JP5916798B2 - Easy-open packaging bag - Google Patents

Description

  The present invention relates to an easy-open packaging bag, and more particularly to an easy-open packaging bag in which a laminated structure sealing body is provided on the opening side in the bag body.

  As one of the packaging bags, an easy open type is widely used. In this case, an easily peelable sealing body is provided on the opening side in the bag body. Many of the packaging bags adopting the easy open type are made of plastic (synthetic resin).

  As is well known, the sealing function of the packaging bag is to prevent foreign matter from entering the bag from the outside of the bag or to prevent leakage of the bag contents from the inside of the bag to the outside of the bag. On the other hand, in the case of an easy-open packaging bag, weight is placed on facilitating the opening of the seal portion. This means that the sealing function and the easy open function are opposed to each other in terms of function. Therefore, in the case of a bag with improved sealing performance, opening is not easy, and on the contrary, in the case of a bag with improved easy opening performance, the sealing function is lowered and foreign matter intrusion and leakage of bag contents are likely to occur.

  Each of the packaging bags disclosed in the following Patent Documents 1 to 5 has a seal body for easy opening provided inside the opening. Among these, there is one in which an opening / closing tool such as a chuck is provided inside the opening. When the seal function and the easy open function conflict in an easy-open packaging bag, it can be said that it is technically difficult to maintain a high level of the easy open function while ensuring sufficient seal function. . By the way, when a packaging bag giving priority to easy peelability is heat-treated at a high temperature by heating in a microwave oven or hot water bath, the inside of the bag becomes a considerably high pressure, which may cause seal breakage. In an existing easy-open packaging bag, it is difficult to satisfy the easy-open property from the opening side while ensuring a high sealing performance to withstand such pressure. In addition, even in the case of a packaging bag provided with an easy-open sealing body and an opening / closing tool (eg, a chuck), the pressure resistance against the high pressure is not sufficient. Therefore, when trying to implement an easy-open packaging bag that can satisfy such requirements, new means are required.

  In response to the above requirements, the packaging bags disclosed in the following Patent Documents 6 to 7 are said to be able to withstand a large bag pressure. The reason is that the sealing body having a laminated structure composed of the low adhesive layer and the high adhesive layer is skillfully attached to the inner surface of the bag front film and the inner surface of the bag back film. That is, as for the opening force from the opening side of the bag, since this extends to the low adhesive layer side, opening from the opening side of the bag can be easily performed, and for the internal pressure of the bag, this is only on the lower side of the high adhesive layer. Therefore, it is difficult for the seal to break. Therefore, in the case of the easy open type packaging bags disclosed in Patent Documents 6 to 7, it can be said that both high sealability capable of withstanding high bag internal pressure and easy openability from the opening side are achieved.

Japanese Patent Laid-Open No. 57-096952 Japanese Utility Model Publication No. 57-105248 JP 62-271847 A Japanese Patent Laid-Open No. 02-242748 Japanese Utility Model Publication No. 06-014044 JP 2006-264746 A JP 2008-046771 A

  As described above, the easy-open packaging bags of Patent Documents 6 to 7 are desirable in terms of achieving both the seal resistance against the bag internal pressure and the easy-open property of the bag opening. However, these still have problems to be improved.

  One of the problems lies in the packaging bag of Patent Document 6. Because the upper end side of the low adhesive layer is fully bonded (thermally welded) to the inner surface of the bag surface film (or bag back film) without the non-adhesive part, the low adhesive layer is attached to the inner surface of the bag surface film. It requires a large initial force when it is peeled off. In the case of such a packaging bag, it is difficult to say that the peelability is sufficient. In addition, Patent Document 6 does not disclose a technical disclosure for easily setting the peel strength from the opening side and the peel strength from the bag inner side to the required values in the easy open packaging bag.

  Another problem is the packaging bag of Patent Document 7. That is, in the case of the document bag, in most embodiments, two sealing bodies having a laminated structure (low adhesion layer + high adhesion layer) are used. This is not only costly as compared to the case of using one seal body, but also the seal portion becomes too thick, and unnecessary tension is generated on the opening side. When two seal bodies are used, the high adhesive layer of both seal bodies is strongly adhered to the inner surface of the bag front film and the inner surface of the bag back film, and the low adhesive layer of both seal bodies is entirely bonded. Since it will be weakly bonded, the pressure resistance against the bag internal pressure cannot be set freely using the weakly bonded state of both low adhesive layers. In addition, Patent Document 7 describes an example in which one seal body is used. However, in the case of this example, there is no particular disclosure about easily setting the peel strength from the opening side and the peel strength from the bag inner side to the required values in the easy open type packaging bag.

  As is generally true for packaging bags, it is no exaggeration to say that a universal type that is suitable for all packaging or that fulfills all packaging needs is not feasible. Even if easy-open packaging bags are limited to their easy peelability, it is extremely difficult to achieve universality with a single pattern. Even if it is the same easy open type, easy peel strength (easy peelability) is set based on adhesive strength depending on whether pressure resistance at the seal location is given priority or easy peelability at the seal location is given priority This is because they are very different. More specifically, in the easy open type packaging bag handled by children and the elderly and the easy open type packaging bag handled by general adults, the former bag gives priority to easy peelability over the latter bag. Become. In other words, the easy peel strength of the latter bag is greater than that of the former bag. Furthermore, in the case of an easy-open packaging bag that is subjected to high-temperature heat treatment, the pressure resistance of the sealed portion is higher than that of an easy-open packaging bag that does not receive the heat treatment.

  Under these circumstances, easy-open packaging bags and the like have to be individually produced according to the application and user conditions. This tends to result in high-mix low-volume production and varietal-variable-volume production, thus reducing the benefits of mass production. In addition, since the device must be changed every time the product type is changed, the burden on the equipment becomes large.

  Therefore, for easy-open packaging bags, satisfying the required characteristics such as high ease of peeling and high sealability, and bags that can be produced more easily, and rationalize such bags. There is a need in the art for a means to fabricate.

  In view of such problems, the present invention is intended to provide an easy-open packaging bag that has a high degree of easy peelability and a high degree of sealability with a simple configuration and can achieve high production. is there.

The easy-open packaging bag according to the present invention has the technical contents described in the following <01> to <09> as means for solving the above-described problems.
<01> A bag body having a bag surface film and a bag back film and formed into a bag shape has an opening on the upper end side thereof; and
A sealing body having a laminated structure provided on the opening side in the bag body and extending between both side portions of the bag body includes a horizontally long tape-like low adhesive layer and a horizontally long tape-like high adhesive layer, and the seal. For the two layers of the body, the layer surface of the low adhesion layer forming one side of the seal body is weakly adhered to the inner surface of the one film while maintaining easy peelability to the one film. The layer surface of the highly adhesive layer forming the other surface of the sealing body is strongly adhered to the inner surface of the other film while maintaining the hard-to-peel property to the other film, and the one film When the adhesive strength of the low adhesive layer to the inner surface is an easily peelable adhesive strength and the adhesive strength of the high adhesive layer to the other film inner surface is an easily peelable adhesive strength, the easily peelable adhesive strength is Difficult In easy-open packaging bags that are assumed to be below the peelable adhesive strength,
There is a relative height difference between the upper end of the low adhesive layer and the upper end of the high adhesive layer in the sealing body, and the upper end of the high adhesive layer is above the upper end of the low adhesive layer. Protruding, and
On the upper surface of the low adhesion layer, a horizontally long non-adhesive band extending between both sides of the bag body is integrally formed, and below the non-adhesive band on the lower adhesive layer surface, A horizontally-long adhesive band extending between both sides in the bag is integrally formed; and
The adhesive surface in the adhesive band portion of the low adhesive layer is weakly bonded to the inner surface of the film in a facing relationship with the adhesive surface, and the non-adhesive surface in the non-adhesive band portion of the low adhesive layer is in a facing relationship with this. Non-adherent to the inner surface of a film, and
On the upper layer surface of the high adhesive layer, a horizontally long band-shaped adhesive band extending between both sides in the bag body is integrally formed, and
The adhesive surface in the adhesive band portion of the high adhesive layer is strongly bonded to the inner surface of the film in a facing relationship with this, and
About the upper side of the adhesive band of the low adhesive layer and the upper end of the high adhesive layer, the upper side of the adhesive band of the low adhesive layer is lower than the upper end of the high adhesive layer, and the low adhesive layer the adhesive strip portion upper side of the adhesive strip portion upper side and the high adhesive layer, the adhesive strip portion upper side of the low adhesive layer is in a position lower than the adhesive strip portion upper side of the high-adhesion layer, and,
The low adhesive layer on the upper end side of the low adhesive layer between the one film inner surface to which the low adhesive layer is weakly bonded and the upper inner surface of the high adhesive layer facing the one film inner surface And a gap based on the relative height difference between the upper end portion and the high adhesive layer is interposed, and
The upper end of the bag front film and the upper end of the bag back film are gripped when the adhesive surface of the low adhesive layer that is weakly bonded to the inner surface of one of the films is peeled off from the inner surface of the film. Are separated in directions away from each other, and the upper end portions of the respective layers are separated from each other to peel the adhesive surface of the low adhesive layer from the inner surface of the one film, and
The initial peeling load when peeling the low adhesive layer from the inner surface of the one film is applied to the weak adhesive region on the upper side of the adhesive band portion in the weak adhesive state of the low adhesive layer. Open type packaging bag.
<02> A bag body having a bag surface film and a bag back film and formed into a bag shape has an opening on its upper end side; and
A sealing body having a laminated structure provided on the opening side in the bag body and extending between both side portions of the bag body includes a horizontally long tape-like low adhesive layer and a horizontally long tape-like high adhesive layer, and the seal. For the two layers of the body, the layer surface of the low adhesion layer forming one side of the seal body is weakly adhered to the inner surface of the one film while maintaining easy peelability to the one film. The layer surface of the highly adhesive layer forming the other surface of the sealing body is strongly adhered to the inner surface of the other film while maintaining the hard-to-peel property of the other film, and the highly adhesive layer In the lower part of the surface of the layer, a horizontally long strip-like free part extending over both sides of the highly adhesive layer is included, and the free part is released from the other film inner surface, and
When the adhesive strength of the low adhesive layer to the inner surface of the one film is an easily peelable adhesive strength and the adhesive strength of the high adhesive layer to the inner surface of the other film is an easily peelable adhesive strength, easily peelable Easy-open packaging bags that assume that the adhesive strength is less than the peel-resistant adhesive strength,
There is a relative height difference between the upper end of the low adhesive layer and the upper end of the high adhesive layer in the sealing body, and the upper end of the high adhesive layer is above the upper end of the low adhesive layer. Protruding, and
On the upper surface of the low adhesion layer, a horizontally long non-adhesive band extending between both sides of the bag body is integrally formed, and below the non-adhesive band on the lower adhesive layer surface, A horizontally-long adhesive band extending between both sides in the bag is integrally formed; and
The adhesive surface in the adhesive band portion of the low adhesive layer is weakly bonded to the inner surface of the film in a facing relationship with the adhesive surface, and the non-adhesive surface in the non-adhesive band portion of the low adhesive layer is in a facing relationship with this. Non-adherent to the inner surface of a film, and
On the upper layer surface of the high adhesive layer, a horizontally long band-shaped adhesive band extending between both sides in the bag body is integrally formed, and
The adhesive surface in the adhesive band portion of the high adhesive layer is strongly bonded to the inner surface of the film in a facing relationship with this, and
Regarding the upper side of the adhesive band part of the low adhesive layer and the upper side of the adhesive band part of the high adhesive layer, the upper side of the adhesive band part of the low adhesive layer is lower than the upper side of the adhesive band part of the high adhesive layer, and
About the upper side of the adhesive band of the low adhesive layer and the upper end of the high adhesive layer, the upper side of the adhesive band of the low adhesive layer is lower than the upper end of the high adhesive layer, and the low adhesive layer the adhesive strip portion upper side of the adhesive strip portion upper side and the high adhesive layer, the adhesive strip portion upper side of the low adhesive layer is in a position lower than the adhesive strip portion upper side of the high-adhesion layer, and,
The low adhesive layer on the upper end side of the low adhesive layer between the one film inner surface to which the low adhesive layer is weakly bonded and the upper inner surface of the high adhesive layer facing the one film inner surface And a gap based on the relative height difference between the upper end portion and the high adhesive layer is interposed, and
The upper end of the bag front film and the upper end of the bag back film are gripped when the adhesive surface of the low adhesive layer that is weakly bonded to the inner surface of one of the films is peeled off from the inner surface of the film. Are separated in directions away from each other, and the upper end portions of the respective layers are separated from each other to peel the adhesive surface of the low adhesive layer from the inner surface of the one film, and
The initial peeling load when peeling the low adhesive layer from the inner surface of the one film is applied to the weak adhesive region on the upper side of the adhesive band portion in the weak adhesive state of the low adhesive layer. Open type packaging bag.
<03> Regarding the vertical width of the adhesive band on the surface of the low adhesive layer and the vertical width of the non-adhesive band, the vertical width of the adhesive band is S11, and the vertical width of the non-adhesive band is S12. In this case, the easy open type packaging bag described in <01> or <02> above, wherein the vertical width of the two belt portions satisfies the relationship [S11 ≧ S12] .
<04> On the layer surface of the low adhesion layer, there is a non-adhesive band at the upper part of the layer surface, and there are also intermediate non-adhesive bands at the upper and lower intermediate parts of the layer surface. Is non-adhering to the film inner surface facing this
The easy open type packaging bag according to any one of <01> to <03> above .
<05> The low-adhesion layer and the high-adhesion layer are directly strongly bonded via the facing portions of both layers.
The easy open type packaging bag according to any one of <01> to <04> above .
<06> An intermediate layer is interposed between the low adhesive layer and the high adhesive layer, and the intermediate layer is strongly bonded to both the low adhesive layer and the high adhesive layer via both sides thereof. ing
The easy open type packaging bag according to any one of <01> to <05> above .
<07> The adhesive surface of the adhesive band of the low adhesive layer is weakly bonded to the inner surface of the film in a face-to-face relationship so that the interface can be peeled off.
The easy open type packaging bag according to any one of <01> to <06> above .
<08> An opening / closing tool comprising a male opening / closing member that can be opened and closed and a female opening / closing member is disposed between both side portions of the bag body along the seal body provided on the opening side of the bag body. And both opening and closing members of the opening and closing tool are respectively bonded to the inner surfaces of the two films.
The easy open type packaging bag according to any one of <01> to <07> above .
<09> The easy-open packaging bag according to <08>, wherein an opening / closing tool including a male opening / closing member and a female opening / closing member that are freely openable / closable is provided below the seal body .

[Ease of opening from the bag opening side]
In the easy-open packaging bag, the sealing body having a laminated structure having a low adhesive layer and a high adhesive layer is interposed at a predetermined portion between the bag front film and the bag back film, and the inner surfaces of both films The predetermined portion is sealed. Furthermore, in the case of a low-adhesion layer, it is easily adhered to the inner surface of one film while maintaining easy peeling, and in the case of a high-adhesion layer, it is difficult to peel and is strongly adhered to the other inner surface. It is. As a matter of course, the adhesive strength of both layers that determines the peel resistance is that the adhesive strength of the low adhesive layer to one film inner surface (adhesive strength of easy peeling) is that of the high adhesive layer to the other film inner surface. It is far below the adhesive strength (hard peelable adhesive strength). Therefore, in the case of this packaging bag, after gripping the upper edge of both films on the upper edge of the bag with the opening, only the low adhesive layer is peeled from the inner surface of one film by pulling the upper edges of the films in the opening direction. As a result, the seal is released (opened). By opening the bag by releasing the seal, the opening of the bag can be opened.

[Prevention of seal collapse due to bag pressure]
When the low-adhesion layer and the high-adhesion layer of the sealed body are compared in the easy-open packaging bag, as described above, the seal strength (weakly bonded side) of the low-adhesion layer is the same as that of the high-adhesion layer (strong). It is much lower than the adhesive side. Therefore, when a bag internal pressure exceeding the predicted value is generated, the bag content (filler) is caused by an unintentional seal collapse that the low adhesive layer peels off from the inner surface of one film due to the bag internal pressure. Leaks. In this regard, since there is a horizontally long strip-like free portion below the surface of the highly adhesive layer, this type of seal collapse is prevented. That is, in the case of a highly adhesive layer having a horizontally long strip-like free part at the lower part of the layer surface, the bag internal pressure also reaches the space between one film inner surface and the highly adhesive layer free part. Acts to press the lower part of the low adhesion layer toward the inner surface side of one film. As is obvious, the action of the compression force at this time is opposite to the peeling action of the low adhesive layer. Moreover, such a compression action occurs every time the bag pressure increases. Therefore, in the case of this easy open type packaging bag, the situation where the low adhesive layer is peeled off due to the internal pressure of the bag is extremely difficult to occur.

  The easy open type packaging bag according to the present invention has, as a basic characteristic, a function of preventing the collapse of the seal due to the ease of opening from the above-described bag opening side and the pressure inside the bag, but besides this, It has the effects described in <21> to <25> below.

<21> The low adhesive layer and high adhesive layer of the sealing body adhered to the inner surface of both the film for the front and back of the bag, as described above, exhibit an adhesive holding function based on the difference in adhesive strength between the two layers. The easy peelability is also possible. Therefore, when an opening force is applied to the bag opening by a well-known operation, any one of delamination, cohesive delamination, interfacial delamination, etc. occurs between one film and the low adhesion layer, and as a result The bag opening in the state will be opened. In this case, regarding the adhesion holding function of the sealing body (the weak adhesion function between one film and the low adhesion layer and the strong adhesion function between the other film and the high adhesion layer), it can cope with all in one form. In general, it can only be applied to packaging for very limited uses. In the case of the packaging bag according to the present invention for this, in one or more parts selected from the upper layer surface of the low adhesive layer, the lower layer surface of the low adhesive layer, and the upper layer surface of the high adhesive layer, The non-adhesive band part is integrally formed, and the non-adhesive surface for setting the peel strength of the non-adhesive band part is non-adhering to the inner surface of the film in a facing relationship with the non-adhesive band part. That is, this can be freely set within the range of 2 to 4 and the number of non-adhesion sites of the low adhesion layer / high adhesion layer when including the existing free part at the lower layer surface of the high adhesion layer. Therefore, it is possible to freely change the weak adhesion function between one film and the low adhesion layer and the strong adhesion function between the other film and the high adhesion layer. From another point of view, this leads to the advantage that easy-open packaging bags suitable for various applications can be easily produced. Furthermore, even with regard to easy-open packaging bags for the same application, if the easy peelability of the bag opening is adjusted by the vertical width of the non-adhesive band or the number of non-adhesive bands, the It will be easy to use for each user, such as for children.
<22> In the easy-open packaging bag, the existing free part at the lower part of the surface of the high adhesive layer can be regarded as a non-adhesive band part. The easy open type packaging bag with this free part is especially desirable, including the free part (non-adhesive band part), the upper and lower parts of the surface layer of the low adhesive layer, the upper and lower parts of the layer surface of the high adhesive layer, etc. In other words, non-adhesive band portions are formed, that is, non-adhesive band portions are formed on both upper and lower portions (four locations in total) of the sealing body. If there are non-adhesive strips at these four locations, it is possible to adjust the above-mentioned weak adhesive function and strong adhesive function in various ways just by increasing or decreasing the vertical width of each non-adhesive strip, Almost all of the strong and weak adhesive functions can be covered. Therefore, an easy-open packaging bag suitable for various uses, various requirements, many users, and others can be easily realized for those having non-adhesive bands at four predetermined locations.
<23> The non-adhesive band portion in the easy-open packaging bag is effective in realizing various forms of weak adhesive function and strong adhesive function. The vertical width of the part is set. In general, for such an easy-open packaging bag, the specifications of the apparatus must be changed whenever the product specifications differ. In particular, when a special seal is applied to the inside of the bag, the cost required for modification of the main part of the manufacturing apparatus tends to increase, and the downtime of the manufacturing line tends to become longer due to the specification change. Of course, these increase the cost of the product. On the other hand, in the case of the easy open type packaging bag of the present invention in which the required weak adhesive function and strong adhesive function are determined by the vertical width of the non-adhesive belt portion, the following is performed. In other words, the adhesive means (seal means) between the film for the front and back of the bag and the sealing body can be changed in various ways, such as by replacing the seal bar or the attachment for changing the seal width. In addition, there is almost no increase in the number of processes due to this specification change. This means that, from the standpoint of bag production, even if it is a highly functional easy-open packaging bag that can meet a specific application, it can be manufactured while maintaining the previous levels of initial cost and running cost. In addition, a wide variety of easy-open packaging bags can be manufactured with a single manufacturing facility. Therefore, the production cost of the high-function easy-open packaging bag can be suppressed.
<24> In the easy-open packaging bag according to the present invention, the sealing body having the low adhesive layer and the high adhesive layer is located between the inner surfaces of the film for the front and back of the bag and is in an adhesive state therewith. Is. When a peeling force is applied to these three bonded states, the peeling force acts in a direction to separate the two film surfaces from each other. Furthermore, when the peeling force is due to the bag internal pressure, the initial peeling load is applied to the lower end of the seal body, and when the peeling force is an opening force for opening the bag, the initial peeling at that time A load is applied to the upper end of the seal body. Then, peeling starts when the initial peeling load exceeds the adhesive force of the bonding portion, and the peeling state grows by receiving the peeling load thereafter. As is obvious, the degree of difficulty in peeling determined by the strength of the seal is as follows. That is, when a large initial peeling load is required, the peeling degree is high (low peeling degree), and conversely, when a small initial peeling load is sufficient, the peeling degree is low (high peeling degree). . The degree of peeling difficulty at this time also changes depending on the position and situation where the initial peeling load is applied. Therefore, the upper and lower ends of the low-adhesive layer and the upper and lower ends of the high-adhesive layer, such as the upper and lower ends of the seal body that receives the initial peeling load, are important parts that determine the easy openability of the packaging bag. become. In other words, by determining the strength of the seal using the upper and lower ends of the low adhesive layer and the upper and lower ends of the high adhesive layer that are in an adhesive state with the two films, this type of peeling difficulty can be accurately set, As a result, it leads to precisely setting the weak adhesion function (degree of easy peelability) between one film and the low adhesion layer. In this case, in the case of the easy open type packaging bag according to the present invention, the initial width is adjusted by adjusting the vertical width of the non-adhesive band portion formed at the upper and lower end portions of the low adhesive layer and the upper and lower end portions of the high adhesive layer. The position where the peeling load is applied can be set precisely. Therefore, a desired product can be obtained with high accuracy with respect to easy peelability of the easy-open packaging bag.
<25> In the case of an easy-open type packaging bag where the initial peel load application position is precisely finished as described above, the specified location of the bag (the upper end of the low adhesive layer bonded to the inner surface of one film) Since the initial peeling load at the time of opening the bag is concentrated on the part), the peeling response at the time of opening the bag is also good.

It is the principal part front view and principal part longitudinal cross-sectional view which showed schematically one Embodiment of the easy open type packaging bag which concerns on this invention. It is the principal part longitudinal cross-sectional view which showed the various sealing patterns by a sealing body about the easy open type packaging bag of the said one Embodiment. In the easy open type packaging bag of the above-mentioned embodiment, it is a principal part longitudinal cross-sectional view showing various seal patterns by a seal body of a mode different from the above. It is a principal part longitudinal cross-sectional view which showed a group of sealing bodies used with the easy open type packaging bag of the said one Embodiment. It is the principal part longitudinal cross-sectional view which showed another group about the sealing body used with the easy open type packaging bag of the said one embodiment. It is the principal part longitudinal cross-sectional view which showed the further modification of the sealing body used in the said one Embodiment, and the modification of the adhesion aspect. It is the principal part front view which outlined various other embodiment about the easy open type packaging bag which concerns on this invention, and the principal part longitudinal cross-sectional view which showed the other example of the seal body adhesion example. It is the block diagram which showed one Embodiment of the processing line by a series of processes about the sealing processing method inside the packaging bag which concerns on this invention. It is the top view which briefly outlined the said embodiment of this invention seal processing method with the manufacturing line, the front view, the longitudinal cross-sectional view of a part sealing means, and the longitudinal cross-sectional view of the components. It is the block diagram which showed other embodiment of the processing line by a series of processes about the sealing processing method inside the packaging bag which concerns on this invention. It is the top view which showed the said other embodiment of this invention sealing processing method with the manufacturing line schematically, and its front view.

  First, various embodiments of an easy-open packaging bag according to the present invention will be described with reference to FIGS.

  As an easy open type packaging bag according to the present invention, those illustrated in FIGS. 1A and 1B relate to one embodiment thereof. The easy-open packaging bag according to the present invention may be simply referred to as “packaging bag” below.

  In the packaging bag of one embodiment illustrated in FIGS. 1 (A) and 1 (B), the bag body 11 includes a bag surface film 12 and a bag back film 13 and is formed in a bag shape. It is what has been. About both films 12 and 13, there exist what consists of a single film material, and what consists of a several film material. In the case of a single film material, the films 12 and 13 are folded in half on the bag bottom side. Therefore, both films 12 and 13 are continuous on the bag bottom side. In the case of a plurality (two sheets) of film materials, both films 12 and 13 have side seal portions 15 and 16 on both sides thereof, and bottom seals not shown in FIG. Part and top seal part. Although this is not shown in FIG. 1, the bag body 11 may be provided with a known bottom gusset on the bottom side. The bag body 11 has an opening 14 on the upper end side. When the bag body 11 is unused or unused, either the bag bottom or the top of the bag is in an unsealed state, and therefore the bag body 11 has no bottom seal portion or top seal portion. As is well known in the case of bagging, an article to be packaged is packed into the bag body 11 from an unsealed portion in an open state, and the unsealed portion is sealed after the bagging. On the other hand, in the case of the bag body 11 in which a seal body 21 and an opening / closing tool 31 to be described later are provided on the opening 14 side, the top seal may not be applied depending on the application.

  The bag surface film 12 and the bag back film 13 of the bag 11 are made of known materials. A typical example thereof is made of synthetic resin (made of plastic), in particular, made of thermoplastic synthetic resin. The synthetic resin may be crystalline or amorphous. Of course, both the films 12 and 13 are not limited to these synthetic resins. Specific materials for the films 12 and 13 include the following. Examples of the PE system include low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, metallocene polyethylene, ethylene-vinyl acetate copolymer film (EVA), and PE sealant film. As a part of PP system, unstretched polypropylene and biaxially stretched polypropylene can be mentioned. Examples of a part of nylon (registered trademark), that is, polyamide, include stretched polyamide, K-coated polyamide, unstretched polyamide, and the like. Examples of other synthetic resins include polyvinylidene chloride, polyethylene terephthalate, polyester, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polystyrene, styrene, and the like. As materials for the films 12 and 13, materials other than synthetic resins can also be employed. The material may be paper, cellophane, woven fabric, non-woven fabric, aluminum foil, etc., but such non-synthetic resin materials may be coated with synthetic resin materials or laminated with synthetic resin materials. The embodiment is used. Among them, aluminum vapor deposition films and coextruded films are also included. Regarding the films 12 and 13, in view of the manufacturing conditions, applications and others of the packaging bag, materials satisfying them are selected from the above listed. From the viewpoint of processing, both the films 12 and 13 are often subjected to heat sealing means in the manufacture of the bag. Therefore, when such a situation is taken into consideration, both films 12 and 13 made of a thermoplastic synthetic resin having a good heat sealability (thermal welding property) are selected as the both films 12 and 13. Regarding other than this, when the synthetic resin material and the non-synthetic resin material are both laminated films 12 and 13 and are put on the heat sealing means at the time of film lamination, The synthetic resin material layer for maintaining heat sealability is present at least on the inner surface side of the film.

  As is apparent with reference to FIGS. 1A and 1B, a laminated structure sealing body 21 having a plurality of layers is provided on the opening side in the bag body 11. The laminated structure 21 includes at least a low adhesion layer 22 and a high adhesion layer 23. Accordingly, in the example of the sealing body 21, the one having the smallest number of layers has a two-layer laminated structure, and the other sealing bodies 21 have a three-layer or more laminated structure. Incidentally, the sealing body 21 illustrated in FIG. 1 has a three-layer laminated structure. Of the three layers, one is a low adhesive layer 22 in the form of a horizontally long tape, the other is a high adhesive layer 23 in the form of a horizontally long tape, and the other is an intermediate layer 24 in the form of a horizontally long tape. These three layers are laminated and integrated in such a manner that an intermediate layer 24 is interposed between the low adhesion layer 22 and the high adhesion layer 23. About each layer of the sealing body 21, the thickness per layer is about 100-200 micrometers as an example. In this case, the total thickness of the sealing body 21 having a three-layer structure is about 300 to 800 μm. In some cases, there is also a sealing body 21 in which the total thickness of each layer is less than 300 μm, and there is also a sealing body 21 in which the total thickness of each layer exceeds 800 μm. In general, the sealing body 21 having a laminated structure made of synthetic resin is produced by any one of an extrusion laminating method, a dry laminating method, a coextrusion method, a laminating method other than these methods, or a combination of these methods. Is. Such laminating methods include hot melt laminating, coating polylaminating, wet laminating, thermal laminating and the like. Further, in the case of the sealing body 21 made of a combination of a non-synthetic resin material and a synthetic resin material, for example, a synthetic resin material layer is bonded or formed on the surface of the non-synthetic resin material layer. Thus, the laminated structure 21 is produced.

  Regarding the sealing body 21 made of the synthetic resin composed of the low adhesive layer 22, the high adhesive layer 23, and the intermediate layer 24, the material of each layer will be described in detail below.

  The low adhesion layer 22 is a main factor that determines the easy peelability (weak adhesion) of the sealing body 21. When the low adhesive layer 22 of the sealing body 21 is made of synthetic resin and the inner surface side of one film (12 or 13) corresponding to weak adhesion is also made of synthetic resin, the synthetic resin film (12 or 13) The low-adhesion layer 22 made of synthetic resin to the inner surface of () is bonded so as to be any one of these peeling types such as an interlayer peeling type, a cohesive peeling type, and an interface peeling type. More specifically, the low adhesion layer 22 is bonded to the other side by a room temperature pressure bonding means (pressure bonding means) or a heat welding means (pressure heat welding means). The low adhesion layer 22 bonded to the inner surface of the synthetic resin film (12 or 13) by the room temperature pressure bonding means is made of a synthetic resin and made of an adhesive-based adhesive material as a representative example. In the case of the low adhesion layer 22 adhered to the inner surface of the synthetic resin film (12 or 13) by means of heat welding, it consists mainly of a blend polymer in which a plurality of different polymers are blended. In the case of the latter low adhesion layer 22, the combination of polymers to be blended (different polymer blends), the blending ratio of each polymer, etc., depending on which peeling type such as delamination type, cohesive peeling type, interface peeling type, etc. It will be set and required. Further, in the case of the latter low adhesive layer 22, the adhesive strength (easy peelability) with the other side includes the same kind of polymer as the synthetic resin film (12 or 13), in other words, the film It is determined how much the polymer is different from (12 or 13). Furthermore, in the case of the latter low adhesion layer 22, the easy peelability after the thermal welding can be changed variously by adjusting the temperature, the pressing force, the pressurizing time, etc. when thermally welding with the synthetic resin film. Can do. Thus, since the latter low adhesive layer 22 has many parameters that determine its easy peelability (weak adhesiveness), the easy peelability is set based on part or all of the parameters. From the viewpoint of different types of polymer blends, two different types of synthetic resin components or three or more different types of synthetic resin components from among the various types of thermoplastic synthetic resins listed in both films 12 and 13 are used. Consists of things. Specific examples of the low-adhesion layer 22 include a mixture of a polyethylene resin and a polypropylene resin in an appropriate ratio, a polyethylene resin, a polypropylene resin, and an ethylene vinyl acetate copolymer resin. Of course, the low adhesive layer 22 is not limited to this example, and two or more types of resin are selected from the thermoplastic synthetic resins described above. To be blended.

  The main role of the high adhesion layer 23 in the seal body 21 is to reliably and stably fix the seal body 21 to the film to be bonded. Accordingly, the material of the high adhesion layer 23 is strongly bonded to any of the above-mentioned films (12 or 13) corresponding to the high adhesion layer 23, or is completely bonded and integrated. It is desirable. By the way, if the high adhesion layer 23 is made of the same synthetic resin as the film (12 or 13) to be bonded, the high adhesion layer 23 and the film (12 or 13) are bonded by the above-mentioned heat welding means. Both of these are bonded and integrated almost completely. For this reason, the same thermoplastic synthetic resin as the material (12 or 13) to be cut is used as the material for the high adhesion layer 23. Since the specific thermoplastic synthetic resin in that case is the same as that described in the material description of both films 12 and 13, the description thereof will be omitted by referring to it.

  The main role of the intermediate layer 24 in the seal body 21 is to adjust the physical properties, particularly mechanical and chemical characteristics of the seal body 21 including flexibility, elasticity, rigidity, strength, heat resistance, processing stability, and others. It is. As for the material of the intermediate layer 24, when the low adhesion layer 22 and the high adhesion layer 23 are made of a thermoplastic synthetic resin, a thermoplastic synthetic resin is used. What is used as a material of the intermediate layer 24 is also adopted from those listed as the material description of both films 12 and 13. Some specific examples are thermoplastic synthetic resins such as polyethylene terephthalate and polyimide. The intermediate layer 24 interposed between the low adhesive layer 22 and the high adhesive layer 23 may be a single layer or multiple layers. However, when the number of layers is excessively increased, not only the cost is increased, but undesirable bulkiness / strengthening is caused at the level of the seal body 21. Therefore, the number of intermediate layers 24 may be about 1-2.

  The laminated sealing body 21 may be a tape-like structure formed by any means such as bonding, coating, co-extrusion, etc., whether it is a two-layer laminated structure or a laminated structure of three or more layers. It is what is doing. When the sealing body 21 thus produced has a two-layer structure of the low adhesive layer 22 and the high adhesive layer 23, the low adhesive layer 22 and the high adhesive layer 23 are strongly bonded even if they are weakly bonded. It may be a thing. Further, when the sealing body 21 has a multilayer structure (laminated structure of three or more layers) composed of the low adhesive layer 22, the high adhesive layer 23, and the intermediate layer 24, the low adhesive layer 22 and the intermediate layer 24 are weakly bonded. Even if it exists, it may be strongly bonded. In the case of the sealing body 21 having a tape shape with a laminated structure, one surface (layer surface) of the low adhesive layer 22 is exposed on one tape surface, and one surface (layer) of the high adhesive layer 23 is exposed on the other tape surface. Surface) is exposed. The respective parts of the low adhesive layer 22 and the high adhesive layer 23 in the sealing body 21 are integrally formed, but these are divided as follows and functionally according to their roles. It can be used properly.

  In the embodiment of FIGS. 1A and 1B, a horizontally elongated non-adhesive band portion extending between both side portions in the bag body 11 is integrally formed at the lower layer surface of the high adhesion layer 23. The non-adhesive band portion below the surface of the high adhesion layer 23 corresponds to a free portion 23c described later. Further, in the case of the upper layer surface of the low adhesive layer 22, the lower layer surface of the low adhesive layer 22, and the upper layer surface of the high adhesive layer 23, one or more parts selected from these are disposed on both sides of the bag body. A horizontally long strip-shaped non-adhesive strip portion is integrally formed. In this regard, in the example of FIGS. 1A and 1B, there is a non-adhesive band portion 22b at the upper layer surface of the low adhesive layer 22, and a non-adhesive band portion 22c at the lower layer surface of the low adhesive layer 22. There is a non-adhesive band portion 23 b on the upper surface of the adhesive layer 23. The portions excluding these portions become the adhesive band portions 22a and 23a of the low adhesive layer 22 and the high adhesive layer 23. Here, when the surface areas of the low adhesive layer 22 and the high adhesive layer 23 are constant, the peel strength of the low adhesive layer 22 and the high adhesive layer 23 with respect to the inner surfaces of both films 12 and 13 is determined by the non-adhesive band portions 22b, 22c, It is determined by the size (surface area) of 23b. Further, the peel strength of the low adhesive layer 22 and the high adhesive layer 23 varies depending on how many non-adhesive band portions (22b, 22c, 23b) of this type are present in the seal body 21. Furthermore, the magnitude | size of the initial load required at the time of peeling of the low-adhesion layer 22 changes with which site | parts the boundary line of a non-adhesive belt part (22b and / or 22c) and the adhesive belt part 22a exists. In consideration of such matters, the surfaces of the non-adhesive band portions 22b, 22c, and 23b in the low adhesive layer 22 and the high adhesive layer 23 can be referred to as non-adhesive surfaces for setting the peel strength. The non-adhesive surface for setting the peel strength of the non-adhesive band portions 22b, 22c, and 23b is set to an arbitrary size (surface area). As a specific example, the size of the surface area of the non-adhesive band portions 22b, 22c, and 23b can be determined by setting the vertical dimension to various sizes. In this regard, when the sealing body 21 includes any one or two of the non-adhesive band portions 22b, 22c, and 23b, the other non-adhesive band portions are set to [vertical dimension = 0]. Is done. In other words, there is an example in which any one or two of the non-adhesive band portions 22b, 22c, and 23b are omitted. Thus, in the sealing body 21 when the non-adhesive band portion is omitted, the area of the adhesive band portion is relatively increased by the omitted amount. In the case of the free portion 23c, the vertical dimension is adjusted as in the case of the non-adhesive band portions 22b, 22c, and 23b.

When the vertical dimension of each non-adhesive band portion including the free portion is conceptually expressed by a mathematical formula, the following formulas (1) to (4) are obtained. The unit of each following formula is [m] in an example. However, the seal body 21 does not take an option such that the non-adhesive band portions 22b, 22c, and 23b are all [0].
[1 ≦ (non-adhesive band portion 22b)] or [1> (non-adhesive band portion 22b) ≧ 0] (1)
[1 ≦ (non-adhesive band portion 22c)] or [1> (non-adhesive band portion 22b) ≧ 0] (2)
[1 ≦ (non-adhesive band portion 23b)] or [1> (non-adhesive band portion 22b) ≧ 0] (3)
[0 ≦ (free part 23c)] (4)

  In the embodiment shown in FIGS. 1A and 1B, the seal body 21 is interposed on the opening 14 side in the bag body 11 and is relatively bonded to the inner surfaces of both the films 12 and 13 so as to have the bag body 11. It is provided inside. More specifically, the low adhesive layer 22 of the seal body 21 is weakly bonded to the inner surface of the film 12 via the adhesive band portion 22a, and the high adhesive layer 23 of the seal body 21 is bonded to the adhesive band portion 23a. It is weakly bonded to the inner surface of the other film 13 via On the other hand, the non-adhesive band portions 22b and 22c of the low adhesive layer 22 are not bonded to the inner surface of the one film 12, and the non-adhesive band portion 23b and the free portion 23c of the high adhesive layer 23 are also connected to the inner surface of the other film 13. And non-adhesive.

As is apparent with reference to FIG. 1B, both surfaces of the sealing body 21 corresponding to both films 12 and 13 with partial adhesion and non-adhesion of the remainder, that is, the layer surface of the low adhesion layer 22 or high adhesion. On the surface of the layer 23, symbols indicating the vertical dimension (vertical width) of the adhesive band portion 22a, the non-adhesive band portions 22b and 22c, the adhesive band portion 23a, the non-adhesive band portion 23b, the free portion 23c, and the like are attached. Has been. The upper and lower widths are [S11] for the adhesive band 22a, [S12] for the non-adhesive band 22b, [S13] for the non-adhesive band 22c, and [S21] for the adhesive band 23a. The adhesive band portion 23b is [S22], and the free portion 23c is [S23]. About the aspect of each part of a sealing body on the basis of this up-and-down width, there exist the following as shown by the equality and inequality using dimension symbols S11-S13, S21-S23.
[Regarding S11 to S13]
S11 ≧ S12 ≧ S13, S11>S13> S12, S12>S11> S13, S12>S13> S11, S13>S11> S12, S13>S12> S11
[Regarding (S11) and (S12 + S13)]
(S11) ≧ (S12 + S13), (S12 + S13)> (S11)
[Regarding S21 to S23]
S21 ≧ S12 ≧ S13, S21>S23> S22, S22>S21> S23, S22>S23> S21, S23>S21> S22, S23>S22> S21
[Regarding (S21) and (S22 + S23)]
(S21) ≧ (S22 + S23), (S22 + S23)> (S21)
[Regarding S11 to S13 and S21 to S23]
S11 = S12 = S13 = S21 = S22 = S23
The number of permutations [nPr] in which r pieces are extracted from n different pieces and arranged in a line can be obtained by the well-known formula (5) below.
[NPr] = n [n-1] [n-2] (n-r + 1) (5)
Therefore, based on (six) of S11 to S13 and S21 to S23, and for the number of different inequalities, [6] is substituted for n in the above formula (5) and [ 6] is substituted to calculate “720”. These 720 inequalities are self-evident that can be derived from the above formula (5), so only a part of them will be listed below, but S11, S12, S13, S21, S22, and S23 in the present invention. Regarding the dimension setting, there are 720 modes in which any one of them is set to the maximum value, the intermediate value, and the minimum value.
S11>S12>S13>S21>S22> S23,
S12>S11>S13>S21>S22> S23,
S13>S11>S12>S21>S22> S23,
S21>S22>S23>S11>S12> S13,
S22>S21>S23>S11>S12> S13,
S23>S21>S22>S21>S22> S23
[Regarding (S11), (S12 + S13), (S21), and (S22 + S23)]
(S11)> (S12 + S13)>(S21)> (S22 + S23),
(S11)> (S12 + S13)>(S21)> (S22 + S23),
(S11)>(S21)> (S12 + S13)> (S22 + S23),
(S11)>(S21)> (S22 + S23)> (S12 + S13),
(S11)> (S22 + S23)> (S12 + S13)> (S21),
(S11)> (S22 + S23)>(S21)> (S12 + S13),
(S12 + S13)>(S11)>(S21)> (S22 + S23),
(S12 + S13)>(S11)> (S22 + S23)> (S21),
(S12 + S13)>(S21)>(S11)> (S22 + S23),
(S12 + S13)>(S21)> (S22 + S23)> (S11),
(S12 + S13)> (S22 + S23)>(S11)> (S21),
(S12 + S13)> (S22 + S23)>(S21)> (S11),
(S21)>(S11)> (S12 + S13)> (S22 + S23),
(S21)>(S11)> (S22 + S23)> (S12 + S13),
(S21)> (S12 + S13)>(S11)> (S22 + S23),
(S21)> (S12 + S13)> (S22 + S23)> (S11),
(S21)> (S22 + S23)>(S11)> (S12 + S13),
(S21)> (S22 + S23)> (S12 + S13)> (S11),
(S22 + S23)>(S11)> (S12 + S13)> (S21),
(S22 + S23)>(S11)>(S21)> (S12 + S13),
(S22 + S23)> (S12 + S13)>(S11)> (S21),
(S22 + S23)> (S12 + S13)>(S21)> (S11),
(S22 + S23)>(S21)>(S11)> (S12 + S13),
(S22 + S23)>(S21)> (S12 + S13)> (S11)

  As described above, the free portion 23c of the seal body 21 is indispensable, but the non-adhesive band portions 22b, 22c, and 23b of the seal body 21 include all examples as described above. There is an example in which only one of these is provided, or any two of them are provided. In this case, as in the latter case, an example having only one of the non-adhesive band portions 22b, 22c, and 23b or an example having either two of the non-adhesive band portions 22b, 22c, and 23b In this case as well, the vertical widths S11 to S13 and S21 to S23 of the non-adhesive strip are set as in the above-described equations and inequalities. However, in the case of an example having one non-adhesive band or an example having two non-adhesive bands, there are S11, S13, S21, S22, etc. that do not fall within the above equation or the above inequality. It becomes. In such a case, S11, S13, S21, S22, etc. that are not applicable may be regarded as not described, and the above equations and inequalities may be handled. Of course, in this case as well, each inequality etc., without referring to the above, obtain a new permutation according to the above formula (5), and refer to the obtained order to determine the rank order of the adhesive band part and the non-adhesive band part. You may decide.

  In the case of the easy-open packaging bag according to the present invention, the relative position between the upper side of the low adhesive layer and the upper side of the high adhesive layer in the bag height direction, and the relative position of the lower side of the low adhesive layer and the lower side of the high adhesive layer are illustrated. Regardless of the presence or absence, the embodiment is configured to satisfy the following conditions. As one of them, regarding the upper side of the low adhesive layer 22 and the upper side of the high adhesive layer 23, the condition that the heights of both the upper sides in the bag height direction are equal to each other and the heights of the both upper sides are different from each other. Any one of the conditions is satisfied. As another one, regarding the lower side of the low adhesive layer 22 and the lower side of the high adhesive layer 23 in the bag height direction, the conditions that the heights of the two lower sides are equal to each other and the heights of the two lower sides are different from each other. Any one of the conditions is satisfied.

  Regarding the sealing body 21, the adhesive band portion 22 a of the low adhesive layer 22 that is weakly bonded to the inner surface of one film 12 has easy peelability. On the other hand, the adhesive band portion 23a of the high adhesion layer 23 that is strongly adhered to the inner surface of the other film 13 is hardly peelable. Of course, the easily peelable adhesive strength (adhesive strength of the adhesive band portion 22a) in this case is lower than the hardly peelable adhesive strength (adhesive strength of the adhesive band portion 22a). These adhesive strengths vary depending on packaging conditions and applications, and are arbitrarily set according to the demand. In a specific example in that case, the easy-peeling adhesive strength is set within a range of about 300 to 1500 g / 15 mm, and the hard-peeling adhesive strength is set within a range of about 2000 to 4000 g / 15 mm. The

  In the embodiment shown in FIGS. 1A and 1B, a known opening / closing tool 31 is provided at a position higher than the seal body 21 on the opening 14 side in the bag body 11. Such an opening / closing tool 31 is generally called by a name such as a chuck, a zipper, or a fastener, and includes a pair of male and female members. In the example of FIGS. 1A and 1B, the opening / closing tool 31 includes a female opening / closing member 31a and a male opening / closing member 31b that can be engaged with each other. The opening / closing tool 31 is not limited to this, and may be a hook-and-loop fastener type, for example. 1 (A) and 1 (B), the female opening / closing member 31a and the male opening / closing member 31b are made of synthetic resin (made of plastic), and the thermoplastic synthetic resin as described in both films 12 and 13 is used. Often made. The female opening / closing member 31a and the male opening / closing member 31b of the opening / closing tool 31 are also, for example, a room temperature pressure bonding means (pressure bonding means) or a heat welding means (pressure heating welding means) to the inner surfaces of the films 12 and 13. It is glued with.

  In the case of the easy open type packaging bag according to the present invention illustrated in FIGS. 1 (A) and 1 (B), as will be obvious, the contents (packaged material) are taken out from the opening 14 of the bag body 11. It is. When the opening 14 side of the bag 11 is opened in order to take out the contents, as is obvious, the closed state (occlusion state) of the opening / closing tool 31 is released and the male and female members 31a and 31b are disengaged. At the same time, the sealed state by the seal body 21 is also released.

  Regarding the seal release operation of the seal body 21 in the above, it grasps the upper end central portion of the bag front film 12 and the bag back film 13 on the opening 14 side of the bag body 11, and each of them is shown in FIG. Just pull away in the left-right direction. As described above, with respect to the seal body 21 to be released, the adhesive force (low adhesion side) of the low adhesive layer 22 to the one film 12 is lower than the adhesive force (strong adhesion side) of the high adhesive layer 23 to the other film 13. Is. Moreover, in the case of the strong adhesion side (film 13: high adhesion layer 23), it does not peel and break with the seal release force applied by the user, but in the case of the weak adhesion side (film 12: low adhesion layer 22), Since it is weakly bonded, it peels and breaks with this seal release force. Furthermore, this is because any one of delamination, cohesive delamination, and interfacial delamination occurs between the film 12 on the weak adhesion side and the low adhesion layer 22 and the two 12 and 22 are separated.

  About the packaging bag which concerns on embodiment of FIG. 1 (A) (B), the following can be said about cancellation | release of a seal | sticker. In the embodiment, there is a non-adhesive band portion 22 b on the upper surface of the low adhesion layer 22, and the non-adhesive band portion 22 b is released from the inner surface of the film 12. In such a case, the upper end portion of the low adhesive layer 22 and the film 12 spread without difficulty due to the peeling force when the seal is released, and the peeling force smoothly spreads there, so that the seal can be easily released. become. In other words, the initial load at the time of release of the seal by the user can be small, and thereby the easy peelability when opening the opening 14 of the bag body 11 is further increased. About the easy peelability from this bag upper part side, the up-and-down width S12 of the non-adhesion belt | band | zone part 22b is larger, and the up-and-down width S11 of the bonding band part 22a shows the tendency to increase.

  When a packaged bag (unopened) is boiled together with a packaging bag or heated in a microwave oven, as is well known, the packaging bag expands by heating at that time. With reference to the packaging bag shown in FIGS. 1A and 1B, the upper space portion 17 between the seal body 21 and the opening / closing tool 31 in the bag body 11 and the accommodation space portion 18 below the seal body 21. Expands thermally. The internal pressure accompanying this thermal expansion causes the opening / closing tool 31 to open naturally depending on the magnitude of the pressure, or causes the seal state to be broken by the seal body 21. However, for the packaging bags of FIGS. 1A and 1B, it can be said that the seal breakage of the seal body 21 due to the pressure inside the bag is unlikely to occur. The reason will be described below.

  When the upper space portion 17 and the accommodation space portion 18 of the bag body 11 are thermally expanded, the bag surface film 12 and the bag back film 13 at the location receive the bag internal pressure and project in the left-right direction in FIG. It will be. This left-right force caused by the bag internal pressure acts as a force for peeling the low adhesive layer 22 of the seal body 21 from the inner surface of the film 12. On the other hand, since the pressure inside the bag also acts in the vertical direction of FIG. 1B, the seal body 21 receives a downward force from the upper surface side in the upper space portion 17, or in the accommodating space portion 18. In addition, it receives an upward force from the lower surface side. Regarding the peel resistance of the sealing body 21 that is weakly bonded to the inner surface of the film 12, especially the peel resistance of the low adhesive layer 22, when the former (left-right peel force) and the latter (vertical peel force) In contrast, it can be said that the peel resistance is low with respect to the former peel force and the peel resistance is high with respect to the latter peel force. The reason why the peeling resistance of the low adhesive layer 22 is low with respect to the peeling force in the left-right direction in FIG. 1B is that a tensile stress that tears both the film 12 and the low adhesive layer 22 from the interface acts. . The reason why the peeling resistance of the low adhesive layer 22 is high with respect to the peeling force in the vertical direction in FIG. 1B is that the force in this direction acts as a shearing stress along the vertical direction on the inner surface of the film 12. Of course, in practical use, the low adhesion layer 22 is hardly displaced or peeled off by this kind of shear stress.

  As is apparent from the above, the internal pressure of the upper space portion 17 and the accommodating space portion 18 does not act on the seal body 21 only in one direction, but for example, each direction such as the left-right direction and the up-down direction in FIG. Acts in a distributed manner. This is because the internal pressure of the upper space portion 17 and the internal pressure of the accommodation space portion 18 are dispersed in each direction without being concentrated only in the left-right direction in FIG. The situation of concentrating on can be avoided. As a result, the low-adhesion layer 22 when the internal pressure is generated exhibits appropriate peeling resistance while well withstanding the internal pressure. 1 (A) and 1 (B), the upper and lower ends of the seal body 21 in the bag body 11 have non-adhesive band portions 22b and 22c and non-adhesive band portions 23b on both sides. Since the portion 23c is provided, it is easy to move like a flap (movable wing) and bend easily compared to the entire surface of both sides of the seal body 21. The ease of movement and the ease of bending are the same when the generated internal pressure fluctuates or the shapes of the space portions 17 and 18 change. Since the upper and lower end portions of the sealing body 21 having dynamic degrees of freedom and bending degrees of freedom at both the upper and lower ends change within the range of the degrees of freedom, the tensile load in the left and right direction shown in FIG. On the other hand, the shearing load in the vertical direction in FIG. With such a sealing body 21, it can be said that the peeling resistance when the internal pressure is generated is sufficient.

  The low adhesive layer 22 of the sealing body 21 in the packaging bag of FIGS. 1A and 1B exhibits the above effective peeling resistance in cooperation with the high adhesive layer 23 when the bag internal pressure is generated. . The low adhesive layer 22 not only reduces the adhesion area of the adhesive band 22a to the film due to the presence of the non-adhesive bands 22b and 22c, but also actively and intensively through the user. Since the initial peeling load when receiving the seal release force is reduced by the non-adhesive band portion 22b and the final peeling load is also reduced by the non-adhesive band portion 22c, the ease of opening from the bag opening side is generally improved. It will be.

  The sealing body 21 provided in the bag body 11 has the above-mentioned non-adhesive band portions 22b and 22c, non-adhesive band portions 23b and free portions 23c on both sides, and the free portion 23c is indispensable. . Further, regarding the non-adhesive band portions 22b and 22c and the non-adhesive band portion 23b, it is indispensable to have at least one of them, but any one of them, any two, or all three May be included. In such a sealing body 21, for example, when the non-adhesive band portion 22 b is on the upper end side of the low adhesive layer 22 b and the non-adhesive band portion 23 b is on the upper end side of the high adhesive layer 23, the non-adhesive band portion It is desirable that the vertical width of 22b is smaller than the vertical width of the non-adhesive band portion 23b. In other words, the upper end of the adhesive band portion 22a is lower than the upper end of the adhesive band portion 23a. In other words, the dimension from the upper end of the bag body 11 to the upper end of the adhesive band portion 22a is the bag body. 11 is preferably smaller than the dimension from the upper end of 11 to the upper end of the adhesive band portion 23a. The reason is that the above-described shear stress is likely to be generated in the low adhesive layer 22b when the internal pressure of the upper space portion 17 is increased, and seal breakage due to the internal pressure is unlikely to occur. Such a matter can also be said when there is a non-adhesive band portion 22c on the lower end side of the low adhesive layer 22b and a free portion 23c on the lower end side of the high adhesive layer 23. That is, it is desirable that the vertical width of the non-adhesive band portion 22c is smaller than the vertical width of the free portion 23c. In other words, the lower end of the adhesive band portion 22c is located higher than the lower end of the free portion 23c. In other words, the dimension from the inner bottom of the bag body 11 to the lower end of the adhesive band portion 22a is the bag body. 11 is preferably smaller than the dimension from the inner bottom of 11 to the lower end of the adhesive band portion 23a.

  Various seal patterns based on the above-described contents, that is, various seal patterns in the bag body 11 via the seal body 21 are as shown in FIGS. Among these, the seal pattern in the bag body 11 illustrated in FIG. 2A is the same as that described in FIG. In the seal pattern in the bag body 11 illustrated in FIG. 2B, the non-adhesive band portion 22c is omitted in FIG. 2A, and the omitted portion is replaced as a part of the adhesive band portion 22a. It has been done. In the seal pattern in the bag body 11 illustrated in FIG. 2C, the non-adhesive band portion 22b is omitted in FIG. 2A, and the omitted portion is replaced as a part of the adhesive band portion 22a. It has been done. The seal pattern illustrated in FIG. 2D is obtained by omitting the non-adhesive band portion 23b in FIG. 2A and replacing the omitted portion as a part of the adhesive band portion 23a. Further, the seal pattern illustrated in FIG. 2 (E) has the two non-adhesive band portions 22b and 23b omitted in the one shown in FIG. 2 (A), of which the omitted portion of the non-adhesive band portion 22b is bonded. In addition to being replaced as a part of the band part 22a, the omitted part of the non-adhesive band part 22b is replaced as a part of the adhesive band part 23a. Further, in the seal pattern illustrated in FIG. 2 (F), the two non-adhesive band portions 22b and 22c are omitted in FIG. 2 (A), and the omitted portion is replaced as a part of the adhesive band portion 22a. It is what. In the seal pattern of FIG. 2F, the non-adhesive band portion is omitted only on the low adhesive layer 22 side, and the non-adhesive band portion is not omitted on the high adhesive layer 21 side.

  FIGS. 3A to 3F show various seals in the case where a seal body 21 for sealing the inside of the bag body 11 having two layers of a low adhesion layer 22 and a high adhesion layer 23 is used. It shows a pattern. 3 is substantially the same as that described with reference to FIGS. 2A to 2F except for the difference in the number of layers of the seal body 21. Therefore, each seal pattern of FIG. 3 is omitted by referring to the description of FIG. As another example, there is also a sealing body 21 in which a plurality (eg, two layers) of intermediate layers 24 are interposed between the low adhesive layer 22 and the high adhesive layer 23. Even when such a multilayer structure (four or more layers) is used as the seal body 21 for sealing the inside of the bag body 11, the seal patterns in the bag body 11 are shown in FIGS. (F) and the contents described with reference to FIGS. 3 (A) to 3 (F) are substantially the same as or equivalent to those described above.

  Even in the case of each bag body 11 having the bag inner seal pattern described with reference to FIGS. 2 (B) to 2 (F) and FIGS. 3 (A) to 3 (F), of course. The vertical widths S11 to S13 and S21 to S23 of the adhesive band portion 22a, the non-adhesive band portion 22b and 22c, the adhesive band portion 23a, the non-adhesive band portion 23b, the free portion 23c, etc. are shown in FIGS. As described in the above embodiment, the difference in size can be set in various manners.

The seal pattern applied to the inside of the bag body 11 is not limited to the above-described examples, and can be embodied by various seal bodies 21 described below. Hereinafter, an example of which the seal member 21 with reference to FIGS.

  4 (A) and 4 (B), the low-adhesion layer 22 and the high-adhesion layer 23 (including the intermediate layer 24) are laminated and integrated with a vertical shift. Among these, in FIG. 2A, the upper end of the low adhesive layer 22 is higher than the upper end of the high adhesive layer 23, and the lower end of the high adhesive layer 23 is lower than the lower end of the low adhesive layer 22. The thing of the figure (B) is the reverse of the thing of the figure (A). 4 (C) to 4 (F), one of the low-adhesion layer 22 and the high-adhesion layer 23 (including the intermediate layer 24) has a vertical width larger than the other. It is. More specifically, in FIG. 2C, the vertical width of the low adhesive layer 22 is smaller than the vertical width of the high adhesive layer 23 and the upper and lower ends of the high adhesive layer 23 are higher than the upper and lower ends of the low adhesive layer 22. Each protrudes up and down. In the figure (D), the vertical width of the high adhesive layer 23 is smaller than the vertical width of the low adhesive layer 22, and the upper and lower ends of the low adhesive layer 22 protrude vertically from the upper and lower ends of the high adhesive layer 23. It is what. In FIG. 5E, the vertical width of the high adhesive layer 23 is smaller than the vertical width of the low adhesive layer 22, and the lower end of the low adhesive layer 22 is coincident with the lower end of the high adhesive layer 23. is there. In FIG. 8F, the vertical width of the low adhesive layer 22 is smaller than the vertical width of the high adhesive layer 23, and the upper end of the low adhesive layer 22 coincides with the upper end of the high adhesive layer 23. is there. In the case of each sealing body 21 illustrated in FIGS. 4A to 4F, non-adhesive band portions 25 x and 25 y are generated at locations facing the inner surfaces of both films 12 and 13 by adopting such an embodiment. . In the case of each sealing body 21 illustrated in FIGS. 4 (A) to 4 (F), it is applied to the inner seal of the bag body 11 with contents substantially the same as or equivalent to the contents explained so far. It is.

  Each seal body 21 illustrated in FIGS. 5A to 5F is the same as each seal body 21 in FIGS. 4A to 4F except that the intermediate layer 24 is omitted. It is. Therefore, about each sealing body 21 illustrated to FIG. 5 (A)-(F), these description is abbreviate | omitted by referring the description matter in the said FIG. In the case of each sealing body 21 illustrated in FIGS. 5 (A) to 5 (F), the sealing body 21 is applied to the inner seal of the bag body 11 with substantially the same content as described above or according to the content. It is.

  In addition to this, in any of the sealing bodies 21 exemplified so far, a non-bonded free portion may be set at the upper end portion and / or the lower end portion of the lamination interface in each of the layers 22, 23, and 24. In this case, in the case of the three-layer structure sealing body 21, the layers 22, 23, and 24 are separated from each other on the upper end side of the sealing body 21 as shown in FIG. The layers 22, 23, and 24 are separated from each other as shown in FIG. 6B, and in the case of the two-layer structure sealing body 21, the layers 22, 23 are arranged on the upper end side of the sealing body 21. The layers 22 and 23 are separated from each other as shown in FIG. 6D, or the layers 22 and 23 are separated from each other as shown in FIG. 6D. Furthermore, as a modification of FIGS. 6A and 6B relating to the sealing body 21, the upper end portions of the low adhesive layer 22 and the intermediate layer 24 are bonded, the low adhesive layer 22 and the intermediate layer 24. The lower end is bonded, the upper ends of the high adhesive layer 23 and the intermediate layer 24 are bonded, the lower ends of the high adhesive layer 23 and the intermediate layer 24 are bonded, and so on. There are also embodiments that satisfy one or more of these.

  Further, in any of the sealing bodies 21 exemplified so far, the non-adhesive band portion (a belt-like shape extending over both end portions of the sealing body 21) is provided in a place different from the above-described part due to the relationship between the films 12 and 13. Things) may be set. As one mode, as shown in FIG. 6E, the non-adhesive band portion 22d that is non-adhered to the inner surface of the film 12 is set on the low adhesive layer 22 side of the seal body 21. As another embodiment, as shown in FIG. 6 (F), the non-adhesive band portion 23d that is non-adhered to the inner surface of the other film 13 is set on the high adhesive layer 23 side of the seal body 21. It is. In a typical example, the non-adhesive band portions 22d and 23d have a horizontally long band shape extending over both sides of the low adhesive layer 22 and the high adhesive layer 23. Of course, also in the case of the non-adhesive band portions 22d and 23d, there is a freedom of selection that only one of them is set or both of them are set. Further, in the case of the non-adhesive band portions 22d and 23d, a plurality of parallel ones may be set on the low adhesive layer 22 side and / or the high adhesive layer 23 side. Since this type of non-adhesive band portions 22d and 23d is provided at the upper and lower intermediate portions between the upper end portion and the lower end portion of the surface of the low adhesive layer 22 or the high adhesive layer 23, the intermediate It can be called an adhesive band.

  As for the easy open type packaging bag according to the present invention, a bag other than those illustrated in FIGS. 1A and 1B is used. There are various embodiments based on the number and location of tools 31. This will be described below with reference to FIG.

  In the example illustrated in FIG. 7A, only one seal body 21 is provided in the bag body 11. In the example illustrated in FIG. 7B, each one sealing body 21 and opening / closing tool 31 provided in the bag body 11 seal from the top to the bottom (from the opening 14 side to the bag bottom side). The body 21 is arranged in the order of the opening / closing tool 31. In the example illustrated in FIG. 7C, two seal bodies 21 and one opening / closing tool 31 provided in the bag body 11 are sealed from the top to the bottom of the sealing body 21 → the opening / closing tool 31 → the sealing body. They are arranged in the order of 21. In the example illustrated in FIG. 7D, one seal body 21 and two opening / closing tools 31 provided in the bag body 11 are formed by opening / closing tools 31 → sealing body 21 → opening / closing tool from top to bottom. They are arranged in the order of 31. In the case of the example illustrated in FIG. 7E, the two sealing bodies 21 and the one opening / closing tool 31 provided in the bag body 11 are open / closed tools 31 → the sealing body 21 → the seal from the top to the bottom. They are arranged in the order of the body 21. In the case of the example illustrated in FIG. 7F, the two sealing bodies 21 and the one opening / closing tool 31 provided in the bag body 11 are sealed from the top to the bottom, the sealing body 21 → the sealing body 21 → the opening / closing. They are arranged in the order of the tools 31. In the case of the example illustrated in FIG. 7G, one seal body 21 and two opening / closing tools 31 provided in the bag body 11 are sealed body 21 → opening / closing tool 31 → opening / closing from the top to the bottom. They are arranged in the order of the tools 31. Further, in the example illustrated in FIG. 7 (H), one seal body 21 and two opening / closing tools 31 provided in the bag body 11 are formed by opening / closing tools 31 → opening / closing tools 31 → seal from the top to the bottom. They are arranged in the order of the body 21.

  In the packaging bags illustrated in FIGS. 7A to 7H, any of the seal bodies 21 and the opening / closing tools 31 provided in the bag body 11 may be used. It is. Therefore, in the case of each packaging bag illustrated in FIG. 7, the seal body 21 and the opening / closing tool 31 selected from those already described are used. However, some of the seal bodies 21 may be used as described later with reference to FIG.

  Of the packaging bags of the present invention according to the embodiment of FIG. 7, the total number of the sealing bodies 21 and the opening / closing tools 31 is [3], as is obvious, the total number is less than [2] or less. Demonstrate advanced sealing function. Therefore, such a packaging bag is suitable for an application that requires a high sealing function. Furthermore, in the embodiment of FIG. 7, in the case of a packaging bag in which the total number of the sealing bodies 21 and the opening / closing tools 31 is [3], between the sealing body 21 and the opening / closing tool 31 adjacent vertically, A space portion similar to the upper space portion 17 is interposed between two seal bodies 21 adjacent vertically and between two opening / closing tools 31 adjacent vertically. Since the number is [2], the number is doubled as compared with those in FIGS. Such a space part contributes to alleviating the influence of expansion and contraction in the bag caused by temperature changes, particularly the influence of thermal expansion. One reason is that the heat capacity increases. Another reason is that, for example, each time the seal body 21 and the opening / closing tool 31 are opened sequentially from the bottom to the top, the volume of the accommodation space 18 is gradually increased and the pressure per unit volume is reduced. Therefore, it is difficult for an unintentional situation such as content to blow out from the opening due to a pressure change. Those having a total number [3] of the sealing bodies 21 and the opening / closing tools 31 are also suitable for large packaging bags having a large storage capacity (filling capacity), such as bags that may generate a large internal pressure.

  In the embodiment such as FIGS. 7C, 7 </ b> E, and 7 </ b> F, two seal bodies 21 are provided in the bag body 11. Thus, in the case of the bag body 21 having two seal bodies 21, the lower surface of the high adhesion layer 23, which is the free portion 23 c in the previous example, is adhered to the inner surface of the film 13. It doesn't matter. That is, for one of the two sealing bodies 21, the lower layer surface may be bonded to the inner surface of the film 13 as shown.

  Next, an embodiment of the method for sealing inside a packaging bag according to the present invention will be described with reference to FIGS.

  As for one embodiment of the sealing treatment method of the present invention, it is that both films are supplied by rewinding and supplying the bag front film 12 and the bag back film 13 in a predetermined direction from two independent roll-shaped film originals. 12 and 13 and the sealing body 21 interposed between them are relatively bonded, and thus the inside of the packaging bag is sealed. At this time, the films 12 and 13 are intermittently fed in the traveling direction, and the seal body 21 is also interposed between the films 12 and 13 in synchronization with the intermittent motion at this time. Furthermore, each means provided on the line for the sealing process and others performs a required operation while being linked to each other and taking timing. An outline of the processing line based on this is merely an example and is shown in the block diagram of FIG. The flow of the line in FIG. 8 is as follows. [1] The bag-backing film 13 is rewound and supplied in a predetermined direction from the roll-shaped film original. [2] The sealing body 21 is supplied onto the film 13, that is, the inner surface of the film 13 from a direction orthogonal to the line flow. Of course, in this case, the sealing body 21 supplied on the film 13 has finished selecting the type such as the two-layer type or the three-layer type, and how to adhere this to the both films 12 and 13 Is already decided. [3] The bag surface film 12 is fed back in a predetermined direction from the roll-shaped film original and overlapped on the film 13. [4] One side edge of the films 12 and 13 is thermally welded (strongly bonded) by the heat sealing means to form the side seal portion 15, and the side seal portion 15 is forcibly cooled by the cooling means. In this case, the elongated seal bar and the elongated cooling bar used in the heat sealing means and the cooling means are parallel to the line flow. [5] The other side edges of the films 12 and 13 are thermally welded (strongly bonded) by the same heat sealing means as described above to form the side seal portion 16, and the side seal portion 16 is cooled similarly to the above. Forced cooling by means. [6] The sealing body 21 intervening between the two films 12 and 13 after being supplied onto the film 13 is bonded and integrated with the two films 12 and 13 by heat welding by heat sealing means. When such heat sealing means is used, the low adhesion layer 22 of the sealing body 21 is weakly bonded to the inner surface of the film 12, and the high adhesion layer 23 of the sealing body 21 is strongly bonded to the inner surface of the film 13. Through such adhesion, adhesive bands 22a and 23a shared with both films 12 and 13 are formed on the low adhesive layer 22 and the high adhesive layer 23, respectively, or preset non-adhesive bands ( 22b, 22c, 22d, 23b, and 23d) and a free portion 23c are formed. The elongate seal bar and elongate cooling bar used in the heat sealing means and the cooling means here are perpendicular to the line flow. As for the seal bar and the like, a predetermined one based on the type of the seal body 21 or the bonding mode is provided and used. [7] A predetermined portion (a portion corresponding to the bottom portion of the bag body 11) of both the films 12 and 13 is thermally welded (strongly bonded) by heat sealing means, and the bottom seal portion 19 of the bag body 11 is formed. The elongated seal bars and elongated cooling bars used in the heat sealing means and cooling means in such a case are also perpendicular to the line flow. By passing through the process so far, the bag 11 of the continuous state which made the both films 12 and 13 the main body is obtained. [8] Each bag 11 in a continuous state is cut and separated for each bag by the bag cutting process. In the bag cutting process at this time, a cutter that is elongated in a direction perpendicular to the flow of the line and descends or returns to the upper surface of the line is used. At the time of the bag cutting process with such a cutter, cutting is performed with the center of the adjacent portion being cut at each adjacent bag body 11 in a continuous state. That is, each bag 11 in a vertically connected state is cut and separated. [9] Each bag body 11 cut and separated for each bag is subjected to bag trimming processing. In this bag trimming process, trimming is performed for cutting out unnecessary portions and adjusting the bag shape.

  In the sealing treatment method of the present invention, when the sealing body 21 and the films 12 and 13 are thermally welded by the heat sealing means of [6], for example, when it is performed via a heat sealer, The welding temperature, welding pressure, and welding time are appropriately set. These optimum values differ depending on the material of the sealing body 2 and the films 12 and 13, but they are within the following ranges when the low temperature heat welding method and the high temperature heat welding method are included. Therefore, these welding temperature, welding pressure, and welding time are set based on the following ranges. About the range of welding temperature, it is 85-500 degreeC. The range of the welding pressure is 5 to 100 kg. The range of the welding time is 0.5 to 5 seconds. A typical example is a welding temperature of 150 to 300 ° C., a welding pressure of 30 to 85 kg, and a welding time of 1 to 2 seconds.

  The both films 12 and 13 used in the sealing treatment method of the present invention include those with an opening / closing tool 31 and those without an opening / closing tool. Depending on which one is used, a packaging bag with the opening / closing tool 31 is obtained, or a packaging bag without the opening / closing tool is obtained. Incidentally, both the films 12 and 13 with the opening / closing tool 31 are integrally formed with the female opening / closing member 31a of the opening / closing tool 31 on one film inner surface, and the female opening / closing member 31a of the opening / closing tool 31 is integrated with the other film inner surface. Is formed. If the packaging bag with the opening / closing tool 31 is made using both the films 12 and 13 without the opening / closing tool, for example, steps [1] and [2] in the sealing processing method illustrated in FIG. Or on the film 13 between step [2] and step [3], and then between step [5] and step [6] or between step [6] and step [7]. Alternatively, between step [7] and step [8], the opening / closing tool 31 is thermally welded (strongly bonded) to the films 12 and 13 by heat sealing means or cooling means using a seal bar or cooling bar orthogonal to the line. ) Or forced cooling. Step 7 of the seal processing method illustrated in FIG. 8 may be omitted, or in this step 7, instead of forming the bottom seal portion 19, a bag top portion (bag mouth portion) ) May form a top seal portion. In such a case, a predetermined heat sealing means or cooling means is removed from the line, or the assembly position on the line is changed. Further, step [6] in FIG. 8 can be applied by incorporating only this into various lines (including horizontal lines, vertical lines, and inclined lines) for bag making and bag filling.

  A specific example of the seal processing method described in FIG. 8 is as follows with reference to FIGS.

  9 (A) and 9 (B), both the films 12 and 13 are intermittently rewound and supplied from a film raw roll (not shown) to meet each other on the line. The seal body 21 is supplied onto the lower film 13 (on the inner surface of the film 13) from a direction orthogonal to the line immediately before the two films 12 and 13 merge. As an example, the sealing body 21 cut into a predetermined length is intermittently supplied onto the film 13 through the guide means. As another example, the film is cut into a predetermined length while being rewound from the seal body winding roll in the lower film direction, and is supplied onto the lower film 13 with good timing. In order to make the sealing body 21 supplied on the lower film 13 more stable, the sealing body 21 may be temporarily fixed to the lower film 13 by an instantaneous spot bonding means such as a low temperature heating bonding method. When both the films 12 and 13 in the joined state (overlapping state) with the sealing body 21 interposed therebetween advance in the line and reach the first stage sealing means (thermal welding means) 51, they are arranged in parallel with the line. A pair of upper and lower heat seal bars, which can be moved up and down, and a fixed lower seal bar (seal base) 51b corresponding to one side edge of both films 12 and 13 are strongly bonded to each other. (Heat welding). As a result, the above-described side seal portion 15 is formed at one side edge of the films 12 and 13. Immediately after finishing this bonding, the side seal portion 15 is cooled via the cooling means 52 combined with the sealing means 51. Incidentally, the cooling means 52 also comprises an upper cooling bar 52a arranged in parallel with the line and a fixed lower cooling bar (cooling table) 52b corresponding to the upper cooling bar 52a. Of these, the upper cooling bar 52a is movable up and down, and the lower cooling bar 52b is fixed. And both cooling bar 52a * 52b rapidly cools one side edge of both films 12 * 13 by pinching (surface contact) from the upper and lower sides. Therefore, in the case of both the cooling bars 52a and 52b, a metal and / or ceramic having a large heat capacity is used on the surface contact side with the film. Further, when both films 12 and 13 reach the second-stage sealing means 53 and cooling means 54, the other side edges of both films 12 and 13 are strongly bonded to each other through these means 53 and 54 (heat It is welded or cooled. By receiving such a process, the aforementioned side seal portion 16 is formed on the other side edges of the films 12 and 13. Similar to that of the first stage, the second stage sealing means 53 includes an upper seal bar 53a which is arranged in parallel with the line and which can move up and down, and a lower seal bar (seal base) 53b in a fixed state corresponding thereto. It consists of Similarly to that of the first stage, the second stage cooling means 54 includes an upper cooling bar 52a arranged in parallel with the line and capable of moving up and down, and a fixed lower cooling bar (cooling table) 52b corresponding thereto. Consists of. Accordingly, the functions of the second-stage sealing means 53 and the cooling means 54 are the same as those of the first-stage.

  9A and 9B, when both the films 12 and 13 and the sealing body 21 therebetween reach the third-stage sealing means 55, they can also be moved up and down which also constitute the sealing means 55. The upper seal bar 55a and a fixed lower seal bar (seal base) 55b are provided. However, the upper seal bar 55a and the lower seal bar (seal base) 55b in this case are not different in principle from the above-described respective sealing means 51 and 53, but some aspects are configured. ing. This will be described below with reference to FIGS. 9C and 9D.

  The third-stage sealing means 55 shown in FIGS. 9C and 9D as an example is a combination of an upper seal bar 55a and a lower seal bar 55b. Of these, in the case of the upper seal bar 55a, an open bottom hollow body 61a whose upper surface is closed with a removable upper lid, and a front end portion (lower end portion) that is stored and held in the hollow body 61a so as to be movable up and down. The heater block 62a protrudes from the open lower surface of the hollow body 61a, the heater 63a embedded in the heater block 62a, and the welding plate member 64a attached to the tip of the heater block 62a in a detachable (replaceable) manner. A heat transfer plate 65a and a heat insulating plate 66a attached to the surface (lower surface) of the welding plate member 64a in a replaceable manner, and housed on the heater block 62a in the hollow body 61a and elastically pressurizing the heater block 62a downward The spring 67a is used as a main component. On the other hand, the other lower seal bar 55b also has an open top hollow body 61b whose lower surface is closed with a removable upper lid, and is housed and held in the hollow body 61b, with its tip (upper end) being open to the hollow body 61b. A heater block 62b protruding from the upper surface, a heater 63b embedded in the heater block 62b, a welding plate member 64b attached to the tip of the heater block 62b in a detachable (replaceable) manner, and a welding plate member The heat transfer plate 65b and the heat insulation plate 66b attached to the surface (upper surface) of the 64b in a replaceable manner are mainly configured.

  The constituent elements of the seal bars 55a and 55b are of the following material, material, shape and structure. The hollow bodies 61a and 61b are made of a highly heat-resistant and high-strength material selected from metal, synthetic resin (including FRP), reinforced ceramic, and the like, such as metal, synthetic resin (including FRP), and reinforced ceramic. It is made in the shape of an elongated hollow plate. The heater blocks 62a and 62b are made of a heat conductive metal such as copper, copper alloy, aluminum, aluminum alloy and the like, and are formed in an elongated block shape that can be accommodated in the hollow bodies 61a and 61b. It is what. The heaters 63a and 63b are sheath heaters having good heat distribution characteristics as a representative example. The welded plate members 64a and 64b are made of a metal or synthetic resin having a good thermal conductivity and excellent mechanical properties, and are formed in an elongated cap shape. Further, the welding mold plate members 64a and 64b are formed with respect to the tips of the heater blocks 62a and 62b. It is detachably attached by a known attachment means such as a mounting bracket or a screw. The heat transfer plates 65a and 65b are also formed in an elongated tape shape with a metal or synthetic resin having good thermal conductivity and mechanical properties. In contrast, the heat insulating plates 66a and 66b are formed in an elongated tape shape with a poor heat conductor (metal or synthetic resin) having good mechanical properties but low thermal conductivity. The spring 67a is made of a known highly elastic material (metal or synthetic resin).

  The heat transfer plates 65a and 65b and the heat insulating plates 66a and 66b are mounted on the surface of the welding plate members 64a and 64b in an appropriate combination. When the seal pattern is determined based on the combination of both, and the seal process based on this (the seal process via the third-stage seal means 55) is performed, the description has been given with reference to FIGS. A seal pattern of weak adhesion or strong adhesion can be obtained. Therefore, in the case of the heat transfer plates 65a and 65b and the heat insulation plates 66a and 66b, various lengths of various widths are prepared with a constant length. In the third-stage sealing means 55 shown in FIGS. 9A and 9B, the heat transfer plates 65a and 65b and the heat insulating plates 66a and 66b are appropriately selected based on the required sealing mode. 9 (D), it is attached to the welding mold plate members 64a and 64b.

  The third-stage sealing means 55 in FIGS. 9A and 9B is as described above. Accordingly, when the films 12 and 13 with the sealing body 21 interposed therebetween advance in the line and reach the third-stage sealing means 55, the upper seal bar 51a that can move up and down perpendicular to the line and the upper seal bar 51a correspond to this. The films 12 and 13 and the sealing body 21 are heat-welded by the lower seal bar 51b in a fixed state. That is, one film 12 and the low adhesion layer 22 of the seal body 21 are weakly bonded, and the other film 13 and the high adhesion layer 23 of the seal body 21 are strongly bonded. More specifically, an adhesive band portion 22a and non-adhesive band portions 22b and 22c are formed between the one film 12 and the low adhesive layer 22 of the sealing body 21, and the other film 13 Adhesive band portions 23a and non-adhesive band portions 23b and 23c are formed between the highly adhesive layer 22 of the sealing body 21. Immediately after the sealing process by the third-stage sealing means 55, the sealing part (the place where the sealing body 21 is located) is cooled by the cooling means 56 combined with the sealing means 55. The cooling means 56 is also composed of an upper cooling bar 56a arranged orthogonal to the line and a fixed lower cooling bar (cooling table) 56b corresponding to the upper cooling bar 56a. Among them, the upper cooling bar 56a is movable up and down and the lower cooling bar 56b is fixed in the same manner as the other cooling means. Therefore, the above-mentioned sealing processing part is sandwiched from above and below by both cooling bars 52a and 52b. It will be cooled quickly after being attached.

  After the sealing process in the lines of FIGS. 9A and 9B, when the corresponding portions of the bottoms of the films 12 and 13 (portions that become the bottoms of the bag bodies 21) reach the fourth-stage sealing means 57, the line The predetermined portions of the films 12 and 13 are bonded together by heat welding by means of an upper seal bar 57a that is vertically movable with respect to the upper seal bar 57a and a fixed lower seal bar 57b. As a result, a bottom seal portion 19 serving as a bottom portion is formed on both the films 12 and 13. Immediately after this bonding, the bottom seal portion 19 is cooled via the cooling means 58 combined with the sealing means 51. Similarly to the cooling means 56, the cooling means 58 includes an upper cooling bar 56a arranged orthogonal to the line and a fixed lower cooling bar (cooling table) 56b corresponding to the upper cooling bar 56a. Is quickly cooled. In the subsequent processing in the lines of FIGS. 9A and 9B, first, each bag body 11 in a continuous state is cut and separated one bag at a time by the bag cutting processing means 59 subsequent to the cooling means 58. This bag cutting processing means 59 is of a shearing cut type (well-known), in which an upper cutter 59a that can be moved up and down and a lower cutter 59b that is arranged corresponding thereto are arranged perpendicular to the line. It is. Therefore, according to this, whenever the upper cutter 59a descends toward the lower cutter 59b, the bottom seal portion of both the films 12 and 13 is cut, and the bag body 11 separated for each bag is obtained. Thereafter, each bag 11 cut and separated for each bag is shaped by receiving a well-known bag trimming process.

  When the films 12 and 13 having no opening / closing tool are used in the lines of FIGS. 9A and 9B, the opening / closing tool 31 (the female opening / closing member 31a and the male opening / closing member is provided on the films 12 and 13 on the line. When the member 31b) is attached, for example, the opening / closing tool 31 is supplied onto the film 13 from the direction orthogonal to the line at the front stage or the rear stage of the seal body supply location, and the front stage of the sealing means 55 at the third stage. Alternatively, the opening / closing tool 31 may be thermally welded (strongly bonded) to the inner surfaces of the films 12 and 13 in the subsequent stage. The sealing means and cooling means used at this time are the same as the fourth-stage sealing means 57 and cooling means 58. 9A and 9B, the bottom seal portion is replaced with the bottom seal portion by the fourth-stage sealing means 57 and the cooling means 58 in accordance with the above-described content that the bottom seal portion is changed to the top seal portion. The top seal portion can be formed or cooled. Further, when the bottom seal portion, the top seal portion and the like are not formed, the fourth-stage sealing means 57 and the cooling means 58 are omitted.

  Next, an embodiment other than the above will be described with reference to FIGS. 10 and 11 for the sealing treatment method inside a packaging bag according to the present invention. In the embodiment of FIGS. 8 and 9 and the embodiment of FIGS. 10 and 11, the bag body 11 produced in the former is “in a series”, whereas the bag body 11 produced in the latter is The only difference is that it becomes “horizontal”. Therefore, both technical contents are common in many respects. Accordingly, the embodiment shown in FIGS. 10 and 11 will be described mainly with respect to the difference from the former, and the rest will be omitted by referring to the embodiment shown in FIGS. Of course, in the embodiment of FIGS. 10 and 11, all matters described in the embodiment of FIGS. 8 and 9 can be adopted within the scope of technical compatibility.

  The flow of the processing line in FIG. 10 is as follows. [1] The bag-backing film 13 is rewound and supplied in a predetermined direction from the roll-shaped film original. [2] The seal body 21 is rewound and supplied in a predetermined direction from the roll-shaped tape original. The supply direction of the sealing body 21 is the same as the supply direction of the film 13 and is along the line flow. And the sealing body 21 gets on the film 13 (on the inner surface of the film 13). [3] The bag surface film 12 is fed back in a predetermined direction from the roll-shaped film original and overlapped on the film 13. At this stage, the sealing body 21 enters an intervening state between the films 12 and 13. Obviously, the supplies [1] to [3] by intermittent feeding are synchronized and synchronized. [4] The seal body 21 intervening between the films 12 and 13 is bonded and integrated with the films 12 and 13 by heat welding. The heat seal at this time is parallel to the line, and the heat seal content is that the low adhesive layer 22 of the seal body 21 is weakly bonded to the inner surface of the film 12 and the high adhesive layer 23 of the seal body 21. Is strongly bonded to the inner surface of the film 13. Immediately after this, the sealing part of the sealing body 21 and both the films 12 and 13 is forcibly cooled by the cooling means. [5] A predetermined portion (a portion corresponding to the bottom portion of the bag body 11) of both the films 12 and 13 is thermally welded (strongly bonded) by heat sealing means, and the bottom seal portion 19 of the bag body 11 is formed. The elongated seal bar and elongated cooling bar used in the heat sealing means and cooling means in such a case are also parallel to the line flow. [6] One side edge of the films 12 and 13 is thermally welded (strongly bonded) by the heat seal means to form the side seal portion 15 and the side seal portion 15 is forcibly cooled by the cooling means. In this case, the elongated seal bar and the elongated cooling bar used in the heat sealing means and the cooling means are perpendicular to the line flow. [7] The other side edges of the films 12 and 13 are thermally welded (strongly bonded) by the same heat sealing means as described above to form the side seal portion 16, and the side seal portion 16 is cooled similarly to the above. Forced cooling by means. [8] Each bag is cut and separated by the bag cutting process. Here, each bag body 11 in a side-by-side state is cut and separated. [9] The bag trimming process is the same as described above.

  Step [5] of the seal processing method illustrated in FIG. 10 may be omitted, or in this step [5], instead of forming the bottom seal portion 19, ) May form a top seal portion. In such a case, as in the previous example, the predetermined heat sealing means and cooling means are removed from the line, or the assembly position on the line is changed. Furthermore, step [4] in FIG. 10 can be applied by incorporating only this into various lines (including horizontal lines, vertical lines, and inclined lines) for bag making and bag filling.

  A specific embodiment of the seal processing method described in FIG. 10 is as follows with reference to FIG. The specific embodiment of FIG. 11 is common in many respects to the specific embodiment of FIG. 9 as described above. Therefore, the following description regarding the specific embodiment of FIG. 11 is centered on differences from the previous example.

  In FIG. 11, both the films 12 and 13 and the seal body 21 are supplied in the same direction by intermittent feeding, so that the seal body 21 intervenes between both films 12 and 13. When these three members reach the first-stage sealing means 71 and the cooling means 72, both films 12 and 13 and the sealing body 21 are provided via an upper seal bar 71a that can move up and down and a lower seal bar 71b that is fixed. Are cooled by the upper cooling bar 72a that can move up and down and the fixed lower cooling bar 72b. That is, the low adhesive layer 22 of the sealing body 21 is weakly bonded to the inner surface of one film 12, or the high adhesive layer 23 of the sealing body 21 is strongly bonded to the inner surface of the other film 13, and immediately after that, the sealing portion is To be cooled. When both films 12 and 13 reach the second stage sealing means 73 and cooling means 74, the bottom portions of both films 12 and 13 are strongly bonded to form the bottom seal portion 19, and immediately after that, the seal The part is cooled. That is, the strong bonding at this time is performed by the upper seal bar 74a that can move up and down and the fixed lower seal bar 74b, and the cooling at this time and the upper cooling bar 75a that can move up and down and the fixed lower cooling bar 74b. With the bar 75b. When the third-stage sealing means 75 and the cooling means 76, the fourth-stage sealing means 77 and the cooling means 78 are used, the upper seal bars 75a and 77a and the lower seal bars 75b and 77b, respectively, Through the upper cooling bars 76a and 78b and the lower cooling bars 76b and 78b, predetermined portions of the films 12 and 13 are strongly bonded or cooled immediately thereafter. As a result, the aforementioned both side seal portions 15 and 16 are formed. The next bag cutting processing means 79 is performed by a shearing cut type upper cutter 79a and a lower cutter 79b in the same manner as described above, whereby the side-by-side bags 11 are cut and separated. Thereafter, the bag trimming process described above is performed.

  When the films 12 and 13 having no opening / closing tool are used in the line of FIG. 11, the opening / closing tool 31 (the female opening / closing member 31a and the male opening / closing member 31b) is attached to the films 12 and 13 on the line. For example, the opening / closing tool 31 is supplied onto the film 13 in parallel with the line as in the case of the sealing body 21, and the supplied opening / closing tool 31 is supplied to the films 12 and 13 in the same manner as in the sealing body 21. What is necessary is just to heat-weld (strong adhesion) or cool to the inner surface. The sealing means and cooling means used at this time may be the same as those for the sealing body 21. In the line of FIG. 11, when following the above-described content of changing the bottom seal portion to the top seal portion, the sealing means 73 and the cooling means 74 on the left side of the line (upper side of FIG. 11) are placed on the right side of the line (FIG. 11). The top seal portion can be formed or cooled by changing the arrangement to the lower side. Further, when the bottom seal portion and the top seal portion are not formed, the sealing means 57 and the cooling means 58 are omitted.

  The easy-open packaging bag according to the present invention satisfies a high degree of easy peelability and a high degree of sealability with a simple configuration, and can achieve high production. Therefore, the technical content regarding this packaging bag is highly industrially applicable.

DESCRIPTION OF SYMBOLS 11 Bag body 12 Bag surface film 13 Bag back film 14 Opening part 15 Side seal part 16 Side seal part 17 Upper space part 18 Storage space part 19 Bottom seal part 21 Seal body 22 Low adhesion layer 22a Adhesive belt part 22b Non-adhesive band 22c Non-adhesive band 22d Non-adhesive band (intermediate non-adhesive band)
23 High adhesive layer 23a Adhesive band part 23b Non-adhesive band part 23c Free part 24 Intermediate layer 31 Opening / closing tool 31a Female opening / closing member 31b Male opening / closing member

Claims (9)

A bag body having a bag surface film and a bag back film and formed into a bag shape has an opening on its upper end side, and
A sealing body having a laminated structure provided on the opening side in the bag body and extending between both side portions of the bag body includes a horizontally long tape-like low adhesive layer and a horizontally long tape-like high adhesive layer, and the seal. For the two layers of the body, the layer surface of the low adhesion layer forming one side of the seal body is weakly adhered to the inner surface of the one film while maintaining easy peelability to the one film. The layer surface of the highly adhesive layer forming the other surface of the sealing body is strongly adhered to the inner surface of the other film while maintaining the hard-to-peel property to the other film, and the one film When the adhesive strength of the low adhesive layer to the inner surface is an easily peelable adhesive strength and the adhesive strength of the high adhesive layer to the other film inner surface is an easily peelable adhesive strength, the easily peelable adhesive strength is Difficult In easy-open packaging bags that are assumed to be below the peelable adhesive strength,
There is a relative height difference between the upper end of the low adhesive layer and the upper end of the high adhesive layer in the sealing body, and the upper end of the high adhesive layer is above the upper end of the low adhesive layer. Protruding, and
On the upper surface of the low adhesion layer, a horizontally long non-adhesive band extending between both sides of the bag body is integrally formed, and below the non-adhesive band on the lower adhesive layer surface, A horizontally-long adhesive band extending between both sides in the bag is integrally formed; and
The adhesive surface in the adhesive band portion of the low adhesive layer is weakly bonded to the inner surface of the film in a facing relationship with the adhesive surface, and the non-adhesive surface in the non-adhesive band portion of the low adhesive layer is in a facing relationship with this. Non-adherent to the inner surface of a film, and
On the upper layer surface of the high adhesive layer, a horizontally long band-shaped adhesive band extending between both sides in the bag body is integrally formed, and
The adhesive surface in the adhesive band portion of the high adhesive layer is strongly bonded to the inner surface of the film in a facing relationship with this, and
About the upper side of the adhesive band of the low adhesive layer and the upper end of the high adhesive layer, the upper side of the adhesive band of the low adhesive layer is lower than the upper end of the high adhesive layer, and the low adhesive layer the adhesive strip portion upper side of the adhesive strip portion upper side and the high adhesive layer, the adhesive strip portion upper side of the low adhesive layer is in a position lower than the adhesive strip portion upper side of the high-adhesion layer, and,
The low adhesive layer on the upper end side of the low adhesive layer between the one film inner surface to which the low adhesive layer is weakly bonded and the upper inner surface of the high adhesive layer facing the one film inner surface And a gap based on the relative height difference between the upper end portion and the high adhesive layer is interposed, and
The upper end of the bag front film and the upper end of the bag back film are gripped when the adhesive surface of the low adhesive layer that is weakly bonded to the inner surface of one of the films is peeled off from the inner surface of the film. Are separated in directions away from each other, and the upper end portions of the respective layers are separated from each other to peel the adhesive surface of the low adhesive layer from the inner surface of the one film, and
The initial peeling load when peeling the low adhesive layer from the inner surface of the one film is applied to the weak adhesive region on the upper side of the adhesive band portion in the weak adhesive state of the low adhesive layer. Open type packaging bag. A bag body having a bag surface film and a bag back film and formed into a bag shape has an opening on its upper end side, and
A sealing body having a laminated structure provided on the opening side in the bag body and extending between both side portions of the bag body includes a horizontally long tape-like low adhesive layer and a horizontally long tape-like high adhesive layer, and the seal. For the two layers of the body, the layer surface of the low adhesion layer forming one side of the seal body is weakly adhered to the inner surface of the one film while maintaining easy peelability to the one film. The layer surface of the highly adhesive layer forming the other surface of the sealing body is strongly adhered to the inner surface of the other film while maintaining the hard-to-peel property of the other film, and the highly adhesive layer In the lower part of the surface of the layer, a horizontally long strip-like free part extending over both sides of the highly adhesive layer is included, and the free part is released from the other film inner surface, and
When the adhesive strength of the low adhesive layer to the inner surface of the one film is an easily peelable adhesive strength and the adhesive strength of the high adhesive layer to the inner surface of the other film is an easily peelable adhesive strength, easily peelable Easy-open packaging bags that assume that the adhesive strength is less than the peel-resistant adhesive strength,
There is a relative height difference between the upper end of the low adhesive layer and the upper end of the high adhesive layer in the sealing body, and the upper end of the high adhesive layer is above the upper end of the low adhesive layer. Protruding, and
On the upper surface of the low adhesion layer, a horizontally long non-adhesive band extending between both sides of the bag body is integrally formed, and below the non-adhesive band on the lower adhesive layer surface, A horizontally-long adhesive band extending between both sides in the bag is integrally formed; and
The adhesive surface in the adhesive band portion of the low adhesive layer is weakly bonded to the inner surface of the film in a facing relationship with the adhesive surface, and the non-adhesive surface in the non-adhesive band portion of the low adhesive layer is in a facing relationship with this. Non-adherent to the inner surface of a film, and
On the upper layer surface of the high adhesive layer, a horizontally long band-shaped adhesive band extending between both sides in the bag body is integrally formed, and
The adhesive surface in the adhesive band portion of the high adhesive layer is strongly bonded to the inner surface of the film in a facing relationship with this, and
Regarding the upper side of the adhesive band part of the low adhesive layer and the upper side of the adhesive band part of the high adhesive layer, the upper side of the adhesive band part of the low adhesive layer is lower than the upper side of the adhesive band part of the high adhesive layer, and
About the upper side of the adhesive band of the low adhesive layer and the upper end of the high adhesive layer, the upper side of the adhesive band of the low adhesive layer is lower than the upper end of the high adhesive layer, and the low adhesive layer the adhesive strip portion upper side of the adhesive strip portion upper side and the high adhesive layer, the adhesive strip portion upper side of the low adhesive layer is in a position lower than the adhesive strip portion upper side of the high-adhesion layer, and,
The low adhesive layer on the upper end side of the low adhesive layer between the one film inner surface to which the low adhesive layer is weakly bonded and the upper inner surface of the high adhesive layer facing the one film inner surface And a gap based on the relative height difference between the upper end portion and the high adhesive layer is interposed, and
The upper end of the bag front film and the upper end of the bag back film are gripped when the adhesive surface of the low adhesive layer that is weakly bonded to the inner surface of one of the films is peeled off from the inner surface of the film. Are separated in directions away from each other, and the upper end portions of the respective layers are separated from each other to peel the adhesive surface of the low adhesive layer from the inner surface of the one film, and
The initial peeling load when peeling the low adhesive layer from the inner surface of the one film is applied to the weak adhesive region on the upper side of the adhesive band portion in the weak adhesive state of the low adhesive layer. Open type packaging bag. Regarding the vertical width of the adhesive band portion and the vertical width of the non-adhesive band portion on the layer surface of the low adhesive layer, when the vertical width of the adhesive band portion is S11, and the vertical width of the non-adhesive band portion is S12, The easy-open type packaging bag according to claim 1 or 2, wherein the vertical width of the two belt portions satisfies the relationship [S11≥S12] . The layer surface of the low-adhesion layer has a non-adhesive strip at the top of the layer surface, and an intermediate non-adhesive strip at the upper and lower intermediate portions of the layer surface. Non-adhesive to the film inner surface
The easy open type packaging bag according to any one of claims 1 to 3 . The low adhesion layer and the high adhesion layer are directly strongly bonded through the facing portions of both layers.
The easy open type packaging bag according to any one of claims 1 to 4 . An intermediate layer is interposed between the low adhesive layer and the high adhesive layer, and the intermediate layer is strongly bonded to both the low adhesive layer and the high adhesive layer via both surfaces thereof.
The easy-open packaging bag according to any one of claims 1 to 5 . The adhesive surface in the adhesive band portion of the low adhesive layer is weakly bonded to the inner surface of the film in a face-to-face relationship so as to be capable of interfacial peeling.
The easy open type packaging bag according to any one of claims 1 to 6 . An opening / closing tool comprising a male opening / closing member and a female opening / closing member that can be freely opened and closed is disposed between both side portions of the bag body along the seal body provided on the opening side of the bag body, and The opening / closing members of the opening / closing tool are respectively bonded to the inner surfaces of the films.
The easy open type packaging bag according to any one of claims 1 to 7 . An opening / closing tool comprising a male opening / closing member and a female opening / closing member that can be freely opened and closed is provided below the seal body .
The easy open type packaging bag according to claim 8 .

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