Method of fusion bonding low density thermoplastic bodies

Details Method of fusion bonding low density thermoplastic bodies Method of fusion bonding low density thermoplastic bodies

B - Operations, Transporting

29

C

18/650

B29C 65/18 (2006.01) B22C 7/02 (2006.01) B29C 65/00 (2006.01) B29C 65/20 (2006.01)

Patent

CA 1283263

-19- Abstract of the Disclosure A method for contact fusion bonding of compressible, low density thermoplastic parts is disclosed, which comprises essentially: (a) fluidizing only a surface film on opposed mateable margins of the thermoplastic parts by precompressing the margins against a transversely stationary heated platen located therebetween and, prior to fluidization, continuing such contact to promote such fluidization by thermal conductivity and make heat settable a limited, predetermined, nonmelted subsurface layer of said mateable margins; and (b) within a time period during which said surface films remain fluid, withdraw said platen from between said opposed margins with minimal separation while bringing the mateable margins together with sufficient force to merge said fluid films and compress said subsurface layers a predetermined moulded dimension. The time period during which the fluid films must be merged after removal of the heated platen is typically less than one second for most low density thermoplastics (low density here being used to mean less than or equal to 2.5 lbs/ft3).

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