Plywood QC Inspection Checklist : Part 39 Core quality
The poplar core veneer is made & sold by thousands of veneer mills scattered through the poplar growing region – the plywood mills do not peel this veneer themselves. This veneer is bought by the plywood mills as grade #1, #2 & #3. Simply put, the #1 highest) grade has larger pieces with fewer defects and #3 (lowest) grade has smaller pieces with greater defect. The obvious esult of using lower grade core veneer is a greater number of core voids. The second (and less obvious) result is that the smaller pieces of veneer will not go through the rolling dryer. I have seen many mills sorting the veneer by size and mixing veneer in their core lay-up process: large pieces dried in the dryer with smaller pieces that are just air dried. This will result in a panel with ide variation in moisture content – the worst possible scenario.如无特殊说明，文章均为本站原创，转载请注明出处。If there are no special instructions, the articles are original, if you want to use or reproduce, please indicate the original source www.plywoodinspection.com,If you find that our articles infringe on your copyrights and interests, please email us at firstname.lastname@example.org in time and we will delete it at the first time.