A paper calendering device

Abstract

The invention relates to a novel paper calendaring device. Laser is adopted to serve as a heating source for paper sheets in the novel paper calendaring device. According to the novel paper calendaring device, the laser serves as the heating source for the paper sheets and heats surfaces of the paper sheets entering a calendaring area of a calender, an ideal temperature gradient is generated in the thickness direction of the paper sheets, then plastic deformation of the paper sheets after calendaring in the thickness direction is concentrated in the surfaces of the paper sheets, the bulk of the machined paper sheets is guaranteed furthest, the radiation type heating mode avoids thermal contact resistance between a heating surface and the surfaces of the paper sheets in traditional contact type heating, and accordingly the heat transfer efficiency is improved. The novel paper calendaring device is compact in structure, rapid in response and easy to control.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and relates to equipment for calendering operation in the papermaking process, in particular to a novel paper calendering device which uses laser heating to generate a temperature gradient in a paper web and then calenders. Background technique [0002] In the process of paper sheet processing, in order to improve the surface properties of the paper sheet, such as smoothness and gloss, and to improve the transverse thickness fluctuation of the paper web, it is often necessary to perform calendering operations on the paper. The calendering operation of paper is to deform the paper in its thickness direction by applying a certain pressure to the paper. When the pressure is removed, part of the paper deformation is restored, and the other part remains permanently. It is this part of the permanent deformation that improves the surface properties of the calendered paper and improves the transvers...

AI Technical Summary

Problems solved by technology

On the one hand, limited by the diameter of the calender roll, the length of the nip cannot be extended without limit; on the other hand, in the rather long area of ​​the entrance of the long nip, the paper sheet has not yet established an effective temperature gradient in its thickness direction It has already been calendered in the case of , so the temperature gradient calendering has not been able to give full play to its advantages

[0004] In addition, the existing traditional oil heating system used in calendering has the disadvantages of occupying a large area and slow heating and cooling of the system; moreover, the existing heating equipment for calendering uses heating rollers with complex structure and high cost, which increases investment and Cost of production

[0005] Through the search, no patent publications related to the patent application of the present invention have been found

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