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Original:Clay Brick and Tile Moulding Equipment 14

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Clay Brick and Tile Moulding Equipment (GTZ, 1991, 18 p.)[edit]

Heuser Pug Mill/Extruder LSP 250 and STP 300[edit]

Heuser Maschinenbau GmbH
Katharinenstrasse 4
D-5410 Hohr-Grenzhausen
Federal Republic of Germany
Tel. [..49] 2624 - 7132
Fax. [..49] 2624 - 6923


For the proper mixing and kneading of clay, pug mills are widely used in the ceramic industry and brickworks. Pug mills mainly consist of two counter-rotating augers, which pull the clay downwards, where it is thoroughly kneaded by means of a helical screw, before it is extruded through an opening (mouth piece) which gives the emerging 'sausage' a uniform cross-section. This cross-section, which can be solid or hollow, is determined by the interchangeable die fixed to the mouth piece. Any suitable type of die can be made according to the customers' specifications.

The Heuser LSP 250 pug mill / extruder was specially designed to process clay for building construction. In order to achieve a better clay mix, the helical screw has been substituted by a set of blades, fixed at intervals in a spiral arrangement around a horizontal shaft.

Both the LSP 250 and STP 300 are driven by an electric motor and gearbox at the rear end of the machine. Diesel or petrol engine driven machines can be supplied on request. While the STP300 is principally a stationary machine, the LSP 250 is equipped with castors for transportation. Optional extras are cloth lined roller conveyor tables to receive the the extruded clay, and wire cutters for easier and more accurate cutting of components.

Operating the Heuser LSP 250 and STP 300

The well-tempered clay, or clay with additives, is shovelled continuously into the opening above the counter-rotating augers. Alternatively, the machine can be fed by means of a conveyor belt. In order to ensure continuous production with uniform compression of the clay, it is important that manual feeding of the LSP 250 and STP 300 is done by 2 persons and 3 to 4 persons respectively.

The clay can be received and cut to suitable sizes on a roller conveyor table with a wire cutter, or extruded onto a board or metal sheet, on which it is cut and carried away for drying.

LSP 250

STP 300

Size of machine (length x width x height)

220 x 70 x 90 cm [87 x 28 x 35 in]

330 x 90 x 90 cm [130 x 35 x 35 in]

Weight of machine

500 kg

1800 kg

Size of crate for shipment (I x w x h)

260 x 110 x 150 cm [102 x 43 x 59 in]

370 x 130 x 150 cm [146 x 51 x 59 in]

Weight of packed machine

580 kg

2000 kg

Diameter of cylinder

25 cm

30 cm

Max. section of extruded clay

�16, or 16 x 16, or 18 x 10 cm

�20, or 18 x 18, 24 x 12 cm

Electric motor

5.5 kW, 220/380 V

15 kW, 380/660 V


2 - 3 tonnes/hour

3 - 5 tonnes/hour

Labour force required

2 - 3 persons

3 - 4 persons

Price (ex works) valid June 1991

LSP250 17900 DM (» 10500 US0

STP300 3 1700 DM (» 18600 US0

DM = Deutsche Mark