Presses – With additional treatment of material – Cutting – breaking – piercing – or comminuting
Patent
1986-07-17
1988-04-19
Feldman, Peter
Presses
With additional treatment of material
Cutting, breaking, piercing, or comminuting
100 47, 100162B, 100170, 29113AD, 219 1071, 219370, B30B 1534, B30B 1504
Patent
active
047381965
ABSTRACT:
An electrical air heater for a calender roll diameter control device is described. The heater comprises a tube for directing a flow of air along the inside of the tube from a plenum toward an object which is to be heated. An electrically resistive heating element is mounted inside the tube to heat the flow of air as it flows from the rear to the front of the tube. Since the air is heated by the heating element inside the tube, the air is coolest when it first enters the tube and hottest where it escapes at the front of the tube. Similarly, the heating element is cooled by the air and is, therefore, hottest near the front of the tube where the heated air escapes. The hotter front end of the heating element tends to burn out faster than the cooler end of the heating element. To prolong the life of the heater, openings are provided in the tube wall to admit a flow of cooling air at the hottest part of the heating element.
REFERENCES:
patent: 2609477 (1952-09-01), Borda et al.
patent: 3094606 (1963-06-01), Ferris
patent: 3668370 (1972-06-01), Pattison
patent: 4573402 (1986-03-01), Sharma et al.
Feldman Peter
Measurex Corporation
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