Supercalender

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Supercalender

 

a machine for finishing paper—that is, increasing its surface smoothness, giving it luster and stiffness, and embossing it.

A supercalender consists of six to 12 metal and paper rolls, between which the paper web is threaded. The metal rolls are made of polished cast iron. The paper rolls are made by compressing paper disks stacked onto a steel core at pressures up to 45 meganewtons per sq m, or 450 kilograms-force per sq cm, after which the rolls are finished by turning and polishing. The Shore hardness of paper rolls used to calender printing papers is 36–40; the linear pressures produced in the finishing process are 100–350 kilograms-force per sq cm. The paper web travels through a supercalender at speeds of up to 900 m/min. Idler rolls, which reduce the tension on the paper in the calendering section, are used to prevent the paper from tearing in the machine.

Supercalenders are used primarily to finish printing and writing papers.

REFERENCE

Eidlin, I. Ia. Bumagodelatel’nye i otdelochnye mashiny, 3rd. ed. Moscow, 1970.

G. A. IVANOV

References in periodicals archive ?
Supercalendering has still been performed in a separate operation because the filled roll covers on supercalenders cannot stand the abuse that they would receive if located before the reel of the paper machine.
The final step, then, was to develop on-machine supercalenders with polymeric roll covers.
Voith has also supplied on-line 8-roll supercalenders (with no center gap), which were used for conversion of two newsprint machines to LWC at Madison Paper and Bowater in the United States.
The rebuild will improve the quality of the magazine paper by rebuilding its wet end including the wire section and new headbox and adding a new profile system to the supercalenders.
This fact, combined with the use of supercalenders in many LWC mills, leaves few options for matte production.
Samples were calendered with a Beloit sheet-fed laboratory supercalender to dual gloss targets of 25 and 30.
The rebuild of PM5 involves the wet end, the press section, and the supercalenders.
Marie, Ontario, Canada, has successfully started up three Metso Paper supercalenders alter rebuilding them with OptiLoad technology.
It has been installed in press sections, machine calenders and supercalenders for the last four decades and recently in soft nip calenders.
A higher-hulk grade such as 250-85-100 HB is generally not recommended in this application because older style supercalenders tend to pound and densify the sheet as it passes through multiple nips, which collapses the thin aspen fiber walls.