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ZIPPER PET CASE
Polyethylene terephthalate , commonly abbreviated PET is the most
common thermoplastic polymer resin of the polyester family and is usedin fibers for clothing, containers for liquids and foods, thermoforming for
manufacturing, and in combination with glass fiber for engineering resins .
PET consists of polymerized units of the monomer ethylene terephthalate , with
repeating (C ! " #$ %& units. PET is commonly recycled, and has the number 1 as
its recycling symbol .
Physical properties
PET in its natural state is a colorless, semi'crystalline resin. ased on how it is
processed, PET can be semi'rigid to rigid, and it is very lightweight. )t ma*es a
good gas and fair moisture barrier, as well as a good barrier to alcohol (requires
additional +barrier+ treatment& and solvents. )t is strong and impact'resistant . PET
becomes white when e posed to chloroform and also certain other chemicals such
as toluene.
Biodegradation
-hen a plastic ob ect is abandoned in nature, ultraviolet sunlight provides the
energy of activation required to start the incorporation of o ygen in their
molecules . This process causes the ob ect to become brittle and fragmented into
small pieces increasingly until the polymer chains reach a sufficiently low molecular
weight so that they can be metabolized by microorganisms.
"owever, PET is a particularly durable material to biodegradation due to their high
crystallinity and the aromatic nature of their molecules, which is considered not
biodegradable.
https://en.wikipedia.org/wiki/Thermoplastichttps://en.wikipedia.org/wiki/Polymerhttps://en.wikipedia.org/wiki/Polyesterhttps://en.wikipedia.org/wiki/Synthetic_fiberhttps://en.wikipedia.org/wiki/Packaginghttps://en.wikipedia.org/wiki/Thermoforminghttps://en.wikipedia.org/wiki/Resinshttps://en.wikipedia.org/wiki/Polymerhttps://en.wikipedia.org/w/index.php?title=Ethylene_terephthalate&action=edit&redlink=1https://en.wikipedia.org/wiki/Resin_identification_codehttps://en.wikipedia.org/wiki/Toughnesshttps://en.wikipedia.org/wiki/Polymerhttps://en.wikipedia.org/wiki/Polyesterhttps://en.wikipedia.org/wiki/Synthetic_fiberhttps://en.wikipedia.org/wiki/Packaginghttps://en.wikipedia.org/wiki/Thermoforminghttps://en.wikipedia.org/wiki/Resinshttps://en.wikipedia.org/wiki/Polymerhttps://en.wikipedia.org/w/index.php?title=Ethylene_terephthalate&action=edit&redlink=1https://en.wikipedia.org/wiki/Resin_identification_codehttps://en.wikipedia.org/wiki/Toughnesshttps://en.wikipedia.org/wiki/Thermoplastic
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Plastic bottles of sodas and water ta*e between !! and !!! years to
decompose. /ost of these bottles are made of polyethylene terephthalate called a
plastic (PET& , which is a very resistant material to degrade in the environment.
"owever, one study has found that microbes 0ocardia species are capable of
carrying out a +slow and wea*+ PET, with its ability to synthesize certain esterase
biodegradation.
PET recycling
There are different alternatives which can be recycled PET from the mechanical,
chemical and some that have been raised in other countries for reuse PET or find
useful PET containers, in order to reduce its environmental impact and the volume
recycled of these in garbage dumps.
1 Mechanical recycling 2 This type of system is the most conventional recycling for
PET. )t consists of a series of steps to which the material is sub ected to cleaning
and processing, without involving a chemical change in its structure. -henconsidering this type of recycled PET it is important to *now the origin of the
residue (residue of industrial process or post'consumer waste& also is important to
consider the application which will be used (fiber, sheet, cylinder, drum, band ...&
and whether this will have any contact with food. The quality of the resulting
product will be completely lin*ed to the previous separation of plastic materials,
impurities and course of cleaning. Thus, it is important to perform minutely
selection process and thread (separation, cold wash, hot wash, drying, etc.& for each case.
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Negative effects on the environment
The main environmental problem of PET is discarded, because once it becomes
waste, it is *nown his presence in the channels of surface currents and drainage
causing bloc*age and difficulties in the process of desilting , easing flooding. 3nd in
the streets, forests, ungles and the ocean, generating + un*+ .
3lthough the physical and chemical characteristics ensure that this material is inert
in the environment, the visual impact that inadequate provision is high andperceptible to the population.
PR !ECT "ESCRIPTI N
PET plastic is a material that is causing serious environmental damage. 4ue to
mass production and the difficulties in disposal5 rivers, la*es and oceans are
contaminated by this material. 6arge tracts of land are not enough to contain the
vast amount of non' degradable material.
7aced with this big problem facing society and that is affecting ecosystems
immediate solutions are sought. The most important are the reduction, recycling
and reuse Pet. 3s engineering students you want to implement recycling of PET
plastic bottles for later use in the creation of cases made by hand, which can be
used for many purposes. The following materials , procedure, and costs for the
preparation of these cases is described in detail 5 and the different uses that can
give you. To assist with the reduction of this material as a contaminant for
ecosystems.
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MATERIA#
-e need2
• PET bottles of soda or water.• scissors• Cold silicone• Colored zippers
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