TSE Troller AG - Coating Technology - Precision Tools and Machinery

TSE Troller AG, located in Murgenthal, Switzerland, have, since 1961, manufactured coating dies for applying single and multi-layer liquid films on a wide variety of flexible base types.

Our engineering, design and shop staff includes experts with over 20 years of practical industrial experience in coating technology. We have proprietary design tools for optimising pre-metered coating equipment and processes to customer requirements. Our shops manufacture highest quality dies up to 4.5m (177in) coating width with outstanding gap accuracy.

CURTAIN COATING APPLICATION IN THE PAPER INDUSTRY

Curtain coating in the slide (multi-layer) or slot (single-layer only) format is being increasingly used for special paper coatings because of its capabilities: copious simultaneous layers, high coating speed and large die-to-web clearance. The advantages of the pre-metered methods associated with simultaneous multi-layer application yield a more accurate and uniform coating weight, with fresher and cleaner coated liquids.

HIGH PRECISION SLIDE DIES FOR CURTAIN COATING

Curtain coating in the slide format is being adopted increasingly by large segments of the coating industry because of its high productivity, multi-layer capabilities and robustness with respect to web disturbances. The curtain coating concept is simple enough; allow a liquid layer falling from a die edge to impinge on a moving web. However, the realisation of excellent coating quality with this method demands optimal die design coupled with precision fabrication: both are TSE's strengths.

As with all pre-metered coaters, the production of a uniformly distributed flow via the internal flow manifold requires both optimal manifold design and excellent slot depth uniformity. The curtain lip also must be designed to resist irregular wetting and the teapot effect. Furthermore, lip fabrication uniformity is essential for excellent coating uniformity.

TSE has developed the essential supporting technologies and designs associated with capable curtain edge guides, coating initiation / termination functions and devices that protect the liquid curtain from the detrimental effects of air currents.

COATING STATIONS WITH DIE SUPPORT AND COATING ROLL

A coating station is the foundation for the coating application process in that it provides the mechanical support and positioning functions as well as auxiliary systems required for a successful coating process.

TSE supplies coating stations ranging from small, flexible laboratory development coaters to large, ultra-high precision production units. In all cases these stations feature world-class TSE coating dies matched with backing rolls and positioning systems of comparably high precision.

Overall design of the coating station supports the precision and uniformity of the coating process yet productivity of the station is also an important design consideration. TSE station designs allow minimum product change time, provide appropriate process adjustments, allow ready access for operations and maintenance, and in some designs even provide quick exchange of coating die assemblies.