Dehydration machine

Details Dehydration machine Dehydration machine

1999-12-28

2001-03-27

Gravini, Stephen (Department: 3747)

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

C034S119000, C210S771000

Reexamination Certificate

active

06205675

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a dehydration machine for dehydrating stuff such as used papers or virgin pulps.
2. Description of Related Art
Recycling of used papers has been demanded in the paper making industry for a long time in view of the need to better protect the natural environment. In this connection, various kinds of used paper processing machines have been developed in response to an increased demand of used papers.
An example of such machine is provided with a screw in a drum. The machine was designed to separate used paper into fibers and liquid by simply rotating, using the screws, used papers with liquid in the drum. However, in this machine, it was inevitable that a large amount of fibers flows out of the drum. Furthermore, it is not feasible to recycle the waste liquid that flows out of the drum because ink or the like is mixed therein.
The present inventors discover that it is effective to dehydrate used papers prior to the deinking process to enhance the deinking efficiency in the process. Based on the discover, the present inventors have accomplished the present invention.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a dehydration machine which can effectively dehydrate stuff such as used papers or virgin pulps.
According to the present invention, a dehydration machine includes a stuff tank, a stuff inlet provided at a lower portion of the stuff tank, a stuff outlet provided at an upper portion of the stuff tank, and a pair of drums each having a circumferential wall with a plurality of water passage apertures, wherein the pair of drums is juxtaposed in the stuff tank. The pair of drums rotate adversely about its respective axis so as to introduce stuffs in the stuff tank therebetween from a lower side thereof. One of the drum is rotatable in an immovable manner, and the other of the drums is rotatable in an inclinable manner while being urged toward the one of the drums by an air spring. Each of the drums is provided with a mesh member on an outer surface of the circumferential wall.
It is also preferable that the mesh member provided on one of the drums (i.e., the immovable drum) is a metal fine mesh, and the mesh member provided on the other of the drums (i.e., the inclinable drum) is a metal course mesh.
The mesh member may include an inner metal mesh and an outer metal mesh, wherein the inner metal mesh is twice coarser than the outer metal mesh.


REFERENCES:
patent: 4079524 (1978-03-01), Amicel et al.
patent: 4102791 (1978-07-01), Otte
patent: 4663040 (1987-05-01), Elizondo et al.
patent: 4782747 (1988-11-01), Unger et al.
patent: 5666741 (1997-09-01), Bubik et al.
patent: 5669155 (1997-09-01), Hughes et al.
patent: 6004468 (1999-12-01), Barbulescu et al.

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