Two shot mould how to solve TPE soft material sticky to the mold

In the process of two-color injection molding, the problem of TPE soft material sticking to the mold is indeed an aspect that needs to be focused on. In order to improve the situation of TPE soft material sticking to the mold, the following aspects can be tried:

1. The two shot mould design optimization:

Try to design the male mold to be smooth, and the female mold to be sandblasted or sun-textured to reduce the contact area between the TPE soft material and the mold surface, thereby reducing the adhesion.

Reduce the draft angle of the male mold or do not make a draft angle, so that the soft material is more likely to stay on the male mold rather than adhere to the female mold.

Optimize the exhaust structure design of the mold to ensure that the gas can be discharged smoothly, reduce the gas pressure in the mold cavity, and help the soft material demolding.

2. Two shot injection molding process adjustment:

During the two-color injection molding process, the temperature of the mold can be adjusted, such as low-temperature treatment of the male mold and high-temperature treatment of the female mold, using the temperature difference effect to reduce the adhesion of the soft material.

Appropriately reduce the molding temperature and holding pressure to reduce the fluidity and pressure of the TPE soft plastic and reduce the possibility of its adhesion to the mold.

3. Material selection and optimization:

Select suitable TPE materials, adjust the material formula system, improve its fluidity and demolding performance, and reduce the occurrence of mold sticking.

Try to use a demolding agent that is more compatible with TPE soft plastic to reduce its impact on the appearance of the product and ensure the demolding effect.

4. Mold maintenance and cleaning:

Ensure the cleanliness of the mold before injection molding to avoid impurities such as oil, dust, etc. that affect the contact between TPE soft plastic and the mold.

Maintain the mold regularly, check and clean the residues and impurities on the mold, and keep the mold surface smooth and clean.

5. Other precautions:

During the process of encapsulation secondary injection molding, pay attention to controlling the injection speed and pressure to avoid excessive injection speed and high pressure that cause excessive flow and adhesion of soft plastic.

When designing a two-color mold, consider the compatibility and fluidity of the two plastic materials to ensure smooth separation and demolding during the injection molding process.