Introduction to Veneer Drying Equipment

Introduction to Veneer Drying Equipment

A veneer dryer is a type of continuous drying equipment widely used in the wood processing industry to remove moisture from veneers. The main types of veneer dryers include belt-type dryers, roller-type dryers, and platen-type dryers. Below is a detailed explanation of their structure and working principles:

Main Structure

1. Drying Section

• الوظيفة: Heats the veneer through hot air circulation, accelerating moisture evaporation.
• Components: Composed of several identical chambers, each approximately 2 meters long.
• الميزات: The number of chambers determines the total length of the drying section. The longer the drying section, the faster the veneer moves through, increasing efficiency.

2. Cooling Section

• الوظيفة: Provides ventilation and cooling under pressure to the veneer. Its main purposes are:
  • Relieve internal stress in the veneer to keep it flat.
  • Utilize the temperature difference (higher in the middle, lower on the surface) to evaporate remaining moisture.
• Components: Usually consists of 1-2 chambers.

Types and Features

1. Belt-Type Dryer

• Conveyance Method: Uses upper and lower circulating belts.
  • Lower Belt: Responsible for transporting the veneer.
  • Upper Belt: Provides appropriate pressure to prevent deformation during drying.
• التطبيق: Suitable for veneers with a thickness of 0.5mm or more.
• Advantages: Well-suited for thin veneers and ensures stable operation.

2. Roller-Type Dryer

• Conveyance Method: Relies on the friction of paired upper and lower rollers to move the veneer forward.
• التطبيق: Suitable for veneers with a thickness of 1.0mm or more.
• Limitations:
  • The roller spacing restricts its use for thin veneers.
  • Best suited for thicker veneers.
• Advantages: Provides high pressing force, resulting in excellent veneer flatness.

3. Platen-Type Dryer

• الميزات: Uses platens to apply pressure, suitable for applications requiring high flatness.
• Application Scenarios: Ideal for drying veneers with specific high-precision requirements.

Comparison and Selection

Summary

The choice of veneer drying equipment depends on the thickness of the veneer, production efficiency requirements, and flatness needs. In industrial applications, belt-type dryers are commonly used due to their adaptability to thin veneers, while roller-type dryers are preferred for thicker veneers requiring higher flatness standards.