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Log processing plywood production process flow

Log to log and sawn logs and cooking and rotary cutting logs skinning veneer and dry up, veneer, veneer glue group and billet hot CaiBian preloading-and to cut out and inspection gradation and packing in warehouse

Veneer, plywood production process flow

Veneer finishing-glue group and billet hot cutting, and preloading, sand and light into inspection gradation, packing in warehouse

Log sawn: imported logs length generally more than 6 meters, according to the length of the process requirement and quality sawn, interception logs should be finished product size plywood and the length of the machining allowance. Such as wide mmX2440mm 1220 the finished product plywood, usually for 2600 mm length logs or 1300 mm. The length of the log and log bending degree, the defects of the plywood directly influence the material rate, a waste have small logs, cut head and sawdust, cut through the calibration in general log 3-10%.

1. The lathe cutting veneer, plywood production is the most widely produced by the method of rotary cutting veneer, face the thickness of the general of 0.6 mm or so, core board, long the thickness of the plate general of 1.8 mm or so. This process loss is the largest, one is because no logs roundness, a considerable number of the bits of veneer can't use; 2 it is lathe cutting machine card to head on both ends of the clip prison logs generated at the end of the loss; Three is wood core loss. Veneer rotary cutting a waste for broken veneer and wood core, this shows the single wastage logs and rotary cutting material, diameter and relevant equipment performance, this part of the calibration in 15% ~ 25%.

2. Veneer dry: rotary cutting the veneer of high moisture content after, must the veneer to accord with dry agglutination process requirements. Dry wood after the dimension, called dry shrinkage. Because of moisture content is reduced, veneer the length, the width and thickness will be dry shrinkage. Dry shrinkage of the loss and the veneer of tree species and veneer moisture content and other factors, such as the veneer thickness. Dry shrinkage general calibration is 4% ~ 10%.

3. Veneer arrangement: veneer arrangement includes shear, makeup and repair. Will the belt after drying veneer, zero veneer of cutting into specifications veneer and can be joining together veneer, narrow a veneer after joining together into the whole piece veneer, flawed the whole piece veneer can repair the quality of the process to achieve the requirements. The process of the waste and the quantity produced single log material and rotary cutting quality, dry veneer veneer and operating workers on LVL quality standard familiarity with other factors, such as, the calibration is commonly 4% ~ 16%. The direct import veneer, plywood manufacturing into the process of general calibration is 2% ~ 11%.

4. Hot pressing: the glue group slab billet good through certain temperature and pressure must be firmly agglutination up. When hot-pressing temperature and moisture content of the slab with change, wood gradually be compressed, gradually reduce the slab thickness. The loss of compression loss, and plywood hot-pressing temperature, pressure, unit of hot-pressing time, tree species and other factors, such as the moisture content, the calibration is commonly 3% ~ 8%.

5. CaiBian: hot pressing good hair board cropped to specification sheet. The cutting edge horn waste and the quantity of the plywood machining allowance, wide the size, the greater the plywood wide, the smaller CaiBian calibration, are generally 6% ~ 9%.

6. Sand light: the plywood surface sanding, make the board face is bright and clean and beautiful. This process is a waste of sand light powder, veneer of good quality, sanding quantity was small, light sand wear ratio.in general is 2% ~ 6%.

In material under normal operation of production plywood calibration of log in commonly 47% ~ 55%, the direct import semi-finished products processing production plywood veneer wear ratio.in general in 16% ~ 26%.