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Method and apparatus for making a multilayer coating

A coating and coating layer technology, which is applied in the rearrangement of coating materials, papermaking, coating, etc., can solve the problems of high product prices and increase of final prices, and achieve investment and raw material cost savings and reduce damage pressure Danger of bare rolls, effect of short machine length

Inactive Publication Date: 2007-06-20
METSO PAPER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the price of the product becomes higher, and while mechanical pulp and recycled fiber are generally more cost-effective compared to chemical pulp, all the extra fiber / pulp needed in production adds to the final price of the product

Method used

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  • Method and apparatus for making a multilayer coating

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Embodiment Construction

[0034] In the following, the terms coating and coating formulations must be understood as meaning all methods and formulations in which mixtures comprising pigmented materials are used for the treatment of webs. In addition to these ingredients, the term web treatment agent is used when the broader reference also covers other ingredients used in web treatment such as surface sizing.

[0035]Referring to Figure 1, there is shown a coater layout for making paper coated on both sides by two-layer coating. Although, this coater layout can be very advantageously used to set up an in-line system with a paper machine, it is also suitable to work as an off-line coater combined with an unwinder.

[0036] In this arrangement, the first unit is the pre-calender 2, in which the surface of the web is smoothed for later processing. The pre-calender may be a machine calender, soft-nip calender or other type of calender capable of producing a suitable web surface smoothness. Aspects to cons...

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PUM

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Abstract

A method and assemby is disclosed for manufacturing a two-layer coated paper web, the method comprising the steps of applying a coating furnish layer to at least one surface of said paper web, drying the applied coating furnish layer to a point allowing a next coating layer to be applied thereon. Onto the first coating layer is applied a second coating layer that is dried. The application of successive coating layers is continued until the desired coat thickness is attained. The coating layers are applied using a metering film transfer method operating without leveling of the applied coating layer by doctoring, whereby in at least one of said coating layers is used a furnish having a solids content of not less than 62%.

Description

technical field [0001] The invention relates to a method for applying a multilayer coating to the surface of paper. Background technique [0002] The term fine paper is used when referring to a base web made of chemical pulp only or a product containing no more than 30% mechanical pulp. In order to improve its printability, the surface of the web is treated in different ways. The most important surface treatment processes are calendering and coating. The smoothest surface, which usually also gives the best printing results, is obtained by making at least the topmost coating layer by a knife coater. In doctor blade coating, the coating mix layer applied to the surface of the web is smoothed by scraping with a doctor blade. In the manufacture of fine paper grades, multi-layer coatings are applied and the blade coating method is used, wherein the coating is applied using applicator rolls, short-dwell applicators or spray applicators. The coating is applied as an aqueous fur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H23/56D21H19/82D21H19/84D21H23/30D21H25/14
CPCD21H25/14D21H19/82D21H23/30D21H23/56D21H19/84
Inventor S·福尔斯J·格伦P·劳蒂埃宁T·埃斯科拉
Owner METSO PAPER INC
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