JPS6261704B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing a three-dimensional reticular aggregate made of synthetic resin that is widely used for building materials, filtration materials, cushion 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 manufacturing method in which the filaments are folded and welded together by applying vibrations (Special Publication No. 51-24012), and a method in which the descending molten filaments are taken up at a slower rate than their descending speed to be folded and welded into a coil shape. Method of manufacturing at least
16530), a method that combines these methods (Special Publication No. 54-26627), and a method in which descending molten filaments are passed through turbulent air, folded and welded (Special Publication No. 3942-1987). etc. have already been proposed by the inventor of the present application.

(Problems to be Solved by the Invention) Among the conventional methods described above, there is a limit to the amplitude of the folding that occurs in the method of manufacturing by taking the descending molten filament slower than its descending speed and folding it into a coil shape. It has the disadvantage that it is unsuitable for forming a three-dimensional network aggregate with a large porosity and a low density, and that it is difficult to produce three-dimensional network aggregates with various densities. In addition, the method of manufacturing by applying vibration to the nozzle side or the cooling solidification side using the required method requires a complicated vibration generator, and the method of passing through a turbulent air flow and causing it to fold also requires a turbulence generator. The disadvantage is that the equipment is bulky.

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 object of the present invention is to effectively solve the problem of irregularities in the outer surface that tend to occur in the manufacturing process of three-dimensional reticular aggregates.

(Means for solving the problem) The present invention spins thermoplastic synthetic resin filaments from a required number of downward nozzles and allows them to naturally descend, and a required number of rotatable and reciprocatable air jets are installed in 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, It is characterized in that the outer peripheral 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 are rapidly cooled and solidified, so that the porosity is large and the outer peripheral surface is uniform. This enables the production of three-dimensional reticulated 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. The filaments are intertwined and welded together by spraying at a target or continuously, 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. It is something to do.

(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 number of downward nozzles 1 of an extruder die and naturally descended. At the same time, air 4 imparted with a required temperature and a required ejection speed is controlled intermittently or continuously from the rotatable and reciprocating air ejection nozzles 3 installed in a required number in the gap between the downward nozzles 1 to achieve the above-mentioned descending state. Each filament 2 is sprayed onto the filament 2 which is still in a molten state.
are intertwined and welded to each other in a nearly spiral shape, and a stream of water 6 is passed along the guide wall 7 from a water tank 5 having a slit on the lower surface at the outer periphery of the downward nozzle 1 and the air jet nozzle 3. These filaments 2 are then dropped onto a take-up roll 8,
The three-dimensional net-like aggregate 10 is obtained by drawing the fibers at a lower speed than the above-mentioned descending speed by 8' to make the folds more complicated, and by introducing them into the cooling water 9 where they are rapidly cooled and solidified.

(Effects of the Invention) The present invention is configured as described above, and can produce a three-dimensional network assembly with 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. The body can be easily manufactured. In particular, when the air temperature is low and the ejection speed is low, the filaments form a thick network with a large diameter and a high density. However, if you increase the air temperature and increase the ejection speed, the wire diameter becomes thinner and Even a three-dimensional network aggregate with a large porosity can be easily produced. In addition, when air is injected into the filament, the folds become excessive and protrude 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, providing a product with a uniform outer surface shape. It will also be possible.

[Brief explanation of the drawing]

The figure is a manufacturing process diagram showing an example of the present invention. 1... Downward nozzle, 2... Line, 3... Air jet nozzle, 4... Air, 5... Water tank, 6...
... Water flow, 7 ... Guide wall, 8, 8' ... Take-up roll, 9 ... Cooling water, 10 ... Three-dimensional network aggregate.

Claims (1)

[Claims] 1 Thermoplastic synthetic resin filaments are spun out from the required number of downward nozzles and allowed to fall naturally, and the required temperature and jetting speed are applied to them by the required number of rotatable and reciprocatable air jetting 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 descending process to intersect and weld the filaments, and the outer circumferential surface of each of these filaments is shielded by a water flow. A method for producing a three-dimensional reticular aggregate, characterized by: