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...

Related articles:


Paper and plastic sacks provide equivalent shelf life

A recent study found that paper sacks and form-fill-seal (FFS) polyethylene sacks provided equivalent protection for cement when stored for 18 months under the same conditions. The study was conducted...


Paper sack innovations for present and future needs

In accordance with the motto “Present and future needs”, the paper sack industry held this year’s Eurosac Congress in Marseille/France from 26.05.-28.05.2016. It showcased its latest innovations...

Issue 06/2013

Influence of different sack paper porosity on filling performance

In the building material production and processing industry, various powdery products for a variety of purposes are packed into flexible packaging, in small to large quantities. Depending on the needs...

Issue 8/2023 STARLINGER

Approaching the record of 200000 sacks per day

Crafters Polypropylene Packages (PVT) Ltd., the woven plastic packaging producer based in Karachi, Pakistan, installed two ad*starKON HX easy-open block bottom sack conversion lines from Starlinger &...

Issue 12/2014 REPASACK

Paper sack recycling loop

When the Packaging Ordinance came into force on 01.01.1993, the German economy was bound by law for the first time to return packaging after use and play an active role in its disposal. Since then the...