JP2001086881A - Agricultural light reflecting sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agricultural light reflecting sheet difficult to be broken, emitting reflected light gentle to the eye and used for mulching and a farm house. SOLUTION: This agricultural light reflecting sheet 1 subjected to crepe processing has a light-reflecting function. Shrinkage percentage due to the crepe processing is preferably 5 to 50% and partial thermal shrinkage difference is preferably caused by the crepe processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural light reflecting sheet used for mulching and agricultural houses.

[0002]

2. Description of the Related Art Mulching for covering required parts of soil, such as roots and ridges of crops, is to control the soil temperature to promote the growth of crops, and to prevent evaporation of water from the soil to reduce the number of times of watering. One of the agricultural methods that aims to prevent the occurrence of weeds, to prevent the soil from jumping during rainfall and to prevent the contamination of crops with bacteria, bacteria, viruses, etc.
One. For such mulching, a mulching sheet made of a synthetic resin is used. In particular, for the purpose of promoting the growth of agricultural crops, lowering the ground temperature, repelling pests, etc., light reflection by a metal deposition layer or a metal foil layer A light reflecting sheet having a function is used.

In order to promote the cultivation of fruits, vegetables, flowers and the like, agricultural houses are used in which a frame for a frame is covered with a glass plate or vinyl to increase the temperature inside.
Also in such agricultural houses, the light reflecting sheet is used at required places for the purpose of reflecting the light to the north side to uniformly grow crops, avoiding the invasion of pests and small animals, and the like. .

[0004]

However, the conventional agricultural light reflecting sheet has the following disadvantages. That is, (1) The conventional light reflection sheet has a light reflection layer such as a metal vapor deposition layer of aluminum or the like or a metal foil layer, and such a light reflection layer has a strong light reflection function. for that reason,
The operator is obstructed by the work because the reflected light from the light reflection sheet is too dazzling. In the southern hemisphere, where ultraviolet rays are strong due to the ozone hole, there is a possibility that the reflected light from the light reflection sheet may adversely affect the human body.

(2) Since the conventional light reflecting sheet is a smooth sheet, if it is subjected to an external impact while being stretched,
It tears relatively easily, and the tear strength is not very strong.

[0006] The present invention has been made in view of these disadvantages, and it is an object of the present invention to provide an agricultural light reflecting sheet that is resistant to tearing and is easy on reflected light.

[0007]

The invention made to solve the above-mentioned problem is an agricultural light reflecting sheet having a light reflecting function, which is creped. Here, “crepe processing” means a means for forming shrinkage and wrinkles on a sheet.

According to the light reflecting sheet, since the sheet has shrinkage and wrinkles formed by creping,
The reflected light is diffused by the shrinking and wrinkling, and has a luminance distribution in which the peaks are alleviated. Therefore, glare like a conventional light reflection sheet is reduced, and the burden on the eyes of the worker is reduced. Therefore, it is possible to prevent a reduction in work efficiency due to strong reflected light as in the conventional light reflection sheet.

Further, since the reflected light can be diffused as described above, the irradiation of the crop with the light can be made more uniform, and as a result,
The effect of uniformizing the growth of agricultural products can be exhibited. The light reflecting sheet diffuses the reflected light and does not suppress the reflection, so that the amount of reflected light is not reduced as a whole, and thus does not adversely affect the promotion of the growing of the crop.

Further, since the light reflecting sheet is shrunk by creping, it can be widened by an amount corresponding to the shrinkage. As a result, compared with a conventional smooth light reflecting sheet, the light reflecting sheet is more resistant to external impact. As a result, the buffering action is exerted, so that the tear strength can be improved.

The shrinkage ratio due to the creping is preferably 5% or more and 50% or less. This means that if the shrinkage due to creping is smaller than the above range, the effect of diffusing the reflected light is small, and the above-mentioned various effects cannot be exhibited effectively, and conversely, if the shrinkage due to creping exceeds the above range, This is because the effect of diffusing the reflected light is great, but on the other hand, handling becomes inconvenient and the weight per unit area increases.

In the creping process, pressing by a pair of dies having concavities and convexities on the corresponding opposing surfaces is possible. Creping by pressing a pair of molds is suitable for forming a sheet made of a synthetic resin or the like. If a pair of rolls used in the laminating step in the production of the light reflecting sheet are used as the mold and the roll surfaces are formed in an uneven shape, creping can be performed simultaneously with the production of the light reflecting sheet.

As the creping process, a method of causing a partial difference in heat shrinkage is also possible. In other words, due to the partial heat shrinkage difference, the light reflecting sheet is partially shrunk,
It forms shrinkage and wrinkles. This crepe processing
It is suitable as a means for forming shrinkage and wrinkles in a light reflecting sheet having a multilayer structure in which synthetic resins are laminated. As a means for generating a partial heat shrinkage difference, a synthetic resin yarn having a large heat shrinkage is partially laminated, and a method of applying heat to shrink the yarn more than other parts, There is a heating method.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings as appropriate. FIG. 1 is a schematic sectional view showing an agricultural light reflecting sheet according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view showing an agricultural light reflecting sheet having a different form from the light reflecting sheet of FIG. 1.

The light reflecting sheet 1 shown in FIG.
The light reflection layer 3, the anchor coat layer 4, and the laminate layer 5 are sequentially laminated from the surface side. The light reflection function of the light reflection layer 3 aims to repel pests and promote the growth of agricultural crops. The light reflecting sheet 1 is formed with shrinkage and wrinkles by creping, and specifically, the convex portions 6 and the concave portions 7 are alternately formed. Due to such shrinking and wrinkling, the light reflecting sheet 1 can diffuse the reflected light, which is easy on the eyes of the operator. Further, the light reflecting sheet 1 has a widening function due to the extension of the contraction and wrinkles, and the widening function makes it hard to be broken even when an external impact is applied.

In order to exhibit the above effects effectively, the shrinkage by creping is preferably 5% or more and 50% or less, and the average width of the unevenness in the shrinking wrinkles (the average distance between the adjacent convex portions 6 or the adjacent width). Average distance between matching recesses 7) is 2
It is preferably from 10 mm to 10 mm. This is because, if the average width of the irregularities is smaller than the above range, the diffusion action of the reflected light cannot be increased much, although creping is difficult. Conversely, if the average width exceeds the above range, the reflected light is diffused. This is because the effect of causing the above is small and the above-mentioned effects cannot be exhibited.

The film layer 2 is formed of a synthetic resin having excellent transparency so as not to block the reflection of light by the light reflecting layer 3 described later. Examples of the synthetic resin include polyethylene, polypropylene, polyethylene terephthalate, and polyamide. And acrylic resin, ethylene-vinyl acetate copolymer, polyethylene naphthalate, polyvinyl chloride, and the like. Polyethylene terephthalate is most suitable in consideration of strength, durability, heat resistance, and versatility.

The light reflection layer 4 is a layer for exhibiting a light reflection function, and specifically, a metal vapor deposition layer in which metal is vapor-deposited in a layered (film) form, a metal foil layer in which metal foils are laminated, and the like. There is. Examples of the metal used for the metal deposition layer include metals that can be easily deposited and exhibit a light reflecting function, such as aluminum, silver, gold, and copper. Examples of the metal that can be used for the metal foil layer include metals that can be easily processed into a foil and exhibit a light reflecting function, such as aluminum, copper, steel, and stainless steel. The metal deposited layer is suitable as an agricultural light reflecting sheet because it can be formed thinly and uniformly, and aluminum is preferred as the metal used for the metal deposited layer because of its easy handling.

The anchor coat layer 4 is a layer for improving the adhesiveness between the light reflection layer 3 and the laminate layer 5, and is provided with an adhesion promoter (for example, a urethane or polyester coating agent). It is formed by coating on the surface of.

The laminate layer 5 is formed of a synthetic resin having excellent transparency. As such a synthetic resin, for example,
Polyethylene, polypropylene, polyethylene terephthalate, polyamide, acrylic resin, ethylene-vinyl acetate copolymer, polyethylene naphthalate, polyvinyl chloride, and the like can be mentioned, but polyethylene and polypropylene are most suitable in consideration of versatility and the like.

Next, a method of manufacturing the light reflecting sheet 1 will be described. First, the light reflection layer 3 is laminated on the film layer 2 by vapor deposition of metal or the like. Next, the sheet composed of the film layer 2 and the light reflection layer 3 and the molten synthetic resin constituting the laminate layer 5 are coated with a coating agent on the surface of the light reflection layer 3 to form the anchor coat layer 4. By laminating by extrusion lamination.

Thereafter, the light reflecting sheet 1 is creped. For this crepe processing, a processing method of pressing with a pair of molds having concavities and convexities on the corresponding opposing surfaces is adopted. In the creping, the pair of rolls of the extrusion lamination may be used as a pair of creping dies, and creping may be performed simultaneously with lamination.

The light reflection sheet 11 shown in FIG. 2 has a film layer 2, a light reflection layer 3, an anchor coat layer 4, a laminate layer 5, and a reinforcing material layer 8 laminated in this order from the front side.
Since each layer except the reinforcing material layer 8 is the same as the light reflection sheet 1 of FIG. 1 described above, the same reference numerals are given and the description is omitted. The reinforcing material layer 8 is laminated for the purpose of improving the strength of the light reflection sheet 11, and specifically,
Cloth, split cloth, made of polyethylene, polypropylene, etc.
Nonwoven fabrics and the like can be mentioned.

The method of manufacturing the light reflecting sheet 11 is the same as the method of manufacturing the light reflecting sheet 1 of FIG. 1 except that the reinforcing material layer 8 is further laminated in the extrusion lamination. However, the creping of the light reflecting sheet 11 utilizes a partial difference in heat shrinkage. That is,
In the creping process, the cloth constituting the reinforcing material layer 8 is made to have a large heat shrinkage every predetermined number, and the entire heat shrinkage of the cloth causes shrinkage to be formed on the whole. According to this creping, shrinking and wrinkling can be easily formed without using the above-mentioned mold.

[0025]

As described above, according to the agricultural light reflecting sheet of the present invention, it is possible to make the reflected light gentle to the eyes by creping, thereby preventing the work efficiency of the worker from being lowered. Further, the tearing strength can be improved by the widening function caused by the extension of the shrinkage and wrinkles.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an agricultural light reflecting sheet according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing an agricultural light reflecting sheet having a different form from the agricultural light reflecting sheet of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light reflection sheet 2 Film layer 3 Light reflection layer 4 Anchor coat layer 5 Laminate layer 6 Convex part 7 Concave part 8 Reinforcement material layer 11 Light reflective sheet

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (reference) // B32B 27/00 B32B 27/00 N 4F210 B29K 105: 30 B29K 105: 30 B29L 7:00 B29L 7: 00 F-term (reference) 2B024 AA04 DA01 DB07 2B029 EB02 EB15 EB21 EC03 EC20 2H042 BA04 BA12 BA15 BA16 4F100 AK04 AK07 AK15 AK25 AK25 AK42 AK46 AK68 AR00B AT00A BA02 DD06 DD12 EJ39 GB01 JA03BJF4J03 Y03N03 RC02 RG02 RG04 RG13 RG30

Claims (4)

[Claims] 1. An agricultural light reflecting sheet having a light reflecting function, wherein the agricultural light reflecting sheet is creped. 2. The shrinkage rate due to the creping process is 5%.
The agricultural light reflecting sheet according to claim 1, which is at least 50%. 3. The agricultural light reflecting sheet according to claim 1, wherein the creping is a pressing by a pair of dies having an uneven surface formed on an opposing surface. 4. The agricultural light reflecting sheet according to claim 1, wherein the creping is performed by causing a partial heat shrinkage difference.