Haze-gard Plus / Dual for Measuring the Appearance of Transparent Products such as Packaging Films
ASTM D1003 D1044
The appearance of a transparent product is defined by its application. Packaging film used in the food industry should be very clear and transparent, while film for grocery bags should be translucent and diffuse the light. Therefore, different raw materials are selected and processed under certain conditions. The absorption and scattering behavior of the transparent specimen will determine how much light will pass through and how objects will appear through the transparent product.
Total transmittance is the ratio of transmitted light to the incident light. It is influenced by the absorption and reflection properties.
The totallytransmitted light consists of the directly transmitted and the diffused components. Depending on the angular distribution of the diffused portion, a transparent plastic will appear differently. Visual perception can clearly differentiate two phenomena: wide angle and narrow angle scattering.
Wide Angle Scattering – Haze
Light is diffused in all direction causing a loss of contrast. ASTM D1003 defines haze as that percentage of light which in passing through deviates from the incident beam greater than 2.5 degrees on the average.
Narrow Angle Scattering – See-though Quality
Light is diffused in a small angle range with high concentration. This effect describes how well very fine details can be seen through the specimen. The see-through quality needs to be determined in an angle range smaller than 2.5 degrees. Measurement and analysis of haze and see-through quality guarantee a uniform and consisten product quality and help analyze influencing process parameters and material properties, e.g. cooling rate or compatibility of raw materials.
Objective Measurement of Transparency
A light beam strikes the specimen and enters the integrating sphere. The sphere’s interior surface is coated uniformly with a matte white material to allow diffusion. A detector in the sphere measures total transmittance and transmission haze. A ring sensor mounted at the exit port of the sphere detects narrow angle scattered light (clarity).
|Haze-Gard Plus Illuminant CIE-C
|Haze-Gard Plus Illuminant CIE-A
Haze-gard Dual (Two Standard Methods in one Unit)
ASTM D1003 D1044
The haze-gard dual objectively measures Total Transmittance and Transmission Haze according to two international specifications:
– ISO 13468 Compensation method
– ASTM D 1003 Non-compensated method
- Fast Measurement of a Variety of Samples
- Open sample area for small and large specimens
- Foot switch and automatic measurement allow hands-free operation
- Built-in statistics with average, standard deviation, coefficient of variance, and min/max
- Large storage capacity and data transfer to a printer or PC for professional documentation
- Operation in English, German, French, Spanish, and Italian – switchable Precise and Reliable Readings – Any time
- Total Transmittance and Transmission Haze in one unit
- Reference beam, self-diagnosis and enclosed optics guarantee accurate readings
- Ready for measurement without warm-up time
- Automatic and long-term calibration guarantee reliable readings ASTM D 1003