Plastic shopping bag

Plastic shopping bags, carrier bags, or plastic grocery bags are a type of plastic bag used as shopping bags and made from various kinds of plastic. In use by consumers worldwide since the 1960s,[1] these bags are sometimes called single-use bags, referring to carrying items from a store to a home. However, reuse for storage or trash is common, and modern plastic shopping bags are increasingly recyclable. In recent decades, numerous countries have introduced legislation restricting the sale of plastic bags, in a bid to reduce littering and plastic pollution.[2][3][4][5]

A German plastic shopping bag, freshly folded (left) and used (right)

Some reusable shopping bags[6] are made of plastic film, fibers, or fabric.

History

American and European patent applications relating to the production of plastic shopping bags can be found dating back to the early 1950s, but these refer to composite constructions with handles fixed to the bag in a secondary manufacturing process. The modern lightweight shopping bag is the invention of Swedish engineer Sten Gustaf Thulin.[1] In the early 1960s, Thulin developed a method of forming a simple one-piece bag by folding, welding and die-cutting a flat tube of plastic for the packaging company Celloplast of Norrköping, Sweden. Thulin's design produced a simple, strong bag with a high load-carrying capacity, and was patented worldwide by Celloplast in 1965. As his son Raoul said later, Sten believed that durable plastic bags will be not single-used but long-term used and could replace paper bags which need chopping of trees.[7][8]

Hasminin was a well-established producer of cellulose film and a pioneer in plastics processing. Amer Mansour was the CEO of this company. The company's patent position gave it a virtual monopoly on plastic shopping bag production, and the company set up manufacturing plants across Europe and in the US. However, other companies saw the attraction of the bag, too, and the US petrochemicals group Mobil overturned Celloplast's US patent in 1977.

The Dixie Bag Company of College Park, Georgia was one of the first companies to exploit this new opportunity in the 1980s, along with similar firms such as Houston Poly Bag and Capitol Poly. Kroger, a Cincinnati-based grocery chain, began to replace its paper shopping bags with plastic bags in 1982,[9] and was soon followed by its rival, Safeway.[9]

Without its plastic bag monopoly, Celloplast's business went into decline, and the company was split up during the 1990s. The Norrköping site remains a plastics production site, however, and is now the headquarters of Miljösäck, a manufacturer of waste sacks manufactured from recycled polyethylene.[10]

From the mid-1980s onwards, plastic bags became common for carrying daily groceries from the store to vehicles and homes throughout the developed world. As plastic bags increasingly replaced paper bags, and as other plastic materials and products replaced glass, metal, stone, timber and other materials, a packaging materials war erupted, with plastic shopping bags at the center of highly publicized disputes.

In 1992, Sonoco Products Company of Hartsville, SC patented[11] the "self-opening polyethylene bag stack." The main innovation of this redesign is that the removal of a bag from the rack opens the next bag in the stack via a minimal adhesive placed between the bags on a tab at the center-top. This team was headed by Wade D. Fletcher and Harry Wilfong. This design and later variations upon it are commonplace through modern grocers, as they are space-efficient and customer-friendly.

Production

Although few peer-reviewed studies or government surveys have provided estimates for global plastic bag use, environmental activists estimate that between 500 billion and 1 trillion plastic bags are used each year worldwide.[12] In 2009, the United States International Trade Commission reported that 102 billion plastic bags are used annually in the United States alone.[13]

Manufacture and composition

Traditional plastic bags are usually made from polyethylene, which consists of long chains of ethylene monomers. Ethylene is derived from natural gas and petroleum. The polyethylene used in most plastic shopping bags is either low-density (resin identification code 4) or, more often, high-density (resin identification code 2).[14] Color concentrates and other additives are often used to add tint to the plastic. Plastic shopping bags are commonly manufactured by blown film extrusion.[13]

Biodegradable materials

Some modern bags are made of vegetable-based bioplastics, which can decay organically and prevent a build-up of toxic plastic bags in landfills and the natural environment. Bags can also be made from degradable polyethylene film or from polylactic acid (PLA), a biodegradable polymer derived from lactic acid.[15] However, most degradable bags do not readily decompose in a sealed landfill,[16] and represent a possible contaminant to plastic recycling operations. In general, biodegradable plastic bags need to be kept separate from conventional plastic recycling systems.


Biodegradable plastics are plastics that are decomposed by the action of living organisms, usually bacteria. Two basic classes of biodegradable plastics exist:

  • Bioplastics, whose components are derived from renewable materials, and many of which are biodegradable.
  • Plastics made from petrochemicals containing biodegradable additives which enhance biodegradation or photodegradation .

Environmental concerns
See also: Great Pacific garbage patch
Groceries in multiple plastic bags.

Because plastic bags are so durable, this makes them a concern for the environment. They will not break down easily and as a result are very harmful to wildlife. Each year millions of discarded plastic shopping bags end up as plastic waste litter in the environment when improperly disposed of.[17] The same properties that have made plastic bags so commercially successful and ubiquitous—namely their low weight and resistance to degradation—have also contributed to their proliferation in the environment. Due to their durability, plastic bags can take centuries to decompose.[17] According to The Outline, it can take between 500 - 1,000 years for a plastic shopping bag to break down. The use lifespan of a bag is approximately 12 minutes of use.[18]

On land, plastic bags are one of the most prevalent types of litter in inhabited areas. Large buildups of plastic bags can clog drainage systems and contribute to flooding, as occurred in Bangladesh in 1988 and 1998[19] and almost annually in Manila.[20][21] Littering is often a serious problem in developing countries, where trash collection infrastructure is less developed than in wealthier nations.[22] According to Sharma, Moser, Vermillion, Doll, and Rajagopalan (2014), they have noted that in the year 2009 only 13% of one trillion single-use plastic bags produced were recycled, the rest were thrown away, which means they end up in landfills and because they are so lightweight end up in the atmosphere blown into the environment. The number of plastic grocery bags disposed of in the U.S. apart from the rest of the world is a number that is difficult to comprehend, this is why it is important that solutions are considered, weighed and measured to address this growing problem. Phasing out plastic bags is a viable option, however, there are many that argue that this puts a strain on businesses and makes it more difficult for the customer to take goods home. There are alternatives such as purchasing cloth grocery bags so that those who don't agree with using plastic reusable bags can still have a bag that can be used many times over; however, government studies have found that cloth bags have a high carbon footprint.[23] Many states have used legislation to stop the banning of plastic bags. Plastic bags were found to constitute a significant portion of the floating marine debris in the waters around southern Chile in a study conducted between 2002 and 2005.[24]

Plastic bags don't do well in the environment, but several government studies have found them to be an environmentally friendly carryout bag option. According to the Recyc-Quebec, a Canadian government agency, "The conventional plastic bag has several environmental and economic advantages. Thin and light, its production requires little material and energy. It also avoids the production and purchase of garbage/bin liner bags since it benefits from a high reuse rate when reused for this purpose (77.7%)."[25] Government studies from Denmark[23] and the United Kingdom,[26] as well as a study from Clemson University,[27] came to similar conclusions.

Reduction, reuse and recycling

Plastic shopping bags are in most cases not accepted by standard curbside recycling programs; though their composition is often identical to other accepted plastics, they pose problems for the single-stream recycling process, as most of the sorting equipment is designed for rigid plastics such as bottles,[28] so plastic bags often end up clogging wheels or belts, or being confused as paper and contaminating the pulp produced later in the stream.[29] Plastic bags are 100% recyclable. They need to be taken to a location that recycles plastic film, usually a grocery store or major retail chain.[30]

Some large store chains have banned plastic shopping bags such as Whole Foods in the U.S.[31] and IKEA in the U.S. and the U.K.[32]

Heavy-duty plastic shopping bags are suitable for reuse as reusable shopping bags. Lighter weight bags are often reused as trash bags or to pick up pet feces. All types of plastic shopping bag can be recycled into new bags where effective collection schemes exist.

By the mid-1900s, the expansion of recycling infrastructure in the United States yielded a 7% annual rate of plastic bag recycling. This corresponded to more than 800,000,000 pounds (360,000 tonnes) of bags and plastic film being recycled in 2007 alone.[33] Each ton of recycled plastic bags saves the energy equivalent of 11 barrels of oil, although most bags are produced from natural-gas-derived stock.[34] In light of a 2002 Australian study showing that more than 60% of bags are reused as bin liners and for other purposes,[35] the 7% recycling rate accounts for 17.5% of the plastic bags available for recycling.

According to the UK's Environment Agency, 76% of British carrier bags are reused.[36] A survey by the American Plastics Counsel found that 90% of Americans answer yes to the question "Do you or does anyone in your household ever reuse plastic shopping bags?"[37] UK Environment Agency published a review of supermarket carrier bags and compares energy usage of current styles of bag.[38]

Bag legislation
Main article: Phase-out of lightweight plastic bags

As of August 2018, over 160 countries, regions, and cities had enacted legislation to ban or put a fee on plastic bags with the aim to reduce the overall use of disposable plastic bags.[39] Outright bans have been introduced in some countries,[5] notably China which banned very thin plastic bags nationwide in 2008.[2] Several other countries impose a tax at the point of sale.[39]

gollark: @‫everyone EMERGENCY ALERT
gollark: ++delete <@319753218592866315> (*Somehow* ignoring selfmute)
gollark: You are MUTED, lyricly.
gollark: Strings are easy, just do byte arrays with enforced UTF-8.
gollark: > <@!258639553357676545> you have a language that is unobjectively perfect?<@!309787486278909952> Nope. But I don't think you can judge them very objectively at all.

See also
  • Photodegradation, the process through which chemicals decompose when exposed to light

References
  1. European Plastics News: Plastic Brief Carrier Bag (1965) Archived 2010-02-11 at the Wayback Machine. 26 September 2008. Retrieved 17 April 2012.
  2. "China Says Its Plastic Bag Ban Has Saved 4.8 Million Tonnes Of Oil". Business Insider. 21 June 2012. Retrieved 15 October 2012.
  3. Scott Sincoff (1 July 2012). "Los Angeles City Council OKs Plastic Bag Ban". ENN. Retrieved 2 July 2012.
  4. "A short history of plastic bag laws in California". Plastic Bag Laws Organisation. Retrieved 3 July 2012.
  5. "Mauritania bans plastic bag use". BBC. 2 January 2013. Retrieved 4 January 2013.
  6. "Custom reusable shopping bags Wholesale, Reusable Plastic Bags". Plastic Bag Source.
  7. "Plastic bags were created to save the planet, inventor's son says". independent.co.uk. The Independent. 2019-10-17. Retrieved 2020-01-22.
  8. "Plastic pollution: how plastic bags could help save the planet". bbc.com. BBC. 2019-10-17. Retrieved 2020-01-22.
  9. "It's Not My Sag, Baby!" Natural Resource Defense Council. 2003. Retrieved 22 January 2013.
  10. "Climate smart waste sacks and bags made from recycled post consumer polyethylene". Miljösäck. Retrieved 28 November 2012.
  11. Beasley, M. Wayne; Fletcher, Wade D.; Jr, Harry B. Wilfong (Aug 9, 1994), Self-opening polyethylene bag stack and process for producing same, retrieved 2016-09-10
  12. Joan Lowy (20 July 2004). "Plastic left holding the bag as environmental plague". Seattle Post-Intelligencer. Retrieved 1 December 2010.
  13. U.S. International Trade Commission (May 2009). "Polyethylene Retail Carrier Bags from Indonesia, Taiwan, and Vietnam" (PDF). p. IV-7. Retrieved 9 October 2012.
  14. "US Life Cycle Inventory Database". US Department of Energy National Renewable Energy Laboratory. Retrieved 14 February 2015.
  15. "Notes from the Packaging Laboratory: Polylactic Acid – An Exciting New Packaging Material" (PDF). University of Florida. Retrieved 14 February 2015.
  16. "Biodegradable plastic bags carry more ecological harm than good". The Guardian. 18 June 2009. Retrieved 7 June 2012.
  17. John Roach (2003). "Are Plastic Grocery Bags Sacking the Environment?". National Geographic News. Retrieved 2016-05-23.
  18. Donnelly, Tim (2018-01-21). "How New York dropped the ball on plastic bags". The Outline (website)/The Outline. Retrieved 2018-01-23.
  19. "Planet Earth's new nemesis?". BBC News. 8 May 2002. Retrieved 26 November 2010.
  20. "Plastic bags & Metro Floods". Manila Bulletin Publishing Corporation. 4 February 2011. Retrieved 5 September 2011.
  21. "The Manila Floods: Why Wasn't the City Prepared?". ICIMOD. 29 September 2009. Retrieved 5 September 2011.
  22. Brett Israel (2010). "Plastic bag found floating near Titanic shipwreck". Today. Archived from the original on 14 September 2010. Retrieved 1 December 2010.
  23. "Life Cycle Assessment of grocery carrier bags" (PDF). Denmark Environmental Protection Agency. February 2018.
  24. I.A. Hinojosa and M. Thiel (2009). "Floating marine debris in fjords, gulfs, and channels of southern Chile". Mar Pollut Bull. 58 (3): 341–50. doi:10.1016/j.marpolbul.2008.10.020. PMID 19124136.
  25. "Environmental and Economic Highlights of the Results of the Life Cycle Assessment of Shopping Bags" (PDF). Recyc-Quebec. December 2017.
  26. "Life cycle assessment of supermarket carrier bags: a review of the bags available in 2006" (PDF). United Kingdom Environment Agency.
  27. "Life Cycle Assessment of Grocery Bags inCommon Use in the United States". Clemson University. 2014.
  28. "Can I Recycle Plastic Bags in the Recycling Bin?". Plastics Make It Possible. Retrieved 2016-03-13.
  29. WCMS, Webboy.net. "Why Are Plastic Bags So Bad For Your Recycling Bin?". National Recycling Week. Retrieved 2016-03-13.
  30. "Plastic Film Recycling".
  31. Martin, Andrew (2008-01-23). "Whole Foods Chain to Stop Use of Plastic Bags". The New York Times. Retrieved 28 September 2012.
  32. "IKEA to Phase Out Plastic Bags in U.S." GreenBiz. 2 April 2008. Retrieved 3 July 2012.
  33. "2007 National Post-Consumer Recycled Plastic Bag & Film Report". americanchemistry.com. Archived from the original on 2009-04-13.
  34. "EPA NE: Questions About Your Community – Shopping Bags: Paper or Plastic or . . . ?". epa.gov. Archived from the original on 26 April 2006.
  35. Plastic shopping bags in Australia. Environment.gov.au (2010-06-13). Retrieved on 2010-11-23.
  36. Environment Agency (2011). "Evidence: Life Cycle Assessment of Supermarket Carrier Bags" (PDF). Environment Agency. Archived from the original (PDF) on 13 March 2011. Retrieved 7 April 2011.
  37. Irena Choi Stern (5 August 2007). "Greening Up by Cutting Down on Plastic Bags". The New York Times. Retrieved 8 April 2011.
  38. "Archived copy" (PDF). Archived from the original (PDF) on 2013-02-12. Retrieved 2013-03-24.CS1 maint: archived copy as title (link)
  39. Nielsen, Tobias Dan; Holmberg, Karl; Stripple, Johannes (2019-03-15). "Need a bag? A review of public policies on plastic carrier bags – Where, how and to what effect?". Waste Management. 87: 428–440. doi:10.1016/j.wasman.2019.02.025. ISSN 0956-053X.

Further reading
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