Novo-Curve 4 Application Notes – Gloss Measurement Of Moulded Plastic Parts

Overview

Gloss has been defined as ‘The attribute of surfaces that causes them to have shiny or lustrous, metallic appearance.’

Manufacturers design their products to have maximum consumer appeal. Traditionally, a high gloss finish is often perceived to be a higher quality product and can therefore command a price-premium.

It is for these reasons that many manufacturers monitor the gloss of their products to ensure batch-to-batch consistency of their products.

Method

Example – Evaluating high clarity blister packs

STEP 1: The two sections of the part were separated for measurement.
STEP 2: Using the continuous read setting on the Novo-Curve the sample areas were measured and the maximum values recorded for each area. This was repeated 6 times lifting and replacing the sample each time along the marked area on the surface.

STEP 3: Different values were measured along the measuring beam axis (sample in line with axis) to values measured across the sample (sample at 90 degrees to measurement axis).

Results

Example – Blister Packs

Conclusion

Observations of results

It was possible to obtain accurate peak (actual) gloss measurements for each part.

It may also be useful to consider a custom location adaptor for the samples, this can be 3d printed to suit each part which should improve accuracy due to improved location.

Features of the Novo-Curve

Simple checking of curved surfaces

For curved surfaces, the correct gloss value is the peak value identified on the sample. Continuous read mode on the Novo-Curve 4 greatly simplifies this process.

Certainty of measurement

For improved gloss control, calibrate on a standard that matches closest to your sample. Additional standards are available from matt to mirror finish.

Repeatable sample positioning

Bespoke sample securing systems allow multiple samples to be measured in exactly the same place*. *Requires additional accessory
Novo curve footswitch

Hands free sample measurement

The optional footswitch enables the user to easily manipulate the sample for measurement.

Measurement of small samples

Measure samples too small to be measured with a standard glossmeter.

Custom Part Adaptors

For an exact fit for small complex shapes, a custom cutout enables the sample to measured in exactly the same spot each time.

Novo-Curve 4 Application Notes – Gloss Measurement Of Moulded Plastic Parts

Rhopoint Instruments
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