After the vulcanization of rubber products, in order to ensure the appearance quality and performance of the product, a series of post-processing processes are usually required in order to become a qualified finished product. This includes: cutting edge trimming of rubber mold products, so that the surface of the product is smooth and the outline size meets the requirements; There are also some special processes, such as surface treatment of products, so that the performance of special purpose products has been improved; Then the products containing fabric skeleton such as tape, tires and other products should be cooled by hot stretching and vulcanization under inflation pressure, only in this way can we ensure that the size and shape of the products are stable and have good performance.
Finishing treatment is an important step in the post-curing of rubber products. It mainly includes removing the excess rubber edge on the edge of the product, so that the surface of the product is smooth and the outline size meets the requirements. There are two kinds of dressing methods: manual dressing and mechanical dressing. Some rubber products require special processing to improve their performance. For example, the physical and mechanical properties can be stabilized by heat treatment, the cross-linked structure is more perfect, and the internal stress caused by molding vulcanization can be eliminated. Surface chemical treatment, such as surface chlorination, can improve the hardness of the rubber surface and reduce the friction coefficient of dynamic seals. In addition, the surface coating can also improve some properties of the surface of the product.
Manual trimming is an ancient method, including the use of punches to cut the glue edge, with scissors, scrapers and other tools to remove the glue edge. The quality and speed of this method will vary depending on the skill of the operator. The requirement of manual dressing is that the geometric size of the finished product must meet the requirements of the product drawing, and there must be no scratching, scratching and deformation. Mechanical trimming refers to the process of trimming rubber products using various special machines and corresponding process methods. This method is a more advanced dressing method at present, including mechanical punching trimming, mechanical cutting trimming, mechanical grinding trimming and other ways.
Performance post-treatment technology is to further improve the performance of products through certain physical and chemical methods, and further extend the service life. This includes heat treatment, surface chemical treatment and surface coating. (1) Heat treatment can stabilize the physical and mechanical properties, make the cross-linked structure more perfect, eliminate the internal stress caused by pressing vulcanization, reduce the compression permanent deformation, and improve the service life. For example, silicone rubber, fluorine rubber, acrylic rubber and other products for secondary vulcanization. (2) Surface chemical treatment can improve the surface hardness of rubber, without affecting the elasticity and strength of the body material. It is mainly used for sealing products, such as oil seals, which can reduce the friction coefficient and improve the service life. (3) The surface coating is to improve some properties of the surface of the product, such as wear resistance, corrosion resistance, etc.
Rubber products containing fabric skeleton, such as tape, tires, etc., need to be cooled by hot tension after vulcanization and cooled under inflation pressure after vulcanization to ensure the size, shape stability and good performance of the product. After vulcanization, the tape products must be hot stretched and cooled to ensure the appearance and shape of the products and good performance. Avoid belt body elongation due to temperature increase during use.
The shrinkage rate of rubber sponge products is large, so special post-treatment is required to stabilize its size. The second vulcanization method or the vulcanized product is put into boiling water for a certain time can make the vulcanization size of the sponge product stable.
The vulcanization post-treatment of rubber products is an important link to ensure its quality, and a reasonable post-treatment process can not only improve the appearance and dimensional stability of the product, but also enhance its performance and extend its service life. Therefore, manufacturers should pay attention to this link and choose the appropriate treatment method to meet the specific needs of different products.
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