JPH02182138A - Fishing bait bag lined with water absorbing sheet - Google Patents

Abstract

PURPOSE:To obtain the subject fishing bait bag suitable for filling fishing baits requiring freezing and preserving by heat sealing a water absorbing sheet consisting of a specific water absorbing polymer composite material in a bag material made of a thermoplastic film. CONSTITUTION:The objective fishing bait bag, obtained by impregnating or applying a water-soluble ethylenically unsaturated monomer consisting of (meth) acrylic acid, etc., onto a heat sealable nonwoven fabric substrate, then polymerizing, crosslinking and drying the above-mentioned monomer under reduced pressure, providing a water absorbing sheet 4 consisting of a water absorbing polymer composite material and fixing the resultant water absorbing sheet 4 to the inner surface of bag materials 2 and 3 made of a thermoplastic film, such as film made of polyethylene or polyester, and capable of holding fishing baits in a suitable state.

Description

BACKGROUND OF THE INVENTION Technical Field The present invention relates to bags for filling and storing fishing bait. More specifically, the present invention provides a bag suitable for filling fishing bait that needs to be stored frozen, which absorbs free water (drip water) that seeps out from the bait when the frozen fishing bait is thawed. This relates to a fishing bait bag capable of holding bait in a suitable state.

BACKGROUND OF THE INVENTION Conventionally, frozen baits for fishing bait filled in bags have been commercially available, such as iris, krill, whitebait, and various types of wire-shaped baits.

These are easily deteriorated and rotten at room temperature.
It is common for the whole bag to be frozen before being distributed, preserved, or sold.

These frozen baits need to be thawed before they are actually used for fishing, but free water (
Drip water) often seeps out and deteriorates the food in the bag. In other words, the bait becomes watery, its strength decreases, it loses its shape, and the bait does not hold well, making it impossible to use relatively expensive bait properly.

For this reason, recently, fishing bait bags have been proposed in which a cut sheet of paper, cloth, non-woven fabric, etc. is enclosed as a water-absorbing material in the bag. Although such a cut sheet encapsulation has some effect in terms of absorbing free water, it cannot be said to be completely satisfactory. Conventional fishing bait bags, for example, often contain a large amount of water-absorbing material and are extremely bulky, since the water-absorbing material used does not have sufficient water-absorbing ability.

In addition, it is difficult to keep the cut sheet in contact with the surface of the food in the bag evenly and to seal it in the bag without damaging the consumer's impression, so it is difficult to do it continuously with an automatic machine, so conventionally it was done manually. It was often done.

Therefore, enclosing the cut sheet in this way
It is unsuitable for mass production and also poses a problem in terms of cost.

[Summary of the invention]

Summary The present invention uses a water-absorbing sheet made of a water-absorbing polymer composite obtained by polymerizing a super-absorbent resin on a non-woven fabric substrate as a water-absorbing material, and a thermoplastic film constituting the bag of a fishing bait bag. The present invention aims to provide a fishing bait bag in which the above-mentioned problems are solved by heat-sealing this highly water-absorbent sheet and integrating it in advance.

Therefore, the fishing bait bag according to the present invention has a high water absorbency obtained by impregnating or coating a water-soluble ethylenically unsaturated monomer on a heat-sealable nonwoven fabric substrate, and then polymerizing the water-soluble ethylenically unsaturated monomer. It is characterized in that a water absorbent sheet made of a molecular complex is fixed to the inner surface of a thermoplastic film bag material by heat sealing.

Effects The fishing bait bag according to the present invention is made by integrally manufacturing a water absorbent sheet and a thermoplastic film by heat sealing. The water-absorbing sheet used is a composite of a non-woven fabric base and a polymeric resin, so it has superior water-absorbing ability compared to conventional cut sheet materials such as paper, cloth, and non-woven fabric. Even if there is a large amount of free water (drip water), it can quickly absorb water. Therefore, the effect of preventing food deterioration is great.

Furthermore, since the water absorbent sheet is fixed to the inside of the bag by heat sealing, the water absorbent sheet will not shift or peel off. Therefore, the subsequent filling operation of food can be carried out casually or automatically by a machine. Furthermore, when the water-absorbing sheet is provided only on one side of the bait bag, the entirety of the bait (product) can be visually confirmed from the outside, so the product image (value) will not be degraded. In addition, the water-absorbent sheet itself can be manufactured and processed as a continuous roll sheet, and it can be layered with a thermoplastic film roll sheet and continuously heat-sealed and bag-formed, resulting in significant cost reductions. becomes possible. Furthermore, since the water-absorbing sheet is directly attached to the thermoplastic film used as the bag material by heat sealing, an additional effect is obtained in that the strength of the material is improved compared to the conventional method.

[Detailed description of the invention]

(1) Thermoplastic film The thermoplastic film used in the present invention is
Any material that can be heat-sealed can be used. Representative examples of such films include films made of polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyester, nylon, and copolymers thereof.

The film may have a laminated structure, and in that case, at least one side of the film may be heat-sealable.

(2) Water-absorbing sheet made of a water-absorbing polymer composite The water-absorbing sheet used in the present invention is an aqueous solution of ethylenically unsaturated heptadum, which is to be formed into a water-absorbing polymer, impregnated or coated onto a nonwoven fabric substrate. It consists of a water-absorbing polymer composite obtained by polymerization.

Specifically, the nonwoven fabric substrate to be coated is a nonwoven fabric obtained by various manufacturing methods such as spunbond, dry type, and wet type, and has a heat-sealable material or structure.

Typical examples of such nonwoven fabrics include polyethylene nonwoven fabrics, polypropylene based fabrics, polyvinyl chloride based fabrics, polyvinylidene chloride based fabrics, polyester based fabrics, and composite nonwoven fabrics of two or more of these types (blended fabrics, core-sheath fiber structures, laminated structures). ) can be mentioned.

(b) Water-soluble ethylenically unsaturated monomer The water-soluble ethylenically unsaturated monomer to be impregnated or applied to the nonwoven fabric substrate is
Any polymer may be used as long as it can be converted into a water-absorbing polymer and provides good water-absorbing performance after polymerization and drying.

Water-soluble monomers that provide such performance include carboxylic acids or (and) salts thereof, phosphoric acids or (and) as functional groups.
and) salts thereof, water-soluble ethylenically unsaturated monomers having groups derived from sulfonic acids or (and) salts thereof. Specific examples include (meth)acrylic acid or a salt thereof, vinylsulfonic acid or a salt thereof, vinylphosphonic acid or a salt thereof, and the like. Among these, (meth)acrylic acid (ie, acrylic acid or methacrylic acid) or a salt thereof is particularly preferred. The resulting polymer may be a homopolymer or copolymer of these monomers, or a graft polymer to starch or cellulose.

Furthermore, it is also possible to add crosslinking agents and additives to these monomers to improve absorption performance. As a crosslinking agent, methylene bisacrylamide, ethylene glycol di(meth)acrylate, polyethylene glycol di(meth)
Water-soluble polyfunctional ethylenically unsaturated monomers such as acrylates, polyglycidyl ethers such as ethylene glycol diglycidyl ether and polyethylene glycol diglycidyl ether, polyols such as glycerin and pentaerythritol, and polyamines such as ethylene diamine, etc. Water-soluble compounds having two or more functional groups that can react with functional groups such as acid, phosphoric acid, and sulfonic acid can be preferably used.

(c) Production of a water-absorbent sheet made of a water-absorbing polymer composite In order to apply an aqueous solution made of such monomers to a nonwoven fabric substrate, as long as the monomers are uniformly dispersed on the nonwoven fabric and can be polymerized, This can be done by any desired means or mode. One of the typical ways to do this is
This method involves impregnating a nonwoven fabric substrate or the like with an aqueous monomer solution or spraying the monomer aqueous solution onto a fibrous substrate or the like.

Note that the monomer aqueous solution may contain a small amount of a water-soluble organic solvent dissolved therein, if desired.

The step of polymerizing the homogeneously dispersed monomers on the fibrous or spongy substrate can also be any convenient step. A typical such method is through the action of a water-soluble radical polymerization initiator, specifically, adding the radical polymerization initiator to an aqueous monomer solution and allowing it to decompose on the nonwoven substrate. Alternatively, the radical polymerization initiator can be applied as a solution separate from the monomer evenly by spraying onto a nonwoven fabric substrate, etc. after the monomer aqueous solution has been applied, and then decomposed on the fibrous substrate, etc., or the radical polymerization initiator can be mixed with the monomer. It is applied as a separate solution to a fibrous substrate, etc., and the aqueous Hemotsummer solution is applied thereto uniformly by spraying, coating, etc. It goes without saying that the "radical polymerization initiator" here includes so-called redox systems, and when the monomer and radical polymerization initiator are present separately in the above, only one of the redox systems is present in the monomer. Needless to say, there are ways to do so. Another means of initiating polymerization is irradiation with high energy radiation.

The water-absorbing polymer composite thus obtained is usually dried by means such as hot air, microphone white waves, and infrared rays. If unreacted monomers, etc. remain in the composite, it is preferable to wash the composite with water or warm water prior to drying.

(3) Fishing Bait Bag A preferred example of the fishing bait bag according to the present invention is as shown in FIG. The fishing bait bag 1 shown in this specific example is composed of a thermoplastic film bag +A' 2, a thermoplastic film bag material 3, and a water absorbent sheet 4. This bag 413 is heat-sealed to the rental material 3 so that it becomes the inner surface, and this bag 413 and the bag material 2
and are heat-sealed on three sides to form a bag.

FIG. 2 shows the rental fee 2 used in the fishing bait bag 1 shown in FIG. This bag material 2 is attached to the bag material 3 (in some cases, a water absorbent sheet 4
) and is heat-sealed to form one side of the fishing bait bag according to the present invention.

FIG. 3 shows a bag material 3' used in the fishing bait bag 1 shown in FIG. In this figure, the water absorbent sheet 4 is adhered to the bag material 3 at a heat seal portion 6. Note that the water absorbent sheet 4 can also be provided on the entire surface of the bag material 3.

〔Example〕

Example 1 A 70 mol% neutralized potassium acrylate aqueous solution with a solid content of 63% by weight was prepared. A solution was prepared in which 0.4% by weight of N,N'-methylenebisacrylamide and 0.3% by weight of potassium persulfate were dissolved based on the potassium acrylate monomer. Polyester/polyethylene mixed spunbond, nonwoven fabric with a basis weight of 40 g/rd (
Elbes SO403WDO manufactured by Unitika Co., Ltd.) Thickness is 0
．． A 20 mm piece was uniformly impregnated with this aqueous solution so that the polymer basis weight was about 50 g/d.

The nonwoven fabric impregnated with this monomer was placed in an oven purged with nitrogen for 1 hour to polymerize and crosslink the monomer, and then dried under reduced pressure at 100°C to obtain a water absorbent sheet made of a water absorbent polymer composite. Ta.

Part of this water-absorbent sheet and a laminate film of polyester (PET) 12 μm thick/polyethylene (PE) 40 μm thick are heat-sealed to form the bag material for the intended fishing bait bag (the material that forms the back side of the bag). First, it was created (see Figure 3).

Next, the same laminate film (see FIG. 2) as used previously was prepared and used as a bag material (constituting the surface of the bag).

The above two types of rental materials were overlapped and sealed on three sides using a hot bar type human sealer to create the intended fishing bait bag (size 12 x 18 cm) (see Figure 1).

An appropriate amount of krill was placed in this bag, the opening at the top of the bag was sealed (see Figure 4), and the bag was placed in a -20°C freezer and left for 24 hours to freeze.

Thereafter, the bag was taken out and allowed to thaw naturally at outside temperature. After thawing, the bag was opened and the krill inside was taken out.

Results: The krill remained fresh and firm, almost unchanged from its original state before freezing. In addition, the drip water was evenly absorbed by the water-absorbing sheet inside the bag.

This indicates the bag material for the bag.

FIG. 4 is a top view of the fishing bait bag according to the present invention when filled with bait.

DESCRIPTION OF SYMBOLS 1... Fishing bait bag, 2.3... Bag material, 4... Water absorbent sheet, 5... Heat sealing part, 6... Heat sealing part, 7... Heat sealing planned part, 8 ... Fishing bait (krill).

Claims (1)

[Claims] A water-absorbing sheet made of a water-absorbing polymer composite obtained by impregnating or coating a water-soluble ethylenically unsaturated monomer on a heat-sealable nonwoven fabric substrate and then polymerizing the water-soluble ethylenically unsaturated monomer, A fishing bait bag characterized by being fixed to the inner surface of a thermoplastic film bag material by heat sealing.