JPH0516934Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] This invention relates to a film for cultivating moss moss. [Prior Art] In recent years, the so-called sticky mushroom cultivation method using films and nonwoven fabrics has become popular as one of the new cover cultivation methods using thermoplastic synthetic resin materials. In general, thermoplastic synthetic resin materials used for cultivation of moss mushrooms are required to have various properties, among which they are required to have excellent light transmittance and a certain degree of air permeability (moisture permeability), which are important checks. It has become a point. This is because if the light transmittance is good, the temperature raising effect is excellent, and if the air permeability is good, the overhumidity prevention effect is excellent, and both of them combine to provide an appropriate heat retention effect. Needless to say, the excellent temperature raising effect and moderate heat retention effect promote uniform germination and growth, and the over-humidity prevention effect makes it less susceptible to disease and frost damage. From this point of view, when we compare the performance of non-porous films made of low-density polyethylene, which are currently used as films for cultivating bedbugs, and non-woven fabrics made of polypropylene, polyethylene terephthalate, polyvinyl alcohol, etc., we find that non-porous films are ,
Good light transmittance and excellent temperature raising effect. However, there are problems with air permeability, the temperature becomes too high, the inside of the film becomes overly humid, and dew condenses easily on the inside of the film, so cultivated plants often die due to disease or frost damage. . On the other hand, non-woven fabric has better air permeability than non-porous resin film, and there are no problems with diseases or frost damage caused by excessive humidity, dew condensation, etc. However, although the air permeability is good, the light transmittance is poor, so the temperature raising or heat retention effect is poor. [Problem to be solved by the invention] This invention was made to solve these conventional problems, and it has excellent light transmittance and air permeability, and therefore has excellent temperature raising and heat retention effects. excellent,
It is an object of the present invention to provide a film for cultivating sticky moss that also has an overhumidity prevention effect. [Means for Solving the Problems] The film for cultivating sticky mushrooms according to this invention includes a thermoplastic resin film containing 2 to 15% by weight of a heat insulating agent, a colored resin film with an average transmittance of visible light of 50 to 85%, and Water droplet adhesion prevention agent 0.5-1.5% by weight
A light-transparent thermoplastic synthetic resin film selected from the contained thermoplastic resin film has an area of
2.0-20.0mm ² , preferably 0.3-10.0mm ² holes, 0.3
They are formed at a density of ~4.0 pieces/cm ² , preferably 0.4~2.0 pieces/cm ² . Materials for thermoplastic synthetic resin films In terms of price and performance (transparency, strength, durability, workability, etc.), polyolefin films such as low density polyethylene, high density polyethylene, and ethylene-propylene copolymer are preferred as resins. is suitable. The thickness of the film is preferably 5 to 30μ, and 10 to 30μ.
20μ is particularly preferred. If it is less than 5μ, it is difficult to mold.
Also, it will not be strong enough, and if it exceeds 30μ, it will become heavy.
This is because the price will also be higher. The heat-retaining agent is the heat-retaining property of the film for cultivating sticky mushrooms,
It is particularly effective in improving temperature retention at night. This type of heat insulating agent is an inorganic fine powder such as SiO ₂ , Al (OH) ₃ , Al ₂ O ₃ that has an infrared absorption peak at a wavelength of 7 to 15 μ and has an average particle size of about 5 μ or less. It is valid. The practical amount of addition is about 2 to 15% by weight. Colorants increase film temperature, improve daytime condensation, and are effective in blocking light under strong sunlight. Colorants include blue, red, white, black, etc., and have an average transmittance of approximately 50 to 85 in the visible region (wavelength 400 to 700 nm).
% can be used. The water droplet adhesion inhibitor is effective in reducing the adhesion of condensed water to the inner surface of the film. Usually, it is desirable to add higher fatty acid ester of polyhydric alcohol such as glycerin monostearate in an amount of 0.5 to 1.5% by weight. The reason why the pore area is set to 2.0 to 20.0 mm ² is because if it is less than 2.0 mm ² , the pore will be easily blocked by ^a water film caused by condensed water.
This is because, if the temperature exceeds 100°C, the air permeability becomes too large, which not only reduces the temperature-raising effect, but also often causes germinated young shoots to protrude through the holes. The density of pores is set to 0.3 to 4.0 pores/ ^cm2 , which means 0.3 pores/cm2.
This is because if it is less than 4.0 cm ² , dew condensation is likely to occur, and if it exceeds 4.0 pieces/cm ² , the temperature increasing effect is small, making it difficult to make holes, and the film strength is also reduced. The shape of the hole is circular, oval, square, rectangular,
Any shape such as a hexagon can be selected, and there is no particular limitation. However, a circular shape is preferable in terms of versatility, ease of processing, etc. Note that the average transmittance of benzotriazole-based, benzophenone-based, TiO ₂ , etc. at wavelengths of 290 to 400 nm is approximately
If the film contains 50% or less of an ultraviolet absorber, it is effective in promoting the elongation of stems and leaves. [Function] The film for cultivating moss moss according to this invention uses a light-transparent thermoplastic synthetic resin film, so it has good light transmittance. In particular, those containing a water droplet adhesion inhibitor have better light transmittance. Furthermore, since the film is provided with holes of a certain size and a certain density, appropriate air permeability can be obtained. In this way, since the light transmittance is improved, the temperature raising effect is also improved, and together with the appropriate air permeability, the heat retention effect is also improved. In particular, those containing a heat insulating agent have better heat retention effects. [Example] (Comparative Examples 1 to 8) Comparative Examples 1 to 8 were made using a transparent low-density polyethylene resin ("Yukalon" manufactured by Mitsubishi Yuka Co., Ltd.) shown in FIG.
LLF30F) A 20μ thick film 1 for cultivating sticky moss, in which circular holes 3 with an area shown in Table 1 are formed on the film 2 at a density shown in the same table, is placed in a greenhouse.
The film was placed over a ridge 100 cm long and 200 cm long, and the temperature inside the film and the adhesion of condensed water on the inside surface of the film were investigated. Temperature was determined using the average value for 7 days in January, and dew condensation was visually determined from 9 a.m. to 12 noon. Table 1 shows the results of the survey. (Examples 1 to 7) In Examples 1 to 6, the low density polyethylene used in the films of Comparative Examples 1 to 8 was used as a base material, additives were added in advance to form a film, and the following This is an example in which holes having the area shown in the table are provided at the density shown in the table. Examples 1 and 2 each use a polyethylene film to which 5% by weight of a heat insulating agent made of fine powder of SiO ₂ and Al(OH) ₃ with an average particle size of about 3 μm is added as an additive. Examples 3 and 4 are examples in which a polyethylene film was used in which a blue coloring agent was added as an additive to make the average transmittance in the visible region 75%. Examples 5 and 6 are examples in which films to which 0.7% by weight of a water droplet adhesion inhibitor (glycerin monostearate) was added as an additive were used. Example 7 is an example in which a film containing both a heat insulating agent and a water droplet adhesion inhibitor was used. (Comparative Examples 9 to 11) Comparative Example 9 is a case in which a film for cultivating sticky mushrooms is not covered, Comparative Example 10 is a case in which a conventionally used polypropylene nonwoven fabric is covered, and Comparative Example 11 is a case in which a conventionally used low density film is not covered. This is an example of a case where a non-porous polyethylene film is covered. Other conditions are the same as in the example. The temperature and the adhesion state of dew water are as shown in Table 1. (Comparative Examples 12 to 15) In Comparative Examples 12 to 15, the pore area and pore density of the low density polyethylene film of Comparative Example 1 were changed, and the other conditions were the same as in Comparative Example 1. As is clear from Table 1, in the example, the temperature inside the film was maintained at a maximum of 32.4°C and a minimum of 1.2°C, in the range of approximately 15.9 to 16.6°C on average, and there was no problem with the adhesion of condensed water. .

【table】

[Table] (Example of use) Next, we made a house film (100μ thick polyethylene film) using the film for cultivating sticky mushrooms (20μ thick) of this invention, the perforated polyethylene film (20μ thick) of the comparative example, and the polypropylene nonwoven fabric. This figure shows the results of cultivating turnips in a sticky bed (vinyl chloride film). Cultivation was carried out by sowing turnips in ridges 6 covered with mulching film 5 in house film 4, and covering them with film 1 for cultivating sticky moss, as shown in FIG. The cultivation conditions are as follows. (1) Gabu variety: Shirogane No. 2 (Mikado breeding) (2) Sowing: November 18, 1985: February 10, 1988 (3) Betagake period: Entire period from sowing to harvest (4) Ridge 6: Width 100cm, length 200cm (5) Film 1 for cultivating bedrock: Shown in Table 2 (6) House film 4: Made of polyvinyl chloride, thickness
100μ (7) Mulching film 5: Made of transparent low-density polyethylene, thickness 20μ (seeding hole diameter 43mm, plant spacing 15
cm) (8) Surveyed strains: 21 strains Table 2 shows the above cultivation results. In the table, leaf area is expressed as the product of leaf width and length, and is the average value of 13 to 16 expanded leaves. The leaf weight is the whole upper leaf weight. The table also shows the date when the root weight per plant exceeded 80.0g. As is clear from Table 2, cultivation using the film of the example is superior to the film of the comparative example, conventional non-woven fabric, and non-porous polyethylene film in terms of root weight and leaf area, and sufficient results can be obtained. . Furthermore, the period for growing crops that satisfy shipping standards can be shortened.

【table】

[Table] *2: Poor initial growth due to insufficient temperature [Effects of the invention] As explained above, according to this invention, a light-transparent thermoplastic synthetic resin film containing a heat insulating agent, a coloring agent, or a water droplet adhesion prevention agent Since holes with a certain area are provided at a certain density, we have created a film for cultivating bedrock that has good light transmittance and air permeability, has excellent temperature raising and heat retention effects, and has a good effect on preventing overhumidity. Obtainable.

[Brief explanation of drawings]

FIG. 1 is a plan view conceptually showing a film for cultivating moss moss according to an embodiment of the present invention, and FIG. 2 is a schematic front sectional view of the film shown in FIG. 1 in use. 1...Film for cultivating sticky mushrooms, 2...Thermoplastic synthetic resin film, 3...Hole, 4...House film, 5...Mulching film.

Claims (1)

[Scope of utility model registration request] Selected from a thermoplastic resin film containing 2 to 15% by weight of a heat insulating agent, a colored resin film with an average visible light transmittance of 50 to 85%, and a thermoplastic resin film containing 0.5 to 1.5% by weight of a water droplet adhesion prevention agent. A film for cultivating solid moss comprising a light-transparent thermoplastic synthetic resin film with holes having an area of 2.0 to 20.0 mm ² at a density of 0.3 to 4.0 pores/cm ² .