Method and apparatus for producing board and a board product
First Claim
1. Method for producing a paperboard product comprising at least two layers, in which method paperboard raw material webs (4, 5, 6) 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 by pressing thereon a raised pattern so as to deform the web surface in a permanent manner.
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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.
22 Citations
16 Claims
- 1. Method for producing a paperboard product comprising at least two layers, in which method paperboard raw material webs (4, 5, 6) 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 by pressing thereon a raised pattern so as to deform the web surface in a permanent manner.
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10. Assembly for producing a paperboard product comprising at least two layers, the assembly including
means (1, 2, 3) for passing at least two webs (4, 5, 6) into the assembly, and means (9) for treating one surface of at least one (4) of the webs by a glue for bonding said surface to another web (5), characterized by means (8) for working at least one (5) of the webs mechanically so as to form on the surface of said web permanent deformations, and a nip (7) for both pressing said webs (4, 5) against each other after the application of the glue and calibrating the thickness of the product thus obtained.
- 12. Paperboard product comprising at least two layers (4, 5) bonded to each other, one (4) of the layers being a planar web, characterized in that at least one (5) of said layers is worked mechanically so that on the surface of said layer is a three-dimensional pattern of permanent deformations.
Specification