Agricultural greenhouse, plant cultivation method using the same, and heat-ray reflecting film structure

Patent metadata

Field	Value
Publication number	US-11291167-B2
Application number	US-201716080379-A
Country	US
Kind code	B2
Filing date	Feb 13, 2017
Priority date	Feb 29, 2016
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

The agricultural greenhouse of the invention and the plant cultivation method using the same can cultivate plants economically and efficiently with less energy per crop yield, as it is provided with a CO2 supply means, a heat-ray shielding means, and a dehumidification and cooling means, the heat-ray shielding means is formed of using a heat-ray reflecting film, and plural through holes are formed in the heat-ray shielding means. The heat-ray reflecting film structure can cultivate plants by the agricultural greenhouse utilizing sunlight economically and efficiently as it has a structure that narrow band-shaped tapes obtained by cutting a multi-layer laminated film made by laminating at least two kinds of resin layers with different refractive indices alternately and having an average transmittance at 80% or more for visible light and an average reflectance at 70% or more for heat-ray is woven or knitted as a warp or a weft.

First claim

The invention claimed is:

1. A heat-ray reflecting film structure used for an agricultural greenhouse utilizing sunlight, wherein
the heat-ray reflecting film structure is formed of a woven or knitted fabric weaving or knitting a narrow band-shaped tape as a warp or a weft and a filament yarn or a spun yarn as a weft or a warp, wherein the narrow band-shaped tape is obtained by cutting an original film in which a lubricity-attached layer is provided on at least one surface of a multi-layer laminated film made by laminating at least two kinds of resin layers with different refractive indices alternately and having an average transmittance at 80% or more for light with wavelength of 400-750 nm and an average reflectance at 70% or more for light with wavelength of 800-1100 nm, and
a thickness of the filament yarn or the spun yarn is 0.01-0.30 times as thick as a width of the narrow band-shaped tape and intervals between the adjacent narrow band-shaped tapes are 0.1-0.5 times the width of the narrow band-shaped tape.

2. The heat-ray reflecting film structure according to claim 1 , wherein an ultraviolet absorbing layer is provided on at least one surface of the multi-layer laminated film.

3. The heat-ray reflecting film structure according to claim 1 , wherein the ultraviolet absorbing layer contains a binder resin and the binder resin is a fluorine resin.

4. The heat-ray reflecting film structure according to claim 1 , wherein an aperture ratio of the heat-ray reflecting film structure is from 10% to 30%, and the transmittance of light with wavelength of 350 nm is from 7% to 21%.

5. The heat-ray reflecting film structure according to claim 1 , wherein the resin layer having high refractive index of the multi-layer laminated film is a resin layer made of resin having a condensed aromatic ring.

6. The heat-ray reflecting film structure according to claim 1 , wherein a difference of average refractive indices between the two kinds of resin layers of the multi-layer laminated film in an in-plane direction is at least 0.03.

7. The heat-ray reflecting film structure according to claim 1 , wherein the multi-layer laminated film has at least 101 layers of resin layers with an optical thickness of 150-400 nm.

Assignees

• Toyo Boseki

Inventors

• Okumura Hisao
• Kobayashi Yutaka

Classifications

• Y02P60/14

  Measures for saving energy, e.g. in green houses · CPC title

• Y02A40/25

  Greenhouse technology, e.g. cooling systems therefor · CPC title

• D10B2505/18

  Outdoor fabrics, e.g. tents, tarpaulins (D10B2507/00 takes precedence) · CPC title

• D04B1/22

  specially adapted for knitting goods of particular configuration · CPC title

• D04B1/16

  synthetic threads · CPC title