There are different polymeric interlayer materials that can be used to produce laminated (safety) glass, these are polyvinyl butyrale, ethylene vinylacetete, thermoplastic polyurethanes or ionomers.
The glass and interlayer can be of variety of colors, types and thicknesses designed to meet building code standards and requirements as necessary.
Laminated glass is considered “safety glass” - it meets the requirements of the various code organizations that set the standards for safety.
Laminated glass is a method of creating flat or bended glass bonded together over the entire surface by liquid or polymeric film materials.
Laminated glass can be made from most combinations of all types of glass, plastics glazing sheet material (polycarbonate or acrylic) and interlayers in solid form (film) or liquid form (resins) such as:
PVB, EVA, TPU, Ionomer or the use of Liquid: - one-component resins - multi-component resins - intumescent gel.
Both techniques are world wide used.
When we talk about the technique to laminate glass with a polymer film, this film technology is divided into 2 groups: • autoclave • non-autoclave.
Both techniques are based on the same physical principles (Heat, controlled temperature, pressure to bond the laminates), major difference are technical realization and sequence of process steps.
Autoclaves are used for glass laminating as they apply pressure equally in all directions at all times within the autoclave chamber, which also aids complete and uniform heat transfer for bonding lamination layers.
Manufacturer’s produces films for both autoclave and non-autoclaves. But both techniques can have high defect rates, which results in production loss.
It is highly important to understand the chemical nature of polymeric materials included in multilayer glass composition. Major important as well is maintaining strict technological rules of preparatory processes from glass, interlayer to the right lay-up and uniform pressure and temperature. Also taking into account that certain interlayers needs to pre-dry or stored with certain humidity and temperature before use. However, the main reason for defects is originally incorporated in the heating cycle. It is not only important to understand the polymeric materials, but also thermal properties of glass. Which can result in uneven heating of multilayer composite. IR heating is a method to control the IR energy to penetrate the glass as well as to heat the interlayer.
The right equipment is important for your laminating process.