The historical reform of kraft paper bag making

Back in the 19th century, before retail was born, people purchased all their everyday items from grocery stores near work or residence. Packed in wooden barrels, cloth bags or wooden boxes, after a large number of them are shipped to grocery stores, it is a very troublesome thing to sell them scattered to consumers. People can only go out shopping with homemade burlap bags. The raw materials for papermaking are still jute fibers and old linen heads, which are of poor quality and scarce in quantity, and cannot meet the needs of newspaper printing at all. Around 1844, the German Friedrich Kohler invented wood pulp papermaking, which greatly promoted the development of the paper industry and indirectly gave birth to the first commercial handbag in history. In 1852, American botanist Francis Waller invented the first paper bag making machine, which was subsequently extended to France, Britain and other European countries. Later, the birth of plywood paper bags and the advancement of paper bag sewing technology made the cotton bags used for bulk cargo transportation in the past to be replaced by handbags.

When it comes to the first shopping kraft paper bag, it was born in St. Paul, Minnesota, USA in 1908. To boost sales, Walter Duviner, a local grocer, started looking for ways to get consumers to buy more at once. Duvina believes that it should be a prefabricated bag that is inexpensive and easy to use, and can hold at least about 75 pounds. After trial and error, he locked the texture of the bag on a kraft paper bag because it was pulped from conifers with longer wood fibers, treated with milder chemicals such as caustic soda and sulfide alkali during cooking, The original strength of the wood fiber is less damaged, so the final paper produced has tight connections between the fibers, the paper is tough, and can withstand greater tension and pressure without breaking. Four years later, the first kraft paper bag for shopping was born. It has a rectangular bottom and has a larger volume than traditional V-bottom paper bags. A rope runs through its bottom and sides to increase its load-bearing capacity, and two pull loops are formed on the upper end of the paper bag for people to carry. Duviner named the shopping bag after himself and patented it in 1915. At this time, the annual sales of such shopping bags have exceeded 100 million.