Do you understand why "TPE material needs baking"
Source：德創(chuàng)化工Time：2020-04-27Hits：3165
Why do TPE materials need baking? Because there is always some residual moisture in the TPE granules just produced, drying the materials can obtain better product appearance, such as some high-grade tool products and electronic products, which have high requirements on the appearance of TPE materials. It is recommended to dry the materials.
TPE manufacturers will dry TPE materials when packaging and warehousing finished products. Customers can directly unpack and use TPE materials during production and processing without drying. Attention should be paid to seal the bags (especially the materials that are not frequently used) for materials that have not been used up in unpacking to prevent moisture.
For TPE that is generally molded (such as extrusion, single material injection molding, tape casting), there is no need for drying and baking before molding.
Why do TPE materials need baking? Which conditions are necessary for baking?
1. For rubber-coated TPE, it is recommended to bake and dry the materials before forming.
Some rubber-coated TPE products (such as rubber-coated ABS,PC,PA, etc.) have higher requirements for the appearance gloss of the product surface. In order to avoid moisture that may remain in TPE particles volatilizing during molding, resulting in air streaks on the product and affecting the appearance, it is recommended to bake the product before molding. For TPE salespeople, for new customers of initial samples, it is more necessary to bake materials before samples in order to obtain satisfactory sample effect.
2. For TPE materials that have not been used and packaged in time after opening, baking is recommended
The rubber is not packaged in time after opening. If the relative humidity in the warehouse environment is high, the moisture content of TPE particles may exceed the standard. It is necessary to bake before molding.
Generally, the TPE/TPR of SEBS substrate is higher than that of SBS substrate, and the TPE/TPR with high hardness is higher than that of TPE and TPR with low hardness.
For TPE and TPR with lower hardness (below 60A), it is recommended to bake at 60~80℃ for 2 hours.
For TPE and TPR with higher hardness (above 60A), it is recommended to use materials at 80~90℃ for 2 hours.
