How to deal with impurities and black spots on the surface of silicone hose

1： Reasons for impurities and black spots on the surface of silicone hose:

1: Raw materials lead to poor quality. 20% of the reasons for the black spots in the production of silicone rubber tubes / strips come from the black spot impurities in the raw materials.

2: Excessive black spots caused by secondary rubber mixing. After long-term storage, the vulcanizing agent of the general rubber compound is invalid. At this time, it is necessary to re refine and add the vulcanizing agent. Black spots and impurities may also appear in the secondary rubber compound.

3: The molding operation causes. During the production process, the exhaust stroke of the machine is too large, and black spots and impurities may be inhaled during exhaust.

2： Treatment method for impurities and black spots on the surface of silicone hose:

1: Before mixing rubber, it is necessary to carefully check whether there are black spots and impurities in the product.

2: During the secondary compounding process, rubber contamination may occur from hands, vulcanizing agent and air, resulting in black spots and impurities in the molded vulcanized products.

3: During the molding operation, the surrounding environment of the machine and the indoor environment need to be strictly controlled. Don't pay attention to too many sundries on the mold. There are many sundries on the newly launched mold. Therefore, generally, the silicone product processing manufacturers will sand blast or spray Teflon on the mold to keep the mold clean, This can solve the key black spots; In the process of weighing materials, it is necessary to pay attention to the cleanness of both hands, and clean up the worktable and all surrounding items that may cause black spots and impurities. Human phenomenon is an important factor for the appearance of bad phenomena. Therefore, it is necessary to tidy up and rectify yourself and develop good operation habits to prevent the appearance of bad black spots!

Product impurity black spots are a common problem of silicone tubes / strips. Once there are black spots, the whole tube will be scrapped, which is a headache for many silicone products manufacturers. In addition to silicone tubes, the black spots in other silicone products are also difficult to control. Therefore, for the black spots, they need to be controlled in their source materials, and the dirty impurities of the product should be handled at the same time of rubber mixing, Attention shall be paid to keep the hands of the operators, the tools in contact with the rubber, the production machine, and the extrusion lines clean.