Paper pulp dehydration process and device for producing high-strength wallpaper base paper

Abstract

The invention discloses a paper pulp dehydration process and device for producing high-strength wallpaper base paper. The paper pulp dehydration comprises a dehydrating rack, wherein an upper pressingroller and a lower pressing roller are connected to the dehydration rack; the outer side of the upper pressing roller is sleeved with a boot sleeve; two isolation blankets are arranged between the boot sleeve and the lower roller; a pressurizing piece for applying pressure to the boot sleeve is arranged in the upper pressing roller; an ejection assembly is arranged on one side of the pressurizingpiece; a scraping assembly for scraping out adhered raw paper pulp from the outer side of the boot sleeve is arranged on the outer side of the boot sleeve; boot pressure dehydration is carried out onthe raw paper pulp by utilizing the arranged pressurizing piece; during dewatering, the arranged ejection assembly is started to eject out from the interior of the boot sleeve; the raw paper pulp adhered to the outer surface of the boot sleeve is ejected out, and meanwhile, under the combined action of the scraping assembly, the raw paper pulp is conveniently scraped from the outer side of the boot cover, so that the raw paper pulp adhered to the outer surface of the boot cover in the boot pressing process is conveniently scraped out, and the damage of the raw paper pulp in the dehydration process is reduced.

Description

Technical field [0001] The invention relates to the technical field of papermaking devices, in particular to a pulp dewatering process and device for producing high-strength wallpaper base paper. Background technique [0002] Modern papermaking procedures can be divided into the main steps of pulping, preparation, papermaking, and processing. After the wet paper web is drawn from the bed roller of the wire part, it usually contains about 80% moisture and the strength is not high. If it is sent directly to the dryer part for drying, it will not only consume a lot of steam, but also because of the strength of the wet paper web. Poor, it is easy to cause breakage in the drying part, and the paper dried in this way is loose, rough in surface and poor in strength. The use of mechanical squeezing to further dewater and improve the dryness of the paper web. At the same time increase the tightness and strength of the paper, and improve the surface properties (such as smoothness) of the...

AI Technical Summary

Problems solved by technology

[0003] In the production process of high-strength wallpaper base paper, it is necessary to dehydrate the base paper pulp. In the dehydration process of the base paper pulp, the existing treatment methods include belt dehydration, spiral dehydration and boot dehydration. Among them, the boot dehydration The dehydration is through the mutual extrusion of the shoe press roller and the lower press roller to squeeze out the water from the base paper pulp. At the bottom of the shoe press roller, due to the matching groove area of ​​the lower press roller, the dehydration area and efficiency are increased. There is a more efficient dehydration method for pulp dehydration. During shoe dehydration, the shoe cover is squeezed by the shoe pressure block inside the shoe press roller, and the water is squeezed out through the pressing action of the shoe cover and the lower press roller. The original pulp has a certain viscosity. During the extrusion process, the original pulp is easy to adhere to the depression on the outer surface of the boot cover through the hair septum, causing damage to the original pulp after dehydration. For this reason, we propose a high-strength wallpaper Pulp dehydration process and device for base paper production

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