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Method for producing infinitely-long glued laminated timber through conventional hot press

A hot press machine, infinite technology, applied in wood processing equipment, wooden veneer joint, manufacturing tools, etc., can solve the problems of low strength, easy cracking and defects, labor and materials, etc., to achieve high production efficiency, The effect of convenient operation and simple equipment

Inactive Publication Date: 2018-06-12
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Finger joints have high requirements for processing equipment and technology, and finger joints are prone to defects. Due to the strength requirements, there are necessary gaps at the top of finger joints. The strength of finger joints is not high, and the bending strength is about 50% of the strength of raw materials. In addition, because bamboo has only longitudinal grains, it is easy to crack and be damaged, so it is not suitable to be processed into finger joints for lengthening; while miter joints need to process longer miter joints, which is labor-intensive and may cause seam misalignment. Thus affecting the tensile and flexural strength of glulam

Method used

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  • Method for producing infinitely-long glued laminated timber through conventional hot press
  • Method for producing infinitely-long glued laminated timber through conventional hot press
  • Method for producing infinitely-long glued laminated timber through conventional hot press

Examples

Experimental program
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Effect test

Embodiment 1

[0039] In the embodiment of the present invention, a method of using a fixed formwork to assemble the joints, and then connect long bamboo glulams, the steps are as follows:

[0040] 1) Drying: dry the bamboo to a moisture content below 12%;

[0041] 2) Fine planing and fixed length of the slats: fine planing on all sides of the slats, the thickness and width of the slats are fine planed to 6mm and 20mm respectively, and the fixed length is cut off at 2.1m;

[0042] 3) Processing of the end of the slat: after the straight clamping of the slat with the pneumatic clamping device, the end of the slat is processed into figure 1 The end face shown in -B forms a certain 30° hypotenuse with the long bottom edge of the slat.

[0043] 4) Glue application: apply phenolic glue to the surface of the slats to be glued, including the length of the end face, and the amount of glue applied is about 140g / m 2 (one side);

[0044] 5) Reserve blanks and joints: place the glued slats on the bla...

Embodiment 2

[0049] In the embodiment of the present invention, a method of lengthening laminated timber in the form of a notched joint with hooks processed on the end face, the steps are as follows:

[0050] 1) Drying: Dry the board to a moisture content below 12%;

[0051] 2) Slat planing and scar removal: Use a multi-blade saw to saw the 30mm-width slats, and then plan the slats on all sides to a thickness of 29mm, and cut off the scars and defects. Strip length is 360-1200mm;

[0052] 3) Machining of the end of the slats: After the straightness of the slats is clamped with a pneumatic clamping device, the ends of the slats are processed into such figure 1 Notches with hooks on the end faces shown in -D;

[0053] 4) Glue: Apply glue to the surface of the slats to be glued, including the length of the end face, using water-based isocyanate, the amount of glue is 150g / m 2 (one side);

[0054] 5) Reserve blanks and joints: place the slats coated with glue on the blanking table, displac...

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Abstract

The invention relates to a method for producing infinitely-long glued laminated timber through a conventional hot press. The method comprises the steps of (1) drying, (2) slat finish planing and length determining, (3) slat end machining, (4) gluing, (5) assembling and joint reserving, (6) glued laminated timber main body solidifying and (7) joint hot-press extension. The method has the advantagesthat firstly, through staggered splicing of multiple slats, multiple pieces of glued laminated timber made in the existing conventional hot press can be connected into the infinitely-long glued laminated timber without bevel or finger joint face machining after glued laminated timber pressing; secondly, the joint strength is high, and the requirements of different transportation means, projects and buildings can be met; and thirdly, equipment is simple, tools are easy to obtain, operation is convenient, and the production efficiency is high.

Description

technical field [0001] The invention relates to a method for producing infinitely long glued timber with a conventional hot press, and belongs to the technical field of wood and bamboo processing. Background technique [0002] Because wood or bamboo has natural properties such as heat insulation, humidity control, temperature control, and beautiful texture, it is widely used in transportation, construction, furniture, decoration and other industries. In addition, the wood or bamboo itself has a small diameter and many knots, so it needs to be extended to make a longer glulam. For engineering material users who require different length specifications, it is often necessary to add hot presses of different length specifications to produce glulam with different length specifications, or to lengthen the two ends of the processed glulam through two extension methods: Finger joints and miter joints. Finger joints have high requirements for processing equipment and technology, and...

Claims

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Application Information

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IPC IPC(8): B27D1/04B27D1/10
Inventor 许斌朱其孟陶瑜南李建华李永成
Owner NANJING FORESTRY UNIV
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