Vented heating element for sterile cutting and welding together

Details Vented heating element for sterile cutting and welding together Vented heating element for sterile cutting and welding together

1984-12-27

1986-12-30

Bartis, Anthony

Electric heating

Heating devices

Combined with pressure application means

30140, 83171, 1563046, 156515, 156518, 1565831, 219221, 219227, 219544, 338248, 338250, 338251, 338255, B29C 2706, H05B 310, B26D 710

Patent

active

046330631

ABSTRACT:
A heating element for sterilely melt-cutting and welding together a pair of thermoplastic tubes transversely of the axis of the tubes includes an outer folded metal sheet, such as copper, aluminum, silver or gold, an electric resistance heating element of stainless steel or the like disposed inside the fold of the sheet and a dielectric adhesive disposed between the inner surfaces of the sheet and the resistor to insulate the resistor from the sheet and bond the structure together. The folded edge of the sheet forms the melting edge of the heating element. Vent channels within the adhesive and along at least one unfolded edge of the metal sheet are provided to vent entrapped gas from the element during heating. The channels have a predetermined cross-sectional area and length such that the pressure driven flow of entrapped gas passing through the channels is greater than the pressure-generating vaporization rate of the trapped gases to prevent the entrapped gas from reaching pillowing pressure within the heating element.

REFERENCES:
patent: 4210800 (1980-07-01), Van Bokestal et al.
patent: 4501951 (1985-02-01), Benin et al.

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