WO2004035415A1

WO2004035415A1 - Easily openable packaging bag

Info

Publication number: WO2004035415A1
Application number: PCT/JP2003/013244
Authority: WO
Inventors: Tatsumi Moriyoshi; Tadayuki Koyanagi; Tooru Sasaki; Tomonari Shinohara; Tetsuo Matsushita
Original assignee: Kabushiki Kaisha Hosokawa Yoko
Priority date: 2002-10-16
Filing date: 2003-10-16
Publication date: 2004-04-29
Also published as: AU2003301418A1; EP1595816A4; EP1595816A1

Abstract

Provided are an easily openable packaging bag having excellent sealing ability, capable of being heated by boiling etc., and being easily openable by pulling a tape-like opening piece, sandwiched in a face-butt seal, so as to cut off the bag in a ring shape, and an easily openable packaging bag where the content received in the bag can be taken out by easily opening with a light force a box-shaped plastic film-covering body along the entire periphery of the body. An easily openable packaging bag is characterized as follows. To form the bag, a plastic film (3) is folded, each of both end portions of the film are laid over each other, and thermally fuse-bonded to form a face-butt seal portion (1) of a tubular shape, and both opening ends are thermally fuse-bonded. The bag comprises a tape-like opening piece (2) sandwiched at any one or more portions of the face-butt seal portion, with the tip being projected, and integrally fuse-bonded; easily tearable treatment (5) applied to the outer end edge portion of the face-butt seal portion where both ends in a width direction of the tape-like opening piece is sandwiched; and easily cuttable treatment (6) applied to non fusion-bonded portion nearer to the bag interior side than the face-butt seal portion inner edge end of a film (3-2) on the valley fold side of the face-butt seal located on a line extended in a length direction of the tape-like opening seal folded to a periphery direction of the tube.

Description

Easy-to-open packaging bag technology

The present invention relates to a packaging bag for a pillow eve with a tape-shaped opening piece, which is capable of heat treatment of a boil or the like and has a sealing property capable of opening the bag in a circumferential shape. The present invention relates to a bag and an easily-opening packaging bag that allows the contained contents to be easily taken out by opening the plastic film outer package along the entire circumference. Background technology

First, the background art relating to the first invention of the present application will be described.

When removing the contents contained in a bag made of plastic film, open it with scissors, a kitchen knife, a knife, or the like, or use the seal end or bend of the bag to open it without using these tools. It was common practice to apply notches, fine scratches, or rough surfaces to the part and then tear open the bag starting from it, or peel off the seal part as a weak seal for the bag and open it.

As a bag that can be opened by tearing the bag, in the case of a three- or four-side sealed bag, a bag provided with fine scars over the entire length of the seal edge of the bag is known (for example, see Patent Literature). 1). Also, in the case of a single pillow bag, it is known that the folded portion of the bag formed by folding the film into two is roughened (for example, see Patent Document 2). The film is torn simultaneously in the same direction and opened.

In these methods, if there is no content on the extension line of the tearing of the bag, the contents can be torn and removed without any problem. However, when the contents are wrapped in tights, such as yokan, tofu, jelly, etc., or when the contents are wrapped to the full length of a bag, such as in the case of medical equipment such as a hot dock or a syringe. However, it was difficult to open the bag by tearing the bag because the contents were on the extension of the tear, which was an obstacle. If the bag was forcibly opened, the contents could be deformed or deteriorated. As a method for opening a package containing the contents packed in the evening or in a bag as a whole, only the film located on the front side of the gasket seal part folded in the circumferential direction of the bag should be in the direction perpendicular to the seal edge. By wrapping the bag around and tearing it into a band, the bag is cut into three pieces, a band-shaped opening piece 12 shown in Fig. 9 and the bag body 11 on both sides, and opened in a ring shape. There is a way to do that. The technical point for opening only the front side film of the gas seal seal in a strip shape is, first, the film located on the back side of the front and back film that is fused and integrated at the gas seal seal part with the front side film and the seal inner edge. The second is a method to separate only the front side film and tear it, and the second is a method of tearing only the front side film around the bag in the direction perpendicular to the edge of the joint seal.

As a method of separating the front and back films of the joint seal of the first technology point at the inner edge of the joint seal and tearing only the film on the front side, as shown in the cross-sectional view of the joint seal part 1 with the opening piece 2 shown in Fig. 1, The front side film of the gasket seal part 1 (the outer film that turns to the mountain fold side when the gasket seal part is tilted in the circumferential direction of the bag) 3-1 and the back film (valley fold when the gasket seal part is tilted in the circumferential direction of the bag) The tape-like opening piece 2 is sandwiched between the two superposed films of 3-2, with the tip of the opening piece protruding from the outer edge 1--1 side of the joint seal portion 1. Notch 4-1 as shown in the plan view of the portion where the unsealing piece is placed in Fig. And the method of starting the tearing at two places (4-2) Reference 3), and a method of placing an opening piece similar to the above and applying a fine scar 5 along the entire length of the outer edge 1-1 of the seal as shown in Fig. 2-B instead of a notch as a means to start tearing Has been proposed (see Patent Document 4).

The principle of tearing only the front side film 3-1 by the above method is that the adhesive strength between the opening piece 2 and the back side film 3_2 is weakened, that is, by controlling the easy peeling property as shown in FIG. When pinch 2 is picked up and pulled up in the direction of the arrow a, the adhesive between the unsealing piece 2 and the back side film 3-2 is peeled off, and in the case of Fig. 2A, the front side film with the distance width between the notches 4-1 and 4-2. Only 3-1 is torn in the direction of arrows b-1 and b-2 in Fig. 4. Similarly, in the case of FIG. 2B, although not shown, only the front side film of the width of the opening piece 2 is shown in FIG. 4 from the fine scratches at the portion in contact with both ends in the width direction of the opening piece 2. It tears as well.

However, in these cases, since the adhesive strength between the opening piece 2 and the back film 3-2 was controlled to be weak so as to make it easy to peel off, there was a problem in the sealing property of this portion. In particular, the use of a heating bag such as a boil for the purpose of the present invention was limited due to a problem in the sealing property.

As another method of separating the front and back films at the inner edge of the gasket seal and tearing only the film on the front side, as shown in the plan view of the gasket seal part 1 in Fig. The notch 7-1 and 7-2 are provided with easy tearing (easy tearing) parts on the outer edge 111, and the notches 7-1 and 7-2 are connected between the notches 7-1 and 7-2, as shown in the sectional view of the seal in Fig. 5. A bag is proposed in which an easy-cut processing section 6 is provided on the non-seal part of the seal inner edge 1-2, which is on the extension line of the tear when the pinch is torn in the direction perpendicular to the seal edge, and the non-seal part of the backside film 3, near the inner side of the seal inner edge (See Patent Documents 5 and 6).

In this case, open the front film 3-1 and the back film 3-2 simultaneously by pinching the seal end between the notches 7-1 and 7-2 and pulling in the direction of arrow c in FIG. When the inner edge of the seal reaches the vicinity of 1 to 2, only the back side film 3-2 is cut by the easy-cutting processing section 6 and only the front side film 3 to 1 of the notch 7-1 and 7-2 has the gap width shown by the arrow d in FIG. It tears in a strip in the directions of — 1 and d— 2.

In this case, the front side film 3-1 and the back side film 3-2 of the gasket seal part 1 are bonded at a normal strength level, so there is no problem with the bag sealing performance, but notches 7-1 and 7- No. 2 is processed at the outer edge of the seal 1 1 1 1 end, so it is difficult to distinguish it, and the notch cut is not too deep to secure the sealability, so the knob margin is shallow and it is difficult to pick with your fingertips There were drawbacks. In addition, there was a disadvantage that the notch was caught in the distribution stage of the package and unintended bag breakage was likely to occur.

There has been proposed a bag in which a U-shaped cut is formed inside the seal portion instead of the notch and an easy-peeling portion is provided in a region including the cut (see Patent Document 7). . And there was a defect that the easy tearing treatment of these notches and the like was hardly noticeable and hard to pick.

As a method for returning to the original opening position after tearing only the front side film 3-1 at the second technical point into a strip shape as shown in Fig. 9, open the packaging bag. A method has been proposed in which a narrow tape tape for sealing is arranged, and the tape tape protruding from the seal end is picked up and pulled to circumferentially open along the tear tape (see Patent Document 8).

In this case, it is not necessary to use a special type of film, but special equipment is required to wrap the tear tape around the bag and adhere it to the film, and a tear tape of the same length as the circumference of the bag is required, which results in cost. There was a drawback that the bag became high, and a problem occurred in the sealability of the bag because the front and back films were separated at the inner edge of the seal due to peeling upon opening.

As a method that does not rely on tear tape, the bag is opened circumferentially by using a straight cut film that can be torn in the direction perpendicular to the edge of the palm joint as the film constituting the bag as a film material. A method has been proposed (see Patent Documents 5 and 6). With this method, there is a limitation that a straight-cut film must be used, but as long as opening is started by the method described above, the bag can be opened from any part of the joint seal part by opening the bag. There is convenience.

Next, background art relating to the second invention of the present application will be described.

The chewing gum is commercially available in which a pair of notches are provided at the edge of the butt end, and the butt end is housed inside a box-shaped plastic film exterior body bent toward the main body.

To remove the chewing gum from the box-shaped plastic film casing, raise the butted end from the box-shaped plastic film casing and hold the pair of notches at the butted ends to pull the notches to the butted ends. Is formed by forming a pulling piece with the opening as a starting point, and by further pulling the pulling piece, the box-shaped plastic film outer package is opened along the entire circumference with the width of the pulling piece. In order to open the box-shaped plastic film outer package linearly along the entire circumference, the chewing gum package is made of a uniaxially stretched plastic film which is a directional plastic film formed of a plastic film forming the box-shaped plastic film package. It has a configuration that includes lum.

However, when the box-shaped plastic film exterior body is formed of a plastic film obtained by laminating a uniaxially stretched plastic film, the box-shaped plastic film If the film package is formed of a plastic film obtained by laminating a biaxially stretched plastic film, it will be more expensive, and there is a limit to the cost reduction of the product.

A box-shaped plastic film exterior body formed by bending the end seal portion and the butt end seal portion toward the main body side, and a content accommodated inside the box-shaped plastic film exterior body, A pair of notches is provided at the butt end seal of the plastic film exterior body, and a tear tape is attached to the inner surface of the box-shaped plastic film exterior that extends from the middle of the end seal part in the circumferential direction so as not to reach the end seal part. The arranged package is known (for example, Patent Document 9).

The package in which the tearing tape is arranged on the box-shaped plastic film outer casing has a bow [The tear-off tape can be used as a guide to open the box-shaped plastic film packaging linearly along the entire circumference. Can be formed by laminating a biaxially stretched plastic film, which can reduce the cost of the product.However, since the tear tape is located at the butt end seal, the thickness step is heated. In addition to hindering stability during sealing, a considerable force is required to break the body side following the butt-end seal part of the box-shaped plastic film exterior body. Therefore, the plastic film that can be used for the box-shaped plastic film exterior body is limited to a plastic film that is easily broken.

Patent Document 1 JP-A-6-89966

Patent Document 2 Japanese Utility Model Publication No. 6 3-1 4 7 4 5 1

Patent Document 3 Japanese Patent Laid-Open No. 63-67272

Patent Document 4 JP-A-63-67272

Patent Document 5 Japanese Patent Application Laid-Open No. H11-499185

Patent Document 6 Japanese Patent Application Publication No.

Patent Document 7 Japanese Patent Application Laid-Open No. 2001-5808649

Patent Document 8 Japanese Patent Application Laid-Open No. 2000-014-2 726

Patent Document 9 JP-A-8-9-1430 Disclosure of the invention

The first invention of the present application is a pillow-type wrapping bag suitable for packaging tight contents with a tape-shaped opening piece. The wrapping bag has excellent sealing properties and can be heat-treated with a boiler or the like, and is circumferentially opened. The present invention provides an easily-openable packaging bag that can be used.

Further, the second invention of the present application provides an easy-opening packaging bag that enables the box-shaped plastic film outer package to be easily opened along the entire circumference with a weak force to take out the stored contents. Is what you do.

In the easy-open packaging bag according to the first invention of the present application, the plastic film is bent, the both ends are overlapped and heat-sealed to form a joint seal portion, and the both open ends are heat-sealed after being formed into a cylindrical shape. In the easy-open packaging bag, a tape-shaped opening piece that is inserted and fused integrally with one or more portions of the gasket seal portion with its tip protruding, and both sides in the width direction of the tape-shaped opening piece An easy tearing process applied to the outer edge of the gasket seal portion sandwiching an end, and the gasket seal positioned on an extension of a lengthwise direction of the tape-shaped opening piece bent in the circumferential direction of the cylinder. And an easy cutting process applied to the non-fused portion of the film on the valley-fold side from the inner edge of the joint palm seal portion to the non-fused portion on the inner side of the bag.

In addition, the bag is a gusset-shaped bag having a folded portion at both ends of the bag.

It is characterized by the following.

Also, the other end of the tape-shaped sealing piece is located 2 to 8 mm inside the seal from the inner edge of the gasket seal and is sandwiched by the gasket seal portion.

Further, the plastic film is laminated in the order of a base film, an intermediate film, and a heat-fusible file.

Further, the intermediate film is a film having tearability in a direction perpendicular to a length direction of the joint seal.

Further, an easy-cutting process comprising a group of fine scratches penetrating both the base film and the intermediate film laminated in advance is provided.

Further, the plastic film is characterized by being laminated in the order of a base material film, a noble film, an intermediate film, and a heat-fusible film. W

7 Further, the invention is characterized in that the barrier film is made of aluminum foil. Further, an easy-cutting process comprising a group of fine scratches penetrating all of the base film, the barrier film, and the intermediate film, which are laminated in advance, is performed.

Further, the easy cutting process is a group of fine scratches formed by pressing a jig forming a group of fine scratches penetrating the film onto the film.

Further, the fine scar group is a fine scar group formed by pressing abrasive grains against a film.

Further, the microscopic scar group is characterized by a microscopic scar group formed by a notch formed by pressing a blade against a film and parallel to an inner edge of the joint seal.

Further, the easy-cutting processing is performed only at a position including an extension of the tape-shaped opening piece with a width of 1.5 to 4 times the width of the tape-shaped opening piece.

Further, the easy cutting process is performed at least over a non-fused portion in a range of 1 to 10 mm from the fused portion and an inner edge of the fused portion.

Further, the easy tearing process continuously applies a large number of fine and elongated scars in a direction substantially perpendicular to an edge line of the outer edge of the palm joint seal in the longitudinal direction of the joint palm seal part. It is characterized by having been done.

Further, at least a portion where the tape-shaped unsealing piece is located at a position where the tape-shaped unsealing piece is located is overlapped with a film overlapping portion of the gasket seal portion over the entire width.

In addition, the base film is a film that can be sealed on one side, or the joint seal portion is fused to the bag body by part coating.

The easy-open packaging bag according to the second invention of the present application includes: a box-shaped plastic film outer body formed by bending both end seal portions and a butt end seal portion toward the main body; and the butting of the box-shaped plastic film outer body. The protrusions correspond to a pair of notches provided in an end seal portion and a cut piece forming area defined by a virtual parallel line connected to the pair of notches on the inner surface of the main body of the box-shaped plastic film. A tear tape extending circumferentially from a position near the base end of one end of the mating end seal portion to a position close to the base end of the other end, and a tear tape disposed on the box-shaped plastic film exterior body. An easy-opening portion extending from the valley-side bent portion of the butt end seal portion to the surface layer of the main body portion so as to extend across the cut piece forming area.

Further, the easy opening portion is a perforation.

Further, the easy-to-open portion has a rough surface with a narrow width.

Further, the width of the tear tape is smaller than the width of the cut piece forming area.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a cross-sectional view showing the vicinity of an opening piece of a conventional bag provided with a tape-like opening piece utilizing easy peelability.

Fig. 2 is a plan view showing the vicinity of an opening piece of a conventional bag with a tape-like opening piece that utilizes easy peeling property.Fig. 2A shows a case where only the front side film having a distance width between notches is torn in a strip shape. FIG. 2B is a diagram showing a film in which only the front film having the width of the opened piece is torn from a fine scar at a portion in contact with both ends in the width direction of the opened piece.

FIG. 3 is a state diagram of a conventional bag with a tape-shaped opening piece utilizing easy peelability at the start of opening.

FIG. 4 is a state diagram at the start of opening of a conventional bag with a tape-shaped opening piece utilizing easy peelability.

FIG. 5 is a cross-sectional view showing the vicinity of an opening notch of a conventional bag without an opening piece.

FIG. 6 is a plan view showing the vicinity of an opening notch of a conventional bag without an opening piece.

FIG. 7 is a state diagram at the start of opening of a conventional bag without an opening piece.

FIG. 8 is a state diagram at the start of opening of a conventional bag without an opening piece.

FIG. 9 is an opened state diagram of the bag of the related art and the present invention.

FIG. 10 is a cross-sectional view of the plastic film constituting the bag of the present invention. FIG. 11 is a cross-sectional view of the tape-like opening piece insertion portion of the easily-opening packaging bag of the present invention. FIG. 12 is a plan view of the tape-like opening piece insertion portion of the easily-opening packaging bag of the present invention. FIG. 13 is a sectional view of the easy-open packaging bag of the present invention at the start of opening, and FIG. A is the first stage at the start of opening, and FIG. 13B is the second stage at the start of opening. FIG. 14 is a plan view of the easy-open packaging bag of the present invention at the start of opening.

FIG. 15 is a perspective view of the easily-openable packaging bag of the present invention.

FIG. 16 is an enlarged sectional view of the easily-openable packaging bag of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

First, an embodiment of the first invention of the present application will be described with reference to FIG. 9 to FIG.

The packaging bag of the present invention is obtained by bending a plastic film, overlapping both ends in a palm-shape manner, heat sealing the overlapped portion to seal vertically, and then horizontally sealing the free end. At this time, the tape-shaped unsealing piece is sandwiched between the apod films before heat fusion with the tip protruding from the outer edge of the apron part, and then integrally fused.

The easily openable packaging bag of the present invention will be described with reference to the drawings.

FIG. 10 is a cross-sectional view of the plastic film 3 of the present invention. The plastic film 3 is composed of a laminated film in which at least a base film 8, an intermediate film 9, and a heat-fusible film 10 are laminated in this order. Examples of the base film 8 include polyolefin resin films such as polypropylene, polyamide resin films such as nylon 6, nylon 66, and nylon 12, and polyester resin films such as polyethylene terephthalate and polybutylene terephthalate. For example, a stretched film is used.

The intermediate film 9 is a film having a linear cut property and is laminated to give the plastic film 3 a linear cut property. Examples include uniaxially stretched polyethylene film, uniaxially stretched polypropylene film, and other uniaxially or uniaxially stretched polyolefin films and nylon 6 resin mixed with polymethaxylylene adipamide resin to improve the layer separation structure and stretching conditions. And a biaxially stretched polyester-based film obtained by mixing a polyethylene terephthalate resin with a polyethylene terephthalate resin and devising a layer separation structure and stretching conditions. As another method for providing the plastic film 3 with the linear cut property without using the intermediate film 9 having the linear cut property, two base films are divided into two parts. W

The layers may be stacked so that the element orientations intersect.

Examples of the heat-fusible film 10 include low-density polyethylene, linear low-density polyethylene, a copolymer resin of ethylene and a vinyl compound copolymerizable with ethylene, or a polypropylene resin film.

When water vapor barrier properties, oxygen barrier properties, and aroma barrier properties are required, base film 8 is coated with a barrier resin layer mainly composed of polyvinylidene chloride resin or ethylene vinyl alcohol resin, or base film. 8 using a film on which metal oxide, metal, etc. are deposited, or another film having gas barrier properties (not shown), such as metal foil such as aluminum, polyvinylidene chloride resin film, ethylene vinyl alcohol resin film, or the like. A film such as a co-extruded film of these and another resin can be laminated between the base film 8 and the intermediate film 9 or between the intermediate film 9 and the heat-fusible film 10. Due to the ease of tearing at the time, the barrier film is made of the base film 8 and the intermediate film 9 Better to laminated is preferable.

The method for producing the plastic film 3 is not particularly limited. The film is obtained by extruding molten polyethylene from a dry lamination method, a lamination method, and a T-die in which films are laminated with an adhesive. The purpose is a sandwich lamination method in which the layers are laminated together, an extrusion lamination method in which polyethylene is laminated by extruding molten polyethylene from a T-die, and a thermal lamination method using a heat-fusible resin with a low melting point. It is used according to.

FIG. 11 is a cross-sectional view of a portion in which a tape-shaped opening piece 2 is sandwiched and heat-sealed in a circumferentially bent seal portion 1 of the easily-openable packaging bag of the present invention, and FIG. FIG. The outer edge 1-1 of the front film 3-1 and the back film 3-2 of the gasket seal part 1 has been subjected to easy tear processing 5, and the opening piece 2 protrudes the tip from the seal outer edge 1-1. The other end is sandwiched between the joint portions of the front film 3-1 and the back film 2-2 in a state of being located inside the seal inner edges 112, and is integrally fused and joined.

"To be fused and joined together" means that the gasket seal portion 1 where the opening piece 2 is located is fusion-sealed over the entire width without leaving non-fusion at the outer edge of the gasket portion. Means that In other words, when the opening piece 2 is picked up with a finger and lifted to be opened, if the outer edge 111 of the joint portion is not fused but remains as a non-fused portion, it is easily torn through the opening piece 2. This is because it is difficult for shearing force to be applied to the 5th processing part, and it is easy to start tearing.

The backside film 3-2 located on the valley fold side of the gasket seal part 1 bent in the circumferential direction of the cylinder is subjected to easy cutting processing 6 and the non-fused part on the inner side of the bag from the inner edge 1-12 of the gasket seal part It has been applied to. The back side film 3-2 of the gasket seal part 1 that is bent in the circumferential direction of the bag has a tape-shaped opening piece 2 when the bag is opened when the folded part is lightly fixed to the body of the bag. Easy tearing process when picking out and cutting.5 Easy to apply shearing force and easy to cut out.After boiling the package in liquid, water does not collect in the gap between the folded part of the seal and the bag, and water is removed. It is preferable because it can be easily removed. For this purpose, the heat-sealing surface layer of the gasket seal part 1 and the body part of the bag that overlaps the heat-sealing part are folded using a heat-sealed film as the base film 8 of the plastic film 3. The sealable surface layer and are heat-sealed during bag making.

The shape of the bag having the gasket seal portion 1 may be either a pillow flat bag in which both ends of the bag are mountain-folded or a gusset shape having a fold including a mountain-fold portion and a valley-fold portion at both ends of the bag. When filling semi-solid contents or solid contents such as yokan, gusset-shaped bags are more efficient for storing the contents and can be molded into a rectangular parallelepiped with good appearance. This is preferred.

The tape-shaped enclosing piece 2 is a small tape-shaped small piece, and is sandwiched between the front-side film 3-1 and the back-side film 2-2 of the joint portion to be integrally fused and joined. For this purpose, it is necessary that the front and back of the opening piece 2 have a heat-sealing property with the heat-fusible film 10 laminated on the plastic film 3, and the enclosing piece 2 may be a single-layer film. However, it is preferable that the film is not easily stretched by the tension pulling the unsealing piece 2 at the time of unsealing. Usually, the number of the opening pieces 2 is one if the position is appropriate, but in some cases, two or more pieces may be provided. As an example of the laminated film of the opening piece 2, the same kind of heat-fusible film 10 on both sides of a stretched film of polypropylene, nylon, polyester, etc. And the like are used. The stretched film may be printed to make the position of the opening piece 2 easily visible at the time of opening. The width of the opening piece 2 may be any width as long as it is easy to pick with a finger, and generally a size of about 3 to 10 mm is used.

The length is determined by the length protruding from the outer edge of the seal, the width of the seal and the distance between the inner end of the opening piece and the inner edge of the seal. The protruding length from the end 11 may be any length as long as the tape-shaped opening piece 2 can be easily picked, and is preferably about 5 to 15 mm. The distance at which the other end of the opening piece 2 is located inside the seal from the inner edge 112 of the gasket seal part 1 is important because it affects the sealing performance of the bag.

That is, the portion of the gasket seal portion 1 where the opening piece 2 is sandwiched is thicker than the other portion that is not sandwiched by the thickness of the opening piece 2 and corresponds to the thickness of the opening piece 2 at the boundary. Step occurs. When the sealing pieces 2 sandwiched between the joints are heat-sealed together to seal the joints, it is difficult to apply sealing pressure to the steps, and if the steps are too large, the space created by the steps is melted by heat. It is difficult to stably and completely fill with the adhesive resin 10, and therefore, poor sealing is likely to occur.

Even if a seal failure occurs due to this, in order to cover this and prevent a seal failure, the inside of the opening piece 2 (the end on the side sandwiched by the joint seal portion) It is preferable to be located inside the inner edge 1 of 1. That is, since the inner end of the opening piece 2 is positioned in this manner, the opening piece 2 does not exist between the inner end of the opening piece 2 and the inner edge 1-2 end of the gasket seal portion 1 on the extension line. There is no step, and the front film 3-1 and the back film 2-2 are directly sealed without passing through the opening piece 2, so that the sealing property is maintained at this part. Specifically, it is preferable that the inner tip of the opening piece 2 is located 2 to 8 mm inside (X in FIG. 12) from the inner edge 1-2 of the joint seal portion 1. Therefore, for example, if the protruding length of the opening piece 2 is 10 mm, the width of the joint seal 1 is 15 mm, and the distance located inside is 4 mm, the length of the tape-shaped opening piece 2 is 21 mm. .

The easily tearable processing 5, which is the starting point of the opening of the seal, is performed on the outer part 1-1 of the seal across the both ends in the width direction of the opening piece 2 or on the vicinity thereof. Easy tear processing 5 methods and Then, two or more notches such as I-notches and V-notches are provided at or near the outer end of the seal in contact with both ends in the width direction of the opening piece 2 at the time of bag making, or at the time of bag making. A plastic film 3 in front of the bag is used as a jig or fine tool in which a large number of blades having fine projections are provided on the circumferential surface of a rotating roll as described in Japanese Patent Application Laid-Open No. 6-141432. By pressing a plastic film 3 with a jig provided on the circumferential surface of a rotating roll with fine abrasive grains, fine scratches 5 are continuously formed along the entire length of the outer edge 11 of the seal as shown in Fig. 12. May be provided.

When making the former cut, it is necessary to make the bag with care so that the two cuts are located exactly on both sides of the opening piece 2 or in the vicinity thereof, but the latter seal outer edge 1 1 1 The method of continuously applying fine scratches along the entire length is a preferable method because it is not necessary to pay special attention to the positional relationship between the unsealing piece 2 and the easily tearable processing 5.

FIGS. 13A and 13B show the opening piece 2 at the beginning of opening, and FIG. 14 is a plan view thereof. The opening of the easily-openable packaging bag of the present invention is started by picking the opening piece 2 and pulling it in the arrow direction e as shown in FIG. 13A. Since the opening piece 2 is fused together with the front and back films 3 _ 1 and 3-2, the joint seal 1 into which the sealing piece 2 is inserted is pulled in the width direction of the opening piece 2 when the opening piece 2 is pulled. Starting from the fine scratches formed on the outer edges 1-1 of the seals on both sides or in the vicinity of the seal edges 1-1, tearing is started in the direction of the arrows f-1 and f-2 in Fig. 14. When the tearing of the gasket seal part 1 progresses and reaches the seal inner edge 1-2, a tensile stress acts on the back side film 3-2. The back film 3-2 near the inner edge 1-2 of the gasket seal part 1 is subjected to easy cutting processing 6, which reduces the strength of this part and makes it easier to cut. When the film strength exceeds the film strength, the backside film 3-2 is cut off and separated at the easy-cut processing part 6 of the non-seal part inside the bag beyond the seal inner edge 1-2 as shown in Fig. 13B. Only the front side film 3-1 continues tearing and continues around the bag to return to the tearing start position. Finally, as shown in Fig. 9, the strip-shaped tearing piece 1 2 and the bag body on both sides 1 1 1 1 and 1 Divided into three pieces of 1—2 and opened in a ring. In FIGS. 13 and 14, the easy-cutting processing 6 is performed over the seal portion of the joint palm seal portion 1 including the extension line in the length direction of the opening piece 2 and the non-seal portion inside the bag. you have to This is not necessary, and it is sufficient if at least the non-seal portion inside the bag near the inner edge of the seal 112 has a width of 1 to 10 mm (Z in FIG. 12).

The easy-cut processing 6 is continuous in the length direction of the seal inner edge 1 to 2 because the easy-cut processing is simple and high accuracy is not required for positioning when the unsealing piece 2 is inserted into the joint seal part 1. Although it may be provided, it is preferable from the viewpoint of the mechanical strength of the bag that the inner edge 1-2 be provided only on a necessary part in the length direction, as shown in Figs. 13 and 14. Considering the positional accuracy when inserting the opening piece 2 into the gasket seal part 1, the size is determined so that the extension in the length direction of the opening piece 2 always has 6 easy-cut processing parts. It should be 1.5 to 4 times the width of the unsealing piece (Y in Fig. 12), and should be provided in the length direction of the seal inner rim 1-2, depending on the insertion position accuracy of the unsealing piece 2. Is preferred.

By pulling the tape-like opening piece, the pulling method matches the method of sandwiching the tape, so that the effect of the easy cutting process can be exhibited. The processing method for easy cutting processing 6 is a jig in which a number of blades consisting of minute projections are provided on the circumferential surface of the rotating roll or a jig in which fine abrasive grains are provided on the circumferential surface of the rotating roll. A method of laminating the intermediate film 9 and the heat-fusible film 10 after pressing the base film 8 before lamination of 10 and forming a fine scar by pressing the base film 8 and the intermediate film 9 before lamination A method of laminating the base film 8 and the intermediate film 9 and the heat-fusible film 10 after pressing separately to give fine scars, or pressing the pre-laminated base film 8 and the intermediate film 9 There is a method of laminating the heat-fusible film 10 after applying fine scars to the same part of both films, and among them, the fine scar that penetrates the film is added to the third laminated film. Applying with the weakest force when opening Side film 3 - 2 is likely the preferred method to cut.

The method of applying the easy-cutting processing 6 partially to a predetermined location in the length direction of the inner edge of the gasket seal 1-2 is to print a registration mark on the base film in advance and detect the registration mark with a sensor. The controller sends a signal to the controller, and transmits the control signal from the controller to the controller all at once. This is achieved by adjusting the rotation of a rotary jig in which grains are partially provided at predetermined pitch intervals. The easily openable packaging bag for pillow overnight using the tape-shaped opening piece of the present invention is easy to recognize the opening location, easy to pick the opening piece, and has excellent sealing properties, so that heat treatment such as boiling can be performed. Since the bag can be opened circumferentially, it is particularly suitable for packaging contents such as konnyaku or konjac jelly which need to be filled with the contents and heated such as boiling.

Example

As base film, Teijin Dupont Film Co., Ltd., one side heat sealable biaxially stretched polyethylene terephthalate film with a thickness of 15 zm Melinex 850 and aluminum foil with a thickness of 7 zm and an intermediate film Three types of 17-meter-thick high-density polyethylene film made by Toyo Chemical Co., Ltd. with a linear force in the direction, Z force Larian Y are used in this order using a two-component polyurethane resin tree. And laminated.

Next, the three-layer laminated film was provided with a rectangular easy-cut processing portion having a width of 10 mm and a length of 20 mm with a pitch of 120 mm in the flow direction of the film. The easy-cutting process is performed by rotating a 10 mm thick rotating disk with a diameter of 76.4 mm ø. Using a processing jig fixed to a distance of mm, the above laminated film is pressed between a rotating processing jig and a metal receiving roller to give fine penetrating scars to the film. Made by.

To adjust the processing beach, register marks are printed on the base film Z polyethylene terephthalate film at a pitch of 120 mm in advance, the register marks are detected by the sensor, a signal is sent to the controller, and a control signal is sent from the controller. This was done by fine-tuning the rotation of the processing jig by transmitting it throughout the servomotor. Next, the low density of the intermediate film / force Larian Y film density than T die using a tandem extruder side 0. 9 1 7 cm ³ with a thickness 1 5 zm of the laminated film having been subjected to the easy-cutting treatment processing Polyethylene and linear low density polyethylene having a density of 0.920 g / cm ³ and a thickness of 20 zm were laminated in this order. Next, a slit film having a width of 129 mm was obtained from the laminated film such that the center having a width of 10 mm of the easily cut portion was located at a position of 15 mm from the edge of the film. At this time, the center of the slit line is pressed with a 5.5 mm thick metal rotating jig provided with a number of cutting tools consisting of minute projections on the circumferential surface of the metal roll, and fine scratches are continuously formed in the flow direction of the laminated film. By applying slits after applying the target film, a slit film was obtained in which both edges were continuously subjected to an easy tearing process using fine scratches.

Using a gusset-type bag making machine, this slit film is opened at one end in the longitudinal direction with a joint seal width of 15 mm, a folding depth of 8.5 mm at both ends, a horizontal seal width of 3 mm, and a skirt length of 4 mm. In addition, a gusset-shaped bag was obtained in which the gasket seal portion fell to the side of the easy-cutting processing side and was lightly joined to the bag body. At this time, a tape-shaped enclosing piece with a length of 17 mm and a width of 7 mm, in which a 25-m-thick low-density polyethylene is laminated on both sides of a 25-m-thick biaxially stretched polyethylene terephthalate film, is placed vertically. It was sandwiched and fused integrally with the joint seal part so as to be positioned at the center of the position where the 20 mm easy cutting process was performed, protruding 7 mm from the outer edge at right angles to the outer edge of the seal. The insertion position of the tape-shaped enclosing piece was adjusted by detecting the registration mark using the registration mark used for adjusting the position of the easy-cutting processing, and transmitting the signal.

The tip of the tape-like opening piece on the side sandwiched by the joint seal of this bag is located 5 mm inside the seal from the inner edge of the seal, and 5 mm of the 10 mm wide easy-to-cut part is the joint seal part, 5 mm is located across the unsealed part inside the bag. A gusset bag with a tape-like opening piece, 500 pieces of which is opened at one end, is filled with konjac jelly, the open end is sealed, and the filling material is set on a retainer at 85 ° C. For 30 minutes in hot water. No broken bags were observed during the hot water treatment, and the 500 packed bags after the treatment were dried, and immediately after and one week later, the state of the bags was observed. Did not.

When the tape-like opening piece protruding from the joint seal is picked up with a finger and pulled in a direction perpendicular to the seal to pull it up, the films on the front and back of the joint with a band width of approximately 7 mm have both sides of the opening piece. When the tear reaches the inner edge of the jointed palm seal part, the resistance increases once and the back side film on the folded side of the jointed palm joint part is cut by the easy-cut processing part. Only the remaining cut-side front film could be torn in a ring around the bag. Opened bag with 帯 mm band width It was divided into three pieces, a tear piece and bag pieces on both sides, and the konjac jelly of the contents could be easily taken out without breaking.

The easily openable packaging bag of Pyro overnight Eve of the present invention has a good sealing property and a heat treatment such as a boil, since the tape-shaped opening piece is sandwiched with the tip protruding into the joint seal portion and fused together. It is possible. In addition, the opening position is easy to visually recognize at the time of opening, and can be opened by tearing the opening piece and pulling it in a ring shape by pulling and pulling the opening piece, which is particularly useful as a packaging bag in which the contents are completely filled.

Next, an embodiment of the second invention of the present application will be described with reference to FIG. 15 to FIG.

FIG. 15 is a diagram showing an example in which the easily-openable packaging bag according to the second invention of the present application is applied to a chewing gum package. The chewing gum package 101 has a box-shaped plastic film casing 102 and a chewing gum (not shown) which is a content contained in the box-shaped plastic film casing 102. .

The contents contained in the box-shaped plastic film casing 102 are not limited to chewing gum as long as the contents are contained in the box-shaped plastic film casing 102.

The box-shaped plastic film exterior body 102 is formed by sealing a rectangular plastic laminated packaging material at both ends by sealing both ends to form a cylindrical body having a butt end sealing portion 103, and sealing both ends of the cylindrical body. The end seal portion 104 is formed by bending the end seal portion 310 and the end seal portions 104 and 104 toward the main body. Each end seal portion 104 is formed by folding and heat-sealing the four sides 104 a, 104 b, 104 c, and 104 d inside each other. A rectangular seal piece 105 is adhered to the end seal portion 104 of the box-shaped plastic film exterior body 102 so as to cover the end seal portion 104.

As shown in FIG. 15, the box-shaped plastic film outer casing 102 has a butt end seal section 103 at one end close to one end seal section 104 in the longitudinal direction at 5 mn! It has a pair of notches 106, 106 spaced apart by ~ 15mm. The butted end seal portion 103 is formed by cutting along a virtual line 107, 107 connected to the notches 106, 106 starting from a pair of notches 106, 106. Pull piece 1 0 8 To form

The imaginary lines 107 connected to the notches 106 of the box-shaped plastic film outer casing 102 are parallel to each other, butted from the end seal portion 103 through the main body 109, and the end seal portion 103 Extending to The imaginary lines 107 and 107 extending to the main body 109 form a cut-piece forming area 110 extending in the circumferential direction of the box-shaped plastic film exterior body 102.

On the inner surface of the main body 109 of the box-shaped plastic film outer casing 2, one end of the butt end seal portion 103 is provided as shown in FIG. 16 corresponding to the cut piece forming area 110. From the position close to the base end of the part 103 a to the position close to the base end of the other end 103 b, the tear tape extends so as to extend in the circumferential direction without touching the end seal part 103. 1 is glued. The tear tape 111 has a thickness of about 40 microns and a width of 5 to 15 mm, and is preferably located on the same center line as the section forming area 110.

As shown in Fig. 16, the plastic film 109a (surface layer) located on the outer surface side of the box-shaped plastic film casing 102 has a butt-end seal of the box-shaped plastic film casing 102. Range from the position on the end side of the bent portion of the end portion 103b located on the valley side of the portion 103 to the position on the surface layer 109a connected to the main body portion 109 An easy-opening portion 1 1 2 is formed at the bottom. The easy-to-open portion 1 1 2 extends across the cut-piece forming area 1 10, and the width of the easy-to-open portion 1 1 2 is wider than the width of the cut-piece forming area 1 10. The easy-to-open portion 1 1 2 is formed by, for example, a perforation.

In FIG. 16, the easy-to-open portion 112 is moved from the position closer to the end portion than the bent portion of the end portion 103 b located on the valley side of the butt end seal portion 103 to the main body portion 110. An example is shown in which it is provided in a wide range up to the position on the surface layer 109 a connected to 9, but the easy-to-open portion 1 1 2 has the bent end of the end 103 b and the tear tape 1. It may be provided in a narrow area between the end portion of FIG.

As the plastic laminate packaging material forming the box-shaped plastic film outer casing 2, a laminate film obtained by laminating a biaxially oriented polypropylene film having a thickness of 20 microns and an unoriented polypropylene film having a thickness of 25 microns is laminated. And. 12-micron-thick polyester film and 15-micron-thick polyethylene film and 7-micron-thick aluminum foil and 25-micron-thickness It is preferably a laminate film having the following.

Next, the operation will be described.

When the chewing gum package 101 is commercially available, as shown in Fig. 15, the butted end 3 of the box-shaped plastic film casing 102 is the main body of the box-shaped plastic film casing 102, as shown in Fig. 15. Folded over 109.

In order for the user to break the chewing gum package 101 and remove the chewing gum-the bent end portion 103 on the box-shaped plastic film outer casing 102 of the chewing gum package 101 Raised from the main body 109, raised the butted end 103 between the pair of notches 106, 106, and butted the part from the other part of the end 103. Pull in the direction away from the main unit.

When the portion between the pair of notches 106 and 106 of the butting end portion 105 is pulled toward the main body, the butting end portion 105 becomes a pair of notches 106 and 106. Cut along the imaginary lines 107 and 107 connected to the notches 106 and 106 as a starting point, and form a tensile piece 108.

When the pulling piece 1 08 is further pulled in the direction of the main body 1 09, the pulling piece 1 08 has a butt end along the imaginary lines 1 0 7 and 1 0 7 to the bent portion of the main body 1 0 9. Disconnect. When the pulling piece 108 cuts the butt end portion 103 to the bent portion of the main body portion 109, the leading end of the cutting line at the butt end portion reaches the main body portion 109 connected to the butt end portion 3. Is provided on the surface layer 109 a of the main body 109 from the bent portion of the butt end portion 103 so that the easy-to-open portion 112 extends across the cut piece forming area 110. As a result, the bent portion of the butt end portion 103 can be easily broken with a weak force.

When the pulling piece 108 is further pulled, the bent portion of the butted end portion 103 is torn, so that the box-shaped plastic film outer casing 102 cuts the main body portion 109 and the fragment forming area 110 Along the entire length, the tear tape is used as a guide and is opened along the entire circumference. Then, it is housed in the box-shaped plastic film exterior body 102. Chewing gum can be removed through the opening.

In the above-described embodiment, the easy-opening portion 112 of the main body 109 is formed by the perforation 109. However, in order to further secure the sealing property, the easy-opening portion 112 is formed by two axes. It is preferable to have a narrow rough surface (scratch surface) formed by pressing a sandpaper against the stretched polypropylene film.

The package according to the present invention is not limited by the plastic film of the box-shaped plastic film casing, and the box-shaped plastic film casing is opened linearly along the entire circumference with a small force by a weak force. The contents contained in the exterior body can be easily taken out.

Claims

The scope of the claims

1. A plastic film is folded, the both ends are overlapped, and the two ends are heat-sealed to form a joint seal portion. After forming a tubular shape, both open ends are heat-sealed. A tape-shaped unsealing piece that is inserted into one or more arbitrary parts of the part by protruding its tip and fused together,

An easy tearing process applied to the outer edge of the palm joint portion sandwiching both side edges in the width direction of the tape-shaped opening piece;

A non-fused portion on the inner side of the bag from the inner edge of the jointed seal portion of the film on the valley fold side of the jointed seal located on an extension of the length of the tape-shaped opening piece bent in the circumferential direction of the cylinder. Easy cutting processing applied to

Have

An easily openable packaging bag, comprising:

2. A gusset-shaped bag having folds at both ends of the bag

2. The easy-open packaging bag according to claim 1, wherein:

3. The other end of the tape-shaped unsealing piece is located 2 to 8 mm inside the seal from the inner edge of the joint seal and is sandwiched by the joint seal part. The easily-openable packaging bag according to 1.

4. The plastic film is laminated in the order of base film, intermediate film, and heat-sealable file

2. The easy-open packaging bag according to claim 1, wherein:

5. The intermediate film is a film having tearability in a direction perpendicular to a length direction of the gasket seal.

5. The easy-open packaging bag according to claim 4, wherein:

6. An easy-cutting process consisting of a group of fine scratches penetrating both the base film and the intermediate film laminated in advance

5. The easy-open packaging bag according to claim 4, wherein:

7. The plastic film is laminated in the order of base film, barrier film, intermediate film, and heat-sealing film

2. The easy-open packaging bag according to claim 1, wherein:

8. The barrier film is made of aluminum foil

8. The easy-open packaging bag according to claim 7, wherein:

9. The easy-opening method according to claim 7, wherein an easy-cutting process comprising a group of fine scratches penetrating all of the base film, the barrier film, and the intermediate film, which are laminated in advance, is performed. Packaging bag.

10. The easy-cutting processing is a group of fine scratches formed by pressing a jig forming a group of fine scratches penetrating the film onto the film.

2. The easy-open packaging bag according to claim 1, wherein:

11. The microscopic scars are microscopic scars formed by pressing abrasive grains against the film.

10. The easy-open packaging bag according to claim 10, wherein: -

1 2. The microscopic scar group is a microscopic scar group consisting of cuts parallel to the inner edge of the joint seal formed by pressing a blade against a film.

10. The easy-open packaging bag according to claim 10, wherein:

13. The easy cutting process is performed only at a position including an extension of the tape-shaped opening piece with a width of 1.5 to 4 times the width of the tape-shaped opening piece. 2. The easy-open packaging bag according to claim 1, wherein:

14. The easy cutting process is performed over at least the fused portion and a non-fused portion in a range of 1 to 1 O mm from the inner edge of the fused portion.

2. The easy-open packaging bag according to claim 1, wherein:

15. The easy tearing process continuously forms a large number of fine and elongated scars in a direction substantially perpendicular to the edge line of the outer edge of the palm joint seal in the longitudinal direction of the joint palm seal part. Granted

2. The easy-open packaging bag according to claim 1, wherein:

16. At least the overlapped portion of the film of the apron seal portion at the position where the tape-shaped seal is located is fused over the entire width.

2. The easy-open packaging bag according to claim 1, wherein:

17. The base film is a film that can be sealed on one side, or the seal joint is fused to the bag body by part coating

8. The easy-open packaging bag according to claim 4, wherein:

18. A box-shaped plastic film outer casing formed by bending the seals at both ends and the butt end seal toward the main body,

A pair of notches provided on the butt end seal portion of the box-shaped plastic film outer body,

A base of one end of the butted end seal portion is formed on the inner surface of the main body portion of the box-shaped plastic film in correspondence with a cut piece forming area defined by virtual parallel lines connected to the pair of notches. Tearing tape extending circumferentially from a position near the end to a position near the base end of the other end; and

The box-shaped plastic film exterior body is provided so as to extend from the valley-side bent portion of the butt end seal portion to the surface layer of the main body portion across the cut piece forming area. Opening easy part,

An easily openable packaging bag comprising:

19. The easily openable packaging bag according to claim 18, wherein the easy opening portion is a perforation.

20. The easily-openable packaging bag according to claim 18, wherein the easy-opening portion has a narrow rough surface.

21. The easily-openable packaging bag according to claim 18, wherein the width of the tear tape is smaller than the width of the cut piece forming area.