MACHINERY | DIE DEVELOPMENTS
Right: Conextru has developed a new type of coating crosshead for an automotive customer
profile; and, a company’s material database can be moved to a shared network drive – allowing every user in a company to access all material files.
Automotive crosshead Conextru of Austria has developed a new type of crosshead for an automotive customer. The crosshead allows a special coating process
for a textile-reinforced tube, which is used to transport hot and cold water inside the car. The cross head makes the final outer surface for this new kind of hose, which is designed to replace rubber hoses. The crosshead, called PO 2 63 CR IL HV, is suitable for polyolefins, creating a two-layer structure for a working range of 5-40mm pipes – with a thin inner layer for adhesive and a larger layer of a special thermoplastic elastomer (TPE). The crosshead is based on Conextru’s standard
spiral distributors and deigned for a throughput up to 120 kg/h and maximum back pressure of 300 bar. The head can also be used for other coating
application with materials including PE 80, PE 100, PE-RT, PA, EPDM, TPU and TPV. Depending on the application, and what is being coated, there are two different coating processes possible: • Pressure pipe coating for pipe with very close tolerances in roundness and dimension; and,
• Tube coating processes that work with under pressure.
In the second case – to generate a low vacuum – a side channel compressor is located under the head within the trolley. The blower needs a 230V power connection. The vacuum is controlled via a PLC. The set value can be either the vacuum level in mbar or the speed of the motor. The company has also developed a die head which it says overcomes problems inherent in making ABS pipe. “In the past, a standard PVC head was used for ABS pipe production,” said Josef Dobrowsky,
managing director of Conextru. “This led to process and quality problems for the pipes.” This was caused by large volume and long
residence time – leading ultimately to a burnt inner surface. Conextru’s PO 250 ABS spiral head system allows easy installation of air ducts through the head to remove hot air from inside the pipe – for internal cooling. ABS needs a very uniform temperature of outer as well inner parts of the head, he said. The PO 250 ABS maintains material perfor- mance and allows uniform flow with low eccentric- ity of the wall through several methods, he says. Internal cooling reduces the inner temperature
to prevent burning, while a slow air flow – and way it is distributed inside the head – helps control the temperature.
Crosshead options Maillefer says that its new ECH 5/10 F crosshead can be used to extrude small diameter fluoropoly- mer medical tubes, with high precision and quality and long production runs. The single-layer crosshead’s design and con- struction ensure long production runs with a high resistance to corrosion. It also includes an air injection system. Three heating zones allow
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