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11 Points to Pay Attention to in Forming TPE Encapsulated Material
Source：德創(chuàng)化工Time：2020-06-07Hits：2210
One of the important application fields of TPE thermoplastic elastomer materials is encapsulation/two-material injection molding. The following parameters and conditions should be paid attention to in TPE encapsulation/double material injection molding:
1 TPE compatibility between TPE and hard cementing components needs to be matched. The molecular solubility is close to each other, so the molecular compatibility is better.
2 sharp corners should be avoided as much as possible in the design to ensure excellent contact between TPE and hard rubber parts and improve bonding effect;
3. Avoid leaving gas in the mold cavity through proper exhaust.
4. Balance the thickness of TPE with the expected tactile sensation;
5 Maintain the temperature of TPE melt to ensure the bonding effect;
6 TPE materials need to be baked and reprocessed for overmolding, so as to reduce water lines on the product surface and obtain the effect of uniform surface color.
7. The carrier resin of the selected color masterbatch is compatible with TPE and structural materials;
8 For smooth surfaces, special treatment shall be carried out in order to increase the contact surface between soft glue and hard glue and strengthen the bonding effect.
9 TPE should have good fluidity. Because the thickness to size ratio of TPE coating layer is very small, TPE usually needs to flow through a longer path and thin wall area to fill the mold.
The flow length/product thickness ratio of 10 TPE is less than 150: 1;
Use good adhesive.
