Processing thin sheets in PMMA is a delicate operation and producers will want to ensure the finished product is not only aesthetically attractive, but also resistant over time. Many such sheets are used to cover panels and provide a glossy or mirror-like finish, so the surface has to be top quality with zero defects. Since we designed and installed the first roller coating solution specially tailored to process these sheets, our customers appreciate the following features:
- combination of upper application roller and lower support roller working together
- cleaning system developed for the lower support roller
- processing environment created to avoid dust pollution
A closer look at the application processProduced to provide a lasting finish and appealing surface, thin extruded PMMA sheets are a delicate semi-processed material when it comes to coating them. This has led us to develop a process which is suited to such a substrate as it passes through the roller coater, in a controlled environment where dust is kept outside.
The application unit is made of 2 rollers (topside for coating application, beneath the sheets to provide physical support) that firmly act on the plastic sheet leaving no space for sheet warping as it is fed through the machine. A scraper blade which removes excess lacquer from the lower application roller also contributes to optimising the coating process of such thin sheets.
Line integration for a complete solutionFurther to the specially developed roller coating equipment, the line can be completed with pressurised booths including air filtration and conditioning systems to avoid dust pollution and guarantee a controlled processing environment.
Prior to the coating stages, careful surface cleaning operations are also performed to ensure spotless surface finishes. Together with each customer we will select the most appropriate solution according to the desired result.
Following the coating stages, the PMMA sheets can be dried in different ovens. Our UV-I inert curing solution maximises the ultimate physical resistance. This solution also drastically reduces the need for photoinitiators, making it a more sustainable process and reducing related costs.
If you require a deep matt finish, our excimer matting technologies are also an environmentally-friendly option using less nitrogen than standard solutions. Exydry is an oven designed to process flat surfaces and will ensure a fingerprint-proof, soft-touch, deep matt finish, even on slightly raised panels.
Equipment you may consider to handle the entire processCefla Finishing has the broadest range of finishing technologies and machines that have been designed to deal with specific processes such as PMMA sheets. Here is a list of those machines with relevant links:
- Roller coating solutions
- UV-I inert curing oven
- Exydry excimer matting oven
- Pieffe compact vertical oven
Contact us and you can fix an appointment with our specialists and maybe run a live test.