Process Know-how

Multiwall paper valve sacks – a quality product for packaging of building materials

Multiwall paper sacks (vulgo: bags) are produced in a range of styles, the most important being sewn or pasted side-gusseted sacks and pasted ­cross-bottom sacks. These two basic types are produced both in the form of open mouth and valve sacks. The paper sack market is characterized by a large range of diverse valve types, particularly in the retail building product segment, but only a few basic types are found in the field of cement. This article examines in more detail the sack machines available and the special types for the building materials sector.

1    Introduction
The general public...

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