In the production process of Silicone Rubber products, demoulding is the most critical step. No matter who is more or less likely to encounter the problem of difficult demoulding, such as the problem of difficult demoulding is very serious, which will seriously affect the production efficiency of silica gel products. How to solve the problem of difficult demoulding? Following are several methods of forming difficult demoulding for reference.
1. Surface treatment of dies
1. The silicone rubber product forming die should be washed before the oil pressure forming machine. Especially the new die which has just been discharged must be sandblasted first.
2. Choose different washing sand for male and female moulds.
3. The mold that has just been sandblasted must be heated to a sufficient temperature before it is laid out for moulding, and the release agent must be sprayed well before moulding.
It is noteworthy that the electroplating die must not be sandblasted, including resin sandblasting.
2. Spray release agent treatment
In the process of forming silicone rubber products, the mold on which side the silicone rubber products do not stick is sprayed demoulding agent, but sometimes it is not easy to stick.
Solution: Use spray bottles or other clean water to spray where you want the product to stick. After spraying, the product will stick to where you want it to stick.
3. Mould Temperature Adjustment
Products like to stick to half of the lower die temperature. When the upper die temperature is 175 Celsius and the lower die temperature is 165 Celsius, products are usually stick to the lower die when lifting the die.
In short, when it is difficult to demould silicone rubber products, do not replace demoulding agents with better demoulding performance for the sake of convenience, or increase the usage and frequency of demoulding agents. Spraying too many demoulding agents can easily cause fouling on the surface of the mould, which will have a certain impact on the appearance of the product, and using too many demoulding agents will also affect the appearance of the product. The adhesion ability of screen printing and oil injection at the later stage of ringing. If the effect of the above method is not very good, it can be considered to add an appropriate amount of internal release agent in the compound when preparing materials, but it will increase the additional cost of the product