Hand-applied veneer glue tips are very particular
The use of natural veneer is now more and more extensive, and the quality of wood products is inseparable from the skinning process. If the method of skinning is improper, not only will valuable wood material be wasted, but the quality of wooden products will be greatly reduced. Therefore, the use of hand-applied veneer glue is very particular, the following small series will be introduced.
1. For 0.6-1.0mm wood flakes, the hand veneer glue should be coated with 100~130g/m2. When the veneer sheet is thicker, the higher the amount of cloth is applied, and it is most suitable when there is only a little bit of glue. When the glue is too small, the glue is easy to be used and the dry glue is easy to remove the glue; if too much glue, the glue is contaminated and the surface is not easy to achieve a good coating effect.
2, assembly time: 25 ° C completed the pressurization within 10 minutes.
3, hot pressing temperature: multi-stage hot press with 105~110 °C, single-layer rapid hot press with 120~125 °C
4. Hot pressing time: when the wood flakes are 0.8mm thick, the multi-stage hot press uses 3 minutes to 4.5 minutes, the wood flakes are 0.65mm thick, and the multi-stage hot press uses 3 minutes to 4 minutes.
5. Hot pressing pressure: 8~12kgs/cm2. Generally 10kgs/cm2 is used. Adjust according to tree species: 7~8kgs/Cm2 for pine, 10~12kgs/Cm2 for hardwood Oak, Cherry, Ash, etc., 12~15kgs for trees with thick and thin thickness such as super hardwood and Mapa burl, Ash burl. Cm2
6. In winter, please raise the temperature by 50C and extend the heating time by 10~30 seconds. Immediately after decompression, the peeling test should be carried out, and it is necessary to have a broken wood to determine the hardening of the adhesive. Multi-oil wood flakes such as pine should be lowered to a temperature of 90-100 ° C. Because pine is generally 1 to 1.2 mm thick and thicker, the hot pressing temperature is lower, so the hot pressing time needs to be extended.
7. Wood moisture content (before hot pressing): Oak and Ash are 6~10%, Cherry and Pecan, walnut, and spades are 6~8%, and the moisture content of fiberboard and plywood is 6~8. % is optimal. High or low moisture levels often result in poor gluing,
8. The thickness error of wood flakes is within 0.1mm, and the difference of sanding thickness of PB and FB plates should be within 0.15mm. If the above standard is exceeded, the defect rate will increase greatly. Adhesive paper avoids overlap, up to 2 layers, 3 layers of adhesive tape will make the water in Veneer rise too high, and too thick will also lead to too much pressure and insufficient heat transfer, so that the glue can not harden completely, which is caused by cracking of veneer splicing line. Or the main reason for floating.