Results showed that for the blends with 20 wt% POE, three distinct phase morphologies, that is, droplet, short fibril, and lamella
, were obtained along the extruder with both shear mixing and chaotic mixing.
To quantify thickness in both sides of the lamella, the measurements would be carried out with four laser displacement sensor heads installed close to the lamella edges, and with both pairs positioned opposite to each other.
A special computer program has been created for determination of lamella dimensional usability using LabView software.
The only duty of the operator is to set the nominal lamella thickness and the acceptable thickness deviation range.
Deviations from the basic lamella thickness have been chosen as a sawing quality indicator.
In spite of some important limitations of the contact method (tactile manner, pressure to the measured surface, sensitivity to surface peaks, and limitation of penetration of the surface walleyes), profiles scrutinized by using this sensor were considered to be the reference lamella thickness.
Non-tactile lamella thickness measurements were carried out at Shimane University (Japan) using the CCD (charge coupled device) laser displacement sensors LK-010 produced by Keyence.
It should be noticed that some differences of the thickness measured by the laser sensors and contacting gauge might be caused by the fact that measurements could not be taken on exactly the same paths but just in approximately the same locations (20 mm from the lamella edges).
The approach is to determine the main line that corresponds to the thickness profile of the lamella by double filtering.
The lamella fitted the thickness tolerances even if the signal was not filtered, due to minimal signal variation affected by the lack of large vessels occurring in the beech wood.