JP3352508B2 - Light transmission material for plant cultivation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light transmitting material for plant cultivation, which is used as a peripheral material of an outdoor structure for growing plants.

[0002]

2. Description of the Related Art As a light transmitting material for plant cultivation, for example, a transparent plate glass is generally used as a glass material for a greenhouse for plant cultivation. Further, as a glass material for the atrium or the top light, a netted glass or a laminated glass is usually used from the viewpoint of preventing scattering at the time of breakage. However, since all of these glass materials transmit infrared rays well, the temperature of the internal space covered by them increases. In addition, it increases the leaf temperature of the plant or the soil temperature, thereby inhibiting the growth of the plant. Further, the laminated glass completely cuts off the ultraviolet rays, thereby inviting plants to grow, inhibiting the action of coloring pigments, and inhibiting pigment synthesis of fruits and petals.

[0003] In order to solve such a problem, there has been proposed a laminated glass that largely cuts infrared rays. However, since this one hardly transmits ultraviolet rays,
It is an unsuitable material for plant growth. Further, as a light transmitting material that can be used for plant growth, a water filter that cuts infrared rays and ultraviolet rays greatly and transmits visible light well has been proposed (JP-A-63-116626, 192).
No. 330, JP-A-1-282505). However, this filter has a problem that the temperature of the filter itself rises by absorbing infrared rays.
Also, since it contains water, it becomes heavy and difficult to handle.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems in the prior art, and provides a light transmitting material for plant cultivation which is suitable for plant growth, does not excessively raise the temperature, and is easy to handle. That is the task.

[0005]

In order to solve the above problems, a light transmitting material for plant cultivation according to the present invention comprises a heat ray reflective film and a protective material which sandwiches the heat ray reflective film and transmits at least light having a wavelength shorter than that of infrared rays. Wherein the heat ray reflective film and the protective member are integrated with an adhesive material that transmits at least visible light and selectively transmits ultraviolet light.

[0006]

According to the present invention, since the light transmitting material for plant cultivation is provided with the heat ray reflecting film, the light in the infrared region is largely blocked. As the heat ray reflective film, a commercially available film can be used. Since such a heat ray reflective film reflects infrared rays, the temperature of the light transmitting material itself does not rise so much.

[0007] The protective member structure sandwiches the heat ray reflective film, thereby preventing the heat ray reflective film from being degraded, scratched, and the like, and imparts certain strength and weather resistance thereto. Further, since the protective member transmits at least light having a shorter wavelength than infrared light, transmission of visible light and ultraviolet light is not hindered. As a result, the heat ray reflective film can be used for outdoor plant growth. Normally, transparent glass can be used as such a protective member. However, a resin material having a certain strength may be used. In this case, if the resin material has a certain strength and thickness, the resin material or the like may be a sheet-like soft material.

[0008] Since such a heat ray reflective film and the protective member are integrated with an adhesive material, the light transmitting material for plant cultivation has the necessary strength as a unit, and has a penetration resistance and a shear resistance. Etc. are improved. When the protective member is glass, it does not scatter at the time of destruction, and has the advantage of a laminated glass.

This adhesive material transmits at least visible light and selectively transmits ultraviolet light. Here, “selectively transmitting ultraviolet light” means transmitting a considerable amount of light having a wavelength close to the visible range among ultraviolet wavelengths. Such characteristics of the adhesive material can be obtained by adjusting the amount of, for example, an additive that absorbs ultraviolet light to a main component having an adhesive effect such as a resin. Alternatively, it can be obtained by adding an additive that blocks or absorbs a certain amount of ultraviolet light. When the ultraviolet rays are selectively transmitted in this way, the durability of the heat ray reflective film can be maintained.

[0010] As described above, the light transmitting material for plant cultivation of the present invention has a configuration that largely blocks infrared rays, transmits visible light well, and transmits a considerable amount of ultraviolet light. It is a material to do.

[0011]

FIG. 1 shows the structure of a light transmitting material for plant cultivation according to an embodiment. The transmitting material has a heat ray reflective film 1 and plate glasses 2 and 2 serving as a protective member that sandwiches the heat reflecting film 1 and transmits at least light having a wavelength shorter than that of infrared rays. It was formed. The bonding is performed, for example, by evacuating air in a reduced-pressure pack and heating the sheet with the heat ray reflective film 1 sandwiched between the glass sheets 2 and 2 with the adhesive materials 3 and 3 therebetween, and heating the film under atmospheric pressure.

The heat ray reflective film is a material having a structure in which a metal such as aluminum, gold, silver, copper, or an alloy thereof is deposited on a polyester film, for example. Since this film reflects infrared rays, when the light transmitting material for plant cultivation is used in a house for growing plants, the internal temperature is not excessively increased. Further, the temperature rise of the transmission material itself is also suppressed.

The glass sheet has a thickness of, for example, about 3 mm to 5 mm. For example, a sheet glass having a thickness of 3 mm transmits normal sunlight well. Therefore, visible light and ultraviolet light necessary for plant growth are transmitted. However, the protective member is not limited to such a glass, for example, acrylic,
A resin-based material such as polycarbonate may be used. The sheet material is not limited to a plate material, but may be a sheet material such as polyvinyl chloride or polyethylene as long as it has a certain strength and does not hinder the transmission of visible light and ultraviolet light.

The adhesive material is a resin material having an adhesive action, for example, a polyvinyl butyral resin or an ethylene-vinyl acetate resin, and an additive having a function of blocking or absorbing ultraviolet light, for example, a benzophenone-based, benzotriazole-based, salicylic acid-based resin. , Cyanoacrylates and mixtures thereof. In this case, the additive amount of the additive is determined so as to transmit an appropriate amount of ultraviolet light,
For example, it may be an amount that transmits about 50% of an ultraviolet ray having a wavelength of about 400 nm to 350 nm. By doing so, ultraviolet rays necessary for growing plants in a house or the like can be obtained, and the effect of the ultraviolet rays on the durability of the heat ray reflective film is small.

FIG. 2 shows the spectral transmittance of the light transmitting material for plant cultivation having the above configuration. FIG. 3 is an enlarged view of a portion of the wavelength of 200 nm to 500 nm in the above figure. As shown in the drawing, the light transmitting material of the present embodiment shown by a solid line largely blocks light in the infrared region having a wavelength of 780 nm or more, but transmits visible light well and further has a wavelength of 340 nm.
A considerable amount of light in the ultraviolet region from 400 nm to 400 nm is transmitted. The dotted line in the figure is a 3 mm thick plate glass,
The dashed line indicates a normal laminated glass. The glass sheet having a thickness of about 3 mm used as a protective member of the light transmitting material is:
Transmits ultraviolet light sufficiently. Ordinary laminated glass completely blocks out ultraviolet light and cannot be used for plant cultivation. The spectral transmittance of the light transmitting material for plant cultivation shown by the solid line in the figure is an example, and it goes without saying that the light transmitting material of the present invention is not limited to such characteristics.

[0016]

As described above, according to the present invention, the infrared ray is largely blocked by the heat ray reflective film, the film is supported by the protective member, and the film is protected by the adhesive material that selectively transmits ultraviolet light. By bonding the members to each other and giving them integral strength, the light transmitting material for plant cultivation can provide weather resistance, strength, safety (splash prevention), infrared shielding properties, transmission of visible light, and partial transmission of ultraviolet light. It has transmission characteristics and the like, and its temperature rise itself is small, and its handleability is improved. As a result, the light transmitting material for plant cultivation is suitable for use as a peripheral material of a plant cultivating structure.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a light transmitting material for plant cultivation of an example.

FIG. 2 is a curve diagram showing a spectral transmittance of the light transmitting material for plant cultivation.

FIG. 3 is a curve diagram showing an enlarged part of the wavelength range in the upper diagram.

[Explanation of symbols]

 1 heat ray reflection film 2 sheet glass (protective member) 3 adhesive material

Continuation of the front page (56) References JP-A-53-98244 (JP, A) JP-A-59-97039 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01G 13 / 02

Claims (1)

(57) [Claims] 1. A heat-ray reflecting film and a protective member sandwiching the heat-ray reflecting film and transmitting at least light having a wavelength shorter than that of infrared light, and an adhesive material that transmits at least visible light and selectively transmits ultraviolet light. A light transmitting material for plant cultivation, wherein the heat ray reflective film and the protective member are integrated.