Method of making a dimensionally stable tube type plastic heat e

Details Method of making a dimensionally stable tube type plastic heat e Method of making a dimensionally stable tube type plastic heat e

1997-09-03

2000-08-01

Cuda, I.

Metal working

Method of mechanical manufacture

Heat exchanger or boiler making

29890044, B23P 1526

Patent

active

060948167

ABSTRACT:
Plastic tube-type heat exchanger structures are made with partially crystallized partially aromatic polyamides of high glass transition temperature. The structures are then annealed to further crystallize the polyamides, causing shrinkage and building up residual tensile stresses. These stresses counteract the swelling caused by water absorption and temperature rise during use of the heat exchanger and keep the structures dimensionally stable.

REFERENCES:
patent: 4577380 (1986-03-01), Warner
patent: 4923004 (1990-05-01), Fletcher et al.
patent: 4955435 (1990-09-01), Shuster et al.
patent: 5078946 (1992-01-01), Fletcher et al.
patent: 5469915 (1995-11-01), Cesaroni
patent: 5499676 (1996-03-01), Cesaroni

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