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Blow Molding Machine Die Sticking Material: Causes and Solutions
15 Apr 2021

Today, let's talk about the cause and solution of the sticky material in the die of the blow molding machine.

After the plastic material enters the extruder barrel from the hopper, it will be forced to the direction of the machine head by the screw along with the rotation of the screw. Due to the resistance of the filter screen, the splitter plate, and the die of the machine head, and the gradual reduction of the volume between the screw threads, the advancing material is greatly resisted, and at the same time, it is heated by the heat introduced by the barrel; on the other hand, When plastic is subjected to compression, shearing, stirring and other forces in motion, the friction between the barrel and screw and the friction between plastic molecules will generate a lot of heat.

The temperature of the plastic in the barrel continues to increase, and its physical state gradually changes from a glass state to a highly elastic state, and finally becomes a viscous fluid state, and is further completely plasticized. Due to the continuous rotation of the screw, the plasticized plastic is extruded from the die of the machine head with equal pressure and an equal amount to form a plastic product with a certain shape. After cooling and shaping, the extrusion molding work is completed.

It is very troublesome for the plastic blow molding machine to produce sticky materials in the die of the blow molding machine during the production process. These sticky materials will inadvertently appear in the joint neck and inside the die so that our products are also Dark spots, black spots, and black lines may be attached occasionally. So, how did this cause come about? How can we effectively avoid these phenomena?

First of all, let's talk about the phenomenon of sticky material at the die mouth of the blow molding machine. The temperature response is too high, or the temperature control instrument fails, causing the plastic to be over-heated and sticky; the plastic outlet of the machine head has large smoke, strong irritating smell, and crackling noise; granular scorch appears on the plastic surface; There are continuous pores at the joint of the glue.

The second is the reason for the sticky material in the die of the blow molding machine. Excessive temperature control will cause plastic sticking; if the screw is used for a long time without cleaning, the scorched material will accumulate and extrude with the plastic; the heating time is too long, and the plastic accumulated material will be heated for a long time, which will cause the plastic to deteriorate and scorch; parking time is too long Long, there is no cleaning of the machine head and screw, causing the plastic to decompose and burn; multiple mold changes or color changes cause the plastic to decompose and burn; the machine head gland is not pressed tightly, and the plastic is aging and decomposed inside; the temperature control instrument fails, causing Sticky material after ultra-high temperature.

The third method is to eliminate the sticky material in the die of the blow molding machine. Frequently check whether the heating system is normal; clean the screw or machine head regularly, and thoroughly clean it; heating according to the requirements of the process, the heating time should not be too long, if there is a problem with the heating system, you should find the relevant personnel to solve it in time; change; The mold or color change should be timely and clean to prevent variegated color or scorching of the glue; after adjusting the mold, the mold cover should be pressed tightly to prevent the glue from entering; once the sticky material is found, the head and screw should be cleaned immediately.

The above content is the reason and solution for the sticking of the die of the blow molding machine.