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A preparation method of coated paper with reduced thickness loss

A technology of thickness loss and coated paper, which is applied in the field of papermaking, can solve the problems of increasing the difficulty of processing technology, high thickness of coated paper, and increase of mechanical energy consumption, so as to achieve the reduction of thickness loss rate, increase of bulk thickness and increase of thickness loss. Effect

Active Publication Date: 2021-11-30
HAINAN JINHAI PULP & PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When producing bright copper paper above 170gsm, generally only 8 nips can be used, that is, Janus Mode, and 4 nips of Stack1 and 4 nips of Stack2 are used at the same time, but there is often a large thickness loss, and the thickness of the coated paper needs to be thick. High, large amount of pulp used, which is not conducive to cost reduction
At present, in order to further reduce the loss of matt paper, it is usually by adjusting the process parameters such as the linear pressure of each nip, but it will increase the operation difficulty of the processing technology, increase the mechanical energy consumption, and the reduction of the loss of calendered paper thickness has certain limitations. Therefore, At present, it is impossible to minimize the thickness loss of bright copper paper above 170gsm and increase the bulk of calendered paper while saving unnecessary energy loss

Method used

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  • A preparation method of coated paper with reduced thickness loss
  • A preparation method of coated paper with reduced thickness loss

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1-a kind of preparation method of the coated paper that reduces thickness loss, comprises the steps of preparing mixed pulp, papermaking molding, pre-drying, 3 times of sizing, 4 times of coating and calendering;

[0026] In the step of preparing mixed pulp: adjust the pulp components by weight percentage: 25% NBKP, 50% LBKP and 25% BCTMP; the freeness of the slurry after beating is: NBKP 450ml, LBKP 410ml, BCTMP 300ml;

[0027] In the papermaking forming step: papermaking is carried out in the wire part, the concentration of the slurry on the net is 0.6%, the wire speed is 900m / min, the paper sheet is formed and dehydrated in the wire part, the dehydration amount is 30%, the base paper for papermaking is 123gsm, and the base paper is 123gsm. Ash content is 16%;

[0028] In the step of pre-drying: the wet paper sheet formed by copying is sent to the drying section for pre-drying until the moisture content of the paper sheet is 5%;

[0029] In the sizing step...

Embodiment 2

[0032] Embodiment 2-a kind of preparation method of the coated paper that reduces thickness loss, comprises the steps of preparing mixed pulp, papermaking molding, pre-drying, 3 times of sizing, 4 times of coating and calendering;

[0033] In the step of preparing mixed pulp: by weight percentage, the pulp components are adjusted to be: 15% kraft softwood pulp, 55% bleached kraft hardwood pulp and 30% bleached chemical thermomechanical pulp; the freeness of pulp after beating For: 350ml of kraft softwood pulp, 430ml of bleached kraft hardwood pulp, 350ml of bleached chemical thermomechanical pulp;

[0034] In the papermaking forming step: papermaking is carried out in the wire part, the concentration of the slurry on the net is 0.7%, the wire speed is 1000m / min, the paper sheet is formed and dehydrated in the wire part, the dehydration amount is 35%, the papermaking base paper is 123gsm, Ash content is 17%;

[0035] In the step of pre-drying: the wet paper sheet formed by cop...

Embodiment 3

[0041] Embodiment 3-a kind of preparation method of the coated paper that reduces thickness loss, comprises the steps of preparing mixed pulp, papermaking molding, pre-drying, 3 times of sizing, 4 times of coating and calendering;

[0042] In the step of preparing mixed pulp: by weight percentage, the pulp components are adjusted to be: 20% kraft softwood pulp, 55% bleached kraft hardwood pulp and 25% bleached chemical thermomechanical pulp, the freeness of pulp after beating For: 400ml of kraft softwood pulp, 420ml of bleached kraft hardwood pulp and 320ml of bleached chemical thermomechanical pulp;

[0043] In the papermaking forming step: papermaking is carried out at the net part, the concentration of the slurry on the net is 0.65%, the net speed is 950m / min, the paper sheet is formed and dehydrated at the net part, the dehydration amount is 32%, the base paper for papermaking is 123gsm, and the base paper is 123gsm. Ash content is 16.5%;

[0044] In the step of pre-dryin...

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Abstract

The invention provides a method for preparing coated paper with reduced thickness loss, which includes the steps of preparing mixed pulp, papermaking and molding, pre-drying, 3 times of sizing, 4 times of coating and calendering, and the pulp components are adjusted to: 15-25 %NBKP, 50-60% LBKP and 20-30% BCTMP; the freeness of pulp after beating is: NBKP 350-450ml, LBKP 410-430ml, BCTMP 300-350ml; before drying to 5-6% paper moisture ; Carry out 4 times of coating after 3 times of sizing, adopt 6 nips mode, use 3 nips of Stack1 and 3 nips of Stack2, and calender to obtain finished coated paper. The present invention realizes changing the mode of 8 nips into the mode of 6 nips, reduces the thickness loss of calendered paper to the greatest extent and increases the bulkiness of calendered paper, saves energy consumption, and the gloss and roughness of calendered paper can both reach the standard .

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a method for preparing coated paper with reduced thickness loss. Background technique [0002] So far, the Voith Janus Calender MK2 2×5 calender mainly adopts segmented calendering. Usually, stack 1 is mainly used to improve the physical properties of the upper surface, and Stack 2 is mainly used to improve the physical properties of the lower surface. When producing bright copper paper above 170gsm, generally only 8 nips can be used, that is, Janus Mode, and 4 nips of Stack1 and 4 nips of Stack2 are used at the same time, but there is often a large thickness loss, and the thickness of the coated paper needs to be thick. High, the amount of pulp used is large, which is not conducive to the problem of cost reduction. At present, in order to further reduce the loss of matt paper, it is usually by adjusting the process parameters such as the linear pressure of each nip, but it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H27/00D21H11/04D21H11/02D21H21/16D21H23/72D21H23/58D21H19/40D21H19/38D21H19/44D21H19/84D21H19/82
CPCD21H11/02D21H11/04D21H19/385D21H19/40D21H19/44D21H19/822D21H19/84D21H21/16D21H23/58D21H23/72D21H27/00
Inventor 阳四东
Owner HAINAN JINHAI PULP & PAPER