When does TPE material need to be dried?
Some of the TPE particles just produced always have some residual moisture. Drying the material to the treatment can result in a better product appearance, such as high-end tool products and electronic products that have high requirements for the appearance of TPE materials.
When the finished product is packaged in a warehouse, the TPE manufacturer processes the dry TPE material. When the customer is in production and processing, the customer can open the package directly and use it without drying. Note the unfilled rubber and the bag should be sealed (especially infrequently used materials) to prevent the material from getting wet.
For general molding (eg extrusion, single material injection molding, casting) TPE, no dry baking treatment is required prior to molding.
What are the conditions that need to be dried ?
1. TPE with rubber coating, it is recommended to dry before molding, dry
Encapsulated TPE products (such as encapsulated ABS, PC, PA, etc.), some have higher requirements on the appearance of the product surface gloss. In order to avoid residual moisture that may be present in the TPE particles, volatilization during the molding process causes gas to appear in the product. Granules, affecting the appearance, it is recommended to bake before molding. For TPE sales personnel, for new customers of the initial sample, in order to obtain a satisfactory sample impact on the customer, it is more necessary to bake before the sample.
2. After the opening of the seal, the TPE material that has not been used in time and not packaged in time is recommended. After the opening of the seal, the compound is not packaged in time. If the relative humidity of the warehouse is environmental, the moisture of the TPE particles may exceed the standard. It must be baked before molding.
The TPE/TPR of the general SEBS substrate is higher than the TPE/TPR baking temperature of the SBS substrate, and the TPE/TPR baking temperature of the high hardness is higher than that of the low hardness TPE and TPR.
TPE and TPR hardness is lower (less than 60A), the recommended baking temperature is 60~80 °C, and the drying time is 2 hours;
The hardness of TPE and TPR is higher (60A or more), the recommended material temperature is 80~90°C, and the baking time is 2 hours.
For specially tailored TPE materials, consult a TPE manufacturer's professional technician for baking before molding.
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