Improved sealing reliability by using two-component potting on ECU terminals

Installed in automobilesECU (electronic control unit) terminalis alwaysHarsh external environments such as vibration, heat, humidity, chemicals, and dustTherefore,Potting (sealing/casting) process using two-component epoxy resinIt is necessary to provide electrical and physical insulation protection and ensure sealing reliability.
However, the following issues have become apparent with the conventional potting process:

• Poor insulation due to air bubbles
  When injecting the liquid around the terminal, air tends to get trapped, and after hardeningAir bubbles remain, reducing reliability and increasing defect ratesThis was the cause of the problem.
• Discharge volume variation
  Fluidity and properties of two-component materialsMixing ratio management is difficult, even a slight errorUneven film thickness and poor curingThere was a risk of causing
• Poor curing due to mismatch in mixing ratio
  By slightly varying the mixing ratio of agent A and agent B,Insufficient curing/overcuring/peelingProblems such as the following occurred.
• Dependence on equipment skills and maintenance burden
  Equipment settings and adjustment work are highly dependent on individual skills.Operator skill and frequent tuningwas needed.

By introducing our high-precision two-component dispenser “eco-DUO series,” the following benefits were achieved:

• Suppression of air bubbles and improved reliability
  The volumetric method is unaffected by changes in viscosity and temperature.Stable dispensingCan.Air bubble entrapmentThis reduces the amount of heat generated, dramatically improving sealing quality and product reliability.
• Highly accurate fixed quantity dispensing within ±1%
  Mixing ratio deviationWhile preventing this, components A and B are accurately measured, mixed and dispensed.Stability and reproducibility of the curing reactionThis has significantly improved the defect rate.
• Ensure uniform film thickness and sealing performance
  The discharge performance after mixing the two liquids is very stable.Even potting across the entire terminalCan.Environmental resistance, insulation, and airtightnessEnsure a high level of quality.
• Reduced adjustment work and process stabilization
  Previously, the discharge settings had to be adjusted for each lot.AutomationAndProcess stabilization and yield improvementThis contributes greatly to reducing dependency on on-site skills.

preeflow® eco-DUO330/450/600

The eco-DUO series isSpecialized for sealing and adhesive applications using two-component mixtures officialVolumetric microdispenserWith our unique rotor and stator mechanism and precise motor control, Mixing ratio accuracy within ±1%とHigh reproducibilityIt is possible to achieve both.

• Each is controlled independently and the mixing accuracy is automatically corrected.
• Compatible with both high and low viscosity two-component materials
• High-precision potting ideal for small areas and touch-up applications
• In important areas such as the ECU terminalAchieving both sealing quality and long-term reliability