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Ultrasonic welds incorporate valves into bags

Bosch Packaging Technology wanted to develop a machine that could apply and install venting valves into bags without altering the bags’ appearance. Here’s how they managed to do so.

The CVA VIS valve applicator (shown) produces a finished bag whose venting valve does not mar the bag’s appearance.
The CVA VIS valve applicator (shown) produces a finished bag whose venting valve does not mar the bag’s appearance.

In addition to its familiar competencies in filling, processing, and packaging equipment, Bosch Packaging Technology offers packaging solutions to cargo and bulk materials companies in the food industry. In this space, a chief concern is maintaining consistent, uncompromised quality in sensitive products, namely whole bean or ground coffee. But in the process of packaging such products, important characteristics like aroma are prone to be adversely affected.

So Bosch developed the VIS flavor protection valve to protect the flavor of the packaged coffee, even after prolonged storage. This VIS valve, installed inside the bag in this case, permits degassing into the environment. The valve also prevents external oxygen, which can compromise coffee quality and aroma, from entering the package.

To apply this valve into film, the company developed its CVA VIS valve applicator machine. Running with an output of as many as 120 valves/min on film as wide as 500 mm, this intermittent-motion machine can stand alone or can be integrated into a number of Bosch f/f/s machines to feed “valved” film into the f/f/s for coffee filling and sealing applications like this one.

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