Quality Control of Veneer Strips with Laser Triangulation Sensor

04-06-2020

Veneer Strips are thin sheets of wood of about 1mm thickness or less. They are manufactured by precisely cutting laminated woods with cutter disks to produce strips with less than 1mm thickness. They are generally used in the production of flat panels such as doors, tops, and panels, which are further utilised for assembling parts of furniture, cabinets and drawers. These sheets are obtained by slicing large rectangular blocks of wood or peeling the trunk of a tree. Thereafter, they are glued together to form layers over a thick core. After this transformation, they become highly stable and less prone to splitting and cracking as compared with solid wood.

The finished products should be thoroughly checked, for the thickness of the strips should not exceed 1mm as per industry specifications. They can only tolerate marginal error in the micrometer range. Furthermore, they are checked for any inconsistent thickness or sprinters that can cause the furniture to delaminate or peel back at edges. Therefore, a reliable sensing and detection technology is required to accurately measure the sheets’ dimensions to ensure that they meet the production standards.

Laser Triangulation as a Solution

Offering fast, wear-free measurement capability with precision, a laser triangulation sensor is widely regarded as the ideal non-contact sensor technology for measuring thickness and dimensions in industrial applications. Laser sensors generally have a compact design that can be easily integrated with industrial machinery. It is also almost independent of the surface properties due to its real-time surface compensation feature. This makes the laser sensor suitable to be integrated into cutter disks to control the quality of the veneer strips.

In this particular application, the advanced laser triangulation sensor from Micro-Epsilon, optoNCDT 2300, is used in the post-processing stage to check the quality and dimensions of wood veneer. It is done by measuring and monitoring the radial deviation of the cutting disks. The dimension of the veneer strips depends on the precision of the cutting disk used for slicing the laminated wood. The cutting disk is fitted with 24 blades and has a diameter of 3200 mm. The disk also rotates at speed of approximately 180 to 210 rpm.

Under such challenging conditions, the optoNCDT 2300 is capable of generating constant and reliable measurement results. This is due to its capability to offer high-speed measurement and cope with changing surfaces.  The protective housing keeps the laser beam entirely protected from them to cast shadows and impair the measurement. As a result, the formation of dust and chippings also has a negligible effect on the measurement accuracy. The strongly reflecting surface of the cutting disk and the high-speed operation also doesn’t affect the measurement process. This is because the sensor is integrated with a high-performing optical system to generate precise measurements at rough and challenging conditions.

The sensor can also be connected to the PC via a serial interface. This enables measurement with a direct transfer of results to the connected PC for post-processing of the measured values and signals. It also offers an intuitive, easy-to-operate web interface that allows the users to easily configure and set pre-measurement settings.

The optoNCDT 2300 laser triangulation sensor exhibits high resolution and fast-measuring capability. It is ideal for this type of measurement applications as it can offer precise measurement with sub-micrometre. To sum it up, the optoNCDT 2300 is one of the best possible solutions that are currently available for monitoring and quality control in the veneer strips production.

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