Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
11~4~
BACKGROUND OF THE INVENTION
The present invention relates to a new and
improved construction of apparatus for processing waste
paper.
The processing equipment or waste paper pro-
cessor of the present invention is of the type comprising
a stock slusher for slushing waste paper, at least one
separation device or separator for heavy contaminants
arranged after the stock slusher and a fiberizer arranged
following the separation device. The fiberizer has an
outlet for good stock, an outlet line or conduit for
light weight substances which are to be separated and an
; outlet for heavy weight substances which are to be separated.
. .
An installation of this type has been dis-
closed, by way of example, in the article entitled "Der
Escher Wyss Fiberizer im Altpaper-Aufbereitungsstrang"
(roughly translated: "The Escher Wyss Fiberizer in Waste
Paper-Processing Line"), appearing in "Wochenblatt fur
Papierfabrikation", Volume 5/1975, pages 165 and 166,
Figures 1 and 2.
~, .
SUMMARY OF THE INVENTION
It is a primary object of the present inven-
tion to improve upon this known installation.
- 2 -
,~
. . , - - ~ - , . - - , ~ - . , ,
l~a4~
Another and more specific ob~ect of the present
invention is to provide an apparatus for processing waste
paper having an improved mode of operation, especially
a better separation effect for heavy contaminants.
Yet a further significant object of the pre-
sent invention aims at a new and improved construction of ~:
apparatus for processing waste paper which is relatively
simple in design, economical to manufacture and operate, -
highly efficient in processing waste paper, and specifically
in removing the heavy contaminants therefrom.
Now in order to implement these and still
further objects of the invention, which will become more
` readily apparent as the description proceeds, the apparatus
of the present development is manifested by the features
that the outlet for the heavy weight substances which are
to be separated is connected by means of an outlet line
or conduit with a location of the apparatus dispositioned
in front of the separation device for the heavy contaminants.
` With the heretofore known installation the
outlet for the heavy weight substances to be separated is
provided with a sluice where there are collected the heavy
weight substances. This sluice had to be opened periodic-
ally in order to remove the heavy weight substances which
were separated.
.
'
.
~ , . . . . . . .
11~44~1
It has been found that the separation effect
of the installation for the heavy weight substances or
particles can be improved by allowing a certain uniform
flow out of the outer region of the fiberizer through the
outlet for the heavy weight substances. At the same time
there is thus avoided any over filling of the outlet for
the heavy weight substances w~ich are to be separated, if,
for instance, the operator forgets to open, at the proper
point in time, the outlet for the heavy weight substances.
This improved operation can be beneficially realized without
the need for installing any additional devices, and specific-
ally, only with the aid of the already existing separation
device, while omitting the sluice.
Preferably there can be arranged in the outlet
line or conduit for the heavy weight substances and also
- in the outlet line or conduit for the light weight sub-
stances shutoff elements, typically valves. A control
device serves for alternately actuating the shutoff elements.
In this way there is obtained a compensation or balancing
of the substance flow from the stock slusher to the
fiberizer, since there are avoided the occurrence of surge-
like fluctuations of such flow velocity by opening one
of the shutoff elements.
,~
The outlet line or conduit for the neavy weight
substances can open into the connection line or conduit
extending between the stock slusher and the separation
- 4 -
49~1
device for the heavy contaminants.
However, the outlet line or conduit for the
heavy weight substances also can lead back to the stock
slusher. In such case the stock slusher is additionally
loaded by the recycled quantity of stock, but, on the other
hand, there is additionally employed the device located in
the stock slusher for separating out the heavy weight
substances.
; BRIEF DESCRIPTION OF THE DRAWING
The invention will be better understood and
objects other than those set forth above, will become
appar0nt when consideration is given to the following
detailed description thereof. Such description makes
reference to the annexed drawing wherein the single Figure
schematically shows an exemplary embodiment of apparatus
for processing waste paper constructed according to the
present invention.
DETAILE_ DESCRIPTION OF THE PREFERRED EMBODIMENTS
Describing now the drawing, the exemplary
illustrated embodiment of apparatus for processing waste
5 --
..
:;
.
1~49~
paper will be seen to comprise a conventional stock
slusher 1 containing a rotor 2 having a substantially
vertical axis and driven by an~ suitable drive motor 3.
Below the rotor 2 there is located a perforated plate
or sieve 4 which delimits a space or chamber 5 for the
withdrawal of good stock. Leading from this space or
chamber 5 is a connection line or conduit 6 to a separa-
tion device or separator 7 for separating out heavy con-
taminants. A pump 8 for conveying the dissolved stock
or suspension is located in the connection line or conduit
6.
The stock slusher 1 is equipped with a sluice
10 for the removal of heavy contaminants which have been
separated in the stock slusher 1. Reference character 11
represents bales of waste paper which are introduced into
the stock slusher 1. Additionally, the arrow 12 schematically
; represents the infeed of water serving for slusher or
dissolving the waste paper.
The separation device 7, which can be designed
in the fashion of a hydrocyclone, has a sluice 13 for the
removal of the separated heavy contaminants. As a rule, at
this location there are used a battery or array of a number
of parallel connected hydrocyclones.
Leading from the separation device 7 is a
connection line or conduit 14 to a fiberizer 15 (also
referred to in the art as a stock pulper), which, for in-
stance, can be designed in accordance with the teachings of
the commonly assigned, United States Patent No. 3,942,728,
granted March 9, 1976 (corresponding to German Patent
No. 2,345,735). This fiberizer 15, containing a rotor
17 driven by a drive motor 16, is provided with an inlet
18 for the stock suspension which is to be processed, an
outlet 20 for good stock, and an outlet 21 for light
weight substances or particles which are to be separated
and an outlet 22 for heavy weight substances or particles
; which are separated. At the outlet 21 for the light
weight substances which are to be separated there is con-
nected an outlet line or conduit 23 which leads to a
dynamic jarrer or vibrator 24 or equivalent structure
having a movable sieve or screen 25. The fiber-
containing liquid passing through the sieve 25 is
returned by a line or conduit 26 back to the stock
slusher 1.
At the outlet 22 for the heavy weight sub-
stances which are to be separated there merges an outlet
line ox conduit 27.which opens into the conduit or line 6 -
; in front of the pump 8 and forwardly or upstream of the
~ .
~44~1
separation device 7. As indicated however by the broken
line illustrated conduit or line 27' this outlet conduit
or line 27 also can lead back into the stock slusher 1.
As already mentioned the heavy weight sub-
stances or particles which have been separated in the
fiberizer 15 are once again fed by the outlet line or con-
duit 27 back into the separation device 7 where they can
be finally separated. With return flow or feedback of the
heavy weight substances, separated in the fiberizer 15,
to the stock slusher 1, there is in fact afforded the possi-
bility of separating out the heavy weight substances in such
stock slusher 1 where they then arrive at the sluice 10.
According to the invention there is thus achieved an improve-
ment in the separation action or effect for the heavy
weight substances or particles in the apparatus, without
the need for additional devices, only by resorting to the
aid of a return line or conduit.
As also will be further apparent from the
showing of the drawing, shutoff elements 30 and 31 are
arranged in the outlet lines or conduits 23 and 27,
respectively. These shutoff elements 30 and 31, as
mentioned typically valves, are connected with any suitable
control device or control means 32 which alternately
actuates these shutoff elements. Consequently, the flow
or stream containing the heavy contaminants emanating from
the outlet 22 is briefly interrupted, something which
only inconsequentially impairs the effect of the processing
method. A longer closing and only brief opening of the
light weight substance line or conduit is advantageous.
The advantage of this is the compensation of the flow
between the stock slusher 1 and the fiberizer 15, thereby
preventing an increase of the peak value of its throughput.
_ g _
