MACHINERY | PIPE JOINING
Ultrasonics allows welding with recyclate
Ultrasonic welding specialist Her- rmann says it has carried out tests to show that the technique can be used on products made from recyclates. “Whether – and how well – 100%
recyclate can be welded depends on the material in question,” said Jochen Ochs, head of application technology for plastics at Herrmann. “It is difficult to make a general statement because each recyclate is different – and multiple melting can have a negative effect on the material properties.” The company made test specimens
from a regranulate and managed to produce good welded joints on them. “In principle, we are able to weld
100% recyclate with ultrasound.” The objective of the tests was to
compare a standard polyamide with a recycled one. First, Herrmann found a supplier – Barlog – that could supply regranulate. It could then compare test specimens. “We then set up a statistical design
of experiment (DoE) with 18 different parameter groups, tested tensile samples and compared them,” he said.
With the quick mounting system, the clamps can be replaced easily. The chassis/carriage, without
the RH and LH pipe-aligning clamps, can be removed from the steel frame by simply loosening four mounting screws – then used in areas that are hard to reach. Operation of the clamps for the straight pipe and
saddle fitting – and the movement of the carriage for the latter – are implemented by ergonomically designed handwheels. The motion handwheel can be easily removed, to move the clamping chassis/ carriage with a common power tool (such as a cordless drill or screwdriver) as its drive.
Welding range At K2022, PFS of Germany, showcased a range of its electrofusion units for pipe welding. Its Mammoth is its most powerful electrofusion
Right: Mono- matic-type units from PFS have been developed for use with SmartFuse- compatible parts
unit. Here, the inverter unit is operated with three-phase alternating current and enables simultaneous welding of parts with bifilar heating coils thanks to the tandem mode. Its Monomatic-type units have been developed for use with SmartFuse-com- patible parts. The welding parameters are entered automatically after a SmartFuse-capable part has been connected. It also exhibited its Tiny unit – which it says is not so small. While the internal technology is packed into a compact metal housing, it can weld larger parts. The company says it is ideal when a lot of power is required from a small housing. It can handle pipe
40 PIPE & PROFILE EXTRUSION | November/December 2022 Herrmann created cross-section
views after each welding process. Initially, it was apparent that the recyclate looked worse in the cross section – with a parting plane visible between the upper and lower parts. The virgin material showed a more homogeneous weld, with no parting planes visible. In early tests, the company found a parameter set that was suitable for both materials. After creating a DoE for this parameter set, five parts were welded – each with different parameter configurations.
diameters up to 630mm, depending on the transformer type.
Pressure joining Italy’s Ritmo exhibited a range of its plastic welding equipment at K2022. Its Electra S is a polyvalent welder, characterised by its low weight and high power – and available in 230V or 110V. With the Electra S it is possible to process fittings up to 200mm (230 V version) or 315mm (110 V version) internal diameter, for pressure pipe made of PE, PP or PP-R. The device has an internal memory for more than 4,000 welding records – which can be read via the USB interface in PDF, CSV and BIN formats. For the BIN format, it requires Ritmo Transfer software. Via the USB interface, it is possible to update the firmware of the welding unit to update or to connect an ESC-POS printer for immediate printing of the protocols. Its Elektra 315 is a polyvalent electrofusion machine for pipes and fittings for the transport of fluids such as gas and water. It complies with relevant international directives, says
Ritmo.It can store 500 logs – in PDF formet – which can be transferred to a PC/laptop. Finally, its Basic 160 Easy Life performs the welding cycle automatically thanks to the Easy Life control unit. The repeatability of the welding cycles is guaranteed by the system electronics, says the company.
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www.pipeandprofile.com
IMAGE: PFS
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