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Hue adjusting process for high-whiteness coating white cardboard

A white cloth cardboard, high whiteness technology, applied in the field of hue adjustment process of high whiteness coated white cardboard, can solve the problems of difficult wastewater treatment, narrow control range, long adjustment time, etc., to achieve the difficulty of wastewater treatment The effect of reducing and reducing production costs and adjusting time is fast

Active Publication Date: 2012-06-27
ZHUHAI S E Z HONGTA RENHENG PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, there are many adjustment points for adjusting the hue, the adjustment time is long and chaotic, and the hue of the finished paper is unstable; on the other hand, due to the low sizing concentration of each layer of slurry, the added whitening agent is easy to flow into the white water, and the consumption of whitening agent is large , and cause high whitening agent content in wastewater, wastewater treatment is difficult, and treatment costs are high
At the same time, the content of whitening agent in the white water system is relatively large. When this kind of paper is changed to other white cardboard after production, it is necessary to produce transitional base paper or stop cleaning before changing to other papers. It is difficult to change production and the production cost is high.
[0004] The whiteness and hue indicators of a high-whiteness coated white cardboard are: front side whiteness 90.0-93.0%, reverse side whiteness 99.0-103.0%, front side hue: L*=94.0 + 2.0, a*=0.45 + 0.80, b*=-3.60 + 0.90, negative hue: L*=94.0 + 2.0, a*=1.90 + 0.80, b*=-10.50 + 1.20, when producing this kind of coated white cardboard, even if the whiteness of the same batch changes by 0.5%, it is a large fluctuation; for the hue: the reverse side a* value, b* value control range is narrow, adjusting a small amount of dye will also make the finished product Unqualified paper hue

Method used

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  • Hue adjusting process for high-whiteness coating white cardboard

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A process for adjusting the hue of high-whiteness coated white cardboard, comprising the steps of:

[0020] 1. Raw paper production:

[0021] Face paper layer: the face paste made by beating and batching goes through the head box, enters the headbox, and is sent to the face net to form the face paper layer;

[0022] Core paper layer: The core pulp made by beating and batching enters the headbox and is sent to the core wire to form the core paper layer through the head box. 5wt% violet aqueous solution is pumped into the head box at a flow rate of 10.4 L / h, wherein the amount of blue dye is 0.05kg / ton of paper, and the amount of violet is 0.08kg / ton of paper;

[0023] Bottom paper layer: The bottom pulp made by beating and batching goes through the head box and enters the headbox to be sent to the bottom wire to form the bottom paper layer;

[0024] The surface paper layer, the core paper layer and the bottom paper layer are copied to obtain the base paper;

[0025] 2...

Embodiment 2

[0029] A process for adjusting the hue of high-whiteness coated white cardboard, comprising the steps of:

[0030] 1. Raw paper production:

[0031] Face paper layer: the face paste made by beating and batching goes through the head box, enters the headbox, and is sent to the face net to form the face paper layer;

[0032] Core paper layer: The core pulp made by beating and batching enters the headbox and is sent to the core wire to form the core paper layer through the head box. 8wt% violet aqueous solution is pumped into the head box at a flow rate of 10.0 L / h, wherein the amount of blue dye is 0.07kg / ton of paper, and the amount of violet is 0.05 kg / ton of paper;

[0033] Bottom paper layer: The bottom pulp made by beating and batching goes through the head box and enters the headbox to be sent to the bottom wire to form the bottom paper layer;

[0034] The surface paper layer, the core paper layer and the bottom paper layer are copied to obtain the base paper;

[0035] ...

Embodiment 3

[0039] A process for adjusting the hue of high-whiteness coated white cardboard, comprising the steps of:

[0040] 1. Raw paper production:

[0041] Face paper layer: the face paste made by beating and batching goes through the head box, enters the headbox, and is sent to the face net to form the face paper layer;

[0042] Core paper layer: the core pulp made by beating and batching passes through the head box, enters the headbox and sends it to the core wire to form the core paper layer. Pump 4 wt% violet aqueous solution into the head box at a flow rate of 10.5 L / h, wherein, the amount of blue dye is 0.12kg / ton of paper, and the amount of violet is 0.15kg / ton of paper;

[0043] Bottom paper layer: The bottom pulp made by beating and batching goes through the head box and enters the headbox to be sent to the bottom wire to form the bottom paper layer;

[0044] The surface paper layer, the core paper layer and the bottom paper layer are copied to obtain the base paper;

[0...

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Abstract

The invention discloses a hue adjusting process for a high-whiteness coating white cardboard. An adding point of dye is selected at a head box through which core pulp passes; an adding point of a fluorescent whitening agent is selected at a feeding trough of which the surface is sized. According to the hue adjusting process disclosed by the invention, the dye and the whitening agent are separately added; when the hue is adjusted, control points are few and the adjusting time of the whiteness and the hue is short; and the adjusted finished paper not only meets the whiteness standard, but also achieves stable and uniform effects of the hue. According to the hue adjusting process disclosed by the invention, the consumption of the dye and the whitening agent is reduced and the quantity of the whitening agent in white water is little, so that the cost is reduced and the difficulty in wastewater treatment is reduced.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and relates to a hue adjustment process of high-whiteness coated white cardboard. Background technique [0002] The whiteness and color of coated white cardboard have a great influence on printing. The same batch of paper is produced, and the whiteness and hue requirements are consistent. Therefore, the control of paper whiteness and hue is a key point in the production process, especially for high whiteness. High-degree coated white cardboard, when the whiteness of the front side is 90.0-93.0%, and the whiteness of the back side is 99-103.0%, it is difficult to control and ensure the whiteness and hue stability of the high-whiteness coated white cardboard. Most manufacturers use a color whiteness meter to test their hue indicators: L* value, a* value, b* value, compare the hue indicators of coated white cardboard at each time period, judge whether the hue is consistent, and then adjust accor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H23/14D21H21/28D21H21/30
Inventor 黄欣仇如全张东生刘丽图刘海滨余军生杨丽卢诗强
Owner ZHUHAI S E Z HONGTA RENHENG PAPER
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