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Two-component potting machines are critical equipment in electronic packaging, new energy, and automotive electronics. This article details the core processes of AB glue mixing ratio, vacuum degassing, and mixed potting machine, revealing the technical threshold for high-quality potting.
Introduction
Two-component vacuum potting machines inject epoxy resin, polyurethane, silicone, and other AB adhesives into the workpiece cavity through precise mixing ratio, dynamic mixing, vacuum degassing, and other processes, then cure them. Compared with single-component dispensing, it undertakes "structural packaging"—it must seal, dissipate heat, and bear stress. This article deconstructs the key technical nodes of this complex process.
1. AB Adhesive Mixing Ratio: Precision Leap from "Volume Ratio" to "Mass Ratio"
Traditional potting machines mostly use gear pump volume ratio solutions with precision of about ±2%. High-end models use mass flow meters + servo closed-loop to achieve ±0.5% mass ratio control, and can automatically compensate for temperature drift.
2. Dynamic Mixing: The Core of Determining Adhesive Uniformity
Mixing methods are divided into static tube mixing and dynamic valve mixing. Dynamic valves achieve millisecond-level uniform mixing through high-speed rotating mixing elements, especially suitable for adhesives with large viscosity differences or high filler content.
3. Vacuum Degassing: The Last Mile of Bubble Control
The air pressure inside the vacuum chamber can be reduced to -0.1MPa, allowing dissolved gas in the adhesive to escape before potting. For thermally conductive adhesives containing silver powder or alumina, insufficient degassing will cause local uneven heat dissipation.
4. Pulsation Suppression of Metering Pumps
Gear pumps and screw pumps have inherent pulsations at the outlet end, which need to be suppressed through accumulators, dual-pump alternation, or servo drives to avoid local cavity glue shortage.
5. Workpiece Preheating and Post-Curing Process
Preheating of workpieces before potting can reduce adhesive viscosity and improve fluidity; post-curing eliminates internal stress through stepped heating, avoiding curing cracking.
6. Equipment Cleaning and Maintenance
The mixing valves and pipelines of two-component potting machines are easily blocked due to adhesive curing. Equipment equipped with automatic cleaning functions can significantly reduce manual maintenance frequency.
Conclusion
Two-component potting machines are a composite of precision fluid control + vacuum technology + process chemistry. When selecting models, attention should be paid to four hard indicators: "mixing ratio accuracy, mixing uniformity, vacuum degree, cleaning convenience," rather than simply potting speed.
Resource:
https://secondintelligent.com/product/in-line-vacuum-two-component-fully-automatic-glue-potting-machine/
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