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PDA.C 02 Module PEA Print Evenness Analyzer |
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Ultrasonic Tester for Prediction of Print Unevenness/Print Mottle of paper/board via Multi-Sensor Measurements of the Wetting and Absorption Behavior of Liquids
- Gathering of the profile / the distribution of printing process relevant surface parameters of paper/board like binder, pores, pigments, surface sizing by measuring the interaction between testing liquid and paper using a novel sensor
- Main applications:
- Prediction and determination of the reasons of print mottle with
- coating base paper/board
- printing paper/board uncoated
- paper/board coated
- Research & Development
- Quality Assurance
- Troubleshooting
- Main user:
- Producer of paper/board
- Converter of paper/board
- Chemical supplier
- Machine building
- General application recommendation: Comparison of similar products, for the proof of changes in quality within one grade or a trial with one changed parameter, mainly of coating base paper / board
| Features: |
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R&D: efficient product design & optimization
Troubleshooting: fast and efficient determination of the reasons for production malfunctions (back trap mottle, water interference mottle, coating base paper investigations)
QA: avoidance of rejects as measured values are available immediately after production of a reel
Assessment of formation, in particular with board
Assessment of two-sidedness, filming degree / latex distribution in the coating
Reduce or replace requirement of test prints and image analysis
Absolute measuring results
Fast available results
Creation of an user specific mottle scale
Automatically calculated results, based on a correlation analysis: PEA Mottle-Rating
High statistical certainty by multi measurements and implementation of statistical methods
Measuring duration: preferably approx. 8 up to max 15 secs. (depending on aim)
Time requirement for a measuring series including sample preparation approx. 8 – 12 min.
Sensor: 32 pixels per 1mm², resolution: 25dpi
Average curve of 32 single curves available
Initial reading approx. 40ms after liquid contact
Volume of testing liquid: approx. 240ml
Assessment of reasons for mottle by using different testing liquids: e.g. water, fountain solution, ink jet ink, mineral oil
Widely user-independent results
Automatic self-test of the complete system prior to each measurement
User-friendly software
A single mouse click converts the analytical data to PDA format or exports it into MS Excel
Very easy to operate
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PEA application „printability“
- Assessment of the average quality by the average curve of all 32 sensor elements
- coating base paper, uncoated paper/board
- sized: surface sizing and surface porosity
- unsized: surface porosity
- coated paper/boar
- porosity
- covering, thickness of coating layer
- coat weight
- Assessment of the profile/distribution of chemical and mechanical surface parameters by evaluation of the scattering of the measuring values of each of the 32 sensor elements
- coating base paper, uncoated paper/boar
- sized: distribution of the surface sizing agent, distribution of the surface porosity
- unsized: distribution of the surface porosity
- coated paper/board
- distribution of binder/porosity/pigments
| Measuring Principle |
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A paper sample is fixed with double-sided tape at a sample holder and is brought in contact with testing liquid in a measuring cell by the PDA.C 02 Basic Device. From the moment of liquid contact, it is radiated in the Z-direction with high-frequency low-energy ultrasonic signals with a frequency of 2MHz or 1MHz optional. The attenuation of the ultrasound changes as the paper reacts with the liquid. Uneven liquid reaction/ penetration from point to point results in different signal intensities at the different sensors. This variations are gathered point-dependent by a novelly receiver with a resolution of approx. 25dpi. The Mottle Rating, the Variance, the Mottle Index M and the Structure Dimension S are calculated by a personal computer. |
PEA measurement of two unprinted coating base papers with different mottle tendency:
3D-Figure (intensity I; time t; position x) as well as Mottle Index M and Structure Dimension S |
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weak mottle
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strong mottle
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Technical Data
- Sensor: one line of 32 sensor elements, each 1mm x 1mm horizontally
- Measuring frequency: 2MHz (for paper) or 1MHz (for paper and board)
- First analytical value: approx. 40ms after liquid contact
- Amount of liquid in insert: approx. 240ml
- Testing liquids: any testing liquid of low viscosity
- Results: PEA-Rating, Variance, Index M, Formationindex F
- PC software: all common operating systems
- Test data: ASCII-File
- Operating voltage: 110V 60Hz / 220V 50Hz
- Weight: approx. 5 kg (including Basic Device approx. 20 kg)
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