Pet Preform vary in size, shape and color. For all PET products, the bottle can be opaque, translucent or transparent.
Opaque bottles are opaque and are preferably measured using a 45°/0° reflector or a diffuse d / 8° ball reflector:
– If you are measuring opaque bottles and want to quantify the value of visual perception, then the appropriate measurement technique is to use a reflective spectrophotometer that uses a directional 45/0° reflection geometry. This is a geometry that almost matches the geometry of the color seen by the human eye.
– If you are measuring opaque bottles and want to eliminate the gloss and texture of the sample and only look at the color, then the correct technique is to use a diffuse d / 8° reflection instrument.
Translucent bottles allow light to pass through, but only diffuse, so it is not possible to clearly distinguish objects on the other side. Both the reflection and transmission measurement modes work well depending on the translucency of the sample.
– If your customer will view the path length of the sample, you can see the slight detail of the thumb or finger through PET, and then the transmission is the preferred method of measurement.
– If you don’t see the details, the reflection is preferred.
The path length is defined as the thickness of the sample from the point where the light enters the sample to the thickness of the sample.
The transparent bottle allows light to pass through with little or no interruption or distortion so that the other side of the object can be clearly seen. These bottles can only be measured using a transfer instrument.
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