Rhopoint ID Imaging Transmission Appearance Meter
Effect of surface roughness
Data is shown for PMMA films (0.25 mm thickness) with a varying degree of roughness on the surface facing the graticule. Surface roughness primarily affects out-ofcontact visual appearance:
- Rhopoint ID enables accurate quality control and product specifications depending on the intended enduse (whether in-or out-of-contact).
- The instrument also makes possible optical diagnostics of surface or internal defects in polymer articles, as well as detecting wear in processing equipment such as molds or chill rolls.
1mm air gap,
Very rough film,
1mm air gap,
Semicrystalline polymer films
Data is shown for polyethylene and polyester films (comparable 50–80 μm thickness). Analysis of ID provides a more comprehensive picture of visual appearance than is possible with conventional instruments:
- While it is difficult to combine the “haze” and “clarity” values generated by conventional instruments into a single meaningful measure of transparency, Rhopoint ID quantifies visual appearance using a single scale that correlates with human perception.
- Contact and out-of-contact ID are not necessarily correlated for all materials (e.g. the cross-over in ID data
for the films above).
- Precise material selection for the desired applications.
Polyethylene film in
with Rhopoint ID
8mm air gap
The Rhopoint ID-E and Rhopoint ID-L explained
|Rhopoint ID-E||Rhopoint ID-L|
|Operate in stand alone mode|
|Software for advanced analysis|
|Measures (ID) with the sample material in contact with test target|
|Replicate real world conditions with a user variable gap between the sample material and test target|
|Suitable for sheeted material up to 300μm thicknes|
|Live view makes it easy to position test sample and locate specific areas of interest|
|Save, reload and compare test data and images|
|Mesaure multiple sample with batch and trend analysis|
|Assess and compare test materials with a specially designed visual test area on the target image|
|Mesaure sample homogeneity and directionality in detailed sample results and images|
|Measure any planar material with thickness up to several mm|
It is often required to quantify the appearance characteristics of small components, defined coloured or printed areas on a material. The Rhopoint ID-L measures ultra small areas for optical quality; the live view screen allows these small parts or areas to be positioned perfectly for accurate measurement.
Blown and extruded films often exhibit unwanted directionality, an effect which reduces appearance quality and may reduce other important characteristics such as strength and barrier properties.
Directionality can be reduced or eliminated with optimised process parameters: Rhopoint ID-L can measure in-situ during set up and manufacture to improve the quality of film production.
Rigid plastics are used to protect and transport goods- see through qualities are governed by their formulation and process parameters (temperature, dwell time etc). The Rhopoint ID-L with batch and quality control is an invaluable tool in the plastics development laboratory.
Many consumer goods have components which require close control of their see-through optical characteristics.
Rhopoint ID can be used to quantify the appearance of glass, plastics and other transparent and translucent materials,
including liquids and suspensions.
Packaging showing variable air gaps between the product and protective film
Dependent on the application flexible packaging can be used in contact with or with an air gaps between the item protected and the film - the Rhopoint ID is the only instrument that can determine the final appearance of the packed material in these conditions.
A graph showing the evolution of
ID with air gap distance
|Specification ID||Specification T|
|Repeatability||0.05 SD*||0.05 SD*|
|Reproducibility||0.10 SD*||0.10 SD*|
|Effective operating range||Materials T>60%|
|Measurement Mode||Contact Only||Contact and Non Contact|
|Non Contact Distance||N/A||Up to 40mm|
|Material Thickness||← 300μm||← 30μm|
|Connection||N/A||USB / Ethernet LAN|
|Imaged Area||20mm x 20mm|
|Min Area - ID||12 x 8mm||6 x 2mm|
|Min Area - T||12 x 8mm||2 x 2mm|
|Image Format||N/A||16 Bit Tiff|
|Image Size||N/A||1280 x 1024|
|Dimensions h x Ø||470 x 125mm|
|Packed Weight||7 Kg*|
|Included accessories||Check Standard||Check Standard|
|Product||Included accessories||Order code|
|Rhopoint ID-E||Calibration check||A3100-002|
|Rhopoint ID-L||3 x 2mm distance spacers #||A3100-001|