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Shandong Alva Machinery Co., Ltd. has focused on the woodworking machinery field for 30 years. Adhering to the corporate tenet of "Creating value for customers and benefits for partners", the company takes "Product quality is produced, not inspected" as its core business philosophy. Every product undergoes research and development, practical application and strict quality inspection.
With reliable quality, its products have passed multiple international authoritative certifications including CE and SGS, and are sold well in both domestic and foreign markets. They not only occupy a significant position in the domestic woodworking machinery sector, but also successfully completed the installation and commissioning of veneer peeling machine production lines in Vietnam and other regions, helping local enterprises enhance their production capacity and market competitiveness.
Meanwhile, the company has established a comprehensive service system, providing services such as overseas equipment installation and commissioning, operator training, and 24-hour online consultation. Both the whole machine and key components are covered by warranty, with the after-sales team responding within 48 hours. In addition, the company offers product customization and personalized packaging services to fully meet the needs of customers at home and abroad.
The vertical plywood board joining machine is specifically tailored for large-scale plywood production scenarios, with a core focus on the vertical veneer joining process. It precisely and efficiently joins short-cut veneers along the natural grain direction of the veneers (i.e., the vertical dimension).
Targeting the short-format plywood core veneers and face veneers—characterized by scattered specifications and insufficient length—generated during the production process, the machine integrates automated edge alignment, precise gluing, and high-pressure bonding into a unified process. This enables the stable joining of these materials into long-format boards with uniform length and compliant dimensions, fundamentally addressing the industry pain points of low utilization rate of short-cut veneers and poor efficiency of manual joining.
Boasting a wide range of applicability, the machine is fully compatible with the automated production line requirements of various plywood products, including three-ply boards, multi-ply plywood, LVL (Laminated Veneer Lumber), solid wood flooring substrates, construction engineering film-faced plywood, and container-specific plywood. It not only connects with upstream processes such as veneer peeling and drying but also provides standardized substrates for downstream processes like pressing, sanding, and cutting. As one of the core key equipment in the integrated plywood production line, it facilitates the resource utilization of short-cut materials, enhances production efficiency, and ensures the dimensional consistency of products, thereby providing solid technical support for enterprises' large-scale and standardized production.
This stage ensures that raw materials and equipment meet standards, covering 3 core links:
Select core veneers/face veneers that have undergone peeling and drying processes. Control the moisture content at 8%-12% and the thickness deviation within ±0.2mm. Remove defects such as knots and cracks, and classify short-cut veneers by length (minimum length ≥ 300mm) to avoid joining failures.
Set parameters via PLC according to board size, veneer material and adhesive type: ① Joining speed: 30-35m/min (adjustable to higher for softwood); ② Glue application amount: 150-200g/㎡; ③ Vertical pressure: 40-50T, lateral pressure: 70-75T; ④ Fixed-length cutting error: within ±0.5mm. Inspect the servo system, photoelectric positioning and safety components to ensure stable equipment operation.
Prepare adhesives and auxiliary materials: Preheat PUR hot-melt adhesive to 120-150℃ and maintain a constant temperature; for rope joining process, pre-install the joining rope and adjust tension to be uniform. Prepare auxiliary tools such as material receiving racks, and clean up debris at the equipment's feeding and discharging ports.
The equipment automatically completes the vertical joining of short-cut veneers, including 5 consecutive processes:
Short-cut veneers are fed through the conveyor belt. Photoelectric sensors detect and position the veneers, and the servo mechanism aligns them accurately to ensure the veneer grain is consistent in the vertical direction. The butt joint error of adjacent veneers is within ±0.3mm, eliminating edge misalignment and overlapping.
Veneers enter the gluing station, where adhesive is applied by rolling or spraying (the glue layer fully covers the veneer thickness). High-end equipment can polish the joining end surfaces to remove burrs and improve bonding degree.
Glued veneers enter the pressing mechanism, where bidirectional pressure (40-50T vertical pressure, 70-75T lateral pressure) is applied and maintained for 5-8 seconds. Excess adhesive is discharged through the guide groove. For the rope joining process, the joining rope is embedded and fixed simultaneously to enhance the tensile strength of the joint.
The equipment feeds and joins veneers continuously to form full-width long boards. The photoelectric system monitors precision in real time, and the PLC dynamically adjusts parameters to ensure the straightness error of the entire board is within 0.8mm/m.
When the board reaches the set length, the built-in saw blade/cutter performs precision cutting (with burr-free cut surface). The board is separated via the discharge conveyor belt and enters the next process.
This stage ensures finished product quality and connects with subsequent processes, covering 3 key steps:
Cut boards are cooled to room temperature on the cooling conveyor belt or in the static area (10-15 minutes required for hot-melt adhesive) to ensure complete curing of the adhesive layer. Avoid stacking and squeezing during cooling to prevent deformation.
Core quality inspection indicators: ① Glue joint: no gaps, no adhesive overflow, no cracking, width ≤ 0.2mm; ② Dimensional error: in compliance with requirements, flatness ≤ 0.7mm; ③ Surface quality: no damage, consistent grain. Minor defects shall be handled promptly, while serious defects shall be marked and returned for reprocessing.
Qualified boards are stacked by specification (stack height ≤ 1.5m) and stored in a well-ventilated and dry environment. They are transferred to subsequent processes such as pressing and sanding according to the production plan to enter the finished plywood production stage.
After the production task is completed, turn off the equipment power supply and adhesive circuit system, and clean up residual adhesive and debris. Inspect vulnerable parts such as saw blades and glue rollers, and replace or lubricate them as needed. Record production data such as output and qualification rate for subsequent production optimization.
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