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What is brush molding? Brush molding is a term in the mold making industry. To better explain it, let's first introduce mold making. Mold making is a process of recording the shape of an object to be replicated using specific materials to form a shell, which facilitates the filling of different materials into the shell to create an object with the original product's shape. There are many materials for making molds, which can be divided into hard molds and soft molds according to the materials. Brush molding is a method of making molds using soft mold materials, which has a wide range of applications and relatively low requirements for external conditions. Here, we will use silicone rubber, one of the soft mold materials, as an example to introduce the brush molding process of mold silicone rubber materials.

Generally speaking, brush molding of mold silicone rubber can be divided into single-sided mold and multi-sided mold. In fact, there is no difference between the two methods, only the difference lies in whether the entire brush molding process is divided into several parts. If it is divided into two parts, it is called a single-sided mold; if it is divided into multiple parts, it is called a multi-sided mold. The number of parts to be divided for brush molding depends on the shape of the product to be molded. The more complex the shape, the more times it needs to be divided. Of course, if the operator has a high level of skill, the number of mold pieces can be reduced.

When it comes to silicone molding, it is necessary to reiterate the processing of the product to be molded. This processing process needs to be determined according to the specific situation of the product. The purpose of the processing is to ensure that the product surface is smooth and perfect, so as not to affect the quality of the silicone mold. Of course, the reasonable selection of release agents is also one of the methods to improve the quality of mold making.

Brush molding also requires fixing the product to be molded, but it is slightly more complex than injection molding. Because brush molding usually involves molding different parts of a product several times, and then combining the molds of each part to form a complete mold to achieve the purpose of mold replication, the reasonable division of the parts of the product to be molded becomes a key issue. Generally speaking, some materials, such as industrial clay, are used to cover the parts that are not to be molded temporarily, and the exposed parts are molded separately.

After fixing the product to be molded, the silicone rubber needs to be prepared. During the preparation process, attention should be paid to the proper ratio of the colloid and the catalyst, and the two should be mixed evenly. If conditions permit, vacuum treatment should be carried out, but the vacuum time should not be too long.

The biggest difference between brush molding and injection molding is the process of silicone rubber contacting the product to be molded. We know that injection molding only requires pouring the prepared silicone rubber directly onto the processed product, while brush molding requires brushing it onto the product layer by layer with a brush. General silicone rubber products will have a brush molding process guide, just follow the instructions. It should be pointed out that if a mold with higher physical strength is required, some fiber materials should be added during the brush molding process, but glass fiber should not be used.

The application scope of brush molding is quite wide. Basically, any soft mold can be made using brush molding. Of course, using brush molding in some unnecessary situations will only increase costs.