Finishing operations add value to printing and are performed at the end of the printing process with some occurring ‘inline’ - before the printing comes off the press - but many others are performed ‘offline’, which is afterwards.
Many high quality commercial printers have a finishing department which performs a wide variety of services to enhance the function and appearance of printed pieces. Managing Director of one of Europe’s leading suppliers of flexible fabric products, Structure-flex, explains:
“Finishing is one of the most important elements of the printing process, although many customers don’t give it a second thought. Good finishing, however, improves the visual quality of the end result and also increases the longevity of the end result, helping to protect a customer’s investment.”
One of the key finishing methods adopted by Structure-flex is liquid lamination, the process of applying laminate which is encapsulated in liquid.
While lamination adds to the cost of printing, it does add important benefits, from UV protection, moisture resistance, abrasion protection, and adding an attractive finish. As well as greatly improving durability, it enhances the vibrancy of the ink colours so is a popular choice for printed items that must endure heavy use, such as consumer displays and, Structure-flex’s core business, high quality tension lorry curtains.
“Lamination is so important that we include it as standard as part of the printing process for full digitally printed lorry curtains, as they need to withstand the rigours of being open to the elements when out on the road,” continued Paul. “It’s very rare that a customer specifically asks for lamination not to be included, and this is usually when there are budget pressures, but we would only recommend that under exceptional circumstances.”
When a temporary solution is required, choosing to not laminate may seem like a good choice to save a little extra money but the cost savings are rarely large enough to justify the drawbacks. While protection against fading and moisture may not be of concern, protection against abrasion and the need for an attractive finish are always important.
The two main methods of lamination are using liquid or film, and the chosen method depends very much on the application and the surface being laminated. When it comes to surfaces that are not flat, however, film lamination is more appropriate and while more expensive than liquid laminates, film provides a variety of choices that provide superior protection against UV and abrasion.
Paul went on to explain that the traditional way of applying liquid laminate was the ‘slop and mop’ method, a two component system where a liquid substrate base mixed with an activator is applied by hand. The activator then hardens the liquid base after application.
“The hand system of applying lamination is still used in the business where quantities are low or funds are restricted,” said Paul. “This is a technically difficult process, however, and there is a large margin of error so modern printers prefer to the use of an automated laminating equipment that feeds the media through a meyer spreader bar to ensure that it’s spread exactly to the industry standard of 32 microns.”
“Vehicle graphics and wrapping use film lamination where firstly, ink is applied to the cast media which is then allowed to dry for 24-48 hrs, after which a cast laminate is applied to the surface.” explained Paul. “The process of drying or ‘gassing off’ as it is called, is crucial to ensure the solvents in the ink have dispersed so these processes do not affect the adhesive on the back of the cast vinyl media.”
With options for different surface finishes including; matte, gloss, luster, satin, crystal, optically clear, cast, calendered, anti-graffiti, dry erase and textured, there are an increasing number of possibilities for lamination and anyone wishing to consider how these can be applied to the surface of their choice should discuss the options with a specialist.
Structure-flex has manufactured and supplied a portfolio of added value products made from heavy-duty flexible fabrics for 45 years and has a history of constant progression with innovative technology. More information about the company and its services can be found at: www.structure-flex.co.uk. Follow Structure-flex on Twitter @Structure_flex, Facebook Structure-flex, and YouTube channel Structure-flex.