阅读说明：本技术 全竹或竹木复合平行结构工程板材及其制造方法 (Full bamboo or bamboo-wood composite parallel structure engineering board and manufacturing method thereof ) 是由 徐梓芬 于 2019-11-06 设计创作，主要内容包括：全竹或竹木复合平行结构工程板材及其制造方法,属于板材领域,尤其是一种以竹子和原木为材料的平行结构板材及其制造方法。本发明的全竹或竹木复合平行结构工程板材,由竹片或是竹木复合片胶合热压而成,竹片或是竹木复合片是平行重叠铺装组成板坯。本发明的工程板可用于建筑物樑柱,密度高于一般胶合木,支撑力较强。(An engineering board with a full bamboo or bamboo-wood composite parallel structure and a manufacturing method thereof belong to the field of boards, in particular to a parallel structure board taking bamboo and log as materials and a manufacturing method thereof. The full bamboo or bamboo-wood composite parallel structure engineering board is formed by gluing and hot pressing bamboo chips or bamboo-wood composite sheets, and the bamboo chips or the bamboo-wood composite sheets are overlapped and paved in parallel to form a board blank. The engineering board of the invention can be used for building beam columns, the density is higher than that of common laminated wood, and the supporting force is stronger.)

1. The full bamboo or bamboo-wood composite parallel structure engineering board is formed by gluing and hot pressing bamboo chips or bamboo-wood composite sheets, and is characterized in that the bamboo chips or the bamboo-wood composite sheets are parallelly overlapped and paved to form a board blank.

2. The manufacturing method of the full bamboo or bamboo-wood composite parallel structure engineering board is characterized by comprising the following specific process steps:

s1: cutting moso bamboo or wood into segments, and cutting into bamboo or wood pieces with length of 80-300mm, thickness of 0.4-1.2mm, and width of more than 5 mm;

s2: drying bamboo chips or bamboo chips to make the water content be less than 12%;

s3: the dried bamboo chips or bamboo chips enter a glue spreader for gluing, wherein the glue spreading amount is 7-10% of the weight of the sliced sheets; the glue is an isocyanate glue or a phenolic glue or the combination of the two in any proportion;

s4: overlapping and paving the glued bamboo chips in parallel along the same direction to form a plate blank;

s5: putting the plate blank into a prepress for prepressing and forming into a substrate;

s6: and (3) putting the substrate into a high-temperature hot press for hot-press forming to prepare the parallel structure engineering plate, wherein the hot-press temperature is at least 130 ℃, the pressure is at least 6Mpa, and the hot-press time is at least 50 seconds per millimeter according to the thickness of the plate.

Technical Field

The invention belongs to the field of boards, and particularly relates to a parallel structure board taking bamboo and log as materials and a manufacturing method thereof.

Background

At present, most of world engineering wood materials are made of pine wood for more than 30 years, and as the pine wood belongs to the class of medium-low density big cork wood, the compression strength, the elastic modulus and the physical properties of the produced shaving board still can not reach 750kg/m³The physical performance standards of boards made from hardwoods with densities above have not been able to replace a large number of solid hardwood boards for load carrying and structural purposes. As is known, hardwoods are mostly produced in original forests, the growing period of the hardwoods is more than one hundred years, the trees are precious biological resources of human beings, and once the trees are felled, the trees are difficult to recover, so that the ecological environment is seriously influenced. Therefore, the temperature of the molten metal is controlled,the existing wood board can only be made of soft wood materials such as pine, fir and the like, the production process is complex, the manufacturing cost is high, the indexes of hardness, strength and the like of the product are limited to a certain extent, the product is difficult to be popularized as a substitute of hard wood, and the application range is limited greatly.

Although the existing wood engineering wood is widely applied to the construction of wooden houses, the main beam column of the house still needs to use solid wood laminated wood to meet the requirement. At present, over 65% of the building laminated wood is imported from all over the world in China. In China, because wood resources are less and precious, the production of products capable of replacing expensive solid wood laminated wood has a very strong demand on building construction.

In recent years, China develops from cities to villages, people live in green water green mountains and replace wood with bamboo, and the development is urgent; the wooden house building is mainly used in rural areas, under the continuous development of China in the future, the wooden house building has a great deal of requirements, beam column materials which can be produced independently are very necessary, and the full bamboo or bamboo-wood composite parallel structure board is an important product which can fill the blank of China in the area.

Object of the Invention

The invention aims to provide a production preparation technology, which can be used for selecting bamboo and fast-growing wood, manufacturing engineering boards with stable performance and capable of replacing hardwood and high-density solid wood laminated wood, and expanding the application of bamboo in the field of buildings.

The full bamboo or bamboo-wood composite parallel structure engineering board is formed by gluing and hot pressing bamboo chips or bamboo-wood composite sheets, and is characterized in that the bamboo chips or the bamboo-wood composite sheets are overlapped and paved in parallel to form a board blank.

The manufacturing method of the full bamboo or bamboo-wood composite parallel structure engineering board comprises the following specific process steps:

s1: cutting moso bamboo and wood into segments, and cutting into bamboo chips or wood chips with length of 80-300mm, thickness of 0.4-1.2mm, and width of more than 5 mm;

s2: drying bamboo chips or bamboo chips to make the water content be less than 12%;

s3: the dried bamboo chips or bamboo chips enter a glue spreader for gluing, wherein the glue spreading amount is 7-10% of the weight of the sliced sheets; the glue is an isocyanate glue or a phenolic glue or the combination of the two in any proportion;

s4: overlapping and paving the glued bamboo chips in parallel along the same direction to form a plate blank;

s5: putting the plate blank into a prepress for prepressing and forming into a substrate;

s6: and (3) putting the substrate into a high-temperature hot press for hot-press forming to prepare the parallel structure engineering plate, wherein the hot-press temperature is at least 130 ℃, the pressure is at least 6Mpa, and the hot-press time is at least 50 seconds per millimeter according to the thickness of the plate.

The prepressing process has no corresponding requirements on temperature and pressure, is only pressed for a short time, but can be formed firstly, and the hot pressing time is shortened.

The moisture content of the dried bamboo chips and wood chips is lower than 12 percent, so that the glue is applied conveniently. Because the glue also contains water, the water content is too high after a plurality of drying processes, the water content of the material is increased after the glue is applied, the hot press is not easy to discharge the water in the plate, the plate is foamed, and the plate is not formed.

The bamboo and wood slice has the size of 80-300mm in length, 0.4-1.2mm in thickness and more than 5mm in width. The structural board used in the building field is mostly designed by the forward grains of the material, the bamboo chips are lengthened, the strength of the forward grains of the board can be increased based on the plane gluing theory, but due to the shape of the bamboo, when the bamboo chips are longer than 300mm, the bamboo chips are easily broken into two sections and curled due to the relationship of bamboo joints, and the integrity of the shape of the bamboo chips is reduced, so that the structural board is determined to be 80-300mm in use as the optimal length.

The full bamboo or bamboo-wood composite parallel structure engineering board can be used for building beam columns, and the density can reach 0.9T/m³Higher than 0.7T/m of common laminated wood³The supporting force is strong. The elasticity modulus of the physical properties can reach more than 10GPa, which exceeds 8GPa of a common structural material; the static bending strength can reach more than 100Mpa, which exceeds 80Mpa of common structural materials; the I-beam shear-resistant bearing capacity of the cross section of the bearing beam can reach more than 170KN, and the bearing beam can completely meet the structural material of common bearing beams. By reasonable section design, the section bar member with high strength and less material consumption is prepared and applied to the field of buildings。

Detailed Description