JP6314444B2 - Back packaging bag - Google Patents

Description

  The present invention relates to a back-attached packaging bag having a back-attached portion, and particularly to a back-attached packaging bag having easy-openability.

  2. Description of the Related Art Conventionally, back-attached packaging bags that store solid contents have been widely used from the viewpoint of portability and handling. In general, this packaging bag is formed in a cylindrical shape by sealing the inner surfaces of both edges of a single film in a palm-like shape, then sealing the lower end to form a ground seal portion, and then forming a solid state from the opening at the upper end. The contents are filled, and the upper end is sealed to form a top seal portion.

  Conventionally, in order to open such a packaging bag, for example, there is a packaging bag using a laminated sheet composed of at least a base film layer and a sealant layer having an easy peel property.

  Moreover, there exists a thing which provided the notch which has an easy-cut property and uses a uniaxially stretched film for a base film layer, and is an opening start part in a back sticking part. In addition, there are some which are not provided with a notch, and the top seal portion and the ground seal portion have a saw-blade shape and are easily cut in the top and bottom direction.

  Further, for example, as shown in FIG. 10A, a first easy-opening line 70 that is an opening start part is formed in the back pasting part 5, and the first easy-opening line is continuously formed in the circumferential direction of the trunk part. There is a back-wrapped packaging bag 80 in which two unsealed lines 71 are formed. As shown in FIG. 10-2, the first opening line 70 of the back pasting portion is torn, and then the second opening line 71 is torn and opened in the circumferential direction. After opening, an opening piece 31 is generated.

  However, since such a packaging bag must be opened with both hands, one hand is closed and cannot be opened with both hands, or it cannot be opened by a person who has difficulty with one hand. In addition, there is a problem that the cut open pieces become garbage.

  In addition, there is a proposal of a back-wrapped packaging bag that can be opened with one hand and the opened piece does not become garbage. This provides a weakening part in the area | region which the contents of a packaging bag do not occupy (patent document 1).

  However, in order to cut the weakened portion with one hand, there is a problem that the thumb slides on the surface of the packaging bag and cannot be opened successfully.

  Therefore, there is a demand for a back-attached packaging bag that can be easily opened without sliding with one hand and the opened piece does not become garbage.

WO2009 / 090930

  In view of the above problems, it is an object of the present invention to provide a back-attached packaging bag that can be easily opened without sliding with one hand and the opened piece does not become garbage.

  In order to solve the above-mentioned problems, the inventors have conducted intensive studies and completed the present invention.

In the invention according to claim 1 of the present invention, at least the inner surfaces of both end edges of the laminated sheet composed of the base film layer / adhesive layer / sealant layer are sealed to form a back pasting portion to form a cylinder, and the back pasting In the back-attached packaging bag in which the inner surface of the edge perpendicular to the part is sealed to form a top-and-bottom seal part, and the cylindrical part for storing the solid content is formed,
A weakened portion is formed on the portion of the tubular portion that is not occupied by the contents, except for the back pasting portion along the circumferential direction of the tubular portion,
An anti-slip part is formed on the surface of the base film layer around the weakened part ,
The weakened portion is formed from a convex shape portion formed toward the lower end direction of the cylindrical portion, and a straight line formation portion or a curve formation portion extending obliquely upward from both ends of the convex shape portion,
The anti-slip part is formed on the surface of the base film layer on the convex part side of the straight line connecting the ends of the weakened part at a position separated from the top and bottom seal part. It is a back pasting packaging bag.

The invention according to claim 2 of the present invention, the position corresponding to the weakened portion of the sealant layer, a back lined packaging bag of claim 1 Symbol mounting, characterized in that the scar portion is formed.

The invention according to claim 3 of the present invention is the back-packed packaging bag according to claim 1 or 2 , wherein an uneven portion is formed at a position of the sealant layer with respect to the anti-slip portion.

  The back-attached packaging bag of the present invention can be easily opened without sliding with one hand, and the opened piece does not become garbage.

  In the back-attached packaging bag of the present invention, a weakened portion is formed in a portion that is not occupied by the contents of the tubular portion, except for the back-attached portion, along the circumferential direction of the tubular portion. By providing the anti-slip part on the surface of the base film layer in the peripheral part of the weakened part, it is possible to concentrate the shearing force on the weakened part and to tear it without sliding with one hand. That is, the anti-slip part is sandwiched between the thumb's belly and the back side corresponding to the anti-slip part (the back seal forming part) is sandwiched between the index finger, middle finger, ring finger, etc. It can be done.

Also, weakened portions, and the convex portion formed toward the lower end direction of the cylindrical portion, from both ends of the convex-shaped portion, by being formed from a linear form portion or curved forming portions extending obliquely upward direction The shearing force is concentrated on the convex portion, and then the shearing force is transmitted from both ends of the convex portion to the straight line forming portion or the curve forming portion extending obliquely upward, and the cylindrical portion is cut in the circumferential direction to open the opening. A mouth can be formed. Since the weakened portion is not formed in the back seal portion, the cut open piece is connected to the packaging bag and is not separated. That is, the opened piece does not become garbage.

  Moreover, since the scar part is formed in the sealant layer corresponding to the weakened part, it can be further easily torn when finger snapping is performed.

  Further, since the uneven portion is formed in the sealant layer corresponding to the anti-slip portion, the weakened portion is easily torn when finger snapping is performed, and the opening can be easily formed.

It is explanatory drawing which shows an example of the lamination sheet (surface) before forming the back bonding packaging bag of this invention. It is explanatory drawing which shows an example of the state which made the lamination sheet of FIG. 1 the cylinder shape. It is explanatory drawing which shows one Embodiment of the back bonding packaging bag of this invention. It is explanatory drawing which shows an example of the shape of a weakening part. It is sectional drawing which shows an example of the layer structure around the weakening part of a lamination sheet. It is sectional drawing which shows an example of the other layer structure of a lamination sheet. It is explanatory drawing which showed the state which opens the back bonding packaging bag of FIG. 3 with one hand. It is explanatory drawing which showed the state which opens the back bonding packaging bag of FIG. 7 with one hand. It is explanatory drawing which showed the state which opened the back bonding packaging bag of FIG. It is explanatory drawing which shows an example of the conventional back sticking packaging bag.

  Below, the form for implementing this invention is demonstrated.

  Drawing 1 is an explanatory view showing an example of a lamination sheet (surface) before forming a backfitting packaging bag of the present invention. The laminated sheet 60 is formed with end portions 2 and 2 that form back pasting portions, and a weakened portion 10 having a convex shape toward the lower end 4 is formed at the upper center portion. Also. An anti-slip part 20 having anti-slip properties is formed on the weakened part 10.

  FIG. 2 is an explanatory view showing an example of a state in which the laminated sheet of FIG. 1 is formed into a cylindrical shape. The end portions 2 and 2 of the laminated sheet are formed into a cylindrical shape by joining the same surfaces into a palm shape, and the back end portion 5 is formed on the side portion of the cylindrical portion 8 by heat-sealing the combined end portions. It is a packaging bag. The weakening part 10 and the anti-skid part 20 are arranged and formed in a part where the contents are not occupied. There is a weakened portion 10 on the front surface of the tube portion, and an anti-slip portion 20 is disposed above the weakened portion.

  FIG. 3 is an explanatory view showing one embodiment of the back-attached packaging bag of the present invention. After sealing the lower end 4 of the cylinder part to form the ground seal part 7 and then filling the solid content from the opening at the upper end, the upper end is sealed to form the top seal part 6. A portion 40 where the contents are occupied and a portion 41 where the contents are not occupied are formed in the cylindrical portion 8 of the packaging bag. The weakening part 10 and the antiskid part 20 are formed in the part 41 where the contents are not occupied. The anti-slip part 20 is arranged on the upper side of the weakening part 10.

  A force is applied so that the anti-slip portion 20 is crimped by the belly of the thumb and pushed into the cylindrical portion. As a result, the shearing force concentrates on the weakened portion and cutting occurs. Further, the anti-slip portion is pushed upward with the belly of the thumb, and the shearing force is concentrated on the weakened portion to cause cutting. Since the straight line forming portion is formed except for the back pasting portion, the back pasting portion is not torn, and the cut open piece does not become dust.

FIG. 4 is an explanatory diagram illustrating an example of the shape of the weakened portion. Weakened section 10, a convex portion 11 formed toward the tubular portion lower direction, from both ends of the convex-shaped portion 11, are formed from the linear form part 12 which extends obliquely upward direction. The convex portion 11 is preferably a portion where stress concentrates when opened. Shear cutting is concentration occurs in the convex portion 11, from both ends of the force convex portion 11, transmitted to the linear form part 12 extending obliquely upward direction is the circumferential direction of the cylindrical portion will be torn .

Moreover, as a shape of the convex-shaped part 11, the shape which has a part which can concentrate a shearing force is preferable. In particular, a convex shape portion that is easy to open and is formed toward the lower end of the tube portion is preferable. FIG. 4A shows an example of an arc shape. In addition, an example of a convex portion that is a polygonal line bent to form one corner as shown in FIG. 4-2, a convex shape bent to form two corners as shown in FIG. 4-3 An example of a part is given. From both ends of the convex portion 11, the shape of the linear portion 12 extending obliquely upward direction may be a line or curve, but a straight line is preferable from the transfer of stress.

In particular, the width W of the convex forming portion shown in FIG. 4A is desirably 20 to 80 mm, and the height H is desirably 10 to 40 mm (see Test Example 1). Also (see Test Example 2) from both ends of the convex portions, straight forming portion extending obliquely upward direction, the inclination angle θ is with respect to the circumferential direction X, preferably in the range of 15 to 45 °. If it is in this range, it will become easy to concentrate a shear force on a convex-shaped part, and opening of a packaging bag will become easy. Since the straight line forming portion is easily cut with one hand, the packaging bag can be easily opened. Test Example 1 and Test Example 2 were performed in the same manner as Example 1 described later, and were tested by an evaluation method described later. Test Example 1 is shown in Table 1, and Test Example 2 is shown in Table 2.

図５は、積層シートの弱化部周辺の層構成の一例を示す断面図である。積層シート５０は、少なくとも、基材フィルム層５１／接着層５２／シーラント層５３からなっている。図５−１は、基材フィルム層５１を貫通する弱化部１０が形成されている。また弱化部１０の周辺の基材フィルム層５１の表面には防滑部２０が形成されている。図５−２は、図５−１の弱化部２０に対応するシーラント層５３に傷痕部１３が形成されている。傷痕部１３を形成することで弱化部１０を切り裂き易くすることができる。また、図５−３は、図５−２の防滑部２０に対応するシーラント層５３に凹凸部１４を形成したものである。シーラント層５３に凹凸部を形成することにより、防滑部２０を筒部内部へと押込んだ時に、弱化部をずらし易くなり、開口部を形成し易くすることができる。

FIG. 5 is a cross-sectional view showing an example of the layer configuration around the weakened portion of the laminated sheet. The laminated sheet 50 includes at least a base film layer 51 / an adhesive layer 52 / a sealant layer 53. In FIG. 5A, the weakened portion 10 penetrating the base film layer 51 is formed. An antislip portion 20 is formed on the surface of the base film layer 51 around the weakened portion 10. In FIG. 5B, the scar 13 is formed in the sealant layer 53 corresponding to the weakened portion 20 of FIG. By forming the scar portion 13, the weakened portion 10 can be easily cut. Further, FIG. 5C is a diagram in which the uneven portion 14 is formed in the sealant layer 53 corresponding to the anti-slip portion 20 of FIG. By forming the concavo-convex portion in the sealant layer 53, the weakened portion can be easily shifted and the opening can be easily formed when the anti-slip portion 20 is pushed into the cylindrical portion.

  The method for opening the back-attached packaging bag of the present invention will be described.

  FIG. 7 is an explanatory view showing a state where the back-attached packaging bag of FIG. 3 is opened with one hand. The anti-slip portion 20 is sandwiched between the belly of the thumb 61 of the hand 60 and the back side (the back seal forming portion) corresponding to the anti-slip portion is sandwiched between the index finger, middle finger, ring finger, etc. By adding A, the weakened portion 10 can be cut and opened.

Figure 8 shows a state in which crimp the anti-skid parts 20 by the thumb 61 of the hand 60, tearing the convex portion 11, and the linear form part 12 extending obliquely upward direction from both ends of the convex portion is torn . By doing so, the opening 30 is formed.

  FIG. 9 shows the back-wrapped packaging bag 1 in which the opening 30 is formed. It is easily opened with one hand, and an opening 30 is formed. The cut open piece 31 is connected to the packaging bag and does not become garbage.

  Further, a mode for carrying out the invention will be described in detail.

  The weakened convex portion 11 and the straight line forming portion 12 are formed by a broken line having discontinuous cuts or a solid line having continuous cuts. A broken line is a perforation line. In order to form the perforation line, it can be formed by laser machining or mechanical machining with a metal blade. Examples of the laser include a continuous or pulse oscillation type carbon dioxide laser, YAG laser, and excimer laser. Among these, a carbon dioxide laser can be preferably used.

  Moreover, the scar part 13 can be formed by, for example, laser processing, a metal blade, sandpaper, or the like.

  Moreover, the uneven | corrugated | grooved part 14 can be formed by transferring an unevenness | corrugation to a sealant layer with an embossing board or an embossing roll, for example.

  The anti-slip portion 20 can be formed of a resin such as a urethane resin, an acrylic resin, or a polyester resin. Further, these resins can be formed by mixing acrylic resin beads, polyethylene resin beads or the like, or mixing silica or the like. The anti-slip part can be formed by gravure printing, offset printing, ink jet printing, silk screen printing, or the like using a solution in which these resins are dissolved or dispersed in a solvent. The shape of the anti-slip portion can be a circle, ellipse, square, triangle, or the like. Further, one or more anti-slip portions may be provided. The shape is not particularly limited as long as the slip resistance can be efficiently achieved. The slip angle of the anti-slip part is preferably 14 degrees or more (see Test Example 3). Test Example 3 was performed and tested in the same manner as Example 1 described later. It was tested by the evaluation method described later. Test Example 3 is shown in Table 3.

背貼り包装袋を形成する積層シート５０は、図６に示したように、少なくとも、基材フィルム層５１／接着層５２／シーラント層５３からなる。

As shown in FIG. 6, the laminated sheet 50 forming the back-attached packaging bag includes at least a base film layer 51 / an adhesive layer 52 / a sealant layer 53.

  As the base film layer 51, a heat-resistant plastic film can be used. For example, polyester films such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polyolefin films such as polyethylene (PE) and polypropylene (PP), polyamides such as nylon-6 and nylon-66 Examples include a film (PA), a polystyrene film (PS), a polycarbonate film (PC), a polyacrylonitrile film (PAN), a polyimide film (PI), polyvinyl alcohol (PVA), and polyvinylidene chloride (PVDC). There is no particular limitation as long as it has mechanical strength and dimensional stability. A biaxially stretched film is particularly preferable. The thickness of the base film layer is preferably in the range of 10 to 50 μm and more preferably in the range of 10 to 30 μm in consideration of workability.

  As the sealant layer 53, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), ethylene-methacrylic acid copolymer (EMAA), ethylene- A film made of a polyolefin resin such as ethyl acrylate copolymer (EAA), ethylene-vinyl acetate copolymer (EVA), ionomer, polypropylene (PP) can be used. These resins can be used by forming a film with an extruder. It can be used in a single layer or multiple layers using the above resin. The thickness of the sealant layer is preferably in the range of 30 to 60 μm (see Test Example 4). Test Example 4 was performed in the same manner as Example 1 described later, and was tested by an evaluation method described later. Test Example 4 is shown in Table 4.

接着層５２としては、ドライラミネート用接着剤が使用できる。例えば、二液硬化型ウレタン系接着剤、ポリエステルウレタン系接着剤、ポリエーテルウレタン系接着剤、アクリル系接着剤、ポリエステル系接着剤、ポリアミド系接着剤、エポキシ系接着剤などが使用することができる。貼り合わせ方法としては、ドライラミネート法にて可能である。また、シーラント層を押出し機により押出しながら、アンカー剤（接着剤）を介して貼り合わせることもできる。

As the adhesive layer 52, an adhesive for dry lamination can be used. For example, a two-component curable urethane adhesive, a polyester urethane adhesive, a polyether urethane adhesive, an acrylic adhesive, a polyester adhesive, a polyamide adhesive, an epoxy adhesive, and the like can be used. . As a bonding method, a dry lamination method is possible. Moreover, it can also bond together via an anchor agent (adhesive agent), extruding a sealant layer with an extruder.

Further, if it is necessary to improve various physical properties of the laminated sheet 50, the intermediate layer 54 can be laminated. For example, it can be provided in the case of improving the rigidity, drop strength, piercing strength, etc. of the laminated sheet 50, or in the case of improving the oxygen gas barrier or water vapor barrier when the contents are food. The layer configuration is as shown in FIG. The laminated sheet 50 has a layer configuration of base film layer 51 / adhesive layer 52 / intermediate layer 54 / adhesive layer 52 / sealant layer 53. In the base film layer 51, the weakened portion 10 is formed, and the anti-slip portion 20 is formed on the surface. In the sealant layer 53, a scratched portion is formed at a position corresponding to the weakened portion, and an uneven portion 14 is formed at a position corresponding to the anti-slip portion. In particular, the weakened portion 10 and the scar portion 13 are formed so as not to reach the intermediate layer 54.

  As the intermediate film 54, a polyamide film, a polyethylene terephthalate film, or the like can be used for improving the drop strength or the piercing strength, and an aluminum foil or aluminum vapor deposition is used for improving the oxygen gas barrier or the water vapor barrier. A film, an inorganic oxide vapor deposition film, an inorganic oxide vapor deposition film, an ethylene / vinyl alcohol copolymer film (EVOH), a vinylidene chloride film (PVDC), or the like can be used. Moreover, in order to laminate | stack an intermediate | middle layer, it can bond together by the dry lamination method through an contact bonding layer.

  As the inorganic oxide, metal oxides such as silicon oxide, aluminum oxide, magnesium oxide, calcium oxide, potassium oxide, tin oxide, sodium oxide, boron oxide, titanium oxide, lead oxide, zirconium oxide, and yttrium oxide can be used. Of these, silicon oxide, aluminum oxide, magnesium oxide and the like are preferable from the viewpoint of productivity and price.

  Further, the base film layer 51 can be appropriately provided with a print layer as necessary. The printed layer is made of a solvent, ink made by adding urethane, acrylic, nitrocellulose, rubber and other binder resins, and various pigments, extenders, plasticizers, desiccants, stabilizers, etc. Layer. Characters, designs, etc. can be formed by this print layer. As the printing method, for example, known printing methods such as offset printing, gravure printing, flexographic printing, silk screen printing, and ink jet printing can be used. Moreover, the adhesiveness of a printing layer can be improved by performing the corona treatment or the ozone treatment as the pre-treatment on the surface of the base film layer in advance. Usually, a printing layer is provided on the inner surface of the base film layer.

  Hereafter, the manufacturing method of a back pasting packaging bag is demonstrated easily.

  Using a base film layer, a sealant layer and an intermediate layer having a gas barrier layer as necessary, a laminated sheet is prepared by a dry lamination method or an extrusion lamination method through an adhesive layer.

Next, by cutting the laminated sheet, a band-shaped laminated sheet as shown in FIG. 1 is created. Thereafter, the weakened portion is formed in the base film layer at a predetermined position by laser machining or mechanical machining with a metal blade. Weakening consists convex formed portion toward the lower end direction, a linear form extending obliquely upward direction from both ends of the convex forming portion. The weakened part is not provided at the end part forming the back pasting part. Further, the anti-slip portion is formed by applying the anti-slip resin at a predetermined position above the weakened portion. Further, the weakened portion may be formed after the anti-slip portion is formed.

Next, the both end portions of the laminated sheet are overlapped with the sealant layer on the inside and sealed to form a back pasting portion to create a cylindrical portion. The bottom of the tube is sealed to form a ground seal, and then the solid content is filled from the opening at the top, and the top is sealed to form the top seal, and the back filled with the content. Affixed packaging bags can be created. The back-wrapped packaging bag is divided into a portion where the contents are occupied and a portion where the contents are not occupied, and the weakened portion and the anti-slip portion are arranged in the portion where the contents are not occupied.

The back-attached packaging bag formed in this way is excellent in portability because it can be easily opened without slipping even with one hand. Further, the unsealed piece also remains in the packaging bag, and is excellent in convenience without becoming garbage.

  Hereinafter, specific examples of the present invention will be described.

As a base film layer, an anti-slip portion was formed in a circular shape having a diameter of 20 mm around a predetermined position where the weakened portion was formed on the surface of the poster film 12 μm. At this time, pattern printing was performed on the back side. The anti-slip part was formed by performing gravure printing using a polyurethane resin {Toyo Ink Co., Ltd .: Rio Alpha R Medium)}. The pattern printing was similarly performed by gravure printing using gravure ink. The anti-slip part had a coating amount of 1.5 / m ² (dry) and a sliding angle of 14 degrees. The sliding angle was measured using an AB-502 friction angle measuring machine manufactured by Tester Sangyo Co., Ltd.

  Subsequently, 7 μm of aluminum foil was laminated with sand polyethylene through a polyethylene resin on the pattern printing surface.

  Next, a polyethylene resin was extruded onto the aluminum foil surface to form a sealant layer, thereby forming a laminated sheet. The laminated sheet has a layer structure of anti-slip part / polyester film / printing layer / adhesive layer / polyethylene resin / aluminum foil / adhesive layer / sealant layer (polyethylene resin).

  Next, the continuous laminated sheet is cut to produce a belt-like laminated sheet. A weakened portion was formed at a predetermined position of the laminated sheet by carbon dioxide laser processing. The weakened part was formed by penetrating only the base film layer. When the weakened portion was formed as a packaging bag, the arc-shaped convex portion toward the lower end of the cylindrical portion was formed by a solid line in which the cut was continuous with a width W50 mm of the weakened portion and a height H30 mm of the weakened portion.

Then, a straight line forming portion from both ends of the convex forming portions extending obliquely upward direction, is formed by the solid line obtained by continuous cuts. The straight line forming portion was formed so that the inclination angle θ with respect to the circumferential direction was 30 ° and was not hung on the back pasting portion of the packaging bag forming the length.

  Next, the both end portions of the laminated sheet are overlapped with the sealant layer on the inside, and sealed to form a back pasting portion to form a cylindrical portion, the lower end of this cylindrical portion is sealed to form a ground sealing portion, and then the upper end portion Peanuts were filled from the opening, the upper end was sealed to form a top seal portion, and a back-packed packaging bag filled with peanuts was created. In this case, there are a portion where the contents are occupied and a portion where the contents are not occupied, and a portion where the contents are not occupied is formed with a weakened portion and an anti-slip portion above the weakened portion. A back-wrapped packaging bag as shown was formed.

A back-packed packaging bag was formed in the same manner as in Example 1 except that the sliding angle was 15 degrees.

A back-packed packaging bag was formed in the same manner as in Example 1 except that the sliding angle was 16 degrees.

  A back-packed packaging bag was formed in the same manner as in Example 1 except that the sliding angle was 18 degrees.

  A back-packed packaging bag was formed in the same manner as in Example 1 except that the sliding angle was 20 degrees.

  A back-packed packaging bag was formed in the same manner as in Example 1 except that the sliding angle was 16 degrees, the inclination angle θ was 15 °, the width W50 mm of the weakened portion, and the height H30 mm of the weakened portion.

  A back-packed packaging bag was formed in the same manner as in Example 6 except that the inclination angle θ was 20 °.

  A back-packed packaging bag was formed in the same manner as in Example 6 except that the inclination angle θ was 25 °.

  A back-packed packaging bag was formed in the same manner as in Example 6 except that the inclination angle θ was 30 °.

  A back-packed packaging bag was formed in the same manner as in Example 6 except that the inclination angle θ was set to 35 °.

  A back-packed packaging bag was formed in the same manner as in Example 6 except that the inclination angle θ was 40 °.

  A back-packed packaging bag was formed in the same manner as in Example 6 except that the inclination angle θ was 45 °.

  A back-packed packaging bag was formed in the same manner as in Example 1 except that the sliding angle was 16 degrees, the inclination angle θ was 30 °, the weakened portion width W was 20 mm, and the weakened portion height H was 30 mm.

  A back-packed packaging bag was formed in the same manner as in Example 13 except that the weakened portion had a width W of 30 mm.

  A back-packed packaging bag was formed in the same manner as in Example 13 except that the weakened portion had a width W of 40 mm.

  A back-packed packaging bag was formed in the same manner as in Example 13 except that the weakened portion had a width W of 50 mm.

  A back-packed packaging bag was formed in the same manner as in Example 13 except that the weakened portion had a width W of 60 mm.

  A back-packed packaging bag was formed in the same manner as in Example 13 except that the weakened portion had a width W of 70 mm.

  A back-packed packaging bag was formed in the same manner as in Example 13 except that the weakened portion had a width W of 80 mm.

  A back-packed packaging bag was formed in the same manner as in Example 1 except that the sliding angle was 16 degrees, the inclination angle θ was 30 °, the weakened portion width W was 50 mm, and the weakened portion height H was 10 mm.

A back-packed packaging bag was formed in the same manner as in Example 20 except that the weakened portion had a height H of 20 mm.

  A back-packed packaging bag was formed in the same manner as in Example 20 except that the weakened portion had a height H of 30 mm.

  A back-packed packaging bag was formed in the same manner as in Example 20 except that the weakened portion had a height H of 40 mm.

  Below, the comparative example of this invention is demonstrated.

<Comparative Example 1>
A back-packed packaging bag was prepared in the same manner as in Example 1 except that the sliding angle was 12 degrees.

<Comparative example 2>
A back-packed packaging bag was prepared in the same manner as in Example 6 except that the inclination angle θ was 10 °.

<Comparative Example 3>
A back-packed packaging bag was prepared in the same manner as in Example 6 except that the inclination angle θ was 50 °.

<Comparative Example 4>
A back-packed packaging bag was produced in the same manner as in Example 6 except that the inclination angle θ was 55 °.

<Comparative Example 5>
A back-packed packaging bag was formed in the same manner as in Example 13 except that the weakened portion had a width W of 10 mm.

<Comparative Example 6>
A back-packed packaging bag was formed in the same manner as in Example 13 except that the weakened portion had a width W of 90 mm.

<Comparative Example 7>
A back-packed packaging bag was formed in the same manner as in Example 20 except that the height H of the weakened portion was 5 mm.

<Comparative Example 8>
A back-packed packaging bag was formed in the same manner as in Example 20 except that the height H of the weakened portion was 50 mm.

<Comparative Example 9>
A back-packed packaging bag was formed in the same manner as in Example 20 except that the height H of the weakened portion was changed to 60 mm.

<Evaluation method>
The anti-slip part of the back-wrapped packaging bag of Examples 1 to 23 and Comparative Examples 1 to 9 is crimped with the belly of the thumb, the back side (surface with the back-pasted part) of the packaging bag is sandwiched between the index finger, middle finger, and ring finger, The fingers were snapped upward and the other fingers downward, and the unsealing property was evaluated. The evaluation of openability is as follows: ○ is good and Δ is slightly bad.

<Evaluation results>
Table 5 shows.

実施例１〜２３の背貼り包装袋は、開封が容易にできた。しかし、比較例１〜９の背貼り包装袋は、親指の腹と基材フィルム層表面との間で滑り、フィンガースナップがし難く、開封がし難かった。

The back-sticking packaging bags of Examples 1 to 23 were easily opened. However, the back-sticking packaging bags of Comparative Examples 1 to 9 slipped between the thumb belly and the surface of the base film layer, were difficult to finger-snap, and were difficult to open.

  The back-attached packaging bag of the present invention is a packaging bag that can be easily opened even with one hand and has excellent portability. Moreover, it has the convenience that an opening piece does not become garbage.

1 Back Paste Packaging Bag of the Present Invention 2 End (Back Paste Forming Part)
3 Upper end 4 Lower end 5 Back sticking part 6 Top seal part 7 Ground seal part 8 Tube part 10 Weaker part 11 Convex part 12 Straight line part 13 Scar part 14 Concavity and convexity part 20 Antiskid part 30 Opening part 31 Opening piece 40 Contents are occupied Part 41 Content not occupied 50 Laminated sheet 51 Base film layer 52 Adhesive layer 53 Sealant layer 54 Intermediate layer 60 Hand 61 Thumb 70 Easy-open line 80 Conventional back-stick packaging bag 81 Conventional back-stick State after opening the packaging bag A Shear force

Claims (3)

At least the inner surfaces of both end edges of the laminated sheet composed of the base film layer / adhesive layer / sealant layer are sealed to form a back pasting portion to form a cylinder, and the inner surfaces of the end edges orthogonal to the back pasting portion are sealed to each other In the back-packed packaging bag in which the top and bottom seal part is formed and the cylinder part for storing the solid content is formed,
A weakened portion is formed on the portion of the tubular portion that is not occupied by the contents, except for the back pasting portion along the circumferential direction of the tubular portion,
An anti-slip part is formed on the surface of the base film layer around the weakened part ,
The weakened portion is formed from a convex shape portion formed toward the lower end direction of the cylindrical portion, and a straight line formation portion or a curve formation portion extending obliquely upward from both ends of the convex shape portion,
The anti-slip part is formed on the surface of the base film layer on the convex part side of the straight line connecting the ends of the weakened part at a position separated from the top and bottom seal part. Backpacking packaging bag. The position corresponding to the weakened portion of the sealant layer, according to claim 1 Symbol placement back lined packaging bag wherein the scar portion is formed. The position relative to the anti-skid parts of the sealant layer, back lined packaging bag according to claim 1 or 2, characterized in that the uneven portion is formed.

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