Effects of injection-molding processing parameters on acetaldehyde generation and degradation of poly(ethylene terephthalate)

2005 ◽  
Vol 54 (6) ◽  
pp. 946-955 ◽  
Author(s):  
Shunahshep R Shukla ◽  
Elizabeth A Lofgren ◽  
Saleh A Jabarin
Keyword(s):  
Injection Molding ◽  
Ethylene Terephthalate ◽  
Processing Parameters ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

scholarly journals Poly(ethylene terephthalate) Powder—A Versatile Material for Additive Manufacturing

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2041 ◽  
Author(s):  
Hao Gu ◽  
Fayez AlFayez ◽  
Toseef Ahmed ◽  
Zahir Bashir
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
3D Printing ◽  
Injection Molding ◽  
Ethylene Terephthalate ◽  
Detailed Comparison ◽  
Processing Parameters ◽  
Polyamide 12 ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

The 3D printing of articles by the effect of a directed laser beam on a plastic powder is a demanding process, and unlike injection molding, very few polymers work well enough with it. Recently, we reported that poly(ethylene terephthalate) (PET) powder has intrinsically good properties for 3D printing. Basic mechanical properties were shown earlier and it was demonstrated that unfused but heat-exposed PET powder does not degrade quickly allowing good re-use potential. In this work, we conducted a detailed comparison of the mechanical properties of PET and polyamide 12 from different build orientations. PET powders with two different molecular weights were used. With the high molecular weight powder, the processing parameters were optimized, and the printed bars showed little difference between the different orientations, which means there is low anisotropy in mechanical properties of built parts. Based on processing experience of the first powder, the second powder with a lower molecular weight was also very printable and complex parts were made with ease from the initial printing trials; since the process parameters were not optimized then, lower mechanical properties were obtained. While the intrinsic material properties of PET (melting and re-crystallization kinetics) are not the best for injection molding, PET is eminently suitable for powder bed fusion.

scholarly journals Rapid, Chemical-Free Generation of Optically Scattering Structures in Poly(ethylene terephthalate) Using a CO2 Laser for Lightweight and Flexible Photovoltaic Applications

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Simon D. Hodgson ◽  
Alice R. Gillett
Keyword(s):  
High Speed ◽  
Ethylene Terephthalate ◽  
Fold Increase ◽  
Processing Parameters ◽  
Scanning Velocity ◽  
Average Value ◽  
Free Process ◽  
Poly Ethylene Terephthalate ◽  
Optical Profilometer ◽  
Poly Ethylene

Highly light scattering structures have been generated in a poly(ethylene terephthalate) (PET) film using a CO2 laser. The haze, and in some cases the transparency, of the PET films have been improved by varying the processing parameters of the laser (namely, scanning velocity, laser output power, and spacing between processed tracks). When compared with the unprocessed PET, the haze has improved from an average value of 3.26% to a peak of 55.42%, which equates to an absolute improvement of 52.16% or a 17-fold increase. In addition to the optical properties, the surfaces have been characterised using optical microscopy and mapped with an optical profilometer. Key surface parameters that equate to the amount and structure of surface roughness and features have been analysed. The CO2 laser generates microstructures at high speed, without affecting the bulk properties of the material, and is inherently a chemical-free process making it particularly applicable for use in industry, fitting well with the high-throughput, roll to roll processes associated with the production of flexible organic photovoltaic devices.

Microcellular injection molding of in situ modified poly(ethylene terephthalate) with supercritical nitrogen

2013 ◽  
Vol 54 (12) ◽  
pp. 2739-2745 ◽  
Author(s):  
Zhenhao Xi ◽  
Fanglin Zhang ◽  
Hua Zhong ◽  
Tao Liu ◽  
Ling Zhao ◽  
...  
Keyword(s):  
Injection Molding ◽  
Ethylene Terephthalate ◽  
Poly Ethylene Terephthalate ◽  
Microcellular Injection Molding ◽  
Poly Ethylene
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