Method for manufacturing a multi-layered paperboard, multi-layered paperboard and composition for use in multi-layered paperboard manufacturing

一种多层纸板、组合物的技术，应用在造纸、造纸机、纺织品和造纸等方向，能够解决增加干燥能力、延迟、慢机器速度等问题，达到消耗低的效果

Active Publication Date: 2020-10-13
KEMIRA OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, delays and high temperatures require increased drying capacity and slower machine speeds, which are undesirable from an efficiency and cost standpoint for plyboard manufacturing

Method used

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  • Method for manufacturing a multi-layered paperboard, multi-layered paperboard and composition for use in multi-layered paperboard manufacturing
  • Method for manufacturing a multi-layered paperboard, multi-layered paperboard and composition for use in multi-layered paperboard manufacturing
  • Method for manufacturing a multi-layered paperboard, multi-layered paperboard and composition for use in multi-layered paperboard manufacturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] This example simulates the preparation of multi-layer paperboard, such as liner board, white-lined particle board or core board. Test panels were made using a Formette-Dynamic Toilet Paper Sheet Forming Machine manufactured by Techpap.

[0067] A test fiber stock was prepared to simulate recycled fiber. Central European testliner board was used as raw material. The test liner contained about 17% ash and 5% surface size starch. through CaCl 2 Ca 2+The concentration was adjusted to 520 mg / L and the conductivity was adjusted to 4 mS / cm with NaCl. Dilution water was made from tap water. The test liners were cut into 2 x 2 cm squares. Heat 2.7L of dilution water to 70°C. The test liner pieces were wetted in 2% dilution water for 10 minutes prior to disintegration. The slurry was disintegrated in a Britt jar crusher at 30,000 rpm. The slurry was diluted to 0.6% by adding dilution water. Test chemicals were prepared according to Table 1.

[0068] The test fiber stock...

Embodiment 2

[0082] In this example, optical microscope images (1 mm wide, 0.1 mm high) were taken from transversely sliced ​​plates stained with iodine solution. figure 1 presents a microscope image of a multilayer paperboard in which an aqueous composition according to the invention has been applied between the layers, and figure 2 A reference microscope image of a multi-ply paperboard in which an aqueous solution of granular starch has been applied between the plies is presented. These images include the middle and back laminates of the multi-ply board. The back laminate (line side) of the plyboard is the bottom side in the picture. Bond lines between the middle laminate and the back laminate are indicated by arrows in the figure. The top ply and back ply pulp was bleached kraft pulp refined to SR 25, while the middle ply pulp was bleached CTMP refined to 440 mL CSF, and the waste paper was obtained from folded cardboard veneer Disassembled above, which corresponds to the furnish fo...

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Abstract

A method for manufacturing a multi-layered paperboard, which comprises at least two fibrous layers, in which method at least one layer of the multi-layered paperboard is treated by applying an aqueoussolution of a first strength component in dissolved form comprising anionic strength polymer and / or amphoteric strength polymer composition on a surface of layer, and an aqueous solution of a cationic second strength component in dissolved form is added to the fibre stock from which at least one of the fibrous layers joined together is formed.

Description

technical field [0001] The present invention relates to a method for manufacturing a multi-layered paperboard and a multi-layered paperboard according to the preambles of the independent claims described below. The present invention also relates to aqueous compositions for improving the z-direction tensile strength of multi-ply boards. Background technique [0002] Multi-ply or ply paperboard comprises at least two plies that are joined together during manufacture. The multilayer structure has the advantage of being able to optimize, for example, the properties of the fibers in the different layers to achieve a certain function. This can be achieved, for example, by varying the content and quality of fiber stock in each layer. [0003] Internal bond strength, usually expressed in z-direction tensile strength, is an important factor for multilayer boards, as it determines, for example, the processability of the board during printing and / or after coating, and performance in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H23/50D21H27/32D21H17/37D21H17/25D21H17/28D21H17/29D21H17/42D21H17/44D21H21/18D21H23/28
CPCD21H17/25D21H17/28D21H17/29D21H17/375D21H17/42D21H17/44D21H21/18D21H23/28D21H23/50D21H27/32D21H27/38D21H5/0047D21F11/04D21H17/26D21H17/45D21H23/72D21H27/36
Inventor 马蒂·希耶塔涅米
Owner KEMIRA OY
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