Mold for plastic needlepoint sheet

Details Mold for plastic needlepoint sheet Mold for plastic needlepoint sheet

B - Operations, Transporting

29

C

18/708

B29C 33/00 (2006.01) B29C 45/26 (2006.01) B29D 28/00 (2006.01)

Patent

CA 1185760

ABSTRACT OF THE DISCLOSURE An injection mold for molding plastic needle- point sheets which have a plurality of aligned rows of perforations which define plastic threads therebetween in a lattice configuration. The mold has engageable top and bottom mold body halves with open uniform mold channels formed in each half in a lattice configuration wherein the channel lattices of the mold halves cooperatively mate with each other upon engagement to define a mold cavity therebetween for the molding of the needlepoint sheet. The lattice channels in the mold body halves are constructed whereby the lattice channels in one half define a greater total volume than that of the other half, such that the greater volume of plastic to be molded in the mold cavity is received in the ejection half of the mold. In order to facilitate removal of the molded sheet from the mold, the lattice mold channels in the mold body halves are contoured to define a resultant cross section of the thread of a needlepoint sheet to be molded which is polygonal. In order to compensate for possible misalignment or offset of the mold halves during the molding operation, the cross-sectional opening width of the lattice mold channels in one mold half are greater than that of the other mold half to provide an intentional mating mismatch between the mold channel openings of the respective mold halves. 1.

407431

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