Laboratory roll mill Polymix 200L

The laboratory roll mill Polymix 200L with a roll diameter of 200 mm is the best solution for mixing all kinds of rubber materials:



Latest technical concepts for drives, gap adjustment and heating as well as an innovative safety system are combined with dimensions and elements proven for many years.



Laboratory roll mill Polymix 200L


Basic layout

Drives, gap adjustment, lubrication system and the electrical enclosure are mounted in a frame and allows easy access for maintenance. Operating elements and controllers are located in a central panel besides the roll unit. Operation from both front and rear side is possible by turning the panel.



The rolls are made of chrome alloy steel in tooling quality with a high hardness of 60-62 HRC. A precise grinding allows best surface for rubber processing. Rolls are running in heavy duty roller bearings. Grease lubrication for long maintenance periods.The working area is determined on the front roll by polished material guides made of cast iron.



The machine is equipped with two high-power drives and increased torque for high mixing forces. Power transmission is done by roller chains. The basic machine comes with two fixed speeds and a constant friction. As an option the speed can be made adjustable. This allows adjustable speed between 5-25 rpm and setting of different friction values.


Gap adjustment

Gap adjustment is motor driven. A toggle-lever system leads to high forces within the working range (0,3 – 8,0 mm) as well as to a quick E-Stop opening. Gap width is shown on gauges.



The safety layout has been developed together with German safety associations and meets the latest European safety norms. The safety concept includes mechanical brakes, a quick opening system, knee switches and a safety cage with two levers along the roll gap. The safety cage is laid out as a tube to feed material from the overhead.

In case of danger the quick opening realize a fast opening to 50mm in less then 3 secs.



The rolls are laid out for water circulation to allow heating or cooling. Peripherical bores in the rolls ensure an excellent temperature transfer. An external heating unit for temperatures up to 90°C or 140°C with an integrated closed-loop control provides automatic heating or cooling.



Combination of touch screen and PLC-control allows comfortable operation of the machine. The functions can be operated from different screens. An intensive use of graphic elements provides easy operation.

Polycontrol includes set point management, automatic gap width control, program management with time sequences in four steps and several helpful functions for the daily use in a laboratory. On request an interface to Microsoft Excel is available.


The basic machine can be modified with a number of options to meet customer requirements.

Chrome plated rolls, hinged material guides, various drives, water heating units for different temperatures, an extended touch screen control Polycontrol, as well as other options.


Machines are delivered complete with all integrated controls.


Detailed views Polymix 200L


Electrical parts are clearly installed. All components are produced by renound international manufacturers.   Polycontrol touch screen and PLC for comfortable operation of the machine.   Motorized gap adjustment with a quick opening system in emergency
Two geared AC-motor drives with mounted below the rolls. Power transmission by roller chains.   Optionally installed inverters allow adjustable speed and friction.   Safety levers along the roll gap with improved and optimized position allow safe working with all kinds of plastic material.
Optimized protection device with a slot for all kinds of rubber material.   Optimized protection device with a slot for all kinds of rubber material.   Electrial heating is separeted from the optional water cooling unit.
Optional water cooling is located on the drive side of the rolls. Controlled by two solenoid valves.   Polished material guides on the front roll determine the working area.   Hinged material guides are available for front and rear roll.
Oil lubrication system is clearly installed in the frame and allows easy access for maintenance.        

Technical Data Polymix 200 L

Polymix 200 L unit value
Roll diameter
mm 200
Roll width
mm 550
Working width
mm 480
Roll speed constant min-1 17 / 21
Roll speed adjustable
min-1 5 - 30
Drive power
kW 2 x 5,5
Drive torque
Nm 2000
Roll temperature
up to °C 220
Heating power per roll
kW 9,0
Machine length
mm 1600
Machine depth mm 900
Machine height mm 1450
Machine weight kg 1600

Servitec Maschinenservice GmbH
Bremer Ring 7
D-14641 Wustermark

Phone: +49 33 234 - 86 010
FAX:      +49 33 234 - 86 011

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Hochpräzise Laborwalzwerke und Laborpressen – für Kunststoffe und Gummi

High-precision laboratory mills and laboratory presses - for plastic and rubber