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Plastic recycling is a well-established industry that globally processes and resells
several million tons of used plastic material each year. Rather than operating merely
out of environmental necessity, plastic material recovery services can be both cost-
efficient and productive, saving resources for a range of different manufacturing
applications. The recycling and reclamation field also encompasses the industrial
processes by which plastic materials are separated into their base monomers and made
available for further polymerization at secondary and tertiary levels.
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While the plastic recycling industry was originally focused on recovering
manufacturing scraps and byproducts left over from initial plastic fabrication,
present-day recycling services are capable of reclaiming heterogeneous post-consumer
goods as well. The methods employed by material recovery systems tend to vary according
to the type of plastic being processed, but there are some essential practices common to
most recycling services. Stages such as sorting, cleaning, size reduction, separation,
and pelletizing can be found in most plastic recycling operations. Likewise, the
machinery used to achieve these processes generally falls into a handful of equipment
categories called <a href="http://www.chinatzqida.com/plastics-recycling-machine/"
target="_self">Plastics Recycling Machine</a>.
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<strong>Plastic Recycling Sorting Process and Equipment</strong><br/>
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Sorting and grouping plastic materials according to resin type is an important first
step in the recycling process because contamination can render a batch of material un-
reusable. The most frequently recycled resins, including polyethylene terephthalate
(PET), high-density polyethylene (HDPE), and polyvinyl chloride (PVC), must be carefully
separated from one another in order to enable further processing. Contaminants within
each type of plastic must also be removed from the base resin to ensure stock purity.
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Sorting machines must rapidly identify and categorize large volumes of post-consumer
plastic, often under continuous input. Although there are varying degrees of technical
sophistication and capacity, an advanced sorting machine can be equipped with some or
all of the following features:
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Sensors: These devices detect specific polymers within a mixed stream of plastic
materials. They can be equipped with x-ray or infrared sensing that registers a
polymer's unique signature along the spectrum. Some sensors also incorporate color
detection technology that sorts material according to tint and transparency.<br/>
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Ejectors: Mechanical or precision air ejection units physically group different
plastic materials according to resin types. Depending on their capacity, ejectors can
often handle very high rates of input.
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Computing Systems: Computer processing technology supplies the algorithms that are
used to identify and sort different materials. These systems provide the controlling
parameters for both sensor and ejector operations.
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User Interfaces: An operator's interface can provide machine controls and
diagnostic tools for technicians. In addition, interfaces can also offer networking
abilities to help integrate a sorting machine and make rapid adjustments to its
functions.
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<strong>Size Reduction Machines</strong>
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Plastic materials usually need to be cut into smaller sizes in order to allow
further processing and to provide easier packaging, transportation, and distribution of
recycled stock. This cutting presents certain challenges, as many plastics are abrasive
to metal blades and can have wide variation in their hardness, weight, and thickness.
Most standard size reduction is performed by single or multi-shaft shredders, and
granulators. Multi-shaft shredders perform scissor-like cutting with a series of
rotating blades that can handle moderately dirty or contaminated material, but are
somewhat imprecise in the size of the cuts. Single shaft shredders perform more of a
tearing motion, and have slower motors that lengthen blade lifespan. They can also
handle dirty or abrasive material and usually have adjustable or replaceable blades.
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Granulators are composed of a rotor attached to blades that rotate within a chamber
containing a grid floor. Their capacity for processing plastic material depends on the
speed of the rotor, angle of the cutting blades, spacing of the grid, and the shape of
the rotor. Granulators are usually sturdy machines, capable of relatively rapid cutting
rates, and the presence of the grid allows for more precise control over the size of
cuts. Granulator blades typically need to be replaced regularly over the course of
operations.
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<strong>Washing Equipment</strong><br/>
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After the plastic has been cut into smaller pieces, or "flakes," the stock
usually needs to be washed in order to remove lingering dirt or attachments. Paper,
glue, sand, and grit are some of the common elements targeted in the washing process,
which can be accomplished using water baths, friction washers, or a washing line. The
washing line applies a continuous hot spray over a stream of plastic material, removing
some or all of the labels and dirt attached to the plastic surface. Detergents and
disinfecting agents are often included in this process to improve the level of cleaning.
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There are a variety of other Recycling Machine used more and more in the modern
industry such as <a href="http://www.chinatzqida.com/copper-wire-recycling-machine/"
target="_self">Copper Wire Recycling Machine</a>, <a
href="http://www.chinatzqida.com/motor-rotor-recycling-machine/" target="_self">Motor
Rotor Recycling Machine</a> and <a href="http://www.chinatzqida.com/radiator-recycling-
machine/" target="_self">Radiator Recycling Machine</a>. Without doubt, they must
require the cooperation with many <a href="http://www.chinatzqida.com/other-
accessories/" target="_self">Other Accessories</a> like <a
href="http://www.chinatzqida.com/cable-stripper/" target="_self">Cable Stripper</a> and
<a href="http://www.chinatzqida.com/cable-shredder/" target="_self">Cable Shredder</a>.
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