The ECT-KEMA team would be glad to advise and assist you in developing an optimum solution for your company – please contact us!

ECT-KEMA GmbH • Demianiplatz 21/22 • D-02826 Görlitz Phone:+49 (0)3581-878 777-0 • Fax: +49 (0)3581-878 777-77E-Mail: info@ect-kema.de • Web: www.ect-kema.de

This Newsletter provides you with information on:

• The product range with specifications of our high-tech piston extruders >> read more

• The pros and cons of the piston extruder compared with the screw extruder >> read more

• Certification of ECT-KEMA GmbH in accordance with the Quality Management System ISO 9000 >> read more

Newsletter of ECT-KEMA GmbH • Edition 2/2016:

As ECT-KEMA produces both piston extruders and screw extruders, we are in a position to objectively assess the pros and cons of these machines in practical operation.In the ceramics industry both systems are employed for the extrusion of plastic bodies. The following table compares the continuous, the intermittent and the indexed extrusion methods:

Piston Extruder Screw Extruder

Continuous extrusion X

Intermittent extrusion X

Indexed extrusion X X

Simply the Best

• High speed control range• Direction of extrusion with angle of inclination from 0 – 90 degrees• For automatic or manual operation• Exact and pressure-independent control of the piston speed • All operating data can be read and recorded at the display• Use of state-of-the art sensor technology• Robust design • Microprocessor control to guarantee maximum consistency in forward feed of the press cylinder and for accurate control of the proportioning valves

Receiver

Our Scope of Delivery

High-tech piston extruder with diameter of 300 mm – designed by ECT-KEMA GmbHfor a Chinese customer for the production of special honeycomb profiles

Diameter of Receiver (mm)

max. Pressing Force (kN)

KPH 50 50 75

KPH 80 80 200

KPH 120 120 450

KPH 140 140 600

KPH 200 200 1250

KPH 300 300 2500

KPH 400 400 5000

KPH 500 500 7500

Our modular design system enables us to accommodate special requests from clients in res-pect of diameter, pressing force, wear protection, etc.

Quality Management System

Since 18th August2016 we have it in writing: the company structures, the internal workflows and processes at ECT-KEMA comply with norms and standards in accordance with DIN EN ISO 9001:2015. These standardized processes will ensure a high degree of delivery reliability, the quality of our products and strengthen the trust of our customers in our performance and effi-ciency. As a result of this certification, our internal processes can be quantified and hence be systematically optimized. This demonstrates that customer satisfaction is our ultimate goal.

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Pros and Cons

It has to be assessed in each individual case whether a screw extruder or a piston extruder is the better solution, taking into account the body and product to be extruded, throughput rate and other boundary conditions.If the machine is to be charged with billets which are de-aired at a high degree, a screw extru-der would be the preferred machine for the billet extrusion.

Pros of the Piston Extruder: • Generation of extremely high pressing forces• Easy cleaning with minimum loss of material• Minimization of the laminations which are typical for screw extrusion• Low wear and tear when processing abrasive materials• Extrusion of small material batches

Cons of the Piston Extruder:• Intermittent extrusion • Small throughput rate due to higher setting-up times• Textures caused by intermittent extrusion (at the joints)• uboptimal de-airing in the receiver

Piston with de-airing bell

Our Plant Design

Three major problems must be solved in designing extrusion plants involving piston extruders:

• Adequate de-airing• Charging of receiver• Reduction of setting-up times

Whilst optimum de-airing can be achieved in feeding a finely shredded ceramic material into the vacuum chamber of a screw extruder, the so-called “inner de-airing” within the receiver of the piston extruder will always be suboptimal, in spite of sophisticated solutions for instance in the form of the de-airing bell with its perfect seal as designed by ECT-KEMA (see illustration above). This applies in particular for the charging of bulk material. We therefore recommend, as a matter of principle, to feed de-aired billets into the piston extruder. As well as shortening setting-up times, this also allows an automatic charging and ensures an adequate evacuation of the air between the billet and inside wall of the receiver. Producing billets by multiple ext-rusion on piston extruders is in our view only a makeshift solution – physics simply cannot be outsmarted – especially not for ceramic materials which are sensitive to de-airing.

Layout Abb. 6

Mischer oder Knetermixer or kneader

Vakuumaggregatvacuum unit

Beladungcharging

Kolbenpressepiston extruder

Plant layout consisting of piston extruder and specially-designed screw extruder for the production of billets, including automatic charging of the piston extruder for vertical operation.

mixer or kneader vcuum unit charging piston extruder

High Performance by PerfectionFaster, more accurate and with improved reliability – ECT-KEMA universal Piston Extruders

Everything is possible