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Article | November 30, 2004
Film properties benefit Sengewald in Germany
Appearance, tear resistance, and peel properties are key benefits of a top film web used for thermoformed packs of surgical drapes and gowns sold primarily in Europe.
The packager: Sengewald Klinikprodukte GmbH & Co. KG Rohrdorf Germany manufactures surgical drapes and gowns. These sterile medical products are filled and heat-sealed on as many as 10 different thermoform/fill/seal machines.
The challenge: “We had the goal of replacing [a previous top web structure’s special medical] paper” says Wolfgang Spindler research and development manager at Sengewald. “We wanted better peel properties more comfortable handling and puncture and tear-resistance.”
The solution: Through its partnership with Rollprint Packaging Products and Pactiv’s “sister” company Kobusch-Sengewald in Germany Sengewald selected Rollprint’s high-density polyethylene AllegroT coextruded top web. The peelable 3.5-mil coextruded blown film consists of two layers of white HDPE plus a thin sealant layer that employs a proprietary easy-peel sealant technology.
The benefits: Better peel properties appearance handling and tear resistance; visual confirmation of package seal integrity; eliminated the possibility of paper fiber contamination.
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“No new machinery was necessary and now we have a package with only plastic materials which is an additional benefit” says Spindler.
Printing advantages: Not only does the new all-film package offer fiber-free peeling and improved durability the HDPE-AllegroT material is more accommodating to graphics with its smooth opaque white surface.
"Paper has a rough surface" notes Spindler. "When you print on it you don’t typically get sharp print edges. Printing on film however [with its] brighter surface—[creates] a more brilliant white. The print looks much sharper and we get a ‘cleaner’ impression." He says the film for these medical packs is flexo-printed with a corporate design and user information.
Bottom web benefits: The redesign of the top web meant it was no longer necessary for the bottom web to carry the peel function. That eliminated the multi-step manufacturing of the formable adhesive-laminated nylon film/peelable coextruded sealant film bottom web. For its bottom web
Sengewald now uses a coextruded nylon/PE forming web from Kobusch-Sengewald that retains the thermoforming and durability characteristics of the previous bottom web. The new bottom web helps achieve cost savings because it can be manufactured in a single step utilizing in-house equipment at Kobusch-Sengewald.
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