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Plastic recyclingFrom Wikipedia, the free encyclopedia
Plastic recyclingis the process of recovering scrap or waste plasticand reprocessing the
material into useful products, sometimes completely different in form from their original state. For
instance, this could mean melting down soft drinkbottles and then casting them as plastic chairs
and tables. Plastic 'recycling' is largely a misnomer since plastic beverage bottles (soda, juice,
milk) are never reformed into new beverage bottles; this requires virgin plastic. There simply is nocycle involved with the "recycling" of plastic beverage containers.
Plastics are also recycled during the manufacturing process of plastic goods such as polyethylene
film and bags. A percentage of the recycled pellets are then re-introduced into the main production
operation. This closed-loop operation has taken place since the 1970s and has made the
production of some plastic products amongst the most efficient operations today.
Contents [hide]
1 Challenges
2 Processes
2.1 Thermal depolymerization
2.2Heat compression
2.3Other processes
3 A licat ions
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material, meaning that polymer blendsare useful in only limited applications.
Another barrier to recycling is the widespread use of dyes, fillers, and other additives in plastics.
The polymer is generally too viscousto economically remove fillers, and would be damaged by
many of the processes that could cheaply remove the added dyes. Additives are less widely used
in beverage containers and plastic bags, allowing them to be recycled more often. Yet another
barrier to removing large quantities of plastic from the waste stream and landfills is the fact thatmany common but small plastic items lack the universal triangle recycling symbol and
accompanying number. An example is the billions of plastic utensils commonly distributed at fast
food restaurants or sold for use at picnics.[citation needed]
The use of biodegradable plasticsis increasing.[1]
Processes[edit]
Before recycling, most plastics are sorted according to their resin type. In the past, plastic
reclaimers used the resin identification code(RIC), a method of categorization of polymer types,
which was developed by the Society of the Plastics Industryin 1988. Polyethylene terephthalate,
commonly referred to as PET, for instance, has a resin code of 1. Most plastic reclaimers do not
rely on the RIC now; they use automatic sort systems to identify the resin, such as near infrared
(NIR) technology. Some plastic products are also separated by color before they are recycled. The
plastic recyclables are then shredded. These shredded fragments then undergo processes to
eliminate impurities like paper labels. This material is melted and often extrudedinto the form of
pellets which are then used to manufacture other products.
Thermal depolymerization [edit]
Main article: Depolymerization
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Main article: Thermal depolymerization
Another process involves the conversion of assorted polymers into petroleumby a much less
precise thermal depolymerizationprocess. Such a process would be able to accept almost any
polymer or mix of polymers, including thermosetmaterials such as vulcanized rubbertire
superation of wastes and the biopolymers in feathersand other agricultural waste. Like natural
petroleum, the chemicals produced can be made into fuels as well as polymers. A pilot plant of this
type exists in Carthage, Missouri, United States, using turkey waste as input material. Gasification
is a similar process, but is not technically recycling, since polymers are not likely to become the
result.
Heat compression [edit]
Yet another process that is gaining ground with startup companies (especially in Australia, United
Statesand Japan) is heat compression.[citation needed]The heat compression process takes allunsorted, cleaned plastic in all forms, from soft plastic bags to hard industrial waste, and mixes the
load in tumblers (large rotating drums resembling giant clothes dryers). The most obvious benefit
to this method is the fact that all plastic is recyclable, not just matching forms. However, criticism
rises from the energy costs of rotating the drums, and heating the post-melt pipes.
Other processes [edit]
A process has also been developed in which many kinds of plastic can be used as a carbon
source in the recycling of scrap steel.[2]
Applications [edit]
PET [edit]
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Bales of PET bottles to be recycled.
Main article: PET bottle recycling
Post-consumer polyethylene terephthalate (PET or
PETE) containers are sorted into different colour
fractions, and baled for onward sale. PET recyclers
further sort the baled bottles and they are washed
and flaked (or flaked and then washed). Non-PET
fractions such as caps and labels are removed during
this process. The clean flake is dried. Further
treatment can take place e.g. melt filtering and
pelletising or various treatments to produce food-
contact-approved recycled PET (RPET).
RPET has been widely used to produce polyester
fibres.[3]This sorted post-consumer PET waste is crushed, chopped into flakes, pressed intobales, and offered for sale.[4]
One use for this recycled PET that has recently started to become popular is to create fabrics to
be used in the clothing industry.[5]The fabrics are created by spinning the PET flakes into thread
and yarn.[4]This is done just as easily as creating polyester from brand new PET.[6]The recycled
PET thread or yarn can be used either alone or together with other fibers to create a very wide
variety of fabrics. Traditionally these fabrics are used to create strong, durable, rough, products,such as jackets, coat, shoes, bags, hats, and accessories since they are usually too rough for
direct skin contact and can cause irritation.[7]However, these types of fabrics have become more
popular as a result of the public's growing awareness of environmental issues. Numerous fabric
and clothing manufacturers have capitalized on this trend.
Other major outlets for RPET are new containers (food-contact or non-food-contact) produced
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PVC SPI
code, for
recycling (Society
of the Plastics
Industry). The
Unicode
character for this
symbol is
U+2675.
either by (injection stretch blow) moulding into bottles and jars or by thermoforming APET sheet to
produce clam shells, blister packs and collation trays. These applications used 46% of all RPET
produced in Europe in 2010.[citation needed]Other applications, such as strapping tape, injection-
moulded engineering components and even building materials account for 13% of the 2010 RPET
production.[citation needed]
PVC [edit]
Collection and recycling schemes for the PVC waste stream are managed
through Recovinyl[8]in Europe which reported the recycled tonnage as
follows: profile 107,000 tonnes; flexible cables 79,000 tonnes; pipe 25,000
tonnes; rigid film 6,000 tonnes; and mixed flexible 38,000 tonnes. Recovinyl
states that of the recycled material, 75% is for floors, 15% for foils, 5% for
traffic cones, 3% for hoses and 2% for other applications.
One of the recycling processes is the VinyloopTexyloop[9]used for solvent-
based mechanical recycling. It involves recovering PVC plastic from composite
materials through dissolution and precipitation, and is a closed-loop system,
recycling the solvent and regenerating PVC. It offers a major ecological
benefit, as Vinyloop-based recycled PVC's primary energy demand is 46%
lower than conventional produced PVC. The global warming potential of
recycled PVC is 39% lower, a significant reduction in the ecological footprint.[10]
HDPE [edit]
The most recycled plastic, HDPE(high-density polyethylene) or number 2, is downcycledinto
plastic lumber, tables, roadside curbs, benches, truck cargo liners, trash receptacles, stationery
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been either landfilled or burned on-site in the fields of individual farms.[16]
CNNreports that Dr. S. Madhu of the KeralaHighway Research Institute, India, has formulated a
road surface that includes recycled plastic: aggregate, bitumen(asphalt) with plastic that has been
shredded and melted at a temperature below 220 degrees C (428 F) to avoid pollution. This road
surface is claimed to be very durable and monsoon rain resistant. The plastic is sorted by hand,
which is economical in India. The test road used 60 kg of plastic for an approximately 500m-long,8m-wide, two-lane road. The process chops thin-film road-waste into a light fluff of tiny flakes that
hot-mix plants can uniformly introduce into viscous bitumen with a customized dosing machine.
Tests at both Bangalore and the Indian Road Research Centre indicate that roads built using this
'KK process' will have longer useful lives and better resistance to cold, heat, cracking, and rutting,
by a factor of three.[17]
Recycling rates [edit]
The quantity of post-consumer plastics recycled has increased every year since at least 1990, but
rates lag far behind those of other items, such as newspaper (about 80%) and corrugated
fiberboard(about 70%).[18]Overall, U.S. post-consumer plastic waste for 2008 was estimated at
33.6 million tons; 2.2 million tons (6.5%) were recycled and 2.6 million tons (7.7%) were burned for
energy; 28.9 million tons, or 85.5%, were discarded in landfills.[19]
Economic and energy potential [edit]
In 2008, the price of PET dropped from $370/ton in the US to $20 in November. [20]PET prices had
returned to their long term averages by May 2009.[21]There has been an increase in the use of
plastics over the past few decades. This increase in use has dried up various exhaustible
resources and caused a threat to the environment. Plastic is a unique material to be used in a
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broad range of products again and again. Plastics use oil and energy during its manufacturing.
Nearly 4% of oil in the world is used to manufacture plastic. Though this amount is not very large,
recycling plastic will save this extinguishable energy source.[22]
Consumer education [edit]
United States [edit]
Low national plastic recycling rates have been due to the complexity of sorting and processing,
unfavorable economics, and consumer confusion about which plastics can actually be recycled.[23]
Part of the confusion has been due to the use of the resin identification codewhich is not on all
plastic parts but just a subset [24]that includes the recycling symbolas part of its design. The resin
identification codeis stamped or printed on the bottom of containers and surrounded by a triangle
of arrows. (See the table in Plastic.) The intent of these symbols was to make it easier to identifythe type of plastics used to make a particular container and to indicate that the plastic is potentially
recyclable. The question that remains is which types of plastics can be recycled by your local
recycling center. In many communities, not all types of plastics are accepted for sidewalk recycling
collection programs due to the high processing costs and complexity of the equipment required to
recycle certain materials. There is also sometimes a seemingly low demand for the recycled
product depending on a recycling center's proximity to entities seeking recycled materials. Another
major barrier is that the cost to recycle certain materials and the corresponding market price forthose materials sometimes does not present any opportunity for profit. The best example of this is
regarding polystyrene (commonly called styrofoam), although some communities, like Brookline,
MA, are moving toward banning the distribution of polystyrene containers by local food and coffee
businesses.[25][26]
United Kingdom [edit]
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In the UK, the amount of post-consumer plastic being recycled is relatively low,[27]due in part to a
lack of recycling facilities.
The Plastics 2020 Challengewas founded in 2009 by the plastics industry with the aim of engaging
the British public in a nationwide debate about the use, reuse and disposal of plastics, and hosts a
series of online debates on its website framed around the waste hierarchy.
There is a facility in Worksopcapable of recycling 60 - 80 thousand metric tonnes a year.[28]
In N.Ireland, the rate of recycling is relatively low at only 37.4%. However, emerging technologies
are helping to increase the recycling rates of items previously landfilled e.g. mixed hard plastics.[29]
Plastic identification code [edit]
Main article: Resin identification code
Five groups of plastic polymers,[30]each with specific properties, are used worldwide for packaging
applications (see table below). Each group of plastic polymer can be identified by its Plastic
Identification code (PIC), usually a number or a letter abbreviation. For instance, Low-Density
Polyethylene can be identified by the number "4" or the letters "LDPE". The PIC appears inside a
three-chasing-arrow recycling symbol. The symbol is used to indicate whether the plastic can be
recycled into new products.[citation needed]
The PIC was introduced by the Society of the Plastics Industry, Inc., to provide a uniform system
for the identification of various polymer types and to help recycling companies separate various
plastics for reprocessing. Manufacturers of plastic products are required to use PIC labels in some
countries/regions and can voluntarily mark their products with the PIC where there are no
requirements.[31]Consumers can identify the plastic types based on the codes usually found at
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the base or at the side of the plastic products, including food/chemical packaging and containers.
The PIC is usually not present on packaging films, since it is not practical to collect and recycle
most of this type of waste.[clarification needed][citation needed]
Plastic
IdentificationCode
Type of
plasticpolymer
Properties
Common
PackagingApplications
Glass
Transition
and MeltingTemperatures
(C)
Young's
Modulus(GPa)
Polyethylene
terephthalate
(PET, PETE)
Clarity,
strength,
toughness,
barrier to
gas and
moisture.
Soft drink, water and
salad dressing
bottles; peanut
butter and jam jars;
small customer
electronics.
Tm = 250;[32]
Tg = 76[32]2-2.7[33]
High-density
polyethylene
(HDPE)
Stiffness,
strength,
toughness,
resistance
to moisture,
permeability
to gas.
Water pipes, hula
hooprings, five
gallon buckets, milk,
juice and water
bottles; grocerybags, some
shampoo/toiletry
bottles.
Tm = 130;[34]
Tg = -125[35]0.8[33]
Blister packaging for
non-food items;
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Polyvinyl
chloride
(PVC)
Versatility,
ease of
blending,
strength,
toughness.
cling films for non-
food use. May be
used for food
packaging with the
addition of the
plasticisers needed
to make nativelyrigid PVC flexible .
Non-packaging uses
are electrical cable
insulation; rigid
piping; vinyl records.
Tm = 240;[36]
Tg = 85[36]2.4-4.1[37]
Low-density
polyethylene
(LDPE)
Ease of
processing,
strength,
toughness,
flexibility,
ease of
sealing,
barrier tomoisture.
Frozen food bags;
squeezable bottles,
e.g. honey, mustard;
cling films; flexible
container lids.
Tm = 120;[38]
Tg = -125[39]0.17-0.28[37]
Strength,
toughness,
resistance
to heat,
Reusable
microwaveable
ware; kitchenware;
yogurt containers;
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Polypropylene
(PP)
chemicals,
grease and
oil,
versatile,
barrier to
moisture.
margarine tubs;
microwaveable
disposable take-
away containers;
disposable cups;
plates.
Tm = 173;
Tg = -10[40]1.5-2[33]
Polystyrene
(PS)
Versatility,
clarity,
easily
formed
Egg cartons;
packing peanuts;
disposable cups,
plates, trays and
cutlery; disposable
take-away
containers.
Tm = 240 (only
isotactic);[35]
Tg = 100
(atactic and
isotactic)[35]
3-3.5[33]
Other (oftenpolycarbonate
or ABS)
Dependent
on polymersor
combination
of polymers
Beverage bottles;
baby milk bottles.
Non-packaging uses
for polycarbonate:
compact discs;
"unbreakable"
glazing; electronicapparatus housings;
lenses including
sunglasses,
prescription glasses,
automotive
Polycarbonate:Tg = 145;[42]
Tm = 225[43]
Polycarbonate:2.6;[33]ABS
plastics: 2.3[33]
h dl i
http://en.wikipedia.org/wiki/File:Plastic-recyc-05.svghttp://pdfcrowd.com/http://pdfcrowd.com/redirect/?url=http%3a%2f%2fen.wikipedia.org%2fwiki%2fPlastic_recycling&id=ma-140801174934-059437b9http://pdfcrowd.com/customize/http://pdfcrowd.com/html-to-pdf-api/?ref=pdfhttp://en.wikipedia.org/wiki/File:Plastic-recyc-05.svghttp://en.wikipedia.org/wiki/Polypropylenehttp://en.wikipedia.org/wiki/File:Plastic-recyc-06.svghttp://en.wikipedia.org/wiki/Polystyrenehttp://en.wikipedia.org/wiki/File:Plastic-recyc-07.svghttp://en.wikipedia.org/wiki/Polycarbonatehttp://en.wikipedia.org/wiki/Acrylonitrile_butadiene_styrene8/10/2019 Wikipedia Plastic Recycling
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Sustainable development portal
Ecology portal
Environment portal
headlamps, riot
shields, instrument
panels.[41]
See also [edit]
BalerBisphenol_A#Identification_in_plastics, an article on
"BPA", esp. relevant to types 3 & 7 plastics.
Microplastics
Phase-out of lightweight plastic bags
Plastics 2020 Challenge
Post-consumer resin sterilization
Reuse of water bottles
References [edit]
1. ^Hatti-Kaul, Rajni. "Industrial biotechnology for the production of bio-based chemicals a cradle-to-
grave perspective" . Trends in Biotechnology. Lund University. Retrieved 26 August 2012.
2. ^Steel CNN. Retrieved 9.11.06.
3. ^"EcoSpun (Eco-fi) Clothing - Eartheasy.com Solutions for Sustainable Living" . Eartheasy.com.Retrieved 2010-08-21.
4. ^ abIdea TV GmbH. "Recycled plastic - the fashion fabric of the future" . Innovations-report.com.
Retrieved 2010-08-21.
5. ^10:24 AM PT, November 13, 2009 (2009-11-13). "Trashy Chic: Recycled clothing from Playback -
Brand X" . Thisisbrandx.com. Retrieved 2010-08-21.
6 ^ "R ' REWOVEN T h l I f Th E N i R l d PET" R
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6. ^"Reware's REWOVEN Technology Info: The Eco Narrative - Recycled PET" . Rewarestore.com.
Retrieved 2010-08-21.
7. ^"Billabong ECO Supreme Suede Boardshorts: Sustainable is Good Eco Products" .
Sustainableisgood.com. 2008-04-09. Retrieved 2010-08-21.
8. ^Incentives to collect and recycle . Recovinyl. Retrieved on 2011-10-06.
9. ^Texyloop : recyclage de textiles PVC . Texyloop.com. Retrieved on 2011-10-06.
10. ^Vinyloop White Paper . Retrieved on 2014-01-11.11. ^Polystyrene recycling. Polystyrene packaging council. Retrieved on 2009-03-06.
12. ^"Let Peanuts Live! Mail Boxes Etc. Recycles as Part of National Effort; Recycle Loose-fill, Foam
'Peanuts' At Participating Mail Boxes Etc. Locations" . AllBusiness.com. Retrieved 2010-08-21.
13. ^Plastic trial procedure Oaktech Environmental website. Retrieved 9.11.06.
14. ^Agricultural plastics recycling process Agricultural plastics recycling website. Retrieved
07.11.08.
15. ^Plastic Composite Railroad Tie Facts Plastic Composite Railroad Ties website. Retrieved
01.21.08.
16. ^Recycling Used Agricultural Plastics James W. Garthe, Paula D. Kowal, PennState University,
Agricultural and Biological Engineering
17. ^Patel, Almitra H. (October 2003), Plastics Recycling and The Need For Bio-Polymers 9(4),
EnviroNews Archives
18. ^The Self-Sufficiency Handbook: A Complete Guide to Greener Living by Alan Bridgewater pg. 62--
Skyhorse Publishing Inc., 2007 ISBN 1-60239-163-7, ISBN 978-1-60239-163-5
19. ^" "Energy and Economic Value of Non-recycled Plastics and Municipal Solid Wastes" at
Journalist's Resource.org" .
20. ^Page, Candace, Waste district raises recycling fees, Burlington Free Press, November 12, 2008
21. ^Financial Times, May 15, 2009 (article by Max Hogg)
22. ^http://www.almumayezplastic.com/aboutus
23 ^ W t T (J 2 2007) "Wh t ll th l ti ?" S ttl Ti R t i d
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23. ^Watson, Tom (June 2, 2007). "Where can we put all those plastics?" . Seattle Times. Retrieved
2007-06-02.
24. ^SPI Resin Identification Code - Guide to Correct Use,
http://www.plasticsindustry.org/AboutPlastics/content.cfm?ItemNumber=823
25. ^Where can we put all those plastics? By Tom Watson June 2, 2007 Seattle Times
http://seattletimes.nwsource.com/html/homegarden/2003730398_ecoconsumer02.html
26. ^Brookline Town Meeting bans Styrofoam coffee, takeout containers by Brock Parker Nov 13, 2012Boston.com
http://www.boston.com/yourtown/news/brookline/2012/11/brookline_town_meeting_bans_st.html
27. ^Plastics wasteonline.org.uk. Retrieved 10.18.07.
28. ^http://www.mbapolymers.com/home/mba-polymers-uk-ltd
29. ^http://www.envirogreenrecycling.com/plastic-recycling
30. ^"Safe Use Of Plastic Food Packaging And Containers" .
31. ^"19". Holt Chemistry (Floridaedition). Holt, Rinehart, and Winston. 2006. p. 702. ISBN0-03-
039114-8. "More than hlf the states in the United States have enacted laws that require plastic
products to be labeled with numerical codes that identify the type of plastic used in them."
32. ^ ab[1] PolymerProcessing.com
33. ^ abcdef[2] The Engineering Toolbox
34. ^[3] Dyna Lab Corp
35. ^ abc[4] Sigma Aldrich
36. ^ ab[5] PolymerProcessing.com
37. ^ abModern Plastics Encyclopedia 1999, p B158 to B216.(Tensile Modulus)
38. ^[6] Dyna Lab Corp
39. ^[7] Wofford University
40. ^ ab[8] PolymerProcessing.com
41. ^"What is Polycarbonate (PC)?" .
42 ^ "polycarbonate information and properties" Polymerprocessing com 2001 04 15 Retrieved
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42. ^ polycarbonate information and properties . Polymerprocessing.com. 2001-04-15. Retrieved
2012-10-27.
43. ^[9] PolymerProcessing.com
European Commission's funded FP7 project PRIME on mixed plastics recycling
External links [edit]
West, Larry. "Recyclable Plastic: Why are So Few Food
Containers Made of Recyclable Plastic?" . About.com.
Retrieved 2009-05-04.
Plastic Packaging Resin Codes data from the American Chemistry Council
ISF's Plastics Recovery Manual
American Chemistry Council Statement on Plastic Recycling
Technology for plastic recycling
Mike Biddle we can recycle plastic
Visit Earth911 to find locations to drop off plastics that are not recycled by your municipality
Recycling
Health issues of plasticsand Polyhalogenated compounds
(PHCs)
Categories: Plastic recycling Recycling by material
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