CN1105624A - Method for making high strength bamboo plywood - Google Patents

Abstract

The present invention relates to a method for making high-strength bamboo plywood, in particular it is a method for making bamboo plywood used as bottom plate for container. Its method is as follows: cutting out raw bamboo by its positions, splitting, layering and reshaping to make the raw bamoo into bamboo strips, then the bamboo strips are made into bamboo single-board, and then the bamboo single-board is dried till that its water ratio is 12-18%, and after having been sized, it is again dried till that its water ratio is about 12%, and then the bamboo single-boards are criss-cross arranged to form blank, and then hot-pressed to form bamboo plywood under the conditions of that its temp. is 140-170 deg.C, compression ratio is 1:1.15-1:1.5 and its pressure is 20 kg/m2-40kg/cm2. Its mechanization degree is high and its product quality is stable and homogeneous.

Description

Method for making high strength bamboo plywood

The present invention relates to a kind of manufacture method of high-strength bamboo veneer board, especially a kind of manufacture method of used for bottom plate of container bamboo plywood.International Patent classificating number is B27N.

In decades, container bottom board is owing to be subjected to the specification requirement of strict physical and mechanical property, and the high requirement on the roller shear intensity, so rely on the sheet material of frigid zone hardwood, tropical hard wood or the multi-plywood manufacturing of making always with these seeds, yet these seeds are long growth period, the a large amount of felling makes these hardwood resource exhaustions, causes the not enough and price rising of the container bottom board supply of material, and therefore selecting for use other materials to substitute and making container bottom board is the task of top priority.

Wood substituted by bamboo, constantly developing bamboo wood application is to alleviate forest reserves poorness, an effective technology measure of improving the ecological environment, relevant units at home and abroad has adopted following several processing methods in bamboo plywood production at present, as CN100368A, a kind of bamboo plywood that mao bamboon is made by technologies such as softening flattenings is disclosed, owing to adopt pressurization to flatten, make to form on the bamboo clappers and produce dry, thereby directly have influence on Strength of Plywood, and before softening the flattening during the sawed-off blanking of former material not according to the sorting of bamboo wood position, because the density difference of different parts bamboo wood causes the heterogeneity any combination thereof to cause thickness deviation, it is long that next exists softening flattening process route, energy resource consumption is big, defectives such as cost height.And a kind of container bamboo plywood is disclosed at CN2161443Y, it is to dry behind the inner skin of a bamboo stem impregnation with certain thickness and width, forms by cure under pressure behind the direction layering dress mould in length and breadth.But most of process belongs to manual operations in this technology, and the technology circuit is long, small scale, do not have quality certification system, the big section structure level of thickness deviation is not clear, and the space is big, mechanical property difference is big in length and breadth, quality instability, defective such as stock utilization is low.

The objective of the invention is to overcome above-mentioned shortcoming, a kind of manufacture method of high-strength bamboo veneer board is provided, it has the mechanization degree height, and constant product quality and homogeneous are applicable to the characteristics of container bottom board.

The objective of the invention is to be realized that by following technical solution former bamboo divides the position sawed-off, cut open bamboo, layering, shaping, produce bamboo chip, bamboo chip is made the bamboo veneer afterwards, and drying is to moisture content 12-18%, be dried to moisture content about 12% after the gluing again, the bamboo veneer intersects assembly in length and breadth, under 140-170 ℃ of temperature, compression ratio is 1: 1.15～1: 1.5, and pressure is 20kg/cm ²～40kg/cm ²Hot forming under the condition.

Wherein, even for guaranteeing the raw material quality, divide position, classification sawed-off to former bamboo.Cut open and cut open into the bamboo bar that 15-30mm does not wait width on the bamboo machine.And according to former bamboo different wall processing bamboo chip, promptly by the layering machine respectively with surf green, tabasheer and bamboo core separate.With trimmer with the discrepant bamboo bar of interior exterior string mill flat for wide, uniform thickness, etc. the bamboo chip of straight degree.

The further technical solution of the present invention is bamboo chip after the layering shaping is combined into the bamboo veneer with nylon wire braiding well-thought-out plan veneer or with adhesive tape on the jigsaw machine.

The further again technical solution of the present invention is that gluing can be adopted the single face gluing to the bamboo veneer, also can adopt two-sided gluing.And in by marine glue, mix a certain amount of anticorrisive agent.

Technical solution of the present invention also is included in the high-strength plywood surface and scribbles phenolic resins base plate coating or glass fibre reinforced plastic coating.

The high-strength bamboo veneer board that adopts the inventive method to make can be used for container bottom board, it is the substitute material that a kind of its physical and mechanical property satisfies the novel alternative timber of trans-container base plate standard fully, have the resource abundance, cheap, the stock utilization height, the mechanization degree height, constant product quality, thickness deviation is little, and the section structure space is little, mechanical property difference is little in length and breadth, advantages such as steady quality.And adopt uniform thickness, wide bamboo chip, eliminated the distortion that residual stress causes.

Other purpose of the present invention and advantage will further be illustrated among the described in conjunction with the accompanying drawings embodiment below.

Description of drawings is as follows:

Fig. 1 represents the sawed-off schematic diagram in former bamboo branch position;

Fig. 2 represents sawed-off former bamboo is cutd open the schematic diagram of well-thought-out plan bar;

Fig. 3 represents that the bamboo bar that will cut open handles respectively with surf green, tabasheer the schematic diagram that the bamboo core separates through layering;

Fig. 4 represents the bamboo bar of layering is become the schematic diagram of wide uniform thickness bamboo bar after shaping is handled;

Fig. 5 represents the specification bamboo chip is formed the schematic diagram of bamboo veneer;

Fig. 6 represents that high-strength bamboo veneer board of the present invention makes the schematic diagram of container bottom board.

Technological process of the present invention for former bamboo Divisional sawed-off → cut open the bamboo machine cut open into bamboo cane → through trimmer bamboo cane is flattened into the wide bamboo cane of uniform thickness → laminating machine get on surf green, be divided into the wide bamboo chip → bamboo chip of uniform thickness after removing the inner skin of a bamboo stem and make well-thought-out plan veneer → drying machine through plate joggling apparatus or braider and be dried to moisture content 12-18% → at gluing machine with waterproof resin glue gluing → drier, be about 12% → intersect in length and breadth assembly → hot-forming with the bamboo veneer to be the high-strength bamboo veneer board container bottom board to moisture content.

According to technology of the present invention, at first that former bamboo is sawed-off according to Len req, even for guaranteeing the raw material quality, carry out Divisional, the sawed-off (see figure 1) of classifying. Afterwards sawed-off former bamboo is split into the wide former bamboo cane of 15mm-30mm driving the bamboo machine, (see figure 2) is even in order to guarantee the bamboo plywood mechanical property, except strict with the classification processing of position when former bamboo is sawed-off, according to bamboo wood self structure and mechanics property analysis are learnt, the bamboo wall is by surf green, and bamboo core and bamboo are slightd yellow the composition, its surf green density is big, hard, mechanical property is good, and the bamboo core takes second place, and tabasheer density minimum strength is low, and this is the Fundamentals that cause bamboo wood irregular. For guaranteeing the material homogeneous, the present invention adopts laminating machine that Outer part and inner part of the bamboo is separated by laminating machine, surf green is in order to process bamboo mat or handicraft, tabasheer can be processed into the lower tabasheer glued board of quality, and the present invention produces the relatively more uniform bamboo core of quality by laminating machine the bamboo chip (see figure 3) of 1mm-5mm. Owing to exist the bamboo cane width difference that ring and former bamboo self-sow produce through bamboo cane sawed-off, after cuing open bamboo and layering, need bamboo cane is processed through trimmer, become the bamboo cane (see figure 4) of wide uniform thickness. The bamboo chip that draws by above-mentioned shaping layering operation basically thickness, directly degree equates with width. Then, the bamboo chip of satisfactory wide uniform thickness is woven in the bamboo veneer or is combined into bamboo veneer (see figure 5) with adhesive tape at the jigsaw face with nylon wire on special-purpose braider, because the width of bamboo chip, thickness is identical, straight degree difference is littler, by the mechanism of braider or plate joggling apparatus, the slit is reduced in the scope that GB allows (less than 1.5mm). Then with the bamboo veneer drying to moisture content 12～18%, use cement dipping machine Gluing, adhesive of the present invention can adopt conventional phenolic resins marine glue, also can adopt neoprene resin marine glue, or the higher resin marine glue of other water resistancees, and in adhesive of the present invention, mix 3.5kg/m according to the requirement for anticorrosion of international freight forwarding container bottom board³Bei Xilemu, Rui Dalemu, the antiseptic insect-resistant agents such as Rui Dasong (producing by Qingdao Jinyuan Co.), its phoxin residual volume is for being not less than 0.7kg/m³ The present invention can adopt two-sided gluing to the bamboo veneer, and its glue consumption is 110-140kg/m³, (solids content of glue is 50%), its glue consumption is 80-100kg/m during the single face gluing³ It is about 12% that bamboo veneer after the gluing is dried to moisture content again, will be in length and breadth to bamboo veneer intersection assembly. (its number of plies is 13～17 layers).

Multiple bamboo plys becomes the schematic diagram of integral box base plate to see Fig. 6, and it is by panel 1, base plate 2, and central layer 3, marine glue mixture 4 and coating consist of. Panel 1 and base plate 2 are single vertically bamboo clappers, be the rigidity of raising bamboo plywood, thereby reduce stressed rear distortion, can adopt two vertically bamboo veneers, or with two layers of vertical bamboo veneer, with two layers of vertical veneer or with more than two layers vertically veneer earlier at hot press with pressure greater than 40kg/cm²The high compression ratio bamboo veneer that is processed into. Central layer 3 can have some layers to intersect to mat formation to the bamboo veneer in length and breadth to form, and also the veneer made of available bamboo chip plates or other plant fiber forms. Scribble marine glue mixture 4 in each bamboo veneer phase cross surface. For guaranteeing the strict demand of container bottom board waterproof, scribble phenolic resins base plate coating or glass fibre reinforced plastic coating on its surface.

Container bottom board behind the assembly is 140 ℃-170 ℃ in temperature, and pressure is 20～40kfg/cm², compression ratio is: 1: 1.15-1: hot-forming under 1.5 the condition.

Adopt the made container bottom board of method of the present invention after measured its physical and mechanical property be: absolute drift＜10%, proportion are 0.8～0.85g/cm³, bonding strength＞2.5MPa, vertical MOR＞80MPa, bending strength＞40MPa, longitudinal modulus of elasticity＞10000MPa, transverse modulus of elasticity＞40MPa meets the technical indicator that international standard is stipulated fully.

Embodiment 1:

13 layers of multiple bamboo plys of bamboo plywood used for bottom plate of container of the present invention, panel and base plate are two vertically bamboo veneers, and hot pressing temperature is 150 ℃, and with the two-sided gluing of phenolic resin glue, its glue consumption is 100kg/m ³, hot pressing pressure is 20kg/cm ²The time.

Density 0.72 compression ratio 1:1.15

Horizontal 41 MPa of vertical 80 MPa of MOR

Horizontal 4050 MPa of vertical 10100 MPa of elastic modelling quantity.

Embodiment 2:

Its condition is identical with embodiment 1, and hot pressing pressure is 32kg/cm ²The time

Density 0.80 compression ratio 1:1.25

Horizontal 62 MPa of vertical 107 MPa of MOR

Horizontal 6100 MPa of vertical 11500 MPa of elastic modelling quantity.

Embodiment 3:

Its condition is identical with embodiment 1, and hot pressing pressure is 40kg/cm ²The time

Density 0.85 compression ratio 1:1.5

Horizontal 81 MPa of vertical 160 MPa of MOR

Horizontal 7000 MPa of vertical 11700 MPa of elastic modelling quantity.

Embodiment 4

15 layers of multiple bamboo plys of bamboo plywood used for bottom plate of container of the present invention; Panel and base plate are two vertically bamboo veneers, and hot pressing temperature is 150 ℃, and hot pressing pressure is 32kg/cm ², with the two-sided gluing of phenolic resin glue, its glue consumption is 110kg/m ³The time.

Density 0.81 compression ratio 1:1.26

Horizontal 65 MPa of vertical 109 MPa of MOR

Horizontal 6300 MPa of vertical 11700 MPa of elastic modelling quantity

Bonding strength 2.7 MPa.

Embodiment 5

15 layers of multiple bamboo plys of bamboo plywood used for bottom plate of container of the present invention; Panel and base plate are two vertically bamboo veneers, and hot pressing temperature is 150 ℃, and hot pressing pressure is 32kg/cm ², with the two-sided gluing of phenolic resin glue, its glue consumption is 110kg/m ³, the anticorrisive agent consumption is 3.5kg/m ³The time

Density 0.83 compression ratio 1:1.27

Horizontal 67 MPa of vertical 111 MPa of MOR

Horizontal 6500 MPa of vertical 12100 MPa of elastic modelling quantity

Bonding strength 2.9MPa good fortune gram Lyceum (phoxin) residual quantity 0.78kg/cm ³

Claims (8)

1, a kind of method for making high strength bamboo plywood, comprise former bamboo processing well-thought-out plan bar, dry, gluing, assembly and hot forming, it is characterized in that it is sawed-off that former bamboo is pressed different parts, cuts open bamboo, layering becomes the bamboo chip of wide uniform thickness with the shaping process for producing, its bamboo chip width is 1.5～3.0mm, then bamboo chip is generated bamboo veneer, drying, after being dried to moisture content after the gluing again and being about 12% with the longitudinal and transverse intersection assembly of bamboo veneer, under 140～170 ℃ of temperature, compression ratio is 1: 1.15～1: 1.5, and pressure is 20kg/cm ²Hot forming under the condition.

According to the described manufacture method of claim 1, it is characterized in that 2, layering is handled and comprised that going surf green to remove to slight Huang the bamboo bar is divided into 1～5mm uniform thickness bamboo chip.

3, according to claim 1 or 2 described manufacture methods, it is characterized in that, shaping handle comprise with interior exterior string variant and band ring cut open bamboo after the bamboo bar mill the flat bamboo chip of wide uniform thickness that is.

According to claim 1 or 2 or 3 described manufacture methods, it is characterized in that 4, bamboo chip is through knit nylon or splicing well-thought-out plan veneer.

According to the described manufacture method of claim 1, it is characterized in that 5, adhesive is the marine glue mixture.

6, according to the described manufacture method of claim 5, it is characterized in that, mix 3.5kg/m in the adhesive ³Anticorrisive agent, its phoxin residual quantity is greater than 0.7kg/m ³

According to claim 1 or 5 described manufacture methods, it is characterized in that 7, to the gluing of bamboo veneer single face, the glue amount is 80～100kg/m ³

8, according to claim 1 or 5 described manufacture methods, it is characterized in that, the two-sided gluing of bamboo veneer, glue consumption is 110～140kg/m ³

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