Schenefeld, Germany- In the powder producing industry there is increasing demand for different types of sack packaging with the aim of catering for client-specific requirements. In particular, it is a well-known fact that some consumers prefer paper sacks, while others prefer plastic sacks. Because contamination aspects impose serious limitations on the extent to which valve sacks, where switching between paper and plastic sacks is very simple, can be used for pure products, e.g. food, the problem of changing sack material relates primarily to the open-mouth sack. Since there is often only one bagging machine in a factory, or great flexibility is required when there are more than one, it must be possible for one machine to fill different types of sacks. As a rule this does not pose any problems for the filling operation itself, but it does for closing, since the sack closure and the machine required for it are usually determined by the sack type. Sewing machines have long been used to close a broad spectrum of sack types, but today the requirement is usually for higher-grade closures, making it necessary to ensure availability of the machines needed for the purpose, some of which are highly specialised. For space and cost reasons, combined sack closing machines for two or more types of closure are desirable. In the past this has rarely been put into practice.
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