JP2571092Y2 - Thermoplastic resin strip assembly - Google Patents

Description

[Detailed description of the invention]

[0001]

This invention relates to a lightweight construction material, civil engineering drainage material such as ventilation in the longitudinal direction to be used for, relates to a thermoplastic resin strips sliding piece assembly with a water passing property.

[0002]

As shown in FIG. 10 described in the BACKGROUND ART JP-B 58-9745 and JP-thermoplastic resin strips by Surikyoku fused integrated so the strips slide track assemblies are known . However the strip sliding track assembly, as shown in the FIG. 11, each strip which is fused is separated, bending strength with it
However, there is a defect that the drainage effect is impaired due to weakness and voids in the outer peripheral portion.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional thermoplastic resin slidable assembly and reduces the bending strength.
An object of the present invention is to provide a resin slender bent aggregate having a large and good drainage performance.

[0004]

SUMMARY OF THE INVENTION The present invention relates to the above-mentioned conventional problems.
It was a result of intensive research, is a molded body in which a number of strips made of a thermoplastic resin are integrally formed, the inside of this strip is wavy in the length direction, each strip is made to partially contact fusing, the outer peripheral portion irregular voids are molded in the longitudinal direction between the strips is substantially closed is mutually fusion bonded in the longitudinal direction of the strip This is a thermoplastic resin strip bent assembly.

Next, the present invention will be described with reference to the drawings. FIG.
FIG. 2 is a perspective view showing an example of the present invention. As shown in FIG. 2, the inside of the resin foamed thin slidable body 1 is slid into individual pieces as shown in FIG. Only a part of them is fused with each other to form a gap 3 in the longitudinal direction. On the other hand, the outer circumferential strips 2 are completely fused to each other over the length direction to form a substantially closed circumferential surface. Since there is no void in the peripheral surface, the drainage does not permeate from the peripheral surface, and a good drainage effect can be obtained. The respective die holes 4 of the extrusion die suitable for making the assembly of the present invention are densely arranged at the peripheral surface and coarsely spaced at the central part. Using this die, only the central portion is slid in each of the strips, and the outer portion is not slid in the outer portion, and the strips are fused to each other over the length direction by expansion caused by the resin when exiting the die. To still,
The thermoplastic resin is polystyrene, polyethylene or polypropylene or a copolymer or a mixture of these resins, and the thickness of the strip made of a foamed or non-foamed body is 2 mm or more in diameter, and the void portion is 10% by volume of the aggregate. To 70% by volume. Hereinafter, embodiments of the present invention will be described. Example The base having the structure shown in FIG. 3 was used. The structure of the base is described in detail below. The size of the portion of the resin discharge plate 5 of the base that comes into contact with the molten resin has a long side of 150 m.
m, a rectangular plate having a short side of 50 mm and a thickness of 20 mm and having a number of small holes 4 formed therein. The distribution of these small holes 4 is of the type shown in FIG. In FIG. 3, the small hole 4 in the outer peripheral portion has an inner diameter of 1 mm, and the distance between the inner diameter centers of the small holes 4 is 3 mm.
And a total of 102 holes are drilled. The inside diameter of the small holes 4 inside is 2 mm, the distance between the centers of the inside diameters of the small holes is 10 mm, and 32 holes are arranged in a staggered manner. Fig. 4
Were extruded and molded into a large number of resin strips 2 by an apparatus as shown in FIG. Polystyrene 100w as resin
2.0 wt% of talc is blended with the t%, and the blend is supplied to the extruder 6 (supply section is not shown). In the extruder 6, 3.0 wt% of butane as a foaming agent is added to the blend. Was mixed and pressed. The temperature of the extruder 6 was set to 170 ° C. in the resin supply section and 220 ° C. in the melting section, and extruded as a resin strip 2 from a die maintained at 130 to 150 ° C. There is a large difference in the discharge speed between the resin strip 2 protruding from the small hole 4 at the outer peripheral portion and the resin strip 2 protruding from the small hole 4 inside. That is, since the inside has a larger diameter, it is discharged earlier. The take-up speed is almost the same as the discharge speed of the strip 2 extruded from the small hole 4 in the outer peripheral portion, or
If it is made a little slower, the inner resin strip having a large inner diameter is remarkably slid while expanding in volume due to foaming, and advances while fusing with the resin strip adjacent at the slid portion, as shown in FIG. To form an aggregate. The obtained aggregate was a resin strip aggregate having an outer dimension of about 130 mm in width and a thickness of about 30 mm, an apparent density of 40 kg / m ³ (about 25 times), and a void of about 25% as a whole. .

[0006]

[Effect of the Invention] The thermoplastic resin thin-strip bent assembly of the present invention has a good longitudinal shape because the inside of the strip has an irregular shaped gap formed in the length direction and does not penetrate at the outer periphery. Water can be drained in any direction. In addition, in the sliding assembly of the present invention, the outer peripheral portions are fused to each other in the length direction of the strip to be continuous, so that the bending strength is increased. Therefore, it can be used as a lightweight building structural material.

[Brief description of the drawings]

FIG. 1 is a perspective view of an assembly of the present invention.

FIG. 2 is a perspective view showing a state of a cut surface in FIG. 1;

FIG. 3 is a front view of a molding die.

FIG. 4 is a schematic explanatory view of an apparatus for manufacturing a resin strip aggregate used in the present invention.

[Explanation of symbols]

 2 strips 3 voids

Claims (1)

(57) [Scope of request for utility model registration] 1. A molded article in which a number of strips made of a thermoplastic resin are integrally formed. Inside the strips, the strips are slid in a wave shape in the length direction, and each strip is partially formed. It is characterized by being fused by contact fusing, forming irregular voids in the length direction between the strips, and the outer periphery is substantially closed by the strips being fused to each other in the length direction. Thermoplastic resin strip assembly.