CN201385353Y - A bamboo plywood made from large sheets of bamboo bundle curtains - Google Patents

Abstract

The utility model provides a bamboo plywood made of large pieces of bamboo curtains, which comprises a plurality of layers of bamboo curtains which are vertically intersected and stacked together. There are three parts of green, bamboo flesh and bamboo yellow. The upper and lower surfaces of the bamboo curtain include the bamboo green layer and the bamboo yellow layer with waxy layer and siliceous layer falling off respectively. The utility model uses the split bamboo tube to directly disentangle to make a large bamboo bundle curtain with bamboo green and bamboo yellow on it, so that a large number of small-diameter bamboos that cannot be used in the prior art can be used, and the processing is more convenient and the production efficiency is improved. higher.

Description

A bamboo plywood made from large sheets of bamboo bundle curtains

technical field

The utility model belongs to the field of man-made board manufacture and provides a bamboo plywood made of large bamboo bundle curtains.

Background technique

Bamboo has many advantages such as fast growth, high strength and good toughness, and is widely used in the production of wood-based panels. Chinese patent 02120518.3 provides a method for preparing small-diameter bamboo units with a diameter of less than 80mm, that is, using a bamboo degreening machine or a sandblasting degreening machine to degreen the bamboo, then split the bamboo into two halves with a bamboo splitter, and use a bamboo rolling machine Bamboo is rolled into horizontally non-broken, longitudinally loose and intertwined bamboo bundles. Although this method improves the utilization rate of bamboo, the process of removing green bamboo is relatively complicated and the production efficiency is low.

Utility model content

The purpose of the utility model is to improve the deficiencies of the prior art and provide a bamboo plywood made of large bamboo bundle curtains containing bamboo green and bamboo yellow.

The purpose of this utility model is achieved in that:

The bamboo plywood that the utility model provides with the manufacture of large-scale bamboo bundle curtains includes several pieces of width that are 50-600mm large-scale bamboo bundle curtains, and the large-scale bamboo bundle curtains described in adjacent layers are stacked vertically and intersectingly. A glue layer is set between the bamboo bundle curtain and the bamboo bundles in the bamboo bundle curtain to make it glued together to form a plywood, and the large piece of bamboo bundle curtain is formed at a point on the tube wall of the semicircular bamboo tube that is cut open and the inner section is removed. shape and segment-like cracks, forming a bamboo curtain with a network structure composed of interwoven bamboo bundles. The bamboo bundle curtain contains three parts: bamboo green, bamboo flesh and bamboo yellow. The upper and lower surfaces of the bamboo bundle curtain contain respectively There are bamboo green layer and bamboo yellow layer with waxy layer and siliceous layer shedding.

The density of the cracks on the bamboo curtain makes the width of the bamboo curtain reach 2-5 times of the arc length of the original semicircular bamboo tube.

Bamboo bundles are formed between adjacent cracks, and the diameter of the bamboo bundles is 0.10mm-5mm.

Wherein, the adhesive used in the adhesive layer is a phenolic adhesive, and the sizing amount of the raw material is 8-40% of the absolute dry weight of the raw material of the bamboo curtain.

Wherein, the adhesive used in the adhesive layer is an isocyanate adhesive, and the sizing amount of the raw material is 5%-20% of the absolute dry weight of the raw material of the bamboo curtain.

The bamboo plywood provided by the utility model is made of a large bamboo bundle curtain, which is formed by directly dissolving the semicircular bamboo tube wall, and is formed by a large bamboo bundle curtain with a bamboo green layer and a bamboo yellow layer on it, so that a large number of Small-diameter bamboos that cannot be used in the prior art can be utilized, and the processing is easier and the production efficiency is higher.

Description of drawings

Fig. 1 is the structural representation of large bamboo beam curtain;

Fig. 2 is the schematic diagram of the group blank structure of large bamboo beam curtain plywood;

Fig. 3 Structural schematic diagram of large bamboo bundle curtain plywood

Fig. 4 is the structural representation of the dispelling machine of processing large-scale bamboo beam curtain;

Fig. 5 a is the structural representation of the special-shaped gear that is arranged on the debonding roller of debonding machine as described in Fig. 4;

Fig. 5b is a side view structural schematic diagram of Fig. 5a;

Detailed ways

Example 1:

Use large-diameter thick-walled bamboo such as moso bamboo, giant dragon bamboo or green bamboo to make large pieces of bamboo bundle curtain plywood

The preparation of A large bamboo bundle curtain:

Saw the bamboo into bamboo sections with a length of 2.5m or 1.3m, split them longitudinally to form two semicircular bamboo tubes, and then send the semicircular bamboo tubes into the decomposing machine to decompose the bamboo yellow surface . The debonding machine can be a structure as shown in Figure 6, which includes a driving roller 4 and a debonding roller 5 that are rotatably fixed on the frame in parallel, with a gap therebetween, and the driving roller 4 is connected with the motor 1 through a reduction gear; Roller 5 distributes some loosening teeth on its roller circumferential surface, and there are blades on the loosening teeth, which extend intermittently along the circumferential direction of the loosening roller, and several rows of blades are distributed in the axial direction of the roller of the loosening roller; specifically , the motor 1 drives the friction roller shafting, that is, the driving roller 4 to complete the active rotation through a main reduction device 2 and a chain transmission device 3 . The debonding roller 5 is connected with the debonding roller support frame 6, and its height is adjusted by adjusting the cushion block 7 to change the radial distance between the driving roller 4 and the debonding roller 5. When the distance is determined, the debonding roller 5 is a rigid support. When carrying out the debonding of bamboo, the frictional force produced between bamboo and drive roller 4 makes bamboo enter the gap between drive roller 4 and decompression roller 5, and bamboo drives decompression roller 5 to rotate simultaneously. On the peripheral surface of the debonding roller 5, there are staggered and evenly distributed peripheral protruding decomposing teeth 8 in the shape of special-shaped convex teeth.

The bamboo yellow surface faces the debonding roller, and the green surface faces the power roller. After two times of defrosting, the bamboo yellow surface forms point-like or segment-like cracks and spreads radially under the action of longitudinal cutting and radial spreading force, while the green surface faces the power roller. The blue surface still maintains a relatively complete sheet structure, and the arc of the bamboo material is transformed from a structure in which the bamboo green surface is the outer arc and the bamboo yellow surface is the inner arc to a structure in which the bamboo yellow surface is the outer arc and the bamboo green surface is the inner arc; at this time, Put the green side of the bamboo towards the debonding roller, and the green side towards the power roller, and send it into the deflagging machine to decompose the green side of the bamboo. After 2 times of decompression, with the further refinement of the decomposing degree of the green side of the bamboo, the bamboo curtain will be finer. The arc-shaped structure faces the bamboo yellow again, and the deflation is completed after 3 alternate deflations. The length of the bamboo beam curtain that forms is 2.5m or 1.3m, and width is 450-600mm, and the bamboo beam curtain that the interwoven bamboo bundle of 9-20mm is formed comprises bamboo green, bamboo flesh and bamboo yellow three parts mesh structure bamboo curtain ( see picture 1). The diameter of each bunch of bamboo bundles is between 0.1mm-1mm.

B. Drying:

The above-mentioned bamboo bundle curtain is dried to a moisture content of 12%;

C sizing:

The adhesive used is a phenolic adhesive. The solid content of the phenolic resin adhesive is 12% of the dry weight of the raw material of the bamboo curtain by dipping and sizing. , placed vertically for 6 minutes, so that the adhesive on the surface no longer drips; dry the above-mentioned bamboo bundle curtain in an oven at 40°C until the moisture content is between 12%.

D. Formation:

Weigh the bamboo curtains according to the preset density, and splice the bamboo curtains with a length of 2.5m horizontally into bamboo curtain veneers with a width of 1.3m, and assemble the spliced bamboo curtain veneers in the direction along the grain Paving: The bamboo curtains with a length of 1.3m are spliced horizontally into a bamboo curtain veneer with a width of 2.5, and the above-mentioned spliced bamboo curtains are paved in the direction of the horizontal grain, with the bamboo yellow layer facing inward. The bamboo green layer faces outward, and the adjacent layers form a cross-structure blank (see Figure 2).

E. Hot pressing:

In the above hot-pressing process, the hot-pressing time is 1.0 min/mm, the hot-pressing temperature is 150° C., and the hot-pressing pressure is 5 MPa.

The above-mentioned recombined bamboo plywood was tested according to the GB/T19536-2004 plywood standard for container floor, and the results are shown in Table 2.

Table 2 Main physical and mechanical properties of moso bamboo, giant dragon bamboo and green bamboo plywood

As can be seen from Table 2, under the condition of not removing bamboo green and bamboo yellow, adopting the method provided by the utility model to prepare various physical and mechanical performance indexes of the container bottom plate all reaches or exceeds the requirements of plywood for the container bottom plate.

Example 2:

Use small-diameter thin-walled bamboo such as Cizhu to make large-scale bamboo bundle curtain plywood

A. Production of large bamboo bundle curtains:

Cut Cizhu into bamboo sections with a length of 2.5m or 1.3m, and split them longitudinally to form two circular bamboo tubes, with the yellow side of the semicircular bamboo tubes facing the decomposing roller and the green side facing the power roller, and send them into the The deflagging machine decomposes the bamboo yellow noodles. After three times of decomposing, the bamboo yellow noodles form point-like or segment-like cracks and spread radially under the action of longitudinal cutting and radial spreading force, while the green noodles are still To maintain a relatively complete sheet structure, the arc of the bamboo is transformed from a structure in which the green side of the bamboo is the outer arc and the yellow side of the bamboo is the inner arc to a structure in which the yellow side of the bamboo is the outer arc and the green side of the bamboo is the inner arc; at this time, the bamboo green The green side faces the debonding roller, and the blue side faces the power roller, and is sent to the deflagging machine to decompose the bamboo green surface. After 3 times of defrosting, with the further refinement of the bamboo green surface, the arc-shaped structure of the bamboo bundle curtain will be restored again. Facing the bamboo yellow, after relieving it alternately for 2 times, the relieving process is completed.

The formed bamboo bundle curtain has a length of 2.5m or 1.5m, a width of 250-400mm, and a thickness of 2-5mm interwoven bamboo bundles to form a network structure bamboo bundle curtain comprising three parts of bamboo green, bamboo flesh and bamboo yellow. The diameter of each bunch of bamboo bundles is between 0.1mm-1mm.

B. Drying:

The above-mentioned bamboo bundle curtain is dried to a moisture content of 8% to 15%;

C. Sizing:

The adhesive used is an isocyanate agent, and a spray sizing method is adopted, and the sizing amount is 12% of the absolute dry weight of the raw material of the bamboo curtain. The above-mentioned isocyanate adhesive is evenly sprayed on the bamboo green surface and the bamboo yellow surface of the bamboo beam curtain according to the above-mentioned sizing amount;

D. Formation:

Weigh the bamboo bundle curtain according to the quality set, according to the bamboo yellow layer facing inwards, the bamboo green layer facing outwards, two Cizhu bamboo bundle curtains as a layer (because the bamboo wall is relatively thin, in order to reduce the deviation of the density in the layer, solid Two bamboo curtains are used as one layer), and the bamboo curtains with a length of 2.5m are spliced horizontally into bamboo curtain veneers with a width of 1.3, and the above spliced bamboo curtain veneers are paved according to the direction along the grain; Splice bamboo curtains with a length of 1.3m horizontally to form bamboo curtain veneers with a width of 2.5mm, pave the spliced bamboo curtains in the direction of horizontal grain, and use cross-structure blanks for each layer of bamboo curtains , see Figure 2.

E. Hot pressing:

Apply the release agent on the hot pressing plate of the hot pressing machine, and send the above-mentioned slab into the hot pressing machine. The hot pressing process is as follows: the hot pressing time is 0.9min/mm, the hot pressing temperature is 110°C, and the hot pressing The pressure is 5MPa.

The above-mentioned Cizhu plywood was tested according to the GB/T19536-2004 plywood standard for container floors, and the results are shown in Table 3. It can be seen from Table 3 that the physical and mechanical performance indicators of the container floor prepared by using the bamboo bundle curtains of Cizhu all meet or exceed the requirements of the plywood for the container floor.

Table 3 Comparison table of test results of Cizhu plywood

Claims (5)

1. bamboo plywood made from large piece of bamboo bundle curtain, it is characterized in that, comprise that by the several layers width be the 50-600mm large piece of bamboo bundle curtain, stack to the described large piece of bamboo bundle curtain square crossing of adjacent layer, between adjacent described bamboo bundle curtain and the bamboo bundle in the bamboo bundle curtain, glue-line is set, make it to be consolidated into and be wood-based plate, described large piece of bamboo bundle curtain, it is for forming point-like and line segment shape crackle on the barrel of the semicircle thick bamboo tube of cutting and remove internal segment open, constitute cancellated bamboo bundle curtain, comprise surf green on this bamboo bundle, three parts of bamboo meat and tabasheer include bamboo green layer and the tabasheer layer that wax coat and silicrete come off respectively in the upper and lower surface of this bamboo bundle curtain.

2. the bamboo plywood made from large piece of bamboo bundle curtain according to claim 1 is characterized in that: the density degree of the described crackle on the described bamboo bundle curtain makes the width of bamboo bundle curtain reach original 2-5 times of cutting semicircle thick bamboo tube arc length open.

3. the bamboo plywood made from large piece of bamboo bundle curtain according to claim 1 and 2 is characterized in that: form the bamboo bundle between the adjacent described crackle, the diameter of this bamboo bundle is 0.10mm-5mm.

4. according to claim 1ly make bamboo plywood with large piece of bamboo bundle curtain, it is characterized in that: the used adhesive of described glue-line is the phenolic aldehyde adhesive, and the resin added of its raw material is the 8-40% of bamboo bundle curtain raw material oven dry weight.

5. the bamboo plywood made from large piece of bamboo bundle curtain according to claim 1, it is characterized in that: the used adhesive of described glue-line is an isocyanate adhesive, the resin added of its raw material is the 5%-20% of bamboo bundle curtain raw material oven dry weight.

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