Yudeng Pu Leather Factory: Wet Processing Technology

Technical Principles of Wet-Processed PU Leather

• Composition and Chemical Properties of PU Leather: PU leather is mainly composed of polyurethane (PU) resin, using a water-based dispersion system that is environmentally friendly and safe. By scientifically combining resin, plasticizers, and additives, the softness, strength, and surface gloss of the leather can be precisely controlled to meet different application requirements.
• Core Concept of Wet Processing: Wet processing refers to evenly applying a water-based PU solution onto the substrate, followed by water-bath or coagulation treatment. The polymer gradually forms a film, creating a porous or dense membrane structure. This process ensures that the leather achieves ideal flexibility and hand feel while maintaining uniform structure.
• Advantages of Wet Processing: Compared to dry or coating methods, wet-processed PU leather offers higher softness and comfort, with uniform pore structure and good breathability. Meanwhile, the water-based system reduces the use of organic solvents, meeting environmental standards and promoting sustainable production.
• Impact of Wet Processing on Leather Performance: Coating thickness, drying rate, and water-bath conditions directly affect the leather’s softness and surface texture. The pore structure and membrane uniformity determine breathability and durability. Through precise process control, wet processing can satisfy high-end market demands for feel, appearance, and functionality.

Wet Processing Production Workflow at Yudeng PU Leather Factory

• Raw Material Preparation and Formulation: The foundation of wet processing is high-quality water-based PU resin. Yudeng strictly controls incoming raw material inspections, including resin viscosity, solid content, and pH, ensuring material stability and reliability. Plasticizers and additives are precisely blended according to functional requirements such as waterproofing, flame resistance, or special textures.
• Coating and Wet Processing: Coating is the core stage of wet processing. Yudeng uses high-precision coating machines to ensure even application and controls film thickness by adjusting flow and speed. In the water bath or coagulation tank, the polymer gradually solidifies into a membrane. Strict control of temperature and water quality guarantees uniform film formation, avoiding bubbles or uneven thickness.
• Drying and Curing: After coating, the leather enters drying and curing zones, where temperature, humidity, and time are precisely controlled to allow complete polymer film formation, resulting in flexible and durable leather. Yudeng pays particular attention to uniform drying to prevent surface wrinkles or uneven thickness.
• Surface Finishing and Inspection: The dried leather undergoes embossing, coating, and surface finishing to enhance aesthetics and hand feel. Each batch is inspected for hand feel, visual quality, and mechanical properties, ensuring that thickness, softness, gloss, and color meet the standards of a professional pu leather factory.

Core Equipment and Advantages of Wet Processing

Main Equipment
Mixers ensure uniform dispersion of PU solution, coating machines achieve precise thickness control, drying and curing equipment maintain stable temperature and humidity, and surface treatment machines handle embossing and coating.

Automation and Intelligent Control
The production line is equipped with sensors and smart control systems that monitor coating thickness, flow, temperature, humidity, and curing rate in real-time. Data can be used for process optimization and stability analysis.

Equipment Optimization and Process Control

• Adjusting coating thickness and drying temperature achieves different softness and wear resistance.
• Controlling water bath temperature and flow improves membrane uniformity, ensuring consistent breathability and hand feel.
• Strict maintenance and calibration schedules reduce production deviations, increasing output and product consistency.

Efficient Production and Environmental Benefits
Through automated control, Yudeng can achieve stable batch production, reducing energy consumption and material waste. The use of water-based systems also lowers organic solvent emissions, aligning with environmental standards, further demonstrating the strength of this artificial leather factory.

Quality Control and Testing of Wet Processing

Key Process Parameter Monitoring

• Coating thickness, drying temperature, humidity, and curing time are strictly controlled.
• Viscosity and solid content of the water-based PU solution are regularly tested.
• The production line continuously monitors temperature, humidity, and flow to ensure uniform internal structure.

Advanced Testing Techniques

• High-precision visual inspection combined with manual checks ensures a smooth defect-free surface.
• Microscopic structure analysis: SEM is used to observe pore distribution and membrane thickness.
• Physical performance testing: Industrial tensile machines measure tensile strength and elongation at break; abrasion testers assess wear resistance.
• Chemical performance testing: resistance to water, sweat, solvents, flame, and environmental aging tests.

Environmental and Material Control

• Temperature- and humidity-controlled workshops ensure uniform moisture evaporation.
• Incoming raw material inspections control resin and additive quality.
• Air cleanliness management reduces dust impact on the surface.

Data Feedback and Process Optimization

• Inspection data is linked to automation systems to dynamically adjust process parameters.
• Historical batch data is analyzed to optimize coating speed, drying curves, and water bath treatment.
• Standard Operating Procedures (SOPs) and quality traceability systems are established to improve yield and consistency.

Yudeng’s Professional Advantages in Wet Processing

• Extensive Industry Experience: Yudeng has accumulated years of practical experience in wet-processed PU leather, familiar with various water-based PU formulations and functional material treatments, and can quickly solve common production issues while optimizing process parameters.
• Advanced Production Equipment and Technology: Automated coating machines, dryers, surface treatment equipment, and intelligent monitoring systems ensure precise control of temperature, coating thickness, and drying rate, guaranteeing stable, high-quality output from this pu leather factory.
• Strict Process Optimization and Quality Management: Precise control of process parameters ensures consistent softness, uniform thickness, and smooth surfaces. Through process monitoring and quality feedback mechanisms, yield and efficiency are maximized.
• OEM/ODM Customization Services: Yudeng provides one-stop customization from pattern design, color matching, to thickness selection. Whether for small-scale prototyping or large-scale production, the company meets customer requirements for functionality, aesthetics, and market positioning, reflecting the capabilities of a top artificial leather factory.

Wet processing is one of the most critical and precise techniques in PU leather production. Yudeng PU Leather Factory leverages extensive experience, advanced equipment, professional process control, and strict quality management to establish significant advantages in wet processing. In terms of softness, surface smoothness, and functionality, Yudeng provides high-quality, stable PU leather products for furniture, footwear, automotive interiors, and high-end consumer goods industries.