Measuring color on curved or bent plastic surfaces presents challenges due to light reflection, inconsistent angles, and surface variations. However, using the right spectrophotometer and measurement techniques ensures accurate and repeatable results.
1. Choose the Right Measurement Geometry
Spectrophotometers use different geometries, and selecting the correct one is crucial:
• D/8 Sphere Geometry : Ideal for curved surfaces as it diffuses light, reducing the impact of surface irregularities.
2. Use a Portable or Handheld Spectrophotometer
A portable spectrophotometer allows precise positioning on curved plastics, ensuring consistent contact and angle for measurement. Look for models with small aperture sizes to measure small or highly curved areas accurately.
3. Optimize Sample Positioning and Handling
For repeatable results:
• Hold the plastic sample properly in place to minimize variations.
• Ensure consistent placement of the spectrophotometer on the surface.
• Measure the Lab values accurately to assess color quality of the sample.
4. Consider Gloss and Surface Finish
Curved surfaces may have gloss variations affecting color readings. Using a d/8 spectrophotometer helps maintain accuracy.
By following these best practices, manufacturers can achieve reliable and precise color measurement on curved plastic surfaces, ensuring quality consistency across production.
Qualiper offers a comprehensive range of spectrophotometers tailored to meet the diverse needs of the manufacturers. With both portable and benchtop options available, Qualiper provides flexibility and versatility in color measurement solutions. Get in touch with us.