JPH06320657A - Light reflecting sheet - Google Patents

Abstract

PURPOSE:To provide a light reflecting sheet to which function for protecting fruit from animals, insects, pest bacteria or weeds is imparted by bonding a porous microcapsule having a specific chemical agent sealed therein to the surface of the fiber base fabric laminated to a light reflecting sheet. CONSTITUTION:A light reflecting sheet 4 is formed by laminating a metal foil 1 to the surface of a polyurethane foam sheet 2 and laminating a heat-shrinkable base fabric 3 to the rear surface of the polyurethane foam sheet 2 and the base fabric 3 is thermally shrunk to form unevenness 5 having a wrinkle like irregular coss-sectional curve shape to the surface of the metal foil 1 through the polyurethane foam sheet 2. Herein, a chemical agent layer 6 composed of a porous microcapsule having at least one chemical agent selected from an animal and insect inhibitor, a disease and insect damage preventing agent, a herbicide and an antibacterial agent sealed therein is applied to the surface of the base fabric 3. By this constitution, the light reflecting sheet capable of protecting fruit from animals, insects, pest bacteria and weeds is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light reflecting sheet containing a predetermined chemical suitable for agricultural use such as orchards and vinyl houses.

[0002]

2. Description of the Related Art In order to improve the coloring of cultivated fruits and enhance the quality of fruits, for example, Japanese Utility Model Publication No. 55-81031,
JP-B 57-23150, JP-B 61-14614
Sheets having excellent light reflectivity have come to be used as seen in Japanese Laid-Open Publication No. These conventional reflective sheets are formed by laminating a metal foil (aluminum foil) on a base cloth woven by tape threads such as slit yarns in order to obtain diffuse reflection of light.

Further, a reflective heat insulating sheet formed by laminating a soft synthetic resin film having a metal vapor-deposited film layer on one surface on a foam has been proposed (Japanese Utility Model Laid-Open No. 57-174036), a metal foil or a metal. Various sheets utilizing the light reflectivity of the vapor deposition film are already known.

It is also known to use a cushion body such as an air mat as a base material as proposed in Japanese Utility Model Laid-Open No. 57-103837.

[0005]

However, the conventional light-reflecting sheet has only the function of reflecting the sunlight to irradiate the fruit with light, such as from birds and birds, pests, weeds and the like. It has not been considered to add a function to protect the.

[0006] In order to solve the above-mentioned conventional problems, the present invention provides a suitable sunlight-reflecting function and the presence of a predetermined sustained-release drug, thereby producing fruit from birds and birds, pests and fungi, weeds and the like. A first object is to provide a light-reflecting sheet having a function of protecting the above.

A second object of the present invention is to provide a light-reflecting sheet which is flexible and lightweight, has an appropriate cushioning property, and is excellent in diffuse reflection of light.

[0008]

In order to achieve the above-mentioned object, a light-reflecting sheet of the present invention comprises a resin foam sheet having a metal foil laminated on one surface thereof and a fiber base cloth on the other surface thereof. Is a light-reflecting sheet that is laminated, wherein the surface of the fiber base fabric is a microporous layer containing at least one agent selected from an avian and insect repellent agent, a pest and disease preventive agent, a herbicide, and a bactericidal agent. It is characterized in that a capsule is attached.

In the above structure, it is preferable that the metal foil has a curved concavo-convex shape when viewed from the cross section because the diffuse reflectance is improved. Further, in the above configuration, it is preferable that the curved uneven shape of the metal foil is due to the contraction of the backing cloth on the back surface, in order to achieve the curved uneven shape.

Further, in the above constitution, the porous microcapsules are aggregates of inorganic porous particles,
It is preferable in order that the sustained-release drug functions effectively. Further, in the above structure, the resin foam sheet and the metal foil, and / or the resin foam sheet and the fibrous base cloth are bonded together.
It is preferable that the resin foam sheet is welded for the purpose of adhesive integration.

[0011]

When the light-reflective sheet of the present invention is used, for example, by laying it under a tree in an orchard for agriculture or by hanging it on a tree, the metal foil on the surface diffusely reflects sunlight in random directions. To improve the coloring of the shaded fruits, promote the growth of the fruits, and make certain controlled-release agents exist.
It is possible to realize a reflective sheet with a function of protecting fruits and the like from wild birds, pests, weeds, etc. And when laid and used under trees, the resin foam sheet of the intermediate layer prevents the temperature of the soil from rising and drying, and reduces the impact of falling fruits by strong winds, etc. to reduce the degree of damage, It is possible to prevent the quality of falling fruits from deteriorating. Further, when the metal foil has a curved concavo-convex shape when viewed from the cross section, diffuse reflectance can be further improved.

[0012]

EXAMPLES The present invention will be described more specifically below with reference to examples. As the resin foam applied to the present invention, various resin foam sheets such as polyurethane foam, polyethylene foam, polypropylene foam, polystyrene foam, silicone rubber foam, and biodegradable cellulose-based foam can be used. The case of use will be described. The polyurethane foam sheet has a thickness of 1 to 10 mm, preferably 2
~ 5 mm. If the thickness of the polyurethane foam sheet is less than 1 mm, sufficient cushioning properties cannot be obtained, and if the thickness exceeds 10 mm, not only the cost becomes high, but also random irregularities rich in diffuse reflection can be formed on the metal foil. It will be difficult. In the case of a polyurethane foam, the expansion ratio is preferably about 7 times or more because a wrinkle is imparted to the reflective layer in accordance with the shrinkage of the base cloth described later, and a continuous foam is more preferable than an independent foam. preferable.

The metal foil is preferably an aluminum foil having a total reflectance of 80% or more by a tungsten lamp and a thickness of 10 to 20 μm. As the heat-shrinkable base cloth to be attached to the back surface of the polyurethane foam sheet, a woven or knitted fabric or a synthetic resin sheet can be applied, which shrinks in the longitudinal and transverse directions by about 5 to 30% at a temperature below the melting point of the polyurethane foam sheet. A coarse woven fabric woven from spun yarn of acrylic fiber or polypropylene fiber, which shrinks at a relatively low temperature, is light, flexible, and inexpensive, and thus is preferably applicable. In addition, the polyurethane foam sheet exerts the same adhesive ability as an adhesive when it is heated to melt its surface, and therefore the above-mentioned base cloth or metal foil can be adhered at a high speed without using an adhesive. / Polyurethane foam sheet / Base cloth 3
A composite sheet having a layered structure can be efficiently manufactured.
The base cloth on the back surface is heat-shrinked to form irregular wrinkles on the metal foil on the front surface through the polyurethane foam sheet.

A gas flame from a gas burner is applied to one surface of a polyurethane foam sheet to melt its surface layer, and a heat-shrinkable base cloth or metal foil is supplied to the melted surface immediately after melting to press both. Bonding, further applying a gas flame with a gas burner to the other surface of the polyurethane foam sheet to melt the surface layer and supply a metal foil, or a base cloth, to the melting surface immediately after melting to bond under pressure, Then, the composite sheet having the three-layer structure is heat-treated in an unrestrained state to shrink the heat-shrinkable base fabric, and the shrinkage of the base fabric causes the metal foil on the surface to be free of wrinkles through the polyurethane foam sheet. To develop a regular uneven pattern.

Next, a method for adhering porous microcapsules enclosing at least one drug selected from repellents for birds and birds, preventive agents for pests, herbicides, and bactericides on the surface of the fiber base cloth will be described. . First, for the porous microcapsules, for example, silica, calcium silicate, alumina, etc. are formed into an aggregate having an average outer diameter of about 5 μm by an interfacial reaction method, and the drug is adsorbed and encapsulated in the aggregate as a core substance. create. Next, acrylic resin (resin coating material) 10
The inorganic porous microcapsule 1.
5 to 10 parts by weight are mixed to form this emulsion,
This emulsion is coated on the back surface of the diffuse reflection sheet and attached.

The agents that can be used in the present invention are, for example, as follows. (1) Extracted components from Ginkgo biloba leaves: 6-alkenylsalicylic acids, sesquiterpenes such as ginkgolide bilobalide, (medicinal effect) repelling aphid, armyworm (2) wormwood leaf extracted components: wormwood oil, (medicinal effect) crow,
Repellents of Bulbul, Pheasant Pigeon, and Starling (3) Extracted components from dry powder of bark, root bark, and branches and leaves of Crimaceae: Repellents of cinnamamic aldehyde and orthocinnamic aldehyde, (medicinal effect) mandarin orange, and persimmon pest thrips ( 4) Extracted components from roses: rose type floral fragrance, geraniol, benzyl aldehyde, tetrahydrolinalylol, cyclamen aldehyde, (medicinal) pigeon,
Repellents for sparrows, crows, starlings and bulbulites (5) Extracted components from white scallions: Pyrethrin components Extracted components from Delis: Rotenone components Extracted components from tobacco: Nicotine components Extracted components from sedans: Azadei techten Extracted components from acebi: acepotoxin Ingredients (Medicinal) Repels mice, rabbits, crows, sparrows, swelling, squirrels, planthoppers, leafhoppers and aphids (6) Extracted components from cedar leaves, shades and baluns: 55% pure
Extract, (vitamins B1, B2, B as antioxidants
(6) and a small amount of citric acid) (Medicinal effect) Antibacterial (7) Creosote, pyridine: (Medicinal effect) Crows, bulbul, Pheasant pigeon, Starling (8) Hot spices: pepper, capsicum, mustard, horseradish, garlic, Onion, turmeric, Nikkei,
Allspice, extract of powdered owl or solvent such as alcohol Aromatic spices: extract of solvent such as clove, thyme, peppermint, perilla, sage, powder of salamander or alcohol, (medicinal effect) of dog, cat, pigeon Repellent (9) O, S-dimethyl-N-acetylphosphoramide thioate: (medicinal effect) Extermination and repellent of aphids, thrips, whitefly, caterpillars, diamondback moth, beetle, white grasshopper (10) Copper ion, silver Organic or inorganic compounds containing metal ions such as ions: (Medicinal effect) sterilization, bactericidal (11) Chlorate herbicides such as sodium chlorate, halogenated fatty acid herbicides, carbamate herbicides, or these Mixed herbicide of the following will describe specific examples of the present invention.

(Example 1) A. Manufacturing Example of Light-Reflecting Sheet Hereinafter, description will be given with reference to the drawings showing an embodiment of the present invention. FIG. 1 shows a sectional view of the light-reflecting sheet of the present invention,
(1) is a metal foil, (2) is a polyurethane foam sheet, and (3) is a heat-shrinkable base cloth. An aluminum foil having a thickness of 13 μm was used for the metal foil (1), and the polyurethane foam sheet (2) had a thickness of 2 mm and a specific gravity of 0. O20
Using the heat-fusible flexible polyurethane foam sheet, a highly shrinkable coarse plain weave was used as the heat shrinkable base fabric. This coarse plain weave is a spun yarn of acrylic fiber (cotton count 1
4S) is disposed on the warp and the weft, and the warp density and the weft density are each 17 / inch. The light-reflecting sheet (4) comprises a polyurethane foam sheet (2) on which the metal foil (1) is attached, and a polyurethane foam sheet (2) on which the heat-shrinkable base cloth (3) is attached. The base fabric (3) is heat-shrinked to form a wrinkle-shaped irregular cross-section curved surface-shaped unevenness (5) on the surface of the metal foil (1) through the polyurethane foam sheet (2). There is. The surface of the base fabric (3) is coated with the drug layer (6) which is microencapsulated.

Next, a method of manufacturing the light-reflecting sheet (4) will be described with reference to FIGS. The polyurethane foam sheet (2) wound up in a roll is pulled out, and the polyurethane foam sheet (2) is rotated at a peripheral speed of 40 m / min while being applied with a tension so that the polyurethane foam sheet (2) is not relaxed by the sebel tension device (10). Roll (11)
Guide the gas burner (1) to one side of the polyurethane foam sheet (2) in this main roll (11).
A flame was blown according to 2), and the surface of the polyurethane foam sheet (2) was melted to a thickness of 0.4 to 0.6 mm to develop an adhesive ability. On the other hand, the heat-shrinkable base fabric (3) is pulled out through the guide roll (13), and is opposed to the peripheral surface of the main control (11) and is located under the gas burner (12). ) Is supplied to the surface side of the polyurethane foam sheet (2) in a molten state, and the sheet (2) and the base cloth (3) are bonded by the pressure action of the pressure roll (14), and then the clean roll ( 15) cooled by this composite sheet (2
0) was once wound into a roll. At this point, the base fabric (3) has hardly undergone heat shrinkage.

Subsequently, as shown in FIG. 3, this composite sheet (20) is equipped with a main roll (11), a gas burner (12), a pressure roll (14) and a clean roll (15) in the same manner as above. Then, the surface of the polyurethane foam sheet (2) is supplied while adjusting the tension so that it does not relax, and a flame is blown by the gas burner (12) on the surface of the polyurethane foam sheet (2) in the same manner as described above. The surface of the foam sheet (2) is lightly melted, the metal foil (1) is introduced to the melted surface and adhered to the polyurethane foam sheet (2), and the metal foil (1) is applied to the surface of the polyurethane foam sheet (2). A three-layer composite sheet (30) having a back surface to which a base fabric (3) was adhered was formed, cooled, and then wound into a roll.

Next, the composite sheet (30) having this three-layer structure
As shown in FIG. 4, it was introduced into a heat treatment apparatus equipped with a heating zone (21) and a cooling zone (22) in a state where the shrinkage was not constrained. That is, the composite sheet (30) is fed to the feed roll (2
In 3), the material was forcibly relaxed and fed into the heat treatment apparatus, and the base fabric (3) was contracted in the longitudinal and transverse directions in the heating zone (21), then cooled and wound up.

The composite sheet (30) thus heat-treated is
The base cloth (3) contracts about 8% in both length and width, and this base cloth (3)
Shrinkage affects the polyurethane foam sheet (2) and the metal foil (1), and even though the back side base fabric (3) side is a flat surface, the front side metal foil (1) has high and low levels as shown in FIG. A light-reflecting sheet (4) having wrinkle-like irregular asperities (5) with a difference of about 1 to 2 mm was obtained. Moreover, the unevenness (5) is firmly adhered to the polyurethane foam sheet (2) even in the recessed portion, and the durability of the unevenness (5) is excellent, and all the unevenness (5) has a cushioning property. It was Further, since the unevenness (5) does not allow sharp scratches like embossing, almost the entire surface contributes to diffused reflection of light.

By the way, the durability of the unevenness (5) of the light-reflecting sheet (4) obtained by the method of this example was tested by the washing method, and the results were as follows. (1) Washing test based on JIS-L-027.103 5 times Grade 5 grade (2) Commercial washing (chlorine dry cleaning) test 1 time Grade 4 grade (3) Commercial washing (petroleum dry cleaning) test Number of times 1 time Grade 4 (All of the above are grades for evaluating the original appearance ratio in 5 grades.) In the above examples, the composite sheet (30) having a three-layer structure was subjected to polyurethane foam in the first step. The procedure for manufacturing by laminating the sheet (2) and the base fabric (3) and then laminating the metal foil (1) in the second step is described. In the first step, the polyurethane foam sheet (2) and the metal It goes without saying that the present invention is satisfied even if the foil (1) is attached and the base fabric (3) is attached in the second step, and the two-layer structure sheet (2
The metal foil (1) or the base cloth (3) may be stuck during the traveling without winding (0). B. Example of preparation of microencapsulation of repellent From cinnamamic aldehyde and orthocinnamic aldehyde extracted from bark and leaves of Crimaceae, and from 6-alkenylsalicylic acids, saxterpenes and cedar leaves extracted from ginkgo leaves, shades and baluns A repellent capsule was obtained by encapsulating the mixture of the extracted extracts into microcapsules having an average outer diameter of 5 μm by the interfacial reaction method of silica. To this repellent capsule, 20% by weight of water and 0.1% by weight of a dispersant were added and kneaded with a roller. Next, a 10-fold amount (weight ratio) of the acrylic resin aqueous dispersion was added and the mixture was kneaded again. C. Example of coating with microencapsulated drug The resin on which the repellent agent capsule described in B is kneaded is adhered to the back surface of the light reflection sheet described in A by a roller.
It was dried with hot air at ℃. The amount of adhesion after drying was 10 g / m ² in terms of the amount of repellent capsules. D. Confirmation of the medicinal effect of repelling birds and animals (a) Cut the above-mentioned sheet into a piece with a width of 15 cm and a length of 30 cm and fold it in half with the aluminum foil side facing outward. The leaves were stapled (Fig. 5). Ten trees were applied evenly to the whole tree. One month later, the sweet summer mandarin oranges in this field did no harm, but in the next sweet summer mandarin orange field without the light-reflecting sheet, about 30% of damage was caused from the particularly ripe ones due to the flock of bulbuls, starlings and crows. Received The fruit growth was also good. (B) Five sheets per eggplant were hung on branches using a thread (Fig. 6). The pests Thrips palmi Thrips, slugs and aphids were completely untouched. The growth of eggplant was also good.

As described above, in the light-reflecting sheet (4) of this embodiment, the metal foil (1) is attached to the surface of the polyurethane foam sheet (2) and the back surface of the polyurethane foam sheet (2) is heat-shrinkable. Since the base cloth (3) is laminated, and the base cloth (3) is heat-shrinked to form irregular wrinkles (5) on the surface of the metal foil (1). For example, when this light-reflecting sheet is laid under a tree in an orchard for agricultural use with the metal foil (1) side as the surface, the sun rays are diffusely reflected toward the fruit to improve the coloring of the cultivated fruit and improve the quality of the fruit. It not only helps to increase the water content but also helps prevent the evaporation of water and weeds in the soil, but it also has cushioning properties, so even if the fruit falls due to a sudden heavy rain such as a typhoon, the falling fruit will be greatly damaged. To prevent Achieve the effect.

Polyurethane foam sheet (2)
Since the base material part including the base cloth (3) is flexible and lightweight,
It is easy to handle, and can be conveniently used as a lining for agricultural houses and also for packaging fruits that have heat retention.

Further, in the manufacturing method of the present embodiment, the composite sheet (30) having a three-layer structure comprising the metal foil (1), the polyurethane foam sheet (2) and the base cloth (3) is
Since the polyurethane foam sheet (2) is attached without using an adhesive agent by using the adhesive ability of the polyurethane foam sheet (2), the light reflecting sheet having high productivity and excellent light diffuse reflection and cushioning properties can be obtained at low cost. Can be provided.

Further, when the polyurethane foam sheet (2) for the intermediate layer is made of an open-celled one, and a large number of small holes are bored to provide it for a farm, it is possible to allow the rain to penetrate into the soil and to bring it into the soil. A part of it is retained in the polyurethane foam sheet, which helps prevent soil from drying. Further, if the polyurethane foam sheet (2) having a closed-cell structure is used, the heat retaining property is improved, and a rapid change in soil temperature or temperature in the agricultural greenhouse is prevented to exert the effect of promoting the growth of agricultural products.

[0027]

As described above, according to the light-reflecting sheet of the present invention, when it is laid under a tree in an orchard for agriculture or hung on a tree, the metal foil on the surface of the sheet is solar. Randomly reflects light rays in random directions to improve the coloring of fruits in the shade, promotes fruit growth, and allows the presence of a prescribed sustained-release drug.
The function of protecting fruits from weeds can be added. The resin foam sheet of the intermediate layer prevents the temperature of the soil from rising and drying, and also reduces the impact of the falling fruit by strong wind or the like to reduce the degree of damage and prevent deterioration of the quality of the falling fruit. Further, when the metal foil has a curved concavo-convex shape when viewed from the cross section, the diffuse reflection of light can be further improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view in the thickness direction of a light reflecting sheet according to an embodiment of the present invention.

FIG. 2 is an explanatory view illustrating the first step of the manufacturing method according to the embodiment of the present invention.

FIG. 3 is an explanatory view illustrating the second stage of the manufacturing method according to the embodiment of the present invention.

FIG. 4 is an explanatory view schematically showing a heat treatment process of one example of the present invention.

FIG. 5 is an explanatory view in which the light-reflecting sheet coated with the drug of one example of the present invention is attached to a leaf of sweet summer oranges.

FIG. 6 is an explanatory diagram in which a light-reflecting sheet coated with a drug according to an embodiment of the present invention is attached to an eggplant tree.

[Explanation of symbols]

 1 Metal Foil 2 Polyurethane Foam Sheet 3 Base Fabric 4 Light Reflective Sheet 5 Concavo-convex 6 Microencapsulated Drug Layer

Claims (5)

[Claims] 1. A light-reflecting sheet in which a metal foil is attached to one surface of a resin foam sheet, and a fiber base cloth is attached to the other surface of the resin foam sheet, wherein the surface of the fiber base cloth is attached. A light-reflecting sheet, to which porous microcapsules encapsulating at least one drug selected from avian and bird repellents, pest and disease preventives, herbicides, and bactericides are attached. 2. The light-reflecting sheet according to claim 1, wherein the metal foil has a curved concavo-convex shape when viewed from a cross section. 3. The light-reflecting sheet according to claim 2, wherein the curved uneven shape of the metal foil is due to contraction of the backing cloth. 4. The light-reflecting sheet according to claim 1, wherein the porous microcapsules are aggregates of inorganic porous particles. 5. The light reflective sheet according to claim 1, wherein the bonding of the resin foam sheet and the metal foil, and / or the bonding of the resin foam sheet and the fiber base cloth is welding of the resin foam sheet.