JPH01314771A - Three-dimensional net material - Google Patents

Abstract

PURPOSE:To obtain a three-dimensional net material useful as foundation material for building materials, etc., having excellent soundproofing properties and improved compression resistance, comprising linear zones having densely existing monofilaments and linear zones having coarsely existing monofilaments. CONSTITUTION:For example, monofilaments 11 comprising a thermoplastic resin having 0.2-2mm diameter and having peak parts 13 and dale parts 14 are provided with linear zones 15 having densely existing filaments with 260-3,500g/m<2> apparent density and linear zones 16 having coarsely existing filaments with 200-700g/m<2> apparent density in the density ratio of 1.3:1-5.0:1 and 5-30% based on the total zones of the zones 15 having the densely existing filaments are set in 100-1,000mm pitch to give the aimed three-dimensional net material.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is used to inlay base materials for building materials, cushion materials, filter mats, breeding mats for plants and seafood, reinforcing materials for civil engineering works, and greening protection of slopes. This invention relates to a three-dimensional mesh body used for mats, etc.

(Prior art) A three-dimensional network in which a large number of continuous monofilaments made of thermoplastic resin are bent three-dimensionally, intersect with each other in places, and are fused to each other at the intersecting positions to form a large number of peaks and valleys. Because it has irregular voids and is lightweight, it is used for various purposes (see Japanese Patent Publication No. 18662/1982 and Japanese Patent Publication No. 42978/1982).

However, such a conventional three-dimensional network has a strain rate of 20%.
The load is approximately 6000 kg/r4 at most, and the compression resistance may be insufficient depending on the application.

For example, when the above-mentioned conventional three-dimensional mesh body is used as a soundproof base material for a wooden floorboard, it is required to have high compression resistance to the extent that the floor surface does not become uneven due to the load of pedestrians or furniture. Therefore, it is conceivable to improve the compression resistance by using a three-dimensional network having a uniformly large apparent density as a whole. However, in this case, there is a problem that the soundproofing properties are reduced.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned problems, and its purpose is to provide a three-dimensional mesh body that maintains good soundproofing properties and has improved compression resistance. It is about providing.

(Means for Solving the Problems) As shown in FIG. 1, the three-dimensional network body of the present invention has a large number of continuous monofilaments 11 made of a thermoplastic resin bent three-dimensionally and extending to intersect in some places. In the three-dimensional network 10 in which a large number of peaks 13 and troughs 14 are formed by fusing each other at 12, a linear zone 15 in which the monofilaments 11 are densely present, and a linear zone 15 in which the monofilaments 11 are located between the zones 15 It has a linear band 16 in which the lines are roughly present.

In the present invention, polyamide, polypropylene, polyethylene, etc. are preferably used as the thermoplastic resin constituting the monofilaments 1 to 11. The monofilament 11 made of such thermoplastic resin has a diameter of 0.2 to 2.
mm is preferable.

In addition, a linear zone 15 in which filaments 11 are densely present
It is preferable that the apparent density of the linear zone 16 where the filaments 11 are loosely present is 200 to 700 g/ml. And the apparent density ratio between the former and the latter is
t,3:1 to 5.0:1 is preferred.

Further, the zones 15 and 16 are arranged alternately such that the linear zones 16 where the filaments 11 are loosely present are located between the linear zones 15 where the filaments 11 are densely present, and the filaments 11 are arranged sparsely. The linear zone 15 in which 11 is densely present has a pitch of 100 to 1000m+n, and the entire 5
It is preferable to provide it so that it occupies ~30%. Moreover, the apparent thickness of the three-dimensional network body 10 is preferably 5 to 50 mm.

Note that the apparent density of the boundary between the linear band 15 and the linear band 16 may change sharply, or may change gently. Further, the bands 15 and 16 only need to be present alternately, and when viewed as a whole, they may be configured in a diagonal striped pattern, a lattice striped pattern, a checkered pattern, or the like.

Next, a second example of the method for manufacturing the three-dimensional network body 10 of the present invention will be described.
This will be explained with reference to the figures.

First, a large number of continuous monofilaments 11 made of thermoplastic resin are melt-extruded downward from a large number of spinnerets of a mold 21 of an extruder 20. And the extruded monofilament 11
is dropped onto a conveyor 30 having a large number of protrusions 31 on its surface. Then, the monofilament 11 is bent vertically in a wave-like manner by the protrusion 31 .

When the conveyor 30 is moved around and vibrated in a direction perpendicular to this moving direction, the monofilament 11
The monofilament 11 is also bent in a wavy manner in the horizontal direction, and the monofilament 11 as a whole is bent irregularly in three dimensions. Then, the neighboring monofilaments 11 intersect in some places, and the intersecting positions 12
The monofilaments 11 are fused to each other, forming a large number of peaks 1.
3 and a valley portion 14 are formed.

The large number of spinnerets in the mold 21 of the extruder 20 are alternately provided with groups of spinnerets with narrower intervals and groups of spinnerets with wider intervals. The monofilament 11 extruded from the monofilament I.1
Linear zone 15 where 1 is densely present and monofilament 1
1 are formed alternately with linear bands 16 in which 1 is roughly present.

In this way, the three-dimensional network body 10 of the present invention is obtained. The thickness of the three-dimensional network 10 obtained is determined by the height of the protrusions 31 on the conical hair 30. Further, when the overall apparent density of the three-dimensional network body 10 is to be increased, it is preferable to provide the spinning holes of the mold 21 in two rows in the front and back.

In addition to the above-described manufacturing method, it is also possible to set the intervals between the numerous spinnerets of the mold 21 at the same interval and periodically change the moving speed of the conveyor 30, or to change the extrusion speed of the monofilament 11 from the spinnerets. By changing it periodically, it is also possible to alternately form linear zones 15 in which the monofilaments 11 are densely present and linear zones 16 in which the monofilaments 11 are sparsely present. in this case,
A linear zone 15 in which monofilaments 11 are densely present is formed in a direction perpendicular to the moving direction of the conveyor 30.

(Function) In the three-dimensional network of the present invention, the linear zone in which monofilaments are densely present has poor soundproofing properties, but excellent compression resistance. On the other hand, a linear band in which monofilaments are coarsely present has poor compression resistance but excellent soundproofing properties.

The linear bands where monofilaments are densely present support the linear bands where monofilaments are sparsely present between them, resulting in improved overall compression resistance and overall soundproofing. is well retained.

(Example) Examples and comparative examples of the present invention are shown below.

1 Piece - The three-dimensional network body 10 shown in FIG. 1 was obtained using the manufacturing apparatus shown in FIG. 2. In the obtained three-dimensional network 10, the monofilaments 11 have a relative viscosity (DIN 53727) of 2.6.
It is made of nylon 6 and its diameter is 0.7 to 1 mm.
Dea puko.

In addition, a linear zone 15 in which monofilaments are densely present
The pitch was 300 mm, the width was 50 mm, and the apparent density was 700 g/rrf. On the other hand, the linear zone 16 in which the monofilaments 11 are roughly present has a pitch of 300 mm, a width of 250 mm, and an apparent density of 350 g/n.
Its apparent thickness is 10 mm, and its average apparent density is 410 mm.
g/n(was.

This three-dimensional network body 10 was attached to a 9 mm thick wooden plywood board with adhesive, and the compressive strength at 20% compression was measured according to JIS K 7220, and the value was 20,000 kg/
rrf was good. In addition, when the impact sound level was measured according to JIS A 141B, the level was L-
50 was good.

The apparent density of the Beikian flaming three-dimensional network is uniformly 485 g/
The same procedure as in the example was carried out except that rW was used. Its soundproofing grade was good at L-50, but its compressive strength was 60.
It was found to be defective at 00kg/rrf.

The apparent density of the three-dimensional network is uniformly 620g/
The same procedure as in the example was carried out except that the compressive strength was 23000 kg/rd, which was good, but the soundproofing grade was L-55, which was insufficient (effects of the invention). Since the three-dimensional network of the present invention has linear zones in which monofilaments are densely present and linear zones in which monofilaments are sparsely present between the zones, soundproofing properties are maintained well as a whole, Moreover, compression resistance is improved.

Therefore, the three-dimensional network of the present invention can be suitably used as a base material for building materials, and can also be used in many fields.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the three-dimensional network body of the present invention, and FIG.
The figure is a perspective view showing an example of the method for manufacturing a three-dimensional network body of the present invention. 10- three-dimensional network, 11- monofilament, 12-
Intersection position, 13-crest, 14-trough, 15-linear zone where monofilaments are densely present, 16-linear zone where monofilaments are coarsely present.

Claims (1)

[Claims] 1. In a three-dimensional network in which a large number of continuous monofilaments made of thermoplastic resin are bent three-dimensionally and extend to intersect in places, and are fused to each other at the intersecting positions to form a large number of peaks and valleys, the monofilaments are A three-dimensional network body characterized by having linear zones that are densely present and linear zones that are located between the zones and where the monofilaments are sparsely present.