8
P. Senthil Kumar and G. Janet Joshiba
Fig. 4 Conversion of PET to
fibre
6.1 Re-Utilization
The reuse is seemed to be the primary and less effective method of recycling the
polyesters. The waste polyesters are separated and segregated according to their capability to reuse. The main drawback behind the reutilization chamber is the ingestion
of contaminants in the containers.
6.2 Mechanical and Thermal Reprocessing
It is also known as the secondary reprocessing of polyesters. In the mechanical and
thermal reprocessing, the polymer materials are subjected to a series of conversion
process such as collection, purification, grinding, shredding, melting, molding, spinning, pelletization. In this methods, the virgin polyesters are recreated into other
recycled polyesters.
6.3 Chemical Reprocessing
In this method, the virgin polymers are reprocessed chemically and converted into
monomers. This process includes a series of conversion steps such as collection,
segregation, and degradation. The partial processing is considered to be the economical method, whereas when the polymers are chemically reprocessed completely it
becomes quite expensive and requires high-cost raw materials. Chemical recycling
is the conversion of multiple branched polymers to monomers through chemical
reactions. This type of recycling alters the chemical structure of the polymers and it
decomposes the polymers into monomers through various chemical reactions such
as Glycolysis, Pyrolysis, Cracking, Hydrolysis, Methanolysis, Photodegradation and
Thermal cracking [4, 13, 14].
P. Senthil Kumar and G. Janet Joshiba
Fig. 4 Conversion of PET to
fibre
6.1 Re-Utilization
The reuse is seemed to be the primary and less effective method of recycling the
polyesters. The waste polyesters are separated and segregated according to their capability to reuse. The main drawback behind the reutilization chamber is the ingestion
of contaminants in the containers.
6.2 Mechanical and Thermal Reprocessing
It is also known as the secondary reprocessing of polyesters. In the mechanical and
thermal reprocessing, the polymer materials are subjected to a series of conversion
process such as collection, purification, grinding, shredding, melting, molding, spinning, pelletization. In this methods, the virgin polyesters are recreated into other
recycled polyesters.
6.3 Chemical Reprocessing
In this method, the virgin polymers are reprocessed chemically and converted into
monomers. This process includes a series of conversion steps such as collection,
segregation, and degradation. The partial processing is considered to be the economical method, whereas when the polymers are chemically reprocessed completely it
becomes quite expensive and requires high-cost raw materials. Chemical recycling
is the conversion of multiple branched polymers to monomers through chemical
reactions. This type of recycling alters the chemical structure of the polymers and it
decomposes the polymers into monomers through various chemical reactions such
as Glycolysis, Pyrolysis, Cracking, Hydrolysis, Methanolysis, Photodegradation and
Thermal cracking [4, 13, 14].