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How to Achieve Consistent PET Bottles Color

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Color is essential to branding and has a great impact on consumer perception of a product. Many beverage companies recognize the importance of color and its influence on consumer perception, strive to ensure the color of their polyethylene terephthalate (PET) bottles remains accurate and consistent at all times.

Achieving accurate and consistent color requires color management throughout the process of manufacturing the PET bottles. The color of plastic pellets is first checked using a spectrophotometer to ensure its color value comes within the acceptable range.

Next, color of PET preforms is measured to help ensure the fully blown PET bottles meet the desired color.  To ensure color data obtained are accurate, the use of either reflectance or transmittance measurement are selected according to the PET preforms opaqueness or translucency. Lastly, caps and closures are opaque and is best measured using reflectance mode. For caps and closures with textured surface top, measuring multiple points and averaging those measurements can provide a more reproducible color data.

Konica Minolta Spectrophotometer CM-5 has a wide range of accessories such as glass cell, petri dish and preform holder that can assist in measuring various types of sample, whether opaque, translucent or transparent. The CM-5 also comes with a top-port and transmission chamber that provides both reflectance and transmittance measurement modes.

Click here to watch a video of the CM-5.

To find out more about plastic bottles color measurement, write or contact us at 6563 5533 to speak with one of our color specialists.

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