Product Category: Single Screw Extruders

New amazing conical 12.5 mm single screw extruder that can be fed with regular pellets

This unique extruder was designed in house by our engineers and the actual screw design was made for us by Dr. Chris Rauwendaal, a world renowned expert on extrusion technologies. The purpose of the extruder is to be able to extrude minute amounts of resins and still be able to use regular resin pellet sizes. A straight 12.5 mm single screw extruder would have a much too small screw depth at the in feed section and then could only be fed with resins in powder forms.

This 12.5 mm conical single screw extruder can be used for compounding together with our small water bath type LWB40 and pelletizer LZ 80. But we think its main applications is with downstream single layers as well as co-extrusion multi layer film and sheet productions, where the very small output offers a very economic alternative against larger lines for research and educational purposes. Actually the first production of these small extruders was used for two sets of a 3-layers co-ex Chill Roll and Film Blowing lines. Here the conical design of the extruder screws proved to give an excellent plasticization and dispersion of the resin, equal to what is obtained with larger single screw extruders, even those equipped with mixing screws.

For general compounding of PE, PP, PS, ABS etc, non-vented type equipped as following:

Screw and barrel in high-grade nitride steel, screw diameter 25 mm and L/D ratio of 30. Optionally available with bimetallic barrel giving optimum ware and chemical resistance. Screw with Maddock mixing section at 22 D and with pineapple mixing at screw tip. Compression ratio 1 to 3. Other screw types including our modular screw elements where you can build your own screw configuration available. Screw speed infinitely variable from 0 to 300 RPM. 4 kW AC motor drive, coupled directly to an in line heavy-duty helical gear box, which in turn is connected to an individual housing containing the oversized thrust and position bearings for the screw drive. Optional 5.5 kW drive with high torque gear box, recommended for processing of rigid PVC as well as difficult to extrude polymers. The screw speed is here infinitely variable from 0 to 200 RPM.

The vented version of our 25 mm extruder has been developed with a special screw design, which ensures very good feeding properties without material bleeding out of the vent. The screw designs has been tested and proven with many different polymers such as LD & HD-PE, PP, PS, ABS, Nylon, PC and PET. The features are the same as our non-vented version with the following additions: Vented screw design with Maddock mixing section at 15 D followed by the decompression and venting zone. The screw at the vent and to the end has double flights for optimum feeding property. The tip of the screw is equipped with split open flanges for additional mixing. Large vent opening with housing made of Stainless Steel. It is also equipped with stainless steel swing open lid with large Polycarbonate window and with pipe connection for the vacuum pump. The swing open lid is equipped with rubber seal to give a tight vacuum fit to vent. Built in vane type vacuum pump driven by a 0.3 kW motor and with an air capacity of 6,000 litre per hour. A large stainless steel mesh filter protects the vacuum pump and the mesh is housed in a see through Polycarbonate container which can be easily unscrewed to clean the filter. The pump inlet is further protected with a small paper filter. Including a vacuum dial gauge and release valve mounted on the top of the extruder barrel behind the vent opening. The ON/OFF selector switch for the vacuum pump is located just below the vent opening and is lighted red when the pump is on.

For general compounding of PE, PP, PS, ABS etc, non-vented type equipped as following

Screw and barrel in high-grade nitride steel, screw diameter 30 mm and L/D ratio of 30.  Screw with Maddock mixing section at 22 D and with pineapple mixing at screw tip. Compression ratio 1 to 3.  Screw speed infinitely variable from 0 to 200 RPM.  Large oversized drive with 7.5 kW AC motor, coupled directly to an in line heavy-duty helical gear box, which in turn is connected to an individual housing containing the oversized thrust and position bearings for the screw drive.

The vented version of our 30 mm extruder has been developed with optimum performance and still no resin bleeding at the vent. The screw is designed for processing of most polymers and has the same features as described for the non-vented version as well as:

Vented screw design with Maddock mixing section at 15 D followed by the decompression and venting zone. The screw at the vent and to the end has double flights for optimum feeding property. The tip of the screw is equipped with split open flanges for additional mixing.  Large vent opening made of Stainless Steel. Equipped with stainless steel swing open lid with large Polycarbonate window and with pipe connection for eventual vacuum pump. The swing open lid is equipped with rubber seal to give a tight vacuum fit to vent.

For extrusion of most thermoplastic resins, non-vented version equipped as following:

Screw and barrel in high-grade nitride steel, screw diameter 40 mm and L/D ratio of 30.  Screw plain version with compression ratio 1:3 (others on request) Screw speed infinite variable from 0 to 250 RPM.  Large oversized drive with 11 kW AC motor, coupled directly to an in line heavy-duty helical gear box with internal thrust bearings.  Programmable frequency inverter for infinite variable screw speed and high torque even at low screw speeds. Digital readout of the screw RPM and motor power in percent of full load from instruments mounted on the control panel.  4 heating zones on barrel, all with air-cooling.

The vented version of our 40 mm extruder has been developed with optimum performance and still no resin bleeding at the vent. The screw is designed for processing of most polymers and has the same features as described for the non vented version as well as:

Vented screw design with Maddock mixing section at 15 D followed by the decompression and venting zone. The screw at the vent and to the end has double flights for optimum feeding property. The tip of the screw is equipped with split open flanges for additional mixing.  Large vent opening made of Stainless Steel. Equipped with stainless steel swing open lid with large shock resistant window and with pipe connection for eventual vacuum pump. The swing open lid is equipped with rubber seal to give a tight vacuum fit to vent.

For extrusion of most thermoplastic resins, non-vented version equipped as following: Screw and barrel in high-grade nitride steel, screw diameter 45 mm and L/D ratio of 30. Screw with Maddock mixing section at 22 D and with pineapple mixing at screw tip. Compression ratio 1 to 3. Screw speed infinite variable from 0 to 250 RPM. Large oversized drive with 22 kW AC Vector motor, coupled directly to an in line heavy-duty helical gear box with internal thrust bearings. Programmable frequency inverter for infinite variable screw speed and high torque even at low screw speeds. Digital readout of the screw RPM and motor power in percent of full load from instruments mounted on the control panel.

The vented version of our 45 mm extruder has been developed with optimum performance and still no resin bleeding at the vent. The screw is designed for processing of most polymers and has the same features as described for the non vented version as well as:

Vented screw design with Maddock mixing section at 15 D followed by the decompression and venting zone. The screw at the vent and to the end has double flights for optimum feeding property. The tip of the screw is equipped with split open flanges for additional mixing.  Large vent opening made of Stainless Steel. Equipped with stainless steel swing open lid with large shock resistant window and with pipe connection for eventual vacuum pump. The swing open lid is equipped with rubber seal to give a tight vacuum fit to vent.