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Styrene emissions from the spray-up and vacuum injection processes--a quantitative comparison.
Maria Lindgren1, Mikael Skrifvars, Erik Sandlund
1Luleå University of Technology, Division of Chemical Technology, Sweden.
Summary
Switching from open spray-up to closed vacuum injection significantly cuts styrene emissions by 98% in plastic boat manufacturing. Closed methods offer substantial environmental benefits, especially for products without gel coats.
Area of Science:
- Environmental Science
- Chemical Engineering
- Materials Science
Background:
- Styrene emissions are a significant concern in the manufacturing of glass-fiber reinforced plastic (GFRP) products.
- Traditional open manufacturing methods, such as spray-up, lead to substantial volatile organic compound (VOC) release.
- Advancements in manufacturing technologies aim to reduce environmental impact and worker exposure.
Purpose of the Study:
- To compare styrene emissions between open spray-up and closed vacuum injection methods in GFRP boat manufacturing.
- To quantify the reduction in styrene evaporation achieved by transitioning to a closed manufacturing system.
- To identify key process steps contributing to styrene emissions and evaluate the potential for near-zero emission manufacturing.
Main Methods:
- Two identical GFRP boats were manufactured using distinct methods: open spray-up and closed vacuum injection.
- Styrene emissions were monitored and quantified during the laminate application phase for both methods.
- A comparative analysis of emission levels was performed to determine the effectiveness of the closed system.
Main Results:
- The vacuum injection (closed) method dramatically reduced styrene evaporation compared to the spray-up (open) method.
- Styrene emissions during laminate application were reduced by 98% when using vacuum injection versus spray-up.
- Gel coat application via spraying remains a notable source of styrene emissions, even in advanced processes.
Conclusions:
- Closed manufacturing methods, such as vacuum injection, offer a significant reduction in styrene emissions for GFRP production.
- The greatest environmental benefits are realized with closed systems when manufacturing products that do not require a gel coat, enabling virtually emission-free processes.
- Process optimization and the adoption of closed systems are crucial for minimizing the environmental footprint of plastic boat manufacturing.