Method of forming a water heater tube

Details Method of forming a water heater tube Method of forming a water heater tube

1996-01-19

1998-04-21

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to work

Polymerizing, cross-linking, or curing

264156, 264296, 264322, 264323, B29C 7104, B29C 5702

Patent

active

057414580

ABSTRACT:
A process for the fabrication of a thermoset water heater tube is described. By shifting to a thermoset rather than a thermoplastic, a much higher heat distortion temperature is achieved when compared to standard thermoplastic materials such as polypropylene, polyethylene, ABS or PVC. The stress crack resistance is also higher as is the dimensional stability. These desirable properties can be achieved by using a lower cost material, in contrast to a more expensive thermoplastic, and solves the problem of water heater tube failure when dry firing conditions are present. The invention utilizes thermoplastic processing conditions, with subsequent crosslinking to form a thermoset. This combines the best features of both types of materials: (1) the ease of thermoplastic processing; combined with (2) the desirable physical properties of a thermoset.

REFERENCES:
patent: 4209597 (1980-06-01), Bremholt
patent: 4316870 (1982-02-01), Rowley
patent: 4446084 (1984-05-01), Rowley
patent: 4525136 (1985-06-01), Rowley
patent: 4783030 (1988-11-01), Imgram
patent: 4964394 (1990-10-01), Threatt
patent: 5622670 (1997-04-01), Rowley

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