CN113616028B

CN113616028B - Bamboo spring sofa

Info

Publication number: CN113616028B
Application number: CN202111038626.8A
Authority: CN
Inventors: 王福利; 陈玉霞; 郭勇; 许费扬; 丁仕成; 闫彬; 李创业; 翁蓓蓓; 徐润民; 张锦龙; 邬珊珊; 洪璐
Original assignee: Anhui Agricultural University AHAU
Current assignee: Anhui Agricultural University AHAU
Priority date: 2021-09-06
Filing date: 2021-09-06
Publication date: 2022-07-08
Anticipated expiration: 2041-09-06
Also published as: CN113616028A

Abstract

The invention provides a bamboo spring sofa, which comprises a base and a backrest and is characterized in that a sofa seat surface of the base is provided with a bamboo spring supporting structure, and the supporting structure comprises an elastic supporting layer arranged on a base frame and an elastic comfort layer arranged on the elastic supporting layer; the core layer of the elastic supporting layer consists of an inner container cover and a plurality of bamboo spring units coated on the inner container cover, and each bamboo spring unit is of an independent bag structure and respectively comprises a bamboo spring body and a non-woven bag coated on the bamboo spring body; the bamboo spring body is prepared by improving the physical and mechanical properties of the bamboo spring body through quantitative dipping treatment and then through a winding and shaping process. The bamboo spring sofa has the advantages of air permeability, moisture dispersion, bacteriostasis, antibiosis, green, low carbon and environmental protection, and can meet the quantitative support requirements of people with different body types and weights.

Description

Bamboo spring sofa

Technical Field

The invention relates to the technical field of sofas, in particular to a healthy and environment-friendly bamboo spring sofa seat surface supporting structure, a backrest supporting structure and a sofa which are developed by using bamboo materials as raw materials, regulating and controlling the organization structure of the bamboo materials quantitatively through chemical modification, improving the physical and mechanical properties of the bamboo materials through quantitative dipping treatment, preparing a bamboo spring filling material through processes such as winding and shaping and the like, and meeting the requirements of quantitative support and comfort of people with different body types and weights.

Background

In the use process of the sofa, the sofa seat surface supporting structure is a main stress part, and the comfort and the service life of the sofa are determined by the sofa seat surface supporting structure.

At present, the stress mode of the sofa seat surface supporting structure mainly comprises bandage interweaving bearing, lath bearing, serpentine spring bearing and the like. The bandage in the bandage interweaving structure is made of rubber or latex wires, so that the elasticity difference is large, the bandage is easy to relax and age, and the service life of the sofa is influenced; the batten structure is borne by the plate, the elastic performance of the batten structure is poor, and the influence on the use comfort is large; the metal spring in the serpentine spring structure is superior to the two structures in elasticity and durability, but the raw material of the metal spring is steel or alloy steel and the like, is a non-renewable resource, belongs to a material with high energy consumption and high emission, and has high recovery cost. In addition, the filler of the sofa seat surface supporting structure is usually sponge, and the sponge with different density or elasticity, such as shaped sponge, low density sponge, medium soft sponge, high resilience sponge, etc., is generally used according to the different distance from the seat surface structure. The thickness of the filling layer of the sofa seat surface supporting structure can reach 20-30 cm, the using amount of the sponge is very large, the sponge raw material is a petrochemical product and belongs to a non-renewable resource, the air permeability and the moisture dissipating performance of the sponge filler are poor, and the sponge filler is very easy to mildew or breed bacteria and other microorganisms for a long time and is not beneficial to human health.

Accordingly, some plant fiber material filled sofa cushions are available on the market. The so-called plant fiber material filled sofa cushion usually has a serious waste of resources by destroying the tissue structure of the plant material, extracting the plant fiber, bonding the plant fiber by an adhesive, and then hot-pressing the extracted plant fiber, and the materials have a series of problems, for example, the existing bamboo filament pressing and forming method for manufacturing the bamboo filament unit is used for designing and manufacturing the filling material, the treatment method destroys the natural structure of bamboo, and the dispersed bamboo filaments need to be bonded by the adhesive or the low-melting point polyester fiber to manufacture the board, and the manufactured board has large hardness and small elasticity, so that the sitting comfort, poor air permeability and the like are caused, and even toxic substances such as formaldehyde and the like are contained. Therefore, the development of a green, low-carbon and environment-friendly sofa material with good performance is a trend of sofa development in the future by searching for a substitute of non-renewable resources.

The bamboo wood has the advantages of short growth period, strong regeneration capacity, high propagation speed, degradability, good biocompatibility, low energy consumption, no pollution, high strength, good toughness and simple structure, and is widely applied to industries such as buildings, houses, textiles and the like. In addition, the natural bamboo wood has excellent flexibility, specific stiffness and specific strength even can be comparable to steel, especially, the bamboo fiber has a fine hierarchical structure and excellent physical and mechanical properties, the natural bamboo wood has excellent functions of bacteriostasis, antibiosis, moisture absorption, moisture dissipation and odor removal, the tensile strength (300-900 MPa) is even superior to that of common steel, and bamboo fiber cells and thin-wall cell walls are of a multilayer structure, and due to the hierarchical structure and the pore structure, the bamboo wood has physical adjustability, chemical adjustability and mechanical adjustability. Therefore, if the integral organization structure of the bamboo is kept, the adjustable range of the physical and mechanical properties of the bamboo can be widened through a chemical modification technology and a winding, curing and forming process, so that a healthy and environment-friendly bamboo spring material is obtained, and a corresponding bamboo spring sofa supporting structure and a sofa are further obtained.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a bamboo spring sofa supporting structure and a sofa, wherein the bamboo spring is breathable, moisture-dissipating, antibacterial, green, low-carbon and environment-friendly, and the bamboo spring sofa supporting structure and the sofa can meet the quantitative supporting requirements of people with different body types and weights, so that the internal support can be adjusted and replaced.

The invention adopts the following technical scheme to solve the technical problems:

a bamboo spring sofa comprises a base and a backrest and is structurally characterized in that a sofa seat surface of the base is provided with a bamboo spring support structure, and the support structure comprises an elastic support layer arranged on a base frame and an elastic comfort layer arranged on the elastic support layer;

the elastic supporting layer is formed by arranging a plurality of bamboo spring units in a vertical matrix.

Furthermore, the application surface of the backrest is also provided with a bamboo spring supporting structure.

Further, the bamboo spring unit comprises a bamboo spring body and a cloth bag wrapping the bamboo spring body, and the preparation method of the bamboo spring body comprises the following steps:

(1) drawing the bamboo material to obtain bamboo filaments, and dividing the bamboo filaments into one grade per 5GPa and six grades according to the elastic modulus of 0-30 GPa;

(2) the bamboo filament primary raw materials with the elastic modulus grades of 4, 5 and 6 are subjected to the following treatment;

a, chemical modification: oxidizing agent and carboxylic acid or hypochlorite are adopted according to the proportion of 1: 1, jointly treating the primary raw materials of the bamboo filaments in proportion at the temperature of 20-60 ℃ for 2-4 h; secondly, treating the bamboo filaments by using a strong alkali solution with the concentration of 5-20%, wherein the temperature is 40-80 ℃, and the treatment time is 2-4 hours; thirdly, the bamboo filaments processed by the steps are sent into an automatic leaching box, and leaching liquid is automatically leached to be neutral; fourthly, drying the bamboo filaments treated in the third step at the temperature of 40-60 ℃ to adjust the water content to 20-30%;

b, dipping modification: firstly, immersing bamboo filaments into a nano inorganic oxide solution with the particle size of 10-50 nm, wherein the solid content is 15-50%, the temperature is 20-60 ℃, a vacuum negative pressure environment is realized through a vacuum tank, the dipping time is 2-4 hours, the curing temperature is 100-140 ℃, and the curing time is 1-3 hours; secondly, soaking the bamboo filaments into the modified epoxy resin, regulating and controlling a negative pressure environment through a vacuum tank, pressurizing and depressurizing once every 10min at a pressure of 0.5-5 MPa and a pressurizing and depressurizing speed of 0.02-1 MPa/min, and soaking for 1-4 h; then, carrying out surface curing at the curing temperature of 120-140 ℃ for 10-30 min;

(3) performing filament splitting and coil coiling treatment on the bamboo filaments treated in the step (2), wherein the temperature of a coil coiling is 130-160 ℃, and performing primary curing treatment while coiling the coil; after primary curing treatment, carrying out secondary curing treatment, wherein the secondary curing temperature is 100-140 ℃, the curing time is 1-3 h, the setting time is 12-24 h, and then drying treatment is carried out, so that the water content is adjusted to 7-10%;

(4) polishing the bamboo spring processed in the step (3); and then, dividing the bamboo spring with the same specification into a plurality of density grades according to the mass difference from small to large, and finally obtaining the bamboo spring bodies with different specifications and different mass grades.

In a preferred embodiment of the present invention, in the step (1), the content of the bamboo fiber in the bamboo filament is detected by infrared, and the model E ═ 40.129V is determined according to the relationship between the elastic modulus of the bamboo filament and the volume fraction of the bamboo fiber_f+0.2219, dividing the bamboo filament into six grades according to the elastic modulus of 0-30 GPa and one grade per 5 GPa; wherein the relation model E is 40.129V_f+0.2219, E represents the elastic modulus of the bamboo filament, unit: GPa; v_fThe volume fraction of the bamboo fiber of the bamboo filament is expressed.

As one preferable mode of the present invention, in the step (4), the bamboo spring bodies with different specifications are different in wire diameter, caliber and free height, wherein the bamboo spring bodies with the same wire diameter, caliber and free height are divided into four quality grades according to the quality difference, and accordingly, the bamboo spring bodies with different specifications and different density grades are obtained.

In a preferred embodiment of the present invention, the wire diameter sections of the bamboo spring body are 4 to 5mm, 5 to 6mm, and 6 to 7mm, respectively; the diameter intervals of the bamboo springs are respectively 4-5 cm, 5-6 cm and 6-7 mm; the free height of the bamboo spring is 6-24 cm; the density interval of the bamboo spring is 1.2-2.0 g/cm³。

As one of the preferable modes of the invention, the base frame is a frame made of solid wood, composite board, metal or polymer composite material, and is composed of a plurality of longitudinal laths and a plurality of transverse laths arranged between the adjacent longitudinal laths; the upper surface of the base frame is covered with a layer of balance net.

As one of the preferable modes of the invention, the core layer of the elastic comfort layer is a comfort core layer, the periphery of the comfort core layer is coated with the liner skin, and the periphery of the liner skin is coated with the first fabric composite layer; the core layer of the elastic supporting layer is a supporting and adjusting core layer, the upper surface of the supporting and adjusting core layer is covered with a second fabric composite layer, and the peripheral side surfaces of the supporting and adjusting core layer are covered with surrounding edges; the elastic comfortable layer is connected with the elastic supporting layer through a zipper or a magic tape.

In a preferred aspect of the present invention, the comfortable core layer is made of a processed sheet of wool, horsehair, or camel hair; the down feather or loofah sponge silk wadding is a sheet-shaped inner container, the inner container skin is non-woven fabric or cloth, the down feather or loofah sponge silk wadding is uniformly distributed through quilting, and the loofah sponge silk wadding is formed by smashing loofah into filaments.

In a preferable mode of the invention, in the support adjusting core layer, the top of the surrounding edge extends horizontally inwards to form a first extending part towards the lower surface of the second fabric composite layer, and a first connecting part is arranged along three edges of the first extending part; the bottom of the second fabric composite layer horizontally extends inwards to the upper surface of the supporting and adjusting core layer to form a second extending part, and a second connecting part matched with the first connecting part is arranged along the inner edge of three sides of the second extending part; the first connecting piece and the second connecting piece are used for opening and closing the elastic supporting layer, and the first extending part and the second extending part are fixedly connected through sewing on the side without the connecting pieces.

In a preferred embodiment of the present invention, the first and second connecting members are zippers, hook and loop fasteners, or snap fasteners.

As one of the preferable modes of the invention, the first fabric composite layer and the second fabric composite layer are formed by quilting fabrics, upright cotton, sponge or latex and non-woven fabrics from outside to inside in sequence; wherein the thickness proportion of the upright cotton does not exceed 1/3 of the fabric composite layer and the surrounding edge.

In a preferred embodiment of the present invention, an opening/closing port for attaching and detaching the bamboo spring unit is provided on one side or continuous sides of the inner container cover covering the bamboo spring unit.

In a preferred embodiment of the present invention, the inner container cover has a plurality of bamboo spring units directly arranged in a vertical matrix arrangement, and adjacent bamboo spring units are divided by dividing lines; or, in the inner container cover, the bamboo spring unit is arranged in the inner container cover in the form of a plurality of spring module packs; the spring module bag comprises a non-woven fabric bag and a plurality of bamboo spring units which are arranged in the non-woven fabric bag in a vertical matrix arrangement mode; the spring module is wrapped, and adjacent bamboo spring units are divided by dividing lines.

In a preferred embodiment of the present invention, the inner bag cover is made of a non-woven fabric, and the spring module packs in the inner bag cover are connected by the non-woven fabric inner bag cover to form a spring bed net. Meanwhile, the spring module bag is rectangular, square or triangular; the dividing lines on the spring module bag are quilting dividing lines, zipper tape dividing lines or hot-pressing bonding dividing lines.

In a preferred embodiment of the present invention, the bamboo spring body of the bamboo spring unit is one of a "cylindrical spiral type independent bamboo spring", a "waist drum type independent bamboo spring", and a "bamboo spring-in-bamboo spring", or a combination of two or more of the foregoing springs. Correspondingly, the spring module pack can also be formed by arranging and combining the independent bagged bamboo spring units in the form.

As one preferable mode of the present invention, the bamboo spring body in the bamboo spring unit may also be one of a "cylindrical spiral type independent bamboo spring" with a spring guide rod or a "bamboo spring in the spring", or a combination of two or more of the foregoing springs, that is, a spring guide rod is further fitted in the spring opening of the bamboo spring body; the preparation method of the spring guide rod comprises the following steps:

(2) carrying out hydro-thermal treatment on the bamboo filament primary raw material with the elastic modulus grade of 1 at the treatment temperature of 80-100 ℃ for 0.5-2 h;

(3) immersing the bamboo filaments treated in the step (2) into a silane coupling agent solution for 1-3 h, and then drying by microwave until the water content is 7-10%;

(4) carrying out epoxy resin impregnation treatment on the bamboo filaments treated in the step (3), and carrying out vacuum negative pressure environment in a vacuum tank, wherein the impregnation time is 1-4 h, the curing temperature is 120-140 ℃, and the curing time is 1-2 h, so as to obtain the bamboo filaments with good stability and durability; the epoxy resin has the molecular weight of 200-800, the solid content of 20-60% and the viscosity of 10-50 mps;

(5) and (4) cutting the bamboo filaments processed in the step (4) into bamboo filament sections with different lengths, polishing, and dividing the bamboo filament sections into spring guide rods with different heights and external diameter specifications according to the caliber of the spring.

Furthermore, the sofa also comprises a sofa outer cover; the sofa outer sleeve integrally wraps the sofa backrest and the outer surface of the bamboo spring sofa seat surface supporting structure.

In a preferred embodiment of the present invention, the material of the sofa cover may be cotton, hemp, or other cloth, or may be real leather, imitation leather, or the like.

Compared with the prior art, the invention has the advantages that: the invention develops a bamboo spring sofa core material with zero formaldehyde, environmental protection, ventilation and antibiosis by using bamboo wood, and prepares the high-performance sofa seat surface supporting structure and the sofa, thereby not only being low-carbon, healthy and environment-friendly, but also meeting the quantitative support of people with different body types and weights, improving the pressure distribution of the human bed interface, promoting the blood circulation, eliminating the fatigue and improving the sleeping comfort of the human body from the physiology and psychology. The method comprises the following specific steps:

(1) the bamboo spring with moisture absorption and dispersion and rigidity capable of being quantitatively regulated and controlled is prepared by fully utilizing the flexibility of the bamboo and quantitatively regulating and controlling the physical and mechanical properties of the bamboo through processes of chemical treatment, dipping filling and the like, and the bamboo spring is free of formaldehyde, non-toxic, green, low-carbon, healthy, environment-friendly and good in biocompatibility.

(2) The invention fully utilizes the porosity of the bamboo wood and the pore structure characteristics of the cell wall, regulates and controls the pore structure through quantitative chemical treatment, realizes the accurate regulation and control of the moisture absorption and dispersion of the bamboo wood, and overcomes the limitation of poor air permeability of the sponge and the latex cushion.

(3) The elasticity and the strength of the bamboo spring wire are regulated and controlled by utilizing the characteristics of porosity and cell wall pore structure of the bamboo wood fully and by using a quantified impregnated nano material and node type resin regulation and filling technology, so that the original 15-30 GPa is increased to 20-50 GPa, the hardness of the bamboo spring sofa is accurately regulated and controlled, and the fitting degree of the seat surface support structure of the bamboo spring sofa and a human body is improved by more than 30%.

(4) The method fully exerts the characteristics of renewable bamboo wood, short growth period, low density, good flexibility, high strength, and high specific stiffness and specific strength, and the prepared bamboo spring mattress has the advantages of good light weight and low carbon, and the density of the bamboo spring is 1.2-2.0 g/cm³Compared with alloy steel, carbon steel and the like, 7.7-7.9 g/cm³The weight of the metal spring sofa is reduced by about 80 percent, the limitations of large weight, high energy consumption and non-renewable raw materials of the metal spring sofa are overcome, and the material lightweight design of replacing steel with bamboo is realized.

(5) The method fully utilizes the characteristics of pores and hierarchical structures of bamboo cell tissues, prepares the bamboo spring wire with high elastic modulus and wide adjustable range through quantitative function regulation, and regulates the elastic modulus to be 20-50 GPa from 10-30 GPa of the original raw material bamboo wire, thereby realizing the quantitative regulation and control of the rigidity and the supporting performance of the bamboo spring to adapt to different requirements of crowds with different body types and weights. The cell tissues of the bamboo are mainly thick-wall bamboo fiber cells and thin-wall cells, the bamboo has a multi-scale pore structure, particularly the bamboo fibers have a fine hierarchical structure and excellent mechanical properties, the elastic modulus of the bamboo fibers is 20-40 GPa, and the elastic properties of the bamboo fibers can be improved by 30-50% through chemical impregnation modification.

(6) The bamboo spring guide rod device fully utilizes the structural characteristics of radial gradient distribution of bamboo fiber bundles, can prepare bamboo springs (2-6 grades) and spring guide rods (1 grade) with different rigidities by bamboo filament rigidity grading (1-6 grades, 5-30 GPa), and realizes full high-value utilization of bamboo. The bamboo material is a functional gradient composite material, the vascular bundles of the bamboo material close to the green side of the bamboo are densely distributed, the volume fraction of the vascular bundles is as high as 60-80%, the parenchyma content is very little, the strength (300-400 MPa) and the modulus (20-30 GPa) of the bamboo material are high, the vascular bundles of the bamboo material close to the yellow side of the bamboo are sparsely distributed, the parenchyma content is large, the strength and the modulus of the bamboo material are small, the strength and the modulus of the bamboo material in the middle area of the bamboo wall are similar to the average strength and the modulus of the bamboo wall, and the bamboo material can be fully utilized due to different materials to manufacture bamboo springs and bamboo spring guide rods with different functions and performances.

(7) The invention fully utilizes the rigidity difference of the bamboo springs to grade the rigidity of the bamboo springs, establishes the grading standard of the bamboo springs, overcomes the limitation of the performance difference, and can select the bamboo springs with different rigidity grades according to the supporting requirements of the seat surface supporting structure and the backrest supporting structure.

Drawings

FIG. 1 is a schematic view showing the overall structure of a bamboo spring sofa according to example 7;

FIG. 2 is a partial sectional view of the bamboo spring sofa according to the embodiment 7;

FIG. 3 is a schematic view of the layered structure of the elastic comfort layer in example 7;

FIG. 4 is a sectional view showing the structure of the elastic support layer and the base frame in the state of being engaged in example 7;

FIG. 5 is a schematic structural view of the elastic support layer in example 7;

FIG. 6 is a view showing the structure in which the bamboo spring units are directly arranged in the inner bag cover in the form of independent pockets in embodiment 7;

FIG. 7 is a structural view of a bamboo spring unit arranged in a liner cover in a spring module pack form in embodiment 7;

fig. 8 is a schematic view of a bamboo spring unit of different structural forms in embodiment 7.

In the figure: 1 is the back, 2 is the base, 21 is the base frame, 22 is the elastic support layer, 221 is the support and adjusts the sandwich layer, 2211 is the inner bag cover, 222 is the second surface material composite layer, 2221 is the connecting piece two, 223 is the surrounding edge, 2231 is the connecting piece one, 23 is the elasticity comfort layer, 231 is the comfort sandwich layer, 232 is the inner bag skin, 233 is the first surface material composite layer, 24 is the balance net, 25 is the bamboo spring unit, 251 is the bamboo spring body, 252 is the non-woven bag, 253 is the spring guide, 26 is the spring module package, 261 is the non-woven bag, 3 is the sofa overcoat.

Detailed Description

The following examples are given for the detailed implementation and the specific operation procedures, but the scope of the present invention is not limited to the following examples.

Example 1

The preparation method of the bamboo spring comprises the following steps:

first, sorting raw materials

(1) Bamboo filaments are obtained from bamboo through a drawing process, the cross section of each bamboo filament can be round, square, rectangular and the like, the length of each bamboo filament is 0.5-2.5 m, and the diameter or side length is 4-7 mm.

(2) Detecting the bamboo fiber content of the bamboo filament by infrared, and determining the relation model E of the bamboo elastic modulus and the bamboo fiber volume fraction as 40.129V_f+0.2219, dividing the bamboo filament into six grades according to the elastic modulus (0-30 GPa) at every 5 GPa; wherein the relation model E is 40.129V_f+0.2219, E represents the elastic modulus of the bamboo filament, unit: GPa; v_fThe volume fraction of the bamboo fiber of the bamboo filament is expressed.

(3) Selecting bamboo filament primary raw materials with the elastic modulus grades of 4, 5 and 6 (15-30 GPa) for subsequent modification treatment.

Second, modification treatment

(1) Chemical modification: the method adopts sulfite and carboxylic acid, and the ratio of 1: 1, jointly treating the primary raw material of the bamboo filaments at the temperature of 20 ℃ for 4 hours. ② the bamboo filaments are treated by sodium hydroxide solution with the concentration of 5 percent at the temperature of 40 ℃ for 4 hours. And thirdly, feeding the bamboo filaments treated by the steps into an automatic leaching box, and automatically leaching until leaching liquor is neutral. The automatic leaching box comprises a material inlet, a leaching chamber and a material outlet; the leaching chamber comprises leaching heads positioned at the upper, lower, left and right directions, a waste liquid PH value monitoring digital display window and a waste liquid recovery tank; the shower head can spray linear water columns, and the water pressure is 0.2. Fourthly, the bamboo filaments processed in the third step are sent into a microwave drying chamber for drying treatment, the temperature is controlled at 40 ℃, and the water content is adjusted to 20%.

In the step, the bamboo filament lignin and the hemicellulose are removed quantitatively to realize the quantitative regulation and control of the flexibility and the pore structure of the bamboo filament lignin and the hemicellulose, and the bamboo filament lignin and the hemicellulose are laid for the dipping modification and the quantitative regulation and control of the mechanical property of the bamboo filament lignin and the hemicellulose.

(2) Dipping modification: firstly, soaking bamboo filaments into nano silicon dioxide solution with the particle size of 10nm, wherein the solid content is 15%, the temperature is 20 ℃, the vacuum negative pressure environment is realized through a vacuum tank, the soaking time is 2 hours, the curing temperature is 100 ℃, and the curing time is 3 hours. Secondly, the bamboo filaments are immersed in the modified epoxy resin, the negative pressure environment is regulated and controlled through a vacuum tank, the pressure is increased and reduced once every 10min, the pressure is 0.5MPa, the pressure and pressure reduction speed is 0.02MPa/min, the immersion time is 4h, the curing temperature is 120 ℃, and the curing time is 3 h.

In the step, the physical and mechanical properties, particularly the elastic properties of the bamboo filaments in multiple scales are quantitatively regulated and controlled by inflating the cell walls of the bamboo filaments through the nano inorganic oxides and filling the large ducts of the bamboo filaments with the epoxy resin.

Processing of bamboo spring

(1) And (4) carrying out filament splitting treatment on the modified bamboo filaments by adopting a filament splitter. Divide the silk ware including dividing silk carousel, pivot, divide the silk carousel including dividing the silk mouth, divide the silk mouth to arrange with the dot matrix form, the interval 10 ~ 20 cm.

(2) Slowly feeding the divided bamboo filaments into a spring coiling chamber at a constant speed for spring coiling treatment, and synchronously performing primary curing treatment at the temperature of 130 ℃ in the spring coiling chamber to obtain a primarily formed bamboo spring;

the coil spring chamber comprises a material inlet, a plurality of coil spring rod cores, a heater, a temperature display window, a cutter and a material outlet. The first coil spring rod core: the rod core has a smooth surface and a diameter of 4-7 cm. The second coil spring rod core: the surface of the rod core is provided with a thread groove, the thread lead angle of the thread groove is 3-10 degrees, the width is 4-8 mm, the depth is 4-8 mm, and the diameter of the rod core (excluding the groove depth) is 4-7 cm.

(3) And (3) conveying the bamboo spring into a curing chamber for secondary curing, wherein the curing temperature is 100 ℃, the curing time is 3 hours, the setting is 24 hours, and then the bamboo spring is dried to adjust the water content to 7%.

(4) And (4) conveying the bamboo spring processed in the step (3) into a polishing chamber to polish the surface of the bamboo spring, flattening and rounding the two end parts of the bamboo spring, and detecting the surface quality of the bamboo spring through an infrared sensor.

(5) Sorting the bamboo springs by a mass sensor, dividing the bamboo springs with the same specification into four mass grades according to the mass difference from small to large, and spraying corresponding grade codes; meanwhile, 20 bamboo springs are randomly selected from each grade, the rigidity, the fatigue resistance and the creep resistance of the springs are tested, and the relationship between the mechanical property and the quality of the springs is established to guide the rapid grading of the bamboo springs. Wherein, the bamboo spring bodies with different specifications mean that the wire diameter, the caliber and the free height of the bamboo spring body are different. In the embodiment, the bamboo springs with the consistent wire diameter, caliber and free height are divided into four quality grades according to the quality difference from small to large, so that the bamboo spring bodies with different specifications and different density grades are obtained.

Specifically, in the embodiment, the wire diameter intervals of the finally obtained bamboo spring body are respectively 4-5 mm, 5-6 mm and 6-7 mm; the diameter intervals of the bamboo springs are respectively 4-5 cm, 5-6 cm and 6-7 mm; the free height of the bamboo spring is 6-24 cm; the density interval of the bamboo spring is 1.2-2.0 g/cm³。

Example 2

The preparation method of the bamboo spring comprises the following steps:

first, sorting raw materials

(2) Detecting the content of bamboo fiber in the bamboo filament by infrared, and determining the relation model E of the bamboo fiber volume fraction (40.129V) according to the bamboo elastic modulus_f+0.2219, dividing the bamboo filament into six grades according to the elastic modulus (0-30 GPa) at every 5 GPa; wherein the relational model E is 40.129V_f+0.2219, E represents the elastic modulus of the bamboo filament, unit: GPa; v_fThe volume fraction of the bamboo fiber of the bamboo filament is expressed.

Second, modification treatment

(1) Chemical modification: hydrogen peroxide and carboxylic acid are used according to the weight ratio of 1: 1, jointly treating the primary raw material of the bamboo filaments at the temperature of 60 ℃ for 2 hours. ② the bamboo filaments are treated by sodium hydroxide solution with the concentration of 20 percent at the temperature of 80 ℃ for 2 hours. And thirdly, feeding the bamboo filaments treated by the steps into an automatic leaching box, and automatically leaching until leaching liquor is neutral. The automatic spray washing box comprises a material inlet, a spray washing chamber and a material outlet; the leaching chamber comprises leaching heads positioned at the upper, lower, left and right directions, a waste liquid pH value monitoring digital display window and a waste liquid recovery tank; the shower head can spray linear water columns, and the water pressure is 0.4 MPa. Fourthly, the bamboo filaments processed in the third step are sent into a microwave drying chamber for drying treatment, the temperature is controlled at 60 ℃, and the water content is adjusted to 30%.

In the step, the flexibility and the pore structure of the bamboo filament lignin and the hemicellulose are quantitatively regulated and controlled by quantitatively removing the bamboo filament lignin and the hemicellulose, and the bamboo filament lignin and the hemicellulose are laid for the impregnation modification and the quantitative regulation and control of the mechanical property of the bamboo filament lignin and the hemicellulose.

(2) Dipping modification: firstly, bamboo filaments are immersed into a nano calcium dioxide solution with the particle size of 50nm, the solid content is 50%, the temperature is 60 ℃, a vacuum negative pressure environment is realized through a vacuum tank, the immersion time is 4 hours, the curing temperature is 140 ℃, and the curing time is 1 hour. Secondly, the bamboo filaments are immersed in the modified epoxy resin, the negative pressure environment is regulated and controlled through a vacuum tank, the pressure is increased and reduced once every 10min, the pressure is 5MPa, the pressure and pressure reduction speed is 1MPa/min, the immersion time is 1h, the curing temperature is 140 ℃, and the curing time is 1 h.

In the step, the physical and mechanical properties, especially the elastic properties of the bamboo filaments in multiple scales are quantitatively regulated and controlled by inflating the bamboo filament cell walls through the nano inorganic oxide and filling the large bamboo filament guide pipes with the epoxy resin.

Processing of bamboo spring

(2) Slowly feeding the divided bamboo filaments into a spring coiling chamber at a constant speed for spring coiling treatment, and synchronously performing primary curing treatment at the temperature of 160 ℃ in the spring coiling chamber to obtain a primarily formed bamboo spring;

(3) And (3) conveying the bamboo spring into a curing chamber for secondary curing, wherein the curing temperature is 140 ℃, the curing time is 1h, the setting is 12h, and then the drying treatment is carried out, so that the water content is adjusted to 10%.

(5) Sorting the bamboo springs by a mass sensor, dividing the bamboo springs with the same specification into four mass grades according to the mass difference from small to large, and spraying corresponding grade codes; meanwhile, 20 bamboo springs are randomly selected from each grade, the rigidity, the fatigue resistance and the creep resistance of the springs are tested, and the relationship between the mechanical property and the quality of the springs is established to guide the rapid grading of the bamboo springs. Wherein, the bamboo spring bodies with different specifications mean that the wire diameter, the caliber and the free height of the bamboo spring body are different. In this embodiment, the bamboo springs with the same wire diameter, caliber and free height are divided into four quality grades according to the quality difference from small to large, so as to obtain bamboo spring bodies with different specifications and different density grades.

Example 3

The preparation method of the bamboo spring comprises the following steps:

first, sorting raw materials

(2) Detecting the content of bamboo fiber in the bamboo filament by infrared, and determining the relation model E of the bamboo fiber volume fraction (40.129V) according to the bamboo elastic modulus_f+0.2219, dividing the bamboo filament into six grades according to the elastic modulus (0-30 GPa) at every 5 GPa; wherein the relation model E is 40.129V_f+0.2219, E represents the elastic modulus of the bamboo filament, unit: GPa; v_fRepresents the volume fraction of bamboo fiber of the bamboo filament.

Second, modification treatment

(1) Chemical modification: firstly, hypochlorous acid and hypochlorite are adopted according to the proportion of 1: 1, jointly treating the primary raw material of the bamboo filaments at the temperature of 40 ℃ for 3 hours. ② treating the bamboo filaments by adopting a sodium hydroxide solution with the concentration of 10 percent at the temperature of 60 ℃ for 3 hours. And thirdly, feeding the bamboo filaments treated by the steps into an automatic leaching box, and automatically leaching until leaching liquor is neutral. The automatic leaching box comprises a material inlet, a leaching chamber and a material outlet; the leaching chamber comprises leaching heads positioned at the upper, lower, left and right directions, a waste liquid PH value monitoring digital display window and a waste liquid recovery tank; the shower head can spray linear water columns, and the water pressure is 0.3 MPa. Fourthly, the bamboo filaments processed in the third step are sent into a microwave drying chamber for drying treatment, the temperature is controlled at 50 ℃, and the water content is adjusted to 25%.

(2) Dipping modification: firstly, bamboo filaments are immersed into nano silicon dioxide solution with the particle size of 30nm, the solid content is 30%, the temperature is 40 ℃, the vacuum negative pressure environment is realized through a vacuum tank, the immersion time is 3 hours, the curing temperature is 120 ℃, and the curing time is 2 hours. Secondly, the bamboo filaments are immersed in the modified epoxy resin, the negative pressure environment is regulated and controlled through a vacuum tank, the pressure is increased and reduced once every 10min, the pressure is 2MPa, the pressure and pressure reduction speed is 0.5MPa/min, the immersion time is 2h, the curing temperature is 130 ℃, and the curing time is 2 h.

Processing of bamboo spring

(2) Slowly feeding the divided bamboo filaments into a spring coiling chamber at a constant speed for spring coiling treatment, and synchronously performing primary curing treatment at the temperature of 140 ℃ in the spring coiling chamber to obtain a primarily formed bamboo spring;

(3) And (3) conveying the bamboo spring into a curing chamber for secondary curing, wherein the curing temperature is 120 ℃, the curing time is 2 hours, the setting is 20 hours, and then the drying treatment is carried out, so that the water content is adjusted to 8%.

The bamboo spring material prepared by the method has the characteristics of zero formaldehyde, environmental protection, ventilation, antibiosis, good mechanical property and the like, and the elasticity and the strength of the bamboo spring wire are regulated and controlled by fully utilizing the porosity of bamboo and the pore structure characteristics of cell walls and through a quantified impregnated nano material and a node type resin regulation and filling technology, so that the original 15-30 GPa is increased to 20-50 GPa, and the accurate regulation and control of the cushion hardness of the bamboo spring sofa (the prepared bamboo spring material serves as a core material of a sofa seat surface) can be realized.

Example 4

The preparation method of the spring guide rod of the embodiment comprises the following steps:

(1) drawing the bamboo to obtain bamboo filaments, and grading the bamboo filaments into six grades every 5GPa according to the elastic modulus of 0-30 GPa.

(2) Carrying out hydro-thermal treatment on the bamboo filament primary raw material with the elastic modulus grade of 1 at the treatment temperature of 80 ℃ for 2h to obtain the bamboo filament with impurities such as pectin, extract and the like removed.

(3) And (3) immersing the bamboo filaments treated in the step (2) into a silane coupling agent solution for 1h, and then drying the bamboo filaments by microwave until the water content is 7% so as to reduce the hydrophilicity of the bamboo and promote the combination of the bamboo and the epoxy resin, wherein the silane coupling agent is a common variety on the market.

(4) Carrying out epoxy resin impregnation treatment on the bamboo filaments treated in the step (3), and carrying out vacuum negative pressure environment in a vacuum tank, wherein the impregnation time is 1h, the curing temperature is 120 ℃, and the curing time is 2h, so as to obtain the bamboo filaments with good stability and durability; the epoxy resin has the molecular weight of 200-800, the solid content of 20% and the viscosity of 10-50 mps.

(5) And (3) cutting the bamboo filaments processed in the step (4) into bamboo filament sections with different lengths, polishing, and dividing the bamboo filament sections into bamboo filament sections with different heights and outer diameter specifications according to the spring calibers of the bamboo springs in the embodiments 1-3 to be used as spring guide rods.

Example 5

(2) Carrying out hydro-thermal treatment on the bamboo filament primary raw material with the elastic modulus grade of 1 at the treatment temperature of 100 ℃ for 0.5h to obtain the bamboo filament with impurities such as pectin, extract and the like removed.

(3) And (3) immersing the bamboo filaments treated in the step (2) into a silane coupling agent solution for 3 hours, and then drying the bamboo filaments by microwave until the water content is 10% so as to reduce the hydrophilicity of the bamboo and promote the combination of the bamboo and the epoxy resin, wherein the silane coupling agent is a common variety on the market.

(4) Carrying out epoxy resin impregnation treatment on the bamboo filaments treated in the step (3), and carrying out vacuum negative pressure environment in a vacuum tank, wherein the impregnation time is 4h, the curing temperature is 140 ℃, and the curing time is 1h, so as to obtain the bamboo filaments with good stability and durability; the epoxy resin has the molecular weight of 200-800, the solid content of 60% and the viscosity of 10-50 mps.

Example 6

(2) Carrying out hydro-thermal treatment on the bamboo filament primary raw material with the elastic modulus grade of 1 at the treatment temperature of 90 ℃ for 1h to obtain the bamboo filament without impurities such as pectin and extract.

(3) And (3) immersing the bamboo filaments treated in the step (2) into a silane coupling agent solution for 2 hours, and then drying the bamboo filaments by microwave until the water content is 8% so as to reduce the hydrophilicity of the bamboo and promote the combination of the bamboo and the epoxy resin, wherein the silane coupling agent is a common variety on the market.

(4) Carrying out epoxy resin impregnation treatment on the bamboo filaments treated in the step (3), and carrying out vacuum negative pressure environment in a vacuum tank, wherein the impregnation time is 2h, the curing temperature is 130 ℃, and the curing time is 1.5h, so as to obtain the bamboo filaments with good stability and durability; the epoxy resin has the molecular weight of 200-800, the solid content of 40% and the viscosity of 10-50 mps.

Example 7

As shown in fig. 1 to 8, the bamboo spring sofa of the present embodiment includes a backrest 1 and a base 2, and as a design innovation, the present embodiment has a bamboo spring support structure mounted on the frame of the backrest 1 and the frame of the base 2, and the sofa is integrally wrapped by a sofa cover 3 to form a whole.

As shown, the bamboo spring support structure includes a resilient support layer 22 disposed on the base frame 21 or the back frame and a resilient comfort layer 23 disposed on the resilient support layer 22.

The core layer of the elastic supporting layer 22 is composed of an inner container cover 2211 and a plurality of bamboo spring units 25 wrapping the inner container cover 2211, and each bamboo spring unit 25 is of an independent bag structure and comprises a bamboo spring body 251 and a non-woven bag 252 wrapping the bamboo spring body 251; the bamboo spring body 251 is obtained by the method of examples 1 to 3. The core layer of the elastic comfortable layer 23 is formed by combining one or more of latex, foam sponge, wool, horsehair, camel hair, down feather and loofah sponge silk wadding; and, wherein, wool, horsehair, camel hair are the processed sheet; the down feather or loofah sponge silk wadding is a sheet-shaped inner container, the inner container skin is non-woven fabric or cloth, and the down feather or loofah sponge silk wadding is uniformly distributed through quilting; the loofah sponge silk wadding is formed by smashing loofah sponge into silk.

Specifically, referring to fig. 2 and 4, in the present embodiment, the base frame 21 is a frame made of solid wood, composite board, metal or polymer composite material, and is composed of a plurality of longitudinal slats and a plurality of transverse slats disposed between adjacent longitudinal slats; the upper surface of the base frame 21 is covered with a layer of balancing mesh 24.

Specifically, referring to fig. 3, in the present embodiment, the core layer of the elastic comfort layer 23 is a comfort core layer 231, the outer periphery of the comfort core layer 231 is covered with a liner skin 232, and the outer periphery of the liner skin 232 is covered with a first fabric composite layer 233. Referring to fig. 4, the core layer of the elastic support layer 22 is a support adjusting core layer 221, an upper surface of the support adjusting core layer 221 is covered with a second fabric composite layer 222, and peripheral sides are covered with surrounding edges 223. Wherein the first fabric composite layer 233 and the second fabric composite layer 222 are formed by quilting fabric, upright cotton, sponge or latex and non-woven fabric from outside to inside in sequence; and the thickness proportion that upright cotton accounts for does not exceed 1/3 of the fabric composite layer and the surrounding edge 223, and the thicknesses of the fabric composite layer and the surrounding edge 223 are 1.5-3.8 cm. Meanwhile, the first facing composite layer 233 of the elastic comfort layer 23 and the second facing composite layer 222 of the elastic support layer 22 are connected by a zipper or a hook and loop fastener.

Meanwhile, referring to fig. 5, in the elastic supporting layer 22, the top of the surrounding edge 223 extends horizontally and inwardly towards the lower surface of the second fabric composite layer 222 to form a first extending portion, and a first connecting piece 2231 is arranged along three edges of the first extending portion; the bottom of the second fabric composite layer 222 extends horizontally and inwards to the upper surface of the support adjusting core layer 221 to form a second extending portion, and a second connecting member 2221 matched with the first connecting member 2231 is arranged along three edges of the second extending portion. Wherein, the first connecting piece 2231 and the second connecting piece 2221 are zippers, magic tapes or snap fasteners, and are used for opening and closing the elastic supporting layer 22; the first extension part and the second extension part are fixedly connected by sewing without a connecting piece.

Specifically, in this embodiment, an opening/closing opening for attaching and detaching the bamboo spring unit 25 is provided on one side or continuous sides of the inner container cover 2211 covering the bamboo spring unit 25.

Meanwhile, as shown in fig. 6 and 7, in the liner cover 2211, a plurality of bamboo spring units 25 are directly arranged in a vertical matrix arrangement, and adjacent bamboo spring units 25 are separated by a separation line; alternatively, in the inner container cover 2211, the bamboo spring unit 25 is arranged therein in the form of a plurality of spring module packs 26. The spring module bag 26 specifically comprises a non-woven fabric bag 261 and a plurality of bamboo spring units 25 arranged in the non-woven fabric bag 261 in a vertical matrix arrangement mode; the adjacent bamboo spring units 25 on the spring module pack 26 are separated by a parting line.

The inner container 2211 is made of non-woven fabric, and the spring module packs 26 in the inner container 2211 are connected through the inner container 2211 made of non-woven fabric to form a spring bed net. Meanwhile, the spring module pack 26 is rectangular, square or triangular; the dividing lines on the spring module pack 26 are quilting dividing lines, zipper tape dividing lines, or thermocompression bonding dividing lines.

Further, referring to fig. 8, in the present embodiment, the bamboo spring body 251 of the bamboo spring unit 25 may be one of a "cylindrical spiral type independent bamboo spring (see fig. 8 a)", a "waist drum type independent bamboo spring" (see fig. 8b), a "bamboo spring-in-spring (see fig. 8 c)", or a combination of two or more of the above springs (see fig. 8 d). Correspondingly, the spring module pack 226 may also be constructed by arranging and combining the individually pocketed bamboo spring units 25 of the above-described type.

Meanwhile, the bamboo spring body 251 in the bamboo spring unit 25 may also be one of a "cylindrical spiral type independent bamboo spring" or a "bamboo spring-in-spring" with a spring guide rod 253, or a combination of two or more of the above springs, that is, the spring guide rod 253 is further fitted in the spring port of the bamboo spring body 251, see fig. 8 e; the spring guide 253 is obtained by the method of examples 4 to 6.

The using method comprises the following steps:

selecting bamboo spring units 25 with different rigidities (different specifications and different density grades) according to the support requirements of people with different weights; a plurality of bamboo spring units 25 may be directly arranged in the inner container cover 2211, or a spring module pack 26 may be arranged in the inner container cover 2211. The spring module bag 26 can be rectangular, square, triangular and the like, a plurality of bamboo spring units 25 are arranged and combined to form modules of rectangular or square and the like, and then the modules are wrapped by the non-woven fabric bag 261 and connected with other spring module bags 26, so that the bamboo spring core layer can be partially replaced.

Meanwhile, regarding the structural form of the bamboo spring body 251 in each bamboo spring unit 25, a bamboo spring form without the spring guide 253 (including one of "cylindrical spiral type independent bamboo spring", "waist drum type independent bamboo spring", "bamboo spring-in-spring", or two or more of the above-mentioned combined springs) may be selected according to the use requirement, or a form with the spring guide 253 (including one of "cylindrical spiral type independent bamboo spring" or "bamboo spring-in-spring", or two or more of the above-mentioned combined springs) may be selected.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A bamboo spring sofa comprises a base and a backrest, and is characterized in that a sofa seat surface of the base is provided with a bamboo spring support structure, and the support structure comprises an elastic support layer arranged on a base frame and an elastic comfort layer arranged on the elastic support layer;

the elastic supporting layer is formed by arranging a plurality of bamboo spring units in a vertical matrix;

the bamboo spring unit comprises a bamboo spring body and a cloth bag wrapping the bamboo spring body, and the preparation method of the bamboo spring body comprises the following steps:

a, chemical modification: oxidizing agent and carboxylic acid or hypochlorite are adopted according to the proportion of 1: 1, jointly treating the primary raw materials of the bamboo filaments in proportion at the temperature of 20-60 ℃ for 2-4 h; secondly, treating the bamboo filaments by using a strong alkali solution with the concentration of 5-20%, wherein the temperature is 40-80 ℃, and the treatment time is 2-4 hours; thirdly, the bamboo filaments processed by the steps are sent into an automatic leaching box and are leached automatically until leaching liquid is neutral; fourthly, drying the bamboo filaments treated in the third step at the temperature of 40-60 ℃ to adjust the water content to 20-30%;

b, dipping modification: firstly, immersing bamboo filaments into a nano inorganic oxide solution with the particle size of 10-50 nm, wherein the solid content is 15-50%, the temperature is 20-60 ℃, a vacuum negative pressure environment is realized through a vacuum tank, the immersion time is 2-4 h, the curing temperature is 100-140 ℃, and the curing time is 1-3 h; secondly, soaking the bamboo filaments into the modified epoxy resin, regulating and controlling a negative pressure environment through a vacuum tank, pressurizing and depressurizing once every 10min at a pressure of 0.5-5 MPa and a pressurizing and depressurizing speed of 0.02-1 MPa/min, and soaking for 1-4 h; then, carrying out surface curing at the curing temperature of 120-140 ℃ for 10-30 min;

(4) polishing the bamboo spring processed in the step (3); then, the bamboo spring with the same specification is divided into a plurality of density grades according to the mass difference from small to large, and finally the bamboo spring bodies with different specifications and different mass grades are obtained.

2. The bamboo spring sofa of claim 1 wherein the application surface of the back rest is also provided with a bamboo spring support structure.

3. The bamboo spring sofa as claimed in claim 1, wherein in the step (1), the bamboo fiber content of the bamboo filament is detected by infrared, and the relationship model between the bamboo elastic modulus and the bamboo fiber volume fraction is 40.129V_f+0.2219, dividing the bamboo filament into six grades according to the elastic modulus of 0-30 GPa and one grade per 5 GPa; wherein the relation model E is 40.129V_f+0.2219, E represents the elastic modulus of the bamboo filament, unit: GPa; v_fThe volume fraction of the bamboo fiber of the bamboo filament is expressed.

4. The bamboo spring sofa according to claim 1, wherein in the step (4), the bamboo spring bodies with different specifications refer to bamboo spring bodies with different wire diameters, calibers and free heights, and the bamboo spring bodies with the same wire diameter, calibers and free heights are divided into four quality grades according to the quality difference from small to large, so that the bamboo spring bodies with different specifications and different density grades are obtained.

5. The bamboo spring sofa of any of claims 1-4, wherein the base frame is a frame made of solid wood, composite board, metal or polymer composite material, and is composed of a plurality of longitudinal slats and a plurality of transverse slats disposed between adjacent longitudinal slats; the upper surface of the base frame is covered with a layer of balance net.

6. The bamboo spring sofa according to any one of claims 1-4, wherein the core layer of the elastic comfort layer is a comfort core layer, the outer periphery of the comfort core layer is wrapped with an inner liner skin, and the outer periphery of the inner liner skin is wrapped with a first fabric composite layer; the core layer of the elastic supporting layer is a supporting and adjusting core layer, the upper surface of the supporting and adjusting core layer is covered with a second fabric composite layer, and the peripheral side surfaces of the supporting and adjusting core layer are covered with surrounding edges; the elastic comfortable layer is connected with the elastic supporting layer through a zipper or a magic tape.

7. The bamboo spring sofa according to claim 6, wherein the top of the surrounding edge extends horizontally inwards to form a first extending part towards the lower surface of the second fabric composite layer, and a first connecting part is arranged along three edges of the first extending part; the bottom of the second fabric composite layer extends horizontally inwards to the upper surface of the support adjusting core layer to form a second extending part, and a second connecting part matched with the first connecting part is arranged along the inner edge of three edges of the second extending part; the first connecting piece and the second connecting piece are used for opening and closing the elastic supporting layer, and the first extending part and the second extending part are fixedly connected through sewing on the side without the connecting pieces.

8. The bamboo spring sofa of claim 6, wherein the bamboo spring body of the bamboo spring unit is one of a "cylindrical spiral type independent bamboo spring", a "waist drum type independent bamboo spring", a "bamboo spring in bamboo spring", or a combination of two or more of the above springs.

9. The bamboo spring sofa of claim 8, wherein a spring guide is further engaged in the spring opening of the bamboo spring body; the preparation method of the spring guide rod comprises the following steps:

(3) immersing the bamboo filaments treated in the step (2) into a silane coupling agent solution for 1-3 h, and then drying the bamboo filaments by microwave until the water content is 7-10%;