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Transformation of uniform web from flexible laminar material to closed hose cross section for packaging bag, comprises transformations of the web to prismatic web with open cross-section and the prismatic web to web with close cross-section
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Forming shoulder for producing tubular sheet from flat sheet has shoulder section which curves flat sheet and is mounted at the top of triangular section with telescopic rails which form curved sheet into tube
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Method and device for shaping a lengthwise corrugated web
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