In Japan’s precision optical bonding industry, adhesive dispensing plays a crucial role in the assembly of camera modules, lenses, and sensors. One persistent challenge is adhesive stringing — thin glue trails that appear when the dispensing valve does not cut off cleanly. Even minor residues can cause optical contamination, bonding failures, or rework, which is especially costly in high-volume production.

Why Stringing Happens

Stringing often occurs when high-viscosity adhesives are dispensed under unstable pressure or when valves lack fast response. In lens bonding, where precision and cleanliness are critical, this defect directly impacts yield and reliability.

Piezo Jetting as a Solution

Advanced piezoelectric jetting valves, such as the KPS2000 and KPS4000 series, are designed to prevent stringing. Their non-contact dispensing allows clean, repeatable adhesive placement without touching delicate optical surfaces.

Key benefits include:

• Fast start/stop control to eliminate trailing glue.
• High-frequency jetting for precise dots and lines.
• Real-time adjustment for different viscosities.
• Easy-to-clean nozzles to minimize downtime.

Application in Japan’s Optical Lines

For Japanese manufacturers, where miniaturization and high-resolution optics dominate, stable jetting solutions improve yield and reduce waste. Piezo valves support UV adhesives, PUR glues, and other materials commonly used in compact lens assemblies. Their modular design also integrates smoothly into automated bonding lines.

Beyond Defect Prevention

By reducing stringing and ensuring consistent dot formation, piezo jetting valves enhance both product quality and production efficiency. This makes them an increasingly important tool for Japan’s consumer electronics and automotive optical sectors.

Conclusion

Avoiding adhesive stringing in precision optical bonding requires more than process control — it requires advanced dispensing technology. With piezo jetting systems like the KPS2000 and KPS4000, Japan’s manufacturers can achieve cleaner bonds, higher yield, and more stable production, supporting the next generation of optical devices.