In the production process of natural rubber products, demoulding of silica gel products is the most critical step, no matter who more or less will encounter molding difficult demoulding problem, such as molding difficult demoulding problem is very serious, will seriously affect the production efficiency of silica gel products, so in the face of difficult demoulding problem, how to solve? The following describes several molding difficult demoulding solutions for reference.

1, the surface treatment of the mold

1) The molding mould of silica gel products is washed before the oil pressing machine, especially the new mould that has just been released must be sandblasted first;

2) Choose different washing sand for male and female molds.

3) The mold that has just been sandblasted must be heated to enough temperature and then discharged for forming, and the release agent must be sprayed before forming.

It is worth noting that electroplating molds must not be sandblasted, including resin sand.

2, spray release agent treatment

In the molding of silica gel products, silica gel products do not stick to which side of the mold to which side of the mold spray release agent, but sometimes not easy to stick.

Solution: spray bottle or other clean water, hope the product stick where spray, spray after molding, the product will obediently stick to the place you want to stick.

3. Adjustment of mold temperature

The product likes to stick to the lower half of the mold temperature. When the upper mold temperature is 175℃ and the lower mold temperature is 165℃, the product is usually stuck to the lower mold when lifting the mold.

In short, encounter the silicone products is difficult to demould, for convenience and do not change the demoulding performance better release agent, or increasing the usage and frequency of release agent, spray mold release agent is easy to cause too much mold surface dirt, light cause certain influence to the appearance of the product, use too much at a later stage of release agent can also affect the adhesion ability of silk screen, fuel injection. If the effect of the above method is not very good, you can consider adding an appropriate amount of internal release agent in the rubber material when preparing the material, but it will increase the extra cost of the product.