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The historical evolution of Kraft paper bag
- Aug 13, 2018 -

As early as 19th century, when large retailing was not yet in existence, people usually procured all their daily items in grocery stores near work or residence. It is a headache to see how they are sold to consumers sporadically after they are packed in barrels, bags or wooden cases, and are transported to the grocery stores in bulk. People can only go shopping with baskets or homemade linen bags. At that time, the raw material of papermaking is still jute fiber and the old linen head, the quality is inferior and the quantity is scarce, even can not meet the demand of newspaper printing. Before and after 1844, German Friedrich Colle invented wood pulp papermaking, greatly promoted the development of paper industry, but also indirectly spawned the history of the first commercial paper bag. 1852, American botanist Francis Waller invented the first paper bag making machine, which was later promoted to France, Britain and other European countries.

Later, the emergence of plywood paper bags and the progress of paper bag stitching technology made the cotton bags used for bulk cargo transport replaced by paper bags. And the first shopping with Kraft paper bags, it was born in 1908 in St. Paul, Minnesota, USA. A local grocery store owner, Watt Duvina, has started looking for ways to get consumers to buy more at once, in order to boost sales growth. Duvina that it should be a prefabricated bag, cheap and easy to use, and at least 75 pounds of weight. After repeated trials, he locks the texture of the bag on Kraft paper, because it uses wood-fiber-long coniferous pulp, which is treated in the cooking process by chemically mild caustic soda and trisodium chemicals, making the original strength of the wood fibers less damaged, and thus the resulting sheet, The fibers are tightly connected, paper tough, able to withstand greater tension and pressure without rupture. Four years later, the first shopping was born with a Kraft paper bag. It is rectangular at the bottom and has a larger volume than the traditional V-type bottom paper bag. A rope runs through its bottom and sides to increase its load-bearing capacity and to form two pull rings on the upper end of the paper bag for easy lifting. Duvina named the shopping bag in his own name and patented it in 1915. At this time, this shopping bag's annual sales volume has exceeded 100 million.