New technology for wood physical modification: solid wood layered compression technology

This achievement has made a breakthrough in the physical compression enhancement and modification technology of wood, and innovatively developed the controllable layered compression of low-density wood.

The position and thickness of the compression layer can be controlled

Using this technology, the surface or any middle layer of low-density wood that needs to be strengthened can be selectively compressed and strengthened according to the requirements of wood product processing and use, while the remaining parts are not compressed, thus achieving precise control of wood compression reinforcement.

Solid wood layered compression technology mainly solves three technical problems: precise control of the position of the compression layer, precise control of the thickness of the compression layer, and fixation of compression deformation.

Top: Photo of solid wood; Bottom: Soft X-ray photo

Density distribution map

Low compression rate and less volume loss

The compression rate can be reduced to below 20%, effectively reducing the volume loss caused by compression and densification. In terms of large-scale production, a continuous production method for layered compressed wood and suitable production equipment have been developed, resulting in a low-cost production process and solving the cost problem of large-scale production.

Compressed wood significantly enhances performance

Regardless of whether the compression layer is located on the surface or in the middle, the density of the compression layer can reach over 0.8g/cm³. For poplar surface compression wood, the density of the compression layer can reach over 1.8 times that of the control material, and the hardness can reach over 2.4 times that of the control material. The wood's moisture absorption rebound rate is reduced to 1.34%. Compared with the original material, the tangential dimensional stability under high temperature and high humidity conditions is improved by over 46%, and the dimensional stability under high temperature and low humidity environments is improved by over 80%.

Wide range of applicable materials

Solid wood layered compression technology is applicable to a wide range of wood species. After process adjustments, it can be applied to most coniferous and hardwood species. By utilizing the unique color and texture characteristics of different wood species, a wide variety of products can be produced to meet the diverse needs of consumers.

From left to right: Populus tomentosa, Okoume, and Canno

Density distribution map

Green and environmentally friendly processing and products

The process and products are environmentally friendly. Layered compression is a physical modification technology for wood. The process is completed under hydrothermal control without the addition of any chemicals. It is pollution-free and emission-free, making it environmentally friendly.

Simple production process and low cost

The production process of layered compressed wood is simple, and the processing costs mainly include the volume loss of wood compression, the energy cost of heating and cooling the press, labor costs, etc.

The furniture and flooring in the picture are made of 100% poplar layered compressed wood

Through environmentally friendly modification treatment, the performance of artificial forest wood can meet the requirements of manufacturing high-quality solid wood furniture, flooring and other wood products. It can not only effectively solve the resource shortage problem of solid wood flooring and furniture materials, but also use low-density wood directly as furniture and flooring materials, which also provides a new way to utilize fast-growing wood. It will also promote the cultivation of artificial timber forests, promote forest farmers' income growth and wealth, and fully realize the economic and social benefits of developing artificial forests.