FASTENINGS & ADHESIVES FEATURE One-component
optically clear adhesives from DELO Industrial Adhesives have been selected to bond the display on a range of transmitters. Here the company looks into the environmental demands faced, and why this adhesive was chosen
lastic and metal pipe systems and associated solutions used for the safe transport of gas and water – such as fittings, valves, pipes, automation and connection technologies – are offered by Georg Fischer. Due to where they are situated, however, pipelines and the associated electronic equipment will have to face extreme conditions including humidity, extremes of temperature, frost and so on. One of the company’s products is the
P With the display, a glass cover is bonded
Signet 9900 Transmitter, a device used to measure and monitor fluid and gas media through a single-channel interface for sensors such as flow, pH/ORP, conductivity/resistance, pressure, temperature, filling level and salinity. It can be integrated into a control cabinet or installed in the field, and is used for many other applications in addition to media filtration, wastewater treatment and chemical production. With its 99 x 99mm display, information can be read from a much greater distance than conventional transmitters, reducing the risk of incorrect readings or misinterpretation of the displayed values.
flat onto an LCD module (LCM) using optically clear adhesive. The refractive index of the adhesive is adapted so that light reflections can be reduced by up to two thirds; and, of additional benefit, the shock resistance of the display increases because it is more stable in the event of shocks and falls. For this application, the company
initially chose a two-component adhesive that, in principle, met the optical requirements. However, Georg Fischer was looking to establish a more stable and faster production process. With two-component adhesives, air bubbles frequently form which can be time-consuming to remove and may even result in the unit being scrapped. Another problem, however, was that the complete bonding process, starting with mixing, took too long and led to excessively high storage costs in relation
SELF-CLINCHING NUTS FOR PERMANENT INSTALLATION IN STAINLESS STEEL SHEETS
New from PennEngineering are the PEM Type SMPP self-clinching nuts. These install permanently in ultra-thin stainless steel sheets and are suitable for stainless assemblies where space for attachment hardware may be limited. They have a low height of 1.4mm and a small diameter of 5.6mm, with close-to-edge mounting capabilities for installation in stainless steel sheets as thin as 0.64mm, the company explains. Of additional benefit, their corrosion resistance will be similar to 300 series stainless steel. Upon installation, a serrated clinching ring prevents the nut from rotating in service and, ultimately, the fasteners will not loosen,
fall out, or otherwise adversely affect the integrity or performance of the end-product. The nuts are manufactured from age-hardened A286 stainless steel and recommended for use in stainless sheets with hardness of HRB 90 / HB 192 or less. Thread sizes for mating hardware range from #2-56 through #6-32 and M2.5 through M3.5.
Penn Engineering
www.pemnet.com
With the transmitter display, a glass cover is bonded flat onto an LCD module (LCM) using optically clear adhesive
A clear solution for displays
to the transmitter quantities required. To overcome these issues, the company turned to DELO Industrial Adhesives.
BONDING TECHNOLOGY To meet the demands of the application, the company suggested using one- component, optically clear, adhesives. Not only can these be dispensed without bubbles and also cure in a matter of seconds under high-energy light, enabling the displays to be handled immediately, but the adhesive also cures in shadowed areas through contact with humidity in the air. This ensures that no fluid adhesive remains. To ensure the material developed for
this application, DELO-DUALBOND OC 4922, met the specified properties, Georg Fischer and DELO subjected the bonded sample to three demanding industry- standard tests: a UV test according to ASTM G154; a simulation of outdoor weather conditions according to ISO 4892-2; and heat and humidity cycling from -15˚C through 70˚C. The adhesive met the optical requirements in all tests. Georg Fischer also opted for the
DELOLUX 20 area lamp, which is suited to the adhesive. The LED lamp has a wavelength of 400nm and cures the material at a low intensity within 60 seconds. However, the valve of another manufacturer was suitable for dispensing the adhesive, so its use was also recommended. Following this, Georg Fischer was able to forge ahead with the ramp-up phase, integrate the new adhesive into ongoing production, and gradually increase the volume of units. After the successful completion of
the transmitter display project, the two companies are looking forward to tackling a new application together in the future.
DELO Industrial Adhesives
www.delo-adhesives.com/en
DESIGN SOLUTIONS | MAY 2016
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