JPH09252656A - Covering material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a covering material having excellent transparency and light transmission, provided with the sliding characteristic and flexibility of a sheet surface for improving the operability of a stretching work, rolling up and down works, and appropriately provided with a pulling intensity, size stability, heat sealing characteristic, water proof, weather resistance, incineration property, etc. SOLUTION: Double flat yarns 3 consisting of an inner layer 1 being an extension tape made from thermoplastic synthetic resin and an outer layer 2 using thermoplastic synthetic resin the fusing point of which is lower than that of the inner layer 1 are arranged vertically and horizontally. Then a polyethylene resin composition of >=0.930g/cm<3> to <=0.945g/cm<3> density is fusion- adhered to a foundation cloth 5 to which the crossing part 4 of the double flat yarn 3 is fusion-adhered, thereby obtaining the covering material on which the surface layer film 6 of the polyethylene resin composition is formed on at least one side of the foundation cloth 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a covering material which is mainly provided on a ceiling surface or a wall surface of an agricultural facility such as a greenhouse for gardening or a pipe house and constitutes a ceiling or a side wall of the agricultural facility.

[0002]

2. Description of the Related Art Conventional coating materials are more transparent, light transmissive, and heat retaining than synthetic resin films of other thermoplastic resins.
A polyvinyl chloride resin film (hereinafter referred to as "agricultural film") which is superior in durability and the like is widely and generally used.

[0003]

However, in the agricultural film, the plasticizer contained in the film bleeds on the film surface during use or dust adheres to the film surface.
There is a problem that the transparency and the light transmittance are sharply lowered due to occasional scratches. Moreover, since the weight of the sheet is heavy and the slipperiness on the surface of the sheet is inferior, the workability in the spreading work and the work for winding / lowering is poor, and the disposal is complicated.

The present invention has been made in view of the above-mentioned circumstances, and has excellent transparency and light transmittance, and has a smooth surface of a sheet in order to improve workability of spreading work and winding / lowering work. An object of the present invention is to provide a covering material that is flexible, has a high tensile strength, and has suitable dimensional stability, heat sealing properties, waterproof properties, weather resistance, incineration properties, and the like.

[0005]

Means for Solving the Problems The coating material according to the present invention made to solve the above problems uses an inner layer which is a stretch tape made of a thermoplastic synthetic resin and a thermoplastic synthetic resin having a melting point lower than that of the inner layer. The polyethylene resin composition having a density of 0.930 g / cubic centimeter or more and 0.945 g / cubic centimeter or less is formed on the base fabric in which the multi-layer flat yarn including the outer layer is vertically and horizontally arranged, and the intersection of the multi-layer flat yarn is fused. And a surface layer film of the polyethylene resin composition is formed on at least one surface of the base cloth. The multi-layer flat yarn, an inner layer using a thermoplastic synthetic resin having a higher melting point than the polyethylene resin composition used for the surface layer film, and a thermoplastic synthetic resin having a lower melting point than the polyethylene resin composition used for the surface layer film. You may comprise with the outer layer used.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a covering material according to the present invention will be described below in detail with reference to the drawings. This covering material is a multi-layer flat yarn 3 formed by providing an outer layer 2 made of a thermoplastic synthetic resin having a melting point lower than that of the stretched tape (hereinafter referred to as an inner layer 1) on both sides of a stretched tape of a thermoplastic synthetic resin. The cloth 5 is woven and the surface layer film 6 is formed by fusing the polyethylene resin composition to one surface (see FIG. 1) or both surfaces (see FIG. 2) of the base cloth 5.

As a preferable resin for the outer layer 2 of the multi-layered flat yarn 3, a polyethylene resin composition having good adhesiveness to the surface layer film 6 can be mentioned. As properties, those having a density of 0.880 to 0.940 g / cubic centimeter, a relatively low melting point of 90 ° C. to 125 ° C., and a melt flow rate (JIS K-7210) of 1.0 to 10 g / 10 min. Is appropriate. On the other hand, the inner layer 1 of the multilayer flat yarn 3 has a higher melting point than the resin used for the outer layer 2, that is, a density of 0.930 to
About 0.970 g / cubic centimeter, 130 ° C ~
Polyethylene resin having a melting point of 140 ° C is suitable, but from the viewpoint of workability and strength, melting point: 130 ° C to 136 ° C.
It is preferable to select the one. The melt flow rate is preferably 0.3 to 1.5 g / 10 min. Since the inner layer 1 needs to have at least a function as a reinforcing material (tensile strength), a uniaxially stretched tape is used.

The resin used for the outer layer 2 and the inner layer 1 may be optionally added with a heat stabilizer, an antioxidant, an ultraviolet absorber, a light stabilizer, a flame retardant, a filler and the like. The additives may be melt-kneaded in advance with the material of the multi-layer flat yarn 3 or may be dry-blended immediately before processing, and in the ratio of the thickness of the outer layer 2 to the inner layer 1, The outer layer 2 is 10 to 25% of the total
It should be about the degree.

As the multilayer flat yarn 3 suitable as the base fabric 5 of the coating material according to the present invention, denier: 50 to 2
000d, thread width: 0.5 to 5.0 mm, thread thickness: 5
40 μm and the like can be mentioned. The shape of the weave using the flat yarn 3 may be appropriately selected from plain weave, twill weave and the like. The number of warp and weft threads is 4 to 50 / inch in the warp direction and 4 to 50 / inch in the weft direction.
Inches are suitable, especially in the case of plain weave, in order to improve the convergence at the time of winding, the number of units per unit length driven in the direction perpendicular to the winding direction may be slightly reduced,
If necessary, a single-layer flat yarn made of a polyethylene-based resin composition or the multi-layered flat yarn 3 made of a thermoplastic resin other than the polyethylene-based resin composition is used as a warp or a weft of a woven fabric to form a base fabric 5 as needed to enhance strength. Surface layer 6
Although it may be driven to such an extent that it does not impair the adhesiveness with, the non-woven fabric formed by aligning warp yarns and weft yarns without woven the flat yarn 3 may be used as the base fabric 5. The flat yarns 3 do not necessarily need to run orthogonally or side by side, and may be laid vertically and horizontally. When the flat yarn 3 has a structure in which the flat yarns 3 run orthogonally or in parallel, the space between the adjacent warp yarns and the weft yarns may be hardly provided, for example, a gap of about 0.1 to 1.5 mm may be provided. .

As one of the methods for fusing the polyethylene resin composition to the base cloth 5, there is a melt extrusion laminating method. Specifically, for example, while extruding the material of the surface layer film 6 melted at 280 ° C. to 320 ° C. from the extruder,
The base cloth 5 is pressure-bonded to one side or both sides by a cooling roll or the like called a mirror roll (mirror roll) having a surface roughness of about s to 1.0 s. At the time of pressure bonding, the melted resin composition penetrates into the voids of the flat yarn 3 forming the base cloth 5 and is integrated as a substantially transparent sheet, and a surface layer film having a smooth surface on one or both sides of the base cloth 5. 6 is formed. In order to further increase the transparency of the coating material according to the present invention, it is desirable to apply the surface layer film 6 on both front and back sides.

Further, the fusion of the intersecting portions 4 of the warp yarns and the weft yarns of the base cloth 5 can be performed after weaving the base cloth 5, and the melting point of the outer layer 2 of the multi-layer flat yarn 3 can be set to the surface layer. When the surface layer film 6 is applied by the above-mentioned manufacturing method after being set sufficiently lower than the melting point of the film 6, a means for simultaneously forming the surface layer film 6 and fusing the intersection 4 of the warp yarn and the weft yarn of the woven fabric by the heat. Is also possible. The material of the outer layer 2 of the flat yarn melted by heat penetrates into the gap between the warp and the weft to form the base fabric 5 as a single transparent sheet, and is composed of a polyethylene resin of relatively high density, which causes peel strength. In relation to the surface layer film 6, it also functions as an adhesive and also plays a role of increasing the peel strength between the layers constituting the coating material. Multilayer flat yarn The ratio of the thickness of each layer is outer layer: inner layer:
Outer layer = 1: 8: 1 to 4: 8: 4 is a suitable range,
In order to enhance the above function, it is desirable that the ratio of the outer layer is higher, such as 3: 8: 3 to 4: 8: 4.

A plurality of coating materials according to the present invention were prepared as samples having different thicknesses of the surface layer 6 and material densities (JIS K-7112), and tensile strength, friction coefficient, transparency and scratch resistance of the sheet surface were measured. Consider the results. In each table, data of a commercially available polyvinyl chloride film is also shown in order to compare the properties with the coating material according to the present invention.

The multi-layer flat yarn constituting the sample is 100 parts by weight of a low-pressure high-density polyethylene (density: 0.952 g / cubic centimeter, melt flow rate: 0.6 g / 10 min) manufactured by Mitsubishi Chemical Co., Ltd. and a hindered amine. 0.1 parts by weight of a light stabilizer was added and sufficiently kneaded was used as an inner layer material. The high-pressure low density polyethylene (density: 0.926 g /
Cubic centimeter, melt flow rate: 4.2 g /
10 min) 100 parts by weight of hindered amine light stabilizer 0.1 parts by weight, and oleic acid amide as a lubricant of 0.1 part by weight.
1 part by weight of talc as an inorganic filler was appropriately added and sufficiently kneaded to be used as a material for the outer layer 2. Then, these are extruded by using two melt extruders, respectively, and a film is formed by a multilayer inflation method so that the thickness ratio becomes outer layer: inner layer: outer layer = 1: 8: 1. After cutting it to a predetermined width using a hot plate at 115 ℃ in the take-up direction 7.0
Double heat stretching and 8.0% at 100 ℃ on another hot plate
Denier: 1000 by applying relaxation heat treatment
d, thread width: 3.0 mm, thread thickness: 40 μm, strength:
The uniaxially stretched product was 5.0 g / d and the elongation was 30.0%.

For each sample, this flat yarn was 7.6 yarns / inch in the warp direction and 7.
A plain weave base fabric was prepared by weaving 6 lines / inch in a lattice pattern, and the intersections were fused together. Then, the polyethylene resin composition was applied to the base fabric at a thickness of 25 μm from the surface of the base fabric, and was substantially constant over the entire surface. It is fused so that The polyethylene resin composition to be fused to the base fabric is set to have a density of 0.930 g / cubic centimeter or more and 0.945 g / cubic centimeter or less, and 100 parts by weight of the resin composition and 0.2 parts of a hindered amine light stabilizer. The mixture was sufficiently kneaded with parts by weight.

The transparency evaluation is expressed by the haze (unit:%) measured by using Haze METER manufactured by Toyo Seiki Seisakusho Co., Ltd., and the slip property is measured by the static friction coefficient and the dynamic friction coefficient using the apparatus shown in FIG. It was evaluated by In this apparatus, a sample 8 is laid on a smooth plate 7, and the same sample 9 is stuck on the entire surface of the lower surface, and a weight W: 243.
g / 30 square centimeter weight 10, steel wire 11
In the static friction coefficient, the tensile force Fs when the weight 10 starts to move is measured and derived from μs = Fs / W.
Regarding the dynamic friction coefficient, when the weight 10 slides 100 mm, the average Fk of the tensile force during that period is measured, and μk = Fk
Lead from / W.

As shown in FIG. 4, the sheet surface scratch test is performed by fixing one end of a holding obi 12 having a width of about 10 mm to an upright wall surface 13 and supporting the holding obi 12 at a position separated from the wall surface 13. Hang on, press foot 1
The weight 15 of 500 g is hung on the other end of 2. As the presser foot 12, the same thing as a band-shaped band that presses the side curtains so as not to flutter with the wind in a greenhouse for facility use is used. The sample 16 was adhered to the heat roll 14 and was rotated at 10 m / min for 1 hour while being heated to 80 ° C., and the wear condition of the sample 16, that is, the scratch resistance was evaluated in five levels. The scratch resistance was evaluated as ◯: no change, Δ: less than 10 fine scratches were generated, and ×: scratches were generated on the entire surface.

[0017]

[Table 1]

[0018]

[Table 2]

Next, in order to evaluate the workability of the hoisting work and the hoisting work, a prototype of the side curtain 17 made of each sample was manufactured, and the depth of the facility gardening house 18 shown in FIG.
It was installed over 0 m and the workability of winding and lowering and the sustainability of transparency were observed for each prototype. Table 3
Shows the result.

[0020]

[Table 3]

As described above, from the results of various evaluations, as to scratch resistance, Samples 4 to 7 are excellent, and the respective friction coefficients showing slipperiness are also confirmed, but the remaining Samples 1 to 3 and Sample 8 are Also, the scratch resistance and slipperiness of the sheet surface are inferior. On the other hand, regarding the workability of winding and lowering, the prototype 1 using the sample 2, the prototype 2 using the sample 4 and the prototype 3 using the sample 6 are superior, but the focusing property at the time of winding , The prototype 2 and the prototype 3 are excellent. Considering that the prototype 2 and the prototype 3 are also outstandingly superior to other prototypes in terms of the useful life of transparency, if the samples that are judged comprehensively and judged to be out of the practical range are discarded, It is considered preferable to make side curtains using 4-6.

Therefore, considering that the properties of the surface layer film 6 have a greater effect on workability than the properties of the base fabric 5, the base fabric 5
The density of the polyethylene resin composition of the surface layer film 6 adhered to the base fabric 5 is preferably higher than 0.927 and lower than 0.951 regardless of the material of the inner layer of the multi-layer flat yarn constituting the Can be said. Among them, the density: 0.
Those of 934 g / cubic centimeter to 0.942 g / cubic centimeter are desirable in that they have high abrasion resistance and stable extrusion processability, and the melt flow rate is 4
-20 g / 10 min is desirable.

That is, when the surface layer film 6 is formed using a polyethylene resin composition having a density of less than 0.934 g / cubic centimeter, the surface of the covering material tends to be easily scratched due to poor wear resistance and lubricity. Yes, it causes the deterioration of transparency to be accelerated. In addition, during the winding and lowering work, the workability tends to be deteriorated due to poor lubricity of the surface of the covering material. On the other hand, the density of the resin composition is 0.94
If it exceeds 2 g / cubic centimeter, problems such as deterioration of workability such as increase of extrusion load and deterioration of workability of spreading due to increased rigidity of the sheet occur.

Incidentally, an ultraviolet absorber, a light stabilizer, an antifogging agent, an antifungal agent, a coloring agent, an algaeproofing agent and the like may be appropriately added to the resin composition forming the surface layer film 6 if necessary. However, in that case, they may be kneaded in advance with the resin composition or may be dry blended immediately before processing.

The thickness of the surface layer film 6 is 15 μm or more 6
0 μm or less is suitable, and a more preferable range is 20 μm to 50 μm in which the flexibility and workability are well balanced.
Is mentioned. Further, the surface layer film 6 adhered to the front and back of the base cloth 5
May have different thicknesses, but if the thickness is less than 15 μm, not only pinholes are easily generated, but also the heat sealability is deteriorated. On the other hand, when it exceeds 60 μm, the rigidity of the sheet becomes excessively strong, which causes a deterioration in workability.

[0026]

As described above, the coating material according to the present invention is
Because of the excellent scratch resistance of the sheet surface, the support material that supports the covering material from the side, for example, the aggregate of the house that can prevent slack, and the scratches are less likely to be scratched by rubbing against the pressing obi, etc. The durability period of the sex is dramatically improved,
Combined with the high peel strength, the durability of the side curtain material can be dramatically improved. In addition, since the surface has good slipperiness and there is no stickiness, workability in sheet spreading work, winding, and lowering work is also improved, including use in agricultural facilities such as facility gardening houses and pipe houses, etc. It is also highly practical when used in construction sites and other material storage areas.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a covering material according to the present invention.

FIG. 2 is a sectional view showing an example of a covering material according to the present invention.

FIG. 3 is a plan view showing an example of a covering material according to the present invention.

FIG. 4 is a perspective view showing a slipperiness measuring unit.

FIG. 5 is a side view showing a means for measuring wear resistance.

FIG. 6 is a perspective view showing an arrangement example in a facility gardening house.

FIG. 7 is a main part perspective view showing an example of a flat yarn used in the present invention.

[Explanation of symbols]

 1 Inner layer 2 Outer layer 3 Multi-layer flat yarn 4 Intersection 5 Base cloth 6 Surface layer membrane

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Etsuo Ueki 2000 Tsukukake, Kurobe City, Toyama Prefecture Diatex Co., Ltd. Kurobe Factory

Claims (2)

[Claims] 1. A multi-layer flat yarn (3) comprising an inner layer (1) as a stretch tape made of a thermoplastic synthetic resin and an outer layer (2) using a thermoplastic synthetic resin having a melting point lower than that of the inner layer (1). A base cloth (5), which is arranged longitudinally and laterally and is fused with the intersecting portion (4) of the multilayer flat yarn (3), has a density of 0.930.
A covering material comprising a surface layer film (6) made of a polyethylene resin composition of g / cubic centimeter or more and 0.945 g / cubic centimeter or less, which is formed on at least one surface of the base fabric (5). 2. The inner layer (1) in which the multilayer flat yarn (3) uses a thermoplastic synthetic resin having a higher melting point than the polyethylene resin composition of the surface layer film (6), and the polyethylene of the surface layer film (6). The coating material according to claim 1, which comprises an outer layer (2) made of a thermoplastic synthetic resin having a melting point equal to or lower than that of the resin composition.