JP2000300058A - Dewfall-preventing cover for outdoor use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dewfall-preventing cover for outdoor use, capable of preventing the dewfall by absorbing water emanated from the object to be covered by using a waterproof sheet having a water-absorbing layer capable of reversibly absorbing and releasing moisture, and excellent in wear resistance, and also having waterproof properties, light-shielding properties and air- permeability. SOLUTION: This cover 1 for outdoor use, and for covering the stack object such as farm products is obtained by connecting dewfall-preventing waterproof sheet 2 with a light-shielding air-permeable sheet 3. The dewfall-preventing cover 1 for outdoor use is characterized by constituting the light-shielding air- permeable sheet 3 so as to cover at least a part of the side face part of the object, and forming the dewfall-preventing waterproof sheet 2 by laminating a water-absorbing layer and a waterproof layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outdoor cover having a dew-preventing property, a waterproof property, a light-shielding property and a ventilation property.

[0002]

2. Description of the Related Art Conventionally, agricultural products such as potatoes and onions are collected in a collection container when they are harvested. However, they are not immediately processed but are transported to a processing plant or marketed after several days while being packed in the collection container. Often shipped. During that time, the collection container is left outdoors and stored in a field or the like, and is often covered with a cover made of a waterproof sheet in order to prevent rain and dew and to shield light. However, during this storage, the waterproof and light-shielding properties are sufficient, but the air permeability is not sufficient, so that a large amount of moisture emanates from potatoes, onions, etc., and dew condensation occurs on the back of the cover due to temperature differences between day and night. In addition, there is a problem that generated water droplets again drop on potatoes, onions and the like, which significantly lowers the quality of agricultural products.

[0003]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention comprises a laminate of a water-absorbing layer and a waterproof layer made of fiber that can absorb and release moisture reversibly, and has excellent anti-condensation properties with excellent wear resistance. It is an object of the present invention to provide a dew-condensing outdoor cover having a waterproof, light-shielding, and air-permeable property while absorbing moisture emanating from an object to be coated using a waterproof sheet to prevent dew condensation.

[0004]

According to the present invention, there is provided, as a means for solving such a problem, an outdoor cover for covering an object to be piled such as agricultural products, wherein the outdoor cover is provided with a dew condensation preventing waterproof sheet. The light-shielding gas-permeable sheet is bonded to the light-shielding gas-permeable sheet, and the light-shielding gas-permeable sheet is configured to cover at least a part of the side surface of the object. ) And (B) are joined together, wherein the (A) layer is at least partially thermally welded, has a moisture permeability of 50 g / m ² · h or more, and has a JIS L1076 on the surface of the (A) layer. Is a pilling test evaluation of 3 or more, and is a laminate obtained by laminating the (B) layer of the joined body and a waterproof layer provided with a polyolefin layer on both sides or one side of a woven or knitted fabric made of thermoplastic fiber. Features a dew condensation-resistant outdoor cover To solve the above problems. (A) layer: Woven knitted fabric, nonwoven fabric or felt composed of 50 to 95% by weight of thermoplastic fiber and 5 to 50% by weight of hydrophilic fiber. (B) layer: thermoplastic fiber 5 to 50% by weight and hydrophilic fiber 5
A woven or knitted fabric, a nonwoven fabric or a felt composed of 0 to 95% by weight.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the drawings. FIG. 1 is a perspective view schematically showing a dew condensation preventing outdoor cover 1 according to the present invention. 2
Is a waterproof sheet for preventing dew condensation, 3 is a light-shielding breathable sheet, and 4 is an eyelet provided for binding the cover.

FIG. 3 shows a container 7 for collecting agricultural products, which is an example of an object to be covered. FIG. 3 is an explanatory view showing a state in which five potatoes 8 are housed in a rectangular container 7 for collection. The object to be covered forms a ceiling part 5 and a side part 6, and the collection container 7 is formed into a dew condensation preventing outdoor cover 1.
When it is covered, the ceiling part 5 needs to be covered with the dew condensation preventing waterproof sheet 2, and at least a part of the sheet covering the side face part 6 needs to be the light shielding and breathable sheet 3.

The dew condensation preventing outdoor cover 1 of this embodiment is
When the collection container 7 is covered, the ceiling 5
A dew-preventing waterproof sheet 2 having a square shape substantially corresponding to the projected shape is disposed at the center of the cover, and a light-shielding gas-permeable sheet 3 is joined around the four sides thereof. Is provided with eyelets 4 for connection at predetermined intervals.

FIG. 4 shows a state in which the above-mentioned dew condensation preventing outdoor cover 1 covers an object in which five collection containers 7 are arranged. The ceiling part 5 is covered with a dew condensation preventing waterproof sheet 2, and the side parts 6 around the four sides are covered with a light shielding and breathable sheet 3.
It is configured to cover the object that hangs down. The dew condensation preventing cover 1 is tied to and fixed to the lower part of the collection container 7 through a string 9 at an eyelet 4 provided at the lower end of the periphery of the outer cover 1.

However, since the dew condensation-preventive outdoor cover 1 of the present invention covers objects to be piled up such as agricultural products, the present invention is not limited to the above-mentioned shape, and a cover having a shape corresponding to an arbitrary shape is used. Can be Therefore, the cover may be in the form of a single sheet, or as shown in FIG. 2, may be cut out so as to be easily formed into a rectangular parallelepiped box shape, and further conformed to the rectangular parallelepiped shape by means such as sewing. The present invention is also included in a box-shaped structure.

The dew condensation preventing waterproof sheet 2 may not only cover the ceiling 5 of the object but also cover a part of the side surface 6 around the periphery. The light-shielding and breathable sheet 3 is configured to cover at least a part of the side surface 6 of the object, and preferably occupies 50% or more, more preferably 75% or more of the total area of the side surface 6. It is.
The light-shielding and breathable sheet 3 may cover the entire four side faces 6 as in the present embodiment, but may cover three or two of the four sides, or each side part. A configuration may be adopted in which windows are randomly provided so that the total of the light-shielding and permeable sheets 3 of No. 6 is at least 50% or more. If the proportion of the light-shielding air-permeable sheet 3 is less than 50%, the air permeability becomes insufficient, the load on the dew condensation preventing sheet increases, and the effect of the dew condensation preventing property decreases, which is not preferable.

As a method for joining the dew condensation preventing waterproof sheet 2 and the light-shielding breathable sheet 3, any of sewing, welding, and bonding using an adhesive can be used.

The dew condensation preventing waterproof sheet 2 is made of a water absorbing layer 1.
0 and a waterproof layer 11.

The water-absorbing layer comprises a layer (A) composed of a woven or knitted fabric, a nonwoven fabric or a felt comprising 50 to 95% by weight of a thermoplastic fiber and 5 to 50% by weight of a hydrophilic fiber; (A) a woven or knitted fabric comprising 50 to 95% by weight of hydrophilic fibers, a nonwoven fabric or a layer (B) formed of felt, wherein the layer (A) is partially thermally welded. It has a moisture permeability of 50 g / m ² · h or more and a pilling test evaluation of JIS L1076 on the surface of the layer (A) of 3 or more.

The thermoplastic fibers are fibers formed by melting a thermoplastic resin, and examples of the thermoplastic resins include polyolefins such as polyethylene and polypropylene, polyesters, and nylons. Of these, polyolefins which are easy to form fibers and are inexpensive are preferred, and polyethylene which is particularly excellent in mechanical properties is preferred.

The hydrophilic fibers include natural fibers such as cotton, hemp, silk, wool, rayon, polyacrylonitrile,
Synthetic fibers such as polyvinyl alcohol are exemplified.

The woven or knitted fabric comprising the thermoplastic fiber and the hydrophilic fiber is formed by knitting a multifilament capable of imparting water-absorbing performance by capillary action of water into a fiber gap as a thermoplastic fiber and a rayon yarn as a hydrophilic fiber. Woven knitted fabric is preferred. The single filament fineness of the multifilament is preferably 0.1 to 20 denier (hereinafter abbreviated as d), and is preferably 0.1 to 20 denier.
5-10d is more preferable. If the single fiber fineness is less than 0.1 d, the fiber forming property is difficult, and if it exceeds 20 d, the moisture absorption performance based on the capillary phenomenon is lowered as a thermoplastic fiber, which is not preferable.

The non-woven fabric comprising the thermoplastic fiber and the hydrophilic fiber is a laminate of the short fiber and / or the long fiber of the thermoplastic fiber and the short and / or the long fiber of the hydrophilic fiber, and is formed by hydroentanglement or needle punching. Or a spunbonded nonwoven fabric or a meltblown nonwoven fabric made of thermoplastic fiber and short fibers and / or long fibers of hydrophilic fibers, and entangled by hydroentanglement or needle punching. It is a thing. The single-fiber fineness of the fibers used in the nonwoven fabric is preferably 0.01 to 15d, more preferably 0.1 to 5d. Single yarn fineness is 0.0
If it is less than 1 d, it is difficult to form fibers, and if it exceeds 15 d, the moisture absorption performance based on the capillary phenomenon is reduced as a nonwoven fabric, which is not preferable.

The felt made of the thermoplastic fiber and the hydrophilic fiber includes a woven felt or a compressed felt made of a short fiber of the thermoplastic fiber and the hydrophilic fiber, or a needle felt obtained by needle-punching a web made of the short fiber. No.

The thermoplastic fiber and the hydrophilic fiber are twisted with each other,
Mixing by mixing, weaving, knitting or the like is acceptable.

In the present invention, the layer (A) is composed of 50 to 95% by weight of thermoplastic fibers and 5 to 50% by weight of hydrophilic fibers, and the layer (B) is composed of 5 to 5% of thermoplastic fibers.
It is composed of 0% by weight and 50 to 95% by weight of hydrophilic fiber.

The layers (A) and (B) are joined to form a water-absorbing layer as a joined body. As a joining method, a known joining method such as a hydroentanglement method or a needle punch method can be adopted.

The basis weight of each of the layers (A) and (B) is preferably from 30 to 200 g / m ² , and the basis weight of the joined body is preferably from 60 to 400 g / m ² . If the basis weight of each of the (A) layer and the (B) layer is 30 g / m ² and the basis weight of the joined body is less than 60 g / m ² , the water absorption becomes insufficient,
The basis weight of each of the (A) layer and the (B) layer is 200 g /
If m ² and the basis weight of the joined body exceed 400 g / m ² , the weight becomes excessively large, which is not preferable for practical use.

It is essential that the layer (A) is at least partially thermally welded, has a moisture permeability of 50 g / m ² · h or more, and has a pilling test evaluation of 3 or more according to JISL1076 on the surface of the layer (A). It is. As used herein, "at least partially welded" means that the layer (A) is heated and welded by a high frequency welding method, an ultrasonic welding method, a heating press method, a calendering method, a hot air method, or the like. In addition, the thermoplastic fibers in the layer (A) are at least partially melted and the thermoplastic fibers are at least partially welded to each other. As a result of at least partial welding, it is possible to maintain a state where the moisture permeability is 50 g / m ² · h or more and the pilling test evaluation according to JIS L1076 on the surface of the layer (A) is 3 or more. If the welding is insufficient, the pilling test evaluation of the surface of the layer (A) according to JIS L1076 is less than 3, and the wear resistance is inferior in practical use, which is not preferable.

Particularly preferred embodiments for forming the "at least partially welded" state include:
The combined body of the (A) layer and the (B) layer is heated and pressure-contacted to the (A) layer surface by a calender method, and the heating temperature, the contact pressure, the traveling speed, and the like are adjusted, so that the moisture permeability and the (A) ) The pilling test evaluation according to JIS L1076 on the layer surface may be managed so as to be within the above specified range.

The waterproof layer in the present invention has a structure in which a polyolefin layer is provided on both sides or one side of a woven or knitted fabric made of thermoplastic fibers. As the thermoplastic fiber used for the waterproof layer, nylon, polyester, polyolefin, etc. excellent in fiber formability are used, but polyolefin excellent in moldability and inexpensiveness is preferably used. Is preferred. The fiber form is monofilament, multifilament,
Both flat yarn and split yarn can be used. Among these, a flat yarn which is flexible and has excellent moldability is preferable.

As a method for providing a polyolefin layer on both surfaces or one surface of a woven or knitted fabric woven and knitted using the thermoplastic fibers as warp yarns, a known extrusion lamination method is used. Examples of the polyolefin used in the polyolefin layer include polyolefins commonly used in laminating methods such as low-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-alkyl acrylate copolymer, and polypropylene.

On the surface of the waterproof layer of the present invention, a waterproof polyolefin layer containing a coloring pigment or a polyolefin layer joined to an aluminum layer and having a light-shielding property is preferable. . Among these, a polyolefin layer containing a coloring pigment is preferable.

The color pigment is not particularly limited, but a light-reflective pigment such as white or silver and / or a light-absorbing pigment such as black is used. The content of the coloring pigment is preferably from 0.1 to 5% by weight, more preferably from 0.5 to 2% by weight. When the light-reflective pigment and the light-absorbing pigment are used in combination, the polyolefin layer containing the light-reflective pigment is bonded to the surface layer, and the polyolefin layer containing the light-absorbing pigment is bonded to the back layer to form a multilayer polyolefin layer. It is preferred to use Specific examples of the pigment include titanium oxide as a white pigment, metal aluminum powder as a silver pigment, and carbon black as a black pigment.

The method for providing the aluminum layer is not particularly limited, and a method in which an aluminum vapor-deposited film or aluminum foil and a polyolefin layer are joined by a sandwich lamination method can be used.

The dew condensation preventing waterproof sheet of the present invention is formed by laminating the water absorbing layer (B) and the waterproof layer. As a laminating method, a previously formed water-absorbing layer and a waterproof layer may be laminated using an adhesive or the like, but a known sandwich laminating method is used between the (B) surface of the water-absorbing layer and the back layer of the waterproof layer. Is preferred to provide a polyolefin layer and laminate the layers. A light absorbing pigment may be blended in the sandwich laminate layer.

The thermoplastic fiber used in the present invention includes an antioxidant, a lubricant, an ultraviolet absorber, a light stabilizer, a flame retardant, an antistatic agent, a pigment within a range not departing from the gist of the present invention depending on the purpose of use. Further, additives such as an inorganic filler, an organic filler, a crosslinking agent, a foaming agent, and a nucleating agent may be blended.

[0032]

EXAMPLES Test Methods Test evaluation was performed according to the following methods. 1. 1. Moisture permeability: JISL1099 compliant Abrasion resistance: Evaluation was performed based on a pilling test method according to JIS L1076, with a processing time of 1 hour.

Example 1: High density polyethylene (MFR =
10 g / 10 min, density = 0.958 g / cm ³ ) to form short fibers having a single yarn fineness of 10d. On the other hand, rayon short fibers having a single yarn fineness of 10d were prepared. 45 g / m ^{2 of} high density polyethylene short fiber and 5 g of rayon short fiber
/ M ² and then entangled by a mixed hydroentangled method as (A) layer 13, entangled by hydroentangling method by mixing the rayon short fibers 45 g / m ² and high-density polyethylene short fiber 5 g / m ² Then, as (B) layer 14, (A) layer 13 and (B)
The layer 14 was joined by a hydroentanglement method to obtain a joined body. The joined body was heated and pressed against the surface of the layer (A) 13 by a calendering method to at least partially weld the layer (A) 13 to obtain a water absorbing layer 10.

On the other hand, high density polyethylene (MFR = 2 g)
/ 10 min, density = 0.958 g / cm ³ ) to form a flat yarn having a single yarn fineness of 1000 d, and a plain woven fabric 15 was obtained at a driving density of 10 × 10 yarns / inch. On one side of the woven fabric 15, low-density polyethylene (MFR = 8 g / 10 min, density = 0.9)
17 g / cm ³ ) containing a polyreflective layer 16 containing 1% by weight of metal aluminum powder as a light reflective pigment
The waterproof layer 11 provided with m by the extrusion lamination method was formed.

Next, the low-density polyethylene is used between the (B) layer 14 side of the water-absorbing layer 10 and the woven fabric 15 side of the waterproof layer 11 by a sandwich lamination method.
A dew-preventing waterproof sheet 2 as a laminate provided with a sandwich laminate layer 12 of μm was obtained. In the sandwich laminate layer 12, carbon black of a light absorbing pigment is used.
3% by weight was blended. In the water absorbing layer 10 of the dew condensation preventing waterproof sheet 2, the moisture permeability according to JISL1099 is 1
55 g / m ² · h, JISL107 on the surface of layer (A) 13
A pilling test evaluation of 6 gave a 4.

In order to form the light-shielding and breathable sheet 3, high-density polyethylene (MFR = 1.1 g / 10 mi) was used.
n., density = 0.951 g / cm ³ ), and a monofilament having a fineness of 300 d was formed using a monofilament molding die. A mesh sheet woven by using a monofilament having a fineness of 300d as a warp, a flat yarn having a fineness of 1000d and 0.4% by weight of carbon black as a weft, and a driving density of 8 x 14 yarns / inch in length and width. Was obtained. The light-shielding and breathable sheet 3 had a light-shielding ratio of 90% and a basis weight of 80 g / m ² . The monofilaments and flat yarns used in the light-shielding and breathable sheet 3 are made of carbon black 0.2 to improve light-shielding properties and weather resistance.
3% by weight was blended.

Next, the dew condensation preventing waterproof sheet 2 is
× 6 m, and the light-permeable and air-permeable sheet 3 was bonded to the four sides by 1.5 m in width, adjusted to a square of 5 × 9 m, turned around the entire periphery, and cut into eyelets 4 at 60 cm intervals.
To obtain a dew condensation preventing outdoor cover 1.

The object to be covered is a potato 8 harvested in a field and, as shown in FIG. 3, is stored for about 1 ton in a collection container 7 of 1.7 × 1.1 m in length and 1.4 m in height. 5 are collected and covered with the dew condensation preventing outdoor cover 1 obtained earlier, and as shown in FIG. 4, the collecting container 7 is passed through the eyelets 4 provided around the four sides of the cover. It was fixed to the lower part. The dew condensation preventing waterproof sheet 2 covered the ceiling 5 of the collection container 7, and the light-shielding breathable sheet 3 covered the side face 6.

The water escaping from the potato 8 stored in this manner for four days is absorbed by the dew-preventing waterproof sheet 2 or is removed due to ventilation of the cover side face 6 due to the ventilation, so that the water is discharged into the potato 8 by the dew condensation. There was no dripping, no discoloration due to the effects of light shielding and ventilation, no stuffiness due to temperature rise, and no deterioration in potato 8 quality was observed. The amount of moisture absorbed by the water absorbing layer 10 is 250 g.
/ M ² . After absorbing moisture, the water-absorbing layer 10 was easily dried by leaving it at 20 ° C. and a humidity of 40% for 2 hours, and then immediately reused, so that the initial moisture-absorbing performance could be exhibited.

[0040]

As described above, the dew condensation-preventing outdoor cover of the present invention is provided with a combination of a dew condensation-preventing waterproof sheet and a light-shielding air-permeable sheet so that an object stored outdoors can be protected from rain and rain. It has waterproofness to prevent dew, has no stuffiness due to temperature rise due to light-shielding effect and ventilation effect, and moisture emanating from the object is absorbed by the water-absorbing layer that constitutes the dew-preventing waterproof sheet, and moisture is absorbed. Water can be easily released by moisture release and reuse is possible, and it is a lightweight, high-strength anti-condensation waterproofing sheet, which can cover objects such as agricultural and marine products without stacking, Particularly, it is suitably used as a potato cover.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a dew condensation preventing outdoor cover according to the present invention.

FIG. 2 is a perspective view schematically showing a modification of FIG.

FIG. 3 is an explanatory view showing a state in which five collection containers accommodating potatoes are arranged in the collection container.

FIG. 4 is an explanatory view showing a state in which the collection container of FIG. 3 is covered with a dew condensation preventing outdoor cover of the present invention and is bound with a string.

FIG. 5 is a schematic sectional view of the dew condensation preventing waterproof sheet of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dew condensation prevention outdoor cover 2 Dew condensation prevention waterproof sheet 3 Light-shielding breathable sheet 4 Eyelet 5 Ceiling 6 Side part 7 Collection container 8 Potato 9 String 10 Water absorption layer 11 Waterproof layer 12 Sandwich laminate layer 13 (A) layer 14 (B) Layer 15 Woven cloth 16 Metallic aluminum powder-containing polyolefin layer

Continued on the front page F-term (reference) 2B100 AA03 BA08 CA02 DA06 HA17 HA20 4F100 AA37H AB10H AJ05 AK03D AK05 AK06 BA04 BA05 BA07 BA10A BA10D BA13 CA13 DE01H DG12A DG12B DG12C DG13A DG13B05 DG13B DG13A DG13B DG13A DG13A JD14H JD15A JD15B JK01 JK09A JL00 JL03 JL07 JN06H JN08H YY00A YY00B

Claims (1)

[Claims] 1. An outdoor cover for covering an object to be piled such as agricultural products, wherein the outdoor cover is formed by joining a dew condensation preventing waterproof sheet and a light-shielding gas-permeable sheet, and the light-shielding gas-permeable sheet is made of the object. In addition to being configured to cover at least a part of the side surface of the object, the dew-preventing waterproof sheet has a water-absorbing layer having the following (A):
(B) a joined body formed by joining layers, wherein the (A) layer is at least partially thermally welded and has a moisture permeability of 50 g / m
² · h or more, JISL1076 pilling test evaluation by the (A) layer surface is at least 3, conjugate (B) layer and the waterproof layer having a polyolefin layer on both surfaces or one surface of the textile fabric made of thermoplastic fibers A dew condensation-preventing outdoor cover, which is a laminated body obtained by laminating: (A) layer: Woven knitted fabric, nonwoven fabric or felt composed of 50 to 95% by weight of thermoplastic fiber and 5 to 50% by weight of hydrophilic fiber. (B) layer: thermoplastic fiber 5 to 50% by weight and hydrophilic fiber 5
A woven or knitted fabric, a nonwoven fabric or a felt composed of 0 to 95% by weight.