JPS63294716A - Plant packing sheet - Google Patents

Abstract

PURPOSE:To enhance water holding ability and prevent drying, by fixing a water absorbing composite material prepared by applying a water absorbing polymer to a fibrous or spongy substrate between two sheets in which at least one thereof is permeable to water. CONSTITUTION:Water absorbing composite materials 2 consisting of a fibrous or spongy substrate and a water absorbing polymer are fixed between a water- permeable sheet 3 and water-permeable or water-impermeable sheet 4 with heat sealing parts 5 to form a plant packing sheet 1. A nursery stock 6 is placed on almost the central part of the plant packing sheet 1 previously kept in a hydrous state and the root part is wrapped therein and bound with an elastic cord 7, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] Technical Field The present invention relates to a plant packaging sheet. For more details,
The present invention relates to a plant packing sheet that prevents and protects the roots of plants from drying out when transplanting the plants.

Conventional Technology In the fields of forestry and agriculture and horticulture, when seedlings are removed from the nursery bed and transported or temporarily stored, it is necessary to protect the roots, especially the hairy roots, and to prevent soil attached to the roots from falling off. There is. For this reason, it has traditionally been done to cover the roots with insects or ropes. It is also widely practiced to cover the roots with sphagnum moss to prevent the roots from drying out, or to use coco as an outer cloth and put moisture-absorbing rice hulls, cut straw, sphagnum moss, etc. inside, and then pack the roots together with the roots. ing.

Then, such seedlings are packaged with their roots together,
When temporarily stored at a transplant site, it is sometimes immersed in a stream, pond, etc. near the site to prevent the roots from drying out.

However, sphagnum moss is expensive, and materials for moss, straw, rope, and rice husk are difficult to obtain stably due to changes in agricultural conditions in recent years. Also, immersing in streams, ponds, etc. will place restrictions on the location during planting work.

In addition, these operations require considerable skill and labor, are inefficient, and tend to vary in effectiveness.

[Summary of the invention]

Summary The present inventors have found that the above-mentioned problems can be solved by using a water-absorbing polymer formed by adhering a water-absorbing polymer to a fibrous substrate or a sponge-like substrate as a water-retaining material as a packaging material.

That is, in the plant packing sheet of the present invention, a water-absorbing polymer formed by adhering a water-absorbing polymer to a fibrous substrate or a sponge-like substrate is placed between two sheets, at least one of which is water permeable, or between two sheets, at least one of which is water permeable. It is fixed to both sides or one side of the seat.

Effects The plant packing sheet according to the present invention has a high water retention capacity per unit volume, so it has a high ability to prevent plants from drying out, and the packing and unpacking of plants can be carried out easily and efficiently. It has remarkable features in that it can be produced in a number of ways.

[Detailed description of the invention]

Plant Packing Sheet The plant packaging sheet of the present invention comprises a water-absorbing polymer that supplies water to plants, a fibrous base or sponge-like base to which the water-absorbing polymer is attached and held, and the water-absorbing polymer and the fibrous base or sponge. A sheet that supports or fixes a water-absorbing composite consisting of a shaped substrate and a water-absorbing composite, and protects plants, especially their roots, from drying out.

Therefore, water must be able to flow between the water-absorbing polymer or water-absorbing composite that substantially absorbs water and the plant.

That is, in the present invention, the sheet for fixing the water-absorbing composite may be provided only on the side of the water-absorbing composite that is not in contact with plants, and the sheet may be of a type that exhibits water permeability. If so, it can also be provided on the surface of the water-absorbing composite that comes into contact with plants. Moreover, the water-absorbing composite can also be fixed on both sides of one sheet.

In the present invention, the term "water-permeable sheet" refers not only to a sheet that exhibits water permeability over the entire surface, but also to one that exhibits water permeability in at least a portion of the sheet.

When a sheet for fixing the water-absorbing composite is provided on the surface of the water-absorbing composite that comes into contact with plants, this sheet must be water permeable, but in other cases, even if it is water permeable, It may be water-impermeable. Further, these sheets do not need to be made up of only a single sheet, but may be made up of a combination of a plurality of sheets.

Further, the method of fixing the water-absorbing composite to such a sheet can be any suitable means or mode.

Therefore, one specific example is to heat-seal sheets provided on both sides of the water-absorbing composite.

Fibrous Substrate or Sponge-like Substrate The fibrous substrate to which the water-absorbing polymer is attached and held is specifically formed by loosely molding fibers, such as batt, carded or air-laid web, tissue vapor, cotton gauze. woven fabric, knitted fabric, or non-woven fabric.

Here, a "formed" fibrous substrate means that cutting, joining, shaping, etc. may be necessary to incorporate the fibrous substrate into an article, but no further web forming operations are required. means something

It is generally preferred to use absorbent fibers, such as wood bulb, rayon, cotton, other cellulosic fibers, and/or polyester fibers as the main component in the fibrous substrate. However, other types of fibers, such as polyethylene, polybrobylene, polystyrene, polyamide, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polyurea, polyurethane, polyfluoroethylene The molded fibrous substrate may include fibers such as polycyanide, vinylidene polycyanide, and the like.

Further, the sponge-like substrate used in the present invention is a polymeric foam such as polyvinyl acetal sponge, rubber sponge, polyethylene foam, polypropylene foam, urethane foam, etc., and has a continuous network porous structure. Either is fine.

The main role of these fibrous substrates or sponge-like substrates is to retain the adhesion of water-absorbing polymers, but when this substrate is made of water-absorbing fibers as described above, they also function as water-retaining materials in the same way as water-absorbing polymers. also fulfill.

Water-absorbing composite The water-absorbing composite of the present invention is made by adhering a water-absorbing polymer to the above-mentioned fibrous substrate or sponge-like substrate. Here, "a product made by adhering a water-absorbing polymer to a fibrous base" refers to a product made by simply adhering a separately prepared water-absorbing polymer to a fibrous base or a sponge-like base by some means, as well as a product made by adhering a water-absorbing polymer prepared separately to a fibrous base The term also includes those in which the substrate is coated with or impregnated with a monomer that can be converted into a polymer, and the monomer is converted into a polymer and attached onto or in the substrate.

For example, in the latter case, the water-soluble monomer to be impregnated or applied to the fibrous substrate or sponge-like substrate may be any monomer 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 acid or (and) its salts, phosphoric acid or (
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 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 the crosslinking agent, water-soluble polyfunctional ethylenically unsaturated monomers such as methylene bisacrylamide, ethylene glycol di(meth)acrylate, and polyethylene fluoride di(meth)acrylate, ethylene glycol diglycidyl ether,
Polyglycidyl ethers such as polyethylene glycol diglycidyl ether, polyols such as glycerin and pentaerythritol, and polyamines such as ethylenediamine, which have two or more functional groups that can react with functional groups such as carboxylic acid, phosphoric acid, and sulfonic acid. Water-soluble compounds can be suitably used.

In order to apply a monomer aqueous solution to a fibrous substrate or a sponge-like substrate, the monomer is uniformly dispersed and maintained on the fibrous substrate;
As long as polymerization is possible, any suitable means or mode can be used. One typical means for this purpose is to impregnate the fibrous substrate or the like with an aqueous monomer solution or to spray the monomer aqueous solution onto the fibrous substrate or the like.

Further, the step of polymerizing the monomers uniformly dispersed on the fibrous substrate or the spongy substrate may be any suitable step. Typical of such methods is the action of a water-soluble radical polymerization initiator, specifically, adding the radical polymerization initiator to an aqueous monomer solution and decomposing it on the fibrous substrate. Alternatively, the radical polymerization initiator can be applied as a solution separate from the monomer evenly by spraying onto the fibrous substrate after the monomer aqueous solution has been applied, and the radical polymerization initiator can be decomposed on the fibrous substrate. A separate solution is applied to the fibrous substrate, and an aqueous solution of Hemotsuma is sprayed thereon.
It is applied uniformly by coating or the like. Another means of initiating polymerization is irradiation with high energy radiation.

The water-absorbing composite thus obtained is usually dried by means such as hot air, microwaves, 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.

Water-permeable sheet The water-permeable sheet used in the present invention may be, for example, a sufficiently fine-grained nonwoven fabric made of a thermoplastic material, or a thermoplastic sheet that has been made water-impermeable, with fine communication holes formed therein by electron beam irradiation or the like. Any appropriate purpose can be used, such as the one provided.

Note that this water-permeable sheet does not need to consist of only a single sheet; it may be laminated with other water-permeable sheets if the desired water permeability can be obtained in the end. Alternatively, other materials such as reinforcing materials, adhesives, etc. may be provided on the entire surface or a portion of the sheet.

Further, the water-permeable portion does not need to be the entire sheet surface, and may be only a portion that comes into contact with the roots of plants. There is no problem even if the portion not in contact with the roots is made of an impermeable sheet, such as a polyolefin sheet.

〔Example〕

A preferred embodiment and packaging example of the plant packaging sheet according to the present invention is as shown in the accompanying drawings.

1 and 2 show a cross section of the plant packing sheet 1. FIG. As shown in FIGS. 1 and 2, a water-absorbing composite 2 consisting of a fibrous substrate or a sponge-like substrate and a water-absorbing polymer is a water-permeable sheet (at least a portion of which is water-permeable) 3. and a water-permeable or water-impermeable sheet 4, which is fixed by a heat sealing part 5.

FIG. 3 shows the appearance of a single seedling after packaging using the plant packaging sheet of the present invention. To pack a single seedling in this way, place the seedling 6 almost in the center of the plant packing sheet 1, which has been preliminarily moistened, wrap the root of the seedling, and tie it with string, rubber, etc. 7 as shown in the figure. .

When packing seedlings in bulk, arrange the seedlings 6 on the plant packing sheet 1 as shown in Figure 4, wrap the seedlings with the plant packing sheet 1, and then wrap them with string, rubber, etc. 7.
By tying it up, it can be packed as shown in Figure 5.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 show a cross section of a preferred embodiment of the plant packing sheet according to the present invention. FIG. 3 shows the appearance of a single seedling packed using the plant packing sheet of the present invention. Diagram m4 shows the state before the seedlings are packed when the seedlings are packed together. FIG. 5 shows the appearance after packaging when seedlings are packed together. 1... Plant packing sheet, 2... Water-absorbing composite, 3.
... Water permeable sheet, 4... Water permeable or water impermeable sheet, 5... Adhesive part, 6... Seedling, 7... String or rubber. Applicant's agent Mr. Sato Figure 1 Figure 2 Figure 4 Figure 3 Slip drawing

Claims (1)

[Claims] 1. A water-absorbing composite formed by adhering a water-absorbing polymer to a fibrous substrate or a sponge-like substrate is placed between two sheets, at least one of which is water permeable, or between two sheets, at least one of which is water permeable. A plant packing sheet that is fixed to both sides or one side of the sheet. 2. The plant packaging sheet according to claim 1, wherein the water-absorbing polymer is obtained by polymerizing a water-soluble ethylenically unsaturated monomer. 3. After the water-absorbing composite is impregnated or coated with a water-soluble ethylenically unsaturated monomer on a fibrous substrate or a sponge-like substrate,
Any one of claims 1 to 2, which is obtained by polymerizing the water-soluble ethylenically unsaturated monomer.
Plant packing sheet as described in section.