JPS5954004B2 - Method and device for producing resin pellets using intermittent pressure fluid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a compensating material, such as a thermoplastic resin granule,
That is, the present invention relates to a method and apparatus for producing sugar beet pellets using intermittent pressure fluid to produce pellets.

A typical conventional method for producing sugar beet pellets is the hot cut method.

This pelletizer cuts the resin extruded from a die installed at the tip of an extruder into pellets of a predetermined size using a rotary blade of a rotary cutter installed on the front surface of the die in contact with it, or Instead of the rotating blade, a nozzle that injects fluid is rotated and cut into pellets of a predetermined size.

However, in these devices, the still viscous pellets that have been extruded from the die and cooled stick to the rotating blade or rotating shaft, so it is troublesome to take measures to prevent this sticking.

In addition, a rotating cutter is installed on the front of the die, so
It becomes very difficult to inspect and clean the die, which is dangerous.

Furthermore, there were many drawbacks such as restrictions on the position and number of extrusion holes in the die.

These shortcomings are due to the fact that the concept of cutting extruded resin with a rotary cutter has not evolved at all.

Therefore, in order to eliminate these drawbacks, the present invention does not adopt a method of cutting by rotation of a rotary cutter, but instead performs cutting by intermittent pressure fluid jetted from a fixed direction. This eliminates the need for any equipment such as a rotary cutter on the front, and makes it possible to easily hot-cut all kinds of resins and other similar materials, and to increase productivity.

This will be explained based on what is shown in the drawings.

In the drawings, reference numeral 1 denotes a pelletizing die, which is attached to the tip of a thermoplastic resin extruder.

2 is a resin extrusion hole drilled in the die 1, and 4 is an intermittent pressure converter for pressure fluid.

In other words, this intermittent pressure conversion device converts pressure fluid supplied at a constant pressure from a pressure fluid supply source into an intermittent pressure fluid by alternating between pressurized and unpressurized states and sends out the converted pressure fluid. It is.

Reference numeral 5 denotes a pressure guiding hole bored inside the die 1, and the above-mentioned intermittent positive conversion device 4 is connected to the pressure guiding hole 5 either directly or through a conduit 7.

Reference numeral 6 denotes an injection hole of the pressure guiding hole 5. The injection hole 6 is opened at the side surface of the extrusion port of the resin extrusion hole 2, and the injection hole 6 is oriented diagonally outward.

3 indicates a pellet. Note that the pressure-guiding holes 5 and the injection holes 6 may not be formed in the die 1 itself, but a lid-like body with the pressure-guiding holes 5 and the injection holes 6 formed inside may be attached to the outer surface of the die 1. No problem.

Molten resin material is extruded from the die 1 through the resin extrusion hole 2, and intermittent pressure fluid is injected from the injection hole 6 to cool and cut the extruded molten resin during extrusion through the extrusion hole 2. At the same time, this is blown away toward the outer periphery of the die.

In this case, when the pressure fluid detected by the intermittent pressure change detection device 4 is unpressurized, the molten resin is extruded from the extrusion hole 2 of the die 1, and when the pressure fluid is pressurized and injected, the extruded molten resin is cut, so that the intermittent positive conversion is performed. By adjusting the time of no pressure of the pressurized fluid by the device 4, pellets 3 of a desired constant size can be obtained.

The pressurized fluid may be a gas or a liquid, or may be heated or cooled, and may be appropriately pressurized, and may be appropriately pressurized to suit the properties of the material to be pelletized, such as various resins. This is done under certain conditions.

The present invention is completely different from the conventional cutting method of molten resin using a rotary cutter, and the present invention simultaneously cuts, cools, and blows off the molten resin by using a pressurized fluid that is intermittently injected at the extrusion port of the molten resin extrusion hole. Because it is something to do,
There is no need to provide a rotary cutter device in front of the die as in the prior art, and there is therefore no fear that pellets will stick to the rotary blade or the rotary shaft.

Since there is no equipment to be attached to the front of the die, the position of the extrusion holes to be drilled in the die can be freely selected, and the number of extrusion holes can be increased, increasing productivity. Inspection and cleaning are easy and safe, post-processing of cut pellets is also easy, and it is possible to easily beretize all kinds of resin materials.

[Brief explanation of drawings]

The drawing is a longitudinal side view of the device. DESCRIPTION OF SYMBOLS 1...Die, 2...Extrusion hole, 5...Pressure guiding hole for intermittent pressure fluid, 6...Injection hole.

Claims (1)

[Claims] 1. Molten resin is extruded through an extrusion hole of a pelletizing die, and a pressure fluid is intermittently injected from a pressure guiding hole provided inside the die from the surface of the die to the extrusion port of the extrusion hole. A method for producing resin pellets using intermittent pressurized fluid, characterized in that the extruded molten phase trap is cut and blown away to the outside of a die using the same pressurized fluid. 2. An intermittent pressure fluid outlet hole is provided inside the surface of the beretizing die in which the resin extrusion hole is drilled, and has an injection hole that opens on the side surface of the extrusion port of the extrusion hole, and a pressure fluid outlet hole is provided at the other end of the pressure guide hole. Resin pellet production equipment using intermittent pressure fluid equipped with an intermittent pressure converter.