Method of producing paperboard product with an even thickness
First Claim
1. A method for producing a printable paperboard product comprising at least three layers, in which method paperboard raw material webs forming the layers of the product are bonded to each other by gluing, characterized in thatat least one of the webs is worked mechanically in a dry state, when the moisture content of the web is not greater than 12%, by embossing thereon a raised pattern so as to deform the web surface in a permanent manner,at least two of the webs are planar unworked webs,glue is applied between adjacent webs, andthe unworked webs are bonded to the at least one embossed web after the application of the glue in a bonding and calibration nip, wherein the webs are pressed against each other so as to calibrate the thickness of the bonded webs and provide the printable paperboard product having an even thickness.
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Accused Products
Abstract
A method is disclosed for producing a multilayer paperboard product, as well as an assembly suited for implementing the method and a paperboard manufactured according to the method, whereby the paperboard is made from at least two, advantageously three layers (4, 5, 6) bonded to each other by gluing, and the material of the middle layer (5) is subjected to mechanical working in a dry state (8) so as to deform the material prior to gluing through pressing thereon desired pattern that is raised from the surface of the material (5). The layers (4, 5, 6) are bonded to each other in a single step (7). The method is capable of providing a strong paperboard that uses less fiber than prior-art paperboards of equal thickness and strength.
20 Citations
10 Claims
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1. A method for producing a printable paperboard product comprising at least three layers, in which method paperboard raw material webs forming the layers of the product are bonded to each other by gluing, characterized in that
at least one of the webs is worked mechanically in a dry state, when the moisture content of the web is not greater than 12%, by embossing thereon a raised pattern so as to deform the web surface in a permanent manner, at least two of the webs are planar unworked webs, glue is applied between adjacent webs, and the unworked webs are bonded to the at least one embossed web after the application of the glue in a bonding and calibration nip, wherein the webs are pressed against each other so as to calibrate the thickness of the bonded webs and provide the printable paperboard product having an even thickness.
Specification