Process for dissolving used paper

a technology of used paper and dissolving technology, applied in the field of dissolving used paper, can solve the problems of high sorting and cleaning expenditure, difficult to remove these particles, and not being free of impurities

Inactive Publication Date: 2001-07-05
VOITH PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Besides the high energy consumption in the pulper, another undesired result of the known process can be a breaking down of non-fibrous attendant materials to the extent that it becomes difficult to remove these particles.
The large amount of such foreign materials arriving in the suspension necessitates a high sorting and cleaning expenditure.
While this process is good and effective, it is also expensive.
In this process, a type of used paper occurs as well, which exists as air-dry pieces or scra...

Method used

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  • Process for dissolving used paper
  • Process for dissolving used paper

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Embodiment Construction

[0041] The particulars shown herein are by way of example and for purposes of illustrative discussion of the embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the present invention. In this regard, no attempt is made to show structural details of the present invention in more detail than is necessary for the fundamental understanding of the present invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the present invention may be embodied in practice.

[0042] In the plant schematically shown in FIG. 1, used paper R falls in a loose pour onto a conveyor belt 5 in pieces such as, e.g., those that result from shredding used paper. Conveyor belt 5 can be provided with a weighing device 17 for determining the amount of used paper R delivered. At the end of first conveyor be...

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Abstract

Process for dissolving used paper including adjusting a content of solid particles of used paper to a range between about 15 and 35%, kneading the used paper with a specific work of at least about 10 kWh/t, diluting the kneaded used paper to a content of solid particles below about 6%, separating non-fibrous contaminants with wet screening, adjusting a solid material content to less than about 3%, and separating heavy particles with at least one hydrocyclone.

Description

[0001] The present application claims priority under 35 U.S.C. .sctn. 119 of German Patent Application No. 100 00 181.5, filed on Jan. 5, 2000, the disclosure of which is expressly incorporated by reference herein in its entirety.[0002] 1. Field of the Invention[0003] The present invention is directed to a process for dissolving used paper.[0004] 2. Discussion of Background Information[0005] It is known that processes of the above-mentioned type are performed in such a way that the used paper is supplied to a pulper in the state in which it was delivered to the paper factory. Here, this pulper serves to mix in water and to dissolve the paper webs. If necessary, a station for removing bale wires or bale edges can be provided before the pulper. As a rule, all components of the used paper bale, possibly without these wires or edges, are dropped into the pulper and are mechanically processed with more or less intensity. Besides the high energy consumption in the pulper, another undesire...

Claims

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Application Information

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IPC IPC(8): D21B1/32
CPCD21B1/32Y02W30/64
Inventor DOCKAL-BAUR, JURGENGOMMEL, AXELMULLER, WOLFGANGSELDER, HARALDSTEIDELE, ANDREASSTEINBILD, KLAUS
Owner VOITH PATENT GMBH
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