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The “Goliath” manufacturing system, newly developed by the German startup Teu2tec GmbH, allows quick 3D printing of large-format objects from any sort of granules utilizing the paste extrusion modeling course of (PEM). The system makes use of basic two-component polyurethane binders with quick curing instances and granules with grain sizes as much as 2,00 mm for this objective. Because of the quick curing of the fabric (< 10 s), this technique ensures each economical manufacturing and nearly limitless design freedom. By adapting the binders and supplies used, the product properties will also be flexibly adjusted. All merchandise to be manufactured can thus be made to remedy elastically or firmly.
PEM printing technique
For this mission, Teu2tec used elastomer-based (EPDM) granules and polyurethane binder because the processing supplies. The purpose of the mission was to develop a system that enables exact mixing and dosing between each parts and produce high quality printed layers that meet high-quality necessities.
The particular design of the printing head allows the printing of extremely viscous pastes. “Because of the very quick pot lifetime of fewer than 10 seconds, we will presently work right here with printing speeds of as much as 300 mm/s, with a mass circulation of as much as 100 g/s. That, already, could be very spectacular!” defined Jens Mikus, growth engineer at Teu2tec.
The layer top will be adjusted from 3 mm to 12 mm, which not solely allows quick printing processes but in addition, because of the low layer top, optically complicated parts will be realized. At 2200 x 2200 x 2000 mm, the amount is massive sufficient for use, for instance, to design furnishings or full playground gear for city growth.
Discontinuous and underwater printing
In an preliminary check collection, the Teu2tec group has already succeeded in setting down and repositioning the print head throughout the energetic printing course of. With the method expertise used, an interruption of the extrusion throughout the additive course of is realized and repositioning is made attainable with out additional printing paste leaking from the nozzle.
The primary printing checks underwater have been accomplished because the starting of 2022. It’s already turning into clear that the method, with applicable binder programs, allows the printing of parts underwater. On this means, the sector of utility is considerably expanded and classifies this printing course of as a extremely versatile and distinctive manufacturing course of. The Teu2tec group is presently in search of companions to additional develop the expertise, to pilot the manufacturing course of and for buyers.
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