Plastic injection molding machine in the shutdown of the Notes Introduction

Suspended if the injection molding machine, it will be many times more than clear plastic spray or injection molding machine for plastic clean shot through the cylinder or barrel material remaining plastic. Case of plastic fade, will increase the number of clear spray. For minor repairs; shot material tank heater should be adjusted to the minimum value, such as 150 ℃, in order to minimize the possibility of thermal decomposition.http://www.prmindustry.com/
Abstract...Articles section Thermal stability of plastic injection molding (such as PS or PE) before, such as pre-shut down one night, simply close the hopper on the bottom of the slide and shoot material cylinder heater (heater only on the nozzle), spraying the clear cylinder in injection clean. After completely cleaning the nozzle, the barrel as a high degree of cooling, injection molding machine to be cooled, turn off all equipment. Injection molding machine can be fully ready for re-heating.If the material cylinder or barrel shot high temperature, only slight changes to the above steps to prevent the resin thermal decomposition. For example, in injection tank heater off (only on the nozzle of the heater), or the barrel as a high degree of cooling, spray continuously clear during the remaining resin. Off the bottom of the slide hopper, try spraying clear the barrel ramp rubber, if more non-plastic spray, you can turn off equipment to prepare for the next reuse.If the plastic injection molding machine in the decomposition or burning, will eventually change color, to make finished products into a scrap. In such a case would have to completely close the injection molding machine, spray clean and clear. Prevention method is to use a higher thermal stability of spray clear plastic case of heat-sensitive resin, so that can withstand the subsequent reheating.Some plastics (such as POM, PVC) is very easy to break down, if the injection on the way down suddenly, then continues to injection, you should open the nozzle heaters, nozzle only when the plastic has melted, the material can start shooting tank heater. Shoot material cylinder or barrel temperature should be raised to about 140 ℃. Then the temperature raised to processing temperature, and the remaining clear plastic spray as soon as possible. After spraying the plastic to be placed in clear cold water. To change the other plastics, the best choice of PS or PE, natural, non-fire-grade clear as the spray agent; if not completely clear leftover spray materials, then hurried to POM mixed cut PVC, or have mixed.Stop or switch to another plastic, you must check clearly the steps taken are correct. Material supplier has published a booklet containing full information before the operation should be carefully read, understand each plastic to be "standard shutdown procedure." Brochures should be placed in the injection molding machine side, in order to gain access to the operator at any time.

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             Peter  Huang