KM, Teknor Apex to present TPV technology at NPE

London – KraussMaffei will demonstrate its SpinForm swivel plate technology for producing multi-component moulded parts at the NPE trade show, 23-27 March in Orlando, Florida.

The mouldings will be made from compounds based on thermoplastic vulcanisates (TPVs) from Teknor Apex. The Sarlink TPVs can replace thermoset rubber – EPDM and polyisoprene – for the sealing side of the application due to processing flexibility.

At the Orlando plastics industry show, KM will over-mould the TPV gaskets on a CXW 300-1000/750 SpinForm unit with linear robot LRX-S150.

The equipment will have a clamping force of 337 US tons and two injection units with 2.17 and 1.97 in. screw diameters. Shot weights will be 4.27 and 3.81 oz. Cycle time will be 12 seconds.

In SpinForm technology, the knit-path parting lines are located one behind the other, and the injection units are opposite one another on the machine axis. A turntable, known as the spin unit, which rotates about the vertical machine axis, is located in the centre.

The technology starts with the first and second component being injected into the mould in parallel. The resulting preform from the first component remains on the core of the spin unit's ejector side when the mould is subsequently opened.

The spin unit then turns through 180°, and the preform is turned into the new cavity and over-moulded with the second component