JPH03272837A - Water absorbing sheet for wrapping - Google Patents

Abstract

PURPOSE:To manufacture a sheet of high strength easy to handle by composing the same of a core material formed with laminated films used for powder on one face of pulp nonwoven cloth through high water absorbing resin powder, water permeating films laminated on the pulp nonwoven cloth side of the core material and waterproof films laminated on the side of film used for powder. CONSTITUTION:A water absorbing sheet for wrapping is composed of a core material 4 composed of films 3 used for powder laminated on one face of pulp nonwoven cloth 1 through high water absorbing resin powder 2, water permeating films 5 laminated on the side of pulp nonwoven cloth 1 of said core material 4 and waterproof films 6 laminated on the side of the films 3 used for powder of the core material 4. Respective layers are integrated by laminating to prevent respective layers from sliding each other to increase the strength of the whole of the sheet. The pulp nonwoven cloth 1 is nonwoven cloth of water permeating pulp fiber and paper for conventional use can be used. As for the high water absorbing resin powder 2, the powder composed of an acrylic polymer to which zeolite and starch are added is preferable. As for the film 3 used for powder, for example, a thermoplastic resin film such as polyethylene or the like for general use is used.

Description

[Detailed Description of the Invention] [Excluding use of L] The present invention is applicable to the packaging of foods that retain moisture, such as frozen meat and frozen fish Qa, which generate moisture upon thawing. This invention relates to a water absorbent sheet suitable for packaging.

F. Conventional Technology] Super water-absorbing resin powder has been used as a water-absorbing sheet for packaging that absorbs the water that is produced when frozen meat, frozen fish and shellfish, etc. are thawed to maintain freshness and flavor as well as improve preservability. The core material is sandwiched between pieces of paper, one side of which is covered with a waterproof film, the other side covered with a nonwoven fabric, and the periphery of the waterproof filter and nonwoven fabric are fused together.

The water-absorbent sheet for packaging described in 2 is used for packaging with the non-woven side facing the inner surface [1], and the non-woven fabric and core paper are interposed between L2
The super absorbent resin absorbs the moisture generated by the food,
Preventing the growth of bacteria that can easily occur in this water,
Deterioration of freshness and taste of food is caused by fat 1.1-, 1. , , it increases the retention property.

1 Problems to be Solved by the Invention] By the way, in the conventional water-absorbing sheet for packaging, the periphery is fused, but the inner layer is made up of three layers: a core, a non-woven fabric, and a water-fatty filler. It is.

Therefore, when packaging and handling, for example, 2 pieces of frozen beef, which weighs 5 to 7 kg and is quite sluggish, there is a problem that the packaging is weak in strength and difficult to handle.

In other words, when carrying a packaging device or a bulk food product, not only does slippage occur between the three layers, making it difficult to hold, but the slippage also causes uneven load on one of the layers, which can further cause the bag to tear. be.

The present invention has been made in view of the above conventional problems, and
The problem to be solved is to create a water absorbent sheet for packaging that is strong and easy to handle.

[σ] Means 1 To solve the above problem, the means taken in the present invention will be explained with reference to FIG. 1, which best represents the characteristics of the unexploded 1g+. Super absorbent resin powder 2 is sandwiched between one side of cloth 1 and a powder placement film 1, 3
This core 4 (7) is laminated to the nonwoven fabric 1 side of the core 4, the water permeable film 5 laminated to the valve nonwoven fabric 1 side, and the powder attaching film 3 side of the core 1.44 &: laminated ~ Water-absorbing sheet for packaging made from waterproof Noilmuro.
The first step is to configure the

1 Effect] In the present invention, the 1.4 calendar is laminated by lamination (・) because each layer is made into one piece. Therefore, slippage between each layer is prevented. ) towards strong electricity I-
An embodiment of the present invention will be described with reference to the drawings.

As shown in the first factor, this packaging water absorbent>-h is composed of a core material 4, water permeable films 5 and waterproof film 6 which are laminated seven times.

The core material 4 is made by laminating a film 3 for viewing powder on one side of a valve film with super absorbent resin powder 2 sandwiched therebetween.

The valve nonwoven fabric l is a nonwoven A3 valve fiber with water permeability.
Ordinary paper can be used, or it is preferable to use paper that has been crushed to be as water permeable (water absorbent) as possible, such as Japanese paper, chemical & fiber-containing valves, cell U-XlaM-containing valves, and non-woven fabrics for this valve. The thickness of 1 depends on the type of 7, but the basis weight is 10~200g/l,
stomach.

As the super water-absorbing resin powder 2, currently commercially available ones can be used. However, since it can obtain excellent water absorption performance as well as 9° removal performance, zeolite and acrylic products can be used. It is preferable to powder it by adding starch (CMC).1. stomach. In addition, it is preferable that the amount of addition is about 3 to 100 g/wound to obtain the necessary water absorbency. Furthermore, the particle size can be determined using powder-attached display film 3, which will be described later.
It is sufficient as long as it does not interfere with the laminate.

The powder attaching film 3 has no valve * IIj 1 '
-: In order to firmly adhere the water-absorbing resin powder 2 to the valve nonwoven fabric 1, for example, by fusion, a general thermoplastic resin film such as polyethylene is used. . That H level is jO~・4
It is preferable that it is about 0 uLa.

A water-permeable film 5 is laminated on the valve nonwoven 411 side of the core material 4 described in L. This water-permeable filter 5 may be made by, for example, adding a large number of small pores to a general thermal ljT plastic film (either an I!J layer film or a micro-layer film) or corona discharge treatment. A perforated film or a nonwoven fabric made of chemical fibers can be used. In the case of right hole Neulum (7), add theolide, an antibacterial enzyme that adsorbs annular ions, and '4 light.1. It is preferable to use the filler 1 made of thermoplastic resin because it provides a deodorizing effect and a sterilizing effect. Also, i1
- In the case of a hole film, it is preferable that there is a J'X size of 8 to 30 - L <, in the case of chemical fiber 0 m spring, 20 -
Preferably, the thickness is 60 g/side.

When the water-permeable films 5 are perforated films, this 6
Hole quill 1, core 4A417') Valve non-woven A] Inner side;
, ′, can be teninated by fusing.

In addition, a small hole is formed in the valve nonwoven fabric 1 side of the core material 4 with a shape of 1. −
Please refer to 1 for fusing the citrus oil containing citrus oil that is not hot.
It is also possible to create a perforated film by forming small holes in the film using Yunposu Ka2 or the like.

When the water permeable Noilum 5 is made of non-woven chemical fiber, $
As shown in Fig. 3, a thermoplastic synthetic resin film such as polyethylene film is sandwiched between the core material 4 and the valve non-woven material with adhesives P7 and 17, and the film can be laminated by the fusion strength of this film. can. In this case, water permeability can be maintained by forming a large number of small holes in the adhesive layer 7, for example, by embossing after lamination.

A waterproof film 6 is laminated on the powder attachment film 3 side of the core material 4. As this waterproof film 6, a general thermoprotective synthetic resin film such as a polyethylene film can be used, and is laminated, for example, by fusion bonding or the like. In addition, its thickness is 10~
Preferably, it is about 30 μs.

As shown in FIG. 2, the four circumferences of the water-absorbing sheet for packaging form a peripheral fused portion 8 in which water-permeable films 5 and waterproof films 6 laminated above and below the core material 4 are fused. ing. The fusion of the two can be performed, for example, by heat sealing or high frequency processing, and as shown in the figure, the powder attachment film 3 may be extended between the two, but the powder attachment film 3 It may also be directly fused without extending.

Although the above-mentioned fusion of the four circumferences is not essential, performing this fusion prevents the superabsorbent resin 2 from absorbing external moisture from the four circumferences and prevents each layer from peeling off from the four circumferences. This is preferable because it can be done.

The thickness (center part) of the water absorbent sheet for packaging is preferably about 0.5 to 3 cm in order to obtain good packaging workability. It is also possible to improve the strength and handleability by applying unevenness to the entire surface.

This water-absorbing sheet for packaging is used for packaging with the water-permeable film 5 side facing inside, and its size depends on the size of the item to be packaged, but for example, the weight is about 5 to 7 kg. When packaging frozen beef blocks, etc., the long side is 200 to 1000 mm and the short side is 100 to 750 mm.
Preferably, the shape is approximately rectangular.

When the present packaging water-absorbing sheet is used to package the product, water generated from the packaged object is absorbed by the superabsorbent resin powder 2 through the water-permeable films 5 and the pulp nonwoven fabric 1, and is removed from the package. The water absorbed by the superabsorbent resin powder 2 is blocked by the waterproof film 6, so that it does not seep out to the outside.

On the other hand, the super absorbent resin powder is firmly attached to the valve nonwoven fabric 1 by the powder attaching film 3, and
Since it is blocked by the pulp nonwoven fabric 1 and the water-permeable films 5, it will not adhere to the packaged item. Furthermore, since the pulp nonwoven fabric 1 does not come into direct contact with the packaged object due to the water-permeable films 5, the valve fibers will not adhere to the packaged object.

[Effects of the Invention] The present invention is as described above, and has the following effects.

(1) Since each layer is integrated by lamination, when holding a heavy packaged item wrapped with this water-absorbing packaging sheet, there will be no slippage between the layers, making it easy to hold and excellent in handling. .

(2) Since each layer is integrated by lamination, the load can be supported by all layers, and the load is not biased to any one layer, resulting in excellent strength.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a water-absorbing sheet for packaging according to an embodiment of the present invention, with a partial front view shown and the middle portion omitted; Fig. 2 is a perspective view of the water-absorbing sheet for packaging; and Fig. 3 is a water-permeable water-permeable sheet. FIG. 2 is a longitudinal cross-sectional view showing an example of a case where a nonwoven fabric made of chemical fibers is used as the adhesive film. 1: Pulp nonwoven fabric, 2: Super absorbent resin powder, 3: Powder attaching film, 4: Core material, 5: Water permeable films, 6:
Waterproof film, 7: Adhesive layer, 8: Peripheral fused portion.

Claims (1)

[Claims] 1) A core material in which a powder attachment film is laminated on one side of a pulp nonwoven fabric with super absorbent resin powder sandwiched between them, a water permeable film laminated on the pulp nonwoven fabric side of this core material, and a powder attachment film for the core material. A water-absorbent sheet for packaging, characterized in that it is comprised of a waterproof film laminated on the film side.