JPH0432935Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a support used for agricultural tunnel cultivation (hereinafter referred to as a tunnel support).

[Conventional technology]

Conventionally, various types of supports have been used for tunnel cultivation, including split bamboo, synthetic resin-coated steel pipes, and synthetic resin-coated iron wire. Split bamboo requires splitting natural bamboo one by one, which not only requires time and effort from cutting the bamboo to processing, but also increases costs. Therefore, products made of synthetic resin-coated steel pipes and synthetic resin-coated iron wires that could be mass-produced were developed, but these had the following drawbacks.

[Problem that the invention attempts to solve]

First, if a steel pipe is used as the core material,
The shape of the pillar must be bent in advance into an arch shape or tunnel shape (semicircular shape), and although this is not a problem in practical use as a tunnel support, it does have the disadvantage of requiring a large amount of space during transportation and storage. It was hot. On the other hand, when using a wire rod with repulsive force such as hard steel wire as the core material,
When not in use, it is straight, but when used as a tunnel support, it is bent. However, in this case, the support is linear and thin, so it is unstable when in use, and gives the impression that it is weak in strength. It was something that gave.

Therefore, it has been proposed to make the synthetic resin part into a flat or elliptical shape, but if the resin shape is made into a large flat or elliptical shape, the weight of the entire support becomes large, making it unnecessary to carry it. For this reason, attempts were made to use the strong metal wire for the core material and to use as thin a wire as possible, and to make the synthetic resin part a foam, but the adhesion between the core material and the resin part was extremely poor, and as a result, synthetic resin The resin part became detached from the core material and twisted, making it difficult to use as a tunnel support.

The purpose of this invention is to solve these problems by providing a support for tunnel cultivation that is light and easy to carry, has strength and stability during use, and can be transported and stored in a small space. .

[Means for solving problems]

In order to achieve the above object, the present invention covers the outer periphery of a hard steel wire with a polyvinyl chloride resin layer via an adhesive, and further coats the outer periphery with a low-foamed polyvinyl chloride resin layer so that the cross section has a substantially elliptical shape. It is made by covering.

[Effect]

According to the support for tunnel cultivation with the above configuration, the core material of the support is a hard steel wire, so if you bend the support and insert both ends into the edges of the ridge, the repulsion force is large, so it draws a certain arc shape, and the film, etc. By covering it, an orderly tunnel hotbed can be created.

In addition, since the outer periphery of the hard steel wire is coated with polyvinyl chloride via an adhesive, and a low-foaming vinyl chloride resin is coated on top of that, the first layer of polychloride is coated on the hard steel wire, which is the core material. The vinyl resin layer is firmly fixed with adhesive, and the polyvinyl chloride resin layer is closely covered with a foam layer of the same quality, so that everything from the core material to the outer foam layer is completely integrated. ,
Even if the overall shape is approximately elliptical, the struts do not twist and can be stably erected on the ridges. In addition, despite the large cross-sectional shape of the pillars, the foam layer reduces the overall weight and gives a strong impression.
In addition, the surface of the support is appropriately non-slip and has a large surface area, so it is easy to hold a film or the like without damaging the film.

〔Example〕

Examples of the present invention will be described in detail below.

Fig. 1 is a perspective view of the support for tunnel cultivation of the present invention, Fig. 2 is an enlarged sectional view taken along line A-A of Fig. 1, and Fig. 3 is a perspective view showing the state of use of the support for tunnel cultivation of the present invention. . In FIG. 2, 1 is the tunnel support of the present invention, and 2 is a hard steel wire. The hard steel wire has a high bending strength, and when the both ends of the support 1 are erected so as to straddle the ridge, it forms a substantially semicircular arc. The thickness of hard steel wire 2 is 2~
It is 5mm.

3 is an adhesive layer, which is not particularly limited as long as it is suitable for adhering polyvinyl chloride. In terms of cost and ease of use, polyvinyl acetate and polyvinyl chloride dissolved in a solvent are preferable.

Reference numeral 4 denotes a non-foamed polyvinyl chloride resin layer, which is tightly covered with the adhesive layer 3 described above. This unfoamed polyvinyl chloride layer 4 must have a thickness of at least 20 microns; if the thickness is less than 20 microns, the foaming agent described below will come into direct contact with the adhesive layer or hard steel wire, and during long-term use, the There are some cases where twisting occurs. Therefore, the polyvinyl chloride resin layer preferably has a thickness of 20 to 50 microns.

Next, 5 is a low foaming polyvinyl chloride layer, and its long axis L is 6 to 15 mm, and the short axis H is 4 to 7 mm, which is the easiest size to handle, but it is not necessarily limited to these thicknesses. In addition, the foaming ratio is 1.3~
Twice as much is desirable. If the foam is less than 1.3, the surface texture and weight reduction of the foam will not be visible, and if the foam is more than double the foam, the surface will become rough and the product value will be lost.

Next, the manufacturing method of the tunnel support of the present invention will be briefly described. First, scale and rust are removed from the surface of a hard steel wire, and then the wire is passed through an adhesive bath, and immediately after that, the surface is dried. Then, it is passed through a crosshead die for coating non-foaming polyvinyl chloride resin and a crosshead die for coating low foaming polyvinyl chloride resin, and then passed through a cooling process to the desired length (1.5m~ 3.5
The tunnel support of the present invention can be made by cutting it into pieces m). FIG. 3 shows a tunnel support 1 erected on a ridge 8 and covered with a synthetic resin film 6.

[Effects of this invention]

Since the outer periphery of the tunnel support of the present invention is made of a foam layer, the surface is soft and the film can be easily secured to the support without damaging the film. Moreover, the cross-sectional shape is approximately elliptical,
Coupled with the fact that it has a hard steel wire in the center, when the tunnel support of this invention is erected in an arch shape on a ridge, it is extremely stable, just like when split bamboo is erected. It has the advantage of being straight when not in use and can be stored in a small space.

Also, since it has a large foam layer, it looks thick and gives an extremely strong impression, and it is also lightweight, making it convenient to carry a large amount at once. and,
The central hard steel wire, adhesive layer, polyvinyl chloride resin layer, and low-foaming polyvinyl chloride layer are all in close contact with each other, so twisting does not occur even though the low-foaming layer is approximately elliptical. It has the advantage that it can be used for a long period of time.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the tunnel support of the present invention;
The drawings are an enlarged cross-sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a perspective view showing the state in which the tunnel support of the present invention is used. 1... Tunnel support, 2... Hard steel wire, 3... Adhesive layer, 4... Polyvinyl chloride resin layer, 5... Low foaming polyvinyl chloride resin layer.

Claims (1)

[Scope of utility model registration request] A support for tunnel cultivation comprising a hard steel wire whose outer periphery is coated with a polyvinyl chloride resin layer via an adhesive, and the outer periphery is further covered with a low-foamed polyvinyl chloride resin layer so that the cross section has a substantially elliptical shape.