In the production process of natural rubber products, the demolding of silicone products during molding is a crucial step. Whether it's a minor or major issue, everyone will encounter difficulties in demolding during molding. If the problem of difficult demolding is severe, it will significantly impact the production efficiency of silicone products. So, how to solve the problem of difficult demolding? Below are several solutions for the difficult demolding of silicone molds for reference.

Surface Treatment for Molds

Silicone product moldings undergo a washing process before being placed on the hydraulic molding machine, especially for newly installed molds that have just been powered off, a sandblasting treatment must be performed first.

Different wash mold sands are chosen for male and female molds.

The mold freshly sandblasted must be heated to an adequate temperature before removing material for shaping, and a release agent must be applied prior to shaping.

Note that electroplating molds must never be sandblasted, including resin sandblasting.

2. Spray Desmolding Treatment

During the molding process of silicone products, the mold release agent is sprayed on the side of the mold where the silicone product is non-stick, but sometimes it's not easy to adhere.

Solution: Use a spray bottle or any container filled with clean water. Spray the desired area of the product, then shape it afterward. The product will adhere to the spot you intended.

3. Temperature Control Adjustment

Products tend to stick to the mold's lower half when the mold temperature is low. At an upper mold temperature of 175°C and a lower mold temperature of 165°C, the product usually sticks to the lower mold during demolding.

In summary, when encountering difficulties in demolding silicone products, avoid simply switching to a demolding agent with better performance or increasing the usage and frequency of the agent, as excessive application can easily lead to mold surface contamination. This can, at a minimum, affect the appearance of the product. Moreover, using an excessive amount of demolding agent may also impact the adhesion of subsequent silk-screening and oiling processes. If the aforementioned methods are still not effective, consider adding an appropriate amount of internal demolding agent to the rubber material during material preparation, although this will increase the additional cost of the product.