CN101182693B - Method capable of stabilizing paper stuff whiteness - Google Patents

Abstract

A method to stabilize the paper pulp brightness belongs to the pulp and paper making technical field. By adding the diethylenetriamine pentaacetic acid into a front pulp grinding chest, a white water chest and a pulp mixing chest of an alkaline peroxide mechanical pulp respectively, metallic ions in the system are concealed to reach the purpose of stabilizing the color and luster of the alkaline peroxide mechanical pulp(APMP pulp), promote the brightening efficiency of a brightening agent which is added subsequently, keep the original color and luster of the pulp, and reduce the amount of the brightening agent added subsequently. With the method, the brightness of the finished paper reaches over 80 degrees SR, the brightening efficiency of the brightening agent added subsequently is promoted, and the amount of the brightening agent used is reduced. The finished product is provided with the bright color and luster, and the smooth feeling, and can meet the requirement of printing, so the grade of the finished paper is promoted. Moreover, the working efficiency is promoted, the production cost is reduced, and the energy is saved.

Description

A kind of method of stable pulp brightness

Technical field

The present invention relates to pulp and paper technology, specifically is the method that is used for stablizing the whiteness of paper grade (stock) slurry, especially the APMP slurry.

Background technology

The APMP slurry is a paper making raw material commonly used at present, the APMP slurry needs through the fiberizer processing of pulling an oar before the papermaking, because the grinding stone of used fiberizer is a metal material, do not add any chemicals in the slurry before the making beating, influence owing to metal ion after causing the APMP slurry through the fiberizer making beating causes pulp brightness decline 4-5 degree, the color and luster of APMP slurry changes greatly before and after the making beating, the making beating disposed slurry has lost soft faint yellow of magma, and the color and luster that becomes is dim and show slightly red, become the dark red whiteness of paper color and luster to reduce the 5-10 degree, for the amount ratio that is held in brightening agent in the paper whiteness subsequent handling increased 25%-60% originally.

Do not add any chemicals before the making beating of original method, be subjected to metal ion to influence slurry color and luster deepening, rubescent, increased the addition and the presentation quality that becomes paper of the brightening agent of subsequent handling, the whiteness that wants to make into paper reaches 80 ° more than the SR, adopts this kind technology to reach.

Summary of the invention

In order to overcome the shortcoming that above-mentioned prior art exists, the object of the present invention is to provide a kind of method of stable pulp brightness, it can stablize the whiteness of APMP slurry, improved the efficient that brightens of the brightening agent that adds in the subsequent handling, reduced the use amount of brightening agent, make into the paper lovely luster, bright, feel is fine and smooth, can satisfy the requirement of printing.

Technical scheme of the present invention is: a kind of method of stable pulp brightness is characterized in that:

1) earlier a certain amount of emulsion form diethylene triamine pentacetic acid (DTPA) is joined in the retort;

2) add clear water then in retort, stirring and making concentration is 1% diethylene triamine pentacetic acid (DTPA) solution;

3) stir after 30 minutes, diethylene triamine pentacetic acid (DTPA) solution is input in the finished product jar;

4) the diethylene triamine pentacetic acid (DTPA) solution in the finished product jar being joined Alkaline Peroxide Mechanical Pulp respectively kowtows forebay, white water chest, joins in the stock tank; Addition is: Alkaline Peroxide Mechanical Pulp is kowtowed paper pulp adding 350L per ton in the forebay; Paper pulp per ton adds 200L in the white water chest, joins paper pulp adding 100L per ton in the stock tank.

By adding the metal ion that diethylene triamine pentacetic acid (DTPA) (DTPA) exists in can masking system, reach the purpose of stable Alkaline Peroxide Mechanical Pulp (APMP slurry) color and luster, improve follow-up interpolation brightening agent brighten efficient.

The invention has the beneficial effects as follows: it can stablize the whiteness that APMP starches by adding DTPA, keep original color and luster of slurry and brightness, the brightening agent that also can reduce subsequent handling simultaneously adds, become the paper whiteness to reach 80 ° more than the SR, improved the efficient that brightens of the brightening agent that adds in the subsequent handling, reduced the use amount of brightening agent, make into the paper lovely luster, bright, feel is fine and smooth, can satisfy the requirement of printing, improve the class that becomes paper; Also improve production efficiency, reduced production cost, saved the energy.

Result of the test is seen attached list:

	Before adding DTPA	Add before and after the DTPA
			The whiteness (ISO) of APMP slurry before the making beating	73.5	73.5
The whiteness (ISO) of making beating back APMP slurry	67.8	73.0
			Brightening agent consumption (Kg/T slurry)	25.0	20.0
Become paper whiteness (ISO)	74.0	80.0
			Become the paper outward appearance	Darker in color and show slightly red	Bright in colour bright

The specific embodiment

Should stablize the method for pulp brightness, may further comprise the steps:

1) elder generation joins 2.0m with the emulsion form diethylene triamine pentacetic acid (DTPA) (that is: DTPA) of 18Kg ³In the retort;

2) in retort, add 1.8m then ³Clear water, stirring and making concentration is 1% diethylene triamine pentacetic acid (DTPA) solution;

3) stir after 30 minutes, diethylene triamine pentacetic acid (DTPA) solution is input in the finished product jar;

4) the diethylene triamine pentacetic acid (DTPA) solution in the finished product jar being joined the APMP slurry respectively kowtows forebay, white water chest, joins in the stock tank; Addition is: APMP (alkaline peroxide mechanical pulp) slurry is kowtowed paper pulp adding 350L per ton in the forebay; Paper pulp per ton adds 200L in the white water chest, joins paper pulp adding 100L per ton in the stock tank.

The present invention is not limited only to above-mentioned embodiment.

Claims (1)

1. the method for a stable pulp brightness is characterized in that:

1) earlier a certain amount of emulsion form diethylene triamine pentacetic acid (DTPA) is joined in the retort;

2) add clear water then in retort, stirring and making concentration is 1% diethylene triamine pentacetic acid (DTPA) solution;

3) stir after 30 minutes, diethylene triamine pentacetic acid (DTPA) solution is input in the finished product jar;

4) the diethylene triamine pentacetic acid (DTPA) solution in the finished product jar being joined Alkaline Peroxide Mechanical Pulp respectively kowtows forebay, white water chest, joins in the stock tank; Addition is: Alkaline Peroxide Mechanical Pulp is kowtowed paper pulp adding 350L per ton in the forebay; Paper pulp per ton adds 200L in the white water chest, joins paper pulp adding 100L per ton in the stock tank.