CN1970254B - Curved bamboo material original state regroup material and its making method - Google Patents

Abstract

The invention relates to an original recombined arc-shaped bamboo material and a manufacturing method thereof, belonging to the field of materials. The original recombined material of curved bamboo is made of curved bamboo boards with smooth inner and outer surfaces arranged side by side in the same direction of the arc and bonded under pressure. The advantages of the present invention are: the present invention has the characteristics of hollowness, conical shape, large difference in physical and mechanical properties of bamboo green bamboo and yellow bamboo joints, etc., and the circular hollow bamboo is processed into arc-shaped bamboo blanks to maintain the natural structure of bamboo and recombine the original bamboo blanks , to produce high-strength recombined bamboo materials. The original recombined material of curved bamboo can replace precious wood and various artificial boards. Improve the utilization rate of bamboo resources and save forest resources.

Description

Curved bamboo original state recombined material and manufacturing method thereof

technical field

The invention relates to an original recombined arc-shaped bamboo material and a manufacturing method thereof, belonging to the field of materials.

Background technique

my country is the world's largest bamboo resource country. Bamboo has the characteristics of rapid growth and short rotation period. Processing hollow bamboo into composite materials that can replace wood can effectively alleviate the contradiction between supply and demand of wood in my country. Existing bamboo recombination technologies mainly include:

(1) Bamboo recombination technology: split the hollow bamboo into arc-shaped bamboo blanks, then process the bamboo blanks into bamboo square strips of a certain specification, and glue the bamboo square strips together to form bamboo boards or bamboo squares. Disadvantages and deficiencies: Cutting arc-shaped bamboo blanks into square strips results in a lot of waste of raw materials, and the utilization rate of moso bamboo is generally less than 30%.

(2) Fragmented bamboo recombination technology: after crushing the whole bamboo, it is reorganized and glued together to form bamboo boards or bamboo squares. Disadvantages and deficiencies: 1) The texture of natural bamboo is damaged to varying degrees; 2) Small voids are easily formed inside bamboo boards or bamboo squares, which affects the quality of the section.

(3) Small-diameter bamboo recombination technology: small-diameter bamboo is kneaded into bamboo bundles, restructured and glued together to form bamboo boards or bamboo squares. Disadvantages and deficiencies: the macrostructure of natural bamboo is destroyed, the "original state" of bamboo is lost, the surface quality is not good, and it cannot replace higher-grade solid wood.

Contents of the invention

The first object of the present invention is to provide a kind of original state recombined material of curved bamboo.

Another object of the present invention is to provide a method for manufacturing the original recombined material of the above-mentioned curved bamboo.

To achieve the above object, the present invention takes the following technical solutions:

The original recombined material of arc-shaped bamboo is made of smooth arc-shaped bamboo boards with green and yellow sides arranged side by side in the same direction of the arc and pressure-bonded. The radius of the inner arc and the radius of the outer arc of the arc-shaped bamboo boards equal.

Curved bamboo original state recombined material, the bamboo green and bamboo yellow smooth curved bamboo boards are arranged side by side in the same direction of the arc and pressure-bonded to form a board, and then the surface of several layers of boards is processed and flattened in the same direction Stacking, pressure bonding to form boards or squares with different thicknesses, the radius of the inner arc of the arc-shaped bamboo board is equal to the radius of the outer arc.

One or both ends of the arc-shaped bamboo board are milled into finger tenons, and the bamboo board can be extended to any length required by finger jointing.

The pressure bonding is thermal pressure bonding or cold pressure bonding.

The manufacture method of the original state recombined timber of curved bamboo comprises the following steps:

(1) sawing moso bamboo into lengths of 500-3000mm bamboo sections, and splitting the bamboo sections into arc-shaped bamboo chip blanks with a width of 20-60mm;

(2) Milling the bamboo green surface and the bamboo yellow surface of the arc-shaped bamboo chip blank to remove the inner and outer bamboo joints, and processing it into a light blank with a smooth surface whose radian is equal to the radius of the inner arc and the radius of the outer arc, and the fan shape corresponding to the inner and outer arcs The angle range is 30-120°;

(3) Mill one end or both ends of the bare blank into a finger-shaped tenon, and finger-join the blank;

(4) Apply glue to the bamboo green surface, bamboo yellow surface and finger-tenon joint surface of the bare blank, and then stack the blanks sequentially in the same direction of the arc; when forming the blanks, the seams of different finger-joined blank blanks can be arranged alternately;

(5) Carry out vertical and lateral simultaneous pressure fixation and natural curing (cold pressing method) on the curved bamboo chip assembly after gluing, or send it into a hot press for vertical and lateral simultaneous pressure curing (hot pressing method) , forming recombined bamboo;

(6) Processing the edge and surface of the recombined bamboo, sawing and cutting into certain specifications of the board;

(7) The surface of several layers of plates can be flattened and stacked in the same direction, and bonded under pressure to form plates or squares with different thicknesses.

The processing of the edge and surface of the recombined bamboo in step (6) usually involves trimming the edge, planing or sanding the surface.

The adhesive used in the present invention can be UF (urea-formaldehyde resin glue), PF (phenolic resin glue), MDI (isocyanate glue) or other commonly used adhesives in this field.

The innovation of the present invention is that the original shape of the bamboo is kept to the greatest extent, and the utilization rate is improved. Natural bamboo is tubular, and the inner and outer walls of the bamboo tube can be regarded as two concentric rings (note: the actual natural bamboo tubes are not all standard circles, most of them are approximately circular), so the radii of the inner and outer arcs of the bamboo blank are different. In order to realize that a plurality of bamboo slices are continuously matched and stacked, the bamboo base must be processed into equal arcs inside and outside, which is one of the key points of the present invention. The processing equipment of recombined bamboo is basically the same as the processing equipment of blockboard and plywood in this field, which is not the key point of the present invention, so no redundant description is needed.

The advantages of the present invention are: the present invention has the characteristics of hollowness, conical shape, and large difference in physical and mechanical properties of bamboo green bamboo and yellow bamboo joints, etc., and the circular hollow bamboo is processed into arc-shaped bamboo blanks, and the natural structure of bamboo is maintained, and the original bamboo blanks are recombined , developed a high-strength recombined bamboo material. The original recombined wood of curved bamboo can replace precious wood and various man-made boards. Improve the utilization rate of bamboo resources and save forest resources.

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, which are not intended to limit the present invention, and any equivalent replacements in the field performed according to the disclosure of the present invention belong to the protection scope of the present invention.

Description of drawings

Fig. 1 is a process flow diagram of the present invention.

Fig. 2 is a schematic diagram of cutting the moso bamboo to form an arc-shaped bamboo sheet blank, that is, the bamboo breaking process.

Fig. 3 is a schematic diagram of a smooth blank after milling and removing the inner and outer bamboo joints, that is, the milling process.

Fig. 4 is a schematic diagram of processing natural bamboo blanks with unequal internal and external radians into standard bamboo blanks with equal internal and external radians.

Fig. 5 is the process of milling one end or both ends of the bare blank into finger-shaped tenons, that is, the process of milling finger-tenons.

Fig. 6 is a schematic diagram showing the bamboo green surface and the bamboo yellow surface of the light blanks are glued and arranged side by side in the same direction in an arc shape.

Fig. 7 is a schematic diagram of the pressing direction of the slab.

Fig. 8 is a schematic diagram of the recombined board after pressure bonding.

Fig. 9 is a schematic diagram of a recombined square material formed by pressing and gluing the multi-layer boards.

Detailed ways

Example 1:

Referring to Figures 1 to 9, according to the different diameters of the bamboo, the bamboo is split into curved bamboo blanks of a certain specification, and the inner and outer bamboo joints are removed by milling, and then processed into "standard curved" bamboo blanks with the same specifications and smooth surface. , one end or double short milling finger tenon. Then arc-shaped anastomosis is superimposed and glued to form a board, or a second reorganization is made to form a square material. Specific steps are as follows:

(1) Cut the moso bamboo into standard sections with a length of 500-3000 mm according to the diameter, taper, wall thickness and straightness of the bamboo. The bamboo splitting machine is used to split the round bamboo into arc-shaped blanks.

Specifications: Length: 500～3000mm

Width: 20～60mm

  Thickness: natural wall thickness of bamboo

(2) Milling the bamboo green surface and the bamboo yellow surface of the arc-shaped bamboo chip blank to remove the inner and outer bamboo joints, and process it into a smooth blank with the inner arc radius equal to the outer arc radius, and the fan-shaped included angle range corresponding to the inner and outer arcs is 30 ~120°.

This step is referring to Fig. 4, and the outer arc radius R1 of the arc-shaped bamboo chip blank in the natural state is greater than the inner arc radius R2. After milling, the inner arc radius R1 is processed _into R, and the outer arc radius is all processed _into R. Make the new inner arc radius equal to the outer arc radius, that is, R _inner = R _outer , cut off the parts shown in the section to form a standard arc light blank.

(3) One end or both ends of the bare blank are milled into finger-shaped tenons, which can realize finger-jointed billets of unlimited length.

(4) Apply glue to the bamboo green, bamboo yellow surface and finger-tenon joint surface of the light rough blank with finger-shaped tenon, and then stack the blanks sequentially. The seams of different finger-jointed blanks can be staggered when forming blanks; thermosetting resins such as phenolic resins, melamine resins, and urea resins or other adhesives for wood-based panel production can be used.

(5) Hot pressing or cold pressing forming: The arc-shaped bamboo chip assembly after gluing is pressed and fixed naturally (cold pressing method) vertically and laterally at the same time (cold pressing method), or sent to a hot press for vertical and lateral simultaneous pressing Fast curing by pressing (hot pressing method) to form recombined bamboo.

1) Cold pressing process parameters

Working temperature: room temperature;

Vertical unit pressure: 1.5 ~ 2.0Mpa;

Lateral unit pressure: 0.5 ~ 4.0Mpa;

("Lateral pressure a" is greater than "Lateral pressure b")

Pressurization time: 12~36h;

Implementation method: fixed by fixture.

2) Hot pressing process parameters

Working temperature: 140～220℃;

Vertical unit pressure: 0.5 ~ 2.0Mpa;

Lateral unit pressure: 0.5 ~ 4.0Mpa;

("Lateral pressure a" is greater than "Lateral pressure b")

Pressurization time: 3~3min;

Realization method: For boards, use flat heat presses or special high-frequency heat presses used in solid wood flooring production lines; for long (above 3000mm) square recombined wood, use continuous high-frequency heat presses to facilitate internal heating and fast curing.

(6) Trimming the edges of the formed recombined board, planing the surface, and sawing into boards or squares of certain specifications as required.

(7) According to the different specific uses of the manufactured recombined wood, the board can also be reorganized again, after the board is glued, stacked, pressurized and heated to produce the original recombined square material of curved bamboo.

Claims (9)

1. curved bamboo material original state regroup, by the smooth arc bamboo clappers of surfaces externally and internally identical towards bonding the forming of discharging pressurization arranged side by side with its arc, the inner arc radius of arc bamboo clappers equates with the outer arc radius; One end or the both-end of described arc bamboo clappers are milled into finger joint, and adjacent described bamboo clappers constitutes the finger structure, and the finger seam of each layer bamboo clappers is staggered.

2. curved bamboo material original state regroup, by the smooth arc bamboo clappers of surfaces externally and internally identical with its arc towards the bonding sheet material of making of discharging pressurization arranged side by side, number laminate material can be stacked, the bonding formation of pressurizeing has the sheet material or the square bar of different-thickness, and the inner arc radius of arc bamboo clappers equates with the outer arc radius; One end or the both-end of described arc bamboo clappers are milled into finger joint, and adjacent described bamboo clappers constitutes the finger structure, and the finger seam of each layer bamboo clappers is staggered.

3. curved bamboo material original state regroup according to claim 1 and 2 is characterized in that: described pressurization bonding for hot pressing bonding or cold pressing bonding.

4. curved bamboo material original state regroup according to claim 1 and 2 is characterized in that: the binding agent of described bonding usefulness is UF or PF or MDI.

5. the manufacture method of curved bamboo material original state regroup comprises the steps:

(1) the mao bamboon sawing being become length is the bamboo section of 500～3000mm, and it is the arc bamboo chip blank of 20～60mm that the splitting of bamboo section is become width;

(2) inside and outside ring is removed in the bamboo strip and the yellow bamboo face milling of arc bamboo chip blank, being processed into radian is the ganoid smooth blank that the inner arc radius equates with the outer arc radius, and the pairing fan-shaped angular range of inside and outside arc is 30～120.；

(3) light blank one end or both-end are milled into finger joint, the finger assembly;

(4) with light blank bamboo strip, yellow bamboo face and refer to tenon faying face gluing, identical with arc then towards superimposed assembly successively, during assembly with the staggered discharging of the seam of different finger light blanks;

(5) the arc bamboo chip assembly behind the gluing is carried out vertical and side direction adds the press fit spontaneous curing simultaneously, or send into the vertical and side direction while cure under pressure of hot press, formation recombining bamboo;

(6) recombining bamboo edge and surface are handled, sawing becomes the sheet material of certain specification.

6. the manufacture method of curved bamboo material original state regroup according to claim 5 is characterized in that: also comprise the steps:

(7) will count laminate material Surface Machining and stack after smooth, the bonding formation of pressurizeing has the sheet material or the square bar of different-thickness.

7. the manufacture method of curved bamboo material original state regroup according to claim 6 is characterized in that: described stacking to stacking in the same way.

8. the manufacture method of curved bamboo material original state regroup according to claim 5 is characterized in that: described (6) are handled recombining bamboo edge and surface and are meant: to the edge repair, scrape in the surface or sanding is handled.

9. according to the manufacture method of claim 5 or 6 or 7 described curved bamboo material original state regroups, it is characterized in that: employed adhesive is UF or PF or MDI.

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