JP2000084904A - Manufacture of bamboo laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the fastness/hardness and the strength of a bamboo quality as a bamboo material and minimize the stretch and shrinkage of the bamboo by setting the thickness, the number of splittings, thickness or the like of a material bamboo within a specified range respectively and employing a carbonization treatment by a carbonization device and a drying process thereafter. SOLUTION: A material bamboo with 80-120 mm thickness is split into 8-10 pieces in the sectional peripheral direction, and these 8-10 pieces are cut off and further, their moisture content is set to be about 30% or less by solar drying or the like. After that, the bamboo pieces are finish-molded using a roller molder. In the following step, the bamboo pieces finish-molded to the 20-32 mm width and the 7-12 mm thickness, are carbonized using a carbonization device 6, and are loaded into a hot blast dryer to be dried by hot blast. In the carbonization device 6, the process to reduce a pressure to draw a vacuum and to apply a water vapor and the pressure is repeated. The carbonization device 6 increases the pressure of a saturated water vapor and thereby unifies the moisture content of the bamboo and achieves the uniform rise of the temperature of the moisture content. Consequently, the uniform boiling of the moisture content and the averaged dry state of the bamboo material are realized by blowing off a saturated water vapor in the device 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a bamboo laminate by combining small pieces of bamboo such as Moso bamboo and Shin bamboo. The bamboo laminate formed by this method is mainly used as a building material for houses, Used as flooring for offices and public facilities. Furthermore, it is used as various kinds of furniture and Coffin Box.

[0002]

2. Description of the Related Art Conventionally, as building materials or furniture materials,
Although there was a method of manufacturing wood laminates that aggregate small pieces of wood,
There was no effective manufacturing method for manufacturing bamboo laminates by combining small pieces of bamboo. Further, there has been no method for producing a bamboo laminate material intended to be used as a Coffin Box. Bamboo, a material used for these applications, removes bamboo vinegar (sugars, protein, organic acids, water, etc.), and if not dried sufficiently, cracks and cracks may occur. In addition to causing mold, it is easy for mold and insects to enter,
The bamboo material decayed and was very difficult to handle.

Conventional drying means include a hot air drying method, a high frequency drying method, a vacuum drying method, a dehumidifying drying method, a chemical drying method and the like, but these have various drawbacks.

[0004] In the hot-air drying method, since the initial moisture content varies and the high moisture content portion is scattered in the drying step, distortion and loss of water are caused in the production process, and the drying time is long before and after drying. Needed bamboo curing.

In the high frequency drying method, there is uneven distribution of the water content of the bamboo material from the beginning. When high frequency is applied to the bamboo material, a phenomenon in which radio waves pass through and concentrates on the high water content portion occurs, and the temperature unevenness of the contained water temperature occurs. However, there is a disadvantage that the water content is not uniformly reduced and the drying cost is high.

In the vacuum drying method, since heating is performed from around the bamboo material, the internal temperature varies, and the boiling temperature due to the reduced pressure in the apparatus is not that of the bamboo material itself. There were drawbacks that were not absorbed.

The dehumidification drying method is faster than natural drying, but is slower than other drying methods,
There was a drawback that high moisture content portions remained interspersed. In the chemical drying method, uniform injection of the chemical is impossible, and there are problems such as high cost and pollution.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a method for manufacturing a bamboo laminated material, which comprises employing a carbonization treatment by a carbonization apparatus and a subsequent drying step in a bamboo molding process.
It has been found that bamboo vinegar (sugar, protein, organic acid, water, etc.) is removed, the strength is increased, the firmness of the bamboo material is increased, and the expansion and contraction of the bamboo is minimized. Another object of the present invention is to prevent cracks and mold from occurring, prevent insects from entering, and improve workability such as cutting, bonding, and painting.

[0009]

In order to achieve the above object, a method for manufacturing a bamboo laminate according to the present invention employs a method for manufacturing a bamboo laminate comprising the following steps. 1. Raw bamboo with a thickness of 80 to 120 mm is cut at predetermined lengths in a direction perpendicular to the fiber direction of the bamboo. The bamboo is divided into 8 to 10 pieces in the circumferential direction, and 8 to 10 pieces are cut. 2. Peel off the blue skin on the surface and roughen the inner medulla (inner wall). As a result, the cross section is 20-32m in width.
m, a unit of bamboo piece with a predetermined length of 7 to 12 mm
obtain.

3. The plurality of bamboo pieces obtained in the above steps are dried by sun or artificially to reduce the water content to about 30%.
Let me do the following: 4. Thereafter, finish molding of the bamboo pieces is performed by a roller molding machine. 5. In the next step, the cross section has a width of 18 to 30 mm and a thickness of 5 to 1
A plurality of bamboo pieces having a finish of 0 mm are put into a hot air dryer after the carbonization treatment, and are dried with hot air. Allow to dry for 1-2 days. In this process, the water content of the bamboo piece is reduced to 1
3% or less.

6. In the next step, the thickness of the bamboo pieces is adjusted, and an adhesive is applied to the bamboo pieces. 7. The assembly of bamboo pieces to which the adhesive has been applied is flattened, joined by insect repellent treatment and high-frequency pressing, and molded into a plate shape. 8. The plate shaped in the above step is polished by a polishing machine. 9. In the next step, the plate is cut to a required width by a cutting machine. 10. Finally, a joining means such as a kerchief is molded on the side surface of the plate-shaped body cut to the required width, and finish painting is performed.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of the steps from the cutting of bamboo to the completion of lamination will be described below. 1 and 2 show the cross section of the bamboo 1 which has been cut down and which has been cut down. In this embodiment, the bamboo 1 is cut down so that the length of the bamboo 1 can be 8 m.
Shows the bamboo 1 having a thickness of 80 to 120 mm. The raw bamboo 1 is cut in a direction perpendicular to the fiber direction of the bamboo every 2 m in the length direction. 8-10 in the circumferential direction of the bamboo
Divide and cut 8-10 pieces. In the next step, as shown in FIG. 3, the blue skin 2 and the nodes on the surface are peeled off, and the medulla (inner wall) 3 on the inner surface is rough-cut. as a result,
20-32mm in width, 7-12mm in thickness, 2,000 in length
A bamboo piece of 1 mm can be obtained. The water content of the plurality of bamboo pieces 4 obtained in the above step is reduced to about 30% or less by solar drying or artificial drying.

[0013] In the drying of bamboo, the evaporation of water in the fiber direction is the main, and the evaporation of water from other sections is small. In particular, since there is almost no evaporation of water from the skin surface and the inner wall surface, the drying speed has been greatly increased by removing the cut surface and the skin surface and the inner wall surface in the previous step. Then, as shown in FIG. 4, finish molding of the bamboo piece 4 is performed by the roller molding machine 5. In the next step, as shown in FIGS.
0-32mm, thickness 7-12mm, length 2,000mm
A plurality of bamboo pieces 4 finished in
And then put into a hot air drier 7 for hot air drying. Allow to dry for 1-2 days. For example, at a drying temperature of 60 ° C., the number of drying days is two days.

The carbonization apparatus 6 used in the present invention has an inner diameter of 1,100 to 1,800 mm and a length of 9,000 to 1,000.
3,000 mm, and the throughput at one time is about 2 to 16 m ³ . In the carbonization device 6, the process of reducing the pressure and evacuating and applying the steam and the pressure is repeated. The carbonization device 6 increases the saturated vapor pressure, unifies the water content in the bamboo, and uniformly raises the temperature of the water contained therein without damaging the bamboo material. In the conventional drying method, a temperature gradient such as surface heating occurs. However, since the contained water is heated uniformly, it is possible to make the temperature even inside the bamboo. Since the contained water in the bamboo material and the temperature thereof are unified, by discharging the saturated steam in the device, the contained water is boiled uniformly, and an average dried state of the bamboo material is obtained. In this step, the water content of the bamboo piece 4 is set to 13% or less.

In the next step, as shown in FIG. 7, the thickness of the bamboo pieces is adjusted, and an adhesive is applied to the bamboo pieces 4 by the coating device 8. Further, as shown in FIG. 8, the assembly of bamboo pieces to which the adhesive has been applied is flattened and joined by insect-proof high-frequency press working of a high-frequency press machine 9 to form a plate shape. For the insect repellent treatment, a mixed gas of ethylene oxide (ethylene oxide) and carbon dioxide (10/90
VoI ratio), an extremely good insecticidal effect can be obtained. The plate shaped in the above step is polished by a polishing machine 10 as shown in FIG.

In the next step, as shown in FIG. 10, the plate is cut into a required width by a cutting machine 11. Finally, as shown in FIG. 11, a joining means 12 such as a real cutter is formed on a side surface of the plate-like body cut to a required width, and
Finish coating. As the finish coating agent, an oil-modified one-pack type polyurethane resin paint (UV paint) or an oil-modified two-pack type polyurethane resin paint is used.

The laminated bamboo material formed according to the present invention is mainly used as a building material and as a floor material for houses, offices, public facilities and the like. Furniture and Coffin
Used as Box.

[0018]

According to the present invention, bamboo is excellent in elasticity, is less likely to bend, warp or crack, and has less deformation than wood. In a method of manufacturing a bamboo laminated material using the material, a bamboo vinegar solution (sugar, raw protein, organic acid, water ) Were removed, the strength was increased, the bamboo hardness of the bamboo material was increased, and the expansion and contraction of the bamboo was further minimized. In addition, cracks and mold were prevented from occurring, insects were prevented from entering, and workability such as cutting, bonding, and painting could be improved. In addition, since bamboo, which grows fast, is used as its raw material (grows about every four years), unlike conventional laminated bamboo using wood as a resource, it is easy to recycle resources and destroy the global environment. It is extremely effective in terms of prevention. In particular, Cof
The fin box is incinerated immediately after use, and producing wood from a veneer or the like using wood grown as a resource for a long time was a waste of earth resources. The present invention has solved that.

The bamboo laminate product molded in the above process is strong and hard to be damaged, in addition to the beautiful luster of the bamboo itself.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bamboo.

FIG. 2 is a cross-sectional view of bamboo piece picking of a raw bamboo section.

FIG. 3 is a rough cross-sectional view of a bamboo piece.

FIG. 4 is a perspective view of a molded bamboo piece.

FIG. 5 is a side view of the carbonization apparatus.

FIG. 6 is a perspective view of a hot-air dryer for bamboo pieces.

FIG. 7 is a perspective view of an adhesive applied to a bamboo piece by a coating device.

FIG. 8 is a perspective view and a side view of press working of the bamboo pieces with each other by a high-frequency press working machine.

FIG. 9 is a perspective view showing polishing of a plate-like body by a polishing machine.

FIG. 10 is a perspective view showing cutting of a plate-like body by a cutting machine.

FIG. 11 is a side view of the plate-like body and a perspective view showing a finish painting on the plate-like body by a finish coating machine.

[Description of Signs] 1 Bamboo 2 Green skin 3 Medullary layer (inner wall) 4 Bamboo piece 5 Roller molding machine 6 Drying device 7 Hot air dryer 8 Painting device 9 High frequency press machine 10 Polishing machine 11 Cutting machine 12 Joining means 13 Finish painting Machine

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E04F 15/04 E04F 15/04 // A61G 17/007 B32B 9/02 B32B 9/02 A61G 17/00 M

Claims (1)

[Claims] 1. A method of manufacturing a laminated bamboo material comprising the following steps: 1. An original bamboo having a thickness of 80 to 120 mm is cut at predetermined lengths in a direction perpendicular to the fiber direction of the bamboo. The bamboo is divided into 8 to 10 pieces in the circumferential direction, and 8 to 10 pieces are cut. 2. Peel off the blue skin on the surface and roughen the inner medulla (inner wall). As a result, the cross section is 20-32m in width.
m, a unit of bamboo piece with a predetermined length of 7 to 12 mm
obtain. 3. The plurality of bamboo pieces obtained in the above process are dried by sun or artificially to reduce the water content to about 30% or less. 4. Thereafter, finish molding of the bamboo pieces is performed by a roller molding machine. 5. In the next step, the cross section has a width of 18 to 30 mm and a thickness of 5 to 1
A plurality of bamboo pieces having a finish of 0 mm are put into a hot air dryer after the carbonization treatment, and are dried with hot air. Allow to dry for 1-2 days. In this process, the water content of the bamboo piece is reduced to 1
3% or less. 6. In the next step, the thickness of the bamboo pieces is adjusted, and an adhesive is applied to the bamboo pieces. 7. The assembly of bamboo pieces to which the adhesive has been applied is flattened, joined by insect repellent treatment and high-frequency pressing, and molded into a plate shape. 8. The plate shaped in the above step is polished by a polishing machine. 9. In the next step, the plate is cut to a required width by a cutting machine. 10. Finally, a joining means such as a kerchief is molded on the side surface of the plate-shaped body cut to the required width, and finish painting is performed.