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Laminated Veneer Lumber

LVL(Laminated Veneer Lumber)

LVL used for major structural materials such as columns, beams, and foundations

LVL is a wood processing product made by laminating and adhering the fiber directions (grains) of veneer that have been cut by a cutting machine such as a rotary racer or slicer in parallel, “Laminated Veneer Lumber” It is called “LVL” for short. A single plate with a thickness of about 2 mm to 4 mm is used, and the number of laminated layers ranges from several layers to several tens of layers. LVL has an overwhelmingly large proportion of parallel layers in the fiber direction, and since the product is generally thick, it is used as a shaft/framework rather than as a face material.

LVL

Veneer laminates include working veneer laminates and structural veneer laminates.

The veneer laminated materials used for building are mainly used for fields, furrings, partitions, furniture and piano parts.
Structural laminated materials are used as foundation materials for wooden houses, such as foundations, needles, columns, and purlins.


LVLの特徴


LVL has excellent dimensional stability and accuracy

LVL not only enables efficient use of wood resources by using veneers, but also uniforms the water content by using dry veneers, and at the same time disperses defective parts such as knots. A product with excellent stability and accuracy is created.

We can use LVL to build long products

LVL is able to make long products by connecting and stacking the single plates to be used in the vertical direction while stacking and adhering. There is a scarf joint, etc., as a method of vertically connecting single plates, and since the vertically connected parts are stacked and bonded with a gap of a certain distance or more, the strength of the product can be equalized.

LVL has stable quality

Since LVL uses dried veneer, dispersion of vertical joints, and dispersion of defects by lamination, there is less variation in product strength. Therefore, stable quality is guaranteed.

We can provide products with dimensions according to the application

By adjusting the number of laminated veneers, it is possible to manufacture LVL with a thickness according to the application. In addition, it is possible to support a certain thickness by secondary bonding.

LVL makes it easy to treat chemicals such as antiseptic, insect repellent, ant repellent and flame retardant

The base and pillars of LVL have higher drug permeability than other lumber products, and are ideal for drug treatment using the pressure injection method.

Dry and highly-preserved product

Since the same dry veneer as plywood is used, the finished LVL is also dry. The water content is 14% or less based on the Japanese Agricultural Standard (JAS).

LVL production procedure
Peeling

The peeled-off skin is also used as biomass energy mainly for drying veneers.

Steamed

Steaming the log for a few hours will soften the wood and make it easier to peel off the katsura.

Veneer cutting

Peel the raw wood to make a board called veneer.

Veneer drying/dryer

The moisture content is reduced to 10% or less, moisture inspection, strength inspection, and appearance inspection are performed, and the grades are sorted based on the data.

Vertical joint (scarf joint)

Align the fiber direction with the traveling direction of the conveyor and connect them with a scarf joint.

Extruder (adhesive application)

Apply adhesive evenly.

Cold press (temporary pressing)

Temporarily adhere the adhesive to the veneer.

Hot press (hot pressing)

Heat and pressure are applied to the temporarily bonded plates to completely cure the adhesive.

High frequency press (secondary adhesion)

For large thickness, high-frequency press is used for secondary bonding (kneading). Dielectric heating, which enables rapid heating in a short time, provides uniform heating rapidly.

Finish

Determine the length and cut the surface smoothly. In addition, the inspector will inspect each one.

Testing/inspection

Every day, a quality control person unannounces the product and checks the wood strength, adhesive strength, etc.

shipment

It is carefully packed and shipped using our own Logistics system.

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