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ePaper created 2015-02-11, 12:44:50 | version 1.34.01
P|14 Progress content against potential damage from exterior factors. Paper bags resist mechanical stress and moisture mainly due to their assembly in several layers, thereby protecting materials like mortar or cement for instance foils, this also extends the shelf life for the building ma- terials – another major criterion for manufacturers who frequently use the cold season for producing large vo- lumes of these materials as stock reserves. Bags come in various unit sizes – ranging form 5 kg bags for the DIY trade, to 50 kg bags for construction sites. They are closed by sealing tape or valve, often equipped with outer antislip coating to facilitate safe transport. The cuboid shape also ensures good stack- Manufacturing process: “High-tech paper bag” To what extent a paper bag is a high-tech product be- comes clear very soon when examining its manufactu- optimised for strength, foils on polyethylene (PE) basis, and powerful industrial adhesives. The bags are ma- nufactured on high-tech machines which usually ope- rate in two-stage processes. from the reel, to form a tube. The PE web here forms the bag inlay, and this is attached to the paper web using an adhesive. It prevents slippage of the inlay du- ring production while also ensuring a tight seal of the The adhesives of choice for this step are dispersions. They achieve a reliable bond of paper and foil, are downline processing of the sack blanks in this high- speed manufacturing process. In the second production step, the tubular blanks now are closed at top and bottom. The typical method of creating a closed paper bag from the tubular shape is to bottoms are reinforced using another patch of paper, to increase the weight resistance of this part of the bag Industry Paper | PackagingP