JP3514830B2 - Water-absorbent package and method for producing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-absorbent package in which a water-absorbent substance is sealed with a semipermeable membrane and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, in order to maintain the freshness of fresh foods, a sheet-shaped water absorbent body that combines a semipermeable membrane and a water-absorbing substance is brought into close contact with fresh foods during transportation, processing and storage to dehydrate water in the foods. Is being done.

As a method of using this, the above-mentioned sheet-shaped water-absorbing material is covered or wrapped around the outer periphery of the above-mentioned food so as to be adhered thereto, and then this is put into a plastic bag for transportation or storage of the food, and the plastic bag The open end of is sealed.

[0004]

However, in addition to the work of bringing the sheet-shaped water-absorbing material into close contact with the outer periphery of the food as described above, the work of putting the water-absorbing material in a plastic bag and sealing the opening end is troublesome and troublesome. Also, the cost was high.

The present invention has been made in view of the above problems, and an object thereof is to transport and process fresh foods by integrating a water absorbent body made of a semipermeable membrane and a water absorbent substance with a plastic bag. (EN) Provided are a water-absorbent package convenient for storage and a method for producing the same.

[0006]

In order to achieve the above object, in the water-absorbent package of the present invention, the opening of a tubular or bag-like package made of a thermoplastic resin film is heat-bonded, glued, or fastener. A water-absorbent package formed by integrally adhering a water-absorbent layer body formed by laminating a water-absorbent substance on a semipermeable membrane on a part or the whole of the inner surface of the package body by means of the like.
And the water-absorbing layered body and the first thermoplastic resin film
A second thermoplastic resin film made of the same kind of resin and the above
The water-absorbing substance is sandwiched between the semipermeable membrane,
The peripheral edge of the second thermoplastic resin film is heat
It is heat-sealed to the plastic resin film.

Further, in the method for producing a water-absorbent package of the present invention, a thermoplastic resin film is continuously supplied, and a water-absorbent body obtained by laminating a water-absorbent substance on a semipermeable membrane is supplied on the film. The water-absorbing substance is laminated so as to be positioned on the film side, the semipermeable membrane is adhered onto the film, and the film is formed into a tubular shape or a bag shape with the water absorbing body inside. .

In a more preferred method for producing a water-absorbent package of the present invention, a first thermoplastic resin film and a second thermoplastic resin film are prepared, and a semi-permeable membrane is coated with a water-absorbing substance. The water absorbent material is supplied onto the second thermoplastic resin film, and the water absorbent material is laminated so that the water absorbent substance is located on the second thermoplastic resin film side, and the semipermeable membrane is provided with the second thermoplastic resin. A water-absorbing layer body adhered to a film is prepared in advance, the second thermoplastic resin film is laminated on the first thermoplastic resin film, and then the first and second films are heated and pressed to be integrated. By heat fusion, and then the first thermoplastic resin film is formed into a tubular shape or a bag shape with the water absorbing layer body inside.

[0009]

When the water-absorbent package of the present invention is used, the opening of the package is opened and fresh food such as fish is put therein, and the water-absorbing layer inside the package is adhered to the food and the air inside the package is removed. The opening is sealed so that it can be pulled out. If this package is stored, for example, in a refrigerator, the moisture in the food will pass through the semipermeable membrane due to osmotic pressure into the water-absorbing substance, and the excess moisture in the fresh food will be dehydrated. , Keeps food fresh.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment in which a water-absorbent package according to the present invention is formed in a bag body. This bag body 1 is heat-sealed on three sides, and its upper and lower surfaces are shown in FIG. It has a four-layer structure. The outermost layer of the bag body 1 is composed of the first thermoplastic resin film 2, and the water absorption layer body 3 having a three-layer structure is integrally bonded to the inner surface thereof. This water absorbing layer body is formed by sealing the water absorbing substance 6 between the outer second thermoplastic resin film 4 and the inner semipermeable membrane 5. Further, band-shaped fasteners 7a and 7b, which are fitted in concave and convex in order to seal the bag body openably and closably, are integrally attached to the inner surface of the first thermoplastic resin film 2 at the open end of the bag body 1.

It is preferable to select the same kind of the above-mentioned first thermoplastic resin film 2 and the second thermoplastic resin film 4 because adhesion is easy. Therefore, for example, food packaging films such as polyvinyl chloride, polyethylene, polypropylene, polyethylene terephthalate, nylon, polycarbonate, polybutene-1, butadiene resin are suitable. In particular, low-density polyethylene, which is excellent in strength and flexibility at low temperatures, is suitable because foods are often stored frozen. Incidentally, although the oxygen permeability of the above-mentioned resin is low, even though it has oxygen permeability like polyethylene, since the semipermeable membrane and the water-absorbing substance are oxygen impermeable, Even if no special measures are taken, a package having low oxygen permeability as a whole can be obtained.

When an aliphatic polyester resin ("Bionole", a registered trademark of Showa Highpolymer Co., Ltd.) is used as the thermoplastic resin film, it has biodegradability and therefore has a biodegradability semipermeable property. By combining the membrane and the water-absorbing substance, the entire package of the present invention can be made biodegradable, which is preferable from the viewpoint of environmental protection.

When a combination of edible sugar, hydrophilic alcohol, water-soluble paste, etc. is used as the water-absorbing substance 5, even if the water-absorbing substance leaks, it is edible. It is suitable for

The semipermeable membrane 6 is preferably a thin film such as ordinary cellophane, a polyvinyl alcohol membrane, a cellulose acetate membrane, and a collodion membrane that selectively permeates a low molecular weight substance soluble in water and water.

Semipermeable membrane 6 and second thermoplastic resin film 4
Adhesion with, for example, polyurethane dry laminate adhesive or polyolefin adhesive, such as "Adtex"
(Registered trademark of Showa Denko KK) can be used to increase the adhesion efficiency.

In the above-mentioned embodiment, the band-shaped fastener 7 which is fitted in the concavo-convex is shown as a means for opening and closing the opening end of the bag body 1. However, other than this, a self-adhesive adhesive which can be repeatedly adhered and peeled. May be applied in place of the fastener, or may be attached with an adhesive provided with a release paper instead of the fastener, peel off the release paper at the time of use, it may be bonded with an adhesive, Alternatively, it may be sealed by heat fusion.

In order to form the bag body 1, the water absorbing layer body 3 having the three-layer structure is formed in advance, and the second thermoplastic resin film layer 4 in the water absorbing layer body 3 has a larger area than this. The first thermoplastic resin film layer 2 and the first thermoplastic resin film layer 2 are integrally bonded to each other by thermal bonding or the like to form a pair of sheet-like materials as shown in FIG. 3, and these sheet-like materials are superposed with the water absorbent body layer inside. The three sides should be heat-bonded.

In order to form the water absorbent layer 3 having the three-layer structure, as shown in Japanese Patent Application No. 6-98494 filed by the inventor of the present invention, a semipermeable membrane is used as a storage tank for storing a water absorbing substance. The water-absorbing substance is brought into contact with the upper surface of the semipermeable membrane by running along the lower surface, and extends in the direction crossing the running direction of the semipermeable membrane at the front end of the storage tank in front of the traveling direction of the semipermeable membrane. The scraper provided in contact with the upper surface of the semipermeable membrane or slightly separated from the upper surface of the semipermeable membrane, when the scraper is separated from the upper surface of the semipermeable membrane, the water-absorbing substance is applied to the upper surface of the semipermeable membrane, On the other hand, when the scraper comes into contact with the upper surface of the semipermeable membrane, the lower end of the scraper scrapes the water-absorbing material from the upper surface of the semipermeable membrane, so that the upper surface of the semipermeable membrane can be continuously conveyed while being conveyed. Separate and form multiple thin layers of water-absorbing material in a limited area While continuously transporting the semipermeable membrane, a film corresponding to the second thermoplastic resin film 2 of the present invention is continuously supplied from above the semipermeable membrane, and a film corresponding to the second thermoplastic resin film 2 is provided on the lower surface of the thermoplastic resin film. The adhesive is applied in a shape that does not overlap with the water-absorbing substance, the film is superposed on a semipermeable membrane, and the application part of the adhesive is intermittently applied to the semipermeable membrane by thermocompression bonding from its outer surface. The periphery of the water absorbing material is adhered and sealed by a thermoplastic resin film. The water-absorbing layer body thus formed is shown in FIGS. 4 and 5. In FIGS. 4 and 5, the width of the second thermoplastic film layer 4 in the widthwise direction is made slightly larger than the width of the semipermeable membrane 6.

The water-absorbing layer body 3 having the three-layer structure shown in FIGS. 4 and 5 is then bonded and integrated on the first thermoplastic resin film 2, and the first thermoplastic resin film 2 is preferable. Examples are shown in FIGS. 6 and 7. Band-shaped plastic fastener pieces 7a and 7b, which are fitted in a concavo-convex shape, are integrally heat-sealed at both ends in the lateral direction of the thermoplastic resin film along the longitudinal direction. The second thermoplastic resin film 4 of the water absorption layer body 3 having a three-layer structure is superposed on the first thermoplastic resin film 2. At this time, the three-layer structure is formed on the first thermoplastic resin film 2 in a state where the central portion between the adjacent water-absorbing materials of the water-absorbing layer body 3 shown in FIG. The second thermoplastic resin film 4 of the water absorption layer body 3 is stacked. At this time, the water absorbing layer body 3 should not cover the plastic fastener pieces 7a and 7b.
Next, the first thermoplastic resin film 2 and the second thermoplastic resin film are heat-sealed to each other by hot pressing from above the water-absorbing layer body 3 so as to surround the planar rectangular water-absorbing substance, and the heat-sealing is performed as shown in FIG. To obtain an intermediate laminate.

Next, the intermediate laminate of FIG. 8 is bent along the transverse line XX, and the first thermoplastic resin film 2 between the water-absorbing substances including the YY line in the longitudinal direction is further interposed between them. The package of the present invention can be efficiently manufactured by welding and then cutting along the line Y-Y.

An outline of an apparatus for efficiently producing the above-mentioned package is shown in FIG. First, as shown in FIG. 6, the first thermoplastic resin film 2 to which the plastic fasteners 7a and 7b are bonded in advance is provided on the roll 1 at the left end of the apparatus.
It is continuously drawn from 0 and sent to the conveyor 11,
A hot melt adhesive is applied to the upper surface of the film 2 by a hot melt applicator 12. Then, from the upper side of the apparatus, the water-absorbing layer body 3 having a three-layer structure formed in advance as described in the above-mentioned embodiment is pulled out from the roll 13 and cut and separated between the adjacent water-absorbing material layers 5 by the rotary cutter 14. It is supplied onto the second conveyor 15.
The second conveyor 15 is driven at a speed higher than the conveying speed of the water absorbing body layer pulled out from the roll 13, and the water absorbing layer bodies 3 separated by cutting are conveyed on the second conveyor with a relatively large distance from each other. And is fed through the guide 16 onto the first thermoplastic resin film. At this time, since the hot melt adhesive is applied on the first thermoplastic resin film, the water absorbing layer is temporarily fixed on the first film. Then, these are passed through the rotary heater 17, whereby the upper surface of the first thermoplastic resin film 2 and the lower surface of the second thermoplastic resin film 4 are formed in the vicinity of the insides of both plastic fastener pieces 7a, 7b. It is heat-sealed as shown in FIG. The thus heat-sealed material then passes through the half-folding triangular plate 18, and the X- line in FIG.
The plastic fasteners 7a and 7b are bent and bent along X, and then the nip roller 19 fits the plastic fasteners 7a and 7b to the rotary heater 20. In the rotary heater 20, the inner surfaces of the first thermoplastic resin film including the YY line in FIG. 8 are heat-sealed to each other, and then the first thermoplastic resin film is cut along the YY line by the cutter 21.
It is cut and separated by to obtain a bag of the final product.

Note that the present invention can be modified in various ways other than the above-described embodiments, and for example, as the water-absorbent package, a cylinder can be used instead of the bag. In this case, the sheet-shaped materials as shown in FIG. 3 are superposed with the water absorbent body layer side facing inward, and the opposite sides are bonded by heat fusion or the like. Then, the opening portions at both ends may be freely sealed with a plastic fastener, an adhesive agent, or the like, which is fitted in a concavo-convex manner as in the case of closing the opening portion of the bag body.

[0024]

[0025]

As described above, according to the water-absorbent package of the present invention, fresh food is inserted into the inside of the package through the opening, and when the opening is closed, the food is the same as the ordinary package. Is convenient for transportation, processing, and storage, and since water in the food is dehydrated during the storage, the storability can be significantly improved without impairing the taste of the food. Also the first
A thermoplastic resin film and a second thermoplastic resin film;
Since they are made of the same type of resin, they can be easily fused together.
It

Further, according to the method of the present invention, the water absorbent package can be manufactured extremely efficiently.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a water-absorbent package of the present invention formed in a bag shape.

2 is a cross-sectional view of the package of FIG.

FIG. 3 is a cross-sectional view of one surface member of the package of FIG. 1 before being bonded.

FIG. 4 is a plan view showing a water absorption layer body having a three-layer structure that is continuously formed and is used for manufacturing the packaging body of the present invention.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a plan view of a first thermoplastic resin film used for manufacturing the package of the present invention.

7 is a cross-sectional view of FIG.

FIG. 8 is a top view of FIG. 4 on the first thermoplastic resin film of FIG.
It is a top view showing the state where the water absorption layer body of was laminated.

FIG. 9 is an explanatory view showing the outline of an apparatus for carrying out the method of the present invention.

[Explanation of symbols]

1 bag 2 First thermoplastic resin film 3 Water absorption layer 4 Second thermoplastic resin film 5 Water-absorbing substance 6 semi-permeable membrane 7a, 7b Plastic fastener

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-2-57583 (JP, A) JP-A-5-23103 (JP, A) JP-A-4-265745 (JP, A) 114774 (JP, U) Actual development 2-67779 (JP, U) Actual development 3-45838 (JP, U) Actual development 1-222430 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B65D 81/00-81/26 B65D 33/01

Claims (3)

(57) [Claims] 1. A tubular or bag-shaped package made of a first thermoplastic resin film having an opening which can be sealed by thermal bonding, gluing, fasteners or the like, and a half or part of the inner surface of the package can be partially sealed. the water-absorbing layer body comprising a water absorbing material stacked in a water-absorbing package ing integrally attached to permeable membrane, said intake
The water layer body is the same kind of resin as the first thermoplastic resin film
Of a second thermoplastic resin film composed of the semipermeable membrane
The water absorbing material is sandwiched between the second heat absorbing material and the second heat absorbing material.
The peripheral edge portion of the plastic resin film is the first thermoplastic resin film.
Water-absorbent packaging characterized by being heat-sealed to a film
body. 2. A thermoplastic resin film is continuously supplied.
Then, a semi-permeable membrane is laminated with a water-absorbing substance on the film.
The water absorbent is supplied so that the water absorbing substance is located on the film side.
So that the semipermeable membrane is adhered onto the film,
The film is formed into a tube or bag with the water absorber inside.
A method for producing a water absorbent package, comprising: 3. A first thermoplastic resin film and a second thermoplastic resin film.
Prepare a thermoplastic resin film and absorb water in the semipermeable membrane
A water-absorbing material formed by applying a quality second thermoplastic resin film
And the water-absorbing substance is supplied onto the second thermoplastic resin layer.
The semipermeable membrane is laminated so that the semipermeable membrane is located on the film side.
The water-absorbing layer body adhered to the thermoplastic resin film of
And the second thermoplastic resin film is applied to the first heat-resistant film.
After being laminated on the plastic resin film, the first and second films are laminated.
By heat-pressing the rum, heat fusion is performed integrally,
Thereafter, the first thermoplastic resin film is attached to the water absorbing layer body.
It is characterized in that it is formed in the shape of a cylinder or bag inside
A method for producing a water-absorbent package.