Process for dispersing a fibrous paper stock and device for performing the process

Abstract

Process and apparatus for dispersing fibrous paper stock that includes delivering an aqueous fibrous paper stock, pressing some water out of the aqueous fibrous paper stock to form a highly consistent coarse fibrous paper stock, and introducing the highly consistent coarse fibrous stock into an effective area of a mallet roll having circulating mallets which cooperate with fixed peripheral impact sections. In this manner, the highly consistent coarse fibrous stock is loosened and distributed. The process also includes transporting the highly consistent fibrous paper stock into a dispersing machine, and dispersing the highly consistent fibrous paper stock in a dispersing machine.

Description

[0001] The present application claims priority under 35 U.S.C. .sctn. 119 of German Patent Application No. 100 18 262.3, filed on Apr. 13, 2000, the disclosure of which is expressly incorporated by reference herein in its entirety.[0002] 1. Field of the Invention[0003] The invention relates to a process and device for dispersing fibrous paper stock. The preocess includes providing an aqueous fibrous paper stock, pressing out some of the water to form a highly consistent coarse fibrous paper stock, transporting the highly consistent coarse fibrous paper stock into a dispersing machine, and dispersing with a dispersing machine. The dispersing machine includes at least two dispersing fittings (tools, elements), which have several interlocking lines of teeth and are movable relative to one another at a distance so as to disperse the highly consistent fibrous paper stock.[0004] 2. Discussion of Background Information[0005] Processes of the above-mentioned type are used, for instance, for...

AI Technical Summary

Benefits of technology

[0010] With the aid of this new process, it is possible to produce a highly consistent stock that can be perfectly processed in a dispersing machine. The beetle roller used according to the invention accepts the plug pieces compressed by the water being pressing out and breaks them up, in particular, by cooperation of the circulating beetles with the impact sections fixed to the circumference. Bigger chunks remain in the processing area longer until they can pass so that the stock flow to the dispersing machine becomes very even. Then, it is further reduced and swirled in the radially interior area of the dispersing armaments, creating very fine fibrous crumbs. If desired, steam is introduced subsequently downstream into a heating zone of the armaments in order to heat the stock to the required temperature. Here, due to the previous breaking up, a comparatively short heating duration is sufficient. The dispersing itself, i.e., the modification of the stock characteristics occurs in a dispersing zone of the device that follows downstream.

[0014] A worm extruder can assist in the pressing of water out of the aqueous fibrous paper stock. Further, a transport direction in the worm extruder can be essentially horizontal and an axis of the mallet roll may be essentially horizontal and substantially perpendicular to the worm extruder transport direction.

Problems solved by technology

Since the duration in which the stock remains between them is very short, irregularities cannot be compensated.

The pieces are comparatively large and thus lead to an uneven stock flow through the subsequent devices.

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