CN202685039U - A composite structure board of recombined bamboo and medium density fiberboard - Google Patents

Abstract

The utility model relates to a reorganization bamboo timber and medium density fiberboard composite construction board. The composite structure plate of the recombined bamboo wood and the medium density fiberboard consists of at least one layer of recombined bamboo wood and at least one layer of medium density fiberboard. The utility model discloses a well two kinds of production technique maturity of medium density fiberboard and reorganization bamboo timber, the continuous material of technology are as constitutional unit, through scientific design, the reorganization bamboo timber and the medium density fiberboard composite construction board that reasonable group base preparation obtained. The utility model provides a but composite sheet automatic serialization production, simple process, production efficiency height, product property can be reliable and stable, the cost advantage is obvious, energy-concerving and environment-protective, extend the use approach of reorganization bamboo timber and medium density fiberboard, improve the product added value, promote the benign development of industry.

Description

A composite structure board of recombined bamboo and medium density fiberboard

technical field

The utility model relates to a composite structure board of recombined bamboo and medium-density fiberboard, which belongs to the technical field of wood-based board manufacturing in the wood/bamboo industry.

Background technique

As a characteristic and advantageous resource in my country, bamboo has the characteristics of high strength and good toughness. It has always been considered as an ideal structural material and has been widely used, such as bamboo plywood for car floor and building formwork. However, due to the lack of dedicated automatic mechanical processing equipment, most of the processes (such as breaking bamboo strips, weaving curtains and mats, etc.) still remain in the manual production stage for a long time, and cannot form large-scale continuous production. The development of recombined bamboo products not only improves the utilization rate of raw materials, but also realizes the industrial production and application of bamboo structural materials.

Bamboo-wood composite structural panels are one of the common panel products in the wood industry at present. They are mainly prepared by compounding wood rotary-cut veneer and bamboo curtain and bamboo mat. Due to the complementary advantages of wood and bamboo, the panels show good mechanical properties. , is currently widely used. But the raw material utilization rate of wood rotary-cut veneer and bamboo screen bamboo mat is very low, and the wood rotary-cut veneer has only about 60% of the output rate, and the bamboo screen and bamboo mat plywood output rate is even lower than 50%. And whether it is unit processing or plate making, the processing technology is relatively complicated, labor-intensive, and the quality controllability is not high. Therefore, problems such as improving the yield rate, reducing waste, simplifying the process, and ensuring stable product performance need to be solved urgently.

As a product that effectively utilizes wood resources, fiberboard not only has the original physical and mechanical properties of wood, but also overcomes the natural defects of wood, so it has a wide range of uses and is a good material for furniture, packaging, vehicles, buildings, ships, etc. The horizontal and vertical strength of wood or bamboo differs by several times or ten times, while the fiberboard has uniform fiber distribution, the difference in the product’s horizontal and vertical strength does not exceed 10%, and the vertical and horizontal drying shrinkage of the fiberboard has small changes and good dimensional stability. Especially medium density fiberboard, the density is close to natural wood, the surface is smooth and smooth, which is convenient for machining and decorative decoration, and its output is relatively high in our country. Therefore, if MDF and recombined bamboo can be combined to manufacture new structural panels, it will not only improve the strength-to-weight ratio of the board through the complementary properties of bamboo and wood fibers, but also expand the scope of application of MDF, and promote the recombination of bamboo and MDF. Continued product development. Composite board products can be used as medium-to-high-end building materials for the manufacture of high-end building clear water formwork and small and medium-sized structural components (such as doors and windows, indoor and outdoor floors, stairs, cladding panels, etc.), to meet the needs of the structural material market.

Utility model content

In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a composite structure board. A new type of composite structure board is obtained by combining recombined bamboo and medium density fiberboard, which has good mechanical properties and can adapt to the requirements of different uses. .

In order to achieve the above purpose, the utility model provides a composite structural board of recombined bamboo and medium density fiberboard, which is composed of at least one layer of recombined bamboo and at least one layer of medium density fiberboard.

According to the specific technical solution of the present utility model, preferably, the thickness of the above-mentioned recombined bamboo and medium density fiberboard composite structural board is 7-90mm.

According to the specific technical solution of the present utility model, preferably, the above-mentioned recombined bamboo and medium density fiberboard composite structural board is composed of one layer of medium density fiberboard and two layers of recombined bamboo, wherein the two layers of recombined bamboo are respectively located on the two sides of the medium density fiberboard. . Medium density fiberboard is used as the core layer, and reconstituted bamboo is used as the skin layer.

According to the specific technical solution of the present invention, preferably, the above-mentioned recombined bamboo and medium density fiberboard composite structural board is composed of one layer of restructured bamboo and two layers of medium density fiberboard, wherein the two layers of medium density fiberboard are respectively located on the two sides of the restructured bamboo. . Reconstituted bamboo is used as the core and MDF as the skin.

According to the specific technical solution of the present invention, preferably, the above-mentioned recombined bamboo and medium density fiberboard composite structural board includes more than two structural units consisting of one layer of recombined bamboo and one layer of medium density fiberboard. These structural units are glued together in multiple layers.

The above-mentioned recombined bamboo and medium density fiberboard composite structural board provided by the utility model can be obtained by sizing, forming blanks, cold pressing, and curing, for example, it can be manufactured through the following steps:

Coating weather-resistant glue on both sides or one side of the contact surface between recombined bamboo and medium density fiberboard;

Assembling the recombined bamboo material coated with weather-resistant glue and medium density fiberboard to obtain a slab;

Press the slab, and after the pressing is completed, step down the pressure to release the pressure;

After the pressure is relieved, health preservation is carried out to obtain a composite structural board of recombined bamboo and medium density fiberboard.

The utility model selects medium-density fiberboard with uniform material, small vertical and horizontal strength difference, not easy to crack, and can be easily surface decorated, and has excellent anti-ultraviolet performance, and its elastic modulus, compressive strength, and low-temperature anti-freeze storage performance are all better than The recombined bamboo of various tropical rainforest broad-leaved hardwoods and East African hardwoods is used as raw materials, and the prepared recombined bamboo and medium density fiberboard composite structural panels can be used as medium and high-grade building materials for the manufacture of high-grade building formwork and small and medium-sized structural components (such as doors, windows, Indoor and outdoor floors, stairs, sheathing panels, etc.).

The technical scheme of the utility model uses recombined bamboo and medium-density fiberboard to prepare composite structural boards. On the one hand, it can expand the utilization of bamboo and wood resources and increase the added value of products; Composite preparation of structural boards with medium-density fiberboards is to combine structural units with a specific thickness with a small number of layers to obtain excellent structural properties, which can realize industrial continuous production, greatly improve production efficiency, reduce production costs, and expand products. scope and field of use.

The recombined bamboo and medium density fiberboard composite structural board provided by the utility model has the following advantages:

1. The utility model adopts recombined bamboo and medium-density fiberboard, two kinds of materials with mature production technology and continuous process, as structural units, and the recombined bamboo and medium-density fiberboard composite structural board prepared by scientific design, reasonable formation and cold pressing does not need Dry raw materials, simplify the process, combine two structural units with specific thickness in fewer layers, controllable product performance and high production efficiency;

2. The physical and mechanical strength indicators of the recombined bamboo and medium density fiberboard composite structural panels provided by the utility model can meet the relevant standards for structural panels such as building doors and windows, formwork, cladding panels and floors at home and abroad;

3. The recombined bamboo and medium-density fiberboard composite structural board provided by the utility model has a wide range of applications, which not only effectively drives the value-added utilization of bamboo resources, improves the utilization rate of raw materials, but also adds a utilization path for my country's medium-density fiberboard. Increased application value;

4. The manufacturing method of the recombined bamboo and medium-density fiberboard composite structural board provided by the utility model is simple and efficient, and the energy-saving effect is remarkable. In the actual industrialization process, the technical transformation cost is low, and the product cost is controllable and greatly reduced. Reduce the cost of container flooring made of cloned wood by about 20%;

5. The recombined bamboo and medium-density fiberboard composite structural board provided by the utility model can be used to prepare indoor and outdoor small and medium-sized building components, such as doors and windows, floors and stairs, etc., and can make full use of the high strength and excellent outdoor performance of recombined bamboo. As well as the good impact resistance and easy processability of fiberboard, it can replace metal/fossil derivatives such as plastic steel and aluminum alloy, which has a positive impact on reducing global carbon emissions.

Description of drawings

The following drawings are only intended to illustrate and explain the utility model schematically, and do not limit the scope of the utility model. in:

Fig. 1 is the schematic structural representation of the composite structure plate that embodiment 1 provides;

Fig. 2 is the structural schematic diagram of the composite structure panel that embodiment 2 and 3 provide;

FIG. 3 is a schematic structural view of the composite structural panel provided in Example 4. FIG.

Explanation of main figures and symbols:

MDF1 Reconstituted Bamboo2

Detailed ways

In order to have a clearer understanding of the technical features, purpose and beneficial effects of the present utility model, the technical solution of the present utility model is described in detail below with reference to the accompanying drawings, but it should not be construed as limiting the scope of implementation of the present utility model.

Example 1

This embodiment provides a composite structural panel of recombined bamboo and medium density fiberboard, which can be used to manufacture doors and windows (such as double-layered doors and windows), and the structure is shown in FIG. 1 . The boards used in the composite structure board are medium density fiberboard 1 produced from wood fiber (single tree species or mixed tree species with similar properties) and recombined bamboo material 2 obtained by dipping and molding bamboo tow (Moso bamboo or Ci bamboo).

The structure of the composite structural board provided in this embodiment is based on recombined bamboo 2, and the upper layer is glued with a medium density fiberboard 1 coated with isocyanate glue on one side, which is manufactured according to the following steps:

Material selection: use medium density fiberboard with a thickness of 20mm and 25mm, with a density of 0.75g/cm ³ and a moisture content of 8%; use reconstituted bamboo with a density of 1.05g/cm ³ and a moisture content of 10%, and sand it to a thickness of 15mm , 20mm, 25mm;

Glue sizing: apply isocyanate glue on one side of the medium density fiberboard and recombined bamboo, and the amount of glue applied is 130g/m ² ;

Blank assembly: combine recombined bamboo and medium density fiberboard together to obtain three different slabs. The total thickness of the slabs is controlled to 35mm (20mm thick medium density fiberboard + 15mm thick recombined bamboo), 40mm (20mm thick medium density fiberboard + 20mm thick recombined bamboo) and 50mm (25mm thick medium density fiberboard + 25mm thick recombined bamboo), and the thickness deviation is ± 1mm;

Pressure application: Press the slab under the unit pressure condition of 1.2MPa, hold the pressure for 2 hours, release the pressure directly after the pressing is completed, and then keep it healthy for 24 hours;

After aging, surface treatment, grading, and testing of the cured slabs, the recombined bamboo and medium density fiberboard composite structural boards are obtained, and their physical and mechanical properties are as follows:

Moisture content: ≤10%

Bend along: ≤1.5‰

Distortion, diagonal difference: ≤1.5mm

Bonding strength: ≥0.5MPa

Shear strength along the grain of glue seam (longitudinal): ≥8.0N/mm ²

The test of the above parameters is carried out according to the method in the "Building Wooden Doors and Windows" (JG/T122-2000) standard, and all parameters meet the index requirements.

The recombined bamboo and medium-density fiberboard composite structural board provided in this embodiment is suitable for manufacturing double-layer structure doors and windows, and the recombined bamboo layer with excellent natural durability can be used as the outside of the door and window to play the role of main frame support and directly contact with the outdoor environment; As the inner side of doors and windows, medium density fiberboard can be placed in the indoor environment. It can not only use its good surface processing performance to enhance the interior decoration effect with various surface shapes, but also reduce the weight of doors and windows and reduce the cost of raw materials.

Example 2

This embodiment provides a composite structural board of recombined bamboo and medium density fiberboard, which can be used to manufacture floors, and its structure is shown in FIG. 2 . The boards used in the composite board are medium density fiberboard 1 produced from wood fiber (single tree species or mixed tree species with similar properties) and recombined bamboo material 2 obtained by dipping and molding bamboo tow (Moso bamboo or Ci bamboo).

The structure of the composite structure board provided by this embodiment is a medium density fiberboard 1 coated with isocyanate glue on both sides as the core layer, and a layer of recombined bamboo 2 coated with isocyanate glue on one side is glued to the top and bottom of it. It is manufactured according to the following steps of:

Material selection: use 9mm thick medium density fiberboard with a density of 0.75g/cm ³ and a moisture content of 8%; select reconstituted bamboo with a density of 1.05g/cm ³ and a moisture content of 10%, and sand it to a thickness of 3mm;

Glue sizing: apply isocyanate glue on both sides of one layer of medium density fiberboard, and apply isocyanate glue on one side of two layers of reconstituted bamboo respectively, the amount of glue applied is 130g/m ² ;

Blank assembly: use double-sided glued medium density fiberboard as the core layer, and two layers of single-sided glued reconstituted bamboo surface layer to form blanks to obtain slabs. The total thickness of the slabs is controlled at 15mm, and the thickness deviation is ±0.5mm;

Pressure application: The slab is pressed under the pressure condition of 1.2MPa, and the holding time is 2 hours. After the pressing is completed, the pressure is released directly, and then the health is maintained for 24 hours.

After aging, surface treatment, grading, and testing of the cured slabs, the recombined bamboo and medium density fiberboard composite structural boards are obtained, and their physical and mechanical properties are as follows:

Moisture content: 4% to 16%

Coefficient of wet friction: 0.3～0.8

Bending load after cyclic treatment: ≥220N

The detection of the above parameters is carried out according to the standard of LY/T 1861-2009 "wooden floor for outdoor use". Reconstituted bamboo can be widely used for flooring due to its excellent durability, strength, and low shrinkage and expansion rate. In this example, medium-density fiberboard with soft material and low density is composited with recombined bamboo, and the composite structural board obtained is suitable for making bamboo-wood composite flooring. It can effectively reduce the density of floor substrates while meeting product standard requirements, and reduce the cost.

Example 3

This embodiment provides a composite structural panel of recombined bamboo and medium density fiberboard, which can be used to manufacture building formwork, the structure of which is shown in Figure 2. The boards used in the composite structure board are medium density fiberboard 1 produced from wood fiber (single tree species or mixed tree species with similar properties) and recombined bamboo material 2 obtained by dipping and molding bamboo tow (Moso bamboo or Ci bamboo).

The structure of the composite structure board provided by this embodiment is a medium density fiberboard 1 coated with isocyanate glue on both sides as the core layer, and a layer of recombined bamboo 2 coated with isocyanate glue on one side is glued to the top and bottom of it. It is manufactured according to the following steps of:

Material selection: use 10mm thick medium density fiberboard with a density of 0.75g/cm ³ and a moisture content of 8%; use reconstituted bamboo with a density of 1.05g/cm ³ and a moisture content of 10%, and sand it to a thickness of 4mm;

Glue sizing: apply isocyanate glue on both sides of one layer of medium density fiberboard, and apply isocyanate glue on one side of two layers of reconstituted bamboo respectively, the amount of glue applied is 130g/m ² ;

Blank assembly: use double-sided glued medium density fiberboard as the core layer, and two layers of single-sided glued reconstituted bamboo surface layer to form three different slabs. The thickness of the slabs is controlled to be 18mm, and the thickness deviation is ± 0.8mm;

Pressure application: Press the slab under the pressure condition of 1.2MPa, hold the pressure for 2 hours, release the pressure directly after the pressing is completed, and then keep it healthy for 24 hours;

After aging, surface treatment, grading, and testing of the cured slabs, a composite structural panel of recombined bamboo and medium density fiberboard is obtained, and its physical and mechanical properties are as follows:

Moisture content: 5%～12%

MOR//: ≥100MPa

MOR⊥: ≥50MPa

MOE//: ≥8000MPa

MOE⊥: ≥4000MPa

The detection of the above parameters can be carried out according to the method in "Bamboo Plywood for Concrete Formwork" (LY/T 1574-2000), and all parameters can meet the requirements of the above standards.

Example 4

This embodiment provides a composite structural panel of recombined bamboo and medium density fiberboard, which can be used to manufacture cladding panels and stair components of wooden structures. The structure is shown in Figure 3 . The boards used in the composite structure board are medium density fiberboard 1 produced from wood fiber (single tree species or mixed tree species with similar properties) and recombined bamboo material 2 obtained by dipping and molding bamboo tow (Moso bamboo or Ci bamboo).

The structure of the composite structural board provided by this embodiment is to use the recombined bamboo material 2 coated with isocyanate glue on both sides as the core layer, and then glue a layer of medium density fiberboard 1 coated on one side with isocyanate glue on the upper and lower sides. It is manufactured according to the following steps of:

Material selection: use 6mm thick medium density fiberboard with a density of 0.75g/cm ³ and a moisture content of 8%; select reconstituted bamboo with a density of 1.05g/cm ³ and a moisture content of 10%, and sand it to a thickness of 6mm;

Glue sizing: apply isocyanate glue on both sides of a layer of reconstituted bamboo, and apply isocyanate glue on one side of two layers of medium density fiberboard respectively. The amount of glue applied is 125g/m ² ;

Blank assembly: use double-sided glued recombined bamboo as the core layer, and two layers of single-sided glued medium density fiberboard as the blank to obtain four different slabs. The thickness of the slabs is controlled to be 18mm, and the thickness deviation is ± 0.5mm;

Pressure application: Press the slab under the pressure condition of 1.2MPa, hold the pressure for 2 hours, release the pressure directly after the pressing is completed, and maintain the health for 24 hours;

After aging, surface treatment, grading, and testing of the cured slabs, the recombined bamboo and medium density fiberboard composite structural boards are obtained, and their physical and mechanical properties are as follows:

Moisture content: 5%～13%

MOR//: ≥90MPa

MOR⊥: ≥40MPa

MOE//: ≥7000MPa

MOE⊥: ≥3000MPa

Horizontal shear strength: ≥3MPa

Formaldehyde release limit: ≤1.5mg/L

Concentrated static load: ≥1.8kN

Impact load: ≥120N·m

Minimum ultimate load under uniform load: ≥13kPa

Maximum deflection under uniform load: ≤2.4mm

The above parameters can be tested in accordance with "Bamboo-Wood Composite Panels for Structures" (GB/T21128-2007), "Code for Construction Quality Acceptance of Wooden Structure Engineering" (GB50206-2002) and "Methods in Standards for Wooden Structure Test Methods" (GB/T21128-2007). T50329-2002), and all parameters can meet the requirements of the above-mentioned standards.

The recombined bamboo and medium-density fiberboard composite structural board provided in this embodiment is suitable for preparing parts such as wood structure building cladding panels and stair treads. Effectively enhance the impact toughness of wall panels and stairs; on the other hand, using MDF as a panel reduces the surface hardness of the board. Compared with pure bamboo boards, it is not only easier to nail, but also reduces the hardness of the board to a certain extent. Weight and cost of raw materials.

Claims (5)

1. a recombining bamboo and medium density fibre board (MDF) composite construction board is characterized in that, this recombining bamboo and medium density fibre board (MDF) composite construction board by one deck recombining bamboo at least and at least one deck medium density fibre board (MDF) form.

2. recombining bamboo according to claim 1 and medium density fibre board (MDF) composite construction board is characterized in that, the thickness of this recombining bamboo and medium density fibre board (MDF) composite construction board is 7～90mm.

3. recombining bamboo according to claim 1 and medium density fibre board (MDF) composite construction board, it is characterized in that, this recombining bamboo and medium density fibre board (MDF) composite construction board are comprised of one deck medium density fibre board (MDF) and two-layer recombining bamboo, wherein, two-layer described recombining bamboo lays respectively at the both side surface of described medium density fibre board (MDF).

4. recombining bamboo according to claim 1 and medium density fibre board (MDF) composite construction board, it is characterized in that, this recombining bamboo and medium density fibre board (MDF) composite construction board are comprised of one deck recombining bamboo and two-layer medium density fibre board (MDF), wherein, two-layer described medium density fibre board (MDF) lays respectively at the both side surface of described recombining bamboo.

5. recombining bamboo according to claim 1 and medium density fibre board (MDF) composite construction board, it is characterized in that this recombining bamboo and medium density fibre board (MDF) composite construction board comprise the plural construction unit that is comprised of one deck recombining bamboo and one deck medium density fibre board (MDF).

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