Reduced glue consumption in paper sack production

With W&H’s digitally controlled glue application system for paper sack lines, dy-pack has reduced its glue consumption by more than 30 tpy. dy-pack installed its first W&H bottomer with integrated digital pasting technology in 2008. In 2015, another paper sack line with the innovative paste application system was commissioned.

Since then, on four production lines, dy-pack has produced 150 million paper sacks for major industrial customers, who are competing in the building materials, chemicals, and food industries.

Before 2008, the paper valve sacks were glued exclusively with the use of conventional ‘stamp technology.’ In this process, glue is transferred to the paper sack via glue pads. dy-pack commissioned the W&H bottomer to apply glue directly to the paper, using digitally controlled valves and nozzles.

“Digital pasting by W&H reduced our glue consumption by 30% compared to conventional systems,” said Wilhelm Dyckerhoff, Managing Partner at dy-pack. “This means cost savings, higher efficiency, and better sustainability.”

“Digital pasting reduces glue consumption because glue is applied much more precisely to the bag by the nozzle system,” said Dr Benedikt Sitte, Head of the Division for Converting Machines at W&H. “Moreover, the glue quantity is kept constantly low over the entire machine speed range. Digital pasting also improves sack quality, reduces job times, and simplifies job preparation.”

Based on its investment in the W&H technology, in 2015 dy-pack was able to benefit from a low-interest efficiency loan, provided by the NRW.Bank for resource-conserving production. “The efficiency gain of an investment in terms of resource consumption must be proven for support through environmental promotional programmes,” said Marcus Lodde, Financing Expert at the NRW Efficiency Agency. “Depending on the selected promotional programme, companies can apply for a financing subsidy or a low-interest loan. Such environmental promotional programmes also exist in other federal states, locally, or at EU level.”

W&H is a world leader for machinery and systems for the manufacturing and converting of flexible packaging.

Read the article online at: https://www.worldcement.com/europe-cis/20122018/reduced-glue-consumption-in-paper-sack-production/