Pulp bleaching device for packaging paper

Abstract

The invention discloses a pulp bleaching device for packaging paper. The device comprises a reaction kettle and a reaction tank. The reaction kettle is installed in the reaction tank; the reaction tank is installed on a base; the reaction kettle is a cylindrical structure, and the outer side of the reaction kettle is surrounded by a heating pipe; a mounting ring plate and a mounting strip plate are arranged in the reaction kettle; the mounting ring plate is provided with a high-pressure nozzle hole; a pushing device is arranged in the reaction tank; and the upper inner side wall of the reaction tank is provided with an air inlet hole, which is communicated with a steam generator through an intake pipe. The device has a high-efficiency bleaching effect. By the device, paper pulp can be fully contacted with a bleaching agent; the bleaching time can be saved and the bleaching process can be simplified; the damage to the fiber structure of paper pulp by multiple operation steps is reduced,and the original quality of paper pulp can be guaranteed; the bleaching efficiency can be improved; equipment investment and floor space are reduced; and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of packaging paper production and processing, and in particular relates to a pulp bleaching device for packaging paper. Background technique [0002] In recent years, the output and consumption of paper products in my country have grown rapidly, especially people's demand for high-quality and high-grade packaging paper is increasing day by day. The increase in demand has led to the rapid development of various pulp types. In the fierce market competition, customers have higher and higher requirements for end products, and the improvement of product intelligence will generally lead to an increase in production costs. As an important part of chemical pulping, bleaching process has a great impact on the quality of end products. and cost have a significant impact. [0003] Reduction bleaching is the use of reductive bleaching agents to change the chromophoric group and decolorize it. Since it will not cause the...

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Problems solved by technology

[0003] Reduction bleaching is the use of reductive bleaching agents to change the chromophoric group and decolorize it. Since it will not cause the loss of limiting components and maintain the characteristics of the original pulp, it is especially suitable for groundwood, chemical Bleaching of mechanical pulp, etc., when bleaching hydrogen peroxide, it usually needs to be bleached at 90-100 ° C for one hour, but the higher the temperature, the higher the bleaching effect and efficiency of hydrogen peroxide, and the original bleaching device A sufficient amount of hydrogen peroxide needs to be added to contact the pulp to achieve the oxidation effect, and the pulp cannot be blown to a higher degree, and multi-stage bleaching is often used, such as three-stage bleaching, five-stage bleaching, etc., in order to make the pulp bleach to meet the use The required whiteness can neither guarantee the bleaching rate nor cause more input of raw materials

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