JPS5941059Y2 - Synthetic resin cooling and solidification equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for cooling and solidifying synthetic resins, particularly synthetic resins for powder coatings.

In recent years, powder coatings have shown remarkable growth as energy-saving and non-polluting coatings, and synthetic resins such as thermosetting polyester resins, acrylic resins, and epoxy resins are being provided and used in large quantities as materials for powder coatings.

These synthetic resins for powder coatings usually have a molecular weight of 60 to 12
It is desirable that the material has a softening point of 0° C. and can be easily pulverized by mechanical means at room temperature.

These synthetic resins are often coalesced at a relatively high temperature of 120° C. or higher, and the molten resin is cooled and solidified, then roughly pulverized, packaged, and shipped.

Conventionally, to cool and solidify molten resin, a method has been used in which the molten resin is poured into a shallow metal container and left to cool. A cooling solidification device from 5ANDVIK consisting of a cooling belt is also used.

5ANDVIK's cooling and solidifying equipment can be operated continuously and can be operated almost unattended in a steady state. If there is a slight fluctuation in the amount, it has the disadvantage that it gets wrapped around the press roller, often forcing the cooling and solidifying operation to be interrupted.

The inventors of the present invention have worked diligently to eliminate the above-mentioned drawbacks and to enable continuous and stable cooling and solidification work over a long period of time, despite fluctuations in resin temperature or dispensed amount. We developed this device.

In other words, this is a very simple device that sprays gas by installing a gas spray nozzle in the front of the press roller (on the opposite side of the press roller from the dispensing nozzle) or the front button, and in the rear. When cooling and solidifying resin that has high adhesion to the resin, there is no need to interrupt work due to the resin winding up around the spray roller due to fluctuations in resin temperature or payout amount, allowing stable continuous unattended operation of the cooling and solidification equipment. It is intended for this purpose.

The gas spray nozzle that can be used in the present invention may be either a slit-shaped nozzle or a hole-shaped nozzle provided at an interval of at least 50 mm, and one direction of gas spraying is 90 degrees to the cooling belt (perpendicular to the cooling belt). The cooling belt is set so that the pressure is between 1800 (spraying gas to the press roller in a horizontal direction with respect to the cooling belt), and the cooling belt Fixed gas piping on the supply side using a mechanism that can be changed arbitrarily within the range of 90° to 180°, for example, a rotary joint, a flexible tube, or a flange with at least 12 holes. It is preferable to have a mechanism for connecting the gas body and the gas spray nozzle.

Next, an embodiment of the present invention will be explained according to the drawings, and a table containing the results will be shown as Table 2 of the embodiment, and a conventional method will be shown as a reference example, and the effects of the present invention will be concretely explained by comparison. Explain in detail.

5AND as shown in Figures 1 and 2 with the specifications shown in Example Table 1
Around the press roller 30 of the VIK cooling and solidification device,
Gas spray nozzles 4, 4 each having nozzles of 1.5rIvnφ at 30wn intervals were set on a stainless steel pipe with an inner diameter of 15mmφ and a length of 1500m, and the original pressure was 3*'lf.
Kglcr! While spraying oil-free dry air from spray nozzle 4 in one direction as shown by the dotted line 6, a polyester resin having a melt viscosity of 800 poise at 200°C was discharged at 400 kg/hr from payout nozzle 1. The material was discharged as shown by the dotted line 1 in FIGS. 1 and 2, and cooled and solidified by passing it between the cooling belt 2 and the press roller 3, which rotate in the direction of the solid arrow in FIG. 1, as shown in the specifications of Table 1.

Note that 5 indicates air pulp.

The results are shown in Table 2. Note that the one direction of air spray (air spray nozzle angle) shown in Figure 16 shows a state where an angle of 1500 is maintained with respect to the cooling belt, but this angle is preferably in the range of 1000 to 1600. .

The effect of the present application cannot be achieved by using the middle rear nozzle alone, and the effect can only be achieved by using it in combination with the front nozzle. It is something to do.

When the above-mentioned air spray direction angle is 1800 degrees or more, the spray gas body or air hardly comes into contact with the synthetic resin, and when it is 90 degrees or less, especially in the front direction, it can press the synthetic resin in addition to cooling. In both cases, it is difficult to achieve the effects of the present invention because the force to separate it from the roller does not work.

A reference example for comparison is shown below.

Reference Example When the resin was discharged and cooled and solidified in the same manner as in the above example without using the air spray nozzles 4, 4', the number of times the resin was wrapped around the press roller was 9 times, making it impossible to perform stable continuous discharge operation.

As mentioned above, as is clear from the comparison between the example and the reference example, the present invention has a gas spray nozzle facing the cooling solidification device, which allows the resin to adhere to metals with relatively high adhesion, such as polyester resin. In dispensing and cooling and solidifying the synthetic resin, it has excellent effects in that it completely prevents the synthetic resin from wrapping around the press roller and enables stable continuous dispensing operation.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of the synthetic resin cooling and solidification apparatus of the present invention, and FIG. 2 is a plan view thereof. In FIGS. 1 and 2, 1 is a synthetic resin dispensing nozzle, 2 is a cooling belt, 8 is a press roller, 4 is a gas spray nozzle, 5 is an air valve, and 6 is an arrow indicating the direction of air spray. indicates the state of the synthetic resin being dispensed.

Claims (1)

[Scope of utility model registration request] A synthetic resin cooling and solidifying device consisting of an endless cooling belt and a press roller, with gas spray nozzles installed in front of the press roller or in front and behind the press roller.