The Strand Woven Process: Why It Creates Exceptional Hardness

How Strand Woven Bamboo Starts: Choosing and Preparing the Raw Material

The journey begins with the selection of mature bamboo poles. Only culms between four and six years old are chosen because, by this stage, the fiber structure is fully developed and the starch content has dropped. Starch reduction is important not only for hardness but also for resistance to insects and microbial activity.

After harvesting, the poles are cut into smaller sections and then split along their length. Instead of being turned into narrow rectangular strips, the splits are shredded into long fibers. These fibers can vary in width and thickness depending on the manufacturer, but the goal is to create elongated strands that retain the natural strength of the bamboo’s vascular bundles.

The shredding stage is key. Bamboo’s power lies in its fibrous design. By converting the pole into strands, the process opens the structure while preserving the attributes that give bamboo its tensile strength.

Removing Starch and Moisture: Boiling, Carbonization, and Drying

Once shredded, the strands must be treated to remove sugars and reduce moisture. This step ensures stability and prevents problems such as mold, insect activity, or internal expansion after pressing.

Manufacturers use either boiling or carbonization:

Boiling cleans the fibers and lowers starch levels.
Carbonization uses heat to darken the fibers and further reduce organic material, creating a deeper color and slightly softer texture but improving dimensional stability.

After treatment, the fibers are dried until their moisture content reaches a controlled level, normally between 6% and 10%. Precision here matters. Too much moisture interferes with adhesive bonding and can cause internal steam pockets during compression. Too little moisture affects flexibility and can lead to cracking.

Adhesives: The Bond That Determines Strength

Strand woven bamboo derives much of its hardness from the combination of mechanical pressure and adhesive quality. The fibers are mixed with a resin, typically a low‑emission adhesive such as phenolic resin or E0/E1‑rated adhesives used for environmentally conscious construction.

The resin coats each fiber, ensuring that once pressed, the strands fuse into a solid mass. Adhesive quality determines not only hardness but also resistance to water, temperature changes, and long‑term wear. High‑grade resins maintain bond strength even under heavy foot traffic or furniture pressure.

The Compression Phase: Where Exceptional Hardness Is Born

The defining stage of the strand woven process is compression. Manufacturers use high‑tonnage presses to compress the resin‑coated strands into a dense block or board. The pressure can exceed several thousand tons, forcing the fibers together so tightly that voids disappear and the structure becomes nearly monolithic.

Two main pressing methods are used:

Hot pressing, where heat and pressure combine to cure the resin and compact the material.
Cold pressing, followed by a curing period, used by some factories for specific product lines.

Hot pressing is the most common method for flooring and heavy‑duty products because it yields consistent density and immediate structural curing.

During compression:

The fibers interlock in multiple directions.
The resin bonds deeply across the entire mass.
The density rises far above natural bamboo.

While natural bamboo typically has a density of around 600–700 kg/m³, strand woven bamboo can exceed 1,000–1,200 kg/m³. This density is what gives strand woven bamboo its famed hardness, often measuring more than twice the score of traditional bamboo on the Janka hardness scale.