TPT November 2008

T ube E xtrusion & D rawing T echnology

Advanced extrusion line for multilayer PVC pipes

The line is fitted with a dosing system for the extrusion of the middle layer (foam PVC) with dedicated design to satisfy the need of this application. The line includes extrusion units including a counter-rotating twin-screw extruder 2B 125 28 L/D (middle layer B with foam PVC), and Nr 2 counter-rotating twin screw extruder 2B 65 28 L/D (layers A e C Rigid PVC). For efficient operation, the line features a calibration tank with automatic control of vacuum level, and spray cooling tank. In addition, the line incorporates a haul-off unit (with 6 caterpillar) for synchronization of the speed from the main operator control unit. The line is rounded off with a planetary cutting unit with cutting disc, automatic belling machine, and a line supervisor with industrial PC and colour graphic display. Established in 1947, the company has built a large knowledge base in different plastic material, with particular attention to plastic pipe application. The company supplies over 200 extruders each year, supported by a technical team of highly experienced engineers. Costruzioni Meccaniche Luigi Bandera SpA – Italy Fax : +39 0331 680 206 Email : lbandera@lbandera.com Website : www.luigibandera.com

Costruzioni Meccaniche Luigi Bandera, Italy, has recently supplied the latest extrusion line for multilayer PVC pipes to a leading European manufacturer of plastic pipes. The state-of-the-art line is characterized by the new counter-rotating twin-screw extruders and a specifically designed extrusion head.

This unit is just one part of a larger supply which includes other lines for the production of PVC and HDPE pipes with different range diameters and production capacity to satisfy the building industry. The line is designed for rigid PVC (layers A and C) and foam PVC (layer B), with an output of 1,000kg/h and diameter range of 250-500mm.

 An extrusion head for pipe with a maximum diameter of 500mm

Extra heavy-duty caterpillar haul-offs for effective extrusion

Gillard, UK, has extended its range of precision caterpillar haul- off and take-off machines. The new machines are extra-long belt versions of the Gillard ‘work-horse’ range. The extended belts are now available in lengths of either 1,500mm or 1,800mm. Belt widths are either 225mm or 300mm.

The company claims that the longer belts enable higher tractive efforts to be achieved with considerably less clamping pressure on the extruded products. This avoids distortion and damage, particularly to thin-wall products. The new caterpillars also feature an updated drive package with direct drive AC servo motors powering the belts. Two digital servo drives are used in master/slave configuration for optimum speed control. The top belt is designed to ‘float’ over any lumps or bumps created during the start-up of the extrusion line. The entire top boom is suspended on two air cylinders at either end. This allows the belt to automatically raise and lower itself over the lumps while maintaining an adequate grip on the extrusion. The machines are fully guarded to the latest CE standards. Gillard offers a wide range of options to enable users to customise the machine to their needs. Peter Gillard & Co Limited – UK Fax : +44 1684 290330

 Gillard’s new machine has longer belts for less pressure on extrusions

Email : cgillard@gillard.co.uk Website : www.gillard.co.uk

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N ovember 2008

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