Blow Detection Systems

PLY-SCAN Mark 1, BLOW-SCAN Mark 1, CONTI-SOUND Mark 1

for Plywood, Particleboard and OSB

Data sheet: New Blow Detection Systems | PDF (112 KB)

automatically detect blows, blisters, areas with no bond and air pockets during production of wood panel boards. They transmit ultrasonic sound which is unhearable to humans and which constantly penetrate the boards. The number of inspection channels can be chosen to specify the inspection density. EWS blow detection systems can operate in the harsh environment of a panel board production, i.e. under dust, steam and high temperature.

Every Type of Panel Board is different.
This is the same as with the requirements of a production. Blows, blisters, areas with no bond, air pockets are always unwanted. Today it is not a technical problem to detect these production defects automatically by using ultrasonic measuring technology.
The today’s technical competition of the measurement suppliers is seeking to customize the blow detection systems to the individual products. For plywood production the system can be limited to blow/no blow detection. This is not enough information for blow detection in particleboard -, MDF- and OSB- production lines. Here it is required to detect changes of the panel properties and to supply early warning functions before blows / blisters occur. With a new generation of blow detection systems PLY-SCAN, BLOW-SCAN and CONTI-SOUND Electronic Wood Systems is at the front of this technical development.

An outstanding feature of all three systems is, that they flash into automatic calibration in between the panel gaps by using a no-load calibration method. Influences generated by dust coating on the sensors are compensated automatically.
Thereby movable and expensive support frame constructions are not necessary anymore.

PLY-SCAN
As a consequence of too high or too low moisture content of the veneers or in case of inadequate glue process blows or no bond areas can occur. These production failures can be definite detected and shown by PLY-SCAN. The system provides “blow/no blow” functions, is reasonable priced and is easy to operate.

BLOW-SCAN
preferably will be installed in particleboard-, MDF- and OSB- production lines.
In addition to reliable blow detection a multi-color sound picture will be shown on a monitor and the average value of sound penetration will be shown in a graph. So, the measurement can be used as early warning system. Changes of the panel properties can be shown.

CONTI-SOUND
provides extended evaluations of the sound signals. Additional sound receiver will be used to measure the reflection of the sound at the panel surface. This especially is helpful to supervise continuous production processes. In addition to the average sound value the minimum and maximum values will be analyzed and shown. This also improves the early warning function.

CONTI-SOUND Early Warning System equipped with additional reflection receivers (red)

Technical Data

Technology:	ultra sound
No. of inspection channels:	max. 22
Channel space:	min. 100 mm
Detectable blow size:	Ø 50mm
Thickness of panel:	max. 45mm
Density of panel:	>550kg/m³

Remote control, online support

Visualization (PiperWare)

Location of blow
Multi-color sound picture (except in PLY-SCAN)
Trend / history function

Specific Features

Automatic online-calibration
Benefit: replaces movable frame construction
Automatic alignment of sensor sensitivity
Benefit: replaces calibration plate slices
Automatic detection and compensation of dust contamination on sensors
GAUGE-CONTROLLER
Real time system
Benefit: high systems stability,
„Open-Source“ system does not require software license
high production velocity allowed (3m/s)
Measurement and visualization autarkic
At site interface for service purpose
Benefit: Configuration of system directly at measurement systems location possible
Automatic compensation of temperature drifts
Benefit: Improvement of measurement accuracy

Optional

Interfacing of process control system and PLC
Color marking (edge- or channel-)
ATEX zone 22

Remarks:
For blow detection in very thick panels (>45 to 200mm) or of very low density panels (<550kg/m³) the well-proven EWS System ULTRA-SCAN can be used.
(see separate leaflet)