Coating processes – Nonuniform coating – Paper or textile base
Patent
1995-09-27
1996-11-05
Lusignan, Michael
Coating processes
Nonuniform coating
Paper or textile base
427361, 4273982, 101487, 34392, B05D 312, B05D 500, B41F 2304
Patent
active
055715648
ABSTRACT:
An offset printing apparatus has a fluid-cooled nip roll which, in use, is placed in intimate contact with a hot, rapidly moving, endless printed and dried paper web so as to improve the cooling efficiency of the first downstream chill roll, permit the use of fewer chill rolls, and avoid condensate streaking. The apparatus takes the form of a nip roll specially designed to press the web into intimate contact with the first downstream chill roll while avoiding damage to the web, nip roll, or chill roll, and while avoiding ink picking by the web surface contacted by the nip roll. Employing the nip roll in the system also permits the use of a substantially shorter dryer and fewer chill rolls as compared to a conventional system operating at the same web speed. The coolant circuit for the nip roll includes a warmup loop which temporarily circulates warm fluid through the nip roll when the system is first taken off-line, thereby preventing condensate formation or frost formation on the nip roll. The warmup loop preferably includes a heat changer that uses waste heat from the coolant circuit to heat the warmup fluid. Two or more nip rolls can be cooled and heated by a single coolant circuit.
REFERENCES:
patent: 3886683 (1975-06-01), Hudgin et al.
patent: 4263724 (1981-04-01), Vits
patent: 5121560 (1992-06-01), Daane et al.
patent: 5471847 (1995-12-01), Murray et al.
patent: 5471927 (1995-12-01), Frank et al.
Hansen Daniel J.
Helms Randall D.
Advance Systems Inc.
Lusignan Michael
Parker Fred J.
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