The Technical Process of Solid Wood Bending(Part 1)

Solid wood bending technology has a long history. In the mid-nineteenth century, the German Thonet used steam softening and shaping technology to achieve solid wood bending. He successively launched 14 sets of bentwood chairs in the Sessel series, setting a precedent for modern solid wood bending research.

One of the most memorable products is the No. 14 wooden chair, the first designer chair in the history of furniture to achieve mass production, with only 6 parts and 10 screws. It not only simplifies the form, realizes the flat packaging, the stability of the structure and the superb craftsmanship have also been perfectly interpreted. Between 1850 and 1930, the production volume of this seat exceeded 50 million, creating The myth of that era.

The solid wood curved chair is not only a miracle of that era but also has always influenced the design and manufacture of modern solid wood furniture in terms of shape and craftsmanship. And its core technology is the solid wood bending process. Steam bending wood technology is currently the most widely used method in industrial production. Hot press wood machine manufacturer shares with you.

1. Wool selection

Generally, the moisture content of the wool that is directly bent without softening treatment should be controlled at 10%-15%; the moisture content of the square lumber to be steamed and softened should be 25%-30%; the moisture content of the high-frequency softening treatment should be greater than 20%, And the moisture content of the treated wool is 10%-12%.

2. Softening treatment

The most suitable method for industrialized large-scale production in softening treatment is the high-temperature steam method, with a steam pressure of 0.02-0.05MPa and a steam temperature of 100-140°C.

The water boiling method is suitable for materials with low moisture content, and will bring out extracts, causing water pollution; the high-frequency heating method has fast heating speed, short softening period, and uniform heating. The thicker the wood, the more obvious the advantage; microwave heating The softening effect is good, the speed is fast, and the softening is uniform, which is the development direction; after chemical treatment, the stability is strong, and the rebound rate is low, but there will be certain chemical residues, which will cause subsequent troubles.

3. Solid wood bending

Bending is the most important and most complicated part of the whole process. There are different application methods according to the thickness, bending radius, and bending dimension of the bending part.

(1) Ordinary solid wood bending process:

The thickness of the workpiece is relatively thin, within 25mm, and the radius of curvature is larger, above 450mm. It can be bent directly on a multi-layer hot press, but be careful to strike while the iron is hot and bend in high temperature and soft state. This method has high output and simple equipment investment, but the product shape stability is poor.

Our company provides solid wood bending machine.