JPH0928205A - Covering material for agricultural facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject covering material having good light-shielding performance, heat-shielding performance, heat-retaining property, collectability in winding, surface slipperiness, strength, etc., by applying a surface film layer of a polyethylene resin having a specific density to a surface of woven fabric produced by weaving polyethylene flat yarns. SOLUTION: A surface film layer 2 of a polyethylene resin having a density of 0.930-0.945g/cm<2> (preferably 0.934-0,942g/cm<3> ) is applied to at least one surface of woven fabric 1 produced by weaving polyethylene flat yarns. The application of the surface layer 2 is carried out e.g. by melting a high-density polyethylene with a melt-extruder at 280-320 deg.C and laminating the melted polyethylene to the woven fabric 1 to a thickness of 15-60μm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a covering material for an agricultural facility which covers the ceiling or wall of an agricultural facility such as a greenhouse or a pipe house from outside or inside thereof.

[0002]

2. Description of the Related Art Conventional covering materials for agricultural facilities are film materials such as polyvinyl chloride film, polyethylene film, ethylene-vinyl acetate copolymer film, PVC yarn-containing film, Russell netting, and carami Textile materials such as woven fabrics, ginseng, split fiber non-woven fabric, spunbonded non-woven fabric, etc. are introduced. For lining, Russell netting, Karami woven fabric, ginseng, split fiber non-woven fabric, netting made of aluminum vapor deposited tape, etc. are introduced. Has been done. While each has its own strengths and some drawbacks, each of them has been improved further today, such as light-shielding property, heat-shielding property, heat-retaining property, focusing property during winding, surface slipperiness, and strength. Practical coating materials have been developed in terms of dimensional stability, incineration, flexibility, and heat sealability.

[0003]

However, in so-called agricultural facility covering materials that cover the ceiling and walls of agricultural facilities such as greenhouses and pipe houses, the spreading work and the winding work are repeatedly used. Therefore, it is unavoidable that they are gradually deteriorated due to friction with the support material such as the aggregate of the house and the support wire 23 that support them from below and prevent them from hanging down. Therefore, in order to extend the service life of the covering material, light-shielding property, heat-shielding property, heat-retaining property, focusing property during winding, surface slipperiness, strength, dimensional stability, incineration property, flexibility, and heat-sealing property are not impaired. Therefore, it was necessary to improve wear resistance.

The present invention has been made in view of the above circumstances, and has good light-shielding properties, heat-shielding properties, heat-retaining properties, focusing properties during winding, surface slipperiness, strength, dimensional stability, and incineration properties. Another object of the present invention is to provide a covering material for agricultural facilities having a long service life, which has flexibility, heat sealability and wear resistance.

[0005]

The covering material for agricultural facilities according to the present invention made to solve the above problems is a polyethylene resin having a predetermined density on at least one surface of a woven fabric formed by weaving polyethylene flat yarn. It is characterized in that a surface layer film made of is deposited. Further, a surface layer film made of the polyethylene resin may be attached to at least one of the front and back surfaces of the laminated sheet including the woven fabric layer.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the covering material for agricultural facilities according to the present invention will be described below in detail with reference to the drawings. The covering material for agricultural facilities according to the present invention has a two-layer structure of a surface layer-fabric layer (see FIG. 1) and a three-layer structure of a surface layer-fabric layer-surface layer (see FIG. 2). , A surface layer film layer-a woven fabric layer-a low density polyethylene layer-aluminum vapor deposition layer-a surface layer film layer and the like having a multilayer structure of four or more layers (see FIG. 3).

As the material resin for the surface layer film adhered to the single-layer sheet or the laminated sheet, the density (JIS K-
7112): 0.930 g / cubic centimeter or more and 0.945 g / cubic centimeter or less polyethylene resin is used, but 0.934 / cubic centimeter to 0.942 in terms of stable abrasion resistance and extrusion processability.
It is preferably g / cubic centimeter. The melt flow rate (JIS K-7210) is 4 to 20 g /
10 min is desirable.

If necessary, a UV absorber, an antifogging agent, a light stabilizer, an antifungal agent, a colorant, a resin for the surface layer film,
In some cases, algal repellents and the like are added.
The raw material resin may be kneaded in advance, or may be dry blended immediately before processing. Further, the polyethylene resin film or the woven fabric or other laminated material may be appropriately colored in order to adjust the light blocking rate.

As one of the methods for depositing the surface layer film made of the above-mentioned polyethylene resin, a melt extruder 280-320 is used.
A method of extrusion laminating a material resin heated and melted at ℃ is used. The thickness of the surface layer film is 15 μm or more and 60 μm
Taking the following as a guide, it is preferably set in the vicinity of 20 μm to 50 μm from the viewpoint of the balance between bending resistance and workability. When the thickness of the surface layer film is less than 15 μm, pinholes are easily generated and the heat seal strength is weak, but when it exceeds 60 μm,
The waist of the seat is strong and heavy, resulting in poor workability. The thickness of the surface layer film may be different on each surface of the sheet.

A surface layer film made of a polyethylene resin having a density of less than 0.930 g / cm 3 as a raw material resin is
Poor abrasion resistance causes scratches on the surface of the sheet, causing it to rupture.When laminated on aluminum vapor deposition, water penetrates from scratches on the sheet surface and corrodes the aluminum vapor deposition layer, causing cracks. This may cause deterioration in the brightness and the disappearance of the aluminum vapor deposition layer itself, resulting in poor heat insulation and poor heat retention. On the other hand, when the density of the raw material resin exceeds 0.945 g / cubic centimeter, the extrusion load becomes large.
There are problems such as poor workability and poor sheet workability. Therefore, as described above, the range of the density is limited to achieve both wear resistance and workability.

The woven fabric to which the surface layer film is applied has a flat yarn of 5 to 20 filaments / inch in the longitudinal direction and 5-2 in the transverse direction.
It is driven by 0 line / inch. The weave shape is
A plain weave, a twill weave, a twill weave, a double weave, etc. may be selected as appropriate. In the case of a plain weave, etc., the number of hammers in the direction orthogonal to the winding direction may be slightly increased in order to improve the focusing property at the time of winding. To the extent that weaving less and not hindering the adhesiveness,
A flat yarn made of a thermoplastic resin other than the polyethylene resin composition may be struck as the warp or weft of the woven fabric, and sometimes the intersections of the yarns of the various woven fabrics may be bonded. Further, although different from what is generally called a woven fabric, it is also possible to use a sof or a warif which is formed by bonding the intersections of threads without weaving the threads.

As the raw material resin of the flat yarn, for example, a polyethylene resin composition having good adhesion to the layer formed by laminating is used. Density is 0.930 to 0.970g
/ Cubic centimeter is a standard, but 0.950 to 0.960 g / cubic centimeter is preferable from the viewpoint of workability and strength. Further, the suitable range of the melt flow rate is 0.3 to 5.0 g / 10 min, and it can be said that the more preferable range is around 0.3 to 2.0 g / 10 min.

If necessary, a heat stabilizer, a coloring agent, an antioxidant, an antifogging agent, an ultraviolet absorber, an antistatic agent, a light stabilizer, a flame retardant, a lubricant, a filler, etc. may be added. is there. The compounding agent may be melt-kneaded in advance with the raw material resin of the flat yarn, or may be dry-blended immediately before processing.

The flat yarn used for weaving basically has a denier of 50 to 2500 d and a yarn width of 0.5 to 10.
The suitable range is 0 mm and yarn thickness: 5 to 80 µ, but preferable values are denier: 200 to 500 d, yarn width: 1.0 to 3.0 mm, and yarn thickness: 10 to 40 µ. The yarn may be a single layer yarn, a multi-layer yarn, a split yarn, or a lined yarn.

As a layer to be added to the covering material in order to add light-shielding, heat-shielding and heat-retaining effects, a vapor deposition layer, a colored film layer, a colored laminate layer, and a laminated layer for coloring a woven fabric can be considered. The vapor deposition layer may be formed by depositing a vapor deposition film on any of the layers included in the multilayer structure, and the same applies to the colored layer. still,
As the film to be colored, a PE film, an OPP film, a CPP film, a PET film or the like can be considered.

[0016]

EXAMPLES In the following examples, a surface layer film 2 made of a polyethylene resin composition having a predetermined density is applied to a laminated sheet 3 containing a woven fabric 1 formed by weaving flat yarn made of a polyethylene resin composition. The surface film layer (first
Surface) -fabric layer-polyethylene layer-aluminum vapor deposition layer-surface layer film layer (second surface).

The flat yarn used in this example is a low-pressure high-density polyethylene (grade manufactured by Mitsubishi Chemical Corporation).
HY330B) is extruded by a melt extruder and formed into a film by an inflation method, and the intermediate material is
azor) to a width of 3 mm, then heat stretched 7 times on a hot plate at a temperature of 110 ° C., and further subjected to 6% relaxation heat treatment at a temperature of 115 ° C. on another hot plate to give a denier of 30.
It is a uniaxially stretched product formed into 0d and a yarn width of 1.4 mm.
The flat yarn has a strength of 5.22 g / d and an elongation of 35%.

A plain weave fabric 1 was formed by striking the flat yarn with a through-loom loom at 17 yarns / inch in the longitudinal direction and 17 yarns / inch in the transverse direction.

A low density polyethylene (grade LC720 manufactured by Mitsubishi Chemical Co., Ltd.) was laminated on one side of the woven fabric 1 by a melt extrusion laminating method so as to have a thickness of 20 μm, and immediately after that, the low density polyethylene layer 4 was formed. Corona treatment is applied on top, and the thickness is about 5 after the corona treatment is applied.
An aluminum thin film having a thickness of 00 angstrom is formed by a vacuum deposition method, and further, AC (anchor coat) treatment is applied to the surface of the aluminum thin film layer 6 to obtain a polyethylene resin having the predetermined density on the front and back surfaces of the laminated sheet 3. The surface layer film 2 containing the composition as a material resin was melt-extruded to form a sample of a covering material for an agricultural facility by adhering and forming by a laminating method.

The data of the thickness of the surface layer film 2 and the material resin density of the samples obtained by the above method are shown in Table 1, and the abrasion resistance of each sample, the slipperiness of the surface, the flexibility, and the peel strength (g / The measurement result of 15 mm) is shown in Table 2. In each table, data and measurement results for a commercially available polyvinyl chloride film are also shown for comparison with the coating material according to the present invention and the conventional coating material. Samples 1 and 3 are called linear low density polyethylene,
Sample 2 is high-pressure low-density polyethylene, and sample 10 is so-called high-density polyethylene. Regarding the tensile strength measured by the maximum load at the time of cutting by pulling for a predetermined sample other than those shown in the table, Sample 6 was 55.9 (kg / 50 mm) in the longitudinal direction and 51.5 in the lateral direction.
(Kg / 50 mm), it is found that the sample 12 made of polyvinyl chloride has extremely high strength as compared with 7.0 (kg / 50 mm) in the longitudinal direction and 9.0 (kg / 50 mm) in the lateral direction. . The measuring methods for the main items will be abbreviated later.

[0021]

[Table 1]

[0022]

[Table 2]

From this table, it can be seen that Sample 1, Sample 2, and Sample 3 are out of the practical range in terms of wear resistance and slipperiness, and in terms of bending resistance, Sample 8 has a strong elasticity due to the film thickness. Too much, sample 10 is too stiff due to the material. Therefore, when the measurement sample is considered from Table 1, the density is 0.
It can be said that a material larger than 927 and smaller than 0.951 is preferable.

In the abrasion resistance test, one end of the ester wire 8 is fixed to an upright wall surface 9 as shown in FIG. 4, and a 500 g weight 10 is hung at the other end of the ester wire 8 and separated from the wall surface 9. It is carried out by hanging it on the heat roll 11 supported at the above position and heated to 80 ° C. A sample 12 was adhered to the heat roll 11, which was rotated at 10 m / min for 1 hour, and the degree of wear thereof was evaluated on a five-point scale. The evaluation standard for wear resistance is "5: no change at all, 4: slightly scratched on the surface, 3: partially peeled, 2: 5-10% peeled, 1: 10% or more peeled. It is.

The slidability is measured by the smooth plate 13 as shown in FIG.
A weight 14 having a weight of W: 243 g / 30 cm ² obtained by laying the sample 12 on the upper surface of the sample 12 and sticking the sample 12 on the lower surface of the sample 12 is attached to the side surface of the weight 14 with a steel wire 15 of 100 mm / min. Pull horizontally at speed. The static friction coefficient is derived from μs = Fs / W by measuring the tensile force Fs when the weight 14 starts moving. The dynamic friction coefficient is derived from μk = Fk / W by measuring the average Fk of the tensile force when the weight 14 slides 100 mm.

The bending resistance was measured by using a smooth horizontal table 17 having a 45 ° inclined surface 16 as shown in FIG.
5 ° cantilever method (JIS L-1096 (199
0)). That is, 2 x about 15 cm from each sample
5 pieces of each of the test pieces 18 are sampled in the vertical direction and the horizontal direction, and the short side of the test piece 18 is scaled on the horizontal base 17.
Place it according to the baseline 19 of. Next, the test piece 18 is gently slid in the direction of the inclined surface 16 by an appropriate method, and the position of the other end when the central point of one end of the test piece 18 contacts the inclined surface 16 is read by the scale 20. Bending test piece 18
It is represented by the moved length (mm), and the front and back of each of the five sheets are measured, and represented by the average value in each of the vertical direction and the horizontal direction (up to an integer).

Next, the facility gardening house 21 shown in FIG.
In addition, the lining curtain 22 made of each sample is arranged so that the spreading work and the winding work can be repeated, and in order to evaluate the spreading workability and the winding workability, the width piecing process by hot air heat sealing is performed on each sample. Then, the curtain for the lining of the greenhouse 21 for facility gardening was manufactured and examined. Table 3 shows measurement results of spreading workability, winding workability, and durability of the aluminum thin film layer 6 for each curtain 22.

[0028]

[Table 3]

From this table, the same result as the consideration according to Table 2 was obtained in which, among the coating materials according to the present invention, the trial production 1 using the sample 2 and the trial production 6 using the sample 10 were out of the practical range. However, it can be seen that even a prototype that is out of the practical range has extremely good characteristics as compared with the prototype 7 made of polyvinyl chloride.

[0030]

As described above, since the covering material for agricultural facilities according to the present invention is excellent in abrasion resistance of the sheet surface, it supports the covering material from below and prevents the loosening of the house aggregate and the support wire. The scratches are unlikely to occur even by rubbing, and the durability as a light-shielding, heat-insulating and heat-insulating material can be dramatically improved, for example, the durability of aluminum vapor deposition can be dramatically improved. Further, since the surface has good slipperiness and is not sticky, the workability in the sheet spreading work and the winding work is enhanced, and a high practical effect can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a covering material for an agricultural facility according to the present invention.

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

FIG. 3 is a cross-sectional view illustrating an example of a covering material for an agricultural facility according to the present invention.

FIG. 4 is a side view showing a means for measuring wear resistance.

FIG. 5 is a perspective view showing a slipperiness measuring unit.

FIG. 6 is a perspective view showing a measuring device for bending resistance.

FIG. 7 is a cross-sectional view showing an arrangement example in a facility gardening house.

[Explanation of symbols]

 1 Woven fabric 2 Surface layer 3 Laminated sheet

Claims (2)

[Claims] 1. A woven fabric (1) formed by weaving a polyethylene flat yarn, has a density of 0.
A covering material for an agricultural facility, characterized in that a surface layer film (2) of a polyethylene-based resin of 930 g / cubic centimeter or more and 0.945 g / cubic centimeter or less is applied. 2. A polyethylene sheet having a density of 0.930 g / cubic centimeter or more and 0.945 g / cubic centimeter or less on at least one surface of a laminated sheet (3) including a layer of a woven fabric (1) formed by weaving a polyethylene flat yarn. A covering material for an agricultural facility, characterized by being coated with a resin surface layer film (2).