CN102493264A

CN102493264A - Method of improving uniformity of paper sheets

Info

Publication number: CN102493264A
Application number: CN2011103886699A
Authority: CN
Inventors: 冯桂平; 曾金枝; 田中粟; 刘润福; 黄少斌
Original assignee: MCC Paper Yinhe Co Ltd
Current assignee: MCC Paper Yinhe Co Ltd
Priority date: 2011-11-30
Filing date: 2011-11-30
Publication date: 2012-06-13

Abstract

The invention discloses a method of improving uniformity of paper sheets, which is especially applicable to light-weight paper. According to the invention, carboxy methyl starch (CMS) is added into paper pulp, which alleviates dehydration of paper pulp at a wet end in the process of making of light-weight paper and prolongs a waterline, thereby improving uniformity of paper sheets, reducing difference between two surfaces of paper and enhancing the grade of finished paper.

Description

A kind of method that improves paper formation

Technical field

The present invention relates to pulp technology for making paper, a kind of specifically method that improves paper formation is particularly useful for light paper.

Background technology

Light paper is high because of its bulk, and deflection is big, no fluorescent whitening agent, and the printed matter weight made from it is lighter relatively, and article are on very good terms, and protect reader's eyes simultaneously, and are more and more welcome on market.And high yield pulp accounts for more than 70% in the slurry that light paper production is adopted, and has the characteristic of environmental protection low-carbon (LC), meets the notion of the current environmental protection low-carbon (LC) of vigorously advocating.But contain more lignin in the high yield pulp, the lignin poor water retention property, slurry is too fast in the wet end dehydration when causing light paper to be produced, and paper-forming evenness is poor.

At present; The measure that improves paper formation mainly is to set about (referring to Wang Qiuyun, Dong Rongye " corrective measure of formation of sheet " from change wet end furnish, adjustment online concentration, adjustment slurry network speed ratio, adjustment equipment; 2005 the 4th phases of papermaking chemical product; Referring to Yang Baijun " evenness of paper ", Chinese paper 2004 the 3rd phases of industry).Other has the evenness of improving page through interpolation PEO in slurry (referring to Yu Jinhong, Zhang Mei " research that PEO uses " in aramid fiber 1313 fiber page; 2006 the 2nd phases of Shanghai papermaking; Referring to " application of dispersant in tissue paper is produced ", 1997 the 1st phases of Guangdong papermaking).

The evenness that adopts said method to improve light paper has limitation, particularly adds dispersant such as PEO and improves paper formation and in light paper production, do not have effect at all.

CMS CMS is the chemicals a kind of commonly used in the papermaking, and its main application has three: one, as reinforcing agent, paper is played reinforced effects; The 2nd, as Cypres, have film forming and whole film transfer performance preferably; The 3rd, as water-retaining agent for coating, the rheological property that can improve coating well is (referring to Yang Daohua, Zhao Chuanshan " application study of sodium carboxymethyl starch ", 2010 4 phases of paper and papermaking; Referring to gold bead, Zhao Meiyun " research that different degree of substitution sodium carboxymethyl starch paper is strengthened the property ", 2005 the 4th phases of papermaking chemical product).Also be not utilized in the paper pulp and add CMS CMS, slowing down the dehydration of slurry, thereby improve the method for paper formation at wet end.

At present the light paper use amount constantly increases, and causes in the process of manufacturing paper with pulp the wet end dehydration too fast but contain more lignin in the slurry that uses because of light paper, influences paper formation.Therefore, wet end dewatering speed when slowing down light paper and manufacturing paper with pulp prolongs waterline, is very important thereby improve paper formation.

Summary of the invention

The objective of the invention is provides a kind of method of slowing down the dehydration of paper car wet end, improving the light paper paper formation to the too fast problem of wet end dehydration in the light paper production process.

Technical scheme of the present invention is: a kind of method that improves paper formation, it is characterized in that, and through in paper pulp, adding CMS (CMS) solution, slow down when manufacturing paper with pulp dehydration, thereby reach the purpose that improves paper formation at wet end.This method is particularly useful for light paper.The concrete operations step is following:

1) in retort, adds a certain amount of clear water earlier, start stirring;

2) add powdery CMS (CMS) while stirring, in retort, continue to add clear water then, stirring and making mass percentage concentration is 0.5% CMS (CMS) solution;

3) continue to stir after 30 minutes, CMS (CMS) solution is input in the finished product jar;

4) CMS in the finished product jar (CMS) solution is joined join in the stock tank; Addition is: paper pulp per ton adds 300L～500L CMS (CMS) solution.

The invention has the beneficial effects as follows: in the dehydration of wet end, prolong waterline when manufacturing paper with pulp through in paper pulp, adding CMS (CMS), slowing down light paper, thereby reach the evenness that improves page, the two sides that has reduced paper is poor, has improved the class that becomes paper.

The present invention compares test in Zhongye Paper Yinhe Co., Ltd.; Join stock tank before the transformation and do not add CMS (CMS); Transform the back and add CMS (CMS) (operating procedure is with embodiment 1); All the other process operations steps and raw materials used and material quantity is identical, its result is as shown in table 1.

Before and after improving, table 1 joins the result of the test that stock tank adds CMS

	Before adding CMS	After adding CMS
			CPAM consumption (Kg/t slurry)	0.30	0.30
APAM consumption (Kg/t slurry)	0.32	0.32
			Slurry one way retention (%)	72	77
Formation value	14	20
			Smoothness (s)	9/12	12/15

Annotate: CPAM is a PAMC, and APAM is a PAMA, and the addition of CPAM and APAM is in oven dry stock.

The specific embodiment

Embodiment 1:

1) in retort, adds a certain amount of clear water earlier, start stirring;

4) CMS in the finished product jar (CMS) solution is joined join in the stock tank, paper pulp per ton adds 400L CMS (CMS) solution.

Claims

1. a method that improves paper formation is characterized in that, through in paper pulp, adding carboxymethyl starch soln, slows down when manufacturing paper with pulp the dehydration at wet end.

2. a kind of method that improves paper formation as claimed in claim 1 is characterized in that this method is applicable to light paper.

3. a kind of according to claim 1 or claim 2 method that improves paper formation is characterized in that,

1) in retort, adds a certain amount of clear water earlier, start stirring;

2) add the powdery CMS while stirring, in retort, continue to add clear water then, stirring and making mass percentage concentration is 0.5% carboxymethyl starch soln;

3) continue to stir after 30 minutes, carboxymethyl starch soln is input in the finished product jar;

4) carboxymethyl starch soln in the finished product jar is joined join in the stock tank; Addition is: paper pulp per ton adds 300L～500L carboxymethyl starch soln.