Pulp boiling technique with liquid pressing mode

Abstract

The invention discloses a liquid pressing method pulp stewing technology suitable for the mucilage glue cellucotton manufacture process in the textile industry so as to solve the problems of uneven temperature in a ball, nsynchronous poly decreasing of the polymerization degree of down and low stewing quality of the existing stewing technique. The scheme adopted by the invention is that: the steps include the processes of raising temperature, exhausting air and raising the temperature again; pressing out the affluent lye after raising the temperature again, namely the pressing liquid; complementing the temperature to the temperature before the pressing liquid after pressing out. The invention presses out the affluent lye after raising the temperature and increases the gas phase space in the ball so as to improve the turning effect and the heat transmission effect of fiber in the ball, promote the stewing heat preservation effect and improve the stewing quality.

Description

technical field [0001] The invention belongs to the technical field of pulp cooking process in the pulp production process, and can be widely used in the production of all types of pulp by steam ball cooking, and is especially suitable for hydraulic pulp in the production process of viscose fiber cotton pulp in the textile industry Meal cooking process. Background technique [0002] In the process of pulp production, the cooking process is one of the key factors affecting the quality of pulp, and the quality of cooking is very important to the quality of viscose rayon. [0003] At present, pulp production, such as cotton pulp for viscose fiber, uses steaming balls to cook cotton linters. In order to improve cooking uniformity and product reaction performance, general manufacturers use high liquid ratio cooking, so that the free lye in the balls is relatively small. In addition, the cotton linters and lye in the steaming ball are continuously heated by steam, and the steamin...

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Problems solved by technology

[0003] At present, pulp production, such as cotton pulp for viscose fiber, uses steaming balls to cook cotton linters. In order to improve cooking uniformity and product reaction performance, general manufacturers use high liquid ratio cooking, so that the free lye in the balls is relatively small. In addition, the cotton linters and lye in the steaming ball are continuously heated by steam, and the steaming ball rotates continuously during the heating process. The lye and lint in the ball are bad conductors of heat, and the materials in the ball cannot be relied on. Heat conduction and radiation transfer heat; the upper part of the ball is steam, the lower part is lye and lint, the upper steam cannot increase the temperature of the lower liquid phase by convection, and because there is more lye in the ball, the friction of lye The coefficient is small, so the cotton linters cannot roll with the rotation of the steaming ball. The above reasons cause the temperature distribution in the ball to be uneven, and the degree of polymerization of the linters is not synchronized, which affects the cooking quality.

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