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.
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 Plastics Recycling Machine.
Plastic Recycling Sorting Process and Equipment
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.
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
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.
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.
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
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.
Size Reduction Machines
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.
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.
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.
There are a variety of other Recycling Machine used more and more in
the modern industry such as Copper Wire Recycling Machine,
Rotor Recycling Machine and
Recycling Machine. Without doubt, they must require the
cooperation with many Other Accessories like
and Cable Shredder
- Created: 06-01-22
- Last Login: 06-01-22