Do TPE materials need baking before injection molding?
Source：德創化工Time：2021-03-19Hits：2512
Why do TPE materials need baking materials? Because there is always some residual moisture in the TPE granules just produced, drying the materials can get better product appearance. For example, some high-grade tool products and electronic products have high requirements on the appearance of TPE materials, so it is recommended to dry the materials.
TPE manufacturers will dry TPE materials when the finished products are packaged and put into storage. Customers can directly open the package for use during production and processing, and do not need to do drying treatment. It should be noted that the bags should be sealed (especially the infrequently used materials) to prevent the materials from getting wet after a long time.
For TPE of general molding (such as extrusion, single material injection molding and tape casting), drying and baking treatment are not required before molding.
Why do TPE materials need baking materials? In what circumstances is it necessary to bake?
1. for TPE coated with rubber, it is recommended to bake and dry it before molding
Some encapsulated TPE products (such as encapsulated ABS,PC,PA, etc.) have higher requirements on the surface gloss of products. In order to avoid the possible residual moisture in TPE particles, which will volatilize during molding, which will lead to the appearance of products with gas marks and affect the appearance, it is recommended to dry the materials before molding. For TPE salespeople, it is more necessary to bake the samples before the samples in order to obtain satisfactory sample results for the new customers of the first samples.
2. It is recommended to bake TPE materials that have not been used and packaged in time after opening
If the rubber is not packaged in time after opening, if the relative humidity of the warehouse environment is high, the moisture of TPE particles may exceed the standard, so it is necessary to bake before molding.
Generally, the baking temperature of TPE/TPR of SEBS substrate is higher than that of SBS substrate, and the baking temperature of TPE/TPR with high hardness is higher than that of TPE and TPR with low hardness.
For TPE and TPR with low hardness (below 60A), it is recommended that the baking temperature be 60~80℃ and the baking time be 2 hours.
For TPE and TPR with higher hardness (above 60A), it is recommended that the material temperature be 80~90℃ and the drying time be 2 hours.
Dongguan Dechuang Chemical Co., Ltd. is a professional manufacturer of TPE/TPR rubber and plastic materials. Dechuang Company has developed thousands of TPE materials with different properties. The company has a group of skilled engineers and professional sales consultants. If you are developing TPE related products, you can contact us at any time and we will serve you wholeheartedly!
