Vietnam is becoming a key supplier of LVL (Laminated Veneer Lumber) for markets like Korea, Japan, and Southeast Asia. However, not all LVL products are created equal. While many factories offer reliable quality, some common defects may still occur, especially when quality control is inconsistent. In this article, we will go through the most typical defects found in Vietnamese LVL, how to spot them early, and why TT&H Plywood is a trusted partner in delivering consistent quality.
1. Delamination (Lỗi tách lớp)
What it is:
Delamination refers to the separation of veneer layers due to poor bonding.
How to detect it:
- Tap the surface and listen for a hollow sound.
- Visually inspect the edges for visible gaps between layers.
- Try bending the LVL — separation may occur in weakly bonded areas.
Causes:
- Inadequate pressing pressure or temperature.
- Low-quality adhesive or insufficient glue spread.
- Wet veneers.
2. Core Gaps and Overlaps (Lỗi rỗ ruột, chồng mí veneer)
What it is:
These occur when the core veneers are not placed properly during assembly, leading to empty spaces or overlaps.
How to detect it:
- Cut a cross-section and inspect veneer alignment.
- Notice uneven surfaces or weak bending strength.
Causes:
- Manual layup process without strict alignment standards.
- Using irregular-sized veneers to reduce cost.
3. Glue Bleed (Lỗi tràn keo)
What it is:
Excess glue seeps to the surface, creating dark or sticky patches.
How to detect it:
- Visible dark spots or glue on surface veneers.
- Sticky or rough textures even after sanding.
Causes:
- Excess glue spread.
- Using veneers that are too thin or porous.
4. Warping or Bowing (Cong vênh)
What it is:
LVL panels bend or twist due to internal stress or moisture imbalance.
How to detect it:
- Place the panel on a flat surface and observe any gaps underneath.
- Measure deviation from straightness.
Causes:
- Uneven drying of veneers.
- Improper storage after production.
5. Surface Cracks or Splits (Nứt mặt)
What it is:
Fine cracks appear on the surface veneers, often after exposure to dry environments.
How to detect it:
- Visual inspection under good lighting.
- Pressing or light sanding may reveal fine cracks.
Causes:
- Using over-dried or brittle veneers.
- Stress from improper pressing or finishing.
Why Choose TT&H Plywood?
At TT&H, we specialize in export-quality LVL with strict QC procedures at every production step:
- Moisture-controlled veneer storage.
- Industrial-grade adhesives that meet international standards.
- Experienced technicians monitoring pressure and temperature settings.
- Final inspection before packing to catch defects before shipping.
Our factory proudly serves clients in Korea, Malaysia, Singapore, and Japan, offering consistent quality, on-time delivery, and clear communication.
Conclusion
Defects in LVL are common in any manufacturing process, but with the right systems, they can be minimized or eliminated. If you’re sourcing Vietnamese LVL, it’s important to understand the defects, how to identify them, and to work with reliable suppliers.
Contact TT&H today to discuss how we can supply you with premium Vietnamese LVL that meets your specifications.