Co-molding consists of using TWINTEX® woven Roving or consolidated sheets with a flowing material like GMT PP sheet stock or Thermoplastic bulk molding compound (TPBMC).

TPBMC can be reinforced with TWINTEX® pellets. Co-molded parts benefit from the use of continuous glass fibers for increased toughness and durability, and from the use of the following material, which allows for increased design freedom and lowers cost.

Description of the process

- Control tool temperature between 20°C and 80°C.
- Heat TWINTEX® from 200°C to 220°C in an infrared or convection oven.
- Transport the molten TWINTEX® from the oven to the mold rapidly to prevent the polypropilene matrix from cooling prior to mold closing.
- Position molten flowable polypropylene material into the mold corresponding to the thicker areas of the part.
- Close mold rapidity to ensure parts are formed prior to polypropylene solidification.
- Remove part from mold after part has cooled.