Core Advantages:
Super High Efficiency: The 26-opening design allows for simultaneous pressing of multiple mats. Combined with rapid pressing, heating, and pressure release technology, the hot pressing cycle is reduced by over 26% compared to traditional equipment,significant increase in daily production volume.
Excellent Energy Saving: Utilizes thermal oil circulation systems, high-efficiency insulation panels, and heat recovery technology, significantly reducing energy consumption per unit product and lowering operating costs.
Fully Automatic Operation: Equipped with a PLC central control system and automatic loaders/unloaders, enabling full automation from layup, feeding, and hot pressing to unloading. Reduces labor dependency and ensures production safety and stable rhythm.
Top-Tier Quality: Multi-opening hot press technology ensures even heat distribution and consistent pressure on both sides of each plywood sheet. Products feature high density, stable structure, excellent bond strength, and minimal thickness tolerance.
Robust and Durable: The main press frame is constructed from high-strength alloy steel. Key components are from internationally renowned brands, ensuring long-term stable operation in high-temperature and high-pressure environments with low failure rates and a long service life.
Machinery
| | Phase 1: Log Handling Section |
This section aims to process raw logs into blocks suitable for peeling.
1. Log Debarker: Removes bark, commonly using efficient ring debarkers.
2. Log Cross-Cut Saw: Cuts long logs into fixed-length blocks according to process requirements (e.g., multiples of 4 or 8 feet).
3. Log/Block Conveying System: Includes rollers, chain conveyors, etc., connecting various equipment to achieve automated flow.
Log Debarker
Log Cross-Cut Saw
| | Phase 2: Veneer Preparation Section |
This is the core "raw material preparation"link of the production line.
1. Log Vat / Hot Water Pond: Softens log blocks to facilitate high-quality peeling.
2. Veneer Lathe / Peeler: Peels log blocks into continuous veneer ribbons; its precision determines veneer quality.
3. Veneer Clipper: Cuts continuous veneer ribbons into veneer sheets of required width and length, and can be connected to CCD cameras for automatic defect recognition and cutting.
4. Veneer Dryer: Usually a large-scale roller dryer that reduces the moisture content of wet veneer to 8%-12%.
5. Veneer Stacking & Grading Station: Dried veneer is automatically stacked and graded (A, B, C grades) manually or by machine vision systems to distinguish face, back, and core veneers.
Veneer Lathe
Veneer Dryer
Veneer Stacking
| | Phase 3: Gluing & Layup Section |
This is the key to achieving full automation and directly determines production line efficiency.
1. Automatic Glue Spreader: Applies adhesive evenly to both sides of the core veneers.
2. Automatic Layup Line: This is essential high-tech equipment for a 26-opening line, typically including:
Face/Back Veneer Feeder: Automatically picks and places A-grade face and back veneers.
Core Veneer Feeder: Automatically places glued core veneers layer by layer.
Layup Robot/Automatic Layup Station: Precisely assembles face, core, and back veneers into mats according to set layer count and grain direction.
Pre-press: Applies cold pressure to the assembled mats, giving them initial shape for easier loader handling and reducing hot pressing time.
Glue Spreader
Pre-press
| | Phase 4: Hot Pressing Section |
This is the absolute core of the entire production line. The 26-opening hot press is the highest-value equipment.
1. 26 Opening Rapid Hot Press:
Structure: Massive steel frame, 26 press platens, driven by large hydraulic cylinders.
"Rapid" Embodiment: Uses a high-flow hydraulic system for fast closing and opening; uses a thermal oil heating system to provide a stable and efficient heat source with rapid temperature rise; advanced simultaneous closing system ensures even pressure on all mat layers, further shortening the cycle.
Intelligent Control: PLC precisely controls the temperature, pressure, and time curve for each platen.
2. Automatic Loading & Unloading System:
Loader: Precisely feeds pre-pressed mats into each opening of the 26-opening hot press.
Unloader: Automatically removes the finished panels from each opening after hot pressing is complete.
This is necessary equipment for achieving continuous, efficient production and is essential for matching the 26-opening hot press.
26 Opening Rapid Hot Press
Automatic Loading System
| | Phase 5: Finishing Section |
Processes the rough panels after hot pressing into finished products.
1. Cooling Rack: Allows high-temperature panels to cool naturally, releasing stress and preventing deformation.
2. Double-End Trimming Saw: Saws irregular edges to standard dimensions (e.g., 4'x8').
3. Calibrating Sander: Sands the panel surface to ensure uniform thickness and a smooth finish.
4. Stacking & Packaging Equipment: Automatically stacks, counts, and packages finished products.
Double-End Trimming Saw
Calibrating Sander
| | Phase 6: Auxiliary Systems |
Support systems that ensure the efficient and environmentally friendly operation of the entire line.
1. Glue Kitchen & Supply System: Automatically prepares, mixes, and supplies adhesive.
2. Thermal Energy Center: Provides the heat source (thermal oil/steam) for the dryer and hot press; it is the core of energy consumption.
3. Dust Collection System: Collects wood dust at various dust generation points (sawing, sanding) throughout the line to ensure environmental protection.
4. Central Electrical Control System: Based on industrial PLCs and touchscreens, it monitors and coordinates the entire production line, acting as the "brain" of the operation.
The characteristics of this production line are large-scale, automation, and high efficiency. The 26-opening hot press and its matching automatic loading/unloading system are the most significant investments, elevating production capacity to a level unattainable by traditional small-scale lines. All equipment works in coordination to form a continuous, streamlined modern plywood manufacturing plant.
Production Process
Phase 1: Log Handling
1. Debarking: The bark is removed from the logs using a debarker. Bark has too many impurities and cannot be used.
2. Cross-Cutting: Long logs are sawn into specific-length blocks (e.g., 2.6m or 5.2m for 4ft or 8ft panel lengths) based on the target product size and lathe requirements.
3. Soaking/Steaming: Log blocks are placed in a hot water vat or steam chamber to soften them. This crucial step softens the lignin, allowing the blocks to be peeled without breaking, producing continuous, smooth, high-quality veneer.
Phase 2: Veneer Production
4. Peeling: The core process. The softened block is mounted on a rotary lathe. As it rotates at high speed against a fixed long blade, it is peeled into a continuous veneer ribbon. The veneer thickness is determined by precise adjustment.
5. Clipping: The continuous veneer ribbon is cut into individual sheets according to preset specifications (width and length). Modern lines have vision systems to automatically identify and cut out defective parts like knots and splits.
6. Drying: Freshly peeled veneer has very high moisture content (often >60%) and must be dried. Veneer passes through a large roller dryer where hot air reduces its moisture content to the standard range of 8%-12% to meet gluing requirements and prevent warping or cracking.
Phase 3: Veneer Processing & Gluing
7. Grading & Patching: Dried veneer is graded manually or automatically based on appearance (knots, color, defects) into different grades for face, back, and core plies. High-grade veneer (for faces) may be patched to fill small defects.
8. Gluing/Spreading: The graded core veneers (and sometimes back veneers) pass through a glue spreader, which applies a uniform, specific amount of adhesive (e.g., Urea-Formaldehyde UF, Phenol-Formaldehyde PF) to both surfaces.
Phase 4: Layup & Hot Pressing
9. Layup/Assembling: Following the designed number of piles (usually odd, like 3-ply, 5-ply, 7-ply) and grain direction (adjacent layers perpendicular), the glued core veneers and unglued face/back veneers are assembled into a "mat." Fully automatic lines use a layup machine for high efficiency.
10. Pre-pressing: The assembled mat undergoes cold pressing (pre-pressing) to achieve initial bonding, making it easier to handle and reducing internal air for better hot pressing efficiency and quality.
11. Hot Pressing: The most critical forming process. The mat is loaded into a multi-opening hot press. Under high temperature (126-180°C) and high pressure (100-200 kg/cm²) for a set time, the heat cures the adhesive, and the pressure permanently bonds the multiple veneer layers into a solid plywood panel.
Phase 5: Finishing & Packaging
12. Cooling: Panels exiting the press are very hot. They are cooled on racks to release internal stress and stabilize the structure, preventing deformation.
13. Trimming: A double-end trimming saw cuts off the irregular edges of the pressed panels to achieve precise standard dimensions (e.g., 1220mm x 2440mm).
14. Sanding: Large calibrating sanders sand the top and bottom surfaces to remove the pre-cured layer, thickness deviation, and minor flaws, resulting in a final product with uniform thickness and a smooth, flat surface.
15. Grading & Inspection: Finished panels are inspected and graded according to national (e.g., GB/T 9846) or international standards based on appearance and physical properties (e.g., Premium, Grade I, Grade II).
16. Packaging & Storage: Finally, graded panels are stacked, bundled, labeled, and then stored in the warehouse or shipped directly.
26-Opening Rapid Hot Press
| | I. Product Overview |
The 26-opening rapid hot press is the core host equipment in modern, large-scale plywood production lines. It is a large hydraulic forming machine used to press glued wood veneer mats into solid plywood under high temperature and pressure. "26-opening" refers to its up to 26 platen intervals, allowing for the simultaneous pressing of 26 mats, which is key to large-scale, high-efficiency production. "Rapid" embodies the advanced technology in fast opening/closing, rapid pressure application/release, and efficient heat transfer, significantly shortening the single pressing cycle and thereby extremely increasing daily output.
| | II. Core Structure & Components |
1. Main Frame: A "window-type" or frame structure welded from high-strength alloy steel plates, ensuring extreme stability, rigidity, and fatigue resistance under long-term high-temperature and high-pressure conditions, preventing deformation.
2. Hydraulic System: The power source for "rapid". Comprises high-flow high-pressure oil pumps, precision hydraulic valves, large main cylinders, and accumulators. It provides and precisely controls the enormous pressure required (total pressure can reach thousands of tons). High-flow pumps and accumulators ensure the rapid ascent and descent of the press platen.
3. Hot Plates & Heating System:
Hot Plates: 31 massive (e.g., 4'x16') high-strength steel plates, precision-ground for flatness. Each has complex internal flow channels.
Heating System: Typically uses closed-cycle thermal oil heating. Heat transfer oil is heated in a thermal energy center and pumped through the channels in each hot plate, transferring heat evenly to the mats. This method is more stable, controllable, and efficient than steam heating.
4. Simultaneous Closing System: A key technology for multi-opening presses. It uses a set of precise linkage mechanisms to ensure all 26 platens close simultaneously and evenly during molding, guaranteeing consistent pressed thickness for each mat and avoiding equipment damage due to uneven force.
5. Automatic Loading & Unloading System: Essential equipment paired with the 26-opening press, forming a high-efficiency unit.
Loader: Feeds pre-pressed mats accurately into each opening.
Unloader: Automatically removes the finished panels from each opening after pressing.
Its operation is perfectly synchronized with the press, enabling fully automatic continuous production.
6. Intelligent Control System: Based on PLC (Programmable Logic Controller) and HMI (Human-Machine Interface) touchscreen. Allows segmented, precise setting and control of temperature, pressure, and time for each platen. Stores pressing recipes for various products for one-touch recall. Monitors operational status, provides fault diagnosis alarms, and records production data for intelligent management.
| | III. Core Embodiment of "Rapid" & Technical Advantages |
1. Fast Opening/Closing Speed: High-flow hydraulic systems and accumulators enable the massive platen to complete ascent and descent in tens of seconds, greatly reducing non-productive time.
2. Rapid Pressure Application/Release: Advanced hydraulic control blocks and system design allow pressure to be built and released quickly, shortening the waiting time for mats under non-target pressure.
3. Efficient Heat Transfer: The closed thermal oil system provides a stable and ample heat source. The oil flows rapidly within the plates, enabling quick heating and maintaining uniform temperature (differences can be controlled within ±2-3°C), accelerating adhesive curing.
4. Short Pressing Cycle: Taking all of the above points into consideration, the 26-opening rapid hot press can reduce the average cycle time to even under 5 minutes (depending on thickness and adhesive). This means 26 panels are produced every 5 minutes, resulting in astounding daily output.
| | IV. Workflow |
1. Preparation: Loader is in position; all platens are open.
2. Loading: The loader feeds 26 pre-pressed mats into the openings successively.
3. Closing & Pressing: The press activates; the simultaneous closing system ensures fast, smooth closure of all platens. The main cylinder applies high pressure to the mats.
4. Hot Pressing & Curing: Under set temperature, pressure, and time, heat penetrates the mats, melting and curing the adhesive, permanently bonding the veneers.
5. Pressure Release & Opening: After the set time, the system releases pressure, and the platens open rapidly.
6. Unloading: The unloader moves into each opening, simultaneously removing all 26 pressed plywood panels and sending them to the cooling rack.
| | V. Main Technical Parameters |
Number of Openings: 26
Total Pressure: 2600 - 5000 Tons (or higher, customizable)
Platen Size: Customizable, e.g., 1260mm x 2600mm (4' x 8') or 1260mm x 5200mm (4' x 16')
Daylight Opening: Approx. 150 - 200 mm
Heating Method: Thermal Oil
Working Temperature: 126°C - 200°C (Adjustable)
Control System: Fully Automatic PLC + HMI Touchscreen
| | VI. Application & Importance |
Primary Application: Large-scale production of construction formwork, container flooring, concrete formwork plywood, and other products requiring high strength and high output.
Core Importance: It is the "heart" and "bottleneck" of the entire production line. Its capacity directly determines the line's output, and the quality it produces (flatness, bond strength, thickness deviation) directly determines the final product's grade and value.
1. Large-Scale Production of Construction Formwork
This is the most core and traditional application for a 26-opening line.
Scenario: Specifically for the mass production of concrete pouring formwork used in large construction projects and infrastructure (e.g., high-speed rail, bridges, hydro dams, nuclear power plants, urban commercial complexes).
Why it's Suitable:
Ultra-High Capacity: The 26-opening press can press 26 panels simultaneously. Combined with a rapid cycle time, daily output can reach thousands of panels, easily meeting the concentrated, massive demand of large projects.
Exceptional Strength: High-pressure forming ensures extremely high MOR (Modulus of Rupture) and allows for 20+ reuses.
Surface Quality: Produces a smooth, flat surface for high-quality concrete finishing.
Product Types: Various sizes (e.g., 4'x8', 4'x16') of film-faced (phenolic film) construction formwork.
2. Manufacturing of Container Flooring
Scenario: Specialized production of flooring dedicated to the bottoms of freight containers.
Why it's Suitable:
Stringent Performance Requirements: Container flooring must withstand enormous concentrated loads, impact, and harsh environments. The extreme pressure and temperature from the 26-opening press produce high-density, super-strong, corrosion-resistant flooring that fully complies with international standards (e.g., CSC).
Size Matching: The line can be adapted to produce extra-long panels (e.g., 4'x16'), perfectly matching container dimensions and minimizing waste.
Quality Consistency: Automated production ensures highly consistent physical properties for every panel, which is crucial for container standardization and safety.
3. High-End Furniture & Decorative Substrate
Scenario: Provides high-quality plywood substrate for large furniture factories, cabinet manufacturers, and interior decoration companies.
Why it's Suitable:
Excellent Flatness: Rapid hot pressing and simultaneous closing technology ensure superb flatness and minimal thickness deviation, ideal for subsequent finishing (e.g., veneering, PVC laminating, fireproof panel overlaying) and CNC machining.
Eco-Friendly & Stable: The line can use E0, E1 grade eco-friendly adhesives. The produced panels have low formaldehyde emissions and are dimensionally stable, meeting the environmental and quality demands of high-end furniture and interiors.
Bulk Supply: Can fulfill the demand for large-volume, multi-batch orders with consistent quality from major furniture brands.
4. Specialized Industrial Panels
Scenario: Production of special plywood for truck & RV trailers, refrigerated van bodies, flooring, wall panels, packaging cases, and partitions.
Why it's Suitable:
Customization Capability: The line can be adjusted (e.g., adhesive type, pressure, time) to produce panels with different properties (e.g., moisture-resistant, fire-retardant, wear-resistant).
High Strength-to-Weight Ratio: The produced panels are strong yet relatively light, meeting the dual requirements of weight reduction and load-bearing for transportation.
5. Export-Oriented Production
Scenario: Production of plywood primarily for export to international markets.
Why it's Suitable:
Complies with International Standards: The panels meet the strict entry requirements of developed markets like Europe and the US in terms of dimensions, strength, and environmental protection level (e.g., CARB, CE certification).
Cost Advantage: High automation and economies of scale reduce the per-panel production cost, providing strong price competitiveness in the global market.
Stable Supply Capacity: The huge output capacity guarantees the ability to handle continuous large-scale orders from overseas large wholesalers and building material supermarkets.
We Can Provide:
Turnkey Project Delivery
Equipment Installation & Commissioning
Operational Training for Personnel
Comprehensive After-Sales Service & Spare Parts Support
If interested please contact us for a quote.
Our contacts:
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
Shandong Minghung Wood Machinery Factory Shandong minghung wood machine factory produces plywood machinery in linyi city city, china, dedicated to providing high-quality and suitable machines veneer machine,plywood machine,veneer splicing machine.veneer dryer machine,veneer peeling machine,plywood v
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