CN100441406C - Bamboo-wood composite layered performance material and production method thereof - Google Patents

Abstract

The invention discloses a production method of a bamboo-wood composite layered performance material, the technical process of which is: rough processing of bamboo and wood, splicing, finishing, sizing, forming blanks, forming, and post-processing. In the bamboo-wood composite layered performance material prepared by the above-mentioned production method, the arrangement order of the bamboo-wood layers from top to bottom is the surface layer of the hardwood board, the core layer of at least one layer of softwood board, the bottom layer of the bamboo board, and each layer There is a fibrous buffer layer in between. According to the different mechanical properties of the bamboo and wood material itself, the present invention rationally carries out layered combination, which highlights the compressive performance of the surface layer, the light and cheap core layer, the tensile performance of the bottom layer, and the stress buffering performance of the buffer layer. It is combined with the optimized plan for the layered force distribution of beam materials, and small-diameter grade materials and tree branches are used as raw materials, which solves the difficulty of shortage of large materials. Opened up a new way for small materials to make great use of.

Description

Bamboo-wood composite layered performance material and production method thereof

technical field

The invention relates to a production method of a bamboo-wood composite layered structure material, which is especially suitable for the production method of beams used in construction.

Background technique

CN96231500.1 discloses the patented technology of "bamboo-wood composite laminated lumber" of Nanjing Forestry University. In this technology, bamboo slices are used as the surface layer material, and small-diameter thin wood boards such as masson pine are used as the core layer material. A double-sided glued wooden rotary-cut thin veneer is added between each layer, and pressed into a bamboo-wood composite laminated lumber. Compared with bamboo plywood, this material has its unique advantages, but this material is not suitable for load-bearing materials in forms such as beams. Because the surface layer is bamboo, it is not suitable for nailing, and it is easy to slip when it is connected with other components. Double-sided glued wooden rotary-cut thin veneer is used as a buffer layer, and the amount of glue used is slightly larger, and the uniformity is slightly insufficient.

Contents of the invention

Aiming at the above-mentioned deficiencies in the prior art, the purpose of the present invention is to design a kind of upper fabric with high compressive strength, non-slip, suitable for nailing, light and cheap core material, high tensile strength of the bottom material and cushioning. A bamboo-wood composite layered performance material with less and uniform glue used in each layer and different performance materials and a production method thereof.

The present invention can be realized with following measure: technological process is:

(1), rough processing of bamboo and wood. It mainly includes the splitting, drying, retrieving, sawing and planing processes of logs and bamboo;

(2) Splicing: use small-diameter grades, bamboo and wood processing residues, branch tips, etc. as materials, lengthen finger joints and widen side joints;

(3) Finishing: The spliced materials are then sawed, planed and sanded;

(4), sizing: choose the adhesive for cold pressing. Use non-woven fabrics and impregnated papers that match the length and width of the bonding surface, and make adhesive strips by dipping or double-sided gluing;

(5) Blank assembly: the upper layer is made of hard wood board with compressive strength ≥ 50Mpa along the grain, the core layer is made of light and cheap soft wood board, single layer or multi-layer, depending on the thickness of the beam, and the bottom layer is selected Bamboo panels with tensile strength along the grain ≥ 150Mpa, the surface layer, core layer and bottom layer are arranged longitudinally according to the fiber direction, and there is a rubber-containing fiber buffer layer between each layer.

(6) Forming: If the cross-section is a square beam, the length and width of each layer are equal, and the beam is in the shape of "I", the width of the upper layer and the bottom layer are larger than the core layer, and the above three layers The lengths are all equal, and they are cold-pressed with a press with a unit pressure of 1.5-2.5Mpa, and then cured and aged. The length of the material is 6000-9000mm, the cross-section is square or I-shaped, and the elastic modulus is ≥8000Mpa. Bending strength longitudinal ≥ 80Mpa;

(7), post-processing. After the molded products are cured and aged, they are then subjected to mechanical processing, color treatment, and surface treatment.

According to the different mechanical properties of the bamboo and wood materials, the present invention rationally carries out layered combination, which highlights the compressive performance of the surface layer, the light weight and low price of the core layer, and the tensile performance of the bottom layer, which is in line with the layered bearing properties of beam materials. Force distribution requirements, the amount of glue used in the buffer layer is small and uniform, and small-diameter grades, tree branches, and processing residues are used as raw materials, which solves the problem of shortage of large materials. Opened up a new way for small materials to make great use of.

Detailed ways

The present invention is described in further detail below with embodiment:

The present invention is described in further detail below with embodiment:

1. Rough processing of bamboo. It mainly includes the processes of splitting, drying, retrieving, sawing and planing of logs (bamboo).

2. Splicing. In order to save wood and reduce production costs, small-diameter grades, bamboo and wood processing residues, branch tips, etc. can be used as materials, which can be used after finger joint lengthening and side splicing widening.

3. Finishing. The spliced materials are then sawed, planed, and even sanded.

4. Sizing. Considering many factors, the adhesive for cold pressing should be selected. Use fibers such as non-woven fabrics and impregnated papers that match the length and width of the bonding surface, and make adhesive strips by dipping or double-sided gluing.

5. Blank assembly. The upper layer is made of hard wood board with compressive strength ≥ 50Mpa along the grain, and the core layer is made of light and cheap soft wood board, which can be single layer or multi-layer, depending on the thickness of the beam. The bottom layer is made of bamboo board with tensile strength along the grain ≥ 150Mpa. There is a buffer layer of non-woven fabric (impregnated paper) after sizing, that is, an adhesive strip, between each layer.

6. If the beam is square, the length and width of each layer are equal; if the cross-section is "I"-shaped beam, the width of the upper layer and the bottom layer are larger than the core layer, and the lengths of the above three layers are equal . For the same reason, the production of profiles of other shapes is no longer described in detail. Finally, it is cold-pressed with a press with a unit pressure of 1.5-2.5Mpa. Although hot-pressing is feasible, considering comprehensive considerations, cold-pressing is preferred. After pressing, there is a process of curing and aging.

7. Post-processing. After the molded products are cured and aged, they are then subjected to mechanical processing, color treatment, and surface treatment.

Example 1: Make an I-beam with a length of 9000 (unit: mm, the same below), a width of 120, and a total thickness of 210.

Use the branches of Qinggang tree, small-diameter poplar and moso bamboo, after rough processing such as splitting, drying, retrieving, planing, etc., respectively carry out finger-joint lengthening and side-jointing widening, and then make the size of beams according to needs According to the requirements of the shape and shape, the finishing process such as sawing, planing, sanding, etc. is carried out piece by piece. At the same time, the non-woven fabric is cut according to the corresponding size and shape, and the resorcinol resin glue is coated on both sides. The length is 9000, the width is 120, and the thickness is 30; the bamboo integrated board with the same size as the surface layer is used as the bottom layer; the length and thickness of two pieces of 90 and three widths of 60 are 9000 and 30 respectively The poplar integrated board is used as the core layer, two pieces with a width of 90 are adjacent to the upper layer and the bottom layer respectively, and the three pieces with a width of 60 are in the middle, and there is a glue-coated non-woven fabric as a buffer layer between each layer. Use a press with a pressure of 1.5-2.5Mpa to form it by cold pressing, and then solidify, age for a period of time, and perform post-processing to form an I-beam.

Example 2:

Use oak boards with a length of 6000 (unit: mm, the same below), a width of 120, and a thickness of 30 as the upper layer, and use finger-jointed and side-jointed bamboo boards with the same length, width, and thickness as the oak boards. The bottom board is made of five layers of fir boards with the same length, width and thickness as oak boards, and there are seven layers of bamboo wood. Each layer is coated with isocyanate glue on both sides. The same non-woven fabric or impregnated paper layer (six layers in total) of the above-mentioned bamboo board is used as a buffer layer. Cold-pressed in the press to become a bamboo-wood composite layered performance material with a length of 6000, a width of 120, and a thickness of 210 with a total of 13 layers of layered structure with a rectangular cross-section.

The modulus of elasticity of the beam thus prepared is ≥8000Mpa, and the static bending strength is ≥80Mpa in the longitudinal direction.

Claims (1)

1, a kind of production method of bamboo-wood composite layered performance material, it is characterized in that technological process is: (1) Rough processing of bamboo and wood: mainly including log and bamboo splitting, drying, retrieving, sawing and planing processes; (2) Splicing: Using small-diameter grades, bamboo and wood processing residues, and branch tips as materials, the finger joints are lengthened and the side splicing is widened; (3) Finishing: The spliced materials are then sawed, planed and sanded; (4) Glue sizing: select the adhesive used for cold pressing, use non-woven fabrics and impregnated papers that match the length and width of the bonding surface, and make adhesive strips by dipping or double-sided gluing; (5) Blank assembly: the upper layer is made of hard wood board with compressive strength ≥ 50Mpa along the grain, the core layer is made of light and cheap soft wood board, single layer or multi-layer, depending on the thickness of the beam, and the bottom layer is selected Bamboo panels with tensile strength along the grain ≥ 150Mpa, the surface layer, core layer and bottom layer are arranged longitudinally according to the fiber direction, and there is a rubber-containing fiber buffer layer between each layer; (6) Forming: If the cross-section is a square beam, the length and width of each layer are equal, and the beam is in the shape of "I", the width of the upper layer and the bottom layer are larger than the core layer, and the above three layers The lengths are all equal, and they are cold-pressed with a press with a unit pressure of 1.5-2.5Mpa, and then cured and aged. The length of the material is 6000-9000mm, the cross-section is square or I-shaped, and the elastic modulus is ≥8000Mpa. Bending strength longitudinal ≥ 80Mpa; (7) Post-processing: After the molded product is cured and aged, it is then subjected to mechanical processing, color processing, and finishing processing.