Effect of recycling and injection parameters on gloss properties of smooth colored polypropylene parts: Contribution of surface and skin layer

The aim of this article is to investigate the optical properties of a recycled polymer during numerous processes. The effects of different process parameters (number of grinding‐injection cycles, material temperature, mold temperature, and injection rate) on gloss and color properties of a buff‐colo...

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Bibliographic Details
Published in:Polymer engineering and science 2019-06, Vol.59 (6), p.1288-1299
Main Authors: Mbarek, Souad, Baccouch, Zaineb, Eterradossi, Olivier, Perrin, Didier, Monasse, Bernard, Garay, Helene, Quantin, Jean‐Cristophe
Format: Article
Language:English
Subjects:
Engineering Sciences
Gloss
Injection molding
Materials
Optical properties
Plastic scrap
Polymers
Polypropylene
Process parameters
Propylene
Skin
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Summary:The aim of this article is to investigate the optical properties of a recycled polymer during numerous processes. The effects of different process parameters (number of grinding‐injection cycles, material temperature, mold temperature, and injection rate) on gloss and color properties of a buff‐colored polypropylene containing 2wt%/wt of pigment was considered. The variations of properties are in the same range that is observed by changing processing parameters. It is found that the roughness is not able to explicate the variation of the optical properties for these variations of conditions. In addition, the optical properties of the skin layer of the injected parts are associated with the observed gloss and color variations. Moreover, the change of spherulite dimensions is related with optical changes. POLYM. ENG. SCI., 59:1288–1299 2019. © 2019 Society of Plastics Engineers
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.25112