Patent ID: 6241836
Filing Date: 2001-06-05
Classification: B29C,B29K,B29L

Abstract:
A method of making a welded bond between complementary abutting surfaces of two thermoplastic resin bodies having disparate melting temperatures, comprising:forming the higher melting resin body with an abutting surface characterized by a pattern of peaks and valleys having an amplitude of up to one-half of one millimeter,pressing said abutting surface of said higher melting body against the complementary abutting surface of a said lower melting point resin body,rubbing the engaging surfaces together while controlling the pressure of engagement, the amplitude and duration of the rubbing so as to melt at least a portion of said peaks on the higher melting body and the surface region of the lower melting point resin body, andstopping the rubbing and allowing the molten material between the two bodies to solidify so that a weld joint is formed between the bodies.