JPS5849097Y2 - mulching film - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mulching film used for cultivating vegetables such as eggplants and tomatoes, fruits, red flowers, and plants.

In detail, it is a so-called mulching film that is made of a synthetic resin film such as vinyl chloride, polyethylene, or polypropylene, or a cloth-like material such as fiber cloth or non-woven fabric, which is tinged with a special pigment, and absorbs and blocks visible light in the sunlight, thereby preventing weeds, etc. To provide an agricultural mulching film which inhibits the germination and growth of cultivated plants, which inhibits the growth of cultivated plants, and which allows infrared rays to pass through to increase soil temperature and promote the germination and growth of cultivated plants.

It is clear that for plants to grow, it is better if there are no competing weeds around their roots, and it goes without saying that plants need to be supplied with appropriate amounts of light, water, and temperature for their growth. It's not worth it.

In recent years, cultivation using mulching films that cover the soil around the roots of cultivated plants has become popular.

Use a colorless and transparent mulching film to allow sunlight to pass through, raise the temperature of the soil, and increase heat retention to accelerate the growth of cultivated plants, or use a colored mulching film containing carbon black to inhibit the growth of cultivated plants. The aim is to promote the growth of cultivated plants by suppressing the growth of plants that inhibit the growth of plants, such as weeds.

However, none of the conventionally used mulching films has the above-mentioned two effects that are useful for the growth of cultivated plants, that is, suppressing inhibiting plants and increasing soil temperature and retaining heat.

In other words, the colorless and transparent ones allow all the light to pass through and help raise the soil temperature, but on the other hand, they also encourage the germination and growth of inhibiting plants, while the black ones absorb the light and transmit light to the seeds of inhibiting plants in the soil. However, since it also absorbs and blocks infrared rays, it has the disadvantage that it cannot maintain the temperature of the soil required by cultivated plants.

The present invention aims to solve the above-mentioned drawbacks.

That is, it eliminates the above-mentioned drawbacks of conventional mulching films,
The purpose of the present invention is to provide a mulching film that suppresses the growth of inhibiting plants and is also useful for keeping soil warm.

This invention uses a wavelength of approximately 380 mμ, which is necessary for plant germination and growth.
It absorbs light rays of ~700 mμ, but the wavelength is approximately 700 mμ.
We have developed a coloring agent that allows the above-mentioned light to pass through, and have successfully used it as a mulching film by dyeing or coating it on synthetic resin films, fiber cloths, and nonwoven fabrics.

The inventor proposed that light rays with wavelengths of approximately 380 mμ to 700 mμ are absorbed and do not penetrate into the soil, and light rays with wavelengths of approximately 700 mμ
Efforts were made to develop a coloring agent that would allow the above rays to pass through and raise soil temperature.

Focusing on the fact that blue cellophane paper, green cellophane paper, and red cellophane paper, which absorb visible light, each transmit infrared light, we stacked one sheet of each of these three colors of cellophane paper and investigated the state of light transmission. They discovered that even when three sheets of colored cellophane paper are laminated, light with a wavelength of approximately 700 mμ or more is transmitted.

In other words, if a coloring agent containing the three colors of blue, green, and red is mixed into the film, the wavelength range from 380 mμ to approximately 700 mμ, which promotes plant growth, can be mixed into the film.
The light rays of mμ are absorbed and blocked from penetrating into the soil, and at a distance of 700 m
It has been found that light having a wavelength of about 700 mμ or more can be transmitted and penetrated into the soil, raising the soil temperature.

The present inventor searched for a dye that cuts 700 mμ or less, and created Diamond Resin Green C (product name: Mitsubishi Chemical Corporation, Academic Salt C, 1,5oLv-ent Green).
3) and Oleosole Red BB (product name - manufactured by Sumitomo Chemical Co., Ltd., Academic Salt C0I, 5oLven)
t Red 24 ) or Sumiplast Green A (product name - manufactured by Sumitomo Chemical Co., Ltd. Scientific name C, I, S'
It has been developed that a desired spectral transmittance curve can be obtained by combining oLvent Green 3) and Oleosole Red BB (trade name - Sumitomo Chemical Co., Ltd. formula %) using a solvent cell method.

If you blend the above combination of Diamond Resin Green C and Oleosol Red BB or Sumiplast Green A and Oleosol Red BB with vinyl chloride to obtain a film and use it as a mulching film, you can control weeds etc. Although it suppresses the germination and growth of plants that are inhibiting growth, we succeeded in increasing the soil temperature and keeping it warm, which is necessary for cultivated plants.

In addition to vinyl chloride, the above-mentioned dye can be mixed into polyethylene, polypropylene, vinyl acetate, polyester resin, etc., and can also be dyed on textile fabrics and nonwoven fabrics.

The purpose can also be achieved by dissolving these dyes in a solvent and applying them.

That is, in the present invention, two types of colorants are used to absorb light rays with a wavelength of 380 mμ to about 700 mμ, but allow light rays with a wavelength of about 700 mμ or more to pass through a cloth-like material such as a synthetic resin film, fiber cloth, or nonwoven fabric. I, Solvent Red 24
It is an object of the present invention to provide an agricultural mulching film mixed with, dyed or coated with a colorant based on a combination of C, I, and Solvent Green 3.

The present invention will be explained below based on one illustrated example.

Dye diamond resin green C on vinyl chloride powder
A desired number of small holes 2 cm in diameter are formed in a vinyl chloride film obtained by combining and oleosol red BB by the solvent cell method.
A mulching film 1 in which small holes of 1, 22...2n are bored at equal intervals is spread on the surface of the cultivated soil 3, and 1, 4 of the soil portion 4 exposed by the small holes 2 are formed. of,·
...Sow seeds 5 or plant seedlings 6 in 4-n.

Seeds 5 and seedlings 6 germinate and grow by directly receiving sunlight and rainwater.

However, the mulching film 1 has a wavelength of 380 mμ to approximately 7
Since it absorbs light rays of 00 mμ, mulching film 1
In the part of the soil 3 covered with the mulching film 1, the growth of plants is suppressed, and therefore weeds other than the cultivated plants of the seeds 5 and seedlings 6 do not grow in the soil 3 covered with the mulching film 1.

- Mulching film 1 invented by a second-hand book has a wavelength of about 70
Since light rays of 0 mμ or more are transmitted, the temperature of the soil 3 covered with the mulching film 1 also increases due to the heat of the sun's rays, and heat retention is performed, which is necessary for the germination and growth of seeds 5 and seedlings 6. A sufficient temperature will be ensured.

Experimental Example 100 parts by weight of polyvinyl chloride, 47 parts by weight of dioctyl phthalate as a plasticizer, and 1 part by weight of calcium stearate as a stabilizer were added to 90 parts by weight of colorless soft vinyl chloride resin pellets (hereinafter simply referred to as PVC) and diamond resin. A masterbatch was prepared by blending 8 parts by weight of Green C (manufactured by Mitsubishi Chemical Co., Ltd.) and 2 parts by weight of Oleosol Red BB (manufactured by Sumitomo Chemical Co., Ltd.).

3 parts by weight of the obtained masterbatch was added to the colorless PVC10.
0 parts by weight and calendered to a thickness of 0.03 m.
A purple transparent film of size m was molded (product of the present invention).

As comparison samples, a green film produced using the above formulation without using oleosol red BB, a black film obtained by blending 24 parts by weight of carbon black with 100 parts by weight of PVC, and a colorless transparent film molded only from PVC were prepared.

Fields were covered with the various films mentioned above for about 30 days starting in mid-May, and the soil temperature and weed growth in the covered areas were examined. Table 1 shows the results.

As is clear from the results, the highest soil temperature was similar to that of conventional transparent films, and the lowest soil temperature was higher than the other films.

On the other hand, the weed prevention effect was equivalent to that of the black film.

By cultivating plants using the mulching film obtained by the present invention, not only can you expect the rapid growth of cultivated plants, which is the effect of conventional mulching films, but also there will be no weeds around the trunks of cultivated plants. The growth of competing plants is suppressed, and the soil has an excellent effect of increasing and retaining heat, and the healthy early cultivation of cultivated plants can be improved to a much higher level than in the past.

[Brief explanation of drawings]

Figure 1 shows a field using the mulching film of the present invention. FIG. 2 shows the A-A cross section of the above situation. 1...Mulching film of the present invention, 2...
...small hole, 3...field soil, 4...
・Exposed soil part, 5...Seed, 6...
Seedlings.

Claims (1)

[Scope of utility model registration request] Two types of colorants, Sea, Eye, and Solvent Red, are applied to a synthetic resin film, fiber cloth, nonwoven fabric, or other fabric-like material so that it absorbs light rays with a wavelength of about 380 mμ to about 700 mμ, but allows light rays with a wavelength of about 700 mμ or more to pass through. Agricultural mulching film mixed with, dyed or coated with a coloring agent made from a combination of 24, Sea, Eye, and Solvent Clean 3.