Method for forming a remote annular rim of plastic material

Details Method for forming a remote annular rim of plastic material Method for forming a remote annular rim of plastic material

B - Operations, Transporting

29

C

18/714

B29C 45/00 (2006.01)

Patent

CA 1049726

METHOD FOR FORMING A REMOTE ANNULAR RIM OF PLASTIC MATERIAL ABSTRACT OF THE DISCLOSURE A method is disclosed for forming a remote mounting web and rim of plastic material to provide that rim with good structural strength and reliable integrity. The method is intended for use with injection molding plastic forming equipment and is compatible with transfer molding techniques. The remote rim is formed of plastic material which is re- quired to flow under heat and pressure from a central location through web portions to form an annular exterior rim portion which must be continuous and free from defects. In order to assure that the rim portion has the desired integrity and freedom from defects, the mold is provided with means defining high resistance flow paths and low resistance flow paths such that a staggered and overlapping flow pattern is provided for the plastic material. This prevents knit lines from forming across the rim which would constitute a defect or in an extreme case would provide a discontinuity in the annular rim portion. The high resistance flow paths comprise sharp angular changes in flow direction coupled with a relatively thin cross sectional flow area while the low resistance flow paths comprise a gradual angular change in flow direction pro- vided by a relatively large radius of curvature combined with a relatively thicker cross sectional flow area. At the annular rim portion, a relatively short high resistance flow path is arranged in radial proximity to a relatively long low resistance flow path and to be circumferentially adjacent to a second relatively long low resistance flow path.

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