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Dispensing Systems and Associated Materials Cure, Storage Products
December 7, 2009 |Estimated reading time: 7 minutes
— These new products enable higher accuracy and better process control when dispensing underfills, coatings, adhesives, encapsulants, and other surface mount materials. They include dispensing systems, jetting systems, valves, component mixers, a materials curing system, and other products.Small Components on Flexible Circuits
The FLX2011-MK for flexible circuits and membrane keyboards is now equipped with a jet valve dispensing system, allowing it to place smaller SMD components and LEDs on flexible circuits. The jet valve dispenses small glue dots more accurately and faster than others, and is contactless. The FLX2011-MK assembles complete flexible circuits. The machine dispenses glue, solder paste or conductive adhesives, and it places SMT components, LEDs and snap discs (metal domes) for membrane keyboards. One of the two dispensers of the FLX2011-MK is now a jet valve dispenser, featuring contactless metering of the adhesive. It meters small dots faster and more accurately than others because it shoots the dots instead of pulling them off, which is common for needle dispensing. The higher accuracy of the dots enables the placement of smaller components such as 0603 chips or below. The second dispenser of the FLX2011-MK may be an Archimedean screw dispenser, which satisfies the requirements of conductive adhesive or solder paste dispensing. This dispenser also may be a time/pressure dispenser, a Piezoflow valve or another Jet valve depending on the specific application. The assembly head of the FLX2011-MK features an optical centering system that can align SMD components, LEDs and metal domes. Therefore, all dispensing and placement required for flexible circuit production can be accomplished using one system, and the foils do not have to be moved. Production of double-sided flex boards also is possible. During production, the foils are held in position by a vacuum table. Its working area measures 500 × 300 mm, with a large support area of 800 × 300 mm. Smaller foils can be clustered and be produced like a single foil. The integrated vision system automatically finds reference marks and corrects offset and distortion. There are two alternatives of the vacuum table: One larger, featuring a working area of 800 × 600 mm, and a twin vacuum table. The twin vacuum table is double the size of the single and is movable, thus one half of it is always outside the machine where the operator can load and unload foils. Essemtec, www.essemtec.com
Dispense System for High-volume Adhesive and Sealant Dispensing
See-Flo 1100 is an improved fixed-ratio, positive-displacement, meter-mix dispense system for manual and automated adhesive and sealant applications in the production and assembly of glass, metal, plastic and composite materials. The dispense system can be used for potting transformers, sealing insulating glass, bonding solar panel modules, bonding wind blades, product assembly bonding, or sealing applications and self-contained mobile dispensing units. It meters low- to high-viscosity two-component materials such as epoxies, urethanes, silicones, and acrylics supplied by pumps or pressure tanks. The See-Flo 1100 meter and supply assemblies can be floor-mounted, mobile-cart mounted, or process integrated by Sealant Equipment with a dispensing robot assembly. The system suits dispensing continuous precision beads or large volumes of high-viscosity two-part materials. Its fixed ratio, rod displacement meter ensures the correct ratio and flow rate is dispensed onto the product being assembled. The basic See-Flo 1100 meter has no control panel and is all pneumatically operated. Advanced assemblies have electronic panels for controlling the dispensing system. Sealant Equipment & Engineering, Inc., www.SealantEquipment.com/sf1100
Conformal Coating Jet Applicator
The Precise Coat SC-400VCS Jet Applicator uses heat and re-circulation to stabilize material viscosity and afford a consistent and repeatable coating operation. The fluid is siphoned into the system and pumped through the circuit lines. No air pressure is exerted at the reservoir; eliminating air absorption into the conformal coating material. The jet can handle higher viscosities, depending on the temperature-viscosity curves of the material. The Precise Coat SC-400VCS is recommended for use in combination with Nordson ASYMTEK's Film Coater SC-105. The Precise Coat SC-400 features jetting action in a needle applicator. It suits high selectivity and precise material deposition. The material delivery is controlled by adjusting the opening and closing of the fluid path at a very small pulse rate, enabling jetting of discrete individual dots or small lines. The Film Coater SC-105, with the non-atomized leaf shaped film pattern, offers high speed and sharp edge definition for selective coating applications. The Viscosity Control System (VCS) circuit on these applicators adds stability to compensate for ambient temperature variation. The Precise Coat SC-400VCS is available for use on Select Coat SL-940E and SL-941E conformal coating platforms. The VCS circuit system uses a CE/BASEEFA certified heater. Temperatures are set and controlled through the Easy Coat for Windows XP (ECXP) application program and can maintain a variation of ±1.8°C from set-point at the applicator head. Nordson ASYMTEK, www.asymtek.com.
Non-atomized Film Coating Valve
The FC100-CF non-atomized film coating valve suits solvent-based chemistries requiring edge definition and control. The FC100-CF is ideal for building wet film thicknesses of 0.008” (0.2 mm) and above while promoting robotic coating speeds of up to 19.7 in/sec (500 mm/sec). The combination of sharp edge definition and rapid coating speeds make the film coat process an ideal selection for optimizing quality and throughput in your selective process. The FC100-CF features interchangeable film coat nozzles and a micrometer flow adjustment permitting variable flow rates. A stainless steel fluid body makes the FC100-CF compatible with all commercially available coating materials. It can generate significant, controlled film builds of low viscosity (100cps and under) chemistries faster and more accurately. For these materials, the improvements can result in coating speeds three to four times more efficient than an atomized alternative. The FC100-CF produces film patterns widths ranging from 0.3″ (8 mm) to 0.5″ (12 mm) and is available on all PVA350, PVA650, and PVA2000SF selective coating platforms. Precision Valve & Automation Inc. (PVA), www.pva.net
Calibrated Process Jetting
CPJ+ (Calibrated Process Jetting Plus) reduces process variability to maintain a constant Takt time, ensuring consistent flow rates for applications such as underfill with tight keep-out zones and for sealing applications where uniform bondline thickness is critical. Using Asymtek’s proprietary Fluidmove for Windows XP (FmXP) software, integral electro-pneumatic regulators, and precision weigh scale, CPJ+ automatically compensates for fluid viscosity changes over time as well as batch-to-batch variations. CPJ+ increases dispense accuracy for higher yields and ensures a highly repeatable process, minimizing setup-to-setup and line-to-line variation, while completely eliminating the need for operator interaction. Users enter key process parameters into the software. At programmed intervals, the dispenser measures the weight per dot and adjusts each jet to maintain a constant mass per part. Settings are recorded for traceability. Nordson ASYMTEK, www.asymtek.com
High-precision Dispenser & Optimeter
The Ultimus V and Optimeter reportedly resolve consistency issues and reduce downtime at automated dispensing stations. For fluids that change viscosity, the UltimusV high-precision dispenser provides the ability to store and then automatically adjust dispensing settings to keep the amount of fluid applied constant. To compensate for changing fluid reservoir levels, the proprietary Optimeter automatically adjusts air flow to maintain uniform deposit size. Users have the option of displaying menus and prompts in English, Chinese, French, German, Italian, Japanese, Korean or Spanish, and setting dispensing parameters in standard, metric, or SI units. EFD, info@efd-inc.com
Cartridge Filling System
The Atlas cartridge filling system is a simple, cost-effective way to package adhesives, lubricants, and other assembly fluids with greater accuracy at lower cost. It can bottom-fill 2.5 to 32 oz cartridges with consistent amounts of 2000 to 750K cps material. It eliminates topping off under-filled cartridges and filling cartridges with too much material. The Atlas Cartridge Filling System features a compact, lightweight design that allows it to be moved to different locations as needed and facilitates rapid product changeovers. It is also easy to clean. EFD, info@efd-inc.com
UVA Spot-curing System
The BlueWave LED Prime UVA high-intensity spot-curing system offers reported advantages over conventional spot-curing systems, including no consumable bulbs to change, no warm-up, cool cures, and constant intensity for thousands of hours. This spot-curing system suits spot curing of various coatings as well as adhesive bonding of polycarbonate, PVC, PET, metal, glass, and other substrates. The BlueWave LED Prime UVA generates curing energy using high-intensity LEDs, with maximum curing energy through a 5-mm diameter lightguide, with an output up to 15 W/cm2. While providing more power, the design also eliminates the safety concerns from the high heat generated by units with the LED array at the end of the wand. The relatively narrow frequency band produced by LEDs generates cooler curing temperatures at the substrate level. The unit is CE certified, RoHS compliant, offers user-friendly operation, and boasts a useful LED life of over 50,000 hours. The BlueWave LED Prime UVA also includes an intensity adjustment feature to adjust and control intensity output from 0% to 100%. Intensity level measurement is accomplished with a radiometer. The DYMAX ACCU-CAL 50-LED radiometer is used to take readings through the lightguide in process development and actual production settings. Single and multi-legged lightguides are available. DYMAX Corporation, www.dymax.com