How to deal with the adhesive mold of TPE soft glue secondary injection?

In the process of secondary injection molding, TPE soft adhesive mold is difficult to demould. It is not uncommon for strong demoulding to cause soft rubber deformation. As a result, more waste and inferior products are produced and processed, and the processing cycle is long. From the perspective of TPE material supplier, how to cooperate with customers to improve the processing of sticky mold? In fact, there may be many ways to improve the TPE viscosity of the soft glue when it is encapsulated.

Processing Method 1: Considering the Die Factor

TPE soft adhesive mold, with the mold is also related.

The smoother the surface of a mould is, the easier the TPE soft glue will stick to the mould. To this end, try to make a smooth surface of the male mold, the female mold to do sandblasting or sunburn treatment.

B. Drawing angle. The drawing angle of the male die is as small as possible or not, so that the soft glue tends to stick to the male die, so that it is not difficult to remove it from the female die.

C. Design of die exhaust structure. It should be conducive to exhaust, reduce the gas pressure in the die chamber, and be conducive to the release of soft rubber.

Processing Method 2: Adjusting Forming Process

A. Low temperature for male die and high temperature for female die.

B. Appropriate reduction of forming temperature;

C. Decrease the holding pressure properly.

Method 3: Material optimization

By adjusting the mixing system of materials, the problem of poor demoulding of materials can be greatly improved.

Method 4: Use release agent.

This is the most common approach. After each injection moulding several products, spraying some release agent on the moulds is OK. But this treatment is also a necessary method, and there are the following shortcomings:

A. Spraying demoulding agent from time to time to reduce production efficiency;

B. Many release agents are chemical substances, which have certain toxicity. For some products with higher requirements, they are not conducive to environmental protection and safety.

C. Removal agent may cause white spots on the surface of products and affect the appearance quality of products.