Method and apparatus for heat sealing plastic members

Details Method and apparatus for heat sealing plastic members Method and apparatus for heat sealing plastic members

1982-09-30

1985-09-17

Kimlin, Edward

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

With means applying wave energy or electrical energy...

156382, 1565833, 1562724, 1562737, 1562751, 156285, 156293, 156294, 264315, 425508, 219 1043, 219 1053, 219 1075, B32B 3100, B30B 502, B30B 1534, B23K 1302

Patent

active

045418918

ABSTRACT:
A heat sealing apparatus for bonding plastic tubular members includes a seamless, tubular, elastic heating element encircling the plastic members. In one form, an annular inflatable bladder filled with hydraulic fluid encircles the heating element, and includes a rigid outer wall and an elastic inner wall that is bonded to the outer surface of the heating element. When the bladder is pressurized the heating element is compressed inwardly to a bonding position against the plastic members. The plastic members are then heated to a bonding temperature by the heating element resulting in a fusion bond along their interface. When the bladder is evacuated the heating element opens outwardly to be spaced from the plastic members to allow removal of the sealed members. The heating element includes a uniform dispersion of susceptor particles that will generate heat when exposed to the high frequency magnetic field of an induction heating coil. A method of heat sealing tubular plastic members is also disclosed.

REFERENCES:
patent: 3458611 (1969-07-01), Roberts
patent: 3753499 (1973-08-01), Gwilliam
patent: 3805961 (1974-04-01), Clark et al.
patent: 3837965 (1974-09-01), Mahon et al.
patent: 3865662 (1975-02-01), Segal
patent: 3888618 (1975-06-01), Jones
patent: 4095480 (1978-06-01), Schwabauer
patent: 4132578 (1979-01-01), Gell, Jr.

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