What are the reasons for the appearance of mucous membrane or sticking of silicone products during mold release?

The occurrence of mucous membrane or sticking phenomenon during the molding of silicone products is usually caused by the following reasons:

1. Mold design issues

Improper surface treatment of the mold: The mold surface has not undergone appropriate demolding treatment, such as insufficient coating or poor coating quality, resulting in silicone products adhering to the mold during demolding.
Unreasonable mold structure: Unreasonable mold design, such as poor exhaust and uneven structure, leads to uneven stress on silicone products during mold release, causing mucous membranes or sticking.

2. Material issues

Improper selection of silicone material: The viscosity or flowability of silicone material is not suitable, which makes it difficult to evenly fill the mold during the molding process and prone to adhesion when exiting the mold.
Material quality issues: The silicone material itself has quality problems, such as impurities, bubbles, etc., which cause the surface of the formed product to be uneven and easy to adhere to the mold.

3. Molding process issues

Excessive or insufficient vulcanization temperature: Excessive vulcanization temperature can cause rapid curing of silicone materials, generate internal stress, and lead to mucous membranes; If the vulcanization temperature is too low, it will cause incomplete curing of the silicone material, which is prone to adhesion during mold release.
Insufficient vulcanization time: Insufficient vulcanization time can cause the silicone material to not fully cure and easily adhere to the mold during demolding.
Uneven pressure: Uneven pressure during the molding process leads to uneven distribution of silicone material in the mold, making it easy to adhere when exiting the mold.

4. Operational issues

Incomplete mold cleaning: Incomplete mold cleaning can result in residual impurities or oil stains that affect the flow and solidification of silicone, leading to mucous membranes or sticking.
Improper use of release agent: Improper use of release agent, such as insufficient dosage or poor quality, can cause silicone products to adhere to the mold during demolding.

5. Environmental factors

Environmental temperature and humidity: If the temperature and humidity of the molding environment are too high or too low, it will affect the curing effect of the silicone material, causing the mucosa or sticking.
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In response to the above reasons, the following measures can be taken to solve the problem of mucous membrane or sticking when silicone products are molded:
Optimize mold design: Ensure proper surface treatment of the mold and use high-quality release coatings; Optimize the mold structure to ensure smooth exhaust and uniform structure.
Choose suitable materials: Choose silicone materials with appropriate viscosity and flowability to ensure reliable material quality.
Optimize molding process: Adjust the vulcanization temperature and time to ensure uniform vulcanization pressure and avoid excessive temperature or insufficient time.
Standardized operating procedures: Ensure thorough cleaning of the mold, use an appropriate amount of high-quality release agent, and avoid mucous membranes or sticking caused by improper operation.
Control environmental factors: Control the temperature and humidity of the molding environment to ensure stable molding results.

summary

There are various reasons for the adhesive film or sticking of silicone products during molding, involving mold design, material selection, molding process, operation, and environment. By analyzing the specific reasons and taking corresponding solutions, the occurrence of mucosal or adhesive phenomena can be effectively avoided.