Process for the manufacture of a structure of positively connected corrugated and flat sheets of thermoplastic material

Abstract

Abstract A process for manufacturing a structure is described which consists of corrugated and a flat sheet or film of thermoplastic material, which sheets are positively connected by matching depressions with undercuts arranged along the grooves of the corrugated sheet and at corresponding points of the flat sheets. The structure is especially suited to make inserts for trickling-filter towers. Matching depression are produced simultaneously in the flat and the corrugated sheet in their areas of contact, and the depressions are then compressed whereby an undercut positive connection is formed. The device may be operated continuously or intermittently, its main part consisting of the tool for making the positive connections. Said tool comprises as the essential parts a series of female molds designed to fit in the grooves of the corrugated sheet, and a counteracting plug. In the female mold a spring-loaded punch is guided. To form the positive connections in the plug advances into the female mold against the spring-loaded punch, and thereby depressions are formed in the corrugated and the flat sheet which are guided one upon the other through the tool. As the plug retracts, the spring-loaded punch advances to compress the depressions whereby the undercut is formed and the sheets are firmly connected.

Inventors

• 👤 P Gumm
• 👤 K Krubig
• 👤 J Lohmann
• 👤 J Zimmermann

Bibliographic Details