Bamboo excess material fiber reinforced plate rolling forming production process

Abstract

The invention relates to the field of bamboo fiber board production, in particular to a bamboo excess material fiber reinforced board rolling forming production process which comprises the following steps: S1, treating a bamboo excess material fiber raw material and a cement raw material; s2, ingredient design is carried out, the fiber content of the bamboo residues is 10%, the fiber length of the bamboo residues is 1-2 cm, the water-cement ratio is 0.4, and the addition amount of a flame retardant is 2%; s3, weighing according to the ingredients, and uniformly dry-mixing the cement, the flame retardant and the bamboo residue fibers; s4, adding water, uniformly stirring, and carrying out roll forming; and S5, naturally cooling to room temperature, and then curing. According to the invention, by comprehensively designing proportioning parameters, the flame retardance, the strength and the heat insulation performance can be well balanced, the bamboo excess material fiber reinforced plate with good use performance is obtained, judgment through experience is not needed, and the consistency of products can be ensured.

Description

Technical Field

[0001] The invention relates to the technical field of bamboo fiber board production, in particular to a production process of roller-forming a bamboo waste fiber reinforced board. Background Art

[0002] Boards made from a mixture of bamboo fiber and cement have obvious improvements in light weight, high strength or thermal insulation performance. However, in existing production processes, most of the mixed molding is based on experience, and it is difficult to comprehensively balance the three properties of density, strength and thermal insulation. The products produced often have poor effects in one aspect.

[0003] The Chinese patent with publication number CN116947390A discloses a method for preparing bamboo waste fiber reinforced cement decorative board, which includes the following steps: S1, sorting bamboo waste of different materials, drying and storing them in categories; S2, preparing bamboo waste into bamboo fiber by physical or chemical methods; S3, mixing cement, different types of bamboo waste fibers mixed according to a ratio, water, and additives according to a certain proportion and stirring them fully; S4, forming: filling the mixed slurry into the board mold; S5, removing the mold, taking out the board, curing it for 24 hours and trimming it to ensure the flatness of the decorative surface. The invention is conducive to the efficient use of bamboo materials, reducing solid waste in the production process, and effectively avoiding the fire hazards caused by scattered stacking and disorderly treatment.

[0004] However, the above-mentioned disclosed solutions have the following shortcomings: there is a lack of detailed parameter ratios to achieve the three properties of flame retardancy, strength and heat insulation, and the quality of the produced fiber cement board needs to be improved. Summary of the invention

[0005] The purpose of the present invention is to propose a production process for roller-forming a bamboo waste fiber reinforced plate in view of the problem that the background technology is produced based on past experience and lacks detailed parameter ratios to balance the three properties of flame retardancy, strength and heat insulation.

[0006] The technical solution of the present invention is a production process for roll-forming a bamboo waste fiber reinforced plate, comprising the following steps:

[0007] S1. Processing bamboo waste fiber raw materials and cement raw materials;

[0008] S2, ingredient design, bamboo fiber content 10%, bamboo fiber length 1-2cm, water-cement ratio 0.4, flame retardant addition 2%;

[0009] S3, weighing the ingredients and dry-mixing the cement, flame retardant and bamboo fiber residue evenly;

[0010] S4, adding water, stirring evenly and then rolling to form;

[0011] S5. Cool naturally to room temperature and then carry out curing.

[0012] Preferably, in S1, the bamboo fibers are cut and crushed by high-speed airflow; and the cement is sulphoaluminate cement.

[0013] Preferably, in S2, the flame retardant is ammonium phosphate, magnesium carbonate or bentonite.

[0014] Preferably, in S4, the roller forming is sequentially performed by pre-pressing with a pre-pressing roller, forming with a forming roller and pressing with a pressure roller.

[0015] Preferably, in S5, the plate is placed in a constant temperature and humidity environment for curing, with a temperature of 60±5° C. and a humidity of ≥90%, and the curing time is not less than 7 days.

[0016] Preferably, in S5, finished product inspection is performed after curing is completed, including size inspection, physical property inspection and surface quality inspection.

[0017] Preferably, the following parameters are defined: bamboo fiber content W f , bamboo fiber length L f , water-cement ratio W / C, cement board strength a, strength coefficient β, board strength = a×(1+W f ×L f )×(1-β×W / C).

[0018] Preferably, the following parameters are defined: Flame retardant addition amount W r , thermal retardation excess oxygen index LOI, flame retardant coefficient α, LOI = α × (1 + W f +W r ); define the following parameters: density ρ, thermal conductivity of cement λ, thermal conductivity = λ×(1-0.01×W f ×ρ).

[0019] Compared with the prior art, the present invention has the following beneficial technical effects: by comprehensively designing the ratio parameters, the three properties of flame retardancy, strength and heat insulation can be very well balanced to obtain a bamboo waste fiber reinforced board with good performance, without the need for judgment based on experience, and the consistency of the product can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure is a schematic structural diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0021] Embodiment 1, as Figure 1 As shown, the present invention proposes a production process for rolling forming a bamboo waste fiber reinforced plate, comprising the following steps:

[0022] S1. Processing bamboo waste fiber raw materials and cement raw materials;

[0023] S2. Ingredient design: bamboo waste fiber content 10%, bamboo waste fiber length 1-2cm, water-cement ratio 0.4, flame retardant addition 2%; flame retardant is ammonium phosphate, magnesium carbonate or bentonite, flame retardant performance is measured by thermal retardation excess oxygen index LOI, the higher the LOI, the better the flame retardant performance;

[0024] S3, weighing the ingredients and dry-mixing the cement, flame retardant and bamboo fiber residue evenly;

[0025] S4, add water, stir evenly and then roll-form, the stirring time is not less than 5 minutes, until the mixture is uniform;

[0026] S5. Cool naturally to room temperature and then carry out curing.

[0027] Embodiment 2, a production process for roll-forming a bamboo waste fiber reinforced plate proposed in the present invention, compared with embodiment 1, this embodiment introduces the raw material processing method in S1 in detail.

[0028] The bamboo fiber is cut and crushed by high-speed airflow; the cement used is sulphoaluminate cement, ensuring that the cement fineness meets the requirements, the content passing through the 320-mesh screen is ≤5%, the cement is dry and has no lumps, and is stored in a moisture-proof warehouse.

[0029] Embodiment 3, the present invention proposes a production process for roll-forming a bamboo waste fiber reinforced plate. Compared with embodiment 1, this embodiment introduces the roll-forming process and the curing method in detail.

[0030] Roller forming is carried out in sequence through pre-pressing with a pre-pressing roller, forming with a forming roller and pressurizing with a pressure roller. Specifically, pre-pressing refers to the preliminary compaction of the mixed material by the pre-pressing roller, forming refers to the formation of the thickness and width of the final plate by the forming roller, and pressurizing refers to the further compaction of the plate by the pressure roller to expel internal bubbles.

[0031] Place the board in a constant temperature and humidity environment for curing, the temperature is 60±5℃, the humidity is ≥90%, and the curing time is not less than 7 days. During the curing period, the strength of the board can be appropriately increased by pressurization or coating. After the curing, the finished product is inspected, including size inspection, physical property inspection and surface quality inspection; size inspection is used to detect the length, width and thickness of the board, physical property inspection is used to detect the density, strength and thermal insulation performance of the board, and surface quality inspection is used to detect whether there are cracks, bubbles or other defects on the surface of the board.

[0032] Embodiment 4, a production process for roll-forming a bamboo waste fiber reinforced plate proposed in the present invention, compared with Embodiment 1, Embodiment 2 or Embodiment 3, this embodiment introduces the formula design and product parameter calculation process in detail.

[0033] Define the following parameters: Bamboo fiber content W f , bamboo fiber length L f , water-cement ratio W / C, cement board strength a, strength coefficient β, board strength = a×(1+W f ×L f )×(1-β×W / C), in this embodiment, a=10MPa, β=0.5, W f =0.1,L f =0.02m, W / C=0.4, maximum strength of plate=10×(1+0.1×0.02)×(1-0.5×0.4)=8.016, minimum strength of plate=10×(1+0.1×0.01)×(1-0.5×0.4)=8.008.

[0034] Define the following parameters: Flame retardant addition amount W r , thermal retardation excess oxygen index LOI, flame retardant coefficient α, LOI = α × (1 + W f +W r ), in this embodiment, α=25, W f =0.1,W r =0.02, LOI=25×(1+0.1+0.02)=28.

[0035] The following parameters are defined: density ρ, thermal conductivity of cement λ, thermal conductivity = λ×(1-0.01×W f ×ρ), in this embodiment, ρ=600kg / m 3 , λ=0.5W / m·K, thermal conductivity of plate=0.5×(1-0.01×0.1×600)=0.2.

[0036] According to the comprehensive design of parameters, the minimum strength of the board is 8.008MPa, the heat retardation excess oxygen index LOI is 28, and the thermal conductivity is 0.2. The strength of cement board is about 10MPa, and the strength of this fiber cement board is slightly lower than that of cement board, which ensures the overall strength; according to the classification of building materials, when LOI≥30, the surface material has very good flame retardant properties and almost does not burn, belonging to Class A materials; when 28≤LOI<30, the surface material has good flame retardant properties and burns slowly, belonging to Class B materials; when LOI<28, the flame retardant properties are general and the burning speed is fast. The LOI of this fiber cement board is 28, belonging to Class B materials, and has good flame retardant properties; the thermal conductivity of conventional cement board is about 0.5, and the thermal conductivity of this fiber cement board is 0.2, which is significantly lower than that of cement board, indicating that it has good thermal insulation performance. Through the comprehensive design of parameters and combined with subsequent performance testing, the three properties of flame retardancy, strength and thermal insulation can be very well balanced to obtain bamboo waste fiber reinforced board with good performance.

[0037] In summary, when the present invention is used, by comprehensively designing the ratio parameters, it can very well balance the three properties of flame retardancy, strength and heat insulation, and obtain a bamboo waste fiber reinforced board with good performance, without the need for judgment based on experience, and can ensure the consistency of the product.

[0038] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A production process for roll-forming bamboo waste fiber reinforced plate, characterized in that: The following steps are involved: S1. Processing bamboo waste fiber raw materials and cement raw materials; S2, ingredient design, bamboo fiber content 10%, bamboo fiber length 1-2cm, water-cement ratio 0.4, flame retardant addition 2%; S3, weighing the ingredients and dry-mixing the cement, flame retardant and bamboo fiber residue evenly; S4, adding water, stirring evenly and then rolling to form; S5. Cool naturally to room temperature and then carry out curing.

2. The production process of roll forming of bamboo waste fiber reinforced plate according to claim 1, characterized in that: In S1, bamboo fiber is cut and crushed by high-speed airflow; and sulphoaluminate cement is used as cement.

3. The production process of roll forming of bamboo waste fiber reinforced plate according to claim 1, characterized in that: In S2, the flame retardant is ammonium phosphate, magnesium carbonate or bentonite.

4. The production process of roll forming of bamboo waste fiber reinforced plate according to claim 1, characterized in that: In S4, the roll forming is performed sequentially through pre-pressing with a pre-pressing roller, forming with a forming roller, and pressing with a pressing roller.

5. The production process of roll forming of bamboo waste fiber reinforced plate according to claim 1, characterized in that: In S5, the board is placed in a constant temperature and humidity environment for curing, the temperature is 60±5°C, the humidity is ≥90%, and the curing time is not less than 7 days.

6. The production process of roll forming of bamboo waste fiber reinforced plate according to claim 1, characterized in that: In S5, finished product inspection is carried out after curing, including size inspection, physical property inspection and surface quality inspection.

7. The production process of roll forming of bamboo waste fiber reinforced plate according to claim 6, characterized in that: Define the following parameters: Bamboo fiber content W f , bamboo fiber length L f , water-cement ratio W / C, cement board strength a, strength coefficient β, board strength = a×(1+W f ×L f )×(1-β×W / C).

8. The production process of roll forming of bamboo waste fiber reinforced plate according to claim 7, characterized in that: Define the following parameters: Flame retardant addition amount W r , thermal retardation excess oxygen index LOI, flame retardant coefficient α, LOI = α × (1 + W f +W r ); define the following parameters: density ρ, thermal conductivity of cement λ, thermal conductivity = λ×(1-0.01×W f ×ρ).

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