Channel: Adhesives and sealants
Graco: continuous improvements in adhesive quality and efficiency

2015-12-20 | Adhesives and sealants

Producing both insulating glass and curtain wall incorporates bonding and sealing steps using adhesives with multiple components. The success of these steps depends on proper mixing and accurate, on-ratio dispensing of the adhesive components. While there are a variety of technologies available to the industry, many of these widespread mixing and dispensing methods have serious drawbacks that can impact final product quality, material costs, and production time. However, recent additions to the proportioner market incorporate new technology that addresses many of these drawbacks. This new technology offers improved real-time ratio assurance, reduced material usage and enhanced tracking of key information. The quality of the final product is improved, and both material cost and production time are decreased.

Graco: continuous improvements in adhesive quality and efficiency
The glass industry faces unique adhesive challenges
A proportioner is commonly used to mix and dispense multiple component adhesives in insulating glass and curtain wall applications.
Adhesive and sealing proportioners, whether hydraulic or pneumatic, use mechanically linked pumps, rocker arms and gear pumps. These existing proportioner systems have many drawbacks, the main issues being adhesive dispense accuracy, operational difficulty, material waste, frequent repair and maintenance, high capital costs, and lengthy equipment lead times.
Adhesive and sealant manufacturers formulate their materials to be mixed at specific ratios for maximum performance. Current proportioner technologies that rely on mechanically linked pumps offer no real-time ratio control. This is a problem when mechanical malfunctions occur, because it is impossible to tell that dispensing ratios are wrong until after the adhesive has been placed on the glass. Deviations from manufacturer-recommended mixing ratios can result in products that do not adhere or fail to cure, creating material waste and product rework and of course losing time.
These existing proportioner technologies also create many challenges to operators, especially as far as ratio settings are concerned. Operators must manually adjust ratio settings, with the smallest error leading to inaccurately mixed materials and the issues previously described. Complex cleaning processes including base purges, sensitive dispensing adjustments, and...


Article taken from Glass-Technology International bi-monthly magazine (6 issues per year)
Year: 2015 number: 6
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