JPH0851871A - Embossed fluororesin film for green house - Google Patents

Abstract

PURPOSE:To provide an embossed fluororesin film of which one surface is roughened with a specific size unevenness, thus can adjust the transmission of light, but does not permits through-viewing of inside of the green house without any adverse effect on the strength and weather resistance of the film. CONSTITUTION:A fluororesin film of 40-80mum thickness is embossed all over its one surface to form a roughened face in which the difference in the height of unevenness corresponds to 1/100-5/100 of the film thickness. This fluorine resin film is prepared by extruding a fluororesin film from T-die 1, passed through a space between a cooling roller 2 and an embossing roller 3 to effect embossing, further through cooling rollers 4, 5, then wound up around a drum W.

Description

Detailed Description of the Invention

[0001]

[Application] Fluorocarbon resin film with wrinkles for greenhouses.

[0002]

[Prior Art and its Problems] Conventional greenhouse films are made of transparent materials such as vinyl chloride and polyethylene, so that the amount of light passing therethrough cannot be adjusted, and the function of plant cultivation is adjusted. Had to install a screen curtain separately. Furthermore, since vinyl chloride, polyethylene and the like have insufficient weather resistance, they have a short life and require a great deal of trouble to replace them.

[0003]

Since conventionally used greenhouse films are transparent, the amount of light passing therethrough cannot be adjusted. In order to adjust the function of plant cultivation, a shielding screen or the like must be provided separately. did not become.

According to the present invention, an embossed rough surface, for example, a satin-finished rough surface is provided on a fluororesin film to diffusely reflect the sun's rays so that the inside of the greenhouse cannot be seen through.
Adjusting the amount of light transmission, and the strength of the fluororesin film,
The weather resistance is not impaired.

[0005]

[Technical Means] One surface is provided with an uneven rough surface so that the inside of a greenhouse cannot be seen through by diffusely reflecting sunlight, and the unevenness of the uneven surface is 1/100 of the film thickness.
A fluorinated resin film with a wrinkle for a molded greenhouse, characterized by being from 5 to 100.

[0006]

[Function] Since the rough surface irregularly reflects the light from the outside so that the inside of the greenhouse cannot be seen through from the outside, privacy can be maintained and the strength of the fluororesin film can be improved by providing the rough uneven surface minutely. , Does not impair the weather resistance.

[0007]

EXAMPLES Examples of the present invention will be described below.
In FIG. 1, the fluororesin extruded from the T die 1 becomes a film and is drawn out and wound by the take-up cooling roll 2, the embossing / take-up roll 3, the cooling rolls 4 and 5, and the take-up roll 6 while being cooled. It is wound around the take-up drum W.

As a result, a rough surface is formed on one surface of the fluororesin film f. At the time of use, the fluororesin film f of the present invention is stretched over the greenhouse structure material with the roughened surface as the inside. The rough surface has a matte surface, a fine mesh shape, and an at random fine uneven shape. Then, the roughened rough surface hardly reduces the strength of the fluororesin film f,
In addition, it is required that it has a degree of unevenness that diffusely reflects sunlight and cannot see through the greenhouse from the outside. Therefore, by using the fluororesin film f of the present invention, privacy can be maintained and it is possible to prevent direct light from hitting the growth of plants.

[0009] Also, when the drop accelerating agent is applied to the inner surface of the greenhouse, there is an advantage that it is easy to apply due to the presence of the uneven rough surface. Also, no shielding curtain is required. The difference in the height of the unevenness of the rough surface is preferably 1/100 to 5/100 of the film thickness when the film thickness is 40-80 microns.

Further, one unit of the unevenness of the rough surface is 0.08 in length and width when the film thickness is 40-80 microns.
It is desirable to be 1 to 0.05 micron. If the unevenness is smaller than these values, irregular reflection does not occur, and conversely, if it is large, irregular reflection sharply decreases. Ideally, the roughened surface should be spread over the entire surface of the film. If UV suppression is required, apply a UV absorber on the rough surface.

The fluororesin film is appropriately selected from those shown in Table 1, and ethylene-4 fluoroethylene copolymer resin ETFE and tetrafluoroethylene-fluoroalkylvinyl ether copolymer resin PFA are considered to be particularly suitable.

[Table 1]

By the way, Table 2 shows the results of testing the decrease in the tension of a 40-micron-thick fluororesin film by changing the height difference of the rough surface of the rough surface.

[Table 2] It is separated from Table 2 that the tension cannot withstand use when the height difference exceeds 5/100. 2a shows a matte surface, FIG. 2b shows a mesh shape, and FIG. 2c shows a rough surface of an at random minute uneven surface. The uneven rough surface is formed in an arbitrary shape.

[0013]

【effect】

a. Since the minute uneven rough surface is provided on one surface of the fluororesin film, it is possible to simultaneously perform daylighting and shielding in the greenhouse within a range in which the strength of the film f is not weakened.

B. The fluororesin film f originally has good weather resistance even if a roughened surface is formed, so that the weather resistance does not drop sharply. Therefore, the fluororesin film f of the present invention can have strength, weather resistance, daylighting property, and diffuse reflection of light rays.

[Brief description of drawings]

FIG. 1 is an explanatory view of a method for producing a film of the present invention,

2A, 2B, 2C and 2D show several examples of the shape of a rough surface having irregularities.

[Explanation of symbols]

1: T die 2: take-back cooling roll, 3: embossing / take-off roll, 4,5: cooling roll, 6: take-up roll,
W: winding roll, f: fluororesin film.

Claims (3)

[Claims] 1. An uneven rough surface is provided on one entire surface of a fluororesin film having a thickness of 40 to 80 μm so that the inside of a greenhouse cannot be seen through by diffusely reflecting sunlight. The difference in thickness is 1/100 to 5 of the film thickness
Fluorine resin film with a wrinkle for greenhouses, which is / 100. 2. An ethylene-4 fluoroethylene copolymer resin or a tetrafluoroethylene-fluoroalkyl vinyl ether copolymer resin is used as the fluororesin.
The described fluororesin film. 3. When the film thickness is 40 to 80 μm, the vertical and horizontal length of one unit of the unevenness is 0.01 to 0.
The fluororesin film according to claim 1 or 2, which has a thickness of 05 microns.