Slurry distribution device and method for uniform slurry distribution of dispersed fibers in headbox

Abstract

The invention discloses a pulp distribution device and method for disperse fiber even pulp distribution of a flow box. The pulp distribution device comprises a front assembly, a middle assembly and a rear assembly which are sequentially connected to form a continuous pulp distribution flowing channel, a sudden shrinkage flowing channel is arranged at the center position of the middle assembly, and a first sudden expansion region, a sudden shrinkage region, a second sudden expansion region and a gradual shrinkage region are sequentially arranged in the pulp distribution flowing channel. The pulp distribution method includes that pulp enters the pulp distribution flowing channel from a pulp inlet pipe, first passes through the first sudden expansion region to decelerate, then enters the sudden shrinkage region to accelerate, passes through the sudden shrinkage flowing channel and enters the second sudden expansion region to decelerate to generate turbulence and enable disperse fiber to be subjected to flocculation, the pulp with even disperse fiber is obtained and enters the gradual shrinkage region, and finally the pulp is delivered into a turbulence generator through a pulp outlet. By means of the device and method, the pulp can generate turbulence in the acceleration or deceleration process, the fiber in the pulp is dispersed more evenly, and paper forming quality of the pulp is effectively improved.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to a pulp distributing device and method for evenly distributing pulp with dispersed fibers in a headbox. Background technique [0002] In the field of pulp and papermaking, the headbox is a key part of the paper machine. In the papermaking process, the headbox is generally required to distribute the slurry evenly along the transverse direction of the paper machine, effectively disperse the fibers and prevent flocculation. At the same time, according to According to the technical requirements, maintaining a stable pulp-to-wire speed ratio provides the necessary premise for good forming of the paper web. A general headbox consists of a slurry distributor (conical tube slurry distributor or equal pressure slurry distributor), a slurry distribution element, a steady flow chamber, a turbulence generator and a lip area. Slurry distribution elements are generally orifice ...

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Problems solved by technology

However, in practical application, the headbox of this structure still has the following defects: First, the slurry distribution area where the sudden shrinkage channel is located is square, and there is no transition channel at the entrance and exit of the sudden shrinkage channel, which is easy to The pulp fiber flocculation at each corner is caused, and the fiber dispersion effect is poor; the second is that the height of the steady flow chamber is equal to the height of the turbulence generator, but all turbulence generators have effective heights, such as figure 2 As shown, L in the figure is the effective height of the turbulence generator. The space outside the effective height is useless for the slurry distribution of the turbulence generator, and if the stabilization chamber is too high, it will affect the flow velocity of the slurry, thereby affecting fiber dispersion

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