JP2869151B2 - Synthetic resin sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a synthetic resin sheet particularly suitable for a covering material for crop cultivation.

<Conventional technology> The role of the covering material for crop cultivation in improving agricultural production in Japan in recent years has been extremely large. However, this coating material was not really satisfactory for the user in its effect, durability and cost.

In particular, no matter how good the crop production effect is, if there is a problem with durability, not only the production cost will be high, but also the work of spreading the covering material will be doubled and it will be very troublesome for the user. Was something.

2. Description of the Related Art Conventionally, agricultural covering materials generally refer to sheet materials such as films, cold gauze, nets, and the like used for tunnel covering, shelf covering, lining of facility horticultural houses, lining curtains and the like for open-field cultivation. , The composition is also different, and the types are various.

Japanese Patent Application Laid-Open No. 61-31027 discloses that a large number of warp knitting yarns are arranged in a plane, and between the chain knittings, a large number of weft insertion yarns are provided at a plurality of turn portions with respect to an adjacent chain knitting. A curtain piece made of a reflective film such as an aluminum foil having a width between the chain stitches between the chain stitches and the insertion yarns of the front and back portions is formed on the same plane. There has been proposed a heat-insulating curtain that is formed so as to be inserted in a shape.

However, this curtain requires one set of a creel portion and a chain knitting mechanism for paying out the warp in order to form a knitted fabric, and furthermore, the weft incorporated between the chain stitches inserts the front and back to insert the curtain pieces. (Front / Back) Two wires are required, and two sets of the creel part and the knitting mechanism for feeding the yarn are required. As described above, the yarn feeding device for forming the knitted fabric has a total of 3
It requires one set and one set of creels to insert curtain pieces. Four sets of thread (including curtain pieces)
Management is required. Therefore, the device itself has a disadvantage that it is very large.

Further, considering the production cost for producing curtain pieces such as aluminum foil, there is a disadvantage that much cost is required for vapor deposition of aluminum on a synthetic resin film, slitting and winding of the film.

<Problems to be Solved by the Invention> The present inventors have made intensive studies in view of the above-mentioned drawbacks of a synthetic resin sheet suitable for an existing covering material for crop cultivation, and have completed the present invention. An object of the present invention is to provide a synthetic resin sheet having an excellent covering effect and high durability.

<Means for Solving the Problems> The object described above is to arrange a large number of warp knitted chains (1) in parallel and to insert a large number of weft inserted yarns (2) between the chain knits (1). By incorporating a plurality of turns (3) into the adjacent chain stitch (1), an insertion structure is formed, and between the chain stitch (1) and the insertion yarn of each front and back part. A net-like body (4) obtained by splitting a polyvinyl alcohol-based synthetic resin coated body is over-fed,
This is achieved by a synthetic resin sheet characterized by being interposed and integrated on the same plane.

In the present invention, it is important that a chain knit using one set of warp and a front (front) and back (back) insert yarn (serving as a holding yarn) using two sets of wefts. In the gap,
This is to insert and integrate a web (web) obtained by splitting a synthetic resin film body in the same plane. That is, when attempting to produce a synthetic resin sheet having a small porosity, it is not necessary to prepare a large number of curtain pieces in the width direction together with the creel portion, and one or a small number of wide net-like bodies may be fed out. That is the point.

Examples of the material of the yarn constituting the knitted fabric applied to the present invention include synthetic resin fibers such as polyester, polyolefin, polyamide, polyvinyl alcohol, and polyacrylonitrile; filaments and staple yarns of chemical fibers such as rayon and acetate; and cotton. Staple yarns of natural fibers such as hemp, hemp, etc., and from the viewpoint of strength, weather resistance and cost, multifilaments made of polyvinyl alcohol (vinylon) or polyethylene monofilaments containing a weathering agent are preferred.

Next, as the synthetic resin film constituting the synthetic resin network applied to the present invention, a polyvinyl alcohol film is preferable in terms of heat retention, moisture absorption, moisture permeability, dehumidification, transparency, and weather resistance.

The polyvinyl alcohol network suitably used in the present invention is obtained by stretching, splitting, and heat-treating a polyvinyl alcohol film. These polyvinyl alcohol networks can be obtained by a known appropriate method.

For example, the average degree of polymerization is 1,000 or more,
Saponification degree 98.5% or more, more preferably, average polymerization degree 1,400
Above, polyvinyl alcohol having a saponification degree of 99.5% or more is formed into a film by a known appropriate method such as a casting method, an extrusion method, and a coagulation method.
After stretching by 6.5 times and splitting using a razor splitter or the like, the net obtained by performing heat treatment at 200 ° C. or higher, if necessary, is wound up in an unexpanded state,
Alternatively, in order to adjust the winding width, it is obtained by slightly widening and winding using an interference bar (R bar).

Here, at least 80% or more of the split fibers constituting the polyvinyl alcohol network generally have a width of 0.5 mm or more, more preferably 1.0 mm or more, from the viewpoint of strength. Also, the split fiber must have a maximum width of 10 mm or less, more preferably 3.
It must have a width of 0 mm or less.

Next, an example of a specific embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram of a synthetic resin sheet showing one embodiment of the present invention. In the figure, (1) is a row of separated chains (wells), (2) is an inserted yarn between wells, (3)
Represents a net obtained by splitting a synthetic resin film between the well (1) and the insertion yarn (2) for each of the front and back sides. or,
(1a), (1b) and (1c) show the first, second and third wells,
At the position of the second well of (1b), the first pattern part (3), the third turn part (3b), and (2b) of the first insertion yarn of (2a)
The second turn part (3a) and the fifth turn part (3
With the mode in which d) is located and its repetition, the third and subsequent yarns of (2c) are sequentially woven by the same procedure.

Since the mesh body (4) inserted and integrated in the gap formed by the well (1) and the insertion yarn (2) is split, a uniform fine slit (5) is formed on the surface of the film body. ) Is open.

At this time, the reticulated body (4) is overfeed and interpolated,
When the bulk is increased, the meshes are clogged, and the heat insulation and the heat retention are improved. In addition, the texture is improved and the durability is improved. Further, when the PVA splitting cloth is used as the net, the shrinkage is remarkable under the wet condition, but when the overfeed ratio is 1.1 or more, the shrinkage hardly occurs.

<Effects of the Invention> According to the present invention, a heat insulation / insulation curtain in which curtain pieces made of a synthetic resin film are mixed in gaps of an existing knitted fabric requires management of a large number of curtain pieces in a manufacturing process. On the other hand, in the present invention, it is possible to manufacture a synthetic resin sheet by managing one to a small number of synthetic resin film nets.

In addition, if polyvinyl alcohol is used as the synthetic resin mesh to be inserted and integrated, the transparency of the material can be improved.
When used for cultivation of crops because of its heat retention and dehumidification properties, it has excellent effects such as promoting the growth of crops and preventing the occurrence of illness, such as reducing the frequency of application of pesticides.

Furthermore, the porosity of the net of the synthetic resin film can be arbitrarily set by adjusting the winding width of the split web, and the control of air permeability is easy.

In addition, if the synthetic resin film body is kneaded and colored with aluminum as needed, there is an excellent effect of shading and cooling of crop cultivation in summer.

As described above, the synthetic resin sheet according to the present invention is a sheet having excellent covering effect and high durability due to the knitted fabric.

 Hereinafter, the present invention will be described specifically with reference to examples.

Example 1 One set of 300d polyethylene monofilament containing a weathering agent was used for the warp, and a total of three sets of front and back were used for the inserted yarn.
A knitted fabric as shown in FIG. 1 was constructed. During its production,
The polyvinyl alcohol film is stretched 6 times at 200 ° C, and 1m as shown in Fig. 1 using a razor splitter.
The mesh (5), split to a width of m and heat-treated at 200 ° C, is inserted and inserted.
This was integrated to obtain a synthetic resin sheet. The synthetic resin sheet showed an excellent effect for crop cultivation due to the heat retention, moisture absorption, and transparency of polyvinyl alcohol as compared with the existing synthetic resin sheet. In addition, it has excellent durability due to the impact resistance and strength of the knitted fabric, and has the advantage that it can be produced by managing only one synthetic resin net compared to existing synthetic resin sheets. Had.

Example 2 One set of 1000d vinylon multifilament was used for the warp, and two sets of front and back sides were used for the inserted yarn, for a total of three sets, thereby forming a knitted fabric as shown in FIG. During the production, the polyvinyl alcohol film was stretched 6.5 times at 210 ° C., split using a razor splitter to a width of 1 mm as shown in (5), and
After widening the width by 1.2 times with a bar, heat-treating at 200 ° C, then dipping in a solution of aluminum powder dispersed in an aqueous solution of polyvinyl alcohol, drying and shading rate
A 50% aluminum kneaded net was obtained. The synthetic resin sheet is
Compared to the existing synthetic resin sheet, which is an aluminum vapor-deposited film, aluminum is less likely to fall off and discolor, and has an excellent effect on coolness and durability in summer. In addition, the production efficiency did not require expensive means such as aluminum evaporation, and was easy to manage.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of a configuration of a main part of an existing heat-insulating curtain. (1), (1a), (1b), (1c) ...: Chain stitch, (2), (2a), (2b), (2c) ...: Insertion thread, (3), (3a), (3b) ), (3c), and (3d) ...: turn part, (4): mesh, (5): slit.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A01G 9/14 A01G 13/02

Claims (1)

(57) [Claims] 1. A large number of chain stitches (1) made of warp are arranged in parallel, and between the chain stitches (1), a large number of insertion yarns (2) made of weft are arranged with respect to an adjacent chain stitch (1). Then, the insertion structure is formed by the incorporation to form a plurality of turn portions (3), and a polyvinyl alcohol-based synthetic resin coating is formed between the chain stitch (1) and the insertion yarn of each of the front and back portions. Overfeed the reticulated body (4) obtained by splitting,
Synthetic resin sheet characterized by being inserted and integrated in the same plane.