Patent classifications
B29C2043/5015
Ejection Tabs for Compression Molding Tools and Processes
A compression-molding tool includes cutouts (i.e., recesses) that are machined into the male mold portion of the tool along a boundary edge thereof. During molding, liquefied resin and fibers fill the cutouts, forming ejection tabs along the upper surface of the part. The ejection tabs couple the part to the male mold/plunger. The ejection tabs, along with the finished part, remain coupled to the plunger as it is withdrawn from the female mold portion, thereby releasing the finished part from the mold cavity.
COMPRESSION MOULDING DEVICE AND METHOD
Described is a compression moulding device and method, wherein the device comprises: a female element (2) for housing a dose made of material suitable for compression moulding; a male punch (5) which can be at least partly inserted in the female element (2) to compress said dose and make a relative product; wherein said punch (5) has an outer surface (10) for moulding the dose, and wherein said punch (5) comprises a first portion (6) slidable relative to at least a second portion (7) between a moulding condition wherein the second portion (7) radially compresses the dose against the female element (2) and a collapsed condition wherein the second portion (7) is radially retracted away from the dose.