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Linear bearings reduce downtime

For more than 50 years, Sealstrip has been delivering package reclosure solutions to customers such as Kellogg’s, Kraft, Keebler, Pillsbury, and more.

The igus linear bearing used in Sealstrip machines.
The igus linear bearing used in Sealstrip machines.

Two years ago, Sealstrip began searching for an alternative to the metal bearings it was using, which were expensive and required frequent maintenance. By switching to DryLin R plastic linear bearings from igus, Sealstrip has lowered its costs and eliminated machine downtime for its customers.

DryLin is a series of engineered polymer linear plain bearings designed for wear-resistance and low friction.  They are designed to slide using proprietary self-lubricating solid lubricants, which eliminate the need for the messy oil and greases associated with recirulating ball bearings.

Sealstrip uses DryLin R linear bearings on two different machines. The first is the Sealstrip Applicator (photo included here), a self-contained system that interfaces with a customer's flow wrapper to automatically add to the packaging film the unique package reclosure component that is Sealstrip’s calling card. The machine uses twelve DryLin R linear bearings to deliver oscillating movement for the machine parts involved. This enables the Sealstrip Applicator to add to the film an easy-to-open, re-sealable feature in the direction of the film flow. The result: a package that opens and reseals from end-seal to end-seal every time.

The second machine, Sealstrip’s FreshPak applicator, applies the company’s trademark FreshPak tape to the packaging film. At the same time, the applicator also die cuts the packaging film underneath the FreshPak material to form a wide-mouthed opening on each package. This machine uses sixteen DryLin R linear bearings to facilitate the movement of the system's die station.

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