The interest in intelligent, transparent material is growing year by year, such as transparent screens with or without touch-screen functionality, which is one of the newest ways to use laminated films. Traditionally, glass lamination with films has mainly been used for creating security glass, a pane of glass that is more resilient to blows and shocks.
The BOOST project (website in Swedish) was given the opportunity to buy equipment for lab environment glass lamination to manufacture prototypes that are now part of RISE in Växjö. The Smart Housing pilot study “Review of film materials for glass lamination” was connected to the lamination oven. The purpose was to look at properties and usage areas and lay the foundation for experimental prototype manufacturing in a lab environment.
Researching different laminates
The partnership identified 13 interesting film materials that were tested. Four PVB type (PolyVinylButyral) and nine EVA type (EtylenVinylAcetat).
• Crystal Pujol
• Matt White
• Super White
• Two “Visual” of different thicknesses
• 80 / 120
• Colour Blue
• Colour Green
• Colour Grey
• Two “Clear” of different thicknesses
In total, 100 tests were carried out. The sample size was 10×50 cm and contained two 4-mm panes of glass with lamination between them.
The type and thickness were noted, and the tests researched the maximum sheer stress and power used to break the sample using three-point bending, and how large the maximum deflection became.
Same results achieved in lab environment as in industrial scale lamination
The pilot study showed that the same results could be achieved with the lab lamination equipment as with industrial scale lamination. This was an important finding for the companies, as they want to be able to take advantage of the lab equipment in their development work or for testing new films or new combinations of films with other material.
The study also aimed to find out if there were any strength differences between the glass and the laminate, depending on whether the tin side or air side of the glass was used against the laminate. However, the sample was too small to be able to draw any solid conclusions as to whether this was a significant factor.
Gathering ideas and building knowledge
During the course of the project, visits were also made to Uniglas, GMAX and Osbyglas. This contributed to the knowledge building and to surfacing interesting research and development questions.
By creating a range of different tests and with different combinations, researchers have become familiar with the laboratory lamination equipment and how to work with “unusual” materials. Collaboration with other Smart Housing projects has led to increased knowledge about how to laminate glass and wood together. This was researched for both interior and exterior applications.
Lamination development can now be accelerated
The foundation has now been laid for future prototype manufacturing. At RISE Glas, testing different methods and materials for lamination is now simple and quick.
Project team: RISE, Linnaeus University, Department of Structural Mechanics at the Faculty of Engineering, Lund University, Forserum Safety Glass, GFAB Sweden, Uniglas, Chromogenics, Osby Glas and Systemglas
Project manager: Ingemar Malmros, RISE