A kind of formula of low grammage paper and its production method

Abstract

The invention relates to the technical field of paper making, in particular to a formula and a production method for low-grammage paper. In the formula, paper pulp, an additive and a painting are included, wherein the additive comprises 100-550 ppm of nano attapulgite crystal, 300-800 ppm of fluorescent brightener, 20-40 ppm of staining agent, 3-6 percent of filler and 1.0-1.4 percent of amylum according to proportions; the painting comprises 50-80 ppm of heavy calcium carbonate and 65-70 ppm of amylum according to proportions. The production method for the low-grammage paper adopts the formula and comprises the steps as follows: after pulping, the additive is added to the paper pulp, agitated, placed in a strong magnetic field and thermally treated for 1 hour at a high temperature; formation water filtration making, pressing dehydration, front section drying, glue coating, painting coating, smooth pressing and rolling are sequentially performed. The paper foundation paper made by adopting the formula and the production method is 80g / m<2> to 84g / m<2> in weight, can satisfy requirements of a printing machine on the hardness of the paper, and effectively improves the paper opaqueness.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to the formulation of low-gram-weight paper and a production method thereof. Background technique [0002] The lower the grammage of paper, the smaller the impact on the environment, so low grammage paper is more and more favored by carton companies. With the rapid development of knowledge economy and the development trend of circular economy, especially the production process of low-weight paper can effectively reduce the consumption of raw materials, so the demand for low-weight paper is getting higher and higher. It accounts for 20%~50% of the cost of a job (according to the number of jobs and the number of prints). Some printing buyers, especially publishers, use a large amount of light paper with low weight in order to reduce the production cost of printing jobs. to replace heavy paper. [0003] However, low-weight paper is not equal to thin paper. Instead, it reduces the...

AI Technical Summary

Problems solved by technology

However, at present, the production of low-grammage paper in my country is relatively behind some developed countries in the world. Although the produced low-grammage paper can meet the weight standard, the performance in printing on the machine is not satisfactory. In order to ensure the smooth progress of printing, paper Must have sufficient hardness

at 90g / m 2 For example, double-sided coated paper, its coating weight is about 25g / m 2 ~30g / m 2 , while the weight of the base paper is only 60g / m 2 ~65g / m 2 , so it is impossible to meet the printing machine's requirements for paper hardness

Insufficient hardness means that the paper cannot be kept flat during the printing process, which in turn affects the production efficiency of the printing factory

Paper with low hardness will reduce the production speed of the printing press from 14,000 prints / hour to 10,000 prints / hour, so that the production efficiency of the printing plant will drop by 30%

[0004] In addition, the opacity of low-weight paper is also a problem, and paper that is too light will show through during printing

In order to avoid this situation, under normal circumstances, people can choose thin paper that has been specially treated (coating a layer of titanium dioxide on the offset printing paper to enhance its opacity), but the price of this paper is usually more expensive