Dispensing systems for direct and structural glazing
Efficient glazing plays an important role in modern structures. Firstly, it should provide sufficient noise protection, and secondly, it should ensure good energy efficiency. This applies not only to window elements, but in particular to the large glass facades that are prominent in modern high-rise architecture. Precise and modern metering and mixing systems are used in various glazing applications – for example, in the production of insulating glass, the application of a secondary coating (edge seal) ensures a reliable sealing of the individual elements.
RELIABLE PROCESSING OF SPECIAL ADHESIVES
Structural glazing facades belong inarguably among the key features of modern architecture. With their clean and highly functional design, they are a daily reminder that we live in an era, in which form needs to follow function. Structural glazing facades are formed by bonding the supporting framework to the glass. This gives the effect of a seemingly frameless glass facade. The bonding process relies on special dual-component adhesives, which are processed with appropriate metering and mixing systems. Precise metering is particularly important here, as it is the only way to ensure reliable bonding of the individual elements. The same applies for direct glazing procedures used for the production of insulating glass as well as in the automotive industry. Here, the glass is bonded to the frame, again using a 2K adhesive. Direct glazing has numerous benefits, including improved heat and noise protection, slimmer profiles and increased light incidence.
For all glazing applications, METER MIX® offers proven and reliable metering and mixing systems developed to high quality standards through decades of experience and intensive collaboration with material manufacturers. The systems have been specifically designed for the processing of dual-component adhesives based on silicone, polyurethane or polysulfide, and they adhere precisely to the required mixing ratio. The application can be carried out either manually using a METER MIX® system or integrated into an automated process.
STRUCTURAL GLAZING WITH SILICONE
BONDING AND SEALING
Complex, yet strikingly effective applications
No matter which industry we look at – be it electronics, automotive or aviation – we will notice that bonding has replaced the established joining methods such as welding or screwing. For example, up to 18 kilograms of adhesive are used in the production of a single car. The electronics industry relies on adhesives for potting or sealing of components. In any case, bonding is a complex technique and requires significant specialist knowledge. Material manufacturers are constantly working on new adhesives and increasingly often they are also tailoring them to specific applications. In many cases, bonding is the only viable technique of binding modern materials.
ADHESIVE BONDING WITH EPOXY RESIN, POLYURETHANE AND SILICONE
Adhesive material can be based on epoxy resins, silicones, polyurethanes or methacrylates and it can be a one or a multi-part substance. Multi-component adhesives are metered and mixed by dispensing systems according to a fixed mixing ratio. Polyurethane adhesives often perform a sealing function, are easy to process and have a very good chemical resistance. Most commonly used are epoxy adhesives. They can be processed very well at room temperature and are highly resistant.
METERING METHACRYLATE ADHESIVES
Methacrylate adhesives usually have a very short pot life, which can complicate their processing. On the other hand, they offer the advantage of short curing times and particularly high strength. They are an excellent alternative for the joining of metal, glass and duromeric plastics.
PRE AND POST-TREATMENT OF COMPONENTS
Adhesives do not adhere easily to all components. Depending on the component properties, a pre-treatment such as by corona flame, corona primer or brushing, may be required. The subsequent application of the adhesive can be carried out in various ways, for example in a dot or bead form. After the components are joined, curing systems such as infrared light, ultraviolet light or continuous furnace can be used to accelerate the bonding reaction and speed up the time in which the components are available for the next production step.
In summary, the bonding and sealing process is a relatively complex one with many factors at play. The selected material must be a perfect fit for the application, the application parameters must be clearly and precisely defined and lastly, a metering solution capable of processing the selected material in the defined way needs to be identified. METER MIX® offers robust and proven metering systems which are continuously adapted to the evolving demands of adhesive technology. They present an accessible solution to process-reliable and high-quality processing of adhesive materials.