CONTRACT MANUFACTURING
methods for pumping pre-cured gels usually include piston pumps which are notorious for frequent labor intensive rebuilds. Single component materials are the most straight forward to apply. Flow rate and cycle time are much less of an issue because the material is dispensed in a thinner, more flowable form, which is later cured to its final hardness. Another important consideration is that fillers are more likely to settle and pack up inside fluid lines when the material is lower in viscosity.
Two-component materials pose a unique challenge, but depending on their cure rate, can eliminate the need for inline curing systems while still achieving swift cycle time and curing to a permanent solid. Mix ratio is critical to material performance so equipment must be precise enough to ensure repeatable curing of the material. Fortunately, most 2K TIM chemistries are provided in a convenient 1:1 ratio that provides for good mixing in a static nozzle. Given the challenge of abrasive thermal materials, PVA has developed several solutions designed for highly filled and abrasive material. Production volume and frequency of refilling material containers is often the determining factor for selecting the best dispensing package.
For lower production volume, cartridges are often a more economical solution for manufacturers. The SCTP provides for
metering directly out of cartridges. Using a precision linear actuator to drive material out of the cartridge, a precise proportioning of material can be achieved while eliminating wearable components. This principal is frequently used with single component thermal greases as well. When higher production throughput is required, pails of material may be more desirable. Specially designed pail pumps are used for transferring this material to the metering dispense head. These pumps have a special hard coating applied to increase abrasion resistance combined with minimal friction points to allow smooth flow and maintain fluid consistency. For accurate, variable ratio, point of dispense metering; PVA has developed the MR2. This technology uses metering pistons coupled with carbide sleeves and diaphragm style valves to offer a resilient and accurate dosing platform for nearly any 2K material. In many applications a high level of precision is required. For small volume dosing, progressive cavity pumps deliver precision metering with low shear and no reciprocating parts. As electronic components continue to shrink in size PVA’s PCP technology matches small scale with precision. You can dose fluid down to a µL scale with +/- 1% accuracy. This technology is applicable to both one and two component materials. The diverse nature of dispensing requires a wide variety of solutions for every application. PVA is dedicated to being a leading provider of precision dispensing equipment for manufacturing. As new dispensing applications
emerge, PVA seeks to develop new and innovative technology that makes
manufacturing more efficient for an ever-evolving future.
Precison Valve & Automation (PVA)
www.pva.net
MAY 2021 | ELECTRONICS TODAY 51
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