Heating – Processes of heating or heater operation – Continous strip – strand or web passed longitudinally through...
Patent
1987-10-26
1989-03-21
Yuen, Henry C.
Heating
Processes of heating or heater operation
Continous strip, strand or web passed longitudinally through...
432 60, 219216, 355 3FU, H05B 310, F27B 928
Patent
active
048138681
ABSTRACT:
A heating roller having a surface layer of Teflon and a pressing roller having a surface layer of an elastomeric material are held rotatably against each other for fixing a full-color toner image to a toner carrier therebetween. The ratio (1/V) between the nip width 1 of the heating and pressing rollers and the peripheral speed V of the rollers is selected to be at least 0.06, and the pressure of contact per unit area between the heating and pressing rollers at their nip region is selected to be at least 7 kg/cm.sup.2, for increasing a temperature range corresponding to the rubber range of toners used. The toners which have a small molecular weight and a small molecular weight distribution are prevented from being offset before the toners are fixed. Teflon with desirable features can therefore be used as the surface layer of the heating roller.
REFERENCES:
patent: 4038026 (1977-07-01), Wada et al.
patent: 4101267 (1978-07-01), Mueller
patent: 4119831 (1978-10-01), Sato
patent: 4487158 (1984-12-01), Kayson
patent: 4639405 (1987-01-01), Franke
patent: 4653897 (1987-03-01), Fromam
patent: 4727394 (1988-02-01), Bov, Jr. et al.
patent: 4745431 (1988-05-01), Kogure et al.
Ricoh & Company, Ltd.
Yuen Henry C.
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