MH
MINGHUNG
This tolerance level is far superior to that of ordinary construction formwork or standard furniture plywood (typically with tolerances above ±1.0mm). It represents a high-end, precision-grade industrial product primarily used in fields demanding extreme dimensional stability, flatness, and consistency, such as:
High-end furniture and cabinetry: Especially for system furniture using "bore-free installation" techniques, which require extremely precise panel dimensions.
Packaging cases and liners for precision instruments: Require a perfect fit for optimal protection.
Interior panels for luxury yachts and RVs: Require high lightweight properties and installation accuracy.
Substrates for laboratory countertops and cleanroom partitions: Require resistance to warping and high flatness.
Substrates for art framing and display structures: Require perfectly straight edges and flawless surfaces.
Achieving such stringent tolerances is not the result of a single machine but rather the combined effect of an entire precision production system, high-accuracy equipment, and strict quality control processes.
 | Core Components |
The entire production line can be divided into the following key sections, each of which must meet corresponding precision requirements.
1. Raw Material Preparation and Processing Section
Goal: Ensure the quality and uniform thickness of the veneers, which is the foundation for all subsequent precision.
High-Precision Lathe/Peeler:
This is the "source" of the production line. It must use servo motor or hydrostatic drive systems to ensure extremely high knife gap accuracy, controlling the thickness variation of the peeled veneer within ±0.05mm.
Equipped with laser centering systems to ensure stable concentricity during log rotation, preventing uneven veneer thickness.
The blade material and grinding precision are also crucial for achieving a smooth, tear-free cut surface.
Precision Dryer:
The final moisture content (MC) of the dried veneer must be uniform, typically targeting 8%-12%, with a variation of no more than ±1% between sheets or across different areas of the same sheet.
Utilizes multi-platen belt or roller dryers equipped with accurate temperature and humidity sensors and automated control systems. These can automatically adjust drying curves based on wood species and initial MC, preventing over-drying or under-drying, which can cause subsequent warping.
CNC Clipping and Splicing Machines:
Dried veneers are cut to size by high-precision optoelectronic scanning clippers, producing neat edges.
For narrow veneer strips, automated splicers (e.g., finger-joint splicers, stitch splicers) are used to ensure the assembled full-size veneer sheets are seamless, flat, and of consistent strength.
veneer peeling machine
veneer dryer
2. Glue Application and Layup Section
Goal: Apply adhesive in an exact, uniform amount onto the veneers and precisely align each layer.
Precision Four-Roller Glue Spreader:
While standard lines might use two-roller spreaders, a high-precision line must use a four-roller machine.
The precise interaction between the pick-up roller, meter roller, glue roller, and counter roller allows for strict control of the glue spread rate (GSR), ensuring a uniform layer without misses or pools. The GSR error needs to be controlled within ±5g/m².
Glue viscosity requires automatic monitoring and adjustment.
Automated Layup Line (Robotic Layup):
This is one of the absolute core links for achieving ±0.5mm tolerance. Manual layup cannot achieve this precision.
Robotic arms equipped with vision recognition systems accurately pick and place each glued veneer layer.
High-precision sensors and positioning systems ensure each veneer layer is strictly aligned, with the core veneers' grain direction at 90 degrees to the face/back veneers. Misalignment between layers must be less than 0.5mm.
After layup, the edges of the mat are almost perfectly flush, setting the stage for precise trimming later.
3. Hot Pressing Section
Goal: Press the mat into a panel of specified thickness and density under precisely controlled temperature, pressure, and time.
High-Precision Hot Press:
Must utilize a multi-opening hot press (or a press with numerous individual cylinders) with synchronous control. Each cylinder's pressure is controlled by an individual proportional valve. A servo control system and network of pressure sensors ensure highly uniform pressure across the entire platen surface, preventing local thickness variations due to uneven pressure.
The hot platens themselves require extremely high machining accuracy, with flatness errors less than 0.1mm, and must offer uniform heat transfer.
Press Stops (Limit Stops) System: This is key to controlling the final thickness. High-precision lines use digital thickness control systems or high-tolerance metal stops to precisely control the final distance between the platens when the press closes, directly determining the finished panel thickness. The accuracy of this system is paramount for achieving thickness tolerance.
4. Finishing and Precision Machining Section
Goal: Size, trim, and sand the pressed rough panels to achieve the final exact dimensions and surface smoothness.
Double-Dimensional (Calibrating) Sander:
This is another absolute core piece of equipment for achieving ±0.5mm tolerance. Even minor thickness variations after pressing must be corrected by sanding.
Employs a CNC-controlled dimensional sander, typically configured with multiple heads (e.g., roughing, finishing).
High-precision laser scanners at the infeed and outfeed continuously measure the thickness across the entire panel surface. This data is fed back to the sander's control system, which automatically adjusts the height of the sanding heads to "target" areas exceeding tolerance. This ensures consistent thickness across every point of the panel, meeting the target value.
This system can easily control thickness tolerance to within ±0.1mm or better.
High-Precision Cross-Cut and Rip Saw (Optimization Saw):
Utilizes a CNC sawing system driven by servo motors, precision ball screws, and linear guides.
The panel is aligned against a reference fence. The system cuts one side based on the set final dimension, then rotates the panel 90 degrees. The freshly cut edge is used as the new reference for cutting the adjacent edge, ensuring perfectly square corners and absolutely equal opposite side lengths.
Dimensional tolerance after sawing can be controlled within ±0.2mm.
sanding machine
plywood trimming saw machine
1. Intelligent Control System (The Brain): The entire line is controlled by a central PLC or industrial computer, often integrated with a MES (Manufacturing Execution System), to monitor and adjust parameters (temperature, pressure, speed, thickness, etc.) in real-time, enabling data traceability.
2. In-Line Quality Inspection (The Eyes): Laser scanners, vision cameras, moisture meters, and thickness gauges are installed at multiple critical points for 100% real-time inspection. This allows for immediate detection and rejection of non-conforming panels or provides feedback for upstream adjustment.
3. Stable Environment Control: The workshop requires a constant temperature and humidity environment (e.g., 25±2°C, 55%±5% RH). Because wood is hygroscopic, environmental fluctuations can cause dimensional changes in the panels, affecting final precision.
4. Strict Process Discipline and Quality Management System: Such as ISO 9001. From raw material intake to finished product storage, every process step has strict SOPs (Standard Operating Procedures) and inspection criteria.
| I. Core Characteristics and Advantages |
1. High Strength and Good Stability: The cross-graining (alternating grain direction of adjacent layers) counteracts wood's natural anisotropy. This gives plywood uniform strength, shrinkage, and swelling properties in all directions, making it resistant to warping and splitting.
2. Flexible Size Specifications: Compared to solid wood, plywood can be easily produced in large, wide panels to meet various application needs.
3. High Utilization Rate: It can be produced using fast-growing timber, small-diameter logs, or even wood scraps for veneer peeling, improving overall wood utilization efficiency.
4. Strong Decorative Potential: The surface can be laminated with various precious wood veneers, decorative papers, metal foils, etc., providing a wide range of decorative effects.
| II. Classification Methods |
Plywood can be classified in various ways, commonly:
By Water Resistance (Adhesive Performance): This is the most important classification, directly determining its use.
Type I (Weather & Boil-Proof - WBP): Uses Phenol-Formaldehyde (PF) resin glue. Offers the best durability and can be used outdoors long-term. Examples: concrete formwork, outdoor structures.
Type II (Water-Resistant - WR): Uses Urea-Formaldehyde (UF) resin glue. Resistant to moisture and short-term cold water immersion, suitable for indoor humid environments. Examples: kitchen and bathroom furniture.
Type III (Moisture-Resistant - MR): Uses blood glue, low-formaldehyde UF resin, etc. Resists short-term moisture, for general indoor use. Examples: common furniture, packaging.
By Surface Finish: Sanded panels, overlaid panels (with wood veneer, decorative paper, melamine-impregnated paper, etc.), pre-finished panels.
By Wood Species: Hardwood plywood (e.g., poplar, birch, beech), Softwood plywood (e.g., pine, fir).
By Structure: Ordinary plywood, Special plywood (e.g., aircraft plywood, fire-retardant plywood, preservative-treated plywood).
| III. Main Application Fields |
Construction Industry: Concrete formwork, interior decoration (ceiling, partition walls, flooring substrate).
Furniture Manufacturing: Table tops, cabinet bodies, sofa frames, chairs, stools.
Packaging Industry: Export crates, equipment lining boards.
Transportation Industry: Interior panels and flooring for automobiles, trains, and ships.
Others: Speakers, sports equipment, advertising boards, etc.
| Ⅳ. Plywood Production Process |
A complete plywood production line is a complex system engineering project. Its core objective is to transform raw logs into laminated panels that meet standard requirements through a series of physical and chemical processes.
Stage 1: Raw Material Preparation
1. Bucking/Cutting: Purchased logs are cut into shorter lengths (called blocks or peeler blocks) suitable for the lathe.
2. Debarking: Bark is removed using drum or hydraulic debarkers. Bark lacks fibers and contains impurities, so it must be removed.
3. Steaming/Conditioning: Log blocks are soaked in hot water baths.
Purpose: To soften the wood, making it easier to peel, reducing veneer tearing and splits, and improving veneer quality. Steaming time and temperature must be precisely controlled based on wood species and season.
Stage 2: Veneer Production
This stage determines the surface quality and grade of the final panel.
4. Peeling/Lathing: This is the core process. The conditioned block is mounted centrally in a lathe and rotated. A sharp blade is advanced continuously against the block, peeling off a continuous ribbon of veneer.
Key technical parameters: Peeling speed, knife gap (determines veneer thickness), cutting angle. High-precision lathes produce veneer with minimal thickness variation.
5. Clipping/Cutting: The continuous veneer ribbon is cut into sheets of predetermined width and length by high-speed clippers.
6. Drying: Freshly peeled veneer has high moisture content (often >50%) and must be dried. Typically done using roller or jet dryer systems to reduce moisture content to 8-12%.
Purpose: a) Meet adhesive curing requirements; b) Prevent mold; c) Reduce subsequent warping. Uniform drying is crucial.
7. Patching/Repairing: Dried veneer sheets are graded. Sheets with defects (e.g., knots, splits) are repaired. Small holes are filled with putty, larger defects are cut out and replaced with patches, improving wood yield.
Stage 3: Gluing & Layup
8. Gluing/Spreading: Dried veneer sheets pass through a glue spreader. Glue rollers apply adhesive (e.g., UF, PF) evenly to one or both sides of the veneer. Glue Spread Rate (GSR) is a key control point; too much causes waste and glue bleed-through, too little weakens the bond.
9. Layup/Assembling: Manual workers or automated layup machines stack the glued and unglued veneers in the predetermined number of piles (layers) with their grains oriented perpendicularly to adjacent layers, forming a "mat." Layers are usually odd-numbered to ensure a symmetric, balanced structure preventing warpage. Automated layup machines precisely control the position of each veneer layer, which is key to achieving high quality and efficiency.
Stage 4: Hot Pressing
This is the core stage of production, directly determining the plywood's bond strength and final thickness.
10. Pre-pressing (Optional): Before hot pressing, the mat may undergo cold pressing or mild hot pressing to preliminarily bond it into a solid unit for easier handling and loading into the hot press, preventing mat collapse.
11. Hot Pressing: The assembled mat is loaded into a multi-opening hot press or a continuous press. Under high temperature (e.g., UF glue: 100-120°C; PF glue: 130-150°C) and high pressure (typically 1.0-1.6 MPa / 145-232 psi), it is held for a set time. Purpose: a) Melt, flow, and cure the adhesive to form a strong bond; b) Compress the mat to the desired final thickness. Temperature, pressure, and time are the three core process parameters and must be set precisely according to glue type, panel thickness, and wood species.
Stage 5: Finishing
12. Cooling: Panels exiting the hot press are very hot and must be immediately separated and cooled to stabilize internal stresses and prevent warping.
13. Trimming & Sanding: The cooled panels with rough edges first go through panel saws to be trimmed to standard length and width. Then they are sanded by wide-belt sanders.
Purpose: a) Remove the pre-cured surface layer and defects; b) Make the surface smooth; c) Ensure consistent and precise thickness across the entire panel. High-precision lines use thickness sanding (calibrating).
14. Grading, Inspection & Packaging: Finally, according to national or industry standards (e.g., GB/T 9846 in China), panels are inspected and graded based on appearance, dimensions, moisture content, bond strength, etc. Qualified products are labeled and packaged for storage.
A plywood production line capable of achieving ±0.5mm tolerances represents a deep integration of precision machinery manufacturing, automation control, sensor technology, and wood processing craftsmanship. It is no longer a traditional "woodworking" setup but more akin to a precision instrument for manufacturing panels. Its investment cost, technical complexity, and maintenance requirements far exceed those of a standard plywood line. However, the high-value-added products it yields also define its competitive edge in the premium market.
This production line is your ideal choice to enhance competitiveness and capture market share. We provide comprehensive turnkey project services, including planning, installation, commissioning, and personnel training.
Contact us now for a customized solution and quotation!
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
This tolerance level is far superior to that of ordinary construction formwork or standard furniture plywood (typically with tolerances above ±1.0mm). It represents a high-end, precision-grade industrial product primarily used in fields demanding extreme dimensional stability, flatness, and consistency, such as:
High-end furniture and cabinetry: Especially for system furniture using "bore-free installation" techniques, which require extremely precise panel dimensions.
Packaging cases and liners for precision instruments: Require a perfect fit for optimal protection.
Interior panels for luxury yachts and RVs: Require high lightweight properties and installation accuracy.
Substrates for laboratory countertops and cleanroom partitions: Require resistance to warping and high flatness.
Substrates for art framing and display structures: Require perfectly straight edges and flawless surfaces.
Achieving such stringent tolerances is not the result of a single machine but rather the combined effect of an entire precision production system, high-accuracy equipment, and strict quality control processes.
| Core Components |
The entire production line can be divided into the following key sections, each of which must meet corresponding precision requirements.
1. Raw Material Preparation and Processing Section
Goal: Ensure the quality and uniform thickness of the veneers, which is the foundation for all subsequent precision.
High-Precision Lathe/Peeler:
This is the "source" of the production line. It must use servo motor or hydrostatic drive systems to ensure extremely high knife gap accuracy, controlling the thickness variation of the peeled veneer within ±0.05mm.
Equipped with laser centering systems to ensure stable concentricity during log rotation, preventing uneven veneer thickness.
The blade material and grinding precision are also crucial for achieving a smooth, tear-free cut surface.
Precision Dryer:
The final moisture content (MC) of the dried veneer must be uniform, typically targeting 8%-12%, with a variation of no more than ±1% between sheets or across different areas of the same sheet.
Utilizes multi-platen belt or roller dryers equipped with accurate temperature and humidity sensors and automated control systems. These can automatically adjust drying curves based on wood species and initial MC, preventing over-drying or under-drying, which can cause subsequent warping.
CNC Clipping and Splicing Machines:
Dried veneers are cut to size by high-precision optoelectronic scanning clippers, producing neat edges.
For narrow veneer strips, automated splicers (e.g., finger-joint splicers, stitch splicers) are used to ensure the assembled full-size veneer sheets are seamless, flat, and of consistent strength.
veneer peeling machine
veneer dryer
2. Glue Application and Layup Section
Goal: Apply adhesive in an exact, uniform amount onto the veneers and precisely align each layer.
Precision Four-Roller Glue Spreader:
While standard lines might use two-roller spreaders, a high-precision line must use a four-roller machine.
The precise interaction between the pick-up roller, meter roller, glue roller, and counter roller allows for strict control of the glue spread rate (GSR), ensuring a uniform layer without misses or pools. The GSR error needs to be controlled within ±5g/m².
Glue viscosity requires automatic monitoring and adjustment.
Automated Layup Line (Robotic Layup):
This is one of the absolute core links for achieving ±0.5mm tolerance. Manual layup cannot achieve this precision.
Robotic arms equipped with vision recognition systems accurately pick and place each glued veneer layer.
High-precision sensors and positioning systems ensure each veneer layer is strictly aligned, with the core veneers' grain direction at 90 degrees to the face/back veneers. Misalignment between layers must be less than 0.5mm.
After layup, the edges of the mat are almost perfectly flush, setting the stage for precise trimming later.
3. Hot Pressing Section
Goal: Press the mat into a panel of specified thickness and density under precisely controlled temperature, pressure, and time.
High-Precision Hot Press:
Must utilize a multi-opening hot press (or a press with numerous individual cylinders) with synchronous control. Each cylinder's pressure is controlled by an individual proportional valve. A servo control system and network of pressure sensors ensure highly uniform pressure across the entire platen surface, preventing local thickness variations due to uneven pressure.
The hot platens themselves require extremely high machining accuracy, with flatness errors less than 0.1mm, and must offer uniform heat transfer.
Press Stops (Limit Stops) System: This is key to controlling the final thickness. High-precision lines use digital thickness control systems or high-tolerance metal stops to precisely control the final distance between the platens when the press closes, directly determining the finished panel thickness. The accuracy of this system is paramount for achieving thickness tolerance.
4. Finishing and Precision Machining Section
Goal: Size, trim, and sand the pressed rough panels to achieve the final exact dimensions and surface smoothness.
Double-Dimensional (Calibrating) Sander:
This is another absolute core piece of equipment for achieving ±0.5mm tolerance. Even minor thickness variations after pressing must be corrected by sanding.
Employs a CNC-controlled dimensional sander, typically configured with multiple heads (e.g., roughing, finishing).
High-precision laser scanners at the infeed and outfeed continuously measure the thickness across the entire panel surface. This data is fed back to the sander's control system, which automatically adjusts the height of the sanding heads to "target" areas exceeding tolerance. This ensures consistent thickness across every point of the panel, meeting the target value.
This system can easily control thickness tolerance to within ±0.1mm or better.
High-Precision Cross-Cut and Rip Saw (Optimization Saw):
Utilizes a CNC sawing system driven by servo motors, precision ball screws, and linear guides.
The panel is aligned against a reference fence. The system cuts one side based on the set final dimension, then rotates the panel 90 degrees. The freshly cut edge is used as the new reference for cutting the adjacent edge, ensuring perfectly square corners and absolutely equal opposite side lengths.
Dimensional tolerance after sawing can be controlled within ±0.2mm.
sanding machine
plywood trimming saw machine
1. Intelligent Control System (The Brain): The entire line is controlled by a central PLC or industrial computer, often integrated with a MES (Manufacturing Execution System), to monitor and adjust parameters (temperature, pressure, speed, thickness, etc.) in real-time, enabling data traceability.
2. In-Line Quality Inspection (The Eyes): Laser scanners, vision cameras, moisture meters, and thickness gauges are installed at multiple critical points for 100% real-time inspection. This allows for immediate detection and rejection of non-conforming panels or provides feedback for upstream adjustment.
3. Stable Environment Control: The workshop requires a constant temperature and humidity environment (e.g., 25±2°C, 55%±5% RH). Because wood is hygroscopic, environmental fluctuations can cause dimensional changes in the panels, affecting final precision.
4. Strict Process Discipline and Quality Management System: Such as ISO 9001. From raw material intake to finished product storage, every process step has strict SOPs (Standard Operating Procedures) and inspection criteria.
| I. Core Characteristics and Advantages |
1. High Strength and Good Stability: The cross-graining (alternating grain direction of adjacent layers) counteracts wood's natural anisotropy. This gives plywood uniform strength, shrinkage, and swelling properties in all directions, making it resistant to warping and splitting.
2. Flexible Size Specifications: Compared to solid wood, plywood can be easily produced in large, wide panels to meet various application needs.
3. High Utilization Rate: It can be produced using fast-growing timber, small-diameter logs, or even wood scraps for veneer peeling, improving overall wood utilization efficiency.
4. Strong Decorative Potential: The surface can be laminated with various precious wood veneers, decorative papers, metal foils, etc., providing a wide range of decorative effects.
| II. Classification Methods |
Plywood can be classified in various ways, commonly:
By Water Resistance (Adhesive Performance): This is the most important classification, directly determining its use.
Type I (Weather & Boil-Proof - WBP): Uses Phenol-Formaldehyde (PF) resin glue. Offers the best durability and can be used outdoors long-term. Examples: concrete formwork, outdoor structures.
Type II (Water-Resistant - WR): Uses Urea-Formaldehyde (UF) resin glue. Resistant to moisture and short-term cold water immersion, suitable for indoor humid environments. Examples: kitchen and bathroom furniture.
Type III (Moisture-Resistant - MR): Uses blood glue, low-formaldehyde UF resin, etc. Resists short-term moisture, for general indoor use. Examples: common furniture, packaging.
By Surface Finish: Sanded panels, overlaid panels (with wood veneer, decorative paper, melamine-impregnated paper, etc.), pre-finished panels.
By Wood Species: Hardwood plywood (e.g., poplar, birch, beech), Softwood plywood (e.g., pine, fir).
By Structure: Ordinary plywood, Special plywood (e.g., aircraft plywood, fire-retardant plywood, preservative-treated plywood).
| III. Main Application Fields |
Construction Industry: Concrete formwork, interior decoration (ceiling, partition walls, flooring substrate).
Furniture Manufacturing: Table tops, cabinet bodies, sofa frames, chairs, stools.
Packaging Industry: Export crates, equipment lining boards.
Transportation Industry: Interior panels and flooring for automobiles, trains, and ships.
Others: Speakers, sports equipment, advertising boards, etc.
| Ⅳ. Plywood Production Process |
A complete plywood production line is a complex system engineering project. Its core objective is to transform raw logs into laminated panels that meet standard requirements through a series of physical and chemical processes.
Stage 1: Raw Material Preparation
1. Bucking/Cutting: Purchased logs are cut into shorter lengths (called blocks or peeler blocks) suitable for the lathe.
2. Debarking: Bark is removed using drum or hydraulic debarkers. Bark lacks fibers and contains impurities, so it must be removed.
3. Steaming/Conditioning: Log blocks are soaked in hot water baths.
Purpose: To soften the wood, making it easier to peel, reducing veneer tearing and splits, and improving veneer quality. Steaming time and temperature must be precisely controlled based on wood species and season.
Stage 2: Veneer Production
This stage determines the surface quality and grade of the final panel.
4. Peeling/Lathing: This is the core process. The conditioned block is mounted centrally in a lathe and rotated. A sharp blade is advanced continuously against the block, peeling off a continuous ribbon of veneer.
Key technical parameters: Peeling speed, knife gap (determines veneer thickness), cutting angle. High-precision lathes produce veneer with minimal thickness variation.
5. Clipping/Cutting: The continuous veneer ribbon is cut into sheets of predetermined width and length by high-speed clippers.
6. Drying: Freshly peeled veneer has high moisture content (often >50%) and must be dried. Typically done using roller or jet dryer systems to reduce moisture content to 8-12%.
Purpose: a) Meet adhesive curing requirements; b) Prevent mold; c) Reduce subsequent warping. Uniform drying is crucial.
7. Patching/Repairing: Dried veneer sheets are graded. Sheets with defects (e.g., knots, splits) are repaired. Small holes are filled with putty, larger defects are cut out and replaced with patches, improving wood yield.
Stage 3: Gluing & Layup
8. Gluing/Spreading: Dried veneer sheets pass through a glue spreader. Glue rollers apply adhesive (e.g., UF, PF) evenly to one or both sides of the veneer. Glue Spread Rate (GSR) is a key control point; too much causes waste and glue bleed-through, too little weakens the bond.
9. Layup/Assembling: Manual workers or automated layup machines stack the glued and unglued veneers in the predetermined number of piles (layers) with their grains oriented perpendicularly to adjacent layers, forming a "mat." Layers are usually odd-numbered to ensure a symmetric, balanced structure preventing warpage. Automated layup machines precisely control the position of each veneer layer, which is key to achieving high quality and efficiency.
Stage 4: Hot Pressing
This is the core stage of production, directly determining the plywood's bond strength and final thickness.
10. Pre-pressing (Optional): Before hot pressing, the mat may undergo cold pressing or mild hot pressing to preliminarily bond it into a solid unit for easier handling and loading into the hot press, preventing mat collapse.
11. Hot Pressing: The assembled mat is loaded into a multi-opening hot press or a continuous press. Under high temperature (e.g., UF glue: 100-120°C; PF glue: 130-150°C) and high pressure (typically 1.0-1.6 MPa / 145-232 psi), it is held for a set time. Purpose: a) Melt, flow, and cure the adhesive to form a strong bond; b) Compress the mat to the desired final thickness. Temperature, pressure, and time are the three core process parameters and must be set precisely according to glue type, panel thickness, and wood species.
Stage 5: Finishing
12. Cooling: Panels exiting the hot press are very hot and must be immediately separated and cooled to stabilize internal stresses and prevent warping.
13. Trimming & Sanding: The cooled panels with rough edges first go through panel saws to be trimmed to standard length and width. Then they are sanded by wide-belt sanders.
Purpose: a) Remove the pre-cured surface layer and defects; b) Make the surface smooth; c) Ensure consistent and precise thickness across the entire panel. High-precision lines use thickness sanding (calibrating).
14. Grading, Inspection & Packaging: Finally, according to national or industry standards (e.g., GB/T 9846 in China), panels are inspected and graded based on appearance, dimensions, moisture content, bond strength, etc. Qualified products are labeled and packaged for storage.
A plywood production line capable of achieving ±0.5mm tolerances represents a deep integration of precision machinery manufacturing, automation control, sensor technology, and wood processing craftsmanship. It is no longer a traditional "woodworking" setup but more akin to a precision instrument for manufacturing panels. Its investment cost, technical complexity, and maintenance requirements far exceed those of a standard plywood line. However, the high-value-added products it yields also define its competitive edge in the premium market.
This production line is your ideal choice to enhance competitiveness and capture market share. We provide comprehensive turnkey project services, including planning, installation, commissioning, and personnel training.
Contact us now for a customized solution and quotation!
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
