Paper bag
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A paper bag is a bag made out of paper. Paper bags are commonly used as shopping bags.
History
In 1852 Francis Wolle, a schoolteacher, invented the first machine to mass-produce paper bags.[1] Wolle and his brother patented the machine and founded the Union Paper Bag Company.
In 1871, inventor Margaret E. Knight designed a machine that could create flat-bottomed paper bags, which could carry more than the previous envelope-style design.
In 1883 Charles Stilwell patented a machine that made square-bottom paper bags with pleated sides, making them easier to fold and store.[2] This style of bag came to be known as the S.O.S., or "Self-Opening Sack."[3]
In 1912 Walter Deubener, a grocer in St. Paul, Minnesota, used cord to reinforce paper bags and add carrying handles. These "Deubener Shopping Bags" could carry up to 75 pounds at a time, and became quite popular, selling over a million bags a year by 1915. Paper bags with handles later became the standard for department stores, and were often printed with the store's logo or brand colors.
Plastic bags were introduced in the 1970s, and thanks to their lower cost, eventually replaced paper bags as the bag of choice for grocery stores.[4] With the trend towards phasing out lightweight plastic bags, though, some grocers and shoppers have switched back to paper bags.[5]
Production
Standard brown paper bags are made from kraft paper. Tote-style paper bags, such as those often used by department stores or as gift bags, can be made from any kind of paper, and come in any color.Paper bags can be made from recycled paper, with some local laws requiring bags to have a minimum percentage of post-consumer recycled content.[6]
Single layer
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Paper shopping bags, brown paper bags, grocery bags, paper bread bags and other light duty bags have a single layer of paper. A variety of constructions and designs are available. Many are printed with the names of stores and brands. Paper bags are not waterproof. Types of paper bag are: laminated, twisted, flat tap. The laminated bag, whilst not totally waterproof, has a laminate that protects the outside to some degree.
Multiwall paper sacks
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Multiwall (or multi-wall) paper sacks or shipping sacks are often used as shipping containers for bulk materials such as fertilizer, animal feed, sand, dry chemicals, flour and cement. Many have several layers of sack papers, printed external layer and inner plies. Some paper sacks have a plastic film, foil, or polyethylene coated paper layer in between as a water-repellant, insect resistant, or rodent barrier.
There are two basic designs of bags: open mouth bags and valve bags. Apon open mouth bag is a tube of paper plies with the bottom end sealed. The bag is filled though the open mouth and then closed by stitching, adhesive, or tape. Valve sacks have both ends closed and are filled through a valve. A typical example of a valve bag is the cement sack.
Recycling
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Paper bags are readily recyclable. Plastic or water-resistant coatings or layers make recycling more difficult.[citation needed]
See also
References
- ^ "Patent US9355". Retrieved March 6, 2013.
- ^ "Charles Stilwell". Ohio History Central. Retrieved 2015-06-10.
- ^ http://www.moma.org/learn/moma_learning/margaret-e-knight-and-charles-b-stilwell-flat-bottomed-paper-bag-1870s-1880s
- ^ Ball, Jeffrey (2009-06-12). "Paper or Plastic? A New Look at the Bag Scourge". The Wall Street Journal. Retrieved 2015-06-11.
- ^ Pereira, Andrew (2015-06-09). "Oahu's bag ban includes exemptions and substitutes". KITV.com. Retrieved 2015-06-11.
- ^ "California - Bag Legislation". BagLaws.com. 2014-09-30. Retrieved 2015-06-11.
Books
- Yam, K. L., "Encyclopedia of Packaging Technology", John Wiley & Sons, 2009, ISBN 978-0-470-08704-6
