CN108000646B

CN108000646B - Method for manufacturing recombined bamboo product

Info

Publication number: CN108000646B
Application number: CN201711183668.4A
Authority: CN
Inventors: 贾艳刚; 王飞; 刘海洋; 罗韬
Original assignee: Nanjing Green New Energy Research Institute Co ltd
Current assignee: Nanjing Green New Energy Research Institute Co ltd
Priority date: 2017-11-23
Filing date: 2017-11-23
Publication date: 2023-04-28
Anticipated expiration: 2037-11-23
Also published as: CN108000646A

Abstract

The invention discloses a method for manufacturing a recombined bamboo product, which is made of bamboo materials, wherein the local density of the section of the recombined bamboo product is high, the local part of the section of the recombined bamboo product is loose, and two areas of the local density and the local loose are continued in the direction of the vertical cross section of the bamboo product; wherein the localized regions of high local density are produced without pressure or with relatively low pressure and the localized regions of high local density are produced with relatively high pressure; the reconstituted bamboo article comprises at least one region of high local density and one region of partial loosening. The preparation method comprises the following process steps: a) Braiding, drying and dipping of the bamboo curtain; b) Layer-by-layer width fixing and assembling; c) And (5) forming and blank making.

Description

Method for manufacturing recombined bamboo product

Technical Field

The invention relates to the technical field of processing of recombined bamboo and wood, in particular to a bamboo (wood) material for a structure, and relates to a processing and manufacturing method of recombined bamboo profiles.

Background

China is the most abundant world of bamboo resources. In recent years, along with the shortage of wood resources in the world, the reasonable and effective utilization of wood and bamboo resources is becoming more and more important.

In the prior art, the main recombined bamboo technology used in the fields of construction, decoration and the like is as follows: (1) bamboo strip recombination technology: processing bamboo into thick bamboo strips, and independently or additionally combing wood bundles and a proper amount of veneer strips, drying until the water content is 8-15%, and gluing with phenolic resin. (2) bamboo fiber reinforced composite material manufacturing technology: fluffing bamboo wood into loose net-shaped fiber bundles which are long and cross-linked with each other and keep the original arrangement mode of fibers, and then drying, sizing, assembling and forming, and hot-pressing to obtain the plate-shaped material. (3) bamboo square recombined bamboo technology: splitting hollow bamboo into arc-shaped bamboo blanks, processing the bamboo blanks into square bamboo strips with certain specification, and gluing the square bamboo strips together to form a bamboo board or a bamboo square. (4) small diameter bamboo recombination technology: and rubbing the small-diameter bamboo materials into bamboo bundles, and recombining and gluing the bamboo bundles to form a bamboo board or a bamboo square.

The recombined bamboo has excellent physical and mechanical properties of high strength, large hardness, small deformation, good rigidity, high nail holding power and the like. Can be widely applied to a plurality of fields. If the characteristics of high strength, large hardness and good dimensional stability of the recombined bamboo are utilized, the recombined bamboo is used as a container floor. The recombined bamboo can be cut off, shaved, routed, surface decorated and the like to be manufactured into recombined bamboo furniture of various types and structures. The recombined bamboo can be processed into various house structure frames by processing into rectangular materials.

The method has the advantages that the size and the length of the recombined bamboo manufactured by the existing method are certain, the requirements on different lengths are difficult to meet, and although a hot-pressing recombined bamboo technology for producing any length by adopting a continuous press is also prepared, the technology has the defects of high manufacturing cost, high production difficulty, general production efficiency and the like.

At present, the processing technology of the recombined bamboo is all solid recombined bamboo, and no report and products of pressed and formed sectional materials are found. The problems of excessive performance, too high density and high cost of the recombined bamboo can be solved by using the recombined bamboo profile.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a recombined bamboo product and a manufacturing method thereof.

The technical solution of the invention is as follows:

a recombined bamboo product is made of bamboo materials, the cross section of the recombined bamboo product is high in local density and loose locally, and the two areas of the high local density and the loose locally are continued in the cross section direction of the bamboo product; wherein the localized regions of loosening are made without pressure or with relatively low pressure and the localized regions of high density are made with relatively high pressure; the reconstituted bamboo article comprises at least one region of high local density and one region of partial loosening.

The area with high local density is a dense area; the local loose areas can be bent or folded and connected and can be used for connecting different parts, so that the needed bamboo profile is manufactured.

The manufacturing method of the recombined bamboo product comprises the following steps: the method comprises the following process steps: a) Braiding, drying and dipping of the bamboo curtain; b) Layer-by-layer width fixing and assembling; c) And (5) forming and blank making.

In step a), the braiding/drying/dipping of the bamboo curtain comprises the following steps: drying the bamboo curtain until the water content is 6-15%, dipping by using an adhesive, and removing water until the water content is 10-20% after draining; the bamboo curtain is formed by connecting bamboo materials with thickness deviation within +/-3 mm; the assembled bamboo materials of the bamboo curtain are assembled and woven according to the direction of the grain.

The bamboo material connection is braiding, stitching or glue line; the bamboo curtain can be dried and then impregnated and woven, or the bamboo curtain can be impregnated and woven and then dried.

In the step b), the layer-by-layer fixed-width assembly comprises:

1) Metering the weight and the number of layers of the impregnated and dried bamboo curtain according to the thickness;

2) Parallel assembly is carried out between layers, the included angle between the bamboo curtains is 20-90 degrees, and paving is carried out layer by layer according to the set layer number;

each layer of bamboo curtain is paved by adopting any one of lap joint/miter joint/blank joint for front and rear bamboo curtains;

the distance between the transverse seams of two adjacent layers of bamboo curtains is more than 200mm.

When lap joint/oblique joint is adopted, the overlapping distance between the front and back rolling layers is 2-100mm.

In the step c), the forming blank comprises the following steps:

1) Pressing and forming the partial area of the front section of the blank prepared in the step b) by pressure according to the requirement; when in pressing, the adjusting pressure is relatively larger to form a local high-density area, and the adjusting pressure is relatively smaller to form two local loose areas;

2) Feeding forward, and assembling the subsequent parts according to the step b);

further comprising a chopping step, before or after the press forming of step 1).

The bamboo product can be prepared from bamboo, wood bundles, wood single-board strips and plant straw unit materials, or prepared by mixing the above materials; metallic or non-metallic mesh-like continuous curtain materials can also be added in the preparation.

The bamboo profile with any length of U-shaped, round, tubular, rectangular or C-shaped can be processed according to the subsequent requirements.

By adopting the technology to improve the existing recombined bamboo technology, recombined bamboo with any length can be obtained, the yield can be improved as a building structure material, automatic continuous production is promoted, and great help is provided for improving the production efficiency.

The semi-finished product is manufactured and molded by using a thermosetting adhesive to form a local compact area and a local loose area, and is subjected to sleeve mold heat curing after being subjected to secondary molding and connection. When a ring connection is required, the two loose areas overlap and merge. Localized loosening area bending is used when bending is desired.

The invention has the advantages that: a method of making a recombinant bamboo profile is provided. The utilization of various small-diameter bamboos is increased on the basis of using the existing materials, and the utilization rate is improved. The method can also be expanded to be used in straw materials. The recombined bamboo with any length can be obtained by cold pressing the recombined bamboo with any length, and the production of the recombined bamboo with any length is possible for being used as building materials to improve the yield.

In summary, the invention has the following beneficial effects:

1. the intermediate product is assembled and then combined into a section bar, so that the uniformity is good and the quality is more stable;

2. as intermediate products, the intermediate products can be combined into various profiles through the procedures of bonding, bending, pressing, solidifying and the like in the later period;

3. as an intermediate product, the profile manufactured in the later stage has strong integrity, each profile is formed by one-time compression molding, and the two-time processing combination is performed in the unordered later stage;

4. as an intermediate product, the processing equipment is simple, and the batch continuous production is easy.

Drawings

Fig. 1: the cross-section schematic diagram of the recombined bamboo product, namely the bending connection area, is mixed.

Fig. 2: schematic cross section of the recombined bamboo product-connection area.

Fig. 3: schematic cross section of the recombined bamboo product-bending area.

Detailed Description

A method for manufacturing recombined bamboo with any length is characterized by comprising the following process steps: a) Braiding, drying and dipping of the bamboo curtain; b) Layer-by-layer width fixing and assembling; c) And (5) forming and blank making.

The following technical scheme is adopted:

example-parallel assembly of adjacent layers of bamboo fibers

Step 1, weaving/drying/gum dipping of a bamboo curtain:

drying the woven bamboo curtain with the width of 2000mm at 50-150 ℃ and controlling the water content at 5-15%. The temperature is selected according to different materials and environmental temperature, and too high temperature can carbonize to influence mechanical strength and too low temperature can influence drying efficiency.

The adhesive is phenolic resin or other adhesive with equivalent performance, the gum dipping amount is 3-20%, and the percentage is the ratio of the absolute dry weight of the resin to the absolute dry weight of the bamboo unit; drying or aging until the water content is 10-15%.

Step 2 layer by layer width fixing assembly

According to the set density, the thickness and the type of each layer of bamboo curtain are measured. Cutting the dried bamboo curtain into bamboo curtain sheets with the width of 150mm perpendicular to the grain direction of the bamboo; the cut 150mm bamboo curtain sheet is cut into two parts from the middle part, and each part is 1000mm. And assembling on a paving table, wherein the first layer is paved with a whole section of bamboo curtain, the second layer is paved with a half section of bamboo curtain, and the width directions of the first layer and the second layer are completely overlapped. And paving a third layer and a fourth layer in the thickness direction in sequence according to the same paving, and paving a whole bamboo curtain in sequence after the first layer and the second layer, wherein the initial ends of the layers are aligned. After the paving is finished, the four layers of the bamboo curtains are sequentially and continuously lengthened and paved, the front and the back are lapped for 5mm, and the continuous paving in the length direction is completed.

Step 3, forming and blank making

And (3) conveying the blank front section assembled in the step (2) into a pressing die cavity, and applying pressure at the position 50mm in the middle of the blank to form the assembled blank to a preset thickness. And opening the press, continuously feeding forward, and cutting according to a section with the length of 3000mm to obtain the recombined bamboo product.

Example two adjacent layers of bamboo fiber 90 degree assembled

Step 1, weaving/drying/gum dipping of a bamboo curtain:

drying the woven bamboo curtain at 50-150 ℃ and controlling the water content at 5-15%. The temperature is selected according to different materials and environmental temperature, and too high temperature can carbonize to influence mechanical strength and too low temperature can influence drying efficiency.

The adhesive is phenolic resin or other adhesives with equivalent performance, the gum dipping amount is 6 percent, and the percentage is the ratio of the absolute dry weight of the resin to the absolute dry weight of the bamboo unit; and drying or aging until the water content is 10-15%.

Step 2 layer by layer width fixing assembly

According to the set density, the thickness and the type of each layer of bamboo curtain are measured. Cutting the dried bamboo curtain into bamboo curtain sheets A with the width of 140mm perpendicular to the grain direction of the bamboo; the bamboo curtain roll is cut into a section of bamboo curtain B of 140mm along the fiber direction. And assembling on a paving table, wherein the first layer is paved with a section of bamboo curtain A, the second layer is paved with a bamboo curtain B, and the width directions of the first layer and the second layer are completely overlapped. Paving a third layer and a fourth layer in the thickness direction in the same mode sequentially, and paving a whole bamboo curtain in turn after the first layer and the second layer, wherein the initial ends of the layers are aligned. The fifth layer is paved in the same way as the first layer. After the paving is finished, the 4 layers are sequentially and continuously lengthened to pave the whole bamboo curtain, and the space between the front bamboo curtain and the rear bamboo curtain of the same layer is 5mm, so that the continuous paving in the length direction is completed. So that the directions of two adjacent layers of fibers are mutually perpendicular.

Step 3, forming and blank making

And (3) conveying the blank front section assembled in the step (2) into a pressing die cavity, and applying pressure at the position of 70mm at one end of the width of the blank to form the assembled blank to a preset thickness. And opening the press, continuously feeding forward, and cutting according to a section with the length of 3000mm to obtain the recombined bamboo product.

Example three-phase adjacent layer bamboo fiber 45 degree angle assembly

Cutting the dried bamboo curtain in the second embodiment into bamboo curtain C with the width of 140mm according to the angle of 45 degrees with the direction of the bamboo fibers, and replacing the bamboo curtain A in the step 2 in the second embodiment with a bamboo curtain C assembly. The remaining steps are the same. The 45-degree included angle between the fiber directions of the adjacent layers is manufactured.

Example four terminal Loose zone as connection zone

Step 1, weaving/drying/gum dipping of a bamboo curtain:

Step 2 layer by layer width fixing assembly

According to the set density, the thickness and the type of each layer of bamboo curtain are measured. Cutting the dried bamboo curtain into bamboo curtain sheets A with the width of 50mm perpendicular to the grain direction of the bamboo; the bamboo curtain roll is cut into a section of bamboo curtain B of 140mm along the fiber direction. And assembling on a paving table, wherein the first layer is paved with a section of bamboo curtain A, and the bamboo curtain A is placed in the middle along the width direction. And the second layer is paved with a bamboo curtain B, and the width directions of the first layer and the second layer are completely overlapped. Paving a third layer and a fourth layer in the thickness direction in the same mode sequentially, and paving a whole bamboo curtain in turn after the first layer and the second layer, wherein the initial ends of the layers are aligned. The fifth layer is paved in the same way as the first layer. After the paving is finished, the 4 layers are sequentially and continuously lengthened to pave the whole bamboo curtain, and the space between the front bamboo curtain and the rear bamboo curtain of the same layer is 5mm, so that the continuous paving in the length direction is completed. So that the directions of two adjacent layers of fibers are mutually perpendicular.

Step 3, forming and blank making

The present invention is not limited to the preferred embodiments, and any simple modification, equivalent replacement, and improvement made to the above embodiments by those skilled in the art without departing from the technical scope of the present invention, will fall within the scope of the present invention.

Claims

1. A method of manufacturing a reconstituted bamboo article, characterized by: the bamboo material is adopted to be made, the local density of the section is high, the local loosening is carried out, and the two areas of the local density and the local loosening are continued in the cross section direction of the bamboo product; wherein the localized regions of loosening are made without pressure or with relatively low pressure and the localized regions of high density are made with relatively high pressure; the recombined bamboo product at least comprises a local high-density area and a local loose area; the area with high local density is a dense area; the local loose areas can be bent or folded and connected and can be used for connecting different parts, so that the needed bamboo profile is processed; the manufacturing method comprises the following process steps: a) Braiding, drying and dipping of the bamboo curtain; b) Layer-by-layer width fixing and assembling; c) Forming and blanking;

in the step b), the layer-by-layer fixed-width assembly comprises:

2) Parallel assembly is carried out between layers, the included angle between the bamboo curtains is 20-90 degrees, and paving is carried out layer by layer according to the set layer number; each layer of bamboo curtain is paved by adopting any one of lap joint/miter joint/blank joint for front and rear bamboo curtains;

the distance between the transverse seams of two adjacent layers of bamboo curtains is more than 200mm;

in the step c), the forming blank comprises the following steps:

2. A method of manufacturing a reconstituted bamboo article according to claim 1, wherein: in step a), the braiding/drying/dipping of the bamboo curtain comprises the following steps: drying the bamboo curtain until the water content is 6-15%, dipping by using an adhesive, and removing water until the water content is 10-15% after draining; the bamboo curtain is formed by connecting bamboo materials with thickness deviation within +/-3 mm; the assembled bamboo materials of the bamboo curtain are assembled and woven according to the direction of the grain.

3. A method of manufacturing a reconstituted bamboo article according to claim 2, wherein: the bamboo material connection is braiding, stitching or glue line; the method comprises the steps of drying the bamboo curtain and then dipping and braiding, or dipping and braiding the bamboo curtain and then drying.

4. A method of manufacturing a reconstituted bamboo article according to claim 1, wherein: when lap joint/oblique joint is adopted, the overlapping distance between the front and back rolling layers is 2-100mm.

5. A method of manufacturing a reconstituted bamboo article according to claim 1, wherein: the bamboo product can be prepared from bamboo, wood bundles, wood single-board strips and plant straw unit materials, or prepared by mixing the bamboo, the wood bundles, the wood single-board strips and the plant straw unit materials; metallic or non-metallic mesh-like continuous curtain materials can also be added in the preparation.

6. A method of manufacturing a reconstituted bamboo article according to claim 1, wherein: the bamboo profile with any length of U-shaped, round, tubular, rectangular or C-shaped can be processed according to the subsequent requirements.