Wet strength waste paper processing method

A processing method and technology for waste paper, applied in the field of papermaking, can solve the problems of poor product absorption and air permeability, color change by chemical method, long processing time, etc., and achieve the effect of shortening processing time, stable percussion degree, and shortening processing time.

Inactive Publication Date: 2011-11-16
德州泰鼎新材料科技有限公司
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Problems solved by technology

[0010] The purpose of the present invention is to provide a wet strength waste paper treatment method to solve the problems of long treatment time, high energy consumption, poor absorbency and gas permeability of the product in the prior art; color changes caused by chemical methods, and cannot be used

Method used

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Embodiment

[0022] As shown in the process flow chart: steam condensed water is used as the heat source, a heat exchanger is added to keep the water temperature at 65°C, and the processing time of the pulping process is shortened to 30 minutes. The specific process steps are as follows:

[0023] 1. Pulping: Mix the waste paper with white water heated at 66°C, and perform hydropulping at a concentration of 4.3% for 40 minutes, and then store it in the pulp tank for future use;

[0024] 2. Refining: Lift the raw materials in the storage tank to the refiner for refining. The processing time is controlled at 45 minutes according to the wet strength of waste paper, and the degree of knocking is 33 O SR, wet weight 5g;

[0025] 3. Blending pulp: the blending ratio is 18%.

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Abstract

The invention provides a wet strength waste paper processing method belonging to the technical field of paper making. The method comprises the following steps of: by taking condensed water of steam of a drying part of a paper maker as a heat source, additionally providing a heat exchanger to increase the water temperature of white water for pulping from 30-35 DEG C to 60-70 DEG C; mixing with wetstrength waste paper in a pulper, and performing mild strength connection with softened fibers under a high temperature condition to easily separating the wet strength waste paper under mechanical functions. The specific processes and steps are as follows: (1) pulping; (2) grinding to form pulp; and (3) pulp proportioning to finish processing the wet strength waste paper. By adopting a heating processing method in the invention, the pulp processing time is shortened, electricity consumption during processing is reduced, the strength for breaking the fiber is reduced, the beating degree of the processed pulp is stable, and proportion of waste pulp in the blending can be properly increased as required, so that the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of papermaking. Background technique [0002] Due to the needs of the use function, some paper has a certain wet strength, and the treatment of these unqualified products and waste paper with wet strength performance is a more difficult problem. [0003] There are two traditional processing methods: [0004] 1. Normal temperature refining method [0005] Under normal temperature conditions (usually at 30-35°C), it is processed by a hydraulic pulper and a refiner before being prepared for use. [0006] Disadvantages: (1) Long time and high energy consumption; (2) The treated pulp has a high degree of percussion and high fiber damage strength. When it is reused, the proportion of mixing is limited, otherwise it will affect the absorbency and air permeability of the product. sex. [0007] 2. Chemical method [0008] Under normal temperature conditions (30-35°C), it is processed through a pulper and a refin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/32
CPCY02W30/64
Inventor 王小强关本义冯本东薛斌
Owner 德州泰鼎新材料科技有限公司
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