Effect of consecutive extrusion cycles on simulated recycled polyethylene terephthalate (r-PET)

Name: Gustina, Rizka Try

LCSH: Kasetsart University -- Theses. M.S. (Packaging Technology) 2021

Classification :.LCCS: TP1180.T5

LCSH: Kasetsart University. -- Department of Packaging and Materials Technology -- Theses

LCSH: Polyethylene terephthalate

LCSH: Thermoplastics

LCSH: Plastics -- Extrusion

LCSH: Extrusion process

Abstract: The objective of the present thesis is to investigate the effect on the physical and mechanical properties and determine the overall migration of substances from the consecutive extrusion process of polyethylene terephthalate. The virgin polyethylene terephthalate (v-PET) was processed by the consecutive recycling process. The samples were prepared by melting PET pellets using a twin-screw extruder with a processing temperature range of 120-280℃ and a screw speed of 130 rpm. The melting process of PET pellets was carried out from 1 to 6 cycles to simulate recycled PET (r-PET) production. The morphology and thermal properties were investigated on the r-PET pellet while the tensile properties, barrier properties, and overall migration were investigated on r-PET sheet. The results showed significant changes in both of physical and mechanical properties of r-PET with the increasing number of consecutive extrusion process. The reduction of r-PET quality could be explained by chain scission due to hydrolysis, thermal, and oxidation degradation. The chain scission produces shorter chains which result in more ends per unit volume and hence a higher free volume. The result has shown that increasing the number of consecutive recycling processes reduced the processability of PET. The overall migration result of r-PET from R0 to R6 was less than 10 mg/dm² which complied with the overall migration limit set by the Commission Regulation (EU) 10/2011.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Busarin Chongcharoenyanon

Role: Thesis Advisor

Name: Amporn Sane

Role: Thesis CO-Advisor

Name: Piyawanee Jariyasakoolroj

Role: Thesis CO-Advisor

Created: 2021

Modified: 2568-07-19

Issued: 2025-07-18

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2564/rizka-try-all.pdf

CallNumber: TP1180.T5 .G87

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Packaging Technology

Grantor: Kasetsart University

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