Groche Technik GmbH

Screws

We manufacture screws as individual as your plastics. They are performance optimised, highly resistant to wear and corrosion-proof. Our screw production can meet your requirements from Ø 12 – 200 mm, up to a length of 5000 mm. In order to minimise friction, the manufacture of screws for plastic processing machines sets a high standard on the production process as far as finishing precision and surface consistency is concerned. The screw has the task of drawing in the granular plastic, to continously convey, to compress and to perfectly homogenise it in the output area. Groche screws have an exact geometry, which is suited to the relevant demands and areas of the application. + Ø 12 – 200 mm + Length up to 5000 mm + High wear resistant + Corrosion resistant + Individual geometries + Optimised coating

Barrels

We manufacture barrels in high wear and corrosion resistent quality from Ø 12 – 200 mm, up to a length of 5000 mm. The barrels tasks are static. They have to cope with high levels of pressure and tension when thermally loaded. Borehole surfaces must resist wear and corrosion caused by the processed plastics. The barrel feeding zone can be optimised for each individual application. Our production includes the manufacture of thermoplastic, extrusion, thermoset, silicone and elastomer barrels in the optimal qualities. + Ø 12 – 200 mm + Length up to 5000 mm + High wear resistant + Corrosion resistant + Optimised feedingzone + Individual designs

Screw-tip-sets

The screw-tip-set is the heart of the plasticising unit. Screw-tip-sets must close safely and should allow a constant mass cushion in order to guarantee high repeatability to ensure even dosing. There are no good or bad screw-tip-sets, only suitable and unsuitable ones. Screw-tip-sets by Groche aim to achieve minimal wear and a long service life. + High wear resistant + Corrosion resistant + Special geometries + Extensive stock + Optimised coating

Plasticizing units

Micro Injection Moulding GTM

More and more injection moulding companies are facing the challenge that the ratio between the large installation dimensions of their moulds does not match the small injection volumes of the cavities. In these cases, the user has to resort to a large injection moulding machine with an oversized injection unit. Thermally damaged plastic and inaccurate control of the non-return valve are frequent results. Groche Technik has developed the GTM unit for these applications. With the GTM unit, the required injection volume is plasticised in an injection chamber with a reduced cross-section and injected using a specially developed piston screwtip. This allows the volume to be reduced by approx. 30%. In order to achieve an even shorter residence time, Groche Technik can carry out geometry modifications for the barrel and screw. Depending on the type and application, the plastic volume in the barrel can be reduced by up to 50%. A reduction in injection force is required before the GTM unit is commissioned. + Volume reduction of approx 30% possible + Mass cushion is formed in the injection chamber + Reduction in residence time + Lower thermal load on the material + Compatible with almost any injection moulding machine + Usually no need to use microgranulate