figure of the state which left one side edge thermal adhesive part of the packaging bag shown in FIG.

The above-described present invention will be described in detail below with reference to the drawings.
1 is a plan view schematically showing the positional relationship between a cut line and a bite of a packaging bag according to the present invention, FIG. 2 is a diagram schematically showing a cross section taken along line XX of FIG. 1, and FIG. The principal part top view which shows diagrammatically 1st Embodiment of the cut line formed in this packaging bag, FIG.4 (a) is a figure which shows the YY sectional view schematically of FIG. 3, (b) is FIG. FIG. 5 is a plan view schematically showing a second embodiment of the score line formed in the packaging bag according to the present invention, and FIG. 6 is the packaging shown in FIG. 1 is a packaging bag in which one side edge thermal bonding portion of the bag is left, 1 in the figure is a packaging bag, 2 is an edge thermal bonding portion, 2 ′ is a side edge thermal bonding portion, and 2 ″ is an upper side.・ Lower edge thermal bonding part, 3 is a first cut line, 3 ′ is a second cut line, 10 is a laminate, 11 is an outer layer, 12 is an intermediate layer, 13 is an inner layer, 20 is a synthetic resin bite, 21 Is the male member of the ridge, 22 is concave Female members 30A, 30B are first straight cut lines, 30C, 30E are first upper cut lines, 30D, 30F are first lower cut lines, 31A, 31B, 31C are second straight cut lines, α indicates a cut line forming region, and β indicates a bite forming region.

  FIG. 1 is a plan view schematically showing the positional relationship between a score line and a bite of a packaging bag according to the present invention, and FIG. 2 is a diagram schematically showing a cross section taken along line XX of FIG. The outer layer 11, the intermediate layer 12 made of aluminum foil, and the inner layer 13 made of a heat-adhesive resin layer are laminated, the inner layers 13 of the rectangular laminate 10 are overlapped with each other, and the four peripheral edges are thermally bonded. It is a four-side seal type packaging bag sealed with a heat bonding part 2. In the present specification, among the edge thermal bonding portions 2, a set of the edge thermal bonding portions 2 positioned in the left-right direction in FIG. 1 and the like are referred to as side edge thermal bonding portions 2 ′. 1 and the like, the pair of edge thermal bonding portions 2 positioned in the vertical direction are referred to as upper and lower edge thermal bonding portions 2 ". The packaging bag 1 is a rectangular laminated layer constituting the packaging bag 1. A cut line forming region α in which a first cut line 3 and a second cut line 3 ′ are formed in one outer layer and the other outer layer of the body 10 so that the forming positions are different in a plan view of the packaging bag 1. And a synthetic resin occlusion tool 20 comprising a protruding male member 21 and a concave female member 22 which are engaged with each other on the lower end side (lower end edge thermal bonding portion 2 ″ side) of the cut line forming region α. And an articulator forming region β.

  Next, embodiments of the cut lines (the first cut line 3 and the second cut line 3 ') formed in the packaging bag 1 will be specifically described in detail. FIG. 3 is a plan view of an essential part schematically illustrating a first embodiment of a score line formed in the packaging bag according to the present invention, and FIG. 4A is a diagram schematically illustrating a cross section along line YY in FIG. (B) is a figure which shows the ZZ line | wire cross section of FIG. 3 schematically, Comprising: A cut line is one outer layer 11 of the laminated body 10 which comprises the packaging bag 1, and the said side end heat-bonding part 2 'is shown. A phase (position) in a direction orthogonal to the side edge thermal bonding portion 2 ′ of the packaging bag 1 in a direction orthogonal to the side edge thermal bonding portion 2 ′ from one outer edge and the other outer edge (for example, The first linear cut lines 30A and 30B extending at the same distance) from the outer edge of the upper edge thermal bonding part 2 ″ and the first linear cut lines 30A and 30B swell to the upper end side connecting the respective ends. A first cut line 3 including a first upper cut line 30C and a first lower cut line 30D that swells to the lower end side, and the packaging bag 1 are configured. In the other outer layer 11 of the laminated body 10, the first linear shape extends from one outer edge and the other outer edge of the side edge thermal bonding portion 2 ′ in a direction perpendicular to the side edge thermal bonding portion 2 ′. The second straight cut lines 31A and 31B extending in the same phase (position) and length as the cut lines 30A and 30B, and the second straight cut lines 31A and 31B are connected to each other by a straight line. The second cut line 3 'is composed of a straight cut line 31C.

  The packaging bag 1 configured as described above is formed by gripping the outer edge of the side edge thermal bonding portion 2 ′ where the first cut line 3 intersects, for example, the region on the upper end side from the left side in FIG. When tearing to the near side from the first cut line, of the two laminated bodies constituting the packaging bag, the front laminate is linearly along the first straight cut line 30A and the second straight cut line 31A. As a result of tearing integrally and reaching the branch point of the first lower end side cut line 30D in which the tear opening line swells toward the lower end side and the first upper end side cut line 30C swelling toward the upper end side, the first tearing line opens. The second straight cut line 31 is torn along the first lower cut line 30D from the straight cut line 30A and the second straight cut line 31C. First straight cut line 30B and second straight cut line 31 Thus, the first lower cut line 30D is integrated along the first linear cut line 30B, and the second linear cut line 31C is integrated linearly along the second linear cut line 31B. Torn and opened. As shown in FIG. 6, the tear opening line is composed of a smooth curve and a straight line, and the opening can be made beautiful. In addition, the tear opening line formed by the first lower cut line 30D and the second straight cut line 31C can be easily picked and opened from one side of the laminate 10 in order to generate a step. it can.

  Further, although illustration or detailed explanation is omitted, when the packaging bag 1 is opened in FIG. 3, if the region on the upper end side from the left side in FIG. From the first straight cut line 30A as a result of tearing to the far side, reaching the branch point of the first lower cut line 30D bulging to the lower end side and the first upper cut line 30C bulging to the upper end side. Other than being torn along the first upper end side cut line 30C, it is torn and opened in the same manner as in the case of tearing to the near side.

  FIG. 5 is a plan view schematically showing a second embodiment of the cut line formed in the packaging bag according to the present invention. In FIG. 3, the first upper end side cut of the first cut line is shown. Although the eye line 30C and the first lower end side cut line 30D are shown in an arc shape, the first upper end side cut line 30E and the lower end side bulge to the upper end side of a substantially U-shape instead of the arc shape. The first lower end side cut line 30F is the same as FIG. 3, and the description thereof is omitted. In the case of the second embodiment, the first upper cut line 30E or the first lower cut line 30F is substantially U-shaped with respect to the first straight cut line 30A or 30B of the first cut line 3. Is preferably 160 to 175 degrees.

  In FIG. 3, the first upper end cut line 30C and the first lower end cut line 30D have an arc shape, and in FIG. 5, the first upper end cut line 30E and the first lower end cut line. Although 30F was illustrated as a substantially U-shaped shape, the first upper end side cut line and the first lower end side cut line are not limited to this, and are substantially U-shaped or the like. Alternatively, the shapes of the first upper end side cut line and the first lower end side cut line may be different.

  Further, the first upper end side cut line 30C and the first lower end side cut line 30D that connect the respective ends of the first linear cut line 30A and the first linear cut line 30B, or the first upper end side cut line. 30E and the first lower end side cut line 30F are shown as a single cut line, but the number is not limited to one, and each may be composed of a plurality of lines, or the number of the upper end side and the lower end side may be different. It may be. Further, the interval between the score lines when a plurality of lines are provided is preferably 1 mm or less. It should be noted that one step of the laminated body constituting the packaging bag 1 and the other are designed with fingers easily so that the level difference in the tear opening of the first cut line 3 and the second cut line 3 ′ is 6 mm or more. This is preferable because it can be picked.

  3 and 5, the second cut line 3 ′ is shown as a single straight cut line, but one or more straight cut lines on both sides so as to sandwich the second cut line 3 ′. May be a plurality of linear cut lines, and an arcuate upper end side in place of the second straight cut lines 31C constituting the second cut lines 3 ′ and / or In any case, the second cut line 3 ′ may be the first upper cut line that bulges to the upper end side of the first cut line 3. It is preferable to configure so as to be located in a region between the first lower end side cut lines that bulge to the lower end side.

  Further, the position where the first straight cut line 30A (or the second straight cut line 31A) intersects the outer edge of the side edge thermal bonding portion 2 ′, or the first straight cut line 30B ( Alternatively, at the position where the second linear cut line 31B) intersects with the outer edge of the side edge thermal bonding portion 2 ′, a cut or scar group such as I-shape, V-shape, U-shape, turtle shell shape, etc. By providing the opening start means, it is possible to make the opening easier both visually and functionally.

  In addition, the four-side seal type packaging bag has been described so far, but in short, a packaging bag having a configuration in which at least one edge thermal bonding portion is formed at the opposed position of a pair of opposed edges, for example, three-way It may be a seal type or a standing type packaging bag. Further, it goes without saying that all the categories not departing from the gist of the present invention are included in the present invention.

  Next, the laminated body 10 which comprises the packaging bag 1 is demonstrated. As the outer layer of the laminated body 10, since it becomes a basic material constituting the packaging bag 1, a synthetic resin film having excellent properties in mechanical, physical, chemical and the like can be used. For example, polyester Resins such as those based on polyamide, polyamide and polypropylene can be used. Moreover, as a film using these resin, the stretched film extended | stretched to the biaxial direction is suitable. This is because usually the outer layer 11 is often printed, and printability is required. The thickness of the film constituting the outer layer 11 may be determined in consideration of cost and the like, but is generally about 12 to 25 μm.

  Moreover, as an aluminum foil used for the intermediate | middle layer 12 of the said laminated body 10, the annealed aluminum foil is suitable, and the thickness is about 6-15 micrometers.

  The inner layer 13 of the laminate 10 may be any layer formed from a heat-adhesive resin that can be melted by heat and welded to each other. For example, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-α olefin copolymer, ethylene-propylene copolymer , Ethylene-vinyl acetate copolymer, ionomer resin, acid copolymer of ethylene and acrylic acid, ester copolymer of ethylene and acrylic acid ester, and the like. Further, the thickness of the film constituting the inner layer 13 may be determined in consideration of required physical properties and costs.

  The laminate 10 has physical properties required when forming a packaging bag between the intermediate layer 12 and the inner layer 13, for example, mechanical toughness, bending resistance, puncture resistance, impact resistance, In order to impart physical properties such as cold resistance, heat resistance, chemical resistance, etc., a strength reinforcing layer made of a film or resin layer of polyolefin such as polyester, polyamide, polyethylene, polypropylene, ethylene-propylene copolymer is provided. The strength reinforcing layer may be a combination of the film and the resin layer, and the thickness may be determined in consideration of required physical properties and costs.

  Moreover, as a lamination | stacking method of each layer of the said laminated body 10 which comprises the packaging bag 1 of this invention, what is necessary is just to laminate | stack suitably using well-known lamination methods, such as a sandwich lamination method and a dry lamination method. The first cut line 3 and the second cut line 3 ′ may be physically formed using a rotary die cutter, but preferably the laminate 10 is formed using a pulsed laser or the like. Later, the outer layer 11 is formed. As a kind of laser used for this, a carbon dioxide laser, a YAG laser, a semiconductor laser, an argon ion laser, etc. are possible, and it is not particularly limited.

DESCRIPTION OF SYMBOLS 1 Packaging bag 2 Edge thermal bonding part 2 'Side edge thermal bonding part 2 "Upper and lower edge thermal bonding part 3 1st cut line 3' 2nd cut line 10 Laminated body 11 Outer layer 12 Intermediate layer 13 Inner layer 20 Synthetic resin Made occlusal tool 21 convex male member 22 concave female member 30A, 30B first straight cut line 30C, 30E first upper cut line 30D, 30F first lower cut line 31A, 31B, 31C second Straight cut line α Cut line forming region β Articulating device forming region

Claims (5)

It is a packaging bag composed of a rectangular laminate having at least an outer layer and an inner layer made of a heat-adhesive resin in order from the outside, and the inner layer of the laminate is arranged so as to constitute the inside thereof,
The packaging bag includes a first surface and a second surface of the same shape facing each other in the thickness direction,
Based on the first surface and the second surface, the first surface side and the second surface side in the thickness direction of the packaging bag are defined,
Based on the case where the packaging bag is viewed in plan from the first surface side, the vertical and horizontal directions of the packaging bag are defined,
The left edge thermal bonding portion and the right edge thermal bonding are formed such that the first surface and the second surface are respectively formed at positions where at least a pair of the left edge and the right edge are opposed to each other. It is in a joined state at the part,
The packaging bag is provided with an opening means for tearing open in the left-right direction,
The unsealing means includes a left-side unsealing start guiding portion, a right-side unsealing start guiding portion, and a step forming portion sandwiched between the left and right unsealing start guiding portions,
The step forming portion is a first-surface-side annular score line formed in an outer layer of a first surface, which is formed by an upper-side cut line and a lower-side cut line that branches off from the left-hand point and converges on the right-hand point. And a second surface side linear score line formed in the outer layer of the second surface consisting of one score line that proceeds in the left-right direction,
When the packaging bag is viewed in plan from the first surface side, the second surface side linear score line is a positional relationship in the vertical direction sandwiched between the score line that swells upward and the score line that swells downward. With
When a tear opening is made in the left-right direction along the opening means, the outer surface of the cut surface of the first surface and the outer surface of the cut surface of the second surface that form the tear opening at the step forming portion are made different. A packaging bag that creates a step in the tear opening.   The outer layer included in the laminate is a biaxially stretched film using any one of a polyester resin, a polyamide resin, and a polypropylene resin, and the biaxially stretched film includes at least a printing layer. The packaging bag according to 1.   The inner layer of the laminate includes low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-α olefin copolymer, ethylene-propylene copolymer, ethylene. A vinyl acetate copolymer, an ionomer resin, an acid copolymer of ethylene and acrylic acid, and an ester copolymer of ethylene and acrylic acid ester are used. Packaging bag as described in.   The laminate is provided with an intermediate layer for imparting physical properties required when used as a packaging bag, and the intermediate layer is a layer for imparting physical properties required when used as a packaging bag. The film is made of a polyolefin film such as polyester, polyamide, polyethylene, polypropylene, or ethylene-propylene copolymer, or a resin layer, or a combination of the film or the resin layer. The packaging bag as described in any one of Claims. A synthetic resin occlusion device comprising a protruding male member and a concave female member that are engaged with each other is provided at a position opposite to the inner surface of the packaging bag below the opening means,
The packaging bag as described in any one of Claims 1 thru | or 4 provided with a reseal function by biting the said male member and the said female member.