JPS6325102B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) 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) A method for manufacturing a three-dimensional reticular aggregate made of synthetic resin is to spin synthetic resin molten filaments from a downward nozzle, and when the filaments are still in a molten state, apply the required method to the nozzle side or to the cooling solidification side. There is a method in which each filament is made to vibrate and folded and welded together (Special Publication No. 51-24012), and a method in which the descending molten filament is taken up at a slower rate than its descending speed to be folded and welded into a coil shape. Method of manufacturing
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 is unsuitable for forming three-dimensional network aggregates with high porosity and low density, and has the disadvantage 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. In addition, when the molten filament is folded during its descending process, there is a drawback that the fold tends to stretch due to the filament's own weight before it cools and solidifies, causing the filament to lose its shape. There is a strong tendency.

The present invention makes it possible to manufacture a three-dimensional net-like aggregate with a desired density using a simpler device without using complicated devices such as vibration generators or turbulence generators, and also reduces the weight of the filaments during their descent process. The object of the present invention is to provide a method for manufacturing a three-dimensional reticular aggregate that can effectively prevent the deformation of the folded structure caused by this.

(Means for Solving the Problems) The present invention spins thermoplastic synthetic resin filaments from a required number of downward nozzles and allows them to naturally descend, and a fluid that can freely rotate and reciprocate is installed in the gaps between the nozzles. Water, hot water, adhesive, air, or other necessary fluids given the required temperature and jet speed from the jet nozzle are intermittently or It is characterized by continuously ejecting these filaments to intersect and weld them together, making it possible to easily produce a three-dimensional network aggregate with a desired density, and also to This effectively prevents the folded structure from deforming due to its own weight.

(Function) In the present invention, the required fluid is injected from the fluid injection nozzle to the filaments that are spun from the downward nozzle and naturally descend to make them fold, intertwine and weld the filaments, and at the same time, the filaments are semi-cooled and bonded by the fluid. It is then lowered and finally completely solidified with cooling water. This prevents the filaments, which have once been folded during the descent process, from stretching and losing their shape due to their own weight until they are cooled and solidified. 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 1 of an extruder die and allowed to naturally descend. Fluid 4 such as water, hot water, adhesive liquid, air, etc., which has been given a desired temperature and a required ejection speed, is sent through the required number of rotating and reciprocating fluid injection nozzles 3 installed in the gap between the downward nozzles 1 during the above-mentioned descending process. intermittently or continuously injecting the filaments 2 which are still in a molten state so that the filaments 2 are intertwined and welded together in a nearly spiral shape, and at the same time are partially cooled or bonded by the fluid 4, Thereafter, these filaments 2 are taken up by take-up rolls 5, 5' at a speed lower than the rate of descent thereof, and introduced into cooling water 6 where they are rapidly cooled and solidified, thereby obtaining a three-dimensional network aggregate 7.

(Effects of the Invention) The present invention is constructed as described above, and the filaments are primarily folded, intertwined, and welded by jetting a fluid, but the temperature and jetting speed of the fluid can be adjusted freely, and the jetting can also be done at will. Since the fluid injection nozzle can be changed intermittently or continuously, and the fluid injection nozzle can also be rotated or reciprocated, it is possible to easily manufacture a three-dimensional network assembly having a desired density by appropriately controlling these elements. However, as the filaments intertwine and weld, they are partially cooled or bonded by this fluid, which has the effect of preventing the folded structure from being stretched and deformed by the weight of the filaments during the subsequent descending process. .

[Brief explanation of drawings]

The figure is a manufacturing process diagram of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Downward nozzle, 2... Line, 3... Fluid injection nozzle, 4... Fluid, 5, 5'... Take-up roll, 6... Cooling water, 7... 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 jet speed are applied to them by the required number of rotatable and reciprocatable fluid jet nozzles installed in the gaps between the nozzles. Water, hot water, adhesive liquid, air, and other necessary fluids are intermittently or continuously injected onto the filaments that are still in a molten state during the descending process to intersect each of these filaments. A method for producing a three-dimensional network aggregate, characterized by welding.