For the top and bottom end processing, the spiral wound and cut to length can body is fed to a flanging machine. The flanger forms the open cut edge depending on the requirements for the final packaging:
bead / curl to the outside or inside for subsequent heat-sealing of an aluminum or plastic membrane
calibrating / widening the can for insertion of a deep-drawn membrane
flange to the outside for closing with a metal end
Various versions are available at Blema, depending on product dimensions and performance requirements.
The upper opening of composite cans is usually closed with a membrane made of aluminum or plastic. This achieves a gas-tight seal with a high consumer-friendliness due to the low opening forces.
Regarding the design of the closure there are two commercially available variants:
1. flat membrane sealed onto bead (VRZS)
products: Stacking chips, bulk goods
2. deep-drawn membrane sealed into can body (VRS)
products: cut tobacco, milk powder, instant beverages, cocoa, coffee and other powdered products, sauces, etc.
All Blema sealing machines work in the tried and tested thermal contact method. This guarantees maximum process stability with low maintenance costs and easy handling. The turret design enables long sealing times for a secure fusion of membrane and can.
The machines are able to process round and non-round (square, rectangular, oval) formats.