Glued wood is a sawn plate with a shorter length, a smaller width and a thickness of about 1-3 cm, which is spliced ​​with adhesive at the ends and sides, and then laminated in parallel along the fiber direction to have a prescribed size and Shaped structural material.
The main points of manufacture are as follows:
1. The sawn board should be artificially dried to achieve a moisture content of about 10%.
2. The sheet is machined with a high precision planer to form a precise, smooth glued surface.
3. Combination and gluing of slab: The part of the defect is removed or dispersed, and the combination of the slab is carried out in consideration of the mixing ratio of the sapwood and the heart material.
The widening of the sheet does not require side-gluing for general indoor glulam, but for glulam requiring high gluing strength and durability, side gluing must be performed.
The length of the sheet can be adjusted by butt joint, miter joint and tooth joint. Docking is a simple and economical method, but in terms of strength, the efficiency is also minimal, and it is not suitable for the longitudinal length of the structural glulam.
Miter is a gluing method for processing the end face into a bevel. The smaller the slope of the bevel, the greater the gluing strength. As long as the bevel length is more than 12 times the thickness of the plate, almost the same efficiency as the sound plate can be obtained. It’s about one tenth. A disadvantage of bevel gluing is the large loss of the cutting bevel material.
Tooth joint is a method of cutting the end surface into a zigzag shape. The inclination of the tooth shape, the pitch of the tooth, the shape of the top and the end section affect the strength of the glued part, and the efficiency is generally 60-80% of the quality of the material. With less material loss, it can be longitudinally connected with a series of special machine tools.
For longitudinal joint length joints, the joints of adjacent plates should not be in the same position. When assembling the blanks, care should be taken to make the joints of the plates staggered by 300-400 mm or more, otherwise the strength will be reduced.
Generally, glulam is a member with a large size and a complicated shape, so it is often formed by cold pressing or high frequency bonding.
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