Windmöller & Hölscher, Lengerich, Germany, recently developed the AD proFilm MP film valve sack which is manufactured on the AD PLASTIC 2 valve bottomer. This machine, launched in 2015, is unusual in that it uses hot air to seal the sacks. This means it does not require adhesives, which can be a source of significant production costs and technical process limitations. This latest sack design ensures high moisture protection and extended product shelf life. It achieves this through the use of innovative ‘breathing chamber technology’, whereby a ventilation chamber is incorporated along the longitudinal seam of the sack. “This technology means that effective ventilation and high moisture protection are no longer mutually exclusive,” explained Uwe Köhn, head of processing products at W&H.

 

Valve sacks have the important benefit of being able to be filled on nozzle packers, which ensure a high filling output. However, although paper, woven plastics and plastic film sacks all have this one factor in common, each material has its own specific advantages. Paper valve sacks are a comparatively cost-effective form of packaging made from a renewable source; woven plastic valve sacks are very lightweight and tear-resistant; film valve sacks, on the other hand, provide excellent moisture protection and advertising on them is more effective as they hold print so well, a key factor especially in the field of premium packaging. W&H offers machine solutions tailored to each of the three concepts, and so can always provide the right machine for any  valve sack application. www.wuh-group.com 

 

 

AD PLASTIC 2 machine for film valve sacks requires no adhesives as it seals the sacks with hot air; whether (below) valve sacks are made from paper, film or woven plastic, W&H can provide a filling machine to match