Mixing Mill - A story of woes to wows!!

Updated Criterion Checklist To Select Your Two-Roll MillInside
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World
Rubber & Tyre Knowledge On-The-Go Special Supplement
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A New Generation Mill
FilePictureFromWiki
MIXING MILL
A Story Of
Wows!!Woes To

Two-Roll Mixing Mills have been in existence since the
time mixing of rubber started for various applications.
It is still a sacred machinery for the rubber processors.
Hence, we had to think thrice or even more before we
decided to write a feature on this machinery.
The theme ‘The Story of Woes To Wows!!’, I think, is a
true reflection of what this popular rubber machinery
has morphed into. Modern mixing mills are rich in
features, safe and automated as compared to ancestors.
(This edition’s cover page sums up this contrast well!).
Our first attempt at a concise Knowledge On-The-Go
special supplement was a success. Thanks to each of you
- esteemed readers and supportive advertisers, for
reposing faith in our abilities.
It’s fascinating to us, when you take your valuable time
to pen us your comments and shower generous words
of appreciation. The immediate result is what you see
here - our team is emboldened. We redesigned the cover
of our special supplement to differentiate our look,
articulate our approach better and more importantly,
reinforce our commitment to you.
At Rubber Machinery World, we understand your
information requirements and hence our efforts to share
authentic information on this portal to help you source
your machinery wisely is serious, I reassure you.
In this edition, we have also included from our portal, an
updated checklist to help you select the right mill.
As always, I welcome your feedback on
rubbermachineryworld@gmail.com.
BestRegards
Prasanth Warrier
| Editor’s Note |
Most Popular Rubber Machinery
We redesigned
the cover of our
special supplement
to differentiate our
look, articulate our
approach better
and reinforce our
commitment to you.
3
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Special Supplement - Rubber Machinery World SEP 2015|

4
File Image: A Mill Working Inside A Factory (Source: Wiki).
Special Supplement - Rubber Machinery World | SEP 2015
| MIXING MILL |

5
MIXING MILL
A Story Of Woes To Wows!!
Mixing Mills have been in
existence since the time
mixing of rubber started for
various applications.
Interestingly, the world's
first rubber factory was
established near Paris in 1803.
A Two-Roll Mill is the oldest
and simplest type of rubber
mixing machinery. You could
use these machines for
different processes such as
mixing, sheeting, plasticizing
and warming of the rubber.
Some applications include
using as Dump mills below an
internal mixer for compoundi-
ng and sheeting-out; Warm-up
and feed mills for calendars
and extruders; Re-mixing Plain
compounding and Mixing.
Despite its versatility, they
were extremely painful to
work with. Because a basic
mixing mill operation is dirty
and provides a poor working
environment that is equally
polluted. Lengthy mixing cycle
Prasanth Warrier
| MIXING MILL |

File Image Of An Operator working on a Mixing Mill at Dunlop Factory
leads to higher time
consumed. As a supervisor,
your productivity from this
equipment is dependent on
your operator skill. Cutting
down hot rubber many
times, rolling the sheets and
feeding them back into the
nip gap of the mill rolls is a
physically demanding task
for the operator. And from a
quality perspective, you
could have batch-to-batch
variations creating undesired
headache.
Veteran compounders who
have worked on mixing mill
will closely relate their
painful experiences to the
above statements. Nothing
could be farther than the
truth as the file picture on
this page clearly articulates
the woes of a mixing mill
operator inside a plant.
6
| MIXING MILL |

| MIXING MILL |
Mixing & Compounding
Operation:
When mixing on a mill, you
place the polymer between
the rolls. It is processed until
the polymer forms an even
belt around one of the rolls
with a certain amount of
excess compound on the top
crevice where the rolls meet.
You then add fillers, plastici-
zers and other chemicals
gradually to the “mixing
zone” between the rolls.
Some chemicals fall down
into the tray below the mill
rolls and your operator must
then collect it and feed back
into the mixing mill again.
Finally, when you have inco-
rporated all the non-curative
ingredients, curing agents
and accelerators are added.
The total mixing time often
is upto at least 30 minutes for
a batch size of approx 100 kg.
Opinion varies even today.
While everyone agrees that
good compounding requires
good dispersion, some argue
that good dispersion come
only with internal mixers.
While other users claim that
for a particular recipe, there’s
no better equipment than
mixing mill.
Says, Amardeep Singh
Bharaj, Director (Sales) of
leading rubber machinery
manufacturer, Bharaj
Machineries Pvt Ltd, “A
rubber mixing mill is no
more just a mere machine
with two rolls moving and
rubber going in, coming
out with flaws like
running on high torque
and consuming high units
of electricity and majorly
breakdowns due to Bushes
and Gears.”
It is in this context that
we track the modernizat-
ion or technology impro-
visations in mixing mills.
Modernization And
Technology Changes
With evolving times, the
manufacturers have
devised ways to address
8
the shortfalls of working
with mixing mills.
Says, Eldad Eilam, Co-CEO
of Pelmar Engineering
Limited, leading world-
wide suppliers of rubber
and tyre machinery, “The
industrial mixing mill may
have not significantly
changed over time from
design point of view. Yet, it
has introduced many
mechanical improvements
and electrical upgrades to
meet the on-going demand
coming from customer for
enhanced processing, safety
and automation.”
It is said familiarity breeds
contempt. And, hence this
could be a reason why we
consider two-roll mills as a
low technology product
and automatically assume
that anybody can
manufacture them.
Is this true?
A Mixing Operation On A Mill

| MIXING MILL |
Explains Amardeep Singh Bharaj, “Rubber Mixing mills
today are very smart and energy-efficient machines
providing highest levels of quality as required. The
whole perception has changed. Rubber mixing mills,
being the heart of rubber factory in terms of providing
rubber to ancillary equipments like calendars/extruders
/moulding presses, is taken very seriously in terms of
Rubber Mixing mills today are very
smart and energy-efficient machines
providing highest levels of quality
as required. The whole perception
has changed.
Amardeep Singh Bharaj
Director (Sales)
Bharaj Machineries Pvt. Ltd.
Image: A 60" Mixing Mill With Advanced Features,
Controls, and Automation from Bharaj Machineries.
9

Modern mills now have peripherally
drilled rolls for better cooling and
temperature control, bearings with
minimal friction, compact operator
friendly design which also saves
space, simple base frame for easy
installation, and hydraulic nip
adjustment for safety of machine
parts in the event of overload
| MIXING MILL |
of roll ratios for better mixing
quality, Rolls temperature
controlling systems for high
level quality controlling of
compounds, improved safety
features like emergency brakes
/auto reversing systems for
operator safety, precise button
operated nip gap adjustment
systems for perfect sheet
thickness, variable speed
drives for hard to process
compounds and fully
automated mixing cycles
through PLC and energy
graphs to analyse the power
consumption which makes
the user smart and
competitive to know where
one stands.”
Philip Thomas
Managing Director
Kelachandra Machines
10
Adds Philip Thomas,
Managing Director of
Kelachandra Machines,
“Modern mills now have
peripherally drilled rolls
for better cooling and
temperature control,
bearings with minimal
friction, compact operator
friendly design which
also saves space, simple
base frame for easy
installation, and hydraulic
nip adjustment for safety
of machine parts in the
event of overload”.
Kelachandra Machines
manufactures rubber
industrial machinery.
There are instances today in
the industry where two-roll
mills are not meeting the
expectations of the customers.
The fault lies on either side –
end users failed to draft the
technical specifications
properly and manufacturers
failed to understand the
expectations properly.
After all a two-roll mill is
only a two-roll mill, isn't it?
How complicated can it be?
The fact that each component
going into the mill needs to
maintain the physical and
dimensional integrity is taken

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| MIXING MILL |
for granted. Any mismatch can
lead to recurring problems
resulting in downtime and
causing loss of production.
Informs Eldad Eilam, “In
terms of processing, new drive
technologies, coupled with
peripherally drilled rolls are
used to enable processing of a
broader range of elastomeric
compounds by better control
of the temperature and ability
to make different compound
characteristic by easily
changing the friction.”
Let's examine a few
developments these leaders
are speaking of.
Drives
The new mills that are
manufactured today adopt
compact direct drive where
the gearbox output shaft is
coupled directly to the roll.
Bull gear-pinion that
consumed more power,
made noise and vibration
has become obsolete.
There are also uni-drives
where two output shafts
from the same gear-box
drive the two rolls. The
external connecting gears
are absent here making the mills appear more aesthetic
and compact.
Then, there are independently driven rolls where each
roll is connected to an individual gearbox taking power
from individual motors. The advantage is that variable
friction ratio can be obtained for different recipes.
A hydraulic drive is another upgrade that saves power
though comes with higher initial capital investment.
12
Image: Different Configurations of Independent Drive

| MIXING MILL |
Stock Blender:
In a discussion and exchange
of thoughts on this subject
recently on LinkedIn platform,
veteran compounders have
vouched on the “immense
value” a stock blender
provides to a mixing mill. Not
surprising, as Eldad Eilam
adds “Use of a stock blender
reduces dependence on
operator skills; provide better
and consistent productivity to
achieve the desired batch-to-
batch uniformity”.
A main disadvantage in
mixing on a two-roll mill is
that the process is dependent
on your operator skill.
A Stock blender enhances
efficiency and productivity
through reduced operator
fatigue because this accessory
eliminates the demanding
task of cutting down hot
rubber many times, rolling
the sheets and feeding them
back into the nip gap of the
mill rolls.
The operator also benefits
from a safe work
environment.
The Stock Blender is an add-
on accessory mounted on top
of an open two-roll mill.
13
It aids in rubber blending by pulling the mix compound
from the front roll of the mill and guiding it to the nip gap
between the two mill rolls.
A stock blender helps in homogeneous mixing and
repeatability of the mixing operations. They are also used
on pre-warming mills before feeding the rubber sheet to a
Calender.
Nip-gap Adjustment:
A motorized / hydraulically actuated nip-gap adjustment
Image: CE Certified 6"x13" Lab Mill with Variable Friction
Ratio, VSD, Digital Nip-Gap display and Temperature
Controlling Mechanism (By Bharaj Machineries)
Image: 84" Mixing Mill With Stock Blender from
Kelachandra Machines.

| MIXING MILL |
improves precision and
facilitate faster nip setting for
multiple recipes. This can
further be automated to have
'preset nip gaps 'obtained at
the press of a button on the
operator panel. Nip Gap can
be controlled / measured in
electronic devices.
Informs Sugundhan
Nagendhran, Solutions Head
of Base Automation
Technologies Private Ltd,
“We can monitor the nip gap
with suitable sensor installed
in the machine.”
Stock Guides
The movement of stock
guides can be made
pneumatically or
hydraulically actuated for
faster movement and
precision.
The shape of the stock guides
in such uses may be modified
to make the rubber flow
always to the centre of the
rolls so that the compound
does not seep sideways
prolonging the mixing
process further.
Rolls
Roll selection for a mixing
mill is of decisive importance
for the quality of many
high-tech products
manufactured by the
rubber industry.
Generally, these rolls are
made of Chilled Cast Iron
(CI) through a process of
vertical casting. Chilled CI
has greater resistance to
deflection and uniform
heat transfer
characteristics. Depending
on the presence or absence
of alloy, the hardness of the
outer working (chill) zone
could be in the range of
460-650 HV with a
thickness 12-20 mm.
As these rolls operate at
high speeds, precise
concentricity with proper
balancing of rolls is a pre-
requisite for efficient
utilization of material and
energy.
The surface quality of the
rolls is crucial for the
products to be produced.
The smoother and more
precise the rolls, better the
product.
Viscous deformation of the
rubber compounds occurs
between the rolls of mills
during mixing and
mastication. This generates
heat that needs to be
removed through effective
cooling. Hence, water
circulation passages for
cooling are an essential
feature of the roll design in
rubber mills.
14
We can monitor the nip gap with sensor
installed in the machine.
Sugundhan Nagendhran
Solutions Head
Base Automation Technologies Pvt Ltd
A Lab Mill From Pelmar

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| MIXING MILL |
These passages allow a pre-
defined circulation of the
cooling agent (mainly water)
and ensure that the
temperature can be kept
within a prescribed tolerance
over the entire face length of
the rolls.
Two designs are normally
available – centrally cored
rolls and peripherally drilled
rolls. Peripherally drilled
rolls are possible for
diameter greater than
150mm (or 6 inches).
The efficiency of heat
transfer is relatively higher
in the case of peripherally
drilled rolls than in centrally
cored rolls due to close
proximity of the water
channels to the roll surface.
In peripherally drilled rolls,
the passages for heat
exchange are provided
approximately 25mm under
the roll surface and can
vary nominally between
manufacturers.
The manufacturing
processes and costs involved
in producing a peripherally
drilled rolls is relatively
high, hence they are priced
higher than cored rolls.
Your choice of peripherally
drilled or cored rolls
depends on the quality of
rubber processing required
in mixing mills and the
marketability of your
rubber products for a price
16
The efficiency of heat transfer is relatively
higher in the case of peripherally drilled
rolls than in centrally cored rolls.
that profitably covers your
investment.
Safety
Various safety devices have
also been improved and
implemented in new mills
with special attention to
operator protection in mind.
Sugundhan Nagendhran,
cites “Whenever the
emergency switch is
pressed, the mill will rotate
in the reverse direction
(half circle) to avoid
hazards of crushing the
hand.”
Image: Mixing Mill Rolls (Courtesy: Web)

| MIXING MILL |
Automation and Integration
All your mechanical
improvements and add-ons
will benefit you best when
they are automated,
integrated and safe.
Depending on your
requirement a high level of
customization is possible.
Amardeep Singh Bharaj,
says “Automated PLC
features helps to analyse
mixing cycles and
productions time and this
makes the machine self
sufficient and not labour
intensive.”
While Sugundhan
Nagendhran adds
“Normally, in the mixing
mill the sheeting time of the
compound is left to the
operator; excess sheeting of
the compound will lead to
compound scorch; while less
sheeting will lead to
improper mixing. To avoid
this, the sheeting mixing
time can be monitored as per
the recipe sequence and once
the sheeting time is reached
the system will raise the
alarm to stop and guide the
operator to take the
compound.”
Today, there is integration
possible between the Master
Batch (MB) sheet addition
and Finals chemical addition
into the mixing mill.
Explains Sugundhan
further, “This means adding
the Final Batch (FB)
chemicals at the right time
and right step is very crucial
in the mixing. The FB
mixing system is integrated
such a way that, the system
will monitor the sheeting
time and record the KW
consumed and it will
indicate the correct step to
add the FB chemical to the
mill. To ensure the 100%
addition of chemical, the
event of taking the chemical
bag from the weighing scale
is recorded and a photo-
sensor will be deployed
above the mill to ensure the
operator have dropped the
chemical at the right step
and time.”
When you are considering
a mixing mill in a mixing
room, there are major
developments.
Image: Mixing Mill With Hydraulic Drive at PTE, Germany
Automated PLC features helps to analyse
mixing cycles and productions time and
this makes the machine self sufficient
and not labour intensive.
17

| MIXING MILL |
Explains, Ashutosh
Chincholikar, Business Head
of Smart Controls India Ltd,
“Mixing Mill Automation
today has gone a sea change
as compared to what was
available few years back.
Earlier, recipe-based
weighing and mixing was
considered something
ultimate. But now we talk of
a Mixing Room Automation.
This means it has moved to a
fully integrated system that
integrates the Carbon
Handling System, Mixer
upstream, Mixer, Mills and
the Batch off. Not only that,
we also have the labs
integrated in this solution as
well. Further, we have
Advanced Process Control
giving greater efficiency and
better batch to-batch
uniformity in spite of the
varying properties of the Raw
Material.”
This has helped the users in
terms of a more efficient and
integrated system that can be
completely managed from
one room.
Ashutosh Chincholikar
probably knows the best on
automation and integration,
because Smart Controls India
Ltd is pure integrators and
their solutions are based on
state of the art products from
Siemens. He further adds,
“We have an ability to
integrate almost any kind of
control system with our
Mixing Line Controls that is
based on Siemens platform.
The biggest advantage we
offer is that we are not
machinery suppliers. Yet we
18
understand the Mixing
Machinery very well, be it
Mixers or Upstream or Mills
or batch off. We possess
good skills on IT integration
as well. So the Mixing
solution can be connected to
the business platforms like
SAP or Oracle.”
Mixing mill integration with
Mixing Mill Automation today has gone a
sea change as compared to what was
available few years back. Earlier, recipe-
based weighing and mixing was
considered something ultimate. But now
we talk of a Mixing Room Automation.
Ashutosh Chincholikar
Business Head
Smart Controls India Ltd.

| MIXING MILL |
other machinery like
mixer and batch-off is easy
and affordable. However
there are challenges. Says,
Ashutosh Chincholikar,
“Lot of decisions at the user
end need to be taken
correctly. But in general,
there are two options
available with the user.
First option is to engage one
single company that takes
the total responsibility of
supply of all machinery
and controls related to
Mixing. This includes
machinery like Mixer,
Upstream, Drives & Motor,
Mills and Batch off. This
option relieves the user to a
very large extent and the
responsibility of integration
of all the Automation
systems lies with this
turnkey supplier. Obviously
the cost goes high with such
option but if we talk of the
paybacks, then it's a good
option to choose.
Second option is to choose an
integrator, who also works
like a consultant giving
detailed configuration of the
control systems each
machinery supplier should
consider. The integrator then
supplies the Master Control
System that integrates Mixer
Controls, Upstream Controls,
Mill Controls, Batch off
Controls and Drives. This
integrator should be a
Control System supplier
with a very good knowledge
of Rubber Mixing Process.”
Speaking broadly, second
option is more popular and
a smart option for you to
consider.
Should You buy New,
Pre-Owned Mixing Mill
or Rebuild a Mill?
Mixing Mills are critical
machinery in any rubber
factory.
You can have a variety of
Moulding machines /
Extruders and other
ancillary equipments but
rubber mixing mills are
definitely a prime source
20
or providing semi-finished
rubber in technical rubber
goods industry.
A mixing mill is generally
designed for long life. Thus,
it is normal when you will
choose to upgrade your
existing old mill or you
observe a substantial
demand for Used or
Pre-Owned Mixing Mills.
How do you decide?
Emphasizes Amardeep
Singh Bharaj, “We
encourage our buyers to
invest and buy any capital
safety system equipment
keeping in mind key factors
like Electricity cost, Labour
cost and maintenance cost.
The machines offered today
by Bharaj Machineries are
Uni-drive type and only
with high quality
Anti-Friction roller-bearings
Image: 42" Compact Mixing Mill from Pelmar Engineering

| MIXING MILL |
We often recommend our customers to
get the machines fully reconditioned
with the most up-to-dated controls and
equipped with advance features in order
to enjoy additional lifetime assurance of
reliability and ensuring its long
operational life.
which help one save up to
20% power compared to
old machines. Lubrication
systems are automatic so
you don't need skilled
labour to maintain and
keep an eye on them.
Automated PLC features
helps to analyse mixing
cycles and productions
time and this makes the
machine self sufficient and
not labour intensive.
Having the said features
will help any buyer get the
best ROI in terms of power
saved, practically Zero
Break-down/ Production
losses and Consistent
quality output.”
Eldad Eilam has a
differentiated view and
says, “The answer lies on
the customer preferences
and constraints in terms of
budget and delivery time,
which may vary subject to
scope of the work. We often
recommend our
customers to get the
machines fully
reconditioned with the most
up-to-dated controls and
equipped with advance
features in order to enjoy
additional lifetime assurance
of reliability and ensuring its
long operational life.”
Philip Thomas articulates,
“We usually recommend a
mix of reconditioning and
new components /
upgradation. However, this
depends upon the
customer's budget and
what parts are actually
available along with the
machine to be
reconditioned and what
parts are missing. We are
working on the possibilities
of converting old cored
rolls to peripherally drilled
and bush bearings to
antifriction roller bearings
to improve on cooling,
power consumption and
efficiency of old Mills
currently in operation.”
In reconditioning, it is also
Eldad Eilam
Co-CEO
Pelmar Engineering Limited
21

| MIXING MILL |
22
normal when the rebuilders
strip out the machine and
find it in satisfactory
condition, they will only
recommend a minor
replacement of components
and new painting to provide
the mill with new
appearance.
Future of Mixing Mills:
The changes in rubber
compounding demands and
continuous improvements
in processing chemicals will
direct the usage in future.
While Philip Thomas opines
“From the application point
of view, in certain cases
there is a present trend of
replacing a Mill with for
example a dump extruder.
However, the blending
quality in my opinion is
better in a Mill”.
Mixing mills will continue
to be relevant rubber
machinery in various
product sub-sectors and
there would be demand for
further automation.
Eldad Eilam says, “In the
next decades, we foresee
improvements meant to the
safety and automation
aspects of the mill. The
level of use will probably
be increased and we
anticipate technological
progress in drive solutions
related to the continuous
need for improved
performance and savings
in energy and manpower.”
Amardeep Singh Bharaj
also views it similarly,
“Mixing mills will need to
have Variable Friction
Ratios, so customers can
easily process different
rubbers in one machine
with easy change in Friction
ratios through push of a
button. Peripherally Drilled
rolls will also be in huge
demand as temperatures of
rolls need to be controlled
keeping in mind the nature
of different compounds to
be processed on the
machine. Safety regulations
will be more stringent so
the machines will need
better safety systems as
time demands.”
Concluding, Two-Roll
Rubber Mixing Mills are
available with different
attachments and equipment
as per the kind of raw
material to be blended.
They are no more “simple”
and a proper planning of
the requirements and
drafting of specifications
can help you acquire
optimized technology for
your mixing process –
removing your “woes” to
you exclaiming “wows!”.
RMW
Mixing mills will continue to be relevant
rubber machinery in various product
sub-sectors.
Image: A Rebuilt Mixing Mill

KELACHANDRA MACHINES
(MFRS. OF RUBBER INDUSTRIAL MACHINERY)
Chingavanam - 686 531, Kottayam, Kerala. India.
Phone Off: +91- 481-2430325. Fax: +91- 481-2430596
e-mail: km1912@gmail.com

Two-Roll Mill:
Questionnaire cum Checklist To Select Your Right Machinery
Ever been in a situation, where you
wanted to buy a two-roll rubber mixing
mill but did not know the crucial questions
to ask the supplier? Or terrified with the
different formats of techno-commercial
offer from various suppliers?
Or flummoxed by what basic features
really are required to meet your mixing
operation? Or even more confused to
decide on the different features offered on
the mil?
Yes!!
Well, then you need a ready-reference-
sheet of selection criteria to consult with
the mixing mill supplier and have an
intelligent discussion with your
machinery salesman.
Some criterion on this check list are
optional while most are crucial to aid you
decide well. After the baseline requirem-
ents of your two-roll mixing mill are
frozen, insist your potential suppliers to
give you a quote focused on these needs.
Of course, there are developments in two-
roll mill. If your supplier offers additional
features, treat them as options or extras to
your core requirement. Subsequently, you
can compare on various brand factors –
including workmanship quality, supplier
| SELECTION CRITERION FOR TWO-ROLL MILL |
Buying lowest priced mill without
focussing on the features you need
for your rubber mixing operation
will lead you to post-purchase
discontent.
reliability, product aesthetics & durability,
after-sales service and spares support to
your market, price and discounts, etc to
decide the most suitable supplier.
Buying a lowest priced mill without
focussing on the features you need for your
rubber mixing operation will lead you to
post-purchase discontent.
Adopt this Two-Roll Mill Selection
Questionnaire and avoid buyer's remorse.
Image of a Mixing Mill With Stock Blender
24

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Criterion Please Answer Descriptively if needed
Production Requirement: ___________________ Tons/Hour;
___________________ of 8 hour Shifts/Day
What is your expectation
from this Mill?
(Please tick appropriate
boxes)
 Warming/Pre-heating (before feeding into next stage)
 Mixing (for thorough blending of compound)
 Dump Mill (below mixer/kneader)
 Sheeting out
 Refiner Mill
 Cracker Mill (with corrugated rolls for breaking cold
rubber sheet)
 Others
If Others, please specify:
Mill Size
(Roll Diameter x Length)
___________________ MM x ___________________ MM
Type of Mill:
(Please tick)
 Both Rolls Plain
 One Roll Corrugated
 Both Rolls Corrugated
Roll Type:
(Please tick)
 Both Rolls Centrally Cored/Bored
 Only one Roll Peripherally Drilled
 Both Rolls Peripherally Drilled
Friction Ratio Required
(Optional)
Nip Gap Adjustment  Manual
 Motorized
 Hydraulic
26

27
Mill Speed: (RPM/MPM)
(Please fill and tick)
___________________ RPM; or
Roll Surface Speed of ______________ MPM
 Variable Speed (VFD) Motor required for different
speed
Mill Stock Guides
(Please tick appropriate
boxes)
 Fixed
 Pneumatic Movement
 Motorized Movement
 Hydraulic Movement
Mill Gearbox / Reducer
(Please tick)
 Unidrive (Gearbox to have single input shaft/double
output shaft)
 Semi Unidrive (Connecting Gear on Mill Rolls)
 Independently Driven Rolls with Variable Friction
Ratio
If you have any Service Factor (SF) specifications, note
here or discuss with the manufacturer without fail.
Accessories/Features
Required :
(Please tick)
 Temperature Control Unit
 Stock Blender
 LVDT for nip gap measurement
 Emergency Stop features
 Others
If Others, please specify:
Details on any major
components that are of
abrasive or heat sensitive
nature in your recipe
(Optional)

Any other inputs you wish
to share on your need.
(For example, brands of
electrical, hydraulic
components, or lubrication
requirements, etc -
Optional)
This article was first published on Rubber Machinery World Information Portal. You can
access the link to original on:
http://rubbermachineryworld.com/2015/02/20/two-roll-mixing-mill-criterion-check-list-for-
buyers/
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