Calender for smoothing a paper web

A calendering and leveling technology, which is applied in paper machines, calenders, papermaking, etc., can solve the problems of paper web surface keratinization, and achieve the effects of improving the leveling effect, improving heating, and good heat transfer

Inactive Publication Date: 2012-10-03
ANDRITZ KUESTERS GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High temperatures can cause horniness of the paper web surface, which has a detrimental effect on gravure printing...

Method used

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  • Calender for smoothing a paper web
  • Calender for smoothing a paper web
  • Calender for smoothing a paper web

Examples

Experimental program
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Embodiment Construction

[0019] The invention relates to a calender 1 for smoothing a paper web 2, which consists in particular of gravure-printable paper. figure 1 A calender according to a first exemplary embodiment is shown schematically with at least one roll stack having an upper end roll 4.1 and a lower end roll 4.2 and intermediate rolls 5.1, 5.2. With regard to the guidance of the paper web 2 in the running direction L, one of the two end rolls, here the upper end roll 4.1, delimits the first working gap 3 of the roll stack. The roll stack comprises a plurality of rolls 4.1, 4.2, 5.1, 5.2, which are designed as hard rolls 4.1, 5.2 and soft rolls 5.1, 4.2 to form a loadable working gap in the form of a soft roll nip. The end rolls 4.1 delimiting the first working gap 3 are hard, heatable rolls with a diameter greater than the diameter of the hard, heatable middle roll 5.2. The outer wall of the end roll 4 . 1 also forms a contact surface 10 of the web processing nip 8 arranged upstream of the ...

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Abstract

The invention relates to a calender (1) for smoothing a paper web (2), in particular made of paper capable of gravure printing, comprising at least one roller stack, each roller stack comprising an upper and a lower end roller (4.1, 4.2) and intermediate rollers (5.1, 5.2, 5.3, 5.4), wherein one of the two end rollers (4.1) bounds a first working gap (3) of the roller stack depending on the guiding of the paper web (2), and the rollers (4.1, 4.2, 5.1, 5.2, 5.3, 5.4) are hard rollers (4.1, 5.2, 5.4) and soft rollers (5.1, 5.3, 4.2) in order to form loadable working gaps in the form of soft nips, wherein the end roller (4.1) bounding the first working gap (3) is a hard, heatable roller, the diameter of which is greater than the diameter of a hard, heatable intermediate roller (5.2, 5.4) and the outer wall (9) of which forms one of two contact surfaces (9, 10) of a web treatment gap (8); arranged upstream of the first working gap (3), and the other contact surface is formed by a belt (14) circulating on guide rollers (11, 12, 13).

Description

technical field [0001] The invention relates to a calender according to the preamble of claim 1 for smoothing paper webs, in particular paper webs made of gravure-printable paper. Background technique [0002] To improve the surface quality, the paper web is leveled. Papers suitable for gravure printing are high-quality papers that require a particularly high finish. A calender for processing paper webs is known from EP 0886695 B1, which has a plurality of rolls between which a so-called soft nip is formed as a working gap between a hard roll and a soft roll. The multiple working gaps (roll nips) enable smoothing of the high-gloss values ​​that are decisive for a good printing result. [0003] However, when the machine is running at high speed on-line or off-line, a high temperature must be selected for this. High temperatures can cause keratinization of the paper web surface, which has a detrimental effect on gravure printing. In addition, at high temperatures, the roll...

Claims

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Application Information

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IPC IPC(8): D21G1/00
CPCD21G1/00D21G1/006
Inventor P.斯文卡B.布伦德尔E.达维丹科
Owner ANDRITZ KUESTERS GMBH & CO KG
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