JPH03180126A - Water-absorbing cloth for laver net - Google Patents

Abstract

PURPOSE:To improve workability on the preparation of a laver seed net without the generation of dusts and the injury of laver buds by employing a non-woven fabric containing water-absorbing fibers and thermally fusing fibers. CONSTITUTION:95-50% of water-absorbing fibers (e.g. PVA) each having a fineness of 2-30 denier and 5-50% of thermally fusing fibers (e.g. PP) each having a fineness of 2-30 denier are blended with each other and formed into an non- woven fabric having a weight of 30-250g/m<2>, a porosity of 99.5-50% and a thickness of 1-20mm. A water-absorbing cloth for laver nets comprises the non-woven fabric. The water-absorbing cloth is interposed between dehydrated seed nets, folded, placed in a bag for the laver net and subsequently frozen and stored for a long period at -15 to -35 deg.C after the closure of the opening of the bag, the seed nets being prepared by placing the laver spore-attached nets in sea water until the leaves of the laver grow to lengths of 0.5 to 100mm.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a freezing net for artificial cultivation of seaweed and its auxiliary materials.

[Conventional technology]

Natural seaweed cultivation continued for a long time, but as research into the ecology of seaweed progressed, the growth process of seaweed species was also clarified, and techniques for artificially harvesting seedlings and refrigerating seed nets were developed. This has greatly contributed to the stability of seaweed farming as an industry.

The challenge has always been to have a stable, high-quality seed net that can be staked out at any time depending on sea conditions, and to enable planned seaweed production by measuring the development and growth of the leaflets. The effectiveness of refrigeration was recognized, and freezing grid technology rapidly spread.

This frozen net is made by dehydrating the net with seaweed buds on it when the buds have grown to a suitable level (3 to 5 cm), then putting it in a polyethylene bag, sealing it, and freezing it in the refrigerator. It is stored at a low temperature, and when necessary, it can be taken out of the refrigerator and placed on fishing grounds to grow seaweed.

It has been found that the growth state of the seaweed thallus after freezing the net is greatly influenced by the method of refrigeration of the seed net and the method of freezing the net, and it has become known that this is due to the dehydration state of the seed net.

[Problem to be solved by the invention]

Normally, seaweed nets are dehydrated by centrifugation and then dried in the sun or by blowing air drying in indoor ventilation equipment, but this requires a tremendous amount of labor and depends on the climate at the time. be done. Also, if the time required is too long, the buds will swell after being staked out. In short, if dehydration is insufficient, the seaweed buds will be damaged by freezing, and after being put in the sea, the leaves will turn red and the growth of seaweed will be inhibited or stopped.

In order to improve these problems, some experts have devised various methods to further dehydrate the product after centrifugal dehydration or centrifugal dehydration and sun drying.

For example, dry soil, sand, rice husks, etc. between the folded nets.
This method involves sprinkling activated charcoal or sandwiching newspaper, measuring the excess water that will stick to the glue net, and dehydrating the retained water before placing it in the refrigerator.

However, these methods have poor workability and create a bad working environment, such as the generation of dust.Although it is temporary during the staking, it creates an oil film on the seawater, floating objects, and complaints from nearby residents that the seawater should not be polluted. In addition, red leaves tended to appear after stake-out, and the effect was not sufficient.

In order to solve these problems, the present inventors conducted repeated studies and tests, and as a result, they were able to completely solve the above problems.

That is, an object of the present invention is to provide a frozen preservation method for seaweed nets and a frozen net that provides good workability and a good working environment and is completely free from environmental pollution. The purpose is to provide water-absorbing fabric.

[Means to solve the problem]

The water-absorbing fabric for seaweed netting of the present invention has fibers with high water absorption of 95%.
~50%, 50~20% consisting of heat-fusible fibers 5~50%
It is characterized by being a nonwoven fabric of 0 g/mt.

The freezing net of the present invention has water-absorbing fibers of 95 to 95% in the seed net.
50%, 30-250 consisting of 5-50% heat-fusible fibers
It is characterized by intervening a water-absorbing fabric for seaweed netting made of non-woven fabric with a weight of 1.5 g/m.

The method of freezing and storing the seaweed seed net of the present invention involves dehydrating the seed net, and then containing 95 to 50% of water-absorbing fibers and 5 to 50% of heat-fusible fibers.
It is characterized by being folded with a water-absorbing fabric for seaweed net made of non-woven fabric of 50% to 200 g/m'' in weight.

The heat-fusible fibers used in the water absorbent fabric of the present invention include polypropylene, polyethylene, polyamide, polyester,
Any polyvinyl alcohol may be used as long as it is geothermally adhesive, and its fineness is preferably from 2 to 30 deniers.

The water-absorbent fibers of the water-absorbent fabric of the present invention may be any superabsorbent polymer that adsorbs and absorbs water when it comes into close contact with it. Among these, highly water-absorbent polymers such as starch, cellulose, polyacrylate, polyvinyl alcohol, polyacrylamide, and polyoxyethylene are particularly preferred. If the thickness of the fiber is too thick,
The rate of water absorption will be slow, and if it comes into contact with the glue net, it will become stiff and damage the glue buds. The fineness is preferably 2 to 30 deniers.

The nonwoven fabric related to the water absorbent fabric of the present invention has a weight of 30 to 250 g/
m 2 is preferable, more preferably 50 to 150
g/m''. Also, if the porosity is small, the contact area with the glue buds will be small and the rate of water absorption will be slowed down, so it should be in the range of 99.5 to 50%, preferably 99 to 90%. If the thickness is too thin, the water-absorbing fabric will tear, which is undesirable, so it should be about 1 to 20 mm, preferably about 5 to 15 mm.In addition, one or both sides of the water-absorbing fabric can be laminated with a non-woven fabric that allows only moisture to pass through efficiently. It may be.

In addition, there are no particular restrictions on the direction of the water-absorbing cloth, but when folding the seed net, it may be cut into the amount, size, and shape required at the work site depending on the size of the net, the size of the glue buds, or the condition of centrifugal dehydration. It is fine as long as the material is not falling apart at that time.

Regarding the method for freezing and storing seaweed nets of the present invention and the frozen nets, ropes with seaweed spores attached are placed in seawater with a leaf length of 0.5 to 100 kg.
The so-called seed net grown to 100 mm is dehydrated, folded with the water-absorbing cloth for seaweed net of the present invention interposed therebetween, placed in a seaweed net bag, sealed, and heated to 15"C to -35C, preferably -20C to A frozen net is obtained by storing frozen at -35°C for a long time.

The growth of seaweed leaves in the seed net is 0.5~5 in low temperature seawater.
50 ss, and 30 to 100 ss in warm ocean waters.

The method of dehydration is preferably a method that does not damage the length of the seaweed and can be carried out in a relatively short period of time, such as a centrifugal dehydrator or a dehydrator for seaweed. For example, the method of folding a seaweed net with a water-absorbing cloth interposed therebetween is usually a method of folding two 20m seaweed nets into 0.2 x 0.4 sheets.
Fold it to a size of 20 m x 0.5 m x 0.5 m x 0.5 m by interposing the water-absorbing fabric for seaweed netting of the present invention (0.5 parts 1 m to 0.7 x 3 m). Size.

The seaweed net bag to put this in is usually a polyethylene bag with a thickness of 0.1 to 0.25 mm, but it may be a container, bottle, or pipe that can be sealed so that the moisture contained in the seed net does not fluctuate.

〔Example〕

Attach seaweed spores to a seaweed net measuring 1.8 x 1.8 m.
It was grown in seawater to a leaf length of 3 to 5 cm. Three sheets of this seed net were folded up, placed in a centrifugal dehydrator, and centrifuged for 3 minutes.

Thereafter, a water-absorbing fabric made of non-woven fabric made of 70 g/m2 of highly water-absorbent acrylic fibers and 30 g/m2 of ethylene copolymer heat-fusible fibers was interposed and folded to 4 QcmX.
The size was 5 Qcm x 10cm.

This was placed in a 66COIX80CI11 polyethylene bag with a thickness of 0.2 mm, the mouth was tied, and the bag was immediately placed in a refrigerator and stored at -20 to -25°C for 30 days to make a frozen net.

This frozen mesh was tested in the following manner. A comparative test was similarly conducted and the results are shown in the table.

Here, workability refers to cases where there is pre-processing of dewatered materials, i.e. storage and adjustment of the amount used, × and cases where there is no ○
And so.

The working environment refers to the environment in which dust, etc., is generated in the work place.
Those that do not occur are marked as ○.

The amount of work is the weight of the object being handled (kg) x the working time (hours) associated with the work.
And so.

The above-mentioned super absorbent acrylic fiber is made by immersing 5 parts of acrylic fiber (90% acrylonitrile content, 3 denier) in 95 parts of a 30% aqueous sodium hydroxide solution, stirring for 40 minutes, heating and boiling to 115°C, and then washing with water. It was obtained by drying.

In addition, the ethylene copolymer heat-fusible fiber is made by extruding 1 part of vinyl acetate-ethylene copolymer with a vinyl acetate content of 5% and 1 part of polypropylene (flow rate = 10) using an extruder to produce a 5-denier fiber. I created it.

〔Effect of the invention〕

The effects of the water-absorbing cloth, frozen net, and frozen storage method of the present invention are as follows: 1. The water-absorbing cloth can be freely cut and used according to the size of the seaweed net used, so workability is good.

2. In the process of inserting water-absorbing cloth into the seed net and placing it in a seaweed bag, there is no dust generation as in the conventional method, and the work time is shortened.

3. When putting the frozen net into the sea, there were no floating objects in the seawater or on the sea surface.

4. By using the water-absorbing fabric of the present invention, the moisture attached to and retained by the seaweed buds on the seed net is rapidly absorbed, so the seaweed buds can be stored in an appropriate moisture content state without being damaged, so that the seaweed buds can be stored in a moderately hydrated state. The appearance of red buds has stopped.

5. The growth of the seaweed buds after spreading was extremely smooth, and the amount of harvested after 5 days was large.

Claims (1)

[Claims] 1) 95 to 50% water absorbing fibers, 5% heat-fusible fibers
A water-absorbing fabric for seaweed netting, characterized in that it is a nonwoven fabric with a weight of 50 to 200 g/m^2 consisting of ~50%. 2) The fiber with high water absorption is starch-based, cellulose-based,
The water absorbent fabric for seaweed according to claim 1, which is selected from polyacrylic acid-based, polyvinyl alcohol-based, and polyacrylamide-based fibers. 3) In the frozen net obtained by freezing and storing the seaweed seed net, the seed net contains 95 to 50% of water-absorbing fibers;
50-200g/m^ consisting of 5-50% heat-fusible fibers
1. A freezing net characterized by interposing a water-absorbing cloth for seaweed net made of the nonwoven fabric of item 2. 4) In a method of freezing and storing seaweed seed nets, after dehydrating the seed nets, a nonwoven fabric of 50 to 200 g/m^2 consisting of 95 to 50% water-absorbing fibers and 5 to 50% heat-fusible fibers is used. A method for freezing and storing seaweed seed nets, which is characterized by folding the seaweed seed nets with a water-absorbing cloth for the seaweed nets interposed therebetween. 5) The frozen storage method according to claim 4, wherein the method is folded and then placed in a bag.