Adhesives can do more than just bond two parts together. They can conduct electric current—or insulate current. They can transfer heat, keeping assemblies cool. They can keep water, chemicals and dust out of an assembly.
Here’s a look at the latest at the latest adhesives and the equipment to dispense and cure them.
Epoxies for Electronics Assembly
Image: United Resin
United Resin offers numerous epoxies for electronics assembly, several of which are UL-approved as flame retardant. Both filled and unfilled epoxies are available in a range of viscosities.
The epoxies are used for potting, encapsulating and casting electronic components, including coils, transformers, circuit boards, magnetic components, sonar components, noise interference filters and surge protectors.
One- and two-component epoxies can be formulated to withstand vibration, shock, heat and chemicals. They bond well to PTFE, nylon, acetal, ceramics, Delrin, PEEK, stainless steel and other hard-to-bond to substrates. Quick-set formulations set in as little as 45 seconds. Curing time can be accelerated with heat. Various mix ratios are possible, and epoxies can be formulated to meet aesthetic considerations, such as gloss or matte surface finishes. All materials are nonhazardous, REACH/RoHS compliant, and contain no solvents.
See this company at The ASSEMBLY Show South April 16-17 in Nashville, TN.
United Resin
www.unitedresin.com
Epoxy Is Safe for Indirect Food Contact
Image: Meridian Adhesives
Epoxy 10-3063 is two-component potting compound and adhesive. It provides good water resistance, adhesion and toughness. Packaged in a convenient dual-barrel cartridge system, the epoxy meets Food and Drug Administration regulations permitting use in “indirect” food contact applications.
The adhesive cures in 24 hours at room temperature, but it will cure in 1 hour at 65 C or 15 minutes at 105 C. It offers excellent adhesion; chemical and corrosion resistance; and electrical insulation. It has an operating temperature of -40 to 130 C. The mix ratio is 100-to-50. When mixed, it has a viscosity of 36,000 centipoise.
The cured material has a flexural strength 13,000 psi, a compression strength of 33,000 psi, and a tensile strength of 8,600 psi.
See this company at The ASSEMBLY Show South April 16-17 in Nashville, TN.
Meridian Adhesives
meridianadhesives.com
Meter, Mix and Dispense System
Image: Dopag
Eldomix is a programmable system for metering, mixing and dispensing two-component adhesives.
Pressure vessels supply the materials to a pair of three-phase, asynchronous, motor-driven gear pumps, where they are proportioned at the preselected ratio. Each gear pump is protected against over-pressure. The machine is fitted with a metering computer with touch-screen terminal and a static mixing system that includes a two-component valve combined with a disposable static mixer.
The mix ratio and output rate are programmable. It can dispense shots or continuous flow.
Eldomix 100 is a benchtop model; Eldomix 600 is a mobile system on castors.
See this company at The ASSEMBLY Show South April 16-17 in Nashville, TN.
Dopag
www.dopag.com
Tabletop Dispensing Robot
Image: MTA Robotics
The PC-controlled TR300 tabletop dispensing robot features a working area of 300 by 300 millimeters. It is used for semiautomatic volumetric dispensing operations of liquid or viscous materials.
The TR300 can be equipped with all of MTA’s dispensing heads: the NVD mono-component dispenser, NBD two-component dispenser, mini-NVD mono-component dispenser, mini-NBD two-component dispenser, CFD continuous flow mono-component dispenser, CBD continuous flow two-components dispenser, CD cartridge mono-component dispenser, and jet dispenser.
All three axes of motion are fully programmable. Engineers can program various dispensing parameters, including volume, dispensing speed and mix ratio. It can dispense dots, lines or curves.
See this company at The ASSEMBLY Show South April 16-17 in Nashville, TN.
MTA Robotics
mtarobotics.com
Adhesive Bonds Commutators
Image: Panacol-Elosol GmbH
Vitralit UV E-2113 is a UV-curing acrylic adhesive for the rapid bonding of commutators. The adhesive can be applied robotically and cures within seconds under UV light.
It is a highly viscous and stable adhesive. Its optimized flow characteristics allow it to dispense easily into cavities. This adhesive has high adhesion to all metals: It adheres to the coil wires as well as to the solder joints and the commutator. The adhesive can be applied in a ring around the commutator in automated processes. This one-component adhesive does not require special handling during transportation, storage and dispensing.
The adhesive cures in a few seconds with light in the UVA range or in the visible range at a wavelength of 405 nanometers.
After curing, it has a dry surface and is highly resistant to vibration and impact. It creates low-stress bonds, and it resists temperatures from -40 to 150 C.
See this company at The ASSEMBLY Show South April 16-17 in Nashville, TN.
Panacol-Elosol GmbH
www.panacol.com
Silicone Gap Filler for Thermal Management
Image: Wevo-Chemie GmbH
Wevosil 26040 FL is a gap-filling silicone for use as a thermal interface material. The material features a thermal conductivity of 4 watts per meter-Kelvin, a low bond line thickness (less than 70 microns), and enhanced sedimentation stability. In addition, the dosing profile has been sharpened to ensure an efficient production process.
The product ensures efficient heat dissipation and also bridges small gaps thanks to the specially developed filler combination. Material properties, such as reactivity, can be customized to individual needs.
Once mixed, the material can sit for three months without having to be rehomogenized. It has been formulated for fast dispensing speeds and fine dosing patterns. Compared to thermally conductive pads, this ensures greater precision and flexibility in production, which is particularly advantageous when manufacturing large unit volumes.
The material resists temperatures of up to 200 C, and it is flame-retardant. It has good mechanical properties, including elongation at break of more than 30 percent. When cured, it meets the requirements of the PV 3040 test specification for low-volatile emissions in the automotive industry.
Wevo-Chemie GmbH
www.wevo-chemie.de
Robot Automates Dispensing
Image: Nordson EFD
Compared with previous models, the GVPlus robotic dispensing system offers improved repeatability, bigger payloads, simplified setup, and superior vision capabilities. Repeatability is now ±8 microns. Setting up the robot is easier due to a new dual mounting flange that enables a tool payload of up to 4.5 kilograms. The working envelope measures 400 by 400 millimeters.
The CCD smart vision camera delivers high-quality images even on challenging surfaces like glass, mirrors, plastics, and nontransparent clear surfaces. To ensure accuracy, the system’s software automatically adjusts as in-process variations occur.
Nordson EFD
www.nordson.com
