EP 0449841 B1 19930310 - PROCESS FOR GLAZING PAPER WEBS
Title (en)
PROCESS FOR GLAZING PAPER WEBS
Publication
Application
Priority
CH 474188 A 19881222
Abstract (en)
[origin: WO9007027A1] Glazing is effected in the nip (3) of a calender (2) under the action of pressure, moisture and heat. The desired surface quality is obtained by bringing the surface of the paper or cardboard web (1) to be glazed in the nip (3) to a state above the second-order transition temperature curve of the material. Within 20 to 60 ms (milliseconds), the surface of the paper web (1) leaving the nip (3) first undergoes a transition step in a cooling device (4) in combination with a change in moisture content to a state below the second-order transition point of the material. The surface can be cooled by contact with a chilled surface (8) or by direct contact with a cooling, preferably inert gas. The increase in roughness of the paper web (1) after glazing is thereby reduced, so that the surface quality attained in the nip (3) remains essentially constant. Devices for implementing the process are disclosed.
IPC 1-7
IPC 8 full level
D21G 1/00 (2006.01)
CPC (source: EP US)
B30B 15/34 (2013.01 - EP); D21G 1/0093 (2013.01 - EP US)
Designated contracting state (EPC)
FR GB
DOCDB simple family (publication)
WO 9007027 A1 19900628; DE 3922184 A1 19900628; DE 3922184 C2 19911002; EP 0449841 A1 19911009; EP 0449841 B1 19930310; FI 912666 A0 19910603; FI 95939 B 19951229; FI 95939 C 19960410; JP 2755758 B2 19980525; JP H04502182 A 19920416; US 5245920 A 19930921
DOCDB simple family (application)
DE 8900701 W 19891107; DE 3922184 A 19890706; EP 89912220 A 19891107; FI 912666 A 19910603; JP 51134389 A 19891107; US 69101091 A 19910620