JPS6044125B2 - Method for manufacturing synthetic resin fasteners - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a zipper using vinyl chloride resin.

An object of the present invention is to prevent molded fasteners from being deformed or distorted, and to eliminate product loss.

Conventionally, fasteners made of vinyl chloride resin have been produced by continuously extruding fasteners with male and female claws using an extrusion molding machine, immersing them in a water tank to cool them, and then releasing the fasteners after leaving the water tank. It was manufactured by a process of air-cooling, draining, drying, polymerizing, and winding up a long length using a winding device.

As a result, since the shrinkage of the vinyl chloride resin is not completely stabilized and the resin is wound neatly, the shrinkage of the resin is stabilized in the wound state, and this shrinkage causes the lower layer of the winding layer to The more the zipper becomes, the stronger the tightening force becomes, causing deformation and distortion of the nail, and furthermore, the winding becomes curly, and when it is rewound, a curved part appears. In this case, the opening of the bag may be distorted by the zipper, and a reliable occlusal function may not be obtained, so such defective parts have to be cut out, resulting in higher product costs and longer lengths. If used, the loss in terms of cost would be proportionally large to some extent. The present invention provides a manufacturing method that eliminates the above-mentioned conventional problems, and the gist thereof is to reheat the fastener which has been air-cooled and drained after cooling in a water tank in the conventional manufacturing method using a heating device such as an infrared heater. The layers are again cooled in a water tank, cooled and drained in air, and then superposed, and then wound up using a winding device.

The details will be explained below based on the drawings.

1 is an extrusion molding machine, 2 is a die, and this extrusion molding machine 1
A fastener F having male and female interlocking claws is continuously extruded from the die 2.

This extruded fastener F is taken into a first water tank 3 and cooled with water, and the fastener F exiting the first water tank 3 is cooled and drained by air using a dropper 4. Next, the fastener F is introduced into a heating device 6 such as an infrared heater and reheated. The heating temperature in this heating device 6 is 80~
It is best to maintain any suitable temperature within the range of 90°C within ±1°C. Further, the fastener F that has left the heating device 6 is cooled again with water in the second water tank 7, the fastener F that has come out of the water tank 7 is air-cooled and drained by the dropper 8, and the fastener F that has left the water tank 7 is cooled and drained by the dropper 8, and then the fastener F that has left the water tank 7 is cooled and drained by the dropper 8, and then the fastener F that has left the water tank 7 is cooled and drained by the dropper 8. After completing the alignment, the winding device 10 winds up the length.

In the figure, reference numeral 5 indicates a guide roll for introducing the fastener F into the heating device 6, and reference numerals 11a and 11b indicate pressure rolls. As described above, in the present invention, the fastener F formed by the extrusion molding machine 1 solidifies its shape by cooling with water in the first water tank 3.

However, cooling with water in the first water tank 3 does not sufficiently shrink the internal constituent molecules of the fastener F, and the stress cannot be completely removed. Therefore, in the present invention, by heating the fastener F again with the heating device 6, the action of the molecules becomes active and the arrangement of the molecules returns to its natural state, and after cooling with water in the second water tank 7, the contraction becomes stable. solidified. In particular, in the case of heating with an infrared heater, the heating effect is applied from inside the fastener F, and the tension between the internal molecules, which is a factor of stress, rapidly disappears, and the secondary crystals become the original crystals. When cooled with water, it shrinks uniformly and solidifies stably with distortion removed. Therefore, according to the method of the present invention, the fastener that is wound up neatly by the winding device is wound up in a completely stable state of shrinkage, so that deformation and distortion due to shrinkage after winding is avoided. This prevents the problem of winding and curling, making it possible to obtain a zipper that is in good quality and in good condition over its entire length, eliminating the need for inspection of defective parts and cutting and discarding as required in the past, and the work of adhering to the bag opening etc. It has the special effect of increasing efficiency, eliminating waste, and being cost-effective.

[Brief explanation of the drawing]

The figure is a side view of a manufacturing apparatus showing an embodiment of the method of the present invention. 1...Extrusion molding machine, 2...Dice, 3
...First aquarium, 4...Dropper, 6...
...Heating device, 7...Second water tank, 8...
...Dropper, 9...Claw alignment device, 10
... Winding device.

Claims (1)

[Claims] 1. A step of continuously extruding a vinyl chloride resin fastener having male and female interlocking claws using an extrusion molding machine, cooling it by immersing it in a first water tank, and cooling the fastener after leaving the first water tank. A step of air-cooling and draining the zipper, a step of reheating the air-cooled and drained zipper by passing it through a heating device such as an infrared heater, and a step of cooling the zipper leaving this heating device again with water in a second water tank. Step 2 of air-cooling and draining the fasteners that have come out of the water tank, and aligning the air-cooled and drained fasteners with a hook-aligning device;
A method for manufacturing a synthetic resin fastener, which comprises the step of subsequently winding up a long length using a winding device.