May, 2021
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Page 65
Continued from previous page Single component materials are the
The Benefits of Dispensing Thermal Interface Materials Users can dose fluid down to micro-
most straightforward 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 achiev- ing swift cycle time and curing to a per- manent solid.
Mix ratio is critical to mate-
rial performance. Equipment must be precise enough to ensure repeatable curing of the materi- al. Fortunately, most 2K TIM chemistries are provided in a convenient 1:1 ratio that pro- vides for good mixing in a static nozzle.
Given the challenge of abra-
sive 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 vol-
umes, cartridges are often a more economical solution for manufac- turers. The SCTP provides for metering directly out of car- tridges. Using a precision linear actuator to drive material out of the cartridge, a precise propor- tioning of material can be achieved while eliminating wear- able components. This principal is frequently
used with single component ther- mal greases as well. When high- er 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 coat- ing applied to increase abrasion resistance combined with mini- mal friction points to allow smooth flow and maintain fluid consistency. For accurate, variable-ratio, point-of-dispense metering, PVA has developed its 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 mate- rial.
Dispensing Precision In many applications a high
level of precision is required. For low-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 match- es small scale with precision.
Dispensing allows materials to be placed in nonstandard shapes without wasting any extra.
liter scale with ±1 percent accuracy. This technology is applicable to both one- and two-component materials. The diverse nature of dispensing
Cohoes, NY 12047 % 518-371-2684 E-mail:
kfagan@pva.net Web:
www.pva.net r
requires a wide variety of solutions for every application. PVA is dedicated to being a leading provider of precision dis- pensing equipment for manufacturing. As new dispensing applications emerge, the company seeks to develop new and innovative technology that makes manu- facturing more efficient for an ever- evolving future. Contact: PVA, One Mustang Drive,
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