The Challenge of Glue Stringing and Breakage in Optical Lens Assembly

Taiwan is a major hub for optical lens packaging, producing camera modules, AR/VR lenses, and smartphone optics for global markets. In high-volume production, glue stringing and broken glue (incomplete dispensing) are common issues that can reduce yield, affect lens alignment, and cause rework. These problems are particularly critical in high-precision lenses, where even minor adhesive defects can lead to optical aberrations or mechanical instability.

The root causes often include inconsistent glue flow, improper valve control, or manual dispensing limitations. To address these challenges, advanced solutions such as the KSV1000 series concentric screw valve offer precise control over high-viscosity adhesives, ensuring smooth, continuous dispensing.

Why Precision Screw Valves Are Essential

1. Consistent Flow for High-Viscosity Materials
Optical lenses often require UV-curable, thermal, or silicone adhesives, some containing particles or fillers for enhanced thermal or mechanical performance. The KSV1000 uses a servo-driven concentric screw mechanism to provide precise volumetric control, even for medium-to-high viscosity fluids. By controlling both forward and reverse screw rotation, the valve prevents adhesive drooling, stringing, or interrupted flow, ensuring every lens receives the correct amount of glue.

2. Micron-Level Dispensing Accuracy
High-performance optical modules demand exact adhesive placement to maintain alignment between lens elements. The KSV1000’s repeatable dispensing accuracy up to 98% and minimum output of 0.1µL allows micron-level control of adhesive volume, reducing risks of overflow, misalignment, or uneven bonding lines.

3. Quick Maintenance and Material Flexibility
Production lines often switch between different adhesives or lens sizes. The KSV1000’s quick-release valve design and syringes guide installation system allow fast material changes and cleaning without lengthy downtime. Its compatibility with UV, thermal, and PUR glues ensures versatility for various optical lens applications in Taiwan’s factories.

4. Closed-Loop Control to Prevent Breaks and Inconsistencies
One of the main causes of broken glue is sudden pressure fluctuations or inconsistencies in the supply system. The KSV1000 integrates closed-loop servo feedback, maintaining stable pressure and flow during each dispensing cycle. This feature minimizes intermittent dispensing, prevents stringing between lens components, and ensures a smooth, continuous glue line.

5. High-Speed Production without Sacrificing Precision
Taiwan optical lens manufacturers face high throughput demands, often producing tens of thousands of modules daily. The KSV1000 allows rapid dispensing while maintaining consistent quality, combining speed and precision without the risk of glue defects that could slow down downstream assembly.

Applications in Taiwan Optical Lens Packaging

Taiwan manufacturers leverage the KSV1000 for:

Camera module lens bonding – precise adhesive placement without overflow or stringing.
Transparent cover lens assembly – smooth, bubble-free bonding to protect sensors.
AR/VR optical assemblies – handling high-viscosity adhesives with particle fillers while maintaining repeatable flow.
Multi-lens stacked modules – preventing glue breakage in complex, multi-component lens arrays.

Conclusion

In Taiwan’s competitive optical lens packaging industry, avoiding glue stringing and breakage is essential for achieving high yield and consistent optical performance. The KSV1000 concentric screw valve provides the precision, flow control, and material flexibility needed to overcome these challenges.

By adopting advanced screw valve technology, Taiwan optical lens factories can ensure smooth, consistent dispensing, reduce rework, and maintain high production efficiency—supporting the manufacturing of next-generation camera and optical modules for global markets.