JP2001061357A - Sunshade sheet and usage thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an agricultural sunshade sheet intended to surely block unnecessary sunlight and uniformize the reflection of incident light from the outside via the ground into a greenhouse to uniformly shine the interior of the greenhouse. SOLUTION: This sunshade sheet 5 e.g. for agricultural use is obtained by cutting, to an appropriate width, a silver-white laminated film prepared by forming a white layer on the vapor-deposited surface side of a vapor-deposited film, or the aluminum foil side of an aluminum foil-laminated film, followed by knitting/weaving the resultant silver-white tapes 1 as wefts or warps.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-shielding sheet used for agriculture and the like and an improvement in the method of using the same.

[0002]

2. Description of the Related Art At present, it is widely practiced to install a light-shielding sheet outside or inside a house in house cultivation. This is to prevent the crop from being exposed to excessive direct sunlight, especially heat rays (infrared rays). As the currently used agricultural light-shielding sheet, a silver-silver film in which a vapor-deposited film is laminated on both sides, a silver-black film in which a black film is laminated on the back of a vapor-deposited film, or a white nonwoven fabric is appropriately sized. And knitted, used for warp or weft, and knitted by kami, plain or raschel.

[0003]

By the way, even if a light shielding sheet is used, light from the outside enters the house. However, if the back surface of the light-shielding sheet is black, the dispersed reflection of the reflected light from the ground outside the house or the light that has passed through the light-shielding sheet from the ground outside the house is disturbed, and the inside of the house becomes too dark, The light amount becomes uneven. Further, if the back surface is also a vapor-deposited film, the light is reflected brilliantly and the uniformity of the light cannot be maintained. On the other hand, in the case of a white nonwoven fabric, there is a disadvantage that light from above is not sufficiently blocked.

[0004]

The present inventor has completed the present invention as a result of intensive studies in view of the above problems. That is, the light-shielding sheet of the present invention is stretched on the outside or inside of an agricultural house surrounded by vinyl film, sheet glass, or the like, and direct sunlight from above is reflected on the vapor deposition surface or the aluminum foil surface, while from the ground. Is characterized by being irregularly reflected by a white layer such as a white film or a white nonwoven fabric. With this configuration, the drawbacks of the conventional light-shielding sheet such as insufficient prevention of heat rays, too dark interior of the house, and uneven light quantity are eliminated.

In order to achieve this object, the light-shielding sheet of the present invention has the following configuration. First, a silver-white laminated film in which a white layer is provided on the vapor deposition surface side of a vapor deposition film or on the aluminum foil side of a foil film obtained by laminating an aluminum foil on the film is obtained. Then, this silver-white laminated film is cut into appropriate widths, and the obtained silver-white tape is used for wefts or warps, and is subjected to Russell knitting, Karami weaving, or plain weaving. As a material other than the silver-white tape, a monofilament yarn, a multifilament yarn, a general spun yarn, or the like is optionally used. In addition, a transparent tape obtained by cutting a transparent film into an appropriate width may be used by being mixed with the silver-white tape.

As the vapor-deposited film, a film deposited on a polyethylene terephthalate (PET) film is most preferable in view of physical properties such as strength, but other films such as OPP, nylon, and PE films can be used. . The thickness of the film is preferably 10 to 100 μm, particularly preferably about 12 to 25 μm.
In addition, although aluminum is usually used as a metal to be deposited, chromium, nickel, titanium, tin, silver, stainless steel, other metals and alloys can also be used. The thickness of the deposited film is about 200 to 1000 °, more preferably 300 to 1000 °.
600 °.

[0007] Instead of vapor deposition film, PET or other OP
A foil film in which an aluminum foil is bonded to a film of P, nylon, PE or the like may be used. The thickness of the aluminum foil is preferably 2 to 50 μm, particularly preferably about 7 to 30 μm. The bonding is usually performed by dry lamination.

As the white layer provided on the back side (deposition side) of the vapor-deposited film or on the foil side of the foil film, a white film or a white non-woven fabric obtained by dry lamination is used. PET, OPP, NY, and white film
A film in which a white pigment such as titanium white is kneaded with PE or the like is used. Alternatively, a white film may be printed on a transparent film. The thickness of the film used is 10 to
Those having a thickness of 100 μm, especially about 12 to 25 μm are preferably used. A PET film is most preferable in terms of physical properties such as strength. Instead of a white film, a white nonwoven fabric may be used. The thickness of the nonwoven fabric is 20 to 200 g / m ² (2
(About 0 to 200 μm) is used. When laminating a white film, a white paint may be applied in advance to the surface to be vapor-deposited or the surface of the aluminum foil, or a white pigment may be mixed in the adhesive paste.

The silver-white film thus obtained is cut into a suitable width to obtain a silver-white tape. The width of the silver-white tape is about 1 to 20 mm. Using this silver-white tape for the weft or warp, in combination with a monofilament yarn or a drawn or spun yarn of filament, Russell knitting,
Weaving into kami weave or plain weave. In the case of Russell knitting, it is preferable because the silver-white tape is not twisted or inverted.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments of the invention shown in the drawings. FIG. 1 is a perspective view showing an example of the silver-white tape 1 according to the present invention. This tape 1 is obtained by cutting the silver-white laminated film 2 shown in FIG. 2 into 8 mm. In the figure, reference numeral 21 denotes a 12 μm PET film, 22 denotes a 500 ° vapor deposition layer, 23 denotes an adhesive layer, and 24 denotes titanium white. Is a white hybron film having a thickness of 25 μm and containing 3 to 5%. Note that, instead of the silver-white laminated film 2, a silver-white laminated film 3 using an aluminum foil 25 having a thickness of about 10 μm instead of the vapor deposition layer 22 as shown in FIG. The silver-white tape 1 can also be obtained by using a silver-white laminated film 4 using a nonwoven fabric 26 having a thickness of about 100 μm instead of the hybron film 24 and similarly cutting the film into a suitable width.

FIG. 5 shows an example of a light-shielding sheet warp-knitted by a Russell knitting machine using the silver-white tape 1 shown in FIG. 1 and a polyester monofilament yarn having a thickness of 270 denier. That is, the light-shielding sheet 5 has silver-white tapes 1 each having a width of 8 mm arranged at an interval of 8 mm.
m), and weft-wound so as to cover the front and back of the silver-white tape 1 with polyester monofilament yarns 7 and 8. The light-shielding ratio is about 50%. The light blocking ratio can be changed by changing the width of the silver-white tape 1 and the interval between the tapes. In the light-shielding sheet 5 of the present embodiment, adjacent silver-white tapes 1 are bound with polyester monofilament threads 7, and light and air can freely pass therethrough. By inserting a transparent tape between the silver-white tapes 1, a light-shielding sheet having no air permeability can be produced.

FIG. 6 shows a state in which the light-shielding sheet 5 is hung on a greenhouse 9. In this case, the upper surface (outer surface) of the light-shielding sheet 5 becomes a vapor-deposited or foil-silvered surface that has passed through the transparent film, thereby preventing the house from being exposed to more than necessary solar heat rays. On the other hand, the lower surface (inner surface) of the light-shielding sheet 5 is white, and the light reflected on the ground inside and outside the house is irregularly reflected downward, and the whole is illuminated with uniform reflected light like a shade.

FIG. 7 shows a state in which the light-shielding sheet 5 is set inside a greenhouse 9 as in FIG. Also in this case, it is possible to cut off excess heat rays and uniformly illuminate the inner surface.

[0014]

As described above, the light-shielding sheet of the present invention has a structure in which the front surface is silver and the back surface is white. That is, a silver-white laminated film provided with a white layer on the vapor-deposited surface side of the vapor-deposited film or on the aluminum foil side of a foil film obtained by laminating an aluminum foil on the film is cut into appropriate widths, and the cut silver-white tape is used as a warp It is warped at appropriate intervals and woven by monofilament yarn or multifilament yarn by Russell knitting, plain weaving, kami weaving or the like.

Therefore, when used for covering a house, direct sunlight from above is reflected on the deposition surface or the aluminum foil surface, while light reflected from the ground is irregularly reflected on a white layer such as a white film or a white nonwoven fabric. Therefore, the drawbacks of the conventional light-shielding sheet such as insufficient prevention of heat rays, too dark interior of the house, and uneven light quantity are eliminated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a silver-white tape according to the present invention.

FIG. 2 is a sectional view showing an example of a silver-white laminated film.

FIG. 3 is a sectional view showing another example of the silver-white laminated film.

FIG. 4 is a cross-sectional view showing still another different example of the silver-white laminated film.

FIG. 5 is a perspective view showing an example of a light shielding sheet of the present invention.

FIG. 6 is a cross-sectional view showing a usage example of the light-shielding sheet of the present invention.

FIG. 7 is a cross-sectional view showing another example of use of the light-shielding sheet of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Silver-white tape 2 Silver-white laminated film 21 PET film 22 Evaporation layer 23 Adhesive layer 24 White hybron film 25 Aluminum foil 26 Non-woven fabric 3 Silver-white laminated film 4 Silver-white laminated film 5 Light-shielding sheet 6 Polyester monofilament thread 7 Polyester Monofilament yarn 8 Polyester monofilament yarn 9 Greenhouse

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiaki Hirohashi 3-784 Hongo, Kashiwara-shi, Osaka F-term in Nippon Wide Cross Co., Ltd. (reference) 2B024 DA01 DA02 DB01 DB07 2B029 EB03 EB08 EB15 EB21 EC03 EC12 EC15 LA01

Claims (3)

[Claims] 1. A silver-white laminated film having a white layer provided on a vapor-deposited surface side of a vapor-deposited film or an aluminum foil side of a foil film obtained by laminating an aluminum foil on the film, is cut into appropriate widths,
A light-shielding sheet characterized in that the cut silver-white tape is used as a weft or a warp, and is subjected to Russell knitting, Karami weaving, or plain weaving. 2. The light-shielding sheet according to claim 1, wherein the white layer is made of a white film or a white nonwoven fabric. 3. A light-shielding sheet formed by weaving a silver-white tape obtained by cutting a silver-white laminated film into a weft or a warp, and reflecting light from the ground with the silver surface facing upward so as to reflect sunlight and its radiant heat. Characterized in that the light-shielding sheet is stretched so that the white surface faces downward so as to diffusely reflect light.