AB Lorentzen & Wettre Paper Gloss Tester

L&W Gloss Tester

A high precision, easy-to-use gloss tester

Gloss is an important property in the production of paper of high print quality. A paper with high gloss gives good print quality and contrast, but too high paper gloss can reduce readability because of reflection. To achieve a good compromise the paper’s gloss must be optimized.

Lorentzen & Wettre’s gloss tester is designed to stringent requirements for usability and accuracy. Therefore, all check and calibration standards are installed in a single extensible compartment in the instrument’s measurement table. This protects the standards when they are not in use, and allows easy access when checks and calibration need to be performed. L&W Gloss Tester has an automatic calibration function to set a zero reference point and a full scale. No knobs need to be turned to adjust levels. The instrument’s stability can be monitored easily with the help of check standards. The calibration and check are documented on the printer.

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Customizing values

Gloss testers from different manufacturers often have slight differences in linearity. L&W Gloss Tester therefore has built-in functions for adjusting the linearity to comply with other instruments. The zero reference point and amplification can be set so that the measurement results agree with those of an existing instrument.

Adjustable start functions

The measurement begins automatically when a sample is placed in the measuring gap. Alternatively, the measurement can be started with a foot switch or by pressing a button.

Inspection opening for sample adjustments

The sample is lifted against the measurement aperture by a measuring plate. This plate has a suction ring that holds the sample flat. The suction plate is moveable so that it is always in the same position relative to the measurement system. This guarantees good repeatability of measurements. Each measurement takes approximately four seconds.

The sample’s position can be assessed easily via the inspection hatch. If required, the position can be accurately adjusted. In that way, selected spots on the sample can be measured precisely.
The halogen lamp in L&W Gloss Tester has a long life, and only needs to be changed about every six months. Changing the lamp is simple as the measurement system can be loosened and removed. Specific accessories make fitting of the new lamp easy.

Specifications
  • Precise measurements
  • Automatic start of measurement
  • Automatic control and calibration
  • Customizing to other gloss testers
  • Suction plate with firm holding of sample
  • Inspection hatch for sample adjustments
  • Easy to replace lamp
Specification

L&W Gloss Tester – Code 224
Inclusive
Calibration standard, working standard and black cavity. PC software for setup and calibration. Accessory case. Foot switch Cable for connection to an external PC. Printer rolls


Measurement

Range
0–100 Gloss Units (GU) alt. 0–100 %


Instrument

Display and printer
5 digits, up to 4 significant digits reported
Measuring time
4 s
Light source
Halogen lamp


Results


 Measurement values
- Gloss for selected measurement geometry
Statistics
- mean value
- standard deviation
- coefficient of variation
- maximum and minimum values of the series



Connections

Data

RS232C
- connectable to L&W Autoline Data Acquisition Workstation

Printer
Parallel


Installation requirements

Power
70 W
Instrument air
>0.4 MPa (60 psi)
Air consumption
 3.6 m³/h 1.8 ft³/min NTP (during 4 s per measurement only)

 

Size

Dimensions

0.5 × 0.4 × 0.4 m
20 × 16 × 16 in

Volume

0.4 m³
15 ft³





Net weight

23 kg
51 lb

Gross weight

43 kg
95 lb

 Standards

Measurement geometry
TAPPI 75°, TAPPI 20°

Applicable standards
PAPTAC E.3P, ISO 8254-1, ISO 8254-3, TAPPI T 480,TAPPI T 653  

 

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