Bamboo fiber composite material bed core and preparation method thereof

Abstract

The invention discloses a bamboo fiber composite material bed core and a preparation method thereof, the bamboo fiber composite material bed core comprises a surface layer, a core layer and a protective layer, the surface layer is arranged on the upper surface of the core layer, the protective layer is arranged on the lower surface of the core layer, the surface layer is composed of 40-60% of polylactic acid bi-component low melting point fiber, 15-30% of spinnable bamboo fiber and 20-30% of phase change fiber, and the protective layer is arranged on the lower surface of the core layer. The core layer is composed of 30-45% of polylactic acid bi-component low-melting-point fiber, 30-60% of bamboo fiber crude fiber and 20-30% of antibacterial fiber, and the protective layer is composed of 45-55% of polylactic acid bi-component low-melting-point fiber, 20-30% of non-woven bamboo fiber and 20-30% of Shuelan fiber. The problem that an existing mattress is poor in heat preservation effect is solved, the moisture absorption and dissipation performance cannot be affected, the antibacterial fibers in the core layer are used for improving the bacterium resistance and bacteriostasis of the mattress, and the comfortable elastic fibers of the protection layer further guarantee the constant-temperature performance; the mattress disclosed by the invention has multiple functions of moisture absorption, perspiration, antibiosis, deodorization, constant temperature and static electricity prevention at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of daily necessities, and in particular to a bamboo fiber composite material bed core and a preparation method thereof. Background Art

[0002] As people's living standards improve, their requirements for sleep quality are also increasing. Mattresses, as one of the important daily necessities for sleep, are becoming more and more popular in homes, inns, hotels and other places. Common mattresses on the market include spring mattresses and plant fiber mattresses.

[0003] The plant fiber mattresses on the market mainly include coconut palm mattresses, jute mattresses and mountain palm mattresses. Among them, coconut palm mattresses and jute mattresses are prone to breeding bacteria and mites and mold, which can easily cause allergic reactions in people and are not good for human health. Mountain palm mattresses have limited raw materials, high costs and high prices. In addition, the above-mentioned traditional plant fiber mattresses are made by mixing fibers and adhesives and then hot pressing. The finished products are hard and easy to collapse, and the mechanical properties can only be adjusted by their own density.

[0004] Bamboo fiber is a natural fiber directly extracted from bamboo by physical and chemical methods. The raw materials are abundant, natural, green, environmentally friendly and degradable. It has been used in construction materials, textile materials, sewage treatment, daily necessities and other industries. In addition, the structural characteristics of bamboo fiber with multiple gaps, pores and cavities make it have excellent sound absorption performance (the average sound absorption coefficient can reach 0.71 when the thickness is 6cm) and excellent moisture absorption and dissipation (16h desorption rate reaches more than 99%), and it also has natural mildew resistance (level 1-2).

[0005] However, the thermal insulation performance of bamboo fiber is average. In order to enhance the thermal insulation performance, the thermal insulation effect is generally improved by strengthening the thermal insulation layer. The thermal insulation layer is usually composed of thermal insulation materials and waterproof materials. Once the thermal insulation layer is added, it is bound to affect the original moisture absorption and dissipation of bamboo fiber. Summary of the invention

[0006] The purpose of the present invention is to provide a bamboo fiber composite material bed core and a preparation method thereof, which has solved the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: a bamboo fiber composite material bed core, comprising a surface layer, a core layer and a protective layer, wherein the surface layer is arranged on the upper surface of the core layer, and the protective layer is arranged on the lower surface of the core layer;

[0008] The surface layer is composed of 40-60% polylactic acid bicomponent low melting point fiber, 15-30% spinnable bamboo fiber and 20-30% phase change fiber;

[0009] The core layer is composed of 30-45% polylactic acid bicomponent low melting point fiber, 30-60% bamboo fiber coarse fiber and 20-30% antibacterial fiber;

[0010] The protective layer is composed of 45-55% of polylactic acid bicomponent low melting point fiber, 20-30% of non-woven bamboo fiber and 20-30% of spandex fiber.

[0011] Preferably, the surface layer has a thickness of 3 mm and a density of 300 g / mm 2 .

[0012] Preferably, the core layer has a thickness of 1.2-18 cm and a density of 800-1200 g / cm 2 .

[0013] Preferably, the protective layer has a thickness of 3-6 mm and a density of 400 g / mm 2 .

[0014] A method for preparing a bamboo fiber composite material bed core, characterized in that it comprises a fully degradable raw material mattress core according to any one of claims 1 to 3, and the preparation method comprises the following steps:

[0015] 1. Weigh, loosen and mix the components according to the required proportions, pre-net, card, air-net and needle punch to obtain the surface layer, core layer and protective layer respectively;

[0016] 2. Then place the surface layer and protective layer on the top and bottom of the core layer respectively, and then send the whole into an oven for heating and melting, cooling and shaping;

[0017] 3. Cut the product into small pieces according to its size to obtain the cushion core.

[0018] Preferably, the cotton is humidified during the loosening and mixing in step 1, the humidity of the mixed material is 60-70%, and the mixing time is 120 seconds for each 60 kg mixing.

[0019] Preferably, in step 1, a carding machine is required to perform the carding work, and the carding machine includes a cylinder, a doffer, and a plurality of groups of working rollers, wherein the angle of the card cloth tooth tip of the cylinder is 10°, the angle of the card cloth tooth tip of the doffer is 35°, the angle of the card cloth tooth tip of the plurality of working rollers is 25°, and the direction of the card cloth tooth tip of the cylinder is opposite to the direction of the card cloth tooth tip of the doffer and the direction of the card cloth tooth tip of the plurality of working rollers.

[0020] Preferably, the working linear speed of the cylinder is 1130 m / min, the linear speed of the doffer is 33 m / min, the speed ratio of the cylinder to the doffer is 1:34, the working rolls are arranged in 5 groups and spaced apart along the circumference of the cylinder, and the linear speeds of the 5 groups of working rolls are 32 m / min for the first group, 32 m / min for the second group, 31 m / min for the second group, 28 m / min for the third group, 25 m / min for the fourth group, and 20 m / min for the fifth group in the order of combing the working rolls, and the gauges between each group of working rolls and the cylinder are 90 inch, 69 inch, 15 inch, 35 inch, and 28 inch, respectively.

[0021] Preferably, the oven in step 2 is a stepped circulating hot air heating device, with a first section temperature of 152-160 degrees Celsius, a second section temperature of 168-174 degrees Celsius, and a third section temperature of 172-178 degrees Celsius.

[0022] Preferably, the conveying speed of the oven in step 2 is 2.2 m / min-4.5 m / min.

[0023] Compared with the prior art, the beneficial effects of the present invention include: the present invention is composed of a surface layer, a core layer and a protective layer, wherein the surface layer, the core layer and the protective layer are composed of a layered composite of spinnable bamboo fibers, bamboo fiber coarse fibers and non-woven bamboo fibers, which not only solves the problem of poor thermal insulation effect of previous mattresses, but also does not affect the moisture absorption and dissipation properties, and the antibacterial fiber in the core layer is used to improve the antibacterial and antibacterial properties of the mattress, and the stretch fiber in the protective layer further ensures the constant temperature performance, so that the mattress disclosed by the present invention has multiple functions of moisture absorption, perspiration, antibacterial, deodorization, constant temperature and anti-static. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the production process of the present invention. DETAILED DESCRIPTION

[0025] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0026] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0027] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "connected" may be directly connected or indirectly connected through intermediate components (elements). The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0028] It should be noted that the concepts such as "first" and "second" mentioned in the present invention are only used to distinguish between devices, modules or units, and are not used to limit these devices, modules or units to be different devices, modules or units, nor are they used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0029] Example 1

[0030] like Figure 1 A bamboo fiber composite material bed core shown comprises a surface layer, a core layer and a protective layer, wherein the surface layer is arranged on the upper surface of the core layer, and the protective layer is arranged on the lower surface of the core layer;

[0031] The surface layer is composed of 45% polylactic acid bicomponent low melting point fiber, 28% spinnable bamboo fiber and 27% phase change fiber, with a thickness of 3mm and a density of 300g / mm 2 ;

[0032] The core layer is composed of 40% polylactic acid bicomponent low melting point fiber, 32% bamboo fiber coarse fiber and 28% antibacterial fiber, with a thickness of 18cm and a density of 800-1200g / cm 2 ;

[0033] The protective layer is composed of 55% polylactic acid bicomponent low melting point fiber, 26% non-woven bamboo fiber and 29% stretch fiber, with a thickness of 6mm and a density of 400g / mm 2 .

[0034] The preparation method of the bamboo fiber composite material bed core provided as above is as follows:

[0035] 1. Weigh, loosen and mix the components according to the required proportions, pre-net, card, air-net and needle punch to obtain the surface layer, core layer and protective layer respectively;

[0036] 2. Then place the surface layer and protective layer on the top and bottom of the core layer respectively, and then send the whole into an oven for heating and melting, cooling and shaping;

[0037] 3. Cut the product into small pieces according to its size to obtain the cushion core.

[0038] Wherein, the cotton is humidified and mixed during the loosening and mixing in step 1, the mixed material humidity is 60%, and the mixing time is 120 seconds for each 60 kg mixing.

[0039] Among them, in step 1, a carding machine is required to perform carding work, and the carding machine includes a cylinder, a doffer and a plurality of groups of working rollers in which the tooth tips of the card clothing are set, wherein the angle of the tooth tip of the card clothing of the cylinder is 10°, the angle of the tooth tip of the card clothing of the doffer is 35°, the angle of the tooth tip of the card clothing of the plurality of working rollers is 25°, and the direction of the tooth tip of the card clothing of the cylinder is opposite to the direction of the tooth tip of the card clothing of the doffer and the direction of the tooth tip of the card clothing of the plurality of working rollers.

[0040] Among them, the working linear speed of the cylinder is 1130 m / min, the linear speed of the doffer is 33 m / min, the speed ratio of the cylinder to the doffer is 1:34, the working rolls are adopted in 5 groups, and are arranged at intervals along the circumference of the cylinder, and the linear speeds of the 5 groups of working rolls are 32 m / min for the first group, 32 m / min for the second group, 31 m / min for the second group, 28 m / min for the third group, 25 m / min for the fourth group, and 20 m / min for the fifth group in the order of combing the working rolls.

[0041] Among them, there are 5 groups of working rollers, and the gauges between each group of working rollers and the cylinder are 90 inches, 69 inches, 15 inches, 35 inches, and 28 inches respectively.

[0042] Among them, the oven in step 2 is a stepped circulating hot air heating device, with a first section temperature of 167 degrees Celsius, a second section temperature of 190 degrees Celsius, and a third section temperature of 203 degrees Celsius.

[0043] Wherein, the conveying speed of the oven in step 2 is 2.2 m / min.

[0044] Example 2

[0045] like Figure 1 A bamboo fiber composite material bed core shown comprises a surface layer, a core layer and a protective layer, wherein the surface layer is arranged on the upper surface of the core layer, and the protective layer is arranged on the lower surface of the core layer;

[0046] The surface layer is composed of 57% polylactic acid bicomponent low melting point fiber, 18% spinnable bamboo fiber and 25% phase change fiber, with a thickness of 3mm and a density of 300g / mm 2 ;

[0047] The core layer is composed of 31% polylactic acid bicomponent low melting point fiber, 48% bamboo fiber coarse fiber and 21% antibacterial fiber, with a thickness of 1.2cm and a density of 800-1200g / cm 2 ;

[0048] The protective layer is composed of 55% polylactic acid bicomponent low melting point fiber, 26% non-woven bamboo fiber and 29% stretch fiber, with a thickness of 3mm and a density of 400g / mm 2 .

[0049] The preparation method of the bamboo fiber composite material bed core provided as above is as follows:

[0050] 1. Weigh, loosen and mix the components according to the required proportions, pre-net, card, air-net and needle punch to obtain the surface layer, core layer and protective layer respectively;

[0051] 2. Then place the surface layer and protective layer on the top and bottom of the core layer respectively, and then send the whole into an oven for heating and melting, cooling and shaping;

[0052] 3. Cut the product into small pieces according to its size to obtain the cushion core.

[0053] Wherein, the cotton is humidified and mixed during the loosening and mixing in step 1, the mixed material humidity is 70%, and the mixing time is 120 seconds for each 60 kg mixing.

[0054] Among them, in step 1, a carding machine is required to perform carding work, and the carding machine includes a cylinder, a doffer and a plurality of groups of working rollers in which the tooth tips of the card clothing are set, wherein the angle of the tooth tip of the card clothing of the cylinder is 10°, the angle of the tooth tip of the card clothing of the doffer is 35°, the angle of the tooth tip of the card clothing of the plurality of working rollers is 25°, and the direction of the tooth tip of the card clothing of the cylinder is opposite to the direction of the tooth tip of the card clothing of the doffer and the direction of the tooth tip of the card clothing of the plurality of working rollers.

[0055] Among them, the working linear speed of the cylinder is 1130 m / min, the linear speed of the doffer is 33 m / min, the speed ratio of the cylinder to the doffer is 1:34, the working rolls are adopted in 5 groups, and are arranged at intervals along the circumference of the cylinder, and the linear speeds of the 5 groups of working rolls are 32 m / min for the first group, 32 m / min for the second group, 31 m / min for the second group, 28 m / min for the third group, 25 m / min for the fourth group, and 20 m / min for the fifth group in the order of combing the working rolls.

[0056] Among them, there are 5 groups of working rollers, and the gauges between each group of working rollers and the cylinder are 90 inches, 69 inches, 15 inches, 35 inches, and 28 inches respectively.

[0057] Among them, the oven in step 2 is a stepped circulating hot air heating device, with a first section temperature of 134 degrees Celsius, a second section temperature of 168 degrees Celsius, and a third section temperature of 188 degrees Celsius.

[0058] Wherein, the conveying speed of the oven in step 2 is 4.2 m / min.

[0059] Example 3

[0060] like Figure 1 A bamboo fiber composite material bed core shown comprises a surface layer, a core layer and a protective layer, wherein the surface layer is arranged on the upper surface of the core layer, and the protective layer is arranged on the lower surface of the core layer;

[0061] The surface layer is composed of 46% polylactic acid bicomponent low melting point fiber, 25% spinnable bamboo fiber and 29% phase change fiber, with a thickness of 3mm and a density of 300g / mm 2 ;

[0062] The core layer is composed of 31% polylactic acid bicomponent low melting point fiber, 43% bamboo fiber coarse fiber and 26% antibacterial fiber, with a thickness of 6.8cm and a density of 800-1200g / cm 2 ;

[0063] The protective layer is composed of 47% polylactic acid bicomponent low melting point fiber, 25% non-woven bamboo fiber and 28% stretch fiber, with a thickness of 4mm and a density of 400g / mm 2 .

[0064] The preparation method of the bamboo fiber composite material bed core provided as above is as follows:

[0065] 1. Weigh, loosen and mix the components according to the required proportions, pre-net, card, air-net and needle punch to obtain the surface layer, core layer and protective layer respectively;

[0066] 2. Then place the surface layer and protective layer on the top and bottom of the core layer respectively, and then send the whole into an oven for heating and melting, cooling and shaping;

[0067] 3. Cut the product into small pieces according to its size to obtain the cushion core.

[0068] Wherein, the cotton is humidified and mixed during the loosening and mixing in step 1, the mixed material humidity is 64%, and the mixing time is 120 seconds for each 60 kg mixing.

[0069] Among them, in step 1, a carding machine is required to perform carding work, and the carding machine includes a cylinder, a doffer and a plurality of groups of working rollers in which the tooth tips of the card clothing are set, wherein the angle of the tooth tip of the card clothing of the cylinder is 10°, the angle of the tooth tip of the card clothing of the doffer is 35°, the angle of the tooth tip of the card clothing of the plurality of working rollers is 25°, and the direction of the tooth tip of the card clothing of the cylinder is opposite to the direction of the tooth tip of the card clothing of the doffer and the direction of the tooth tip of the card clothing of the plurality of working rollers.

[0070] Among them, the working linear speed of the cylinder is 1130 m / min, the linear speed of the doffer is 33 m / min, the speed ratio of the cylinder to the doffer is 1:34, the working rolls are adopted in 5 groups, and are arranged at intervals along the circumference of the cylinder, and the linear speeds of the 5 groups of working rolls are 32 m / min for the first group, 32 m / min for the second group, 31 m / min for the second group, 28 m / min for the third group, 25 m / min for the fourth group, and 20 m / min for the fifth group in the order of combing the working rolls.

[0071] Among them, there are 5 groups of working rollers, and the gauges between each group of working rollers and the cylinder are 90 inches, 69 inches, 15 inches, 35 inches, and 28 inches respectively.

[0072] Among them, the oven in step 2 is a stepped circulating hot air heating device, with a first section temperature of 167 degrees Celsius, a second section temperature of 190 degrees Celsius, and a third section temperature of 203 degrees Celsius.

[0073] Wherein, the conveying speed of the oven in step 2 is 2.5 m / min.

[0074] It is important to know that the conveying speed of the oven is inversely proportional to the thickness of the product. The conveying speed product thickness / data are as follows:

[0075] A 1.2 cm thick mesh belt travels 4.5 m per minute;

[0076] A 1.5 cm thick mesh belt travels 4.2 m per minute;

[0077] A 2-cm thick mesh belt travels 4 meters per minute;

[0078] A 3 cm thick mesh belt travels 3.6 m per minute;

[0079] A 5-cm thick mesh belt travels 2.6 meters per minute;

[0080] The 7 cm thick mesh belt travels 2.2 meters per minute.

[0081] Performance testing

[0082] Test 1: Durability: According to the national standard GB / T 26706-2011 "Soft Furniture Palm Fiber Elastic Mattress", the plant fiber bed cores prepared in Examples 1 to 3 were tested, and the test results are as follows:

[0083] Durability requirements: Test times: 30,000 times. After the test, the core material should not be torn or dislocated; the inner core fiber should not be obviously broken or debris generated; the outer fabric should be intact, with no fiber sticking out;

[0084] The compression rebound rate of the plant fiber bed cores prepared in Examples 1 to 3 is ≥ 90%, indicating that the prepared bed cores have good rebound ability;

[0085] GB / T 26706-2011 "Soft Furniture Cotton Fiber Elastic Mattress" requires that the compression permanent deformation rate of cotton fiber mattresses is: ≤12%. The compression permanent deformation rate of the plant fiber bed cores prepared in Examples 1 to 3 is ≤9%, which is lower than the requirement for the compression permanent deformation rate of cotton fiber mattresses, indicating that the bed core has good stability and strong deformation resistance; and the elastic coefficient is ≥537N / mm, indicating that the bed core has good supporting capacity.

[0086] Test 2: According to "GB 18587-2001 Limits of Hazardous Substances Release from Carpets, Carpet Pads and Carpet Adhesives for Indoor Decoration and Renovation Materials", "GB / T 18204.26-2000 Determination of Formaldehyde in the Air of Public Places" and GB / T 26706-2011 "Soft Furniture Cotton Fiber Elastic Mattresses", UV-Vis analysis was used to detect the content of free formaldehyde. The limit requirement was 0.050 mg / ㎡h. The detection values ​​(MDL) of Examples 1 to 3 were 0.011 mg / ㎡h, 0.013 mg / ㎡h, and 0.015 mg / ㎡h, respectively, which were all lower than the limit. The result was ND (not detected, <MDL).

[0087] Test 3: The mattresses prepared in Examples 1 to 3 were placed in a sealed box. After 24 hours, the negative ion concentration was measured at a distance of 1 cm from the mattress sample. The average value of the test result was 1.03×10 3 , indicating that the mattress does not release formaldehyde, and can release negative ions and purify the air.

[0088] Test 4: The moisture-proof performance of the mattress is evaluated by the ASTM F3340-18 standard. The ASTM F3340-18 standard test shows that this floor mat has a good moisture-proof effect and can effectively block moisture from the ground, thereby retaining body heat, keeping the body comfortable, and having good thermal insulation.

[0089] R-values ​​are calculated according to ASTM F3340-18 standard to obtain thermal properties and insulation performance;

[0090] The R value indicates the thermal performance and impedance of the moisture-proof mat. The larger the R value, the stronger the ability of the moisture-proof mat to isolate the cold ground.

[0091] R value is 0-1.9: only suitable for use in hot weather (such as summer);

[0092] R value is 2-3: suitable for use in two to three seasons (e.g. spring, summer and autumn);

[0093] R value is 3-4: can be used all year round, even in winter;

[0094] R-value above 4.5: winter use and extreme temperatures;

[0095] The test results of Examples 1-3 are as follows:

[0096] Example 1, the mattress thickness is 3mm+18cm+6mm, the R value is 7.6, and it can be used in winter and extreme temperatures;

[0097] Example 2, the mattress thickness is 3mm+1.2cm+3mm, the R value is 3.4, and it can be used all year round, including winter;

[0098] Example 3, the mattress thickness is 3mm+6.8cm+4mm, the R value is 4.9, and it can be used in winter and extreme temperatures.

[0099] Since the thermal insulation performance of mattresses varies with thickness, the present invention solves the problem of poor thermal insulation performance of mattresses in the past based on the current common thickness mattresses, and does not affect the moisture absorption and dissipation performance. Antibacterial fibers are used to improve the antibacterial and antibacterial properties of the mattress, and the elastic fibers are used to further ensure the constant temperature performance.

[0100] In addition, combined with the antibacterial, deodorizing and antistatic functions of the bamboo fiber itself, the mattress disclosed in the present invention has multiple functions such as moisture absorption, perspiration, antibacterial, deodorizing, constant temperature and antistatic.

[0101] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bamboo fiber composite material bed core, characterized in that: It comprises a surface layer, a core layer and a protective layer, wherein the surface layer is arranged on the upper surface of the core layer, and the protective layer is arranged on the lower surface of the core layer; The surface layer is composed of 40-60% polylactic acid bicomponent low melting point fiber, 15-30% spinnable bamboo fiber and 20-30% phase change fiber; The core layer is composed of 30-45% polylactic acid bicomponent low melting point fiber, 30-60% bamboo fiber coarse fiber and 20-30% antibacterial fiber; The protective layer is composed of 45-55% of polylactic acid bicomponent low melting point fiber, 20-30% of non-woven bamboo fiber and 20-30% of spandex fiber.

2. The bamboo fiber composite material bed core according to claim 1, characterized in that: The thickness of the surface layer is 3 mm and the density is 300 g / mm 2 .

3. The bamboo fiber composite material bed core according to claim 1, characterized in that: The thickness of the core layer is 1.2-18 cm, and the density is 800-1200 g / cm 2 .

4. The bamboo fiber composite material bed core according to claim 1, characterized in that: The protective layer is 3-6 mm thick and has a density of 400 g / mm 2 .

5. A method for preparing a bamboo fiber composite material bed core, characterized in that: The raw material fully degradable cushion core according to any one of claims 1 to 3 is prepared by the following steps:

1. Weigh, loosen and mix the components according to the required proportions, pre-net, card, air-net and needle punch to obtain the surface layer, core layer and protective layer respectively; 2. Then place the surface layer and protective layer on the top and bottom of the core layer respectively, and then send the whole into an oven for heating and melting, cooling and shaping; 3. Cut the product into small pieces according to its size to obtain the cushion core.

6. The method for preparing a bamboo fiber composite material bed core according to claim 1, characterized in that: In step 1, the cotton is humidified during the loosening and mixing, the humidity of the mixed material is 60-70%, and the mixing time is 120 seconds for each 60 kg mixing.

7. The method for preparing a bamboo fiber composite material bed core according to claim 1, characterized in that: In step 1, a carding machine is required to perform carding work, and the carding machine includes a cylinder, a doffer, and a plurality of groups of working rollers. The tooth tip angle of the card cloth of the cylinder is 10°, the tooth tip angle of the card cloth of the doffer is 35°, and the tooth tip angle of the card cloth of the plurality of working rollers is 25°. The direction of the tooth tip of the card cloth of the cylinder is opposite to the direction of the tooth tip of the card cloth of the doffer and the direction of the tooth tip of the card cloth of the plurality of working rollers.

8. The method for preparing a bamboo fiber composite material bed core according to claim 1, characterized in that: The working linear speed of the cylinder is 1130 m / min, the linear speed of the doffer is 33 m / min, the speed ratio of the cylinder to the doffer is 1:34, the working rolls are in 5 groups, and are arranged at intervals along the circumference of the cylinder, the linear speeds of the 5 groups of working rolls are 32 m / min for the first group, 32 m / min for the second group, 31 m / min for the second group, 28 m / min for the third group, 25 m / min for the fourth group, and 20 m / min for the fifth group in the order of combing the working rolls, and the gauges between each group of working rolls and the cylinder are 90 inch, 69 inch, 15 inch, 35 inch, and 28 inch, respectively.

9. The method for preparing a bamboo fiber composite material bed core according to claim 1, characterized in that: The oven in step 2 is a stepped circulating hot air heating device, with a first section temperature of 152-160 degrees Celsius, a second section temperature of 168-174 degrees Celsius, and a third section temperature of 172-178 degrees Celsius.

10. The method for preparing a bamboo fiber composite material bed core according to claim 1, characterized in that: The conveying speed of the oven in step 2 is 2.2 m / min-4.5 m / min.

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