Technodigm Innovation Technodigm Innovation
Technodigm Innovation
November 08, 2023

Case Study: Dispensing of Abrasive & Highly Filled Pastes (TIM material, thermal pastes, GAP-fillers)

Requirement & Task:

The number of applications of dosing highly filled and abrasive pastes (often with a particle content up to 90 %) is increasing tremendously in the recent years. Especially the use of TIM (Thermal Interface Material) in the Electronics branch as well as in the EV-Industry (Electric Vehicles & E-Mobility) is getting more and more important. The TIM pastes and liquids guarantee a controlled heat transfer at electronic parts and batteries to ensure smooth and stable functions. Also, the risk of damages of these parts due to heat overload is being reduced by these special pastes.  The recipes and quality of these materials have been improved during the recent years by adding special ingredients and additives. However, the most important ingredient is still a chemical reactive group with an excellent heat transfer rate. Typically, Aluminium Oxide or Titan Dioxide are used and mixed into these pastes. The feature of these chemicals is a very abrasive behaviour which is going to be a challenge for the dosing and dispensing system. At the same time, precision and accuracy are essential for the features of such electrical parts and battery modules.

Solution:

The PCP-technology is offering the best solution for dosing of these challenging pastes and liquids. By using a special developed rubber mixture for the stator of the PCP dispenser, in combination with a special coating of the rotor and drive shaft, we offers a perfect solution to handle such highly abrasive pastes.

At the rotor and shaft side, we also developed a special coating mixture and method to offer a very resistant and hard surface to withstand even extreme influences by very abrasive pastes and liquids. The dosing of such TIM material could be handled in a very smooth and accurate way.

Advantages & Benefits:

The PCP-technology offers tremendous advantages and benefits when these TIM should be dispensed.

By using the PCP-technology an accuracy and repeatability of +/- 99% could be guaranteed. A clean and safe process will be ensured by the adjustable suck-back of the dispenser.

The special developed rubber material for the stators and coating of rotors extends the lifetime of the rotor to 4-5 times in comparison to a standard hard-chrome plated rotor assembly and even the lifetime of the stator could be extended to 2-3 times compared to a stator with standard rubber.

We specialize in developing customized compounds for specific applications. The stator material is especially suitable for dosing applications with highly filled materials and abrasive particles. The features of these rubber compounds guarantee a smooth dispensing process for abrasive particles and the wear and tear of the stator is quite small compared to other available rubber materials on the market.

Compared to solutions, where the rotor is made of ceramic, the coated rotor assembly offers a wide range of advantages: the surface of the coated rotor is also extremely hard and robust, but less expensive compared to ceramic material. The manufacturing process of the coated rotor itself, is much easier compared to the complex process of producing ceramic rotors. Also, at ceramic parts, there is always the risk of easy breakage and damage.

Due to the perfect combination of stator and special coated rotor, downtimes and long maintenance times could be avoided. Compared to competitor’s products, the life-time of these parts is much higher. This means less production interruptions, more process reliability and safety, higher quality standards and of course, less costs.

For more information on TechnoDigm products, check out our fluid dispensers and dispensing valves.