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Measurement of the Weight per-Unit-Area Distribution of the Mat, Before the Hot Press

The forming section for MDF & PB does not always distribute the fibers uniformly. Normally, there is some fluctuation in the weight per-unit-area across the mat. The reasons for this vary based on wood species and technical limits of the machinery. Consequences of the fluctuation are increased press time, overweight, and/or lack of quality. Minimum press time results from the mat location with highest weight per-unit-area; plus tolerances direct to unwanted, long press time. A traversing weight per-unit-area gauge controls the mat across the mat width and given that data information, it is possible to maintain small forming tolerances and prevent over dimensioning. 

During the start phase of a production line, it can be helpful to see the weight profile, lengthwise of the forming. The movement of the measuring head across the mat can be stopped any time, in any position, over the mat.

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Function:

  • MASS-SCAN X measures the weight per-unit-area of a fiber mat, crosswise and lengthwise to the production direction.

Benefits:

  • Forming and hot press can be optimized
  • Reduction of energy, resin, and material consumption
  • Prevention of sideways belt movement
  • Reduction of sanding
  • Quality assurance

Installation Location:

  • After forming station, before hot press
  • On finished board, after the press

Safety:

  • In accordance with the German protection and safety regulations for x-ray systems.

Computer System:

  • 19"-rack industry computer
  • Wide range of power supply
  • Operating system:  Windows XP
  • Hard disc in exchangeable frame
  • Server hard disc (24 h operation)
  • RAID controller for backup (Copying to a second hard disc)
  • Ethernet LAN
  • Monitor TFT 19"
  • Color printer

 

Technical Data:

Technology:

X-ray

Anode current:

< 1mA

High voltage:

< 32 kV

Cooling:

Electrical cooling by Peltier element

Control:

Smooth run up of x-ray tube over 45 s

Life time of
x-ray tube:

Approx. 5 years

Measuring range:

up to 40 kg/m² (standard)

Traversing:

250 mm/s (adjustable)
Stoppable at any position across the mat

Drive:

Adjustable gear motor

Guides:

Tooth belt, linear bearings (insensitive to dust)

Cable:

Elastic trailing cables

Calibration:

On sample outside of belt conveyor, several calibrations can be stored

Accuracy:

+/- 0.25% of range

Compressed air:

> 4 bar

 

Analysis:

  • Actual cross profile
  • Long term cross profile
  • Length profile
  • 3-D representation
  • Trends
  • History file

Options:

  • Interruption free power supply for PC