Knoll Maschinenbau GmbG

Archiv for: MX Product Features

The MX sweetens baked goods in the machines of Bakon Food

L1169819In the enrobing machine of Bakon Food Equipment, the MX-20-R progressing cavity pump of KNOLL Maschinenbau ensures reliable pumping of sensitive media such as chocolate and fondant. Worldwide many customers in the baked goods industry use machines from Bakon Food Equipment (headquartered in Goes, Holland) to spray or coat cakes, pralines and sweets, to glaze, plate, and cut them. Bakon’s product offerings also include complete systems, such as the “cake line”, which can plate, glaze, and cut both round and square cakes at one go.
Bakon uses the progressing cavity pump MX of KNOLL Maschinenbau to pump fondant and chocolate in a liquid state for many years. To hold the product at a constant temperature, KNOLL applies a MX 20-R-40/10 with double jacket for heating the pump unit. The main advantages of the MX are its gentle pumping characteristics of abrasive media. The feeding screw in the hopper housing supports a continuously pumping of chocolate and fondant with low pulsation.L1160100
The many advantages of the EvenWall®-technology of the stator offer the customer e.g. a high pressure stability, long lifetime and a production by low consumption. Similarly, the compact assembly length makes concessions to the small space in the enrobing machine of Bakon and enables an easy integration of the pump into the system of the machine. Get more information about the use of the MX in the baked goods industry and visit us at the IBA in Munich, from 12. – 17. September 2015 in hall A5, booth 311 – we look forward to your visit!

The countdown for ProSweets in Cologne has started

Logo_ProSweetsJust a few more days and the ProSweets opens its doors. The international supplier fair for the confectionary industry takes place from 01st – 04th February 2015 in Cologne. The fair offers a lot of innovations and technologies for the production and packaging process of confectionary products.

The progressing cavity pump MX from KNOLL Maschinenbau satisfies the requirements and needs of this industry. Due to the compact design and the execution in EvenWall® technology, the MX offers gentle product transfer, outstanding pressure stability and exact dosing properties as well as a number of other advantages for applications in the confectionary industry.

Visit the ProSweets Cologne and convince yourself of the advantages of our progressing cavity pump MX. We look forward to your visit and welcome you on our booth C071 in hall 10.1.

If you would like to visit the ProSweets, but you don’t have tickets yet, please give us a call at +49 7581 2008-353 or send an e-mail to – we’ll provide you with free entry vouchers.



The brandnew animation of the KNOLL progressing cavity pump MX

The progressing cavity pump MX form KNOLL Maschinenbau characterized by it’s modular design and it’s serviceability is the perfect solution for your application.


Why does KNOLL use a bearing block for the MX?

The MX progressing cavity pump by KNOLL offers product-conserving delivery, ease of servicing and virtually pocket-free design, as well as a string of other advantages.

KNOLL uses a bearing block in each of its progressing cavity pumps from the compact MX10 version to the XXL-sized MX100 version. This unique feature clearly sets KNOLL apart from its competitors.
By using a bearing block, we can supply the pump without a drive unit. The advantage here is that the customer receives a ready-to-use standby pump with no need for laborious shaft sealing unit assembly.

Bearing Chair MX20Another advantage is that the axial forces are absorbed by the bearing block and do not have to be factored into the design of the geared motor. This allows the use of smaller and more cost-efficient drive units.
A stainless steel-bearing block is standard on the MX10 and MX20 models, which means that KNOLL is able to supply these pumps entirely made from stainless steel. Used in combination with a stainless steel geared motor, the MX is the perfect solution for hygiene environments and similar applications because it can be cleaned easily and quickly.

Discover for yourself the advantages and performance of our progressing cavity pump MX and contact our sales representative. We will be happy to sit down with you and design a custom solution tailored to your application needs.

KNOLL’s MX does not heat up even at 140 °C

The MX progressing cavity pump from KNOLL is used in many different areas, from the food and beverage industry to pharmaceuticals to the chemical industry. This pump also stands the test in extreme cases. This has been proven at Europe’s leading manufacturer of building shells, interior fittings, and insulation technology. Here, the MX is incorporated into the process of reclaiming fibrous plasterboard. It withstands temperatures of 140 ° C and an extremely abrasive fluid.

Progressing cavity pump MXWaste and remains of the plasterboard panels are relegated to a viscous suspension of approx. 500 mPas. Using the MX, this fluid is pumped back into a reactor before it is processed into new fibrous plasterboard. A challenge of this use is the high temperature of the fluid, 140 °C. Thanks to its special design, the MX performs well: the EvenWall® technology of the KNOLL stator guarantees even pressing even at high temperatures. This improves the durability of the stator considerably. Another challenge of the fluid is its abrasive character. The plaster suspension contains 10 – 15 µm particles with a concentration of 32 – 50 %. The MX also has the solution for this: a stator of wear-proof special elastomer for high temperatures as well as a specially-coated rotor, which also demonstrates wear-proof qualities despite the extremely abrasive fluid.

An additional benefit of the KNOLL MX progressing cavity pump is the even flow speed in the suction housing, which prevents sedimentation and thus the settling of the fluid. This is the result of the even diameter of the cardan joint and the pump’s design, which keeps the clearance volume low. Therefore, no fluid accumulations form on the joint or on the housing wall.

Rotary piston pumps were used for this process in the past, however without any success. After just a few weeks, the pumps had to be replaced due to wear. The MX progressing cavity pump from KNOLL has been used for six months already and shows no traces of wear.

Application of the KNOLL progressing cavity pump in the wastewater industry

A new application for the MX is the loading of chamber filter presses in the wastewater treatment sector.

A so-called feed pump feeds the sludge or suspensions into the cavities of the filter chamber, initially at zero pressure and at a high delivery rate. The pressure inside the filter chambers begins to rise when the solids form a layer upstream of the filter cloth. The speed of the feed pump, i.e. the delivery rate, decreases with rising pressure. The process medium is fed into the chambers at pressures of up to the set maximum of approx. 16 to 20 bar. The adjustment range of the feed pump should, because of the time factor, be as large as possible, i.e. the initially pressureless filling process requires a very high delivery rate compared to the low delivery rate during the pressure holding cycle at maximum pressure.

This is why two pumps are normally used for the filtration process. A larger single-stage pump fills the filter press until a medium pressure of 4 – 6 bar is achieved. A small 4-stage pump is used for the high-pressure process until dewatering has been completed and a sufficiently dry filter cake has formed. A further reason for using two pumps is the poor efficiency of conventional progressing cavity pumps at very low speeds. A strong backflow, which also decreases the lifetime of the equipment, occurs in conventional stators at low speeds and high pressures.   

KNOLL Maschinenbau requires only one progressing cavity pump for the entire filtration process. This pump operates both as a filling pump and as a high-pressure pump. The MX handles the process in a two-stage configuration and can cover the full control range with a high level of efficiency. Thanks to the stator with EvenWall® geometry, the MX pump has a very linear characteristic and reliably provides the required pressure at a very low frequency. The KNOLL technology saves the investment in a second pump and minimises the cost of process control. It also cuts energy costs by approx. 50 %.

The two-stage MX pump can deliver pressures of up to 24 bar and is ideally suited to this application as a filling and high-pressure pump.

Efficient antipasti production using KNOLL progressing cavity pumps

Progressing cavity pumps from KNOLL Maschinenbauare used world-wide in various sectors. In addition to being used for processing paints and lacquers, chemical or pharmaceutical products, they are the pumps of choice in the foodstuffs industry in particular. The versatile MX can be used in many processes, for example as a dosing pump or transfer pump or for the plastification of media. KNOLL has developed the MX plastifier version specially for plastifying highly viscous to compacted media – an application in which it offers a number of advantages.

A german manufacturer of antipasti products has greatly simplified its production process by using the MX P version. The filling of olives, peppers and chilies with fresh cheese was a very complex and time-consuming process before the introduction of the MX. Each individual husk had to be filled manually using a pressure system.
Used in combination with the dosing system from a south German plant manufacturer, the MX50P-80/10 allows olives, peppers and chilies to be filled fully automatically – all in a single operation. 100 fillings are possible per dosing cycle.

The hard fresh cheese, which is stored in 10 kg buckets and cooled to 6°C, is collected by the pump from the large top-mounted hopper and plasticized to a viscid product with the aid of the feed screw and a special hopper geometry. Stuffing of the fresh cheese products is achieved by co-ordinated operation of the feed screw and pump assembly. This allows air to escape upstream of the pump assembly, preventing air from being trapped in the fresh cheese.

This efficient system has been in operation for several years now and has simplified and improved the working process for the producer.

Pumping pumpkin mix with the MX

A US company in existence since the 1950’s has specialised in processing fruit and vegetables.
In addition to a wide variety of tinned fruits, they also make the cake filling for pumpkin pie, a favourite dessert among Americans.
“Pumpkin Pie” is a traditional US dessert, traditionally served from late autumn to early winter, and especially on public holidays such as on Halloween and Thanksgiving.

The pumpkin harvest takes place in the autumn.Processing of the pumpkin harvest takes from October until December, a phase described by the producers as the “pumpkin drive”. 
The customer previously used a rotary piston pump manufactured by a well-known US manufacturer for the further processing of pumpkins.
Even though the pumpkins were shredded, boiled and thoroughly cleaned prior to processing, tiny particles of sand still cling to their skins. The abrasive properties of the sand grains make pumping very difficult for the radial piston pump.
Since both the housing and the piston in these pumps are metallic, the sand particles act like sandpaper on the metallic components of the pump and wear out the inner workings of the radial piston pump within just 72 hours.
During the so-called drive, manufacturers of pumpkin cream incur enormous costs due to the high rate of wear and tear on the radial piston pumps. To reduce these costs, a KNOLL progressing cavity pump is now being used in place of the radial piston pump.

KNOLL uses a standard type MX30S-60/10 pump for this application.
Thanks to MX EvenWall® Technology, which provides exact and even pressure between the ductile coated stainless steel rotor and the soft elastomer of the stator, the MX offers many advantages in this field of application.
The closed pressure chambers of the KNOLL pump prevent medium from flowing back into the lower-pressure chamber (eliminating jet abrasion). This has two advantages: firstly, it allows very high operating pressures to be used and, secondly, the abrasive particles effectively have no chance of damaging the pump surfaces. It also allows the pump to be better primed with up to 100 mbar of absolute vacuum.
A further advantage of a KNOLL progressing cavity pump is that it is easy to clean.
A MX can also be operated filled with water, thus enabling the pump to clean itself. This also allows the remaining pumpkin mix to be pushed out of the pipes in order to clean the pump system and piping. This means that the MX is capable of achieving the same high pressures with water as with high-viscosity media. During cleaning, it is important that RPM can be regulated. Using the MX, pump speed can be regulated in stages from 1 to 20 as standard.

A radial piston pump, on the other hand, can only build up a low pressure when running at low RPM and using low-viscosity media. Backflow into the preceding pressure chamber cannot be prevented because the pressure chambers are not closed. A “buster pump” is needed for cleaning because a radial piston pump cannot clean itself or the piping.

The KNOLL progressing cavity pump was used for the first time midway through a pumpkin drive. At the close of the pumpkin season, the pump was examined at our factory. It had been in use for approx. 1-2 months and exhibited minimal sign of wear and tear.
The KNOLL pump has now been in use for 2.5 pumpkin drives. For the producers of the pumpkin cream, the extended life of the pump is a major boon as it cuts costs significantly and allows many processes to be simplified.

Preventing bridging with the MX50 feed hopper version

KNOLL develops, designs and produces solutions customised to the specifications of its customers. These include one of the world’s leading oil companies, which has successfully been using KNOLL progressing cavity pumps for several years now.

An existing progressing cavity pump was replaced with an MX pump by KNOLL by optimising a production process. With this application, grease is pumped at temperatures in the 100 – 200 °C range and at a viscosity of approx. 10,000 mPas. The process is such that it is possible for clumps of grease to arrive at the pump despite the high temperature and the liquid properties of the medium.

In this case, an MX50R-60/10 with bridge breaker and separate drive was used in order to prevent bridging. Taking account of the medium’s complex properties, the bridge breaker ensures controlled and troublefree delivery of the low-viscosity grease.

The universal joint runs in needle bearings lubricated with heat-resistant lubricants and, thus, is suitable for applications involving temperatures up to 250 °C.

Given the customer’s pre-existing machine set-up, the current pump’s connecting dimensions were adapted to match those of the MX pump, both at the feed hopper flange and at the pressure connection. This enabled Knoll to provide the customer with a more simple and, above all, more efficient refit.

Pumping frozen fruits with the feed hopper version of the MX30

Austrian foodstuffs manufacturer Agrana is the European market leader in the field of biological fruit preparations. Here, research and development play a key role, both at product level and in the production processes themselves.

The MX by KNOLL Maschinenbau was used on a trial basis as part of a new fruit processing concept and produced an impressive all-round performance. The task was to collect and convey various fruit varieties in a still frozen state.

A heated MX30R-60/10  was used for the test setup. Its trough-like shape prevents build-up from occurring on the hopper walls while the tapered worm conveyor ensures optimal product removal from the hopper floor. The CIP-compatible axial face seal with torque transfer element facing away from the product allows easy cleaning while intelligent joints make for fast dismantling. By way of an option, an additional extension hopper can be adapted.

The tests at Agrana showed that the MX provides reliable transportation of various fruit media from starting temperatures as low as – 18 degrees (Celsius). It was able to feed the partially still deep frozen fruits directly into the pump. The media were, as planned, reduced by the MX in a controlled way while being conveyed.

The case study shows that the feed hopper pump version of the MX eccentric screw pump is able to effectively support innovative production processes in the foodstuffs industry. The MX is a good choice when it comes to implementing new formulations or new production methods in a way that maximises sustainability and efficiency while ensuring the gentle processing of natural base products.