Surface roughness and foam morphology of cellulose acetate sheets foamed with 1,3,3,3‐tetrafluoropropene

Cellulose acetate (CA) is a bio‐based polymer suitable to replace foamed polystyrene (PS) in packaging applications. Foam trays can be produced by thermoforming of extruded sheets foamed with physical blowing agents. In this paper, the effects of various process settings and the calibration of the s...

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Published in:Polymer engineering and science 2017-04, Vol.57 (4), p.441-449
Main Authors: Hopmann, Christian, Hendriks, Sven, Spicker, Claudia, Zepnik, Stefan, van Lück, Frank
Format: Article
Language:English
Subjects:
Biopolymers
Cellulose acetate
Chemical properties
Cooling
Foams
Mechanical properties
Morphology
Observations
Plastic foam
Polystyrene resins
Sheets
Surface roughness
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description Cellulose acetate (CA) is a bio‐based polymer suitable to replace foamed polystyrene (PS) in packaging applications. Foam trays can be produced by thermoforming of extruded sheets foamed with physical blowing agents. In this paper, the effects of various process settings and the calibration of the sheet on foam morphology and surface quality of extruded CA sheets are presented. Different contact cooling options were applied in order to investigate their influence on surface roughness, density, and morphology of the sheets. By adjusting cooling parameters, blowing agent formulation, and process settings, smooth foam sheets with a surface roughness below 10 µm and a density in the range of 150 kg m−3 were produced. POLYM. ENG. SCI., 57:441–449, 2017. © 2016 Society of Plastics Engineers
doi_str_mv 10.1002/pen.24440
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source Wiley
subjects Biopolymers
Cellulose acetate
Chemical properties
Cooling
Foams
Mechanical properties
Morphology
Observations
Plastic foam
Polystyrene resins
Sheets
Surface roughness
title Surface roughness and foam morphology of cellulose acetate sheets foamed with 1,3,3,3‐tetrafluoropropene
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