Satoh Lumber Co.,Ltd


FSC®(Forest Stewardship Council)COC Certificate Holder Satoh Lumber Co., Ltd.
Certificate Code SGSHK-COC-350025 License Code FSC®C128338

The process for creating laminated wood


Laminated wood is made by bonding pieces of wood together using a special adhesive. Tree require many years to grow, so there is a limit to the size of the sheets obtainable. Laminated wood makes possible the application of sizes that would not be obtainable as a single sheet. In addition, through combining pieces, it is possible to make use of even small pieces of lumber, which helps in the efficient use of the resource.

In general, this results in an un-uniform wood grain, so it is less attractive than using a single sheet. We are also often asked about its strength, but if the product is properly bonded using the correct adhesive in accordance with the product’s purpose (Ex. Outdoor use, etc.), then there is never a loss in strength in the adhesive surfaces.

1. Lumbering and sawing

Logs are systematically cut, while taking into consideration tree growth rates. The logs are sawed into planks by calculating the “drying allowance (the amount the wood shrinks as it dries)” and the “chipping allowance (the amount of surface shaved to turn it into laminated wood)” that is necessary to match the final thickness of the laminated wood.

Lumbering sawing

2. Drying and conditioning

The lumber created are sun-dried (air drying) for several weeks and then artificially dried in a drying room. Through the processes of artificial drying, the moisture in the wood (moisture content) is reduced to less than 10%. During the drying stage, the planks shrink, twist, bend, warp and crack. This shows the nature and individuality of each tree as they differ based on their growing conditions. If the planks are not dried, it could cause cracks, bending or mold. Following the artificial drying procedure, the planks are removed from the drying room and exposed to the outside air for several days, which returns the moisture content to approximately 12%. (Conditioning)

Lumbering sawing

3. Wood conversion

The planks are checked one by one as they are cut into the width and length to be used. Unusable cracked and rotten planks are also removed.

Lumbering sawing

4. Machining (Unnecessary for solid edged-glued panels)

The surface is planed down using a molder, and previously hidden flaws are revealed through the process of wood conversion.


5. Classification and color-matching (Unnecessary for solid edged-glued panels)

Machined lumber is sorted by classification, and similar colors are grouped together.


6. Vertical joining (Unnecessary for solid edged-glued panels)

The pieces are vertically joined to match the requested length.
The adhesive areas are large and use highly precise finger joints to connect short planks in order to increase length.


7. Machining

Vertically-joined lumber (edge-glued panels make use of lumber that has undergone wood conversion) is further planed down using a molder, and the dimensions are adjusted to create a square.

8. Classification and color-matching

Machined lumber is sorted by classification, and similar colors are grouped together.


9. Widthwise joining

Following classification and color-matching, the pieces are joined widthwise. A special glue is applied to the adhesive surfaces, and the planks are placed in a special side-pressing machine where they are pressed for a set period of time.


10. Conditioning

Following widthwise joining, the planks are removed from the side-pressing machine and exposed to the outside air for one or two days.


11. Sanding

The surface is sanded down by a sanding machine to remove glue exposed by the widthwise joining process and bring the product to the specified thickness.


12. Trimming

The width and length of the product are cut to the specified dimensions using a precutting machine.

13. Inspection and packaging

The finished products are subjected to a close inspection one by one. They are then beautifully packaged and shipped.