Production method of regenerated ultralow-gram-weight high-strength corrugated base paper

Abstract

The invention provides a production method of regenerated ultralow-gram-weight high-strength corrugated base paper, which can ensure the physical strength of the base paper and reduce the impurity treatment load. The method comprises the steps of drum pulping, coarse screening, classifying screening, short fiber purifying treatment, long fiber purifying treatment, long fiber fine screening, shortfiber concentration, long fiber concentration, pulp preparation and paper machine papermaking. Domestic OCC waste paper raw materials are made into pulp through a drum pulping device, the pulp is screened by a pressure screen, the pulp subjected to the coarse screen is subjected to classification screening to divide fibers into long fibers and short fibers, short fiber good pulp and long fiber good pulp are proportionately mixed, the mixed pulp is sent to a papermaking forebay, the pulp is thickened, diluted, dispersed by a before-net, molded by a forming screen, dehydrated at the screen partto obtain wet paper sheets, the wet paper sheets are subjected to steam drying at a front drying part and then enter a film transfer surface sizing machine for surface sizing, and the paper sheets subjected to surface sizing enter a rear drying part for drying.

Description

【Technical field】 [0001] The invention relates to the field of papermaking, in particular to a production method of recycled ultra-low grammage high-strength corrugated base paper. 【Background technique】 [0002] Due to the quality of waste paper raw materials, production equipment and technology, 70g / m 2 The production of the following quantitative corrugated medium paper is still relatively small. According to market supply and demand information, there is basically no 50g / m2 packaging paper and cardboard market 2 The following quantitative corrugated medium. At present, the low-gram weight products on the market mainly use domestic waste paper OCC and some imported waste paper American waste AOCC and European waste EOCC to increase the strength of the paper sheet. However, since domestic waste paper is mainly grass fiber, which contains many impurities, low fiber length, and low strength, how to ensure the strength of the fiber hinders the low-quantity process of high-...

AI Technical Summary

Problems solved by technology

However, since domestic waste paper is mainly grass fibers, which contain many impurities, low fiber length, and low strength, how to ensure the strength of fibers hinders the low-quantity process of high-strength corrugated base paper

However, the existing production technology generally uses a hydraulic pulper to pulp the waste paper. In this kind of disintegration method, because the secondary fiber is cut by the blade of the paper shredder, the fiber becomes shorter, resulting in a change in the physical index of the paper. decline

Plastic impurities, etc. are cut and become smaller, so they enter the next process with the slurry, thereby increasing the processing load of the next process

In addition, due to the low basis weight of the paper machine, the cleanliness of the slurry is low, the wet strength and dry strength of the paper are low, the paper is easy to break in the wet end and the dry end, especially in the surface sizing area, and the paper is easy to stick. Difficulty in rewinding due to paper

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