Press Information

Georg Kaufmann Formenbau AG
01. April 2009

Varysoft®: soft-touch exactly where it is needed

Fig. 1. The Varysoft® slide-table mould is utilized on an injection moulding machine equipped with two injection units; when the mould closes for the second time, the remaining gap between the decorative material in the right-hand stationary mould half and the PP supporting structure in the left-hand moving mould half is filled with foam.
Photo: Georg Kaufmann Formenbau, Busslingen/ Switzerland

 

Fig. 2: The two cavities of the Varysoft® slide-table mould feature different geometries, permitting the production of a soft-touch layer of foam exactly where it is required in the part and also in the desired thickness, as the cross-section on the right clearly shows
Photo: Georg Kaufmann Formenbau, Busslingen/Switzerland

 

Busslingen, March 2009. –  The innovative Varysoft® slide-table mould developed by Georg Kaufmann Formenbau AG, Busslingen/Switzerland, enables the production of particularly comfortable passenger compartment parts: it is now possible, for the first time ever, to vary the thickness of the layer of soft-touch foam via the mould geometry.  The Varysoft® layer of foam is produced exactly where it is required in the part and also in the desired thickness.  To this end, the slide-table mould is equipped with two cavities, one for the conventional injection moulding of the supporting structure and one for the preforming of the decorative material – film, fabric or imitation leather – and, later, the moulding of the Varysoft® layer of foam.

Suitable for TPE und PUR foam

The mould necessitates the use of an injection moulding machine equipped with a sliding table.  A standard injection unit injects the material – usually a polypropylene (PP) – for the supporting structure.  For the production of the layer of foam, the machine may be equipped either with an additional injection unit for expandable thermoplastic elastomer (TPE) or with a polyurethane (PUR) processing unit with PUR mixing head.

In the two-stage Varysoft® process, the pre-cut decorative material is placed in the second cavity of the open mould and fixed in place. The mould then closes and the decorative material is preformed, while in the first cavity the PP supporting structure – for a door trim, for example – is moulded by a conventional injection moulding process and then cooled.  When the mould opens, the PP supporting structure remains in the moving mould half and the pre-formed decorative material remains in the stationary mould half.

The two halves of the open mould are then repositioned by means of the sliding table in such a way that the PP supporting structure and the preformed decorative material are opposite one another. When the mould closes, a gap remains between the supporting structure and the decorative material corresponding to the desired thickness of the Varysoft® layer of foam.  This thickness is determined by the geometry of the second cavity of the stationary mould half. It is deeper than the geometry of the first cavity by a distance equal to the desired thickness of the foam.


This gap is now filled with foam by the second injection process.  The expandable TPE is injected into the gap via a special gating system and diverter mounted on top of the mould, while in the case of PUR foam the mixing head is docked up against the underside of the mould. Upon completion of the foaming process, the finished Varysoft® door trim can be removed from the mould and any surplus decorative material trimmed either manually or automatically with a punching tool.

Further information:
Roger Kaufmann,  Georg Kaufmann Formenbau AG
Rugghölzli 3,  CH-5453 Busslingen/Switzerland
Tel.:  +41 (0) 56/485 65 60,  Fax:  +41 (0) 56/496 54 00
E-Mail:  r.kaufmann(at)gktool.ch
Internet:  http://www.gktool.ch

Editorial contact and voucher copies:
Dr. Diether Burkhardt,  KONSENS Public Relations GmbH & Co. KG,
Hans-Kudlich-StraĂźe 25,  D-64823 GroĂź-Umstadt
Tel.:  +49 (0) 60 78/93 63-0,  Fax:  +49 (0) 60 78/93 63-20
E-Mail:  mail(at)konsens.de


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0    Text deutsch 2009-0040 (Size: 68 K, Type: doc)
1    Text English 2009-0040 (Size: 70 K, Type: doc)
-1    Bild/Picture 1 2009-0040 (Size: 217 K, Type: jpg)
-1    Bild/Picture 2 2009-0040 (Size: 264 K, Type: jpg)