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.
Abstract:
An embossed paper (10), wherein the paper is a highly extensible Kraft paper (10null) and wherein discrete bosses (14) and/or depressions (12) consist of portions of said paper stretched at a dry content of 50-95% is disclosed. A two, three or multi-layer paperboard comprising at least one layer of the embossed and/or depressed paper (10) is also disclosed. Thus, the embossed paper may be used as such or instead of fluted paper in a corrugated board. The disclosed paperboard is easily creased and folded in both major directions, and in other direction as well. Method of producing the embossed paper (10) and a method or producing a two, three or multi-layer paperboard comprising at least one layer of the embossed and/or depressed paper (10) are also described.
Abstract:
For the production of a sheet product including at least two layers (V1, V2) it is suggested, among other things, an embossing device including a first pressure roller (5; 105) interacting with a first and a second embossing cylinder (1, 3; 101, 103) provided with respective points (1P, 3P; 101P, 103P) on their cylindrical surface.
Abstract:
The invention concerns a process for producing corrugated board, wherein a biopolymer latex adhesive is used as the corrugating adhesive. The biopolymer latex adhesive can be obtained by extruding a plasticized biopolymer, especially starch, in the presence of a crosslinking agent such as glyoxal. The preparation of the latex adhesive and its application in corrugating operation do not require a gelatinization step, nor the use of caustic soda or borax.