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In China / Vacuum solutions / Application stories / Envelope manufacturing

Envelope manufacturing

One application in printing and paper that requires a steady supply of vacuum is envelope manufacturing. Envelope manufacturing machines apply vacuum to small holes in metal rollers that hold and convey the envelopes through the machines. The deeper the vacuum level, the more holding force is generated.

Printing and paper
Atlas Copco sees an increasing number of requests to install (vacuum and low pressure) system upgrades for this particular application. For these upgrades, companies with envelope manufacturing machines ask to replace dry vane pumps and root blowers with rotary screw vacuum systems. Usually, the primary driver for a vacuum system upgrade at an envelope factory or a bindery is energy reduction. Other reasons for customers to request an upgrade include: increasing reliability, providing redundancy and increasing production speed.

Increased production speed is a demand where rotary screw vacuum systems outperform other vacuum systems. With envelope machines, faster machine speeds drive the need for better vacuum. The performances of dry vane and roots blower systems do not come up to the mark as vacuum levels go deeper than -0.6 bar(g). Some customers are now demanding -0.7 bar(g) and that means that Atlas Copco’s GV oil-sealed rotary screw vacuum systems are ideal.

The GV delivers consistent performance over any vacuum range needed by printing type applications. Vanes wear down with frequent use, jeopardizing performance and reliability. At the heart of the GV, Atlas Copco’s time-tested screw elements run on where vanes give up. The sizes of the GV systems are not limited by technology, so we can deliver one system that suits all demands.