| 摘要 |
A mold insert member is provided to enable molding unitary composite parts from two materials so that the materials co-diffuse at their interface. The insert member is rotatable relative to a stationary molding die to define, in a first position, a first molding cavity for receiving a first molding material and, in a second position, a second molding cavity contiguous with the first molding cavity adapted to receive a first molding material. The insert member includes a substantially circular cylindrical main body portion defining a longitudinal axis. At least one arcuate mold lip is formed on an end of the main body portion and is adapted to cooperate with a molding die when the insert member is disposed in a first position relative to the molding die. At least one cavity area is formed on the end of the main body portion. The cavity area is adapted to define, together with the molding die, a second molding cavity when the insert member is rotated into a second position. The second molding cavity is adapted to receive a second molding material. The insert member is rotatable relative to a stationary molding die so that the first and second materials can be injected into the molding die without opening the die between injection shots.
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