JP4060867B2 - Easy-open bag in carton - Google Patents

Description

  The present invention relates to a bag in carton capable of opening an outer box and an inner bag simultaneously and easily and cleanly.

  Proposals for opening the outer box and the inner bag at the same time can be found in, for example, Japanese Utility Model Publication No. 58-49958 and Japanese Patent Publication No. 62-58976. A so-called envelope pasting method is adopted. Further, Japanese Utility Model Application No. 3-76255 proposes an “inner bag simultaneous opening carton” using an inner bag sealed with a palm seal at the back seal portion. Both relate to a bag in carton in which a uniaxially stretched film is used for the inner bag, and the inner bag is also torn at the same time when the opening portion of the outer box is torn.

  However, in the envelope pasting method, stable thermocompression is difficult, the back seal strength is not stable, and the inner bag is tightly sealed when the inner bag base material is formed into a cylindrical shape by stacking the front and back sides. The problem of lack of reliability arises. Also, when tearing the opening part of the outer box, a part of the inner bag adhered to the back side of the tearing part is also torn at the same time, but the adhesive strength between the opening part and the inner bag is There was a problem that there was not much difference between the tear strength, particularly the tear strength of the back seal part, only the outer box was opened, and the inner bag was not opened. Furthermore, when using the inner bag sealed with the palm of the prior application, the instability of the back seal portion of the prior art is eliminated, but there is a problem that too much force is applied to the simultaneous opening with the carton. Furthermore, in the conventional technology, it is common to provide a cutting guide on the side edge of the inner bag so that the inner bag is easy to tear, but it is difficult to open if this position deviates from the tearing position of the carton. Become. This misalignment of the sticking position is caused by the fact that the sticking position accuracy is not always in a satisfactory range when a bag-in-carton is manufactured by sticking the inner bag at a predetermined position on the inner surface of the carton blank. The present invention is a technology developed in view of the above-described problems, and controls the peel strength of the back seal portion of the inner bag, and also facilitates the start and tearing of the inner bag. An object of the present invention is to provide an easy-open bag in carton that can be opened stably and cleanly with a weaker force than in the conventional case when both the carton and the inner bag are opened simultaneously.

  The present invention made to solve the above problems comprises an outer carton and an inner bag made of a laminated film, and a back seal portion formed on the inner bag and an inner surface of the opening piece of the outer carton are opposed to each other. In the arranged bag in carton, the back seal portion of the inner bag is formed by sealing the side ends facing each other in a strip shape, leaving two long and short surplus pieces on the side end of the laminated film, The easy-opening characterized in that the outer surface of the surplus piece is adhered to the inner surface of the opening piece of the outer carton and the long inner surface of the surplus piece is adhered to the inner surface of the glue margin panel of the outer carton The main point is the sex bag in carton. Further, in the inner bag, a scar is provided on the side edge of the short end of the short end, and in the laminated film of the inner bag, the uniaxially stretched film is perpendicular to the stretching direction of the uniaxially stretched film and the longitudinal direction of the back seal. Can be used. In the back seal portion, a release layer can be formed in a strip shape on either the outer surface or the inner surface of the innermost layer of at least one of the opposed laminated films. Further, in the back seal portion, the palm seal pattern has an uneven shape at least on the edge side of the surplus piece, and a strip-like scar portion is provided on the long laminated film on the surplus piece side, The uneven shape portion of the palm seal pattern can be positioned, and the strip-like pattern of the release layer formed inside the innermost layer is wider than the palm seal pattern in the back seal portion. The pattern edge on the opposite side of the edge of the surplus piece has a concavo-convex shape, the concavo-convex shape portion does not overlap the palm seal pattern, and the tip of the concavo-convex shape is the opening piece of the outer carton It can form so that it may be located in a folding | returning part.

  According to the present invention, a peeling layer is provided on the back seal portion of the inner bag, and a scar is formed so that the entire side edge of the short surplus piece connected to the back seal portion can be torn from anywhere. A strip-shaped scar that weakens the laminated material is formed on the back seal part of the long surplus piece, a uniaxially stretched film is used for the inner bag, and the formation of the palm seal part and the peeling part in the back seal part is uneven. By adopting a pattern with a shape and controlling the mutual positional relationship of the palm seal part, peeling part and scar part, it is easier, stable and clean with a uniform force weaker than before and the outer bag and inner bag Can be opened simultaneously.

  In addition, since the present invention can smoothly and stably open the carton and the inner bag at the same time with a uniform force weaker than that of the conventional easy-open bag in carton, both the outer box and the inner bag are protected. The processed foods, medicines, etc. that have been processed can be opened and removed safely and quickly, and in the case of food, it can be used as a tableware, and once opened, it cannot be restored. It can also have a mischief prevention function.

  Hereinafter, it will be described in detail with reference to the drawings. FIG. 1 is a perspective view of an embodiment of an easily openable bag in carton, FIGS. 2 and 3 are explanatory views of the structure of the inner bag, FIG. 4 is a palm seal pattern diagram, and FIG. 5 is a central section of the opening portion of the bag in carton. FIG. 6 and FIG. 7 are schematic cross-sectional views of the joint seal portion of the inner bag, FIG. 8 is a schematic cross-sectional view of the joint seal portion in the case of using the concave and convex joint seal pattern, and FIG. FIG. 10 is a perspective view of a bag in carton of another embodiment, and FIG. 11 is a pattern shape of an anti-heat sealant pattern coat. First, as shown in FIG. 1 (a), a carton opening piece 2 is provided on the front panel of the carton 1, and when the notch 3 is pulled up, a perforation 5 and a zipper 4-2 follow the zipper 4-1. When the top panel of the carton 1 that has been torn and opened to the fold line 6 is folded at the fold line 6, the top portion of the easy-open bag-in carton 20 is opened to the state shown in FIG. The tearing by the zipper 4-2 may extend beyond the folding line 6 to the ridgeline 6 'of the outer box. As shown in FIG. 1 (b), the back surface of the carton opening piece 2 and the short surplus piece 11 of the inner bag are strongly bonded to each other by an adhesive portion 15, and from two tear start points 7 of the carton opening piece 2. The short surplus piece 11 is torn simultaneously with the carton 1. At this time, the back seal part of the inner bag (hereinafter referred to as the "gap seal part 14") is peeled off and the peeled seal part 9 appears. The long surplus end portion 12 is strongly bonded to the glue margin panel 8 and remains as it is.

  FIG. 2 shows the structure of the inner bag in the center portion of the easy-open bag in carton drawn out of the inner bag 10. The short end piece 11 and the long extra end piece 12 connected to the palm seal part 14 are shown in FIG. It is provided and is folded into the front side wall of the carton 1 with the opening piece 2 with the short surplus piece 11 facing outward. The situation is clear in FIGS. 2 (a) and 2 (b). A scar 13E is formed on the side edge of the short surplus piece 11, and the inner bag can be torn from any position of the short surplus piece 11 as shown by the arrow in FIG. At this time, in order to facilitate tearing, it is preferable that the inner bag is composed of a laminated film in which uniaxially stretched films are laminated, and the above-described arrow direction and the stretch direction of the uniaxially stretched film are made to coincide. Scratches 13E are actually innumerable minute scratches formed by the method described later on the edge of the laminated film. FIG. 3 shows the structure of the same portion of the inner bag as in FIG. 2 by forming an uneven joint seal pattern on the joint seal portion 14. In addition to the linear shape (FIG. 4 (c)) formed on the inner bag 10 described with reference to FIG. 2, the shape of the joint seal pattern is shown in FIG. A concavo-convex shape such as a one-sided saw blade type can be used, and the concavo-convex shape is provided at least on the side close to the side edge of the short end piece 11 where tearing starts. 2 and 3, the structure of the inner bag 10 at both ends of the carton is not shown, but the inner bag 10 has a structure that also expands at both ends of the carton when the bag-in-carton is assembled.

  FIG. 5 is a drawing schematically showing a cross section of the central portion of the opening piece 2 in front of the easy-open bag in carton 20 shown in FIG. 1, FIG. 5 (a) before opening, and (b) after opening. Respectively. Although the inner bag 10 is a laminated film, the laminated structure is omitted and depicted as having a certain thickness. In FIG. 5 (b), the carton opening piece 2 is lifted upward with a short surplus piece 11, and as described above, the long surplus piece 12 and the glue margin panel 8 remain as they are. It shows that peeling occurs at the seal portion 14 at the same time. The gist of the present invention is that the sealed palm seal portion 14 does not require a too strong force, and is neatly and stably peeled off. For this purpose, the peeling layer described below also plays an effective role. Plays.

  FIG. 6 is an enlarged schematic cross-sectional view of the joint seal part 14 in FIG. Here, the cross section of the short surplus piece 11 and the long surplus piece 12 of the inner bag is drawn according to the layer structure of the laminated film. The laminated film used for the inner bag of the present invention employs a film composed of polyethylene layer 21 / aluminum foil 22 / polyethylene layer 21 / lateral uniaxially stretched polypropylene layer 23 in order from the inner surface. Moreover, you may use what was comprised from the inner surface in order from the inner surface from the polyethylene layer 21 / aluminum foil 22 / adhesion layer / horizontal uniaxially-stretched polypropylene layer 23 by the dry lamination system. In addition, the inner bag can be constituted by a laminated film in which at least a known barrier layer, stretched film layer and the like are appropriately laminated. As shown in FIG. 6, the release layer 17 is formed by partially coating the outer side of the polyethylene layer 21 which is the innermost layer of the laminated film so as to weaken the force at the time of opening. 6A shows a state before peeling, and FIG. 6B shows a state after peeling. In this case, the positions of the palm seal layer 16 and the release layer 17 are the same. That is, by partially coating the heat sealant on the outer side of the innermost surface layer of at least one of the laminated films facing the palm seal part 14, the heat sealant performs an adhesive action between the two laminated films, at a relatively low temperature. In addition, high-speed heat sealing becomes possible. Moreover, in the case of peeling, delamination can be caused by cohesive failure of the heat sealant layer with an appropriate force. In this case, if the peeling is to be performed with a weaker force, the heat sealing agent may be pattern-coated so that the sealing performance of the palm seal portion does not deteriorate, such as a mesh shape or a diagonal line shape. In place of the heat seal agent, an anti-seal agent based on silicone resin or the like is partially coated in a pattern such as a mesh on the innermost polyethylene layer of one laminated film, and the anti-seal agent layer is interposed through this anti-seal agent layer. The innermost polyethylene layers may be heat sealed. Furthermore, instead of the heat sealant, a cold sealant based on synthetic rubber or the like may be partially coated on both surfaces of the innermost layer.

  FIG. 7 is an enlarged schematic view of the palm seal portion 14 in FIG. 5 as well, in which the release layer is formed inside the innermost layer of the laminated film. FIG. ) Shows the state after peeling. The configuration of the laminated film is the same as in the previous figure. In this case, the joint seal is performed by heat-sealing the innermost polyethylene layers 21 of the opposite laminated film, and the release layer 17 is provided inside the innermost polyethylene layer 21 of the laminated film on the long surplus piece 12 side. Partially provided. Therefore, as shown in FIG. 7B, when the palm seal portion 14 is to be peeled off, the two polyethylene layers 21 facing each other by heat sealing are fused together to form a long surplus piece provided with the peeling layer 17. The polyethylene layer 21 on the 12th side is torn and transferred to the polyethylene layer 21 on the short end piece 11 side. If the palm seal portion 14 is peeled off by the linear heat seal bar as shown in FIG. 4 (c), the polyethylene layer 21 will be torn off twice. A large peeling force is required continuously, and smooth and stable peeling is difficult. Although the peeling resistance is slightly relieved by using the uneven heat seal bar described above, a further advanced example will be described below. In addition, in order to form a peeling layer inside the laminated film innermost layer, a phosphoric acid ester-based material described later can be suitably used.

  FIG. 8 relates to an embodiment in which peeling is further facilitated, and is a schematic cross-sectional view of the palm seal portion 14 provided with the saw blade-shaped palm seal pattern shown in FIG. In this embodiment, as shown in FIG. 8A, a strip-shaped scar 13S is formed so as to weaken the physical strength of the laminated film at a position where the saw blade portion of the palm seal pattern of the laminated film on the side of the long surplus piece 12 hits. Was provided. The cross section consists of a set of through holes penetrating the laminated film as shown in FIG. The scar 13S is initially provided in a band shape. However, when the palm seal is performed, the portion of the scar surface 13'S where the blade shape of the heat seal bar hits is crushed and the heat-sealed scar 13 "S is formed, and the innermost polyethylene layer 21 of the laminated film is easily cut at the scar surface 13'S. Therefore, the tearing of the innermost polyethylene layer 21 at the time of opening in this embodiment is horizontal. Since it is performed with a saw blade shape, the tearing occurs from the tip of the saw blade shape, the trigger for tearing is easily grasped, the resistance value at the time of the first cutting is extremely lowered, and coupled with the effect of the release layer 17 than ever before 8 (b), the peeling surface 19 of the long surplus piece 12 has an altitude indicated by a halftone dot similar to a heat seal bar, as shown in FIG. Glossy surface appears.

  FIG. 9 relates to another embodiment in which peeling resistance is weakened and peeling is further facilitated, and is a schematic cross-sectional view of a palm seal portion 14 provided with a saw blade-like peeling layer pattern. At the time of opening, the innermost polyethylene layer 21 on the side of the long surplus piece 12 must be cut once again after the first cutting as described above. In this embodiment, the resistance of the second cutting is reduced. As shown in FIG. 9A, when the pattern of the peeling surface 18 corresponding to the peeling layer 17 has passed through the palm seal portion 16, for example, irregularities are formed in a saw blade shape. By doing so, the innermost polyethylene layer 21 starts to be cut from the deepest part of the saw blade, and the cutting ends while passing through the blade mold part. Therefore, as compared with the case where the innermost polyethylene layer 21 is cut at once with the horizontal line so far, the peeling resistance is reduced, and the opening can be smoothly performed with less force. In addition, as shown in FIG. 9, it is preferable that the position where the peeling layer 17 is provided extends to the folded portion of the laminated film on the long surplus piece 12 side. FIG. 9B shows the state after peeling. On the peeling surface on the long surplus piece 12 side, after the polyethylene layer 21 is cut and peeled, an aluminum glossy surface indicated by halftone dots appears. By performing the method described above with reference to FIGS. 8 and 9 together, the discontinuous peeling resistance that has occurred twice since the cutting of the innermost polyethylene layer 21 can be eased so that the opening is uniformly weak from start to finish. Can be performed smoothly.

  As described above, there are roughly two types of peeling methods of the palm seal portion 14 used in the present invention. The first method is a method in which a heat seal agent that lowers cohesive force and easily causes cohesive failure is provided between the innermost surfaces of opposing laminated films, and ethylene-acetic acid having a vinyl acetate content of 10 to 40%. A blend of 20 to 40% vinyl copolymer, 20 to 40% tackifier, and 20 to 40% paraffin wax or microwax is preferably used. A gravure coating method may be used to partially coat the heat sealant on a predetermined place. In addition, as a variation of this method, there is also a method of facilitating peeling after heat sealing by pattern-coating a silicone-based anti-heat sealing agent between the innermost layers. In general, an anti-heat sealant containing silicone resin and cellulose resin as main components and ethyl acetate and toluene as main solvents is preferably used. In the second method, the innermost surfaces are completely heat-sealed by heat sealing, but a release layer is provided inside the innermost layer of one of the laminated films, and carbon is added to 100 parts by weight of the acrylic resin. A resin comprising 0.1 to 5.0 parts by weight of a polyoxyethylene alkyl (or alkylallyl) ether phosphate having an alkyl group or an alkylphenyl group of several to 30 is preferably used. For the partial coating of the peelable resin, a gravure ink varnish (hereinafter referred to as weak laminus) composed of 40% resin solids and 60% toluene may be partially coated at a predetermined location by a gravure method. In the case of weak laminus, the peeling force can be controlled by changing the proportion of the phosphate ester component.

  The scars used in the present invention are band-like or linear with many scratches that cannot be easily identified with the naked eye densely from one side of the film to the other side, or from the edge of the film to the inside. Is provided. The size density of individual scars varies depending on the type, thickness, processing method, and the like of the film, and there are those that penetrate the film, those that have only shallow missing portions, and those that are locally stretched. Although the scar shown schematically in FIG. 8 is written in a form that penetrates the laminated film cleanly, it actually has a very complicated shape. In the case of an inner bag made of a laminated film that is relatively thick and difficult to tear, it is preferable to provide many thick and sharp scars. In order to provide the above-mentioned scratches at a predetermined position so as to coincide with the position of the palm seal of the laminated film as shown in FIG. 8, as proposed in Japanese Patent Publication No. 61-39228, a winding shape When a rotating grindstone including relatively large abrasive grains having a predetermined width in the flow direction of the laminated film is pressed, a deeply penetrating band-shaped scar is obtained. Moreover, in order to provide a scar on the end surface of the film, it may be slit in the middle of the band-shaped scar provided by the above-mentioned method, or the side surface of the take-up roll once wound up neatly may be wire brushed or bonded to abrasive grains. You may make it rub with a sheet material etc.

  FIG. 10 shows a perspective view of another bag-in-carton embodiment 20 '. The principle of opening is exactly the same as described above, but the carton structure is slightly different so as to be suitable when a large opening is desired. First, when the zipper 4'-1 is cut horizontally from the notch 3 ', a short surplus piece 11 appears at the zipper opening of the front panel. Next, when opening along the perforation 5 'and the zipper 4'-2 from the left and right ends of the opening piece 2', the inner bag is also torn at the same time and opening is performed.

  The outer box paperboard used in the present invention is preferably a normal coated ball, but other paperboards can also be used. The basis weight can be appropriately selected from 250 to 400 g / m @ 2 depending on the size and application of the outer box. The form of the bag-in carton used in the present invention is preferably such that the inner bag 10 is partially pasted in advance on the inner surface of the carton blank. In particular, the unsealing piece 2 of the carton 1 is connected to the palm seal part 14. Although it is an absolute condition that it is strongly bonded to the short surplus piece 11 that is present, the bonding of the carton 1 and the inner bag 10 around the carton opening portion facilitates opening. As an adhesive between the carton 1 and the inner bag 10, an adhesive mainly composed of a resin made of vinyl acetate / acrylic copolymer is preferably used.

Hereinafter, the ease of opening will be compared with examples and comparative examples, but the layer structure of the laminated film of the inner bag 10 will be shown using the following symbols in order from the outside.
OPP: Stretched polypropylene MOPP: Polypropylene transverse uniaxially stretched film PE: Polyethylene Al: Aluminum foil HS: Heat sealant AS: Anti-sealant CS: Cold sealant Weak Lami: Weak laminis coat layer CPP: Unstretched polypropylene film DL: For dry lami Adhesive (Example 1) MOPP 25 μm / PE 15 μm / aluminum deposition OPP 20 μm / HS
HS is provided on one of the opposing OPPs.
(Example 2) MOPP 25 μm / PE 15 μm / Al 7 μm / PE 30 μm / HS
HS is provided on both sides of the opposing PE.
(Example 3) MOPP 25 μm / PE 15 μm / Al 7 μm / PE 30 μm / AS
AS uses an anti-sealant based on silicone resin. The pattern preferably has a shape that leaves the PE layer in a mesh shape as shown in FIG.
(Example 4) MOPP 25 μm / PE 15 μm / Al 7 μm / Weak Lami / PE 30 μm
A weak laminar layer is provided on the inner surface of one PE layer of the opposing PE layer.
(Example 5) MOPP 25 μm / PE 15 μm / Al 7 μm / PE 30 μm / CS
CS is provided on both sides of the opposing PE.
(Comparative example 1) Although it is the same structure as the said Example 2, an HS layer is provided only in one of the PE layers which oppose.
Comparative Example 2 MOPP 25 μm / PE 15 μm / Al 7 μm / CPP 35 μm
Comparative peeling strength test method for peeling effect: According to JIS-Z1707.

Furthermore, the sample test was carried out also with respect to the following examples and comparative examples in the case where the palm seal pattern and the release layer pattern were both saw-blade patterns.
Example 6
MOPP25μm / PE15μm / Al7μm / Weak Lami / PE30μm
A weak lamellar layer was provided on the inner surface of one PE layer of the opposing PE layer. The joint seal pattern and the weak laminar pattern were both saw-blade patterns.
Example 7
MOPP25μm / DL / Al7μm / Weak Lami / PE30μm
A weak lamellar layer was provided on the inner surface of one PE layer of the opposing PE layer. The joint seal pattern and the weak laminar pattern were both saw-blade patterns.
Comparative Example 3
Although it is the same structure as Example 1, the thing of the conventional linear shape was used with the palm seal pattern and the weak laminating pattern.
When each of the above 20 samples was prepared and an opening test by 5 persons was conducted sensuously, the comparative example felt resistance over two stages at the time of opening, but in the case of Examples 6 and 7, both were comparative examples. Compared with the resistance, it could be opened stably with almost uniform force with almost no resistance. There was almost no difference between Examples 6 and 7.

Perspective view of one embodiment of easy-open bag in carton Structure diagram of inner bag Structure diagram of inner bag Gasket seal pattern illustration Easily openable bag in carton front opening center cross section Schematic cross-sectional view of the joint seal when the release layer is outside the innermost layer Schematic cross-sectional view of the palm seal when the release layer is inside the innermost layer Cross-sectional schematic diagram of the palm seal part provided with a saw blade-shaped joint seal pattern Cross-sectional schematic view of the palm seal part provided with a saw blade-like release layer pattern Other embodiment perspective view of easy-open bag in carton Pattern shape of anti heat sealant pattern coat

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Carton 2 Carton opening piece 3 Notch 4-1 Zipper 4-2 Zipper 5 Perforation 6 Folding line 6 'Outer box ridge line 7 Tear start point 8 Glue margin panel 9 Peeled joint seal part 10 Inner bag 11 Short surplus piece 12 Long surplus piece 13E Scar 13 S Scratch 13'S Scar 13 "S Heat-sealed scar 14 Joint seal part 15 Adhesion part 16 Joint seal layer 17 Peel layer 18 Peel part 19 Peel surface 20 on the long side piece side 20 Easy-open bag-in carton 20 'Other examples of easy-open bag-in carton 21 Polyethylene layer 22 Aluminum layer 23 Uniaxially oriented polypropylene layer

Claims (3)

In a bag in carton comprising an outer carton and an inner bag made of a laminated film, the back seal part formed on the inner bag and the inner surface of the opening piece of the outer carton facing each other, the back of the inner bag The sealing portion is formed by sealing the side ends facing each other in a strip shape, leaving two long and short surplus pieces on the side end of the laminated film, and the outer surface of the short surplus piece is the opening of the outer carton Adhering to the inner surface of the piece, the inner surface of the long surplus piece adhering to the inner surface of the glue panel of the outer carton, and the inner surface of the innermost layer of at least one of the laminated films facing each other at the back seal portion An easy-open bag in carton in which a release layer is formed in a strip shape,
In the back seal portion, the strip-like pattern of the release layer formed inside the innermost layer is wider than the joint seal pattern, and has a concavo-convex shape on the pattern edge opposite to the edge of the surplus piece. The easy-to-open bag is characterized in that the concavo-convex portion does not overlap with the palm seal pattern, and the tip of the concavo-convex shape is formed so as to be located at the folded portion of the opening piece of the outer carton. In carton. The easily openable bag in carton according to claim 1, wherein the inner bag is provided with a scar on the short side edge of the surplus end. The easy-opening according to claim 1 or 2, wherein in the laminated film of the inner bag, the uniaxially stretched film is used such that the stretch direction of the uniaxially stretched film and the longitudinal direction of the back seal are perpendicular to each other. Sex bag in carton.

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