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The Production Process of Plywood
As a widely used engineered wood material for home decoration, furniture manufacturing and construction projects, plywood features low deformation, high toughness and cost-effectiveness. Different from solid wood, it is manufactured with logs through veneer peeling, cross assembly, glue coating and hot pressing. Its core manufacturing principle is cross-laminated veneer structure, which effectively solves the problems of cracking and deformation common in natural solid wood. Qualified plywood is produced via a series of standardized processes.
Commercial wood species such as poplar, eucalyptus and pine are the primary materials for plywood. Hardwood is adopted for high-strength construction plywood, while softwood is mainly used for furniture and interior decoration plywood.
Raw logs are first cut to standard lengths and debarked. Hard wood logs will be cooked and softened to improve flexibility, preventing cracking and damage during subsequent processing and ensuring raw material quality.
Veneer peeling is the fundamental core procedure of plywood production. Softened log sections are sent to a rotary peeling machine, which continuously peels logs into uniformly thin wood veneers, the basic components of plywood.
Freshly peeled wet veneers contain high moisture and are soft and fragile. Defective veneers with damage or knots are eliminated, and small-sized veneers are repaired to maximize material utilization before drying.
Wet veneers undergo constant-temperature drying to adjust moisture content to the standard range. Excessive moisture causes bubbling and delamination in finished boards, while overly dry veneers become brittle with poor adhesion, making drying critical to plywood stability.
After drying, veneers are edge-trimmed and cleaned of stains and wood chips, then graded. High-quality veneers are used for board surfaces, and standard veneers for inner cores to balance appearance and cost performance.
Qualified dried veneers are evenly coated with adhesive by automatic equipment. A full and uniform glue layer is essential for firm bonding and delamination resistance.
The coated veneers are assembled following three core rules: cross grain arrangement, symmetrical structure and odd-layer lamination. Cross-placed wood grains offset wood expansion and contraction stress, while 3-ply, 5-ply or 7-ply symmetrical structures ensure uniform stress and minimize warping and deformation.
Assembled raw board assemblies are loosely structured and require two pressing procedures. First, cold pre-pressing bonds veneers preliminarily to prevent displacement during hot pressing.
Subsequent high-temperature and high-pressure hot pressing cures the adhesive completely, bonding all veneers into an integrated solid board. High temperature also kills insect eggs and bacteria, improving the board’s moisture resistance, corrosion resistance and overall durability.
After hot pressing, boards are trimmed to standard dimensions and finely sanded to remove burrs, glue marks and surface defects, delivering smooth finished surfaces for subsequent decoration and furniture fabrication.
Sanded boards are stacked and conditioned to balance internal and external temperature and humidity, releasing internal processing stress. This effectively prevents later warping and cracking and extends the service life of plywood.
Finished plywood undergoes comprehensive quality inspection covering flatness, bonding strength, dimensional accuracy, as well as checks for bubbles and delamination. Slightly flawed boards are repaired, while unqualified products are discarded. Certified plywood is cleaned, packaged and stored in warehouses.
How is plywood layup line work in different country ,with different log ?
Product Uses
Type 1 : 8ft glue spreader + veneer conveyor | Type 2 : 4ft glue spreader + veneer conveyor | ||
Suit for short grain veneer  | Horizontal composed veneer  |  |  |
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Type3 : 4ft glue spreader + veneer paving line | Type 4 : plywood lamninated line | ||
Suit for small size veneer , as 4x4ft or 4x2ft veneer .   | This equipment is designed for re-formed plywood, which refers to plywood processed with two hot-pressing procedures.  | ||
welcome contact me ,inquiry our plywood veneer layup line price ,and lets discuss the plywood technology !
