Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1986-07-03
1990-05-29
Ball, Michael
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
1562733, 1563042, 1563045, 1563046, B29C 2706
Patent
active
049292935
ABSTRACT:
The method of joining together the ends of ducts made of melt processible fluoropolymers such as Teflon PFA, which are characterized by a high degree of chemical inertness and a continuous service temperature in the range of 300.degree. to 500.degree. F. The joining of the ends together is accomplished by the use of infrared heat emanating from an infrared heat source with temperatures in the range of 1250.degree. to 2000.degree. F. and spaced from the ends of the duct by approximately 1/4" to 2 inches for a period of time approximately up to one minute which may be gauged by the appearance of the duct end as it becomes visibly molten to a depth of approximately 1/2". The infrared heater is then removed and the ducts are put together under almost no pressure and the ducts are held briefly, in one form, less than a minute, to quickly establish a joint that becomes at least as strong and expectedly stronger than the original ducts.
REFERENCES:
patent: 2665738 (1954-01-01), Caskin
patent: 3013925 (1961-12-01), Larsen
patent: 3883369 (1975-05-01), Badger et al.
patent: 4253500 (1981-03-01), Williams
Ball Michael
Fluoroware, Inc.
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