How to solve the dark lines on the surface of silicone products

1、 Why do silicone products have dark marks

1. Silicone mold

The mold is the core of silicone products, and the material selection on the mold steel is the main factor. Secondly, the poor surface in the processing process is likely to be due to the deformation of the mold due to too many pressing times, resulting in the appearance of silicone products. Secondly, in the process of mold finishing, the precision of the mold determines the mold closing line of the product, as well as the self-disassembling edge and the edge wheel angle.

2. Silicone rubber raw material

Due to the different properties of raw materials of silicone rubber products and the different proportions of products, the understanding of the external adverse phenomena is still based on the distribution proportion of the amount of silica and silicone resin added in the products. Because the raw materials are semi-transparent solid rubber, the mixing uniformity of the rubber compound and vulcanizing agent depends on the quality of the rubber compound during the mixing process, and the factors of the bad surface of the products are precisely the above reasons.

3. Silicone product molding and vulcanization

In the process of molding and vulcanization, the product's exhaust mode and trapped air stroke determine the bulge phenomenon of silicone rubber products. Inaccurate time and temperature allocation may lead to the appearance of dark marks. In addition, it is very important to the operating methods and remarks of the machine personnel. In the end, the main thing in the processing process is to change according to the circumstances, and the appropriate parameter configuration of silicone rubber products.

Silicone mold

2、 What to do if dark marks appear on silicone products

Silicone products are colorless, tasteless and non-toxic. To change the silicone products into colorful colors, it is necessary to add "color masterbatch". Therefore, there must be no mistake in the selection of color masterbatch. If the temperature of color masterbatch is not good, then the silicone products will basically become waste products, because the color masterbatch will be incorporated into the silicone products for high-temperature molding, At this time, the color masterbatch can only change color of silicone rubber products by melting at high temperature. If the color masterbatch affects the whole production due to its poor temperature resistance, the consequences are self-evident. Therefore, the color masterbatch must be selected appropriately.

When selecting silicone rubber raw materials, we must strictly control them. For example, it may be difficult to distinguish the color difference and hardness of two different silicone rubber raw materials on the naked eye, but in fact, there are differences between the two. If these two batches of silicone rubber raw materials are mixed into a shape, then if there is a small color difference found in the quality inspection after forming, it can not be shipped. Our quality inspection is very strict, Those with color difference can only be treated as defective products. Therefore, when selecting silicone rubber raw materials, it must be clear that there is no mixing. It is important to know the source. The first step is wrong, and all subsequent processes can only be soy sauce.

Attention should also be paid to the cutting process of silicone rubber products, because if the cutting rubber material is too thick or too narrow, it will be inconvenient to cut silicone rubber, and at the same time, it will cause poor surface color of silicone rubber products after molding. Even in the cutting process, it is necessary to ensure the quality of products.