Unlock instant, AI-driven research and patent intelligence for your innovation.

Colour difference control technology of for producing colour paper

A color paper and color difference technology, applied in papermaking, textile and papermaking, pulp raw material addition process, etc., can solve the problems of uneven color depth and large fluctuation range of color difference, achieve consistent color depth, uniform color, and avoid production and waste. Effect

Inactive Publication Date: 2006-02-22
SHANDONG BOHUI PAPER INDUSTRY CO LTD
View PDF1 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a color difference control process for the production of colored paper, which solves the problems of large fluctuation range of color difference and uneven color depth in the production of colored paper by adopting a simple control process

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1 Adopt intermittent pulping and dyeing method to produce light green writing and printing paper, first press straw pulp (hardness≤600ppm, residual chlorine≤0.004g / L, whiteness 76±2%), wood pulp and damaged pulp through pulping, After beating, mix the pulp according to the weight ratio of 70% of straw pulp, 15% of wood pulp and 15% of damaged pulp. A compound dye made of two dyes, the same compound dye is also added to the recycled white water system, and the concentration of the dye added to the white water used in the first pool is 1.2 times the dye concentration in the slurry. In the process of paper machine papermaking, talcum powder is used as filler, and the filler is added on the pipeline behind the high-level box, and then the color whiteness meter is used to monitor the whiteness difference of the colored paper being made. When the fluctuation range of the whiteness difference exceeds ±1% , adjust the amount of paper-making filler talcum powder to ma...

Embodiment 2

[0015] Example 2 The continuous dyeing method is used to produce light yellow web paper, the weight ratio of the pulp is: straw pulp 70%, wood pulp 15%, damaged pulp 15%, the hardness of the straw pulp is ≤550ppm, and the residual chlorine is ≤0.0035g / L, the whiteness is 76±1%. The added compound dye is made up of two dyes: direct frozen yellow of 0.4 / 10000 dry pulp amount and basic bright yellow of 3.6 / 100000 dry pulp amount. In the process of paper machine papermaking, talcum powder is used as filler, and the filler is added on the pipeline behind the high-level box, and then the color whiteness meter is used to monitor the whiteness difference of the colored paper being made. When the fluctuation range of the whiteness difference exceeds ±1% , adjust the amount of paper-making filler talcum powder to maintain a constant whiteness difference within ±1%. When the whiteness is high, reduce the amount of paper-making fillers. When the whiteness is low, increase the amount of p...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A color difference controlling technology for making color paper includes such steps as proportionally mixing strew pulp with wooden pulp, adding size and dye proportionally, forming paper while measuring the whiteness of color paper, and regulating the quantity of addition to make the difference in whiteness within + / -1%.

Description

technical field [0001] The invention belongs to the technical field of methods for controlling the addition of substances to pulp or paper during the papermaking process, and in particular relates to a process for controlling the color difference of colored paper by controlling the whiteness and the continuous addition of fillers. Background technique [0002] In recent years, the market demand for colored paper in cultural paper has been increasing year by year, because colored paper can prevent readers from myopia on the one hand, and on the other hand meet the needs of publishers to prevent piracy and increase the beauty of books to expand sales. The dyeing mechanism of papermaking is: adding selected dyes to the pulp to selectively absorb most of the spectrum of visible light, and the spectrum that is not absorbed but reflected is the observed color of the paper. Among them, the wavelength range of yellow is the shortest, which is 565-585nm, so it is more difficult to co...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): D21H17/67D21H23/06
Inventor 陈商
Owner SHANDONG BOHUI PAPER INDUSTRY CO LTD