JPH07135858A - Agricultural covering material having stripe - Google Patents

Abstract

PURPOSE:To provide an agricultural covering material to be stretched on an agricultural or horticultural facility such as tunnel, pipe and large-sized greenhouse and effective for transmitting light into the facility to uniformly apply the light to the plants in the facility by the light-spattering effect. CONSTITUTION:This covering material for agricultural use is a film made of a vinyl chloride based resin. At least one surface of the covering material is provided with a number of parallel ridge stripes having an angle relative to a side edge of the film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural covering material for spreading in agricultural and horticultural facilities such as tunnels, pipes and large-scale houses, and particularly to agriculture in which these agricultural and horticultural facilities are uniformly irradiated with light. For coating materials for automobiles.

[0002]

2. Description of the Related Art Conventionally, a covering material made of a soft polyvinyl chloride resin film has been spread over agricultural and horticultural facilities such as tunnels, pipes and large-sized houses to irradiate the agricultural products in these facilities with the sun rays that have passed through the covering material. Are used to grow agricultural products. Then, these agricultural coating materials use a soft film made of polyethylene, ethylene / vinyl acetate copolymer, polyvinyl chloride or the like, which is suitable for growth of agricultural products and allows transmission of wavelengths in the range of 600 nm to 700 nm. . However, according to the conventional agricultural covering material, light penetrates through the covering material and is applied to the agricultural work, but the light rays are not sufficiently irradiated to the lower part of the plant due to the mutual shielding effect between the plants. .

[0003]

Therefore, the present inventor has improved this point and increased the absolute amount of light energy that irradiates a plant by diffusing light incident on an agricultural and horticultural facility through a covering material. As a result of various examinations so that the growth of the plants can be carried out more effectively, the present invention has been completed, and the object of the present invention is to prevent the shielding effect between plants and to irradiate the lower parts of the plants sufficiently to achieve good growth. The present invention is to provide an agricultural coating material.

[0004]

The gist of the present invention is an agricultural coating material comprising a vinyl chloride resin film,
The agricultural covering material with a stripe is characterized in that at least one surface of the covering material is provided with a large number of parallel convex stripes having an angle with respect to a side edge of the film.

That is, the coating material of the present invention uniformly wets the inner surface of the film due to the temperature difference when the light rays in the morning and evening are weak. It grows by hitting, and since the film is not wet in the daytime, the light rays are transmitted through the film and scattered as a result of the strobe, and as a result, the light reduces the mutual shielding effect between plants and reaches the bottom of the plant enough. It will be irradiated, and the growth of plants will be promoted.

The present invention will be described in detail. The coating material in the present invention is a vinyl chloride resin which has been conventionally used, and is, for example, a polyvinyl chloride polymer or a vinyl chloride / vinyl acetate copolymer. It is preferable that these polymers are blended with a fluorescent dye that changes the wavelength to the wavelength most relevant to photosynthesis of plants. The film thickness of this film is about 50 to 200 μm.

In the present invention, a stripe is provided on at least one surface of such a covering material, and the cross-sectional shape of the stripe is shown in FIG. In FIG. 1, a is connected by a concave curve of R between the projections, b is a sine curve (sine curve), and c is connected by a convex curve of R between the projections. And d is a straight line connecting the protrusions, and e
Indicates one without a stripe. The cross-sectional shape of the stripe of the present invention is not limited to these four types, and other appropriate shapes may be used as long as the light rays transmitted through the film are scattered. These stripes are obtained by rolling the film with a rolling roll having grooves corresponding to the respective shapes.

The present invention requires that such a stripe is formed at an angle with respect to the side edge portion in the longitudinal direction of the film. Usually, this kind of agricultural coating covers agricultural and horticultural facilities at night, but in the daytime it rolls up the hem to prevent the temperature inside the facility from becoming excessively high, and at night the hem is re-covered. In the case of an agricultural covering material that is lowered to keep the inside of an agricultural and horticultural facility warm, it is a very important property that the hem can be easily rolled up or rolled down. This characteristic is usually called releasability or opening / closing workability. In the present invention, the angle with respect to the side edge is preferably within 40 °.

However, in the coating material of the present invention, by providing the stripes with an inclination angle with respect to the side edge portion in the longitudinal direction of the film, this separation property becomes good, and therefore workability becomes good. The angle with respect to the side edge in the longitudinal direction of the film is not particularly limited as long as it is an angle orthogonal to or close to the side edge. In producing the agricultural coating material according to the present invention, a compounding agent usually used,
For example, a plasticizer, a stabilizer, an antifogging agent, an antifog agent, a lubricant or the like may be added, and further, for example, a fluorescent pigment or the like may be added.

[0010]

EXAMPLES The present invention will be described below with reference to examples. Example 1 Vinyl chloride resin 100 parts by weight Plasticizer DOP 45 parts by weight TCP 5 parts by weight Composite stabilizer Ba-Zn soap 0.5 parts by weight Antifouling agent Methylenebisstearylamide 0.3 parts by weight Antifogging agent Sorbitan mono Palmitate 1.5 parts by weight After mixing the above components with a blender, they were kneaded with a Banbury mixer and fed to a calender to give a thickness of 10
A film having a thickness of 0 μm was formed and then rolled with a rolling roll having a predetermined groove to form a film having a stripe having an angle of about 30 ° on one surface.

Next, the film having the stripes was stretched in an agricultural and horticultural facility with the surface having the stripes as the inner surface, and the cross-sectional shape and the cultivating property, the resolving property and the tearing strength were examined. The measuring method is as follows. Yield ratio: A turnip was cultivated in Yoshida-cho, Haibara-gun, Shizuoka Prefecture, from May to August 1993, and the yield obtained for each case was calculated with the yield of type (e) being 1. Opening / closing workability: The ease of opening / closing work was evaluated in three stages. ○ Very good △ Good × not very good Tear strength: The tear strength was measured by the test method of JISK6732, and the tear strength in the lateral direction was displayed in three stages. ○ 1.2 kfg or more △ 1.0 to 1.2 kfg × 1.0 kfg or less Table 1 shows the measurement results.

[0012]

[Table 1]

From these results, the film having a stripe has an improved growth property, and particularly in the cases of ac, the film has good resolvability, but has a problem in tear strength. Next, the results of similarly measuring the fog growth property with the surface having the stripes on the outside and the flat surface on the inside are shown in Table 2 in comparison with the above results.

[0014]

[Table 2]

From the above results, it is possible to improve the growth of plants by providing a stripe on one surface, as compared with the case where both surfaces are flat. Particularly, the surface having the stripe is stretched toward the inside of the facility. In the case of doing so, the cultivating ability is improved by about 1.8% as compared with the case of facing the surface with the stripe outward.

[0016]

As described above, the present invention provides a plurality of parallel ridge stripes having an angle with respect to the side edges of the film on at least one surface of the vinyl chloride resin film agricultural coating material. By providing it, the light-scattering effect is generated, the growth of plants in the facility is improved, and the resolving property is improved, so that the workability is improved.

[Brief description of drawings]

FIG. 1 is a view showing a cross-sectional shape of a stripe of an agricultural covering material of the present invention.

Claims (1)

[Claims] 1. A covering material for agricultural use comprising a vinyl chloride resin film, wherein a plurality of parallel ridge stripes having an angle with respect to a side edge of the film are provided on at least one surface of the covering material. Agricultural covering material with a stripe.