DESCRIPTION
Title
Roller mill for extracting sugar cane juice
Background of the invention
The invention relates to a roller mill for extracting sugar cane juice from sugar cane thereby
obtaining bagasse, said roller mill comprising a first roller arranged to rotate about a first rota-
tion axis, a second roller arranged to rotate about a second rotation axis and a reabsorption
limiting unit for limiting reabsorption of juice by the bagasse discharged from a roller gap be-
tween the first roller and the second roller, wherein the reabsorption limiting unit includes a
first portion and a second portion which form an anti-expansion channel for receiving ba-
gasse and subjecting it to pressure.
Such roller mills are typically employed in sugar plants. In sugar plants sugar cane is at first
fed to preparatory devices, e g. fibrizers and/or shredders, which prepare the sugar cane by
opening the cells Then, the prepared sugar cane is usually fed to roller mills which extract
sugar cane juice from the prepared sugar cane The remaining biomass discharged from the
roller mills is called bagasse and may be used for generation of electrical power.
A roller mill of the above mentioned type is described in AU 2007 344 369 B2. This roller mill
includes a first top roller and a second bottom roller revolving in opposite directions for press-
ing sugar cane in the gap between the first and second rollers, Both the first and second roll-
ers are mounted with a fixed spacing to rotate about first and second rotation axes. Thus,
sugar cane juice is extracted from the supplied sugar cane using a roller gap of fixed size As
the pressure subjected to the discharged bagasse is less than the pressure in the roller gap,
it may be observed that the extracted juice is partially absorbed by the discharged bagasse,
In order to limit such reabsorption of juice by the bagasse, the known roller mill further in-
cludes a reabsorption limiting unit. This reabsorption limiting unit comprises an anti-
expansion channel which is formed by a top portion arranged close to the top roller and a
bottom portion arranged close to the bottom roller. The bagasse discharged from the roller
gap is received in between the top and bottom portion of the channel and pressurized in or-
der to limit juice reabsorption,

However, in order to receive optimal extraction results, the known roller mill is required to be
fed with sugar cane feedstock of constant thickness Thus, the roller mill may preferably be
operated with constant sugar cane throughput.
Summary of the invention
It is an object of the present invention to enable extraction of juice from sugar cane feedstock
of varying thickness and/or varying quantity while subjecting it to specified pressure in the
roller gap and reducing remaining bagasse moisture.
According to a first aspect of the present invention a roller mill for extracting sugar cane juice
from sugar cane thereby obtaining bagasse is described, said roller mill comprising a first
roller arranged to rotate about a first rotation axis, a second roller arranged to rotate about a
second rotation axis and a reabsorption limiting unit for limiting reabsorption of juice by the
bagasse discharged from a roller gap between the first roller and the second roller, wherein
the reabsorption limiting unit includes a first portion and a second portion which form an anti-
expansion channel for receiving bagasse and subjecting it to pressure, wherein the first roller
is mounted floating with respect to the second roller and the first portion of the reabsorption
limiting unit is mounted floating with respect to the second portion, wherein the first portion is
coupled to the first roller so as to follow a floating movement of the first roller.
According to another aspect of the present invention a method for operating a roller mill for
extracting sugar cane juice from sugar cane thereby obtaining bagasse is presented, said
roller mill comprising a first roller arranged to rotate about a first rotation axis, a second roller
arranged to rotate about a second rotation axis and a reabsorption limiting unit for limiting
reabsorption of juice by the bagasse discharged from a roller gap between the first roller and
the second roller, wherein the reabsorption limiting unit includes a first portion and a second
portion which form an anti-expansion channel for receiving bagasse and subjecting it to
pressure, wherein the first roller is floating with respect to the second roller and the first por-
tion of the reabsorption limiting unit is floating with respect to the second portion, wherein the
first portion is following the floating movement of the first roller.
By mounting the first roller floating with respect to the second roller, the roller mill is enabled
to automatically adapt the roller gap to the amount and/or thickness of the sugar cane fed
into the roller gap. Thus, sugar cane throughput may be varied during operation of the roller
mill. In the inventive roller mill the first portion of the reabsorption limiting unit is mounted
floating with respect to the second portion. Further, the first portion is coupled to the first roll-

er so as to follow the floating movement of the first roller. Thereby, the cross section of the
anti-expansion channel may be automatically adapted to a variation of the roller gap As a
result, the reabsorption limiting unit is capable of reducing bagasse moisture for varying sug-
ar cane throughput,
Preferably, the first roller is a top roller and the second roller is a bottom roller arranged be-
low the top roller. In such a configuration the first roller is subject to gravitational forces that
press the first roller in the direction of the second roller. Accordingly, the first portion of the
reabsorption limiting unit is a top portion and the second portion of the reabsorption limiting
unit is a bottom portion arranged below the top portion. According to an alternative embodi-
ment, the first roller is a bottom roller and the second roller is a top roller arranged above the
bottom roller. In this alternative embodiment the first portion of the reabsorption limiting unit
is a bottom portion and the second portion is a top portion arranged above the bottom por-
tion.
According to a preferred embodiment of the invention the first roller is loaded with a force
directed towards the second roller by a roller actuator The roller actuator allows setting the
pressure in the roller gap to a predetermined value Thereby, it is possible to control the
pressure in the roller gap, preferably by a closed loop control. Preferably the roller actuator is
a hydraulic roller actuator. In an embodiment in which the first roller is a top roller a gravita-
tional force component adds to the force provided by the roller actuator so that the roller ac-
tuator can be operated with reduced energy consumption.
Preferably, the first portion of the reabsorption limiting unit is mounted on a supporting
bracket, wherein the supporting bracket is loaded with the force directed towards the second
roller by the roller actuator By loading both the first roller as well as the supporting bracket
holding the first portion of the reabsorption limiting unit with a common force, movement of
the first roller and the first portion towards the second roller may be advantageously coupled,
It is particularly preferred if the supporting bracket is fixed to a pressure transfer assembly,
e.g. a pressure plate, that transfers the force of the actuator onto the first roller, in particular
onto a bearing of the first roller. Alternatively, the supporting bracket may be formed integral-
ly with the pressure transfer assembly.
According to a preferred embodiment of the invention the first portion of the reabsorption
limiting unit comprises a first scraper for scraping bagasse from the first roller Alternatively
or additionally the second portion of the reabsorption limiting unit comprises a second scrap-
er for scraping bagasse from the second roller The first and/or second scrapers may scrape

bagasse from the rollers and guide the bagasse in between the first and second portions of
the reabsorption limiting unit
In a preferred embodiment of the invention the first portion of the reabsorption limiting unit is
rotatably mounted, thereby allowing at least slight rotational movement of the first portion of
the reabsorption limiting unit in relation to the first roller. Preferably, the first portion is rotata-
bly mounted on the supporting bracket which is loaded with the force of the roller actuator.
It is further preferred that the first portion of the reabsorption limiting unit is loaded with a
force directed towards the first roller, preferably by a first spring element The first spring el-
ement may rotate the first portion of the reabsorption limiting unit, in particular a first scraper
arranged on the first portion, towards the first roller Thereby, the contact between the first
portion, in particular the first scraper, and the first roller may be improved.
According to a particular preferred embodiment the first spring element is arranged to oper-
ate a first lever coupled with the first portion of the reabsorption limiting unit for co-rotation,
The first lever may allow to amplify a small force of the first spring element to a large force
exerting on the first roller. Preferably the first spring element contacts the lever at a larger
distance from a rotational centre of both the first lever and the first portion than the distance
between the rotational centre and the point at which the first portion contacts the first roller
It is further preferred that the second portion of the reabsorption limiting unit is rotatably
mounted, thereby allowing at least slight rotational movement of the second portion of the
reabsorption limiting unit in relation to the second roller. Preferably, the second portion is
rotatably mounted on a frame of the roller mill The frame of the roller mill may both hold the
second roller as well as the second portion of the reabsorption limiting unit
It is further preferred that the second portion of the reabsorption limiting unit is loaded with a
force directed towards the second roller, preferably by a second spring element The second
spring element may rotate the second portion of the reabsorption limiting unit, in particular a
second scraper arranged on the second portion, towards the second roller, Thereby, the con-
tact between the second portion, in particular the second scraper, and the second roller may
be improved,
According to a particular preferred embodiment the second spring element is arranged to
operate a second lever coupled with the second portion of the reabsorption limiting unit for
co-rotation. The second lever may allow to amplify a small force of the second spring ele-

ment to a large force exerting on the second roller Preferably second first spring element
contacts the lever at a larger distance from a rotational centre of both the second lever and
the second portion than the distance between the rotational centre and the point at which the
second portion contacts the second roller.
It is further preferred that the second rotation axis of the second roller is fixed relative to a
frame of the roller mill.
According to a preferred embodiment of the invention the first portion of the reabsorption
limiting unit comprises a main part arranged on a side of the first portion facing the first roller
and a back part arranged on a side of the first portion away from the first roller, wherein the
back part is pivotably coupled to the main part
It is particularly preferred that the back part is connected to a back part actuator, preferably a
hydraulic back part actuator. The back part actuator allows to pivot the back part of the first
portion relative to the main part of the first portion A first end of the back part actuator may
be connected to the frame of the roller mill and a second end may be connected to the back
part of the first portion.
According to a preferred embodiment of the invention a mounting position of the first portion
of the reabsorption limiting unit on the supporting bracket is modifiable, preferably by insert-
ing one or more packing plates in between the supporting bracket and the first portion; and/or
that a mounting position of the second portion of the reabsorption limiting unit on a frame of
the roller mill is modifiable, preferably by inserting one or more packing plates in between the
frame and the second portion Thereby potential wear of the first and/or second rollers as
well as the first and/or second portions of the reabsorption limiting unit may be compensated.
These and other aspects of the invention will be apparent from and elucidated with reference
to the embodiment described hereinafter,
Brief description of the drawings
Fig. 1 shows a side elevation of a roller mill in accordance with an embodiment of the inven-
tion
Fig. 2 shows a first sectional view of the roller mill according to Fig. 1.

Fig. 3 shows a second sectional view of the roller mill according to Fig 1.
Fig. 4 shows sectional view of the assembly for holding the upper portion of the reabsorption
limiting unit in the roller mill according to Fig. 1.
Fig. 5 shows a sectional view of the assembly holding the lower portion of the reabsorption
limiting unit in the roller mill according to Fig 1
Fig. 6 shows a sectional view of the assembly for actuating the back part of the upper portion
of the reabsorption limiting unit in the roller mill according to Fig. 1.
Detailed description of the drawings
The present invention will be described with respect to a particular embodiment and with
reference to the drawings but the invention is not limited thereto but only by the claims. The
drawings described are only schematic and are non-limiting In the drawings, the size of
some of the elements may be exaggerated and not drawn on scale for illustrative purposes
Where an indefinite or definite article is used when referring to a singular noun, e g "a", "an",
"the", this includes a plural of that noun unless something else is specifically stated.
Furthermore, the terms first, second, third and the like in the description and in the claims are
used for distinguishing between similar elements and not necessarily for describing a se-
quential or chronological order It is to be understood that the terms so used are inter-
changeable under appropriate circumstances and that the embodiments of the invention de-
scribed herein are capable of operation in other sequences than described or illustrated
herein
Fig. 1 illustrates a roller mill 1 according to an embodiment of the invention The roller mill 1
is used for extracting juice from sugar cane in a sugar plant The roller mill 1 is fed with sugar
cane which has been prepared by heavy-duty shredders and fibrizers so that approximately
90% of the cells are already open prior to feeding the sugar cane to the roller mill 1 Using
the roller mill 1 juice is extracted from the sugar cane and bagasse is discharged. The ba-
gasse is collected and may be used as biomass for power generation. The roller mill 1 may
either be used as a sole mill or in a serial milling process including several mills. In serial
configuration the roller mill 1 may be a first mill, a last mill or an intermediate mill of the serial
configuration of mills. In case the roller mill 1 is employed as a first mill, feeding of sugar

cane may be done via a Donnelly chute and an under feed roller or via pressure feeder roll-
ers,
The roller mill 1 comprises a first, top roller 9 arranged to rotate about a first rotation axis X1
and a second, bottom roller 10 arranged to rotate about a second rotation axis X2 The first
roller 9 is arranged above the second roller 10 The first roller 9 and the second roller 10 are
configured to rotate in opposite directions R1, R2 so as to draw sugar cane in from a first
side depicted left in Fig. 1, Thereby, sugar cane, preferably in the form of a prepared blanket,
is moved in a feed direction F towards the roller gap 11 between the first roller 9 and the se-
cond roller 10 At the roller gap 11 sugar cane is pressed between the first roller 9 and the
second roller 10 thereby extracting sugar cane juice from the pressed sugar cane. The re-
maining matter, called bagasse, is leaving the roller gap 11 in the feed direction F.
The roller mill 1 further features a reabsorption limiting unit 20 for limiting reabsorption of
juice by the bagasse discharged from the roller gap 11 The reabsorption limiting unit 20 in-
cludes a first portion 21 and a second portion 22 which form an anti-expansion channel 26
for receiving bagasse and subjecting it to pressure. The first portion 21 is formed as a top
portion and the second portion 22 is a bottom portion arranged below the first port.on 21. In
operation of the roller mill 1, the first portion 21 and the second portion 22 pressurize the
bagasse and keep it compressed so as to hinder reabsorption of sugar cane juice by the
discharged bagasse. Thereby, the amount of moisture in the bagasse is reduced. Further
details of the reabsorption limiting unit 20 will be discussed below. In the example of Fig. 1
the first and second portions 21, 22 each comprise a plate for subjecting the bagasse with
pressure.
In order to enable extraction of juice from sugar cane feedstock of varying thickness and/or
varying quantity while subjecting it to specified pressure in the roller gap 11 and reducing
remaining bagasse moisture the first roller 9 is mounted floating with respect to the second
roller 10 and the first portion 21 of the reabsorption limiting unit 20 is mounted floating with
respect to the second portion 22. In addition, the first portion 21 is coupled to the first roller 9
so as to follow a floating movement of the first roller 9. Hence, roller mill 1 is enabled to au-
tomatically adapt the roller gap 11 to the amount and/or thickness of the sugar cane fed into
the roller gap 11 Further, the cross section of the anti-expansion channel 26 is automatically
adapted to a variation of the roller gap 11 As a result, the reabsorption limiting unit 20 is ca-
pable of reducing bagasse moisture even if sugar cane throughput varies during operation of
the roller mill 1.

The floating arrangement of the first roller 9 with respect to the second roller 10 will be de-
scribed with reference to Fig. 2 and Fig. 3 in the following, The roller mill 1 comprises two
frames 2, also referred to as headstocks, for mounting the first and second rollers 9, 10.
The first roller 9 has two ends which are connected to a first bearing 7 each Similarly, the
second roller 10 has two ends which are connected to a second bearing 8 each. The second
bearings 8 are fixed to a frame 2 of the roller mill 1 in order to fix the second rotational axis
X2 of the second roller 10 to the frame 2 during operation of the roller mill 1. However, a po-
sition adjustment device may be included in the roller mill 1 for setting the operational posi-
tion of the second roller 10 in relation to the frame 2 With such position adjustment device
the position, in particular the height, of the second roller 10 may be adjusted when the roller
mill 1 is not in operation.
The first bearings 7 are floatingly mounted in the frames 2. In other words, the bearings 7
may move up and down inside the frames 2 along a linear trajectory, which is preferably in-
clined with respect to a vertical direction Thus, the first roller 9 is floatingly mounted in the
frames 2. The first roller 9 is loaded with a force directed towards the second roller 10 by two
roller actuators 4. In the embodiment shown in the figures, the roller actuators 4 are hydraulic
actuators The roller actuators 4 are mounted in a top cap 3 each. Each of the top caps 3 is
arranged on top of one of the frames 2 of the roller mill 1. The top caps 3 are fixed to the
frames 2 with connection elements 5 in the form of pins.
A pressure transfer assembly 6 is arranged in each of the two frames 2 of the roller mill 1.
The pressure transfer assembly 6 comprises a pressure plate which is floatingly mounted in
the frame 2 in contact with the roller actuator 4 The roller actuator 4 exerts a hydraulic force
on a first surface of the pressure transfer assembly 6 On a second surface, opposite the first
surface, the pressure transfer assembly is in contact with the first bearing 7 which holds the
first roller 9. Thus, the hydraulic force exerted by the roller actuator 4 is transferred to the first
roller 9 via the pressure transfer assembly 6 and the first bearing 7. Thus, the first, upper
roller 9 Is floating and held from above only by the force of the roller actuator 4, e g. a hy-
draulic force, Optionally, the roller actuator 4 may be controlled to exert a predefined force on
the sugar cane in the roller gap 11.
With continued reference to Fig. 1 the mounting arrangement of the reabsorption limiting unit
20 will be described in the following Similar to the arrangement of the first roller 9, the first
portion 21 of the reabsorption limiting unit 20 is floatingly mounted in the roller mill 1 A first

supporting bracket 23 is fixed to the pressure transfer assembly 6, preferably bolted to a
pressure plate of the pressure plate assembly 6, Thereby, the first supporting bracket 23 is
loaded with the force of the roller actuator 4 which is directed towards the second, bottom
roller 10,
The first portion 21 of the reabsorption limiting unit 20 is rotatably mounted on the first sup-
porting bracket 23 Therefore, a flanged bearing 24 is provided on the first supporting bracket
23. An axle assembly 25 is connected to the flanged bearing 24 so as to allow a rotation of
the axle assembly 25 in relation to the first supporting bracket 23. The axle assembly 25 is
fixed to the first portion 21 of the reabsorption limiting unit 20. That means that axle assembly
25 and first portion 21 are able to rotate together in relation to the first supporting bracket 23.
A first, top scraper 31 is connected to the first, top portion 21, in particular on a side of the
first portion 21 that is adjacent the first roller 9. Using the first scraper 31 bagasse may be
scraped from the first roller 9, in particular from grooves provided in the surface of the first
roller 9 The scraped bagasse is guided between the first and second portions 21, 22 of the
reabsorption limiting unit 20 The first and second portion 21, 22 are arranged in such a
manner that they form a divergent anti-extension channel 26. In the divergent anti-expansion
channel 26 the height between the first portion 21 and the second portion 22 increases in the
direction of flow of the bagasse. In other words, the height of the anti-expansion channel 26
increases starting form a minimum inlet height A at the side of the reabsorption limiting unit
20 adjacent the rollers 9, 10 to an increased outlet height B at the opposite side of the chan-
nel 26. Thereby, the pressure on the bagasse in the anti-expansion channel 26 is kept just
enough so the bagasse is not able to expand feely Reabsorption of extracted juice by the
bagasse is thus minimized without hampering the ability of the bagasse to move away from
the roller gap 11
The first portion 21 includes a tensioning arrangement for pressing the first portion, in par-
ticular the first scraper 31 of the first portion 21, against the first roller 9. As illustrated in Fig.
1 and Fig. 4 a first lever 27 is coupled with the first portion 21 unit for co-rotation The first
lever 27 is contacted by a first spring element 28 1 of a first stud and spring assembly 28.
The first stud and spring assembly comprises a first stud 28 2 and the first spring element
28.1. The first stud and spring assembly 28 is coupled to the first lever 27 and to a second
supporting bracket 29 which is fixed to the first supporting bracket 23 for co-rotation. Via the
first lever 27 the force of the first spring element 28.1 is amplified to a large force exerting on
the first roller 9. Therefore, the first spring element 28 1 contacts the first lever 27 at a larger
distance from the rotational centre, namely the axle assembly 25, of both the first lever 27

and the first portion 21 than the distance between the rotational centre and the point at which
the first portion 21 contacts the first roller 9.
The second portion 22 of the reabsorption limiting unit 20 is rotatably mounted in a bearing
34 fixed on a third supporting bracket 35, The third supporting bracket 35 is mounted on the
frame 2 of the roller mill 1. A second, bottom scraper 32 is connected to the second, top por-
tion 22, in particular on a side of the second portion 22 that is adjacent the second roller 10.
Using the second scraper 32 bagasse may be scraped from the second roller 10, in particu-
lar from grooves provided in the surface of the second roller 10
Another tensioning arrangement is provided at the second portion 22 of the reabsorption
limiting unit 20. As depicted in Fig. 1 and Fig. 5 a second lever 30 is coupled with the second
portion 22 of the reabsorption limiting unit 20 for co-rotation. The second lever 30 is contact-
ed by a second spring element 33 1 of a second stud and spring assembly 33 The second
stud and spring assembly comprises a second stud 33 2 and the second spring element
33 1, The second stud and spring assembly 33 is coupled to the second lever 30 and to a
hinged pin 38 fixed at the frame 2 of the roller mill 1 Via the second lever 30 the force of the
second spring element 33 1 is amplified to a large force exerting on the second roller 10.
Therefore, the second spring element 33 1 contacts the second lever 30 at a larger distance
from the rotational centre of both the second lever 30 and the second portion 22 than the
distance between the rotational centre and the point at which the second portion 22 contacts
the second roller 10.
As further apparent from Fig. 1, the first portion 21 of the reabsorption limiting unit 20 com-
prises a main part 21 1 arranged on a side of the first portion 21 facing the first roller 9 and a
back part 21 2 arranged on a side of the first portion 21 away from the first roller 9, wherein
the back part 21 2 is pivotably coupled to the main part 21 1. The back part 21.2 is connect-
ed to a back part actuator 39, preferably a hydraulic back part actuator, see Fig. 6. The back
part actuator 39 allows to pivot the back part 21 2 of the first portion 21 relative to the main
part 21 1 of the first portion 21. A first end of the back part actuator 39 is connected to the
frame 2, in particular via a fourth supporting bracket 40 fixed to the frame 2, and a second
end is connected to the back part 21 2 of the first portion 21 In the embodiment presented
here, both the main part 21.1 and the back part 21,2 comprise a plate for pressurizing the
bagasse discharged from the roller gap 11
In this embodiment of the roller mill 1 a mounting position of the first portion 21 of the reab-
sorption limiting unit 20 on the first supporting bracket 23 is modifiable by inserting one or

more packing plates 37 between the first supporting bracket 23 and the first portion 21, in
particular between the flanged bearing 24 connected to the first supporting bracket 23 and
the first portion 21, see Fig. 1 Thereby, it is possible to compensate for wear of the first por-
tion 21, in particular the first scraper 31 of the first portion 21, and/or wear of the first roller 9
Additionally, the mounting position of the second portion 22 of the reabsorption limiting
unit 20 on the frame 2 of the roller mill 1 is modifiable. One or more packing plates 36 can be
place in between the frame 2, in particular the third supporting bracket 35, and the second
portion 22. Thereby, it is possible to compensate for wear of the second portion 22, in partic-
ular the second scraper 32 of the second portion 22, and/or wear of the second roller 10.
In summary, the roller mill 1 presented above is suited for extracting sugar cane juice from
sugar cane thereby obtaining bagasse The roller mill 1 comprises a first roller 9 arranged to
rotate about a first rotation axis X1, a second roller 10 arranged to rotate about a second
rotation axis X2 and a reabsorption limiting unit 20 for limiting reabsorption of juice by the
bagasse discharged from a roller gap 11 between the first roller 9 and the second roller 10.
The reabsorption limiting unit 20 includes a first portion 21 and a second portion 22 which
form an anti-expansion channel 26 for receiving bagasse and subjecting it to pressure Ac-
cording to the invention the first roller 9 is mounted floating with respect to the second roller
10 and the first portion 21 of the reabsorption limiting unit 20 is mounted floating with respect
to the second portion 22, wherein the first portion 21 is coupled to the first roller 9 so as to
follow a floating movement of the first roller 9.

List of reference numerals
1 roller mill
2 frameyheadstock
3 top cap
4 roller actuator
5 connection element
6 pressure transfer element
7 bearing
8 bearing
9 roller
10 roller
11 roller gap

20 reabsorption limiting unit
21 portion

21.1 main part
21.2 back part

22 portion
23 supporting bracket
24 bearing
25 axle assembly
26 anti-expansion channel
27 lever
28 stud and spring assembly

28.1 spring element
28.2 stud

29 supporting bracket
30 lever
31 scraper
32 scraper
33 stud and spring assembly

33.1 spring element
33.2 stud
34 bearing

35 supporting bracket
36 packing plate
37 packing plate
38 hinged pin
39 actuator
40 supporting bracket
A inlet height of reabsorption limiting unit
B outlet height of reabsorption limiting unit
F feed direction
R1 direction of rotation
R2 direction of rotation
X1 rotation axis
X2 rotation axis

We Claim:

1. A roller mill for extracting sugar cane juice from sugar cane thereby obtaining ba-
gasse, said roller mill (1) comprising a first roller (9) arranged to rotate about a first ro-
tation axis (X1), a second roller (10) arranged to rotate about a second rotation axis
(X2) and a reabsorption limiting unit (20) for limiting reabsorption of juice by the ba-
gasse discharged from a roller gap (11) between the first roller (9) and the second
roller (10), wherein the reabsorption limiting unit (20) includes a first portion (21) and
a second portion (22) which form an anti-expansion channel (26) for receiving ba-
gasse and subjecting it to pressure,
characterized in that
the first roller (9) is mounted floating with respect to the second roller (10) and the first
portion (21) of the reabsorption limiting unit (20) is mounted floating with respect to
the second portion (22), wherein the first portion (21) is coupled to the first roller (9)
so as to follow a floating movement of the first roller (9).
2 A roller mill according to claim 1, characterized in that the first roller (9) is loaded with
a force directed towards the second roller (10) by a roller actuator (4), preferably by a
hydraulic roller actuator
3, A roller mill according to claim 2, characterized in that the first portion (21) of the re-
absorption limiting unit (20) is mounted on a supporting bracket (23), wherein the
supporting bracket (23) is loaded with the force directed towards the second roller
(10) by the roller actuator (4).
4, A roller mill according to any of the preceding claims, characterized in that the first
portion (21) of the reabsorption limiting unit (20) comprises a first scraper (31) for
scarping bagasse from the first roller (9) and/or the second portion (22) of the reab-
sorption limiting unit (20) comprises a second scraper (32) for scraping bagasse from
the second roller (10).
5, A roller mill according to any of the preceding claims, characterized in that the first
portion (21) of the reabsorption limiting unit (20) is rotatably mounted, preferably on
the supporting bracket (23),

6 A roller mill according to claim 5, characterized in that the first portion (21) of the re-
absorption limiting unit (20) is loaded with a force directed towards the first roller (9),
preferably by a first spring element (28.1).
7 A roller mill according to claim 6, characterized in that the first spring element (28 1)
is arranged to operate a first lever (27) coupled with the first portion (21) of the reab-
sorption limiting unit (20) for co-rotation.
B. A roller mill according to any of the preceding claims, characterized in that the second
portion (22) of the reabsorption limiting unit (20) is rotatably mounted, preferably on a
frame (2) of the roller mill (1).
9. A roller mill according to claim 8, characterized in that the second portion (22) of the
reabsorption limiting unit (20) is loaded with a force directed towards the second roller
(10), preferably by a second spring element (33.1).
10. A roller mill according to claim 9, characterized in that the second spring element
(33.1) is arranged to operate a second lever (30) connected to pivot with the second
portion (22) of the reabsorption limiting unit (20).
11. A roller mill according to any of the preceding claims, characterized in that the second
rotation axis (X2) is fixed relative to a frame (2) of the roller mill (1).
12. A roller mill according to any of the preceding claims, characterized in that the first
portion (21) of the reabsorption limiting unit (20) comprises a main part arranged on a
side of the first portion (21) facing the first roller (9) and a back part arranged on a
side of the first portion (21) away from the first roller (9), wherein the back part is
pivotably coupled to the main part,

13. A roller mill according to claim 12, characterized in that the back part is connected to
a back part actuator, preferably a hydraulic back part actuator.
14. A roller mill according to any of the preceding claims, characterized in that a mounting
position of the first portion (21) of the reabsorption limiting unit (20) on the supporting
bracket (23) is modifiable, preferably by inserting one or more packing plates (37) in
between the supporting bracket (23) and the first portion (21); and/or
that a mounting position of the second portion (22) of the reabsorption limiting unit

(20) on a frame (2) of the roller mill (1) is modifiable, preferably by inserting one or
more packing plates (36) in between the frame (2) and the second portion (22)
15. Method for operating a roller mill for extracting sugar cane juice from sugar cane
thereby obtaining bagasse, said roller mill (1) comprising a first roller (9) arranged to
rotate about a first rotation axis (X1), a second roller (10) arranged to rotate about a
second rotation axis (X2) and a reabsorption limiting unit (20) for limiting reabsorption
of juice by the bagasse discharged from a roller gap (11) between the first roller (9)
and the second roller (10), wherein the reabsorption limiting unit (20) includes a first
portion (21) and a second portion (22) which form an anti-expansion channel (26) for
receiving bagasse and subjecting it to pressure,
characterized in that
the first roller (9) is floating with respect to the second roller (10) and the first portion
(21) of the reabsorption limiting unit (20) is floating with respect to the second portion
(22), wherein the first portion (21) is following the floating movement of the first roller
(9).