JP2918503B2 - Seeding and raising sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet for sowing and raising seedlings used for sowing and raising seedlings of vegetables, flowers and the like on a nursery bed. The present invention relates to a sheet for sowing and raising seedlings, which can be fixed at a strength that can be easily handled, and can contribute to labor saving of sowing and seeding of various vegetables and flowers without impairing germination.

[0002]

2. Description of the Related Art Conventionally, sowing work is generally performed by hand sowing. As a device devised for the purpose of labor saving of sowing work to date, a seed is dropped on a water-soluble film tape at intervals, twisted with a tape, and a string-shaped one including the seed inside. Seed tape in which an adhesive is applied on a seed tape or a water-soluble non-woven fabric, and seeds are dropped on the seed tape and fixed thereon are commercially available. However, in the case of a seed tape, since the seeds move when the tape is twisted, it is difficult to keep the seed interval at an appropriate distance, and in the case of seed paper, the falling position of the seeds is mechanically and finely controlled. It is difficult to achieve a close pattern of seeds,
There was a problem that the water solubility of the water-soluble nonwoven fabric was insufficient.

At present, the above-mentioned problems, namely, the shortage of seed spacing accuracy and the shortage of water solubility are solved, and it is possible to easily mount seeds of a predetermined number of grains at predetermined intervals.
Sowing and seedling raising sheets have been developed in which adhesive dots are provided at predetermined intervals on a water-soluble or water-dispersible support, and seeds are adhered and held on the adhesive dots. However, in the case of this sheet, since the purpose is not to firmly fix the seeds, the seeds easily fall off the sheet, and a large amount of seeds fall off when the sheets carrying the seeds are stacked and transported. There is a problem.

In recent years, as a countermeasure against the above-mentioned problem, that is, the seeds are likely to fall off from the sheet, a composite film comprising a water-soluble polymer such as polyvinyl alcohol and a water-soluble adhesive after the seeds are mounted on a sheet. A sheet for sowing and raising seedlings has been developed in which the sheet is covered from above with a seed, and the seed is fixed by laminating the film and the sheet. However, in this structure, the water solubility of the water-soluble adhesive may be deteriorated due to a chemical change over time, and it takes time to dissolve the sheet against watering on the nursery bed, sowing workability, germination property May be adversely affected.

[0005]

As described above, when a conventional seed-mounted sheet is used, sowing and raising seedlings can be saved depending on the purpose of use, but a wide variety of vegetables, flowers and the like are used. In contrast, seeds do not fall off during transportation or work, and a predetermined number of seeds can be mounted at a predetermined position, and do not adversely affect germination even by long-term storage, It was difficult to obtain a sheet having stable water solubility.

[0006] An object of the present invention is to solve the problems of the prior art described above, and to mount seeds at an arbitrary interval and an arbitrary number of grains at a strength such that they do not fall off during transportation or work. Moreover, it is an object of the present invention to provide a seeding and raising seedling sheet having excellent water solubility so as not to adversely affect the germination in the process of sowing and raising seedling even after a long storage period.

[0007]

Means for Solving the Problems In order to achieve the above object, the present invention is configured as described in the claims. That is, the present invention provides a point-like pressure-sensitive adhesive layer at a predetermined interval on the surface of a water-soluble or water-dispersible support, adheres and holds the seed on the pressure-sensitive adhesive layer, the surface, the seed A seeding and raising seedling sheet is characterized in that it is covered from above with a film of polyethylene glycol (hereinafter abbreviated as PEG), which is a kind of water-soluble polymer, and is adhered to the surface to fix seeds to the surface. I do.

The present invention also provides a sheet for seeding and raising according to claim 1, wherein the water-soluble polymer film is bonded to a water-soluble or water-dispersible support by heat sealing. Construct a nursery sheet.

Further, the present invention provides a sheet for seedling raising according to claim 2, wherein a heat-sealed portion of the water-soluble polymer film and the water-soluble or water-dispersible support is provided so as to surround the seed. A sheet for sowing and raising seedlings is provided.

[0010] The adhesion of the seed is performed by precisely applying a sticky adhesive capable of capturing the seed to a predetermined position on a support such as water-soluble paper and then sprinkling the seed on the support. It can be achieved at predetermined locations and at predetermined intervals. The pressure-sensitive adhesive applied to the water-soluble support can be applied in various forms such as linear and dotted, but among them, dotted coating is excellent in controlling the number of seeds loaded. ing. In the case of dot coating, an adhesive having a small area must be applied in an arbitrary shape and at an interval. In this case, screen printing is suitable. As the adhesive used for attaching the seeds, a commercially available adhesive can be arbitrarily selected and used, as long as it does not inhibit the germination of seeds and the growth of seedlings.

In the case where minute seeds are fixed one by one in one place, the amount of the adhesive per seed must be correspondingly small. As a result, the contact area between the seed and the adhesive becomes extremely small, and many of the seeds fall off during normal operation or transport operation.
Also, depending on the type of seed, there are some that are difficult to fix with a dot-shaped adhesive. Therefore, in such a case, fixing the seed by coating the seed with a water-soluble polymer film is a very effective means.

In order to fix the seed mounted on the support with the above water-soluble polymer film, a method of coating a sheet mounting the seed with a water-soluble polymer, There are a method in which a water-soluble pressure-sensitive adhesive or a water-soluble adhesive is thinly applied and bonded to a support, and a method in which a water-soluble polymer film is fused to the support by heat. In the case of a sheet coated with a water-soluble polymer film and a water-soluble pressure-sensitive adhesive, even if the water-solubility immediately after the preparation is good, the water-soluble pressure-sensitive adhesive may cause a decrease in solubility due to a chemical change over time, May cause a problem in the long-term storage stability of the product.

In the present invention, in order to solve the above-mentioned problems, PEG (for example, Daiichi Kogyo Seiyaku Co., Ltd.) is used as a material for a film to be laminated on a water-soluble or water-dispersible support.
Manufactured). In addition, the prepared sheet can hold the seeds so as not to fall off at an arbitrary interval and the number of grains, and furthermore, has excellent water solubility even after long-term storage, so that various kinds of vegetables, flowers, etc. In sowing and raising seedlings,
It can contribute to labor saving of seeding without impairing germination. The polyethylene glycol film can be fused to the support by applying pressure while being heated to a temperature not lower than the melting point (about 57 ° C.). There is no need to use.

As explained above, according to the present invention,
The seeds are mounted at an arbitrary interval and at an arbitrary number of grains so that they do not fall off during transportation or work.Moreover, even after a long storage period, they have a bad influence on germination during sowing and raising seedlings. It is possible to provide a seeding and seedling raising sheet having excellent water solubility.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the sheet for sowing and raising seedlings of the present invention will be specifically described with reference to examples.

First, commercially available polyethylene (hereinafter abbreviated as PE)
Film (thickness 35μm) and PEG film (thickness 10μm)
Was prepared. As a control, a polyvinyl alcohol (hereinafter abbreviated as PVA) film (thickness 10 μm)
A composite film of the film and a water-soluble adhesive film (thickness: 20 μm) was prepared.

As shown in FIG. 1, a commercially available water-soluble paper (280 mm × 58
(0 mm) 1 was printed with 220 acrylic adhesive dots 2 having a diameter of 0.3 mm by screen printing, and seeds 3 were sprinkled thereon, and one seed was mounted for each adhesive dot. The seed in this case is in the shape of a lens, and is drawn in a circular shape in the plan view of FIG. 1A and in a cross-sectional shape of the lens in the cross-sectional view of FIG. Next, a composite film of the prepared PE film 4 and PEG film 5 is covered over the entire surface of the water-soluble paper 1 on which the seeds are mounted.
After pressing and fusing the composite film and the water-soluble paper with an aluminum pressing die heated to
A sheet for sowing and raising seedlings capable of fixing seeds so as not to fall off during transportation or work was used.

Further, the change with time of the water solubility of the sheet of the present invention was examined. As a comparative example, a conventionally used sheet in which a composite film of the above PVA film (thickness: 10 μm) and a water-soluble pressure-sensitive adhesive film (thickness: 20 μm) was similarly laminated on water-soluble paper was used. After placing the above two types of sheets on the soil in a nursery box with water-soluble paper facing up, water was sprinkled using a watering can and the time from the time of water sprinkling until the sheet was completely dissolved was measured. The time from immediately after watering to complete dissolution of the sheet (30 seconds as one unit) was taken as the relative solubility, and the relationship between it and the storage period was determined and shown in FIG. The shorter the time required for the complete dissolution (vertical axis in FIG. 2), the better the solubility. From FIG. 2, it can be seen that the solubility immediately after preparation was 5 seconds in the sheet of the present invention and 5% in the sheet of the comparative example.
It turns out that it is 30 seconds. However, after 4 months, no change in the dissolution time was observed in the sheet of the present invention, whereas the solubility was reduced in the sheet of the comparative example, and a time difference of about 75 seconds occurred. Recognize. Also, as shown in Table 1, the amount of water used at the time of watering was changed according to the present invention.
The amount used in the case of the sheet was smaller than that in the case of the sheet of the comparative example.

[0019]

[Table 1]

[0020]

As described above, according to the present invention, seeds of a predetermined number of grains can be mounted at a predetermined position sufficiently firmly so that the seeds do not fall off during transportation or work, and can be used for a long time. Thus, a sheet for sowing and raising seedlings that maintains stable water solubility over a long period can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a schematic structure of a sheet and an example of sheet fusion according to the present invention.

FIG. 2 is a graph showing the effect of the storage period on the solubility of a sheet for sowing and raising seedlings.

[Explanation of symbols]

1 ... water-soluble paper, 2 ... adhesive dots, 3 ... seeds, 4 ... PE film, 5 ... PEG film, 6 ... fused part of PEG film and water-soluble paper, A ... position of vertical cross section.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A01C 1/04

Claims (3)

(57) [Claims] 1. A water-soluble or water-dispersible support is provided with a dot-like pressure-sensitive adhesive layer at predetermined intervals on a surface thereof, and seeds are adhered and held on the pressure-sensitive adhesive layer. Covering the seeds with a water-soluble polymer film, bonding the surface of the support to the water-soluble polymer film, and fixing the seeds on the support. A sheet for sowing and raising seedlings, wherein the molecular film is composed of a polyethylene glycol film. 2. The sheet for sowing and raising seedling according to claim 1, wherein the water-soluble polymer film is bonded to a water-soluble or water-dispersible support by heat sealing. . 3. The sheet for sowing and raising seedling according to claim 2, wherein the heat-sealed portion of the water-soluble polymer film is provided so as to surround the periphery of the seed.