AB Lorentzen & Wettre Kağıt Parlaklık - Opasite - Renk Test Cihazı

Kağıt Parlaklık - Opasite - Renk Test Cihazı

Elrepho is the paper industry's own spectrophotometer. It measures colour, brightness, opacity and whiteness of paper, paperboard, pulp, coating inks and fillers. The measurement conforms to all established standards for optical measurements, i.e. SCAN, DIN, ISO, TAPPI, CPPA and AFNOR. Important details such as cut-off filters and measurement aperture also comply with ISO 2469. The instrument is simple to operate with measurement table, and easy-to-use software.

L&W Colour-Brightness software, is optimized for shift testing and has complete user interfaces for identification, measurement, and reporting. Grades with limit values and target values can be set as required. The software reports most optical characteristics. Calculations can also be implemented to meet the user’s needs.


Traceable calibration

Elrepho comes with traceable calibration in accordance with the ISO’s hierarchy for photometric calibration and UV calibration at level C and D65. Working standards and a delivery certificate are included.

The software has an easy function for checking the calibration, or making a new calibration, when necessary. A large number of reference and working standards, with target values can be stored.

Fast and easy handling of samples

Elrepho is designed to make laboratory work easier. A sample is placed on the measurement table, and then automatically positioned against the instrument’s measurement aperture. For opacity measurements, the black cavity is controlled automatically. In fact, the measurement software controls everything.

Simple measurement sequences

The software automatically measures according to the conditions specified by the user, e.g. D65 illuminant, C illuminant, or a 420 nm cut-off filter. All at the touch of a button.

Measurement results can be copied to other programs by a simple copy and paste function. Alternatively, data can be saved in an Excel-compatible file. Sample identities can be retrieved from (and measurement results sent to) other databases using standard commands and tools.

Graphic presentations

The program features a number of ways to display the results graphically. The trend diagram is used to monitor the production over a longer period, while the L*a*b* plot shows the colour coordinates for a series of samples. The reflectance curve provides important information about colour dyeing and the fluorescence of the sample.

Measures effective residual ink concentration, ”ERIC”, of recycled pulp and paper

The measurement is made on a sheet and opaque pad according to the ISO 22 754 and TAPPI T 567 standards respectively. This measurement can alternatively be made on an opaque pad only. This latter method is not standardized. An alternative is to measure the ink elimination between two process stages with the INGEDE method.

A complete system

The delivery includes Elrepho spectrophotometer, L&W Colour-Brightness software, PC, printer and the accessories necessary for checking the calibration. Elrepho comes in a standard version with a measurement table for fast sample handling, but can also be supplied without the measurement table.

  • Optimized measurement program for routine testing
  • Reliable measurement even on small surfaces
  • One calibration for all filter conditions
  • Fast measurement sequences with different UV settings
  • Residual ink evaluation
  • Measures Whiteness and Brightness at D65 and C illuminant

Elrepho – Code 071 (with measurement table), Code 071E (with measurement table, with ERIC)
Code 070 (without measurement table, without ERIC), Code 070E (without measurement table, with ERIC)
 L&W Colour-Brightness software, PC, laser printer, working standards, apertures, black cavity, cables
Same as above, without PC/printer


Photometric range
0–200 %
< 0.01 ΔE CIELAB units on white ceramic tiles
< 0.25 ΔE CIELAB units (average) on NCS colour samples


Spectral range
360–700 nm
Reporting range
400–700 nm adjustable to 360–700 nm
Measurement geometry
d/0º, according to ISO 2469
Measuring principle
SP 2000 dual-beam monochromator with 2 × 256 diodes in 2 nm intervals
Standard 34 mm. Alternatively 9 mm or 6.6 mm. Automatic focus on the test area with 30 mm, 5 mm or 2.5 mm diameter. Optional 18 mm aperture with 16 mm test area diameter
10 nm
Light source
Pulsed xenon lamp, D 65 – filtered
Measurement time
4–20 s, depending on the type of measurement
395 nm and 420 nm (UV cut-off), automatically selected from the program
UV level
D65 and C, automatically controlled from the program after calibration


Operating system
Microsoft Windows
User program
L&W Colour-Brightness measurement program specially developed for Elrepho
Overview, control, identification, measurement, reporting, data output
Help functions
Calibration, calibration control, grade settings, calculated properties
D65/10°, C/2°, A/10°, D50/2°, T11/10°
Commands for photometric and UV calibration. Calibrations and working standards with target values can be stored
Data output
L&W Autoline and Excel-compatible
Tabular reports
 Test report
Graphical reports
Reflectance factor, opacity, scattering, absorption, trend, L*-a*-b*
X, Y, Z, L*, a*, b*, x, y, Rx, Ry, Rz, CIE Whiteness/Tint-D65 resp. C, Fluorescence, ISO Brightness, D65-Brightness, Yellowness, Opacity, Transparency, K/N-value, IE, Residual ink, DW, pe, s, k, sR457, kR457, Metamerism, ΔE and others
1.2 GHz or higher, Windows operating system, 2000, XP or later version, 17-in screen, serial port
 Laser or ink-jet printer

Installation requirements

400 W
Instrument air
> 0,5 MPa  (70 psi) (not 070)
Air consumption
0,2 m³/h (0.1 ft³/min) NTP (not 070)




0.4 × 0.5 × 0.6 m
16 × 20 × 24  in

0.4 m³
14 ft³
0.3 × 0.3 × 0.3 m
12 × 12 × 12  in

0.2 m³
7 ft³
0.6 × 0.6 × 0.5 m
24 × 24 × 20 in

0.4 m³
14 ft³

Net weight
26 kg
57 lb
Gross weight
50 kg
110 lb
41 kg
90 lb

61 kg
134 lb


Applicable standards
PAPTAC E1, E2, DIN 53 145/53 146/53 147/54 500, ISO 2469/2470/2471/5631/9416/11475/11476/22754/22891/, SCAN G5/P3/P8/P66/P71/P 72, TAPPI T 519/525/527/560/567

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