Title of Invention

A METHOD FOR REGULATING WHITENESS OF PRINTING INK REMOVAL IN A DELINKING INSTALLATION, AND A DELINKING INSTALLATION

Abstract The invention relates to a method for regulating whiteness for removal of printing ink in deinking installations, whereby printing ink particles in a fiber suspension are removed in a flotation cell (20) by means of gas bubbles. Said removal is carried out by removing the foam produced in a foam gutter (11), the amount of foam removed being adjusted. The method comprises the steps of measuring (24) a feed whiteness (ZW) of the fiber suspension added; determining an adjustable variable (SRN) as a function of the feed whiteness (ZW) and a predetermined desired value (SW) for an acceptor whiteness of the removed fiber suspension (26); adjusting the quantity of the removed foam subject to the adjustable variable (SRN).
Full Text FIELD OF THE INVENTION
The invention relates to a method for regulating whiteness of
printing ink removal in deinking installation. Furtherfflore» the
invention relates to a deinking installation comprising a
flotation cell in which printing ink i« removed from a fibrous
stock suspension.
BACK6ROUND OF THE INVENTION
One important process step during the recycling of waste paper is
the removal of printing ink. To this end» first of all a fibrous
stock suspension is produced from the waste paper provided and
this is led into a flotation cell. In the case of floation
deinking) as it is known* all bubbles stream through the fibrous
stock suspension« on which bubbles printing ink particles are
deposited by adhesion effects and are removed with the foam
forming on the surface of the fibrous stock suspension in the
flotation cell. The cleaned fibrous stock suspension removed from
the flotation cell is called accepts.
The whiteness of the accepts determines the whiteness of the
finished paper produced at the end of the waste paper
preparation. The value of whiteness is predefined within narrow
limits. In order to keep the target whiteness of the finished
paper within these limits^ the removal of printing ink in the
deinking process must be adjusted in order to obtain the most
constant accepts whiteness. This adjustment is made substantially
more difficult by the following aspects:
1. The desired value of the control system relates to the
whiteness of the finished paper^ which is previously measured in
the laboratory on sample sheets produced with some effort.
However the removal of printing ink is only one step in the
preparation chain, in actual fact* many hours elapse between the
input of the waste paper and the cleaning in the flotation cell
and the paper production, so that a change in the whiteness has
an effect in the accepts whiteness of the waste paper only after
a considerable passage time.
2. The passage times of the fibrous stock suspension through
the printing ink removal are about 10 to 30 minutes. Therefore»
regulation with respect to the result of the printing ink
removal« that is to say the accepts^ can react only slowly.
3. The process of printing ink removal is very highly subject
to the disturbances which are substantially caused by the
fluctuating composition of the waste paper raw material. This
composition is virtually impossible to detect by means of sensors
or to control in real time.
4. The value range of the actuating variables is highly
restricted for technological reasons* which means that the
control quality that can be achieved is limited.
On account of these difficulties* deinking installations have
previously been operated without regulation. To this end, the
operating parameters of the installation are set permanently and
these are changed only occasionally manually during continuous
operation on the basis of empirical values.
OBJECTS OF THE INVENTION
It is an object of the present invention to provide a method for
regulating whiteness for removal of printing ink in deinking
installations and also a deinking installation in which the
whiteness of the accepts flow can be set. This object is achieved
by a method and by a deinking installation according to the
features of the invention.
SUIWARY OF THE INVENTION
According to a first aspect of the present invention* a method is
provided for regulating whiteness of the printing ink removal in
deinking installations. In this case* printing ink particles in
a fibrous stock suspension are removed in a floation cell by
means of gas bubbles. The removal is carried out by discharging
the foam forming into a foam channel. In this case» first of
all a feed whiteness of the fibrous stock suspension fed in is
measured and an actuating variable is then determined as a
function of the feed whiteness and a predefined desired value for
an accepts whiteness of the fibrous stock suspension discharged
from the flotation cell. The quantity of foam discharged is set
as a function of the actuating variable.
The method according to the invention offers the possibility of
controlling the accepts whiteness of the fibrous stock suspension
discharged by the feed whiteness being determinedj for example
with the aid of sensors« and an actuating variable being
calculated or determined from the value of the feed whiteness and
of the predefined desired value for an accepts whiteness. The
actuating variable determines the quantity of the foam discharged
into the foam channel on the flotation cell. The method according
to the invention has the advantage that the accepts whiteness can
be regulatedi so that this is more independent of the quality of
the fibrous stock suspension fed in.
The quantity of foam discharged can be carried out by setting a
foam channel level* in particular with the aid of foam channel
level regulation. The foam channel level indicates the height of
the foam discharged in the foam channel. The foam channel is a
collecting container beside the flotation cell) from which foam
flows into the foam channel via an overflow weir. The adjustment
of the foam channel level constitutes a particularly simple
possibility of defining the quantity of printing ink particles
removed from the fibrous stock suspension in the flotation cell.
in particular, the regulation of the foam channel level is
carried out by the control of the quantity of fibrous stock
suspension drained off from the flotation cell. Given a constant
inflow of fibrous stock suspension into the flotation cell, the
quantity of foam discharged is thus determined by the quantity of
fibrous stock suspension removed from the flotation cell. The
height of the foam in the foam channel determines the quantity of
foam discharged. If the foam channel level is high, then a large
quantity of foam flows out of the flotation cell into the foam
channel per unit time, if the foam channel level is low, then a
small quantity of foam flows out of the flotation cell into the
foam channel.
Provision can be made for parameters of the fibrous stock
suspension to be measured, the actuating variable being
determined as a function of the parameters of the fibrous stock
suspension in the flotation cell. As a result, more precise
control of the accepts whiteness can be carried out since, in
particular, the foam formation, that is to say the quantity of
foam forming, depends on the parameters of the fibrous stock
suspension, such as the viscosity.
The actuating variable is preferably determined by using a
functional relationship and/or by using a lookup table.
Provision can be made for the accepts whiteness of the fibrous
stock suspension discharged from the flotation cell to be
measured, the desired value for the accepts whiteness being used
to determine a regulation value which is applied to the actuating
variable in order to compensate for deviation of the accepts
whiteness from the desired value. As a result* a regulation
method is provided with which control errors can be compensated
for. In particular, provision is made for the regulation value to
be determined with the aid of a PI regulation system.
Provision can also be made for the actuating variable to have one
or more adaptation values applied to it. The adaptation values
can be determined in an adapation method as a function of the
feed whiteness, the accepts whiteness and/or the stock parameters
and are used for the fine adjustment of control method with which
the accepts whiteness of the fibrous stock suspension discharged
is to be adjusted. In particular, the adaptation can be carried
out by an offset between the desired value of the accepts
whiteness and the measured accepts whiteness being integrated and
added to to the actuating variable.
According to a. further aspect of the present invention, a
deinking installation comprising a flotation ceil for printing
ink removal is provided. It has a feed line in order to lead a
fibrous stock suspension into the flotation cell. Also provided
is an accepts line in order to lead the fibrous stock suspension
out of the flotation ceil. A foam channel is used to accommodate
foam which is produced as a result of the removal of printing ink
particles from the fibrous stock suspension with the aid of gas
bubbles, the quantity of foam discharged being adjustable. A feed
whiteness sensor is provided in order to measure the feed
whiteness of the fibrous stock suspension. Control is provided in
order to determine an actuating variable as a function of the
measured feed whiteness and a predefined desired value for an
accepts whiteness of the fibrous stock suspension discharged and
to adjust the quantity of foam discharged on the basis of the
actuating variable.
The deinking installation according to the invention has the
advantage that the whiteness of the accepts can be adjusted in
accordance with control in order to ensure the most constant
quality of the cleaned fibrous stock suspension for the paper
production. A sensor is preferably provided in order to measure
one or more parameters of the fibrous stock suspension, the
actuating variable being determined by the control as a function
of the parameter or parameters. In this way* the action of
influencing the removal of foam can be taken into account
appropriately by means of parameters such as the viscosity when
determining the actuation variable* so that the quantity of foam
discharged can be adjusted on the basis of the stock parameters.
The quantity of foam discharged can preferably adjusted via the
foam channel level. To this end» a foam channel level regulating
unit is provided in order to regulate the foam channel level by
regulating an accepts flow through the accepts line in accordance
with a desired foam channel level. With the aid of the foam
channel level regulating unit, it is therefore possible to adjust
the quantity of foam discharged imto the foam channel in a simple
way by controlling the flow through the accepts line.
The deinking installation preferably has a whiteness regulating
unit in order to generate a regulation value as a function of the
desired accepts whiteness and the measured accepts whiteness and
in order to apply the regulation value to the actuating variable.
In this way* the control can be refined by a regulation value
which depends on the deviation between the measured accepts
whiteness and the desired accepts whiteness.
An adaptation unit is provided in order to generate an adaption
value as a function of the deviation of the desired accepts
whiteness and the measured accepts whiteness and in order to
apply the adaptation value to the actuating variable. The
adaptation unit is used to adjust the control during continuous
operation if) for example* the measured accepts whiteness
deviates from the expected accepts whiteness. To this end? the
adaptation unit generates adaptation values which are combined
with the actuating variable.
In particular) the adaptation unit is configured in such a way as
to generate an adaptation value by an offset between the desired
value of the accepts whiteness and the measured accepts whiteness
being integrated and added to the actuating variable.
BRIEF DESCRIPTION OF THE ACC0MFANY1N6 DRAWIN6S
Hreferred embodiments of the invention will be explained in more
detail in the following text by using the accompanying drawings*
in whichs
Figure 1 shows a block diagram of an installation for waste
paper preparation;
Figure 2 shows a cross section through a flotation cell;
Figure 3 shows a block diagram of a deinking installation
having control according to a first embodiment of the invention;
Figure 4 shows a block diagram of a deinking installation
having control and regulation according to a second embodiment
of the invention; and
Figure 5 shows a block diagram of a deinking installation
having controls regulation and an adaptation unit according to
a third embodiment of the invention.

DETAIL DESCRIPTION OF THE INVENTION
Figure 1 illustrates a block diagram of an installation for
waste paper preparation. In a pulper 1« waste paper is
disintegrated in waste and) as a result) a fibrous stock
suspension is produced. The disintegration of the waste paper is
normally carried out batch by batch but the fibrous stock
suspension produced in this way being supplied continuously in
the subsequent process steps.
in a cleaner 2» coarse contaminants are removed from the fibrous
stock suspension. This is normally carried out by means of a
centrifugal field* with which heavy particlesj such as metal
staples* can be removed from the fibrous stock suspension.
The fibrous stock suspension is led through flotation cells 3 and
interspersed with gas bubbles. A plurality of flotation cells 3
are normally arranged one after another, the fibrous stock
suspension passing through these flotation cells one after
another. In the flotation cells 3, the fibrous stock suspension
is enriched with air bubbles, as a result of which, on account of
adhersian effects, printing ink particles are deposited on the
air bubbles and are carried with them to the surface of the
fibrous stock suspension. On the surface there forms a black foam
(rejects)» which is removed and used materially or thermally. The
remaining fibrous stock suspension (accepts) is led onward to a
disperger 4.
In the disperger 4 the remaining printing ink particles in the
fibrous stock suspension are broken down, so that they are no
longer visible to the eye.
After that, the fibrous stock suspension is bleached in a
bleaching device 5 in order to increase the whiteness, so that
paper can subsequently be produced from the fibrous stock
suspension in the paper machine 6. The process steps of
flotation, dispersion and bleaching are often carried out
repeatedly one after another.
In figure 2, a flotation cell 12 is illustrated schematically in
cross section. The fibrous stock suspension is admixed with air
and is led into the flotation cell 12 in such a way that the
printing ink particles can be deposited on the air bubbles as
foam 13 and can thus collect at the surface of the fibrous stock
suspension in the flotation cell. The flotation cell has an
overflow weir 1D» over which the foam 13 removed can flow into a
foam channel 11 and is discharged from there. Thus, part of the
fibrous stock suspension is discharged with the foam 13 as
rejects and another part is led out of the flotation cell 12 as
accepts.
The efficiency of the flotation cell 12» that is to say the mass
of printing ink which is removed with the air bubbles, depends
nonlineariy on numerous different process parameters, for example
on the volume flow in the feed, accepts and rejects, on the
fibrous stock composition, on the optical properties of the
fibrous stock suspension, on the consistency in the feed and on
the content of fines and fillers of the suspension. Because of
these multiple dependencies, it is the prior art to operate
flotation cells with a constant setting.
The foam channel level, that is to say the height of the foam in
the foam channel, is normally constantly regulated to an intended
foam channel level. It is set via an actuating valve Inot shown),
which adjusts the flow in such a way that the foam channel level
remains constant. The disadvantage of this concept is that, with
a good input quality, too many rejects are produced and, with
a poor input quality, too, few rejects are produced. This
leads to severe fluctuations in the accepts quality.
In figure 3, a block diagram of a deinking installation
(controlled to intended whiteness) with a flotation cell is
illustrated . The flotation cell 20 of the deinking installation
has a feed 21, via which fibrous stock suspension is led into the
flotation cell 20, and a discharge 26, via which the accepts are
led to the next process steps 27. Fitted to the feed 21 is a
feed whiteness sensor 24, which determines the feed whiteness of
the fibrous stock suspension supplied to the flotation cell 20
and provides this whiteness to a control unit 22.
The feed whiteness ZW is compared with an intended whiteness SW,
which is likewise provided to the control unit 22. From this, the
control unit 22 generates an actuating variable SRN, with which
the quantity of the foam removed in the flotation cell 20 can be
adjusted. The actuating variable SRN is used as an intended
predefinition for the regulation of the foam channel level, which
in turn determines the quantity of foam removed. If a high foam
channel level ia predefined, the quantity of foam removed is
high; if a low foam channel level is predefined, it is low.
The setting of the foam channel level predefined by the
actuating variable SRN is carried out by a largely independent
foam channel level regulating unit 23, by the value respectively
predefined as actuating variable SRN being assumed to be that
value to which the foam channel level is to be regulated
constantly.
The feed whiteness sensor 24 for the detection of the feed
whiteness can be measured via the reflection factor of the
fibrous stock suspension at various wavelengths, in particular
at a critical wavelength of 457 nm. For this purpose, the
reflections are measured at various wavelengths of light-emitting
diodes, in particular in the wavelength ranges of the colors
red, green, blue and infrared. From the reflection values
determined in this way, the current value of the feed whiteness
can then be determined.
Furthermore, via one or mor« sensors 23 which are arrangecJ on the
flotation ceil 2Q, the controi unit 22 receives further
measured values which, for example* determine the levels of the
flotation cells 20, the flows between the flotation cells 20 in
the case of a plurality of flotation cells 20, and also further
parameters* in particular stock parameters, and provide these to
the control unit 23. On the basis of these values, the control
unit 22 calculates the optimum settings for the operation of the
flotation cell 20 (for example with the aid of a data-based
model). The determination of the suitable actuating variable SRN
can be carried out with the aid of a functional relationship
between the feed whiteness and the measured parameters and also
with the aid of an implemented lookup table.
FiQure 4 illustrates a block diagram of a further embodiment of
a deinking installation (regulated to intended whiteness).
Identical designations correspond to identical functional units.
in addition to the control unit 22, as illustrated in figure 3, a
regulating unit 28 is provided which, by using the accepts
whiteness, that is to say the whiteness of the fibrous stock
suspension in the discharge from the flotation ceil 20, with the
intended whiteness SW. that is to say the desired value of the
accepts whiteness which has been provided to the control unit
22» determines a regulation value RW. The actuating variable SRN
has the regulation value RW applied to it. In this caset the
regulation value RW can be added to« multiplied by or combined
with the actuating variable in another way. The regulating unit
28 generates the regulation value RW in such a way that, in the
event of a deviation between the accepts whiteness and the
desired whiteness, a regulation value RW is determined as a
corrective value which adapts the magnitudes of the actuating
variable aRW so as to set the foam channel level in such a way
that the accepts whiteness is changed in the direction of the
desired whiteness.
The accepts whiteness is determined fay an accepts whiteness
sensor 29, which is operated in substantially the same way as the
feed whiteness sensor 24 and supplies a value of the whiteness of
the accepts to the regulating unit 28.
The regulating unit 28 is preferably designed as a PI controller
and can have dead-time compensation which takes into account the
passage time of the fibrous stock suspension through the
flotation cell.
In figure b, in addition to the control unit and to the
regulating unit according to the embodiment of figure 4, an
adaption unit is added* which generates adaptation values with
the aid of which the system model integrated in the control unit
can be modified. The adaptation unit obtains the feed whiteness
from the feed whiteness sensor 24, values of parameters in the
flotation cell 20 from the sensors 25, and the accepts whiteness
from the accepts whiteness sensor 29.
These are used to determine one or more adaptation values,
which are applied to the model implemented in the control unit
22.
The adaptation unit 30 can be implemented together with the
control unit 22 and include many and various adaptation
methods, for example fuzzy adaptation, adaptation using neural
networks or the like. The adaptation unit 30 preferably takes
into account the passage time of the fibrous stock suspension
through the flotation cell and is substantially configured to
compensate for long-term or permanent deviations between the
desired and measured accepts whiteness. The adaptation can be
carried out, for example, either by the model being changed or by
an offset between the desired accepts whiteness and the measured
accepts whiteness being integrated and added to the actuating
variable.

WE CLAIM!
1. A method for regulating whiteness of printing ink removal in
a deinking installation! in which printing ink particles in
a fibrous stock suspension being removed in a flotation cell
(20) by means of the bubbles^ the removal being carried out
by discharging the foam forming into a foam channel« the
quantity of foam discharged being adjusted, the method
comprising the steps ofs
- measuring a feed whiteness of the fibrous stock
suspension fed in;
- measuring an accepts whiteness of the fibrous stock
suspension discharged;
- determining an actuating variable as a function of the
feed whiteness and a predetermined desired value for an
accepts whiteness of the fibrous stock suspension
discharged; characterized by comprising:
- determining a regulation value as a function of the
desired value for the accepts whiteness and the measured
accepts whiteness of the fibrous stock suspension
discharged;
- applying the regulation value to the actuating variable
in order to compensate for a deviation of the accepts white-
ness from the desired value; and
- setting the quantity of foam discharged as a function
of the actuating variable.
2_^ The method as claimed in claim It wherein the quantity
of foam discharged being carried out by setting a foam
channel level, in particular with the aid of foam
channel level regulation.
-j_ The method as claimed in claim 2, wherein the foam
channel level being set by the control of the quantity
of fibrous stock suspension drained off from the flotat-
ion eel1 (20).
^ The method as claimed in one of claims 1 to 3, wherein
the parameters of the fibrous stock suspension being
measured and the determination of the actuating
variable being carried out as a function of the
parameters of the fibrous stock suspension in the
flotation ceil (20).
5. The method as claimed in one of claims 1 to 4, wherein
the determination of the actuating variable beint
carried out by using a functional relationship and/or I
using a lookup table.
6. The method as claimed in claims 1 to 5» wherein the
regulation value being determined with the aid of a PI
controller.
7- The method as claimed in one of claims 1 to 6) wherein
the actuating variable having one or more adaptatioi
values applied to it.
8. The method as claimed in claim 7, wherein the
adaptation value being determined in an adaptatioi
method as a function of the feed whiteness* the accepti
whiteness and/or the parameters.
V. The method as claimed in claim 8j wherein the adaptat-
ion being carried out fay an offset between the desired
value of the accepts whiteness and the measured accept'
whiteness being integrated and added to the actuating
variable.
IQ. A deinking installation having a flotation cell {20)
tor printing ink removal* and comprising :
- a feed line (21) in order to lead a fibrous stock
suspension into the flotation cell;
- an accepts line suspension out of the flotation cell;
a foam channel to accommodate foam which is produced as
a result of the removal of printing ink particles from the
fibrous stock suspension with the aid of gas bubbles? the
quantity of foam discharged being adjustable;
a feed whiteness sensor (24) in order to measure the
feed whiteness of the fibrous stock suspension;
a control unit (22) in order to determine an actuating
variable (SRN) as a function of the measured feed whiteness
and a predefined desired value for an accepts whiteness of
the fibrous stock suspension discharged;
- an accepts whiteness sensor to measure the accepts
whiteness of the fibrous stock suspension discharged; and
— a whiteness regulating unit (28) in order to generate
a regulation value as a function of the desired value of the
accepts whiteness and the measured accepts whiteness and in
order to apply the regulation value to the actuating
variable) the control unit (22) setting the quantity of foam
discharged as a function of the actuating variable to which
the regulating value is applied.
11. The deinking installation as claimed in claim IQi
comprising a sensor (25) in order to measure one or
more parameters of the fibrous stock suspension such
that the actuating variable can be adjusted in the
control unit (22) as a function of the parameters.
12. The deinking installation as claimed in claim lO or 11,
wherein the quantity of foam discharged being
adjustable via the foam channel level, and wherein a
foam channel level regulating unit being provided in
order to regulate the foam channel level by regulating
an accepts flow through the accepts line in accordance
with a desired foam channel level.
13. The deinking installation as claimed in one of claims
lO to 12» comprising an adaptation unit (30) in order
to generate an adaptation value as a function of the
deviation of the desired accepts whiteness and the
measured accepts whiteness and in order to apply the
adaptation value to the actuating variable.
14. The deinking installation as claimed in claim 13»
wherein the adaptation unit being configured in such a
way as to generate an adaptation value by an offset
between the desired value of the accepts whiteness and
the measured accepts whiteness being integrated and
added to the actuating variable.


The invention relates to a method for regulating whiteness for removal of printing ink in deinking installations, whereby printing ink particles in a fiber suspension are removed in a flotation cell (20) by means of gas bubbles. Said
removal is carried out by removing the foam produced in a foam gutter (11), the amount of foam removed being adjusted. The method comprises the steps of measuring (24) a feed whiteness (ZW) of the fiber suspension added;
determining an adjustable variable (SRN) as a function of the feed whiteness (ZW) and a predetermined desired value (SW) for an acceptor whiteness of the removed fiber suspension (26); adjusting the quantity of the removed foam subject to the adjustable variable (SRN).

Documents:

00938-kolnp-2006 assignment.pdf

00938-kolnp-2006 astract.pdf

00938-kolnp-2006 claims.pdf

00938-kolnp-2006 correspondence others.pdf

00938-kolnp-2006 description (complete).pdf

00938-kolnp-2006 drawings.pdf

00938-kolnp-2006 form-1.pdf

00938-kolnp-2006 form-2.pdf

00938-kolnp-2006 form-3.pdf

00938-kolnp-2006 form-5.pdf

00938-kolnp-2006 international publication.pdf

00938-kolnp-2006 international search authority report.pdf

00938-kolnp-2006 others.pdf

00938-kolnp-2006 pct form.pdf

00938-kolnp-2006 priority document.pdf

00938-kolnp-2006-correspondence others-1.1.pdf

00938-kolnp-2006-priority document-1.1.pdf

938-KOLN-2006-ABSTRACT 1.1.pdf

938-KOLN-2006-CLAIMS 1.1.pdf

938-KOLN-2006-DESCRIPTION COMPLETE 1.1.pdf

938-KOLN-2006-OTHERS 1.1.pdf

938-KOLN-2006-PRTITION UNDER RULE 137.pdf

938-KOLN-2006-REPLY TO EXAMINATION REPORT.pdf

938-KOLNP-2006-06-09-2012-FORM-27.pdf

938-KOLNP-2006-FORM-27.pdf

938-kolnp-2006-granted-abstract.pdf

938-kolnp-2006-granted-claims.pdf

938-kolnp-2006-granted-correspondence.pdf

938-kolnp-2006-granted-description (complete).pdf

938-kolnp-2006-granted-drawings.pdf

938-kolnp-2006-granted-examination report.pdf

938-kolnp-2006-granted-form 1.pdf

938-kolnp-2006-granted-form 18.pdf

938-kolnp-2006-granted-form 2.pdf

938-kolnp-2006-granted-form 3.pdf

938-kolnp-2006-granted-form 5.pdf

938-kolnp-2006-granted-gpa.pdf

938-kolnp-2006-granted-reply to examination report.pdf

938-kolnp-2006-granted-specification.pdf

938-kolnp-2006-granted-translated copy of priority document.pdf

abstract-00938-kolnp-2006.jpg


Patent Number 240551
Indian Patent Application Number 938/KOLNP/2006
PG Journal Number 21/2010
Publication Date 21-May-2010
Grant Date 17-May-2010
Date of Filing 17-Apr-2006
Name of Patentee SIEMENS AKTIENGESELLSCHAFT
Applicant Address WITTELSBACHERPLATZ 2, 80333 MUNCHEN
Inventors:
# Inventor's Name Inventor's Address
1 MARKUS DINKEL TANNECKSTR. 7 87745 EPPISHAUSEN
2 RAINER PALM REISINGER STR. 19 80337 MÜNCHEN
3 THOMAS RUNKLER Luderitzstr 14 81929 MunchenLUDERITZSTR. 14 81929
4 THOMAS SCHMIDT KELTENWEG 32 86842 TÜRKHEIM
5 KLAUS VILLFORTH MOZARTSTR. 18 64342 SEEHEIM-JUGENHEIM
6 REINHOLD GÖTZ THEATERPLATZ 17 91054 ERLANGEN
PCT International Classification Number D21B 1/32
PCT International Application Number PCT/EP2004/012141
PCT International Filing date 2004-10-27
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 103 50 073.1 2003-10-27 Germany