JPH0728578B2 - Method for producing adhesive sheet for seeding and raising seedlings - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a pressure-sensitive adhesive sheet for seeding and raising used for seeding and raising seedlings of vegetables, flowers and the like,
In particular, the present invention relates to a novel method for producing a pressure-sensitive adhesive sheet for seeding and raising seedlings, which is capable of sowing seeds at a desired site with high position accuracy and efficiency and which is suitable for improving the workability of sowing.

[0002]

2. Description of the Related Art In recent years, in the cultivation of vegetables and flowers,
In order to efficiently grow a crop, a method has been widely used in which seeds are once sown on a nursery bed, the seedlings are raised, and after a certain period of time, the seedlings are planted in a field. Conventionally, the sowing work in this case was uneven in quality of seeds, so it took time and effort to sow seeds on a nursery bed in excess of the required amount, and after germination and seedling, leave high quality seedlings and remove other seedlings. Although such thinning work has been carried out, with the improvement of the quality of seeds, so-called spot sowing, in which seeds are sown in a required amount due to the improvement of germination rate, has come to be carried out. However, it takes a lot of time and effort to manually sow the seeds on the nursery beds.

In order to efficiently carry out the seeding work on the nursery bed in response to such problems, the present inventors have previously
We have proposed a pressure-sensitive adhesive sheet for seeding and raising seedlings, which comprises a water-soluble or water-dispersible sheet-like support and a dot-shaped or streak-shaped adhesive provided on the support (JP-A-1-296909).

[0004]

[Problems to be Solved by the Invention] However, vegetables,
The shape and size of seeds such as flowers are diverse,
In order to sow small seeds in spots, it is necessary to reduce the area of the dots of the adhesive on the adhesive sheet for seeding and raising seedlings. The printing method is generally used to apply the adhesive in the form of dots, but many commercially available materials that have been developed for such purposes are those prepared by diluting the adhesive with a solvent. When printing is applied using an adhesive, stringing is likely to occur and it is difficult to apply small-diameter dots. Further, in the case of coating with a water-dispersed pressure-sensitive adhesive, it is necessary to print the pressure-sensitive adhesive on release paper once, evaporate water to dry it, and then transfer it onto a support. Has a problem of the wettability of the adhesive to the release paper, and it is extremely difficult to uniformly apply the small dot adhesive to the release paper. Even when an adhesive solution with a low solid content concentration diluted with an organic solvent is used, the adhesive layer thickness is significantly larger than the printing thickness due to the volatilization disappearance of the solvent in the drying step after printing. As a result of the decrease, it became one of the factors that deteriorate the seed loading property.

The object of the present invention is to solve the problems of the above-mentioned prior art and to sow seeds at a desired site with high position accuracy and efficiently, and to improve the workability of sowing. It is intended to provide a novel method for producing a pressure-sensitive adhesive sheet for seeding and raising seedlings.

[0006]

The above object can be achieved by the following two manufacturing methods. That is, one method is to apply a radiation-crosslinking pressure-sensitive adhesive in spots on a water-soluble or water-dispersible sheet-like support and then irradiate it with radiation to promote crosslinking, thereby increasing the tackiness of the pressure-sensitive adhesive. Is a method of producing by expressing, other methods, after applying a radiation-crosslinking adhesive on the sheet-shaped support above the strip or the entire surface,
In this method, the dot-like site to be seeded is shielded and the other site is irradiated with radiation to lose the adhesiveness of the site.

[0007]

[Function] Most of radiation-crosslinking adhesives use monomers and oligomers with small molecular weight, do not contain a solvent, and are directly coated on a water-soluble or water-dispersible support, and ultraviolet rays, etc. By irradiating the above-mentioned radiation, the crosslinking can be promoted and the tackiness can be expressed or lost.

First, the first method will be briefly described. This method has almost no tackiness in the initial state. Therefore, it is a method of using a radiation-crosslinking adhesive that does not cause stringing at the time of coating. In this case, since there is no stringing at the time of coating, it is extremely easy to form microdots for microseed on the support. Can be formed. After the coating, radiation may be applied to accelerate crosslinking and develop the required adhesiveness.

The second method is a method of using a radiation-crosslinking adhesive having tackiness in the initial state. In this case, the radiation-crosslinking adhesive is coated on the support in a streak or whole surface. After working, mask the spots to be seeded,
By irradiating the other part with radiation to crosslink and cure the part, the tackiness of the part is lost, and as a result, a sheet having only the dot-shaped part having the tackiness can be obtained. In this case, it is possible to proceed with the work without worrying about the occurrence of stringing, which is a problem when directly applying the small dots by the first method.

Here, a little explanation of the radiation-crosslinking type pressure-sensitive adhesive, there are already many patent applications for this type of pressure-sensitive adhesive, and there are also many commercially available products, for example, "JELCON
AD UV-1 "(manufactured by Jujo Kako Co., Ltd.)," NS Tuck "series (manufactured by Hayakawa Rubber Co., Ltd.) and the like can be mentioned. Many of these are mixtures of non-reactive polymers with monomers and oligomers, and as the base polymer, many are conventionally used in the production of adhesives, for example, 2 ethylhexyl acrylate / vinyl acetate copolymer, ethylene / Examples thereof include vinyl acetate copolymers and vinyl ether copolymers. Further, the monomers and oligomers are mainly composed of acrylic acid ester and methacrylic acid ester.

The water-soluble or water-dispersible sheet material used as the support includes water-soluble film and water-soluble paper. Specifically, as the water-soluble film,
It can be made by sheeting water-soluble polyvinyl alcohol (PVA), but as commercial products using PVA as a material, "Hi-Selon" series (manufactured by Nigo Film Co., Ltd.), "Solvlon" series (Aicello Chemical Co., Ltd.
, Etc., and as the water-soluble paper, a `` dissolvo-WA '' series (manufactured by Mishima Paper Co., Ltd.) made of a mixture of fibrous water-soluble resin (for example, fibrous carboxymethyl cellulose) and wood pulp. Can be mentioned.

The pressure-sensitive adhesive sheet for seeding and raising seedlings using the above radiation-crosslinking pressure-sensitive adhesive can be applied to a support by patterning using a printing machine, and any printing method can be used.

The seeds are mounted on the pressure-sensitive adhesive sheet thus obtained by applying the seeds evenly on the pressure-sensitive adhesive surface of the pressure-sensitive adhesive sheet and then tilting the pressure-sensitive adhesive sheet. By removing the seeds in the parts other than the working part, it is possible to obtain a sheet in which the seeds are stuck only to the part coated with the adhesive. Also, put a large amount of seeds in a container of almost the same size as the pressure-sensitive adhesive sheet to be used, cover the seeds with the pressure-sensitive adhesive sheet with the pressure-sensitive adhesive coated surface facing downward,
By lightly pressing the pressure-sensitive adhesive sheet with a hand, a roller or the like, it is possible to obtain a sheet having a form in which seeds are attached only to the pressure-sensitive adhesive coated portion.

The materials, production methods and the like used for producing the pressure-sensitive adhesive sheet for seeding and raising of seedlings of the present invention have been described above, but nutrients for seeds, growth promoters, disinfectants and the like may be added to these materials and used. Of course it is possible.

Although the above description has been made for the pressure-sensitive adhesive sheet, it is needless to say that the same production is possible for a so-called tape-shaped material which is wound in the longitudinal direction and then unwound.

[0016]

EXAMPLES Hereinafter, the method for producing the sheet for seeding and raising seedlings of the present invention will be specifically described with reference to Examples.

[0017]

Example 1 FIG. 1 is a diagram for explaining one example of a method for producing a seedling-growing sheet of the present invention, (a) is a perspective view showing a schematic configuration of the seedling-growing sheet, and (b) is ( FIG. 7A is a vertical cross-sectional view taken along the line AA ′, and FIG. 7C is a view showing a state in which UV light is irradiated on FIG.

As a sheet manufacturing procedure, first, a sheet-shaped water-soluble paper 1 (trade name "Dissolvo-WA" (manufactured by Mishima Paper Co., Ltd.)) is coated with an ultraviolet-crosslinking adhesive which does not have tackiness in the initial state.
(Brand name “NS Tuck” (manufactured by Hayakawa Rubber Co., Ltd.)) 2 was printed in dots using a screen printing machine. In this case, since the pressure-sensitive adhesive did not have tackiness, there was no stringing and dot-like pattern coating was possible. Next, the pressure-sensitive adhesive 2 was cross-linked by irradiating the sheet with the pressure-sensitive adhesive coated surface thereof with ultraviolet rays 3 having an integrated light amount of 500 mJ / cm ² . As a result, the pressure-sensitive adhesive 2 was able to exhibit sufficient tackiness for sticking seeds.

FIG. 2 is a view showing a state in which one seed 4 is mounted on the pressure-sensitive adhesive 2 of FIG. 1 (c). In the case of this embodiment, eustoma seeds are mounted. It is sufficient to print the adhesive 2 in a circular shape with a diameter of about 0.3 mm in order to mount each one seed on the dot-shaped adhesive 2, and to install 2 to 3 seeds, it is necessary to print about a diameter of about 0.3 mm. It is sufficient to print it in a 0.5 mm circular shape.
Here, the time required to arrange a total of 299 seeds, one seed at one place at a pitch of 22 mm in each length and width on the culture soil put in the plug tray used for the production of plug seedlings, As a result of a comparison between the work and the case of spraying and sowing on the sheet of this example, the former required 15 minutes, while the latter required only 15 seconds.

[0020]

[Embodiment 2] FIG. 3 is a view for explaining another embodiment of the manufacturing method of the present invention, in which (a) is a partially enlarged perspective view of the manufacturing process,
(b) is a vertical cross-sectional view taken along the line BB 'of (a), showing a state where ultraviolet rays 3 are being irradiated.

As a procedure for producing the sheet, first, on the same water-soluble paper 1 as in Example 1, an ultraviolet-crosslinking adhesive having a tackiness in the initial state (trade name "Hayatone GB" (Hayakawa Rubber) is used.
5) was applied in a streak shape using a multi coater. Then, the coated surface is covered with an ultraviolet light-transmitting film 7 which has been previously shielded from light only at a portion 6 corresponding to a required spot-shaped adhesive surface portion, and an ultraviolet ray 3 having an integrated light amount of 750 mJ / cm ² is irradiated from the film surface. did. As a result, the cross-linking of the pressure-sensitive adhesive 8 in the portion other than the light-shielding portion 6 is promoted, the adhesiveness is lost, and the light-shielding portion 6
It was possible to obtain a sheet that retains the tackiness only in the portion corresponding to.

FIG. 4 is a view showing a state in which one seed is mounted on each dot-shaped adhesive portion of the adhesive sheet obtained by the above method.

[0023]

As described above, by using the method for producing a pressure-sensitive adhesive sheet for sowing and raising seedlings as the production method of the present invention, the problems possessed by the methods of the prior art can be solved and desired seeds can be obtained. Can be sown with high position accuracy and efficiency, and
It was possible to provide a method for producing a pressure-sensitive adhesive sheet for seeding and raising seedlings, which is suitable for improving workability of sowing.

[Brief description of drawings]

FIG. 1 is a diagram for explaining one embodiment of the manufacturing method of the present invention.

FIG. 2 is a vertical cross-sectional view showing a state in which seeds are mounted on the adhesive of FIG. 1 (c).

FIG. 3 is a view for explaining another embodiment of the manufacturing method of the present invention.

FIG. 4 is a vertical cross-sectional view showing a state where seeds are mounted on the adhesive of FIG.

[Explanation of symbols]

1 ... Support, 2 ... Radiation-crosslinking adhesive, 3 ... UV ray, 4
... Seeds, 5 ... Radiation cross-linking adhesive, 6 ... Light-shielding site, 7 ...
UV transparent film, 8 ... Adhesive curing part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eisho Kobayashi 3819 Noborito, Tama-ku, Kawasaki City, Kanagawa Prefecture Sliontech Co., Ltd. (72) Norimasa Kamezawa 3819 Noborito, Tama-ku, Kawasaki, Kanagawa Prefecture 56) References JP-A-61-205405 (JP, A)

Claims (2)

[Claims] 1. A method of applying the radiation-crosslinking pressure-sensitive adhesive in spots on a water-soluble or water-dispersible sheet-like support, and then irradiating the radiation to develop the tackiness of the pressure-sensitive adhesive. A method for producing a pressure-sensitive adhesive sheet for sowing and raising seedlings. 2. A water-soluble or water-dispersible sheet-shaped support is coated with a radiation-crosslinking pressure-sensitive adhesive in a streak shape or on the entire surface, and then dot-like portions to be seeded are shielded, and radiation is applied to other portions. A method for producing a pressure-sensitive adhesive sheet for seeding and raising seedlings, which comprises irradiating to lose the tackiness of the site.