During the injection molding and forming stages, the master mold needs to be pre treated. After cleaning the master mold, a release agent such as Vaseline or specialized silicone release agent should be applied. For complex patterns, a layer of silicone can be applied first to enhance adhesion. The pouring method is divided into pouring method and brushing method: pouring method is suitable for smooth and simple products, and silicone needs to be slowly poured along the edge of the mold to avoid impact and bubble formation. Large or fine parts need to be poured in 2-3 times; The brushing method is used for slicing molds, which requires applying 2-3 layers of silicone gel. After each layer solidifies, paste gauze or fiberglass cloth to enhance strength, and then apply the next layer. The production of external molds usually involves enclosing the frame with plywood or wooden boards, pouring gypsum or resin and applying fiberglass cloth to form the external mold, providing support to prevent deformation.

The curing and demolding process needs to be left at room temperature (around 25 ℃) for 4-24 hours, with the specific time adjusted according to the silicone model. Low temperature needs to be extended, while high temperature (≤ 60 ℃) can accelerate curing but avoid aging. After curing, gently touch the surface without any sticky hands or dents to release the mold. Slowly peel off along the edge of the mold. Complex molds can be assisted by tools to avoid tearing. If secondary processing such as trimming or polishing is required after demolding, it should be carried out 24 hours after curing.

Post processing and quality inspection include trimming and polishing, trimming burrs, sanding the surface from coarse to fine with sandpaper until smooth, and repairing defects with silicone repair agent if necessary. Quality inspection requires checking the size deviation of the mold to be ≤ 0.2%, the clarity of the pattern, and the surface quality to ensure that it meets the requirements for mold flipping. Unused silicone should be sealed and stored away from light to avoid absorbing moisture and causing abnormal curing; Used molds can be coated with release agents for maintenance, extending their service life.

Special attention should be paid to the accuracy of proportion and mixing during the production process. Deviation in the proportion of curing agent or uneven mixing can lead to abnormal local curing of the mold, affecting its service life. Bubble control is crucial, as incomplete defoaming can easily result in pinholes, affecting the accuracy of the mold. During pouring, it is necessary to avoid rapid pouring and trapping of air. Environmental factors such as temperature, humidity, and impurities (such as water and oil) directly affect the curing effect and need to be strictly controlled. In terms of material adaptation, it is necessary to choose silicone hardness according to product requirements, such as using soft rubber for fine patterns and hard rubber for large items, to avoid reducing the number of mold flips or mold damage due to improper hardness.

This production process ensures the accuracy, durability, and production efficiency of molds through the comprehensive application of raw material characteristics, process control, and environmental management. It is suitable for mold manufacturing in resin handicrafts, gypsum products, building decoration, and other fields, providing reliable technical support for industrial production.

Regarding liquid silicone rubber, please refer to our website for details: IOTA Liquid Silicone Rubber