JPS6197457A - Production of three-dimensional reticulated aggregate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for producing a three-dimensional reticular aggregate made of synthetic resin that is widely used for building materials, filtering materials, cushioning materials, packaging materials, etc.

(Prior art) As a method for producing a three-dimensional reticular aggregate made of synthetic resin, a molten synthetic resin filament is spun out from a downward nozzle, and while the filament is still in a molten state, the required amount is applied to the nozzle side or to the cooling solidification side. There is a method in which each filament is made to slide and weld together by applying vibration (Japanese Patent Publication No. 51-24012), and a method in which the descending molten filament is pulled up at a slower rate than its descending speed to form a coiled shape. , method of manufacturing by welding (Tokukō 5)
1-16530), a method that combines these methods (Japanese Patent Publication No. 54-26627), and a method in which descending molten filaments are passed through turbulent air and then bent and welded (Japanese Patent Publication No. 1987-26627). No. 3942) etc. have already been proposed by the inventor of the present application.

(Problems to be Solved by the Invention) In the conventional method described above, the descending speed of the molten filament is slower than that of the filament (sliding that occurs in the method of manufacturing by taking it up and sliding it into a coil shape). There is a limit to the amplitude of the curvature, making it unsuitable for forming three-dimensional network aggregates with large porosity and low density, and making it difficult to manufacture three-dimensional network aggregates with various densities. The method of manufacturing by applying vibration to the cooling and solidifying side using the required method requires a complicated vibration generator, and the method of making it slide through turbulent air also requires a turbulence generator, which can cause major damage to the equipment. There is a drawback.

One object of the present invention is to present a method that can easily manufacture even a three-dimensional mesh aggregate with large voids using a simpler device without using complicated devices such as vibration generators or turbulence generators, and Another purpose of the present invention is to effectively solve the problem of uneven outer surfaces of raw potatoes in the manufacturing process of three-dimensional reticular aggregates.

Means for Solving Problem C) The present invention spins thermoplastic synthetic resin filaments from a required number of downward nozzles and allows them to naturally descend, and also provides rotatable and reciprocatable air jets installed in the gaps between the nozzles. Injecting air imparted with a required temperature and ejection speed from a nozzle intermittently or continuously onto the filaments that are still in a molten state during the descending process to intersect and weld the filaments, In addition, the outer circumferential surface of each of these filaments is shielded by a water flow, and then these filaments are taken up at a slower rate than the above-mentioned descending speed and rapidly cooled and solidified, resulting in a large porosity and a uniform outer circumferential surface. This enables the production of three-dimensional reticular aggregates.

(Function) In the present invention, while the molten resin filament is being lowered from the downward nozzle, the air jetting nozzle installed in the gap between the downward nozzles is rotated or reciprocated, and air at a required temperature is intermittently supplied at a required jetting speed. Alternatively, each filament is intersected and welded by continuous spraying, and a curtain of water flow is formed around the outer periphery of the bundle of filaments to prevent each filament from protruding outside a certain range by spraying. It is something.

(Example) The figure shows a manufacturing process diagram of an example of the present invention. This will be explained below. Thermoplastic synthetic resin filaments (2) are spun out from a large number of downward nozzles (11) of an extruder die. While naturally descending, air (4) is intermittently supplied with the required temperature and jetting speed from the rotatable and reciprocating air jetting nozzles (3) installed in the required number in the gap between the downward direction and the nozzle (1). Alternatively, by continuously controlling the injection to the filaments (2) which are still in a molten state in the descending state, the filaments (2) intersect with each other in a nearly spiral shape;
Welded together, a water tank (5) with a slit in the lower surface is installed on the outer periphery of the downward nozzle (1) and the air jet nozzle (3).
) from the water flow (6) along the guide wall (7) in a line (2)
゛These filaments (2
) is then taken up by the take-up roll (81 (81') at a slower rate than the above-mentioned descending speed to make its sliding more complicated, and is introduced into the cooling water (9) where it is rapidly cooled and solidified to form a three-dimensional network assembly. body (II).

C) Effect of the invention) The present invention is configured as described above, and can produce a three-dimensional network aggregate of a desired density by adjusting the air jetted from the air jetting nozzle without using a vibration device or a turbulence device consisting of a complicated mechanism. It can be easily manufactured. In particular, when the temperature of the air is low and the ejection speed is low, the filaments have a large diameter and form a dense network. However, if you increase the air temperature and increase the ejection speed, the wire diameter becomes thinner and the air gap becomes smaller. Even a three-dimensional network aggregate with a high ratio can be easily manufactured. Furthermore, when air is injected onto the filament, the sliding becomes excessive and protrudes outside a certain range, resulting in an uneven outer surface. This is also prevented by the curtain created by the water flow on the outer periphery, making it possible to provide a product with a uniform outer surface shape. It also becomes.

[Brief explanation of the drawing]

The figure is a manufacturing process diagram showing an example of the present invention. (1)...Downward nozzle, (2)...String, (3)
... Air jet nozzle, (4) ... Air % (5)
...Water 4'! , (6)...Water flow, T7)-9, Guide wall, (81(81'...Take-up roll, (9)...
- Cooling water, (II... three-dimensional network aggregate.

Claims (1)

[Claims] Thermoplastic synthetic resin filaments are spun out from the required number of downward nozzles and allowed to fall naturally, and the required temperature and jet speed are imparted to them by rotatable and reciprocating air jet nozzles installed in the gaps between the nozzles. Air is intermittently or continuously injected onto the filaments that are still in a molten state during the above-mentioned descending process to intersect and weld the filaments, and the outer circumferential surface of each of these filaments is shielded by the water flow. A method for producing a three-dimensional reticular aggregate, characterized by: