JP2007261640A - Fastener and packaging bag which can be heat-sterilized - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-sterilizable fastener which has an excellent liquid-tightness and a sure tearing property by hands at a good productivity in the fastener having a tearable section which ensures the liquid-tightness on one side of the engaging section of the fastener. <P>SOLUTION: This fastener consists of a male type fastener tape and a female type fastener tape which have a male strip and a female strip being engageable with each other. In this case, on both sides of the male strip and the female strip, a flange section is respectively formed. Then, the flange sections on the anti-unsealing sides of the male type fastener tape and the female type fastener tape are connected with a tearable tape. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a fastener applicable to a flexible packaging bag and a packaging bag formed by applying the fastener, and more particularly to effectively prevent the exudation of contents during heat sterilization. The present invention relates to a fastener and a packaging bag that can be used.

Conventionally, a fastener made of a male fastener tape and a female fastener tape each having a male strip and a female strip that can be engaged with each other is provided near the edge of a part of the flexible packaging bag, and above the fastener forming portion. A packaging bag formed by heat-sealing the edges is known. When the packaging bag is opened for the first time, the heat seal portion above the fastener forming portion is cut and removed, then the fastener is opened, the contents are taken out, and the fastener is closed and resealed as necessary. It can be done.
However, it is difficult to ensure complete liquid-tightness only by the occlusion of the male and female strips of such fasteners. For example, when the external pressure is applied to the portion in which the contents are accommodated or the paste is heat sterilized. In some cases, the content leaks from the occlusal portion of the fastener, the content accumulates in the space between the fastener and the heat seal portion, and the content overflows or scatters when the heat seal portion is cut and removed. There was a problem that it would end up.

  In order to solve such problems, interfacial debonding is possible with heat seal strength that can be manually delaminated between both zipper tapes, at least in the lower position of the upper and lower positions of the engaging portion between zipper tapes. Alternatively, a packaging bag with a zipper that is bonded so as to be capable of delamination or cohesive peeling has been proposed (Patent Document 1). Also, a fastener of a type that opens and closes an occlusal portion formed by a male strip and a female strip formed along the upper end of the U-shaped track by a slider is inserted into the mouth of the bag body, and the side surface of the position of the track of the fastener The bag body mouth is sealed by sealing only the bag body mouth, and then the opening is performed by opening the fastener and tearing the central portion of the track, and the subsequent sealing is performed by the fastener. A bag formed by attaching a slide fastener formed in the mouth is proposed (Patent Document 2).

JP 2004-168420 A Japanese Patent Laid-Open No. 2003-053860

The packaging bag to which the fastener is attached can improve the liquid-tightness of the fastener and prevent the contents from accumulating between the fastener and the heat seal portion. Since the zipper tape needs to be joined with a seal strength that allows the zipper tape to be peeled off manually, it is necessary to use a special material at least on the joining surface side inside the fastener, and the contents should be stored after filling and sealing. When heat sterilization is necessary, it is necessary to have heat resistance corresponding to the heat treatment, so that usable materials are limited, and it is inferior in economic efficiency, and under high temperature conditions such as retort sterilization. There is also a problem that the liquid-tightness is not sufficient when placed.
Moreover, generally the fastener which has the shape mentioned above is shape | molded by the profile extrusion molding method, However, In the fastener described in the said patent document 2, the part torn of the track center part is formed thinly compared with another part, Since it is necessary to mold the relatively thick fastener part and the thin part to be torn at the same time, it is difficult to make the thickness of the thin part uniform and the pinhole is formed because it is too thin. There is a problem that the productivity is inferior, such that the thickness of the tearing portion becomes thick and the tearability is impaired when trying to stabilize or stabilize the quality.

Accordingly, an object of the present invention is to provide a fastener having excellent liquid-tightness and reliable tearability by hand, in a fastener having a portion that ensures tear-tightness on one side of the occlusal portion of the fastener. It is to provide without causing such problems.
Another object of the present invention is that high-temperature heat sterilization such as retort sterilization is possible, and even when subjected to such high-temperature heat sterilization, the contents accumulate in the space between the fastener and the heat seal part. It is an object of the present invention to provide a zippered packaging bag that is effectively prevented and can be easily torn by hand.

According to the present invention, there is provided a fastener comprising a male fastener tape and a female fastener tape having a male strip and a female strip that can be engaged with each other, and flange portions are formed on both sides of the male strip and the female strip, respectively. Thus, there is provided a fastener characterized in that flange portions on the opposite side of the male fastener tape and the female fastener tape are connected by a tearable tape.
According to the fastener of the present invention,
1. The fastener tape is made of heat-resistant resin and can be sterilized by heating.
2. The surface of the fastener tape to be joined to at least the tearable tape is made of polypropylene, and the tearable tape is made of a uniaxially stretched polypropylene film;
3. The surface of the fastener tape to be joined to at least the tearable tape is made of polypropylene, and the tearable tape is made of a biaxially stretched polypropylene film;
4). The surface of the fastener tape to be joined to at least the tearable tape is made of polypropylene, and the tearable tape is made of a foamed polypropylene film,
5). A surface of the fastener tape to be bonded to at least a tearable tape is made of polypropylene, and the tearable tape is made of an unstretched polypropylene film at least partially heat-treated,
Is preferred.

Furthermore, according to the present invention, in the packaging bag formed by heat-sealing the peripheral edge of the flexible film, the fastener is located on a part of the inner side of the heat-sealing portion, and the tearable tape is on the inside of the packaging bag. A packaging bag is provided, which is joined to the inner surface of the packaging bag so as to be positioned at a position, and a heat seal portion corresponding to the fastener joint is formed to be openable.
In the packaging bag of the present invention, it is preferable that the flexible bag and the fastener are made of a heat resistant resin and can be sterilized by heating.

According to the fastener of the present invention, even when it is subjected to heat sterilization, it is effectively prevented that the contents pass through the fastener, liquid-tightness is reliably ensured, and molding is easy. Excellent productivity. The tearability of the tearable tape that breaks after releasing the bite of the fastener is excellent, so that it is also excellent in opening.
In particular, when the surface of the fastener tape to which at least the tearable tape is joined is made of polypropylene, the tearable tape is a uniaxially stretched polypropylene film, a biaxially stretched polypropylene film, a foamed polypropylene film, or an unstretched polypropylene obtained by heat-treating at least a part thereof. By comprising any of the films, it is possible to tear the tearable tape more easily while ensuring reliable liquid tightness, and it has heat resistance that can withstand high temperature heat sterilization such as retort sterilization. can do.
Furthermore, since the packaging bag of the present invention also has resealability, heat sterilization is essential, such as enteral nutrients and liquid foods, and the contents are diluted with water at the time of use. It can be suitably used for applications and the like.

The fastener of this invention is demonstrated based on an accompanying drawing.
FIG. 1 is a side sectional view of an example of the fastener of the present invention.
The fastener of the present invention represented as a whole by 1 comprises a male fastener tape 2 and a female fastener tape 3, and a tearable tape 4 that connects the male fastener tape 2 and the female fastener tape 3.
The male fastener tape 2 is composed of a male strip 21 extending from the front of the sheet of FIG. 1 toward the back, and an upper flange portion 22 and a lower flange portion 23 located on both sides of the male strip 21, while a female mold is provided. The fastener tape 3 has a recess into which the male strip 21 can be fitted. Like the male fastener tape 2, the female strip 31 extending from the front of the paper surface of FIG. The upper flange portion 32 and the lower flange portion 33 are located. Further, ribs 24 and 34 are formed on the occlusal surface side of the upper flange portions 22 and 32 of the male fastener 2 and the female fastener 3 to prevent slippage when the fastener is engaged or released, respectively.

In this aspect, the tearable tape 4 is the contents side, the lower end of the anti-occlusion surface 23 a of the lower flange portion 23 of the male fastener tape 2 and the anti-occlusion surface 33 a of the lower flange portion 33 of the female fastener tape 3. Opposite edge portions 41a and 41b are joined to the lower end of each to connect the male fastener tape 2 and the female fastener tape 3, respectively.
The tearable tape 4 has an easy tearability that can be easily broken in the same direction as the male and female strips at the center of the portion 42 not joined to the male fastener 2 and the female fastener 3. Have.

FIG. 2 shows an example in which the fastener tape shown in FIG. 1 is applied to the flexible bag 5.
In the flexible bag represented as a whole by 5, the end portions of the two opposing resin films 51a and 51b are joined by heat sealing, and an opening-scheduled portion 53 that can be easily cut is formed below the heat sealing portion 52. Has been. 1, the fastener of the present invention shown in FIG. 1 is located on the inner side of the upper flange 22 of the male fastener tape 2 and the upper flange 32 of the female fastener tape 3. In each upper part of the anti-occlusion surface 32a, it joins with the inner surface of resin film 51a, 51b.
As shown in FIG. 2, since the content liquid L in the flexible bag is liquid-tightly held by the tearable tape 4, the occlusal portion 6 of the male strip 21 and the female strip 31 of the fastener and the tearable tape. Naturally, the space 8 formed between the heat seal portion 52 and the male strip 21 of the fastener and the occlusal portion 6 of the female strip 31 does not enter the space 7 formed between the four. There is no liquid present.

In order to open the flexible bag 5 shown in FIG. 2, first, the heat seal portion 52 shown in FIG. 2 is cut and removed along the planned opening portion 53. At this time, according to the fastener tape of the present invention, since the content liquid is not leaked between the heat seal portion 52 and the occlusal portion 6 of the fastener, the content liquid is removed when the planned opening portion 53 is cut and removed. There will be no situation of running out or splashing.
Next, as shown in FIG. 3, after the occlusion of the male strip 21 and the female strip 31 of the fastener is released, the tearable tape 4 is cut as shown in FIG.
In addition, resealing is possible by re-engaging the male strip 21 and female strip 31 of the fastener.

The fastener tape of the present invention is not limited to the embodiment shown in FIGS. 1 to 3, and various changes can be made.
For example, in the fastener tape 1 of the present invention shown in FIG. 5, the shape of the male fastener 2 and the female fastener 3 is the same as that of the fastener tape shown in FIG. 1, but the joining position of the tearable tape 4 is different from FIG. Differently, the edges of the tearable tape 4 are joined to the occlusal surfaces of the lower flange portions 23 and 33 of the male fastener tape 2 and the female fastener tape 3, and a part of the tearable tape 4 is part of the male fastener tape 2 and the female fastener tape 2. This is an aspect in which the lower flange portion lower ends 25 and 35 of the mold fastener tape 3 protrude.
The fastener tape 1 of the present invention shown in FIG. 6 is substantially the same in shape as the fastener tape shown in FIG. 5, but the tearable tape 4 is a lower flange portion lower end 25 of the male fastener 2 and the female fastener 3 and It is an aspect that does not protrude below 35. According to this aspect, when the tearable tape 4 is handled in a state where the male fastener 2 and the female fastener 3 are joined, the tearable tape is effectively prevented from being damaged due to contact with other objects. be able to.

(Fastener tape)
The material constituting the fastener tape of the present invention is required to have appropriate flexibility and rigidity, and is not limited thereto, but olefin resins such as polypropylene and polyethylene can be suitably used.
In particular, in the present invention, the fastener tape is preferably made of a heat-resistant resin because it can effectively prevent leakage of the content liquid during heat sterilization. In the case of assuming a relatively low temperature heat sterilization, it can be made of polyethylene, but has a heat resistance that enables heat sterilization under high temperature and high humidity conditions such as retort sterilization (105 to 135 ° C.). In order to make it comprise, it is preferable that it is a polypropylene. Thereby, even after heat sterilization, the deformation of the fastener can be prevented, and it becomes possible to ensure occlusion.
Further, the fastener tape may be formed of a single layer structure of the above resin, but a heat sealing resin having a relatively low melting point is formed on a portion to be a joint surface with the flexible bag or a tear tape. A laminated structure having a layer made of
Such male fastener tape and female fastener tape can be formed by profile extrusion of the above resin.

(Tearable tape)
The tearable tape used in the fastener of the present invention can be used without limitation as long as it can be easily torn by hand in the direction perpendicular to the male strip direction of the male fastener tape and the female strip direction of the female fastener tape. However, for example, the tearability can be improved by using a film stretched uniaxially or biaxially.
In the present invention, it is preferable to have heat resistance capable of withstanding heat sterilization, particularly retort sterilization. Therefore, as described above, the fastener tape is preferably made of polypropylene. Therefore, the tearable tape is also bonded. Is preferably made of the same kind of resin, and is preferably uniaxially stretched polypropylene film, biaxially stretched polypropylene film, foamed polypropylene film, at least partially heat-treated It is preferably made of any one of polypropylene films.

A uniaxially stretched polypropylene film is stretched in the direction perpendicular to the male and female directions so as to release the bite of the fastener tape by stretching in the direction of male and female stripes. The uniaxially stretched polypropylene film is excellent in productivity because it does not require post-treatment unlike the heat-treated unstretched polypropylene film described later.
The thickness of the uniaxially stretched polypropylene film is not particularly limited, but is preferably in the range of 10 to 100 μm.

A uniaxially stretched polypropylene film is stretched in a direction perpendicular to the male and female directions so as to release the bite of the fastener tape by stretching in the direction of the male and female stripes and in a direction perpendicular thereto. In addition, the biaxially stretched polypropylene film can be easily torn in the direction of male and female stripes, and the post-treatment is not required as in the heat-treated unstretched polypropylene film described later, so that the productivity is excellent. .
The thickness of the biaxially stretched polypropylene film is not particularly limited, but is preferably in the range of 10 to 100 μm.

In addition, the expanded polypropylene film has a large number of bubbles in the polypropylene film, so that the elongation of the film is suppressed and can be easily torn.
A foamed polypropylene film is formed by blending a conventionally known foaming agent with polypropylene to form a film, which is heated to a temperature higher than the decomposition temperature of the foaming agent. Bubbles can be formed.
Examples of the blowing agent include, but are not limited to, conventionally known ones such as azodicarbonamide and benzenesulfonyl hydrazide.
The thickness of the foamed polypropylene film is not particularly limited, but is preferably in the range of 50 to 150 μm.

Furthermore, at least a part of the unstretched polypropylene film heat-treated is subjected to a heat treatment on at least a part of the unstretched polypropylene film, for example, the central portion 42 of the tearable tape 4 extending in the male strip direction and the female strip direction, as shown in FIG. Then, it can be formed by cooling. The unstretched polypropylene film is easy to stretch, so it is inferior in tearing properties. However, when heat-treating such unstretched polypropylene, the stretch properties of the film can be changed by heating, and the film stretch is suppressed and the tearability is improved. It becomes possible.
The heat treatment may be carried out by heating for about 0.1 to 10 seconds at a temperature equal to or higher than the melting point of the unstretched polypropylene to be used.

(fastener)
The fastener of this invention can be shape | molded by joining a tearable tape to the fastener tape which consists of the male fastener tape and female fastener tape which were mentioned above.
The joining position of the tearable tape to the fastener tape is as described above. However, as a joining method, the joining surface of the fastener tape and the tearable tape are formed from the same kind of resin, and this is thermally bonded. It can be joined using an agent.
As the adhesive, thermosetting adhesives such as epoxy adhesives, phenol adhesives, urethane adhesives, acrylic adhesives and the like are preferable because they can withstand high-temperature and humid heat conditions such as retort sterilization. In the case of heat sterilization at a relatively low temperature such as boil sterilization, a hot melt adhesive can be used.

For example, in the embodiment in which the tearable tape is joined to the anti-occlusion surface of the fastener tape as shown in FIG. 1, the engagement of the male fastener tape 2 and the female fastener tape 3 is performed as shown in FIG. It can shape | mold by joining each lower flange part on the edge which the tearable tape opposes in the state which cancel | released and opened planarly.
Further, as shown in FIG. 6, the tearable tape is joined to the occlusal surfaces of the male fastener tape 2 and the female fastener tape 3, and the tearable tape 4 is connected to the male fastener tape lower end 25 and the female fastener tape lower end 35. 9, the male fastener tape 2 and the female fastener tape 3 and the female fastener tape lower end 25 and the female fastener tape are opened in a flat state with the occlusion of the male fastener tape 2 and the female fastener tape 3 open as shown in FIG. The tearable tape 4 can be installed on the lower end 35 and joined to the lower flange portions 23 and 33 of the male fastener tape 2 and the female fastener tape 3, respectively.

(Packaging bag)
In the packaging bag of the present invention, the fastener is on the inner side of the heat seal portion of the packaging bag formed by heat sealing the peripheral edge of the flexible film, and the tearable tape is on the inside of the packaging bag. It is joined to the inner surface of the packaging bag so as to be positioned, and a heat seal portion corresponding to the fastener joint is formed so as to be openable.

As a packaging bag to which the fastener of the present invention is applied, a conventionally known pouch such as a single layer film made of a thermoplastic resin, a laminate of these films, or a laminate of a thermoplastic resin film and a metal foil such as an aluminum foil, etc. It can be applied to all packaging bags used in flexible packaging bodies such as bags, etc., but at least the inner surface side to be joined to the fastener is made of the same kind of resin as the fastener, so that heat bonding is possible and the moldability is Although it is preferable from a point, of course, it can also join by an adhesive agent, and in that case, it is not this limitation.
In the present invention, from the viewpoint of heat resistance, it is preferable that at least the surface on the inner surface side is made of polypropylene or polyethylene.

The packaging bag of the present invention is formed by heat-sealing the peripheral edge of the flexible film. The fastener is located inside the heat-sealed part, and the tearable tape is located inside the packaging bag. Moreover, it can shape | mold integrally by joining the upper flange part of a fastener tape to the packaging bag inner surface.
In the heat seal portion where the fastener is installed, an easy-to-break scheduled opening portion for cutting and removing the heat seal portion is formed. The planned opening portion is preferably tearable, from the viewpoint of openability, and a uniaxial or biaxially stretched film may be used, and the outer surface of the film is slightly scratched to improve breakability. May be. Moreover, opening operation becomes easier by notching the edge part of the opening scheduled part of this packaging bag.

The shape of the packaging bag is not particularly limited, and may be formed by heat-sealing four sides of two flexible films, or may be a standing type packaging bag provided with a bottom. Furthermore, an opening for taking out contents such as a spout can be provided in the upper part or the lower part separately from the opening scheduled part in which the fastener of the present invention is formed.
Especially the packaging bag of this invention can be used conveniently for the packaging bag which uses enteral nutrient, a liquid food, etc. as a content. That is, in such contents, heat sterilization such as retort sterilization is essential, and since the contents may be used after being diluted with water or the like, according to the packaging bag of the present invention, After removing the fastener, releasing the fastener, injecting water, etc., resealing, suspending with the planned opening side as the upper part, using the contents from the spout formed on the opposite side of the planned opening part It becomes possible to do.

It is a sectional side view which shows an example of the fastener of this invention. It is a figure for demonstrating the packaging bag which applied the fastener of this invention to the flexible bag. It is a figure which shows opening operation of the packaging bag shown in FIG. It is a figure which shows opening operation of the packaging bag shown in FIG. It is a sectional side view which shows another example of the fastener of this invention. It is a sectional side view which shows another example of the fastener of this invention. It is a figure which shows an example of the tearable tape used for the fastener of this invention. It is a figure which shows the manufacturing method of the fastener shown in FIG. It is a figure which shows the manufacturing method of the fastener shown in FIG.

Explanation of symbols

1 fastener, 2 male fastener tape, 3 female fastener tape, 4 tearable tape, 5 flexible bag, 6 occlusal part, 7 space, 8 space, 21 male strip, 22 upper flange part, 23 lower flange part, 24 rib, 25 lower flange part lower end, 31 female strip, 32 upper flange part, 33 lower flange part, 34 rib, 35 lower flange part lower end, 42 center part, 51 flexible film, 52 heat seal part, 53 to be opened Department.

Claims (8)

  A fastener comprising a male fastener tape and a female fastener tape having a male strip and a female strip that can be engaged with each other, and flange portions formed on both sides of the male strip and the female strip, respectively. The fastener characterized by the flange parts used as the anti-opening side of a tape and a female type | mold fastener tape being connected with the tearable tape.   The fastener according to claim 1, wherein the fastener tape is made of a heat resistant resin and can be sterilized by heating.   The fastener according to claim 1 or 2, wherein at least a surface of the fastener tape to be joined to the tearable tape is made of polypropylene, and the tearable tape is made of a uniaxially stretched polypropylene film.   The fastener according to claim 1 or 2, wherein at least a surface of the fastener tape joined to the tearable tape is made of polypropylene, and the tearable tape is made of a biaxially stretched polypropylene film.   The fastener according to claim 1 or 2, wherein at least a surface of the fastener tape joined to the tearable tape is made of polypropylene, and the tearable tape is made of a foamed polypropylene film.   The fastener according to claim 1 or 2, wherein at least a surface of the fastener tape joined to the tearable tape is made of polypropylene, and the tearable tape is made of an unstretched polypropylene film obtained by heat-treating at least a part thereof.   The packaging bag formed by heat-sealing the peripheral part of a flexible film WHEREIN: The fastener in any one of Claims 1 thru | or 6 in which a tearable tape wraps in a part inside this heat-seal part. A packaging bag characterized in that it is joined to the inner surface of the packaging bag so as to be located on the inner side of the bag, and a heat seal portion corresponding to the fastener joint is formed to be openable.   The packaging bag according to claim 7, wherein the flexible bag and the fastener are made of a heat-resistant resin and can be sterilized by heating.

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