Plant fiber folder and method of making same

Abstract

The present application belongs to the technical field of resource utilization, and particularly relates to a plant fiber file folder and a preparation method thereof. The plant fiber file folder provided by the present application is environment-friendly. The plant fiber is used as raw material in the present application, and the plant fiber is naturally renewable, has good biodegradability, is environment-friendly, does not pollute the environment in the use and production process, does not occupy land resources, does not generate garbage problems, and is harmless to human bodies. The plant fiber file folder provided by the present application has excellent mechanical properties. The plant fiber has the characteristics of low density, high specific strength, high specific modulus, good heat insulation and barrier properties, and the file folder has high longitudinal and transverse tensile strength. Under the condition of ensuring various tensile strengths, the lightweight and practicability of the file folder are realized, the number of file folders contained in a unit volume is increased, and office space is saved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of resource utilization, and particularly relates to a plant fiber file folder and a preparation method thereof. BACKGROUND

[0002] Single-piece file folders are usually made of a piece of plastic and can store a small amount of files, usually only a few tens of pages, and are suitable for storing some important or frequently used files, facilitating access and management. They are widely used in daily office work. Common single-piece file folders are made of polypropylene or polyvinyl chloride.

[0003] Chinese Patent CN211054766U discloses a file folder with good waterproof performance, which comprises a plastic plate and a transparent waterproof bag. By arranging the plastic plate 1, the transparent waterproof bag 2, the metal gasket 3, the fastener 4, the semicircular ring 9 and the fixing seat 10, the problem of poor waterproof performance of the file folder is solved.

[0004] Chinese Patent CN213167475U discloses a file folder for financial accounting, which comprises a file folder body, a high-strength layer arranged on the surface of the file folder body, a waterproof layer arranged on the surface of the high-strength layer, a PVC plastic layer included in the high-strength layer, a polyoxymethylene plastic layer bonded to the surface of the PVC plastic layer, and a stainless steel plate plastic layer bonded to the surface of the polyoxymethylene plastic layer. The file folder has the advantages of improved strength and waterproof performance.

[0005] However, the file folder in the above-mentioned patent uses a large amount of non-degradable plastic, which affects the environment during production and use. SUMMARY

[0006] The present application provides a plant fiber file folder and a preparation method thereof. The plant fiber file folder provided by the present application uses plant fiber and biodegradable plastic to replace non-degradable plastic, which is environmentally friendly.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] The present application provides a plant fiber file folder, which comprises an outer skin. The outer skin is L-shaped. The outer skin is made of plant fiber raw material.

[0009] The plant fiber raw material comprises plant fiber felt and / or plant fiber prepreg.

[0010] The plant fiber raw material comprises plant fiber and thermoplastic wire.

[0011] The thermoplastic wire comprises one or both of biodegradable thermoplastic wire and non-degradable thermoplastic wire.

[0012] Preferably, the plant fiber comprises one or more of agricultural and forestry production processing residues and non-recycled fibers;

[0013] The agricultural and forestry production processing residues comprise one or more of rice husk, straw, wheat straw, corn stalk, cotton stalk, wood chips and bamboo chips;

[0014] The non-recycled fibers comprise one or more of bamboo fiber, hemp fiber, palm fiber, abaca fiber, coconut shell fiber and cotton fiber;

[0015] The non-degradable thermoplastic filaments comprise one or more of polypropylene, polyvinyl chloride, polystyrene and acrylonitrile butadiene propylene;

[0016] The biodegradable thermoplastic filaments comprise one or more of polylactic acid, polyhydroxybutyric acid valeric acid copolyester and polyethylene terephthalate.

[0017] Preferably, the thickness of the plant fiber felt is 3-5mm, and the area density is 50-400g / m 2 ;

[0018] The thickness of the plant fiber prepreg is 0.5-1.0mm, and the area density is 80-200g / m 2 .

[0019] Preferably, the fineness of the plant fiber is 1-10tex, and the length is independently 20-80mm;

[0020] The fineness of the thermoplastic filament is 0.2-9tex, and the length is 40-100mm.

[0021] Preferably, the length of the outer skin is 372-450mm, the width is 260-307mm, and the thickness is 0.1-2mm.

[0022] Preferably, the plant fiber file folder is also provided with a circular arc opening and / or a pen clip;

[0023] The radius of the circular arc opening is 10-20mm.

[0024] Preferably, the pen clip is arranged at the top of the outer skin; the shape of the pen clip is a circular arc; the radius of the pen clip is 4-8mm; and the number of the pen clip is not less than 1.

[0025] The application also provides a preparation method of the plant fiber file folder described in the above scheme, comprising the following steps:

[0026] (1) hot pressing after laying the plant fiber felt or the plant fiber prepreg to obtain a plant fiber composite sheet;

[0027] (2) cutting the plant fiber composite sheet, and then folding the long edge and sealing the folded long edge to obtain the plant fiber folder.

[0028] Preferably, the hot pressing comprises high-pressure hot pressing, medium-pressure hot pressing and low-pressure hot pressing in sequence.

[0029] The high-pressure hot pressing has a pressure of 4-5 MPa, a temperature of 175-275 DEG C and a time of 2-15 s.

[0030] The medium-pressure hot pressing has a pressure of 2-3 MPa, a temperature of 140-175 DEG C and a time of 40-50 s.

[0031] The low-pressure hot pressing has a pressure of 0.5-1 MPa, a temperature of 100-120 DEG C and a time of not less than 50 s.

[0032] Preferably, the speed of the hot pressing is 1.5-20 m / min.

[0033] The plant fiber folder provided by the application is environment-friendly: the plant fiber (specifically in the form of plant fiber felt and / or plant fiber prepreg) and biodegradable plastic are used as raw materials to replace non-degradable plastic, the plant fiber is naturally renewable and has good biodegradability, is environment-friendly, does not pollute the environment during use and production, does not occupy land resources, does not generate garbage problems, and is harmless to the human body.

[0034] The plant fiber folder provided by the application has excellent mechanical properties, the plant fiber has the characteristics of low density, high specific strength, high specific modulus, good heat insulation and barrier properties, the folder has high longitudinal and transverse tensile strength, the folder is lightweight and practical under the condition of ensuring the tensile strength, the folder holding capacity per unit volume is increased, and office space is saved.

[0035] The plant fiber composite sheet used in the plant fiber folder has good waterproofness and surface smoothness, the profile arithmetic average deviation can be 0.05-6.00, texture can be printed, the problems of rough matte surface and difficulty in customizing patterns of the existing sheet are overcome, and the plant fiber folder can be used in business cards, pen bodies, book covers, wrapped straws, stamped cutlery and building exterior packaging and the like, and has a wide application prospect. The plant fiber folder provided by the application has novel design, unique and beautiful appearance, visible natural fiber texture throughout the body, can realize color diversification of the folder through dyeing of the natural fiber, has smooth surface, is green and fashionable, has low cost and strong market competitiveness.

[0036] Further, the length of the outer skin is 372-450 mm, the width is 260-307 mm, and the thickness is 0.1-2 mm. The plant fiber folder provided by the application is high-strength and super-thin, and the thickness of the folder can be as thin as 0.1 mm under the premise of ensuring the mechanical properties, thereby realizing the thinness of the folder and improving the utilization efficiency of office space.

[0037] The application further provides a preparation method of the plant fiber folder.

[0038] The plant fiber felt and / or the plant fiber prepreg are used as raw materials, the plant fiber felt and the plant fiber prepreg are convenient to transport and process, and there is no need to prepare materials in the factory, thereby saving the space cost and energy consumption cost of enterprises. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort. The style of the plant fiber folder provided by the application includes but is not limited to the following forms.

[0040] Figure 1 The unfolded size diagram of the plant fiber folder provided by the application is shown in the following figure.

[0041] Figure 2 The closed size diagram of the plant fiber folder provided by the application is shown in the following figure.

[0042] Figure 3 The process flow chart of the preparation method of the plant fiber folder provided by the application is shown in the following figure.

[0043] Figure 4 The unfolded diagram of the plant fiber folder prepared in Example 1 of the application is shown in the following figure, wherein the vertical dotted line is the folding line, and the area between the horizontal dotted line and the bottom edge is the gluing area.

[0044] Figure 5 The front view of the plant fiber folder prepared in Example 1 of the application is shown in the following figure.

[0045] Figure 6 The oblique view of the plant fiber folder prepared in Example 1 of the application is shown in the following figure.

[0046] Figure 7 A side view of a plant fiber file folder made according to the present application. DETAILED DESCRIPTION

[0047] The present application provides a plant fiber file folder, comprising an outer skin; the outer skin is in the shape of L; the outer skin is made of plant fiber raw materials;

[0048] The plant fiber raw materials comprise plant fiber felt and / or plant fiber prepreg;

[0049] The plant fiber raw materials comprise plant fiber and thermoplastic filaments;

[0050] The thermoplastic filaments comprise one or both of biodegradable thermoplastic filaments and non-degradable thermoplastic filaments.

[0051] In the present application, the outer skin is made of plant fiber raw materials; the plant fiber raw materials comprise plant fiber; the plant fiber preferably comprises one or several of agricultural and forestry production and processing residues and non-recycled fibers; the agricultural and forestry production and processing residues preferably comprise one or several of rice husk, straw, wheat straw, corn stalks, cotton rods, wood chips and bamboo chips; the non-recycled fibers preferably comprise one or several of bamboo fibers, hemp fibers, palm fibers, abaca fibers, coconut shell fibers and cotton fibers. The present application realizes high-value utilization of waste, saves resources, protects the environment and has significant economic benefits by using agricultural and forestry production and processing residues.

[0052] The present application uses plant fibers, which can be woven and spun into different structures and forms through processes such as weaving and spinning, and different degrees of smoothness and patterns can be made on the surface of the file folder through mold pressing, improving the aesthetic and personalized degree of the file folder. In addition, the plant fibers used in the present application can also be compounded with other materials, such as plastics and resins, to form various types of composite materials to meet different functional requirements, such as waterproof, fireproof and mildewproof properties, and the present application provides a new idea for subsequent research of file folders.

[0053] In the present application, the plant fiber raw materials comprise thermoplastic filaments; the thermoplastic filaments comprise one or both of biodegradable thermoplastic filaments and non-degradable thermoplastic filaments; the non-degradable thermoplastic filaments preferably comprise one or several of polypropylene, polyvinyl chloride, polystyrene and acrylonitrile butadiene propylene; the biodegradable thermoplastic filaments preferably comprise one or several of polylactic acid, polyhydroxybutyric acid valeric acid copolyester and polyethylene terephthalate.

[0054] In the present application, the content of the plant fiber in the plant fiber raw material is preferably 2-85 wt%, more preferably 40-60 wt%, and further preferably 50 wt%, the content of the thermoplastic filament is preferably 15-98 wt%, more preferably 40-60 wt%, and further preferably 50 wt%; when the thermoplastic filament contains biodegradable thermoplastic filament and non-degradable thermoplastic filament at the same time, the content of the biodegradable thermoplastic filament is preferably greater than 0 and less than 100 wt%, more preferably 5-85 wt%, and the content of the non-degradable thermoplastic filament is preferably greater than 0 and less than 100 wt%, more preferably 15-95 wt%.

[0055] In the present application, the thickness of the plant fiber mat is preferably 3-5 mm, more preferably 3.5-4.5 mm, and further preferably 4.0 mm, and the area density is preferably 50-400 g / m 2 , more preferably 150-250 g / m 2 , and further preferably 190-220 g / m 2 .

[0056] In the present application, the thickness of the plant fiber prepreg is preferably 0.5-1.0 mm, more preferably 0.6-0.9 mm, and further preferably 0.7-0.8 mm, and the area density is preferably 80-200 g / m 2 , more preferably 100-180 g / m 2 , and further preferably 130-150 g / m 2 .

[0057] In the present application, the preparation method of the plant fiber prepreg comprises the following steps: hot pressing (denoted as first hot pressing) after impregnating the plant fiber mat with resin to obtain the plant fiber prepreg.

[0058] In the present application, the impregnation time is preferably 5-20 min, more preferably 8-10 min, and the temperature is preferably 120-195℃, more preferably 145-185℃; the resin preferably comprises one or more of polypropylene, polyvinyl chloride, polystyrene, acrylonitrile butadiene propylene, polylactic acid, polyhydroxybutyric acid valeric acid copolyester, and polyethylene terephthalate.

[0059] In the present application, the first hot pressing preferably comprises high-pressure hot pressing, medium-pressure hot pressing, and low-pressure hot pressing in sequence; the pressure of the high-pressure hot pressing is preferably 4-5 MPa, more preferably 4.2-4.8 MPa, and further preferably 4.4-4.6 MPa, the temperature is preferably 175-200℃, more preferably 180-190℃, and further preferably 183-187℃, the holding time is 10-30 s, more preferably 12-20 s, and further preferably 15-18 s.

[0060] In the present application, the pressure of the medium-pressure hot pressing is preferably 2-3 MPa, more preferably 2.3-2.7 MPa, and further preferably 2.5 MPa, and the temperature is preferably 140-175°C, more preferably 150-165°C, and further preferably 155-160°C, and the holding time is preferably 40-50 s, more preferably 42-48 s, and further preferably 44-46 s.

[0061] In the present application, the pressure of the low-pressure hot pressing is preferably 0.5-1 MPa, more preferably 0.6-0.9 MPa, and further preferably 0.7-0.8 MPa, the temperature is preferably 90-120°C, more preferably 95-115°C, and further preferably 100-110°C, and the holding time is preferably not less than 50 s, more preferably 55-80 s, and further preferably 60-70 s. The present application pre-cures the plant fiber felt impregnated with the resin by the first hot pressing.

[0062] In the present application, the fineness of the plant fiber is preferably 1-10 tex, more preferably 5-20 tex, and further preferably 8-10 tex, and the length is independently preferably 20-80 mm, more preferably 50-70 mm, and further preferably 55-65 mm; the fineness of the thermoplastic filament is preferably 0.2-9 tex, more preferably 2-8 tex, and further preferably 4-6 tex, and the length is preferably 40-100 mm, more preferably 70-90 mm, and further preferably 80 mm.

[0063] In the present application, the length of the outer skin is preferably 372-450 mm, more preferably 380-420 mm, and further preferably 390-410 mm, the width is preferably 260-307 mm, more preferably 270-300 mm, and further preferably 280-290 mm, the thickness is preferably 0.1-2 mm, more preferably 0.12-1.5 mm, and further preferably 0.2-0.5 mm, such as 0.25 mm, 0.30 mm, 0.35 mm, 0.40 mm, and 0.45 mm, and specifically as shown in Figure 1 and Figure 2 .

[0064] In the present application, the plant fiber file folder is preferably further provided with a circular arc opening and / or a pen clip; the radius of the circular arc opening is preferably 10-20 mm, more preferably 12-18 mm, and further preferably 14-16 mm; and the distance from the circular arc opening to the nearest vertex (the distance between the center and the vertex) is preferably 90-100 mm, and more preferably 95 mm.

[0065] In the present application, the pen clip is preferably arranged at the top of the outer skin; the shape of the pen clip is preferably a circular arc; the radius of the pen clip is preferably 4-8 mm, more preferably 5-7 mm, and further preferably 6 mm; the number of pen clips is preferably not less than 1, more preferably 2-5, and further preferably 3-4; the distance from the pen clip to the nearest corner (from the notch to the corner) is preferably 50 mm; the distance between the pen clip and the pen clip (from the notch to the notch) is preferably 10 mm, as shown in Figure 1 and Figure 2 .

[0066] The present application also provides a preparation method of the plant fiber file folder described in the above scheme, comprising the following steps:

[0067] (1) hot pressing after laying up of the plant fiber felt or the plant fiber prepreg to obtain a plant fiber composite sheet;

[0068] (2) cutting the plant fiber composite sheet, folding the long edge, and then edge sealing the folded long edge to obtain a plant fiber file folder.

[0069] The present application hot presses (denoted as second hot pressing) after laying up of the plant fiber felt or the plant fiber prepreg to obtain a plant fiber composite sheet.

[0070] In the present application, the laying up is preferably: overlapping the plant fiber felt or the plant fiber prepreg; the number of layers of the laying up is preferably 1-4 layers, and more preferably 1-2 layers.

[0071] In the present application, the material obtained by laying up is preferably sprayed with a release agent before hot pressing; the release agent is preferably dimethyl silicone oil; the spraying amount of the spraying is preferably 0.06-0.12 kg / m 2 , more preferably 0.08-0.10 kg / m 2 , and further preferably 0.09 kg / m 2 .

[0072] In the present application, the speed of the second hot pressing is preferably 1.5-20 m / min, more preferably 2-10 m / min, and further preferably 5-7 m / min.

[0073] In the present application, the second hot pressing preferably comprises high-pressure hot pressing, medium-pressure hot pressing, and low-pressure hot pressing performed in sequence; the pressure of the high-pressure hot pressing is preferably 4-5 MPa, more preferably 4.2-4.8 MPa, and further preferably 4.4-4.6 MPa; the temperature is preferably 175-275℃, more preferably 195-255℃, and further preferably 215-235℃; the holding time is preferably 2-15 s, more preferably 5-10 s, and further preferably 7-8 s.

[0074] In the present application, the pressure of the medium-pressure hot pressing is preferably 2-3 MPa, more preferably 2.3-2.7 MPa, and further preferably 2.5 MPa, and the temperature is preferably 140-175℃, more preferably 150-165℃, and further preferably 155-160℃, and the holding time is preferably 40-50 s, more preferably 42-48 s, and further preferably 44-46 s.

[0075] In the present application, the pressure of the low-pressure hot pressing is preferably 0.5-1 MPa, more preferably 0.6-0.9 MPa, and further preferably 0.7-0.8 MPa, and the temperature is preferably 100-120℃, more preferably 105-115℃, and further preferably 110℃, and the holding time is preferably not less than 50 s, more preferably 55-80 s, and further preferably 60-70 s.

[0076] In the present application, the second hot pressing is used, the high temperature and high pressure in the high-pressure zone promote the melting of the resin and the better combination with the plant fiber, the temperature is adjusted according to the melting point of the resin, the temperature is slowly reduced from the high-pressure zone, the medium-pressure zone to the low-pressure zone, and the sudden drop in temperature is prevented to cause the too low crystallinity and the too high transparency of the material; the pressure is slowly reduced from the high-pressure zone, the medium-pressure zone to the low-pressure zone, and the size deformation of the material can be avoided.

[0077] In the present application, the equipment of the second hot pressing is preferably a continuous press; the continuous press preferably comprises a high-pressure zone, a medium-pressure zone and a low-pressure zone arranged in sequence; the length of the high-pressure zone is preferably 0.5-5 m, more preferably 1-3 m, and further preferably 1.5-2 m; the length of the medium-pressure zone is preferably 1-16.5 m, more preferably 2-10 m, and further preferably 6 m; the length of the low-pressure zone is preferably 1.25-26.5 m, more preferably 1.5-15 m, and further preferably 5-10 m; and the profile arithmetic mean deviation Ra of the track of the continuous press is preferably 0.05-6.00, more preferably 0.1-4.00, and further preferably 1.00-2.00. The present application controls the surface finish of the plant fiber folder through the track.

[0078] In the present application, the thickness of the plant fiber composite sheet is preferably 0.1-2 mm, more preferably 0.12-1.5 mm, and further preferably 0.2-0.5 mm; the present application does not have requirements for the length and width of the plant fiber composite sheet, and the length and width are preferably determined according to the specifications of the production equipment; in the specific embodiments of the present application, the length of the plant fiber composite sheet is preferably 370-450 mm, more preferably 380-440 mm, and further preferably 390-440 mm, and the width is preferably 260-300 mm, more preferably 270-300 mm, and further preferably 280-300 mm. In the present application, the length and width of the plant fiber composite sheet can theoretically take any value, but are limited by the size of the production equipment, and generally the above size range is used.

[0079] After obtaining the plant fiber composite sheet, the plant fiber composite sheet is cut, and then the long edge of the folded plant fiber composite sheet is edge sealed to obtain a plant fiber folder.

[0080] In the present application, the cutting is preferably mechanical cutting, laser cutting, thermal cutting, ultrasonic cutting or water cutting; and the target shape of the cutting is preferably a rectangle or a rounded rectangle. The present application cuts the plant fiber composite sheet into a target shape.

[0081] In the present application, the folding is preferably equal folding. The present application folds the plant fiber composite sheet to coincide the two short edges.

[0082] In the present application, the edge sealing is preferably hot pressing (denoted as third hot pressing) and cold pressing of the folded long edge in sequence.

[0083] In the present application, the temperature of the third hot pressing is preferably 150-200℃, more preferably 160-180℃, the pressure is preferably 3-5 MPa, more preferably 3.5-4.0 MPa, and the holding time is preferably 60-120 s, more preferably 60-80 s. The present application hot presses the long edge of the plant fiber composite sheet cut into a target shape to seal the long edge and form an L-shaped plant fiber folder.

[0084] In the present application, the time of the cold pressing is preferably 2-4 min, more preferably 3 min, and the pressure is preferably 2-5 MPa, more preferably 3-4 MPa. The present application cold presses the long edge of the plant fiber composite sheet to completely cure the hot-pressed long edge.

[0085] The process flow of the preparation method of the plant fiber folder provided by the present application is shown in Figure 3 The present application hot presses the plant fiber mat or the plant fiber prepreg after laying-up, cuts the obtained plant fiber composite sheet, hot presses the bottom edge, and cold presses to obtain a plant fiber folder.

[0086] In order to further illustrate the present application, the solutions of the present application are described in detail below in conjunction with the accompanying drawings and examples, but they should not be understood as limiting the scope of protection of the present application.

[0087] Example 1

[0088] A continuous bamboo fiber mat (bamboo fiber content 40wt%, polypropylene content 60wt%) with a thickness of 3mm and an area density of 120g / m 2 was sent into a continuous press for hot pressing, the surface of the press belt was smooth, the spraying amount of surface release agent was 0.01kg / m 2 , the running speed of the press was set to 10m / min, the pressure of the high-pressure zone was 5MPa, the temperature was 180℃, and the length was 2.4m; the pressure of the medium-pressure zone was 3MPa, the temperature was 150℃, and the length was 6m; the pressure of the low-pressure zone was 1MPa, the temperature was 120℃, and the length was 7.5m, to obtain a plant fiber composite sheet;

[0089] The obtained plant fiber composite sheet was cut into a rectangular sheet with a length of 440mm and a width of 300mm using a mechanical cutting machine, and a semicircle with a radius of 15mm was cut on the left side of the rectangular sheet, and three semicircles with a radius of 5mm were cut on the upper side; after folding along the long side, the bottom edge was heat-pressed to seal, and then cold-pressed until the bottom edge glue joint completely solidified, to obtain an L-shaped plant fiber file folder;

[0090] The expanded view and front view of the plant fiber file folder prepared in this example are shown in Figure 4 and Figure 5 , and the actual object is shown in Figure 6 and Figure 7 . According to Figures 4-5 , it can be seen that the outer skin of the plant fiber file folder is 440mm long and 302mm wide, the glue joint area is 2mm wide, the center distance of the semicircle on the left side to the nearest top corner is 95mm, the center distance of the three semicircles on the upper side to the nearest top corner is 55mm, 75mm and 95mm respectively, the mark area is 10mm away from the bottom edge and 10mm away from the right side. According to Figures 6-7 , it can be seen that the file folder prepared in this example has a smooth surface, clear plant fiber texture, and is beautiful, fashionable, convenient and durable.

[0091] Example 2

[0092] A continuous plant fiber mat (bamboo fiber content 20wt%, hemp fiber content 20wt%, polypropylene content 60wt%) with a thickness of 4mm and an area density of 180g / m 2 was sent into a continuous press for hot pressing, the surface of the press belt had a diamond pattern, the spraying amount of surface release agent was 0.03kg / m 2, the running speed of the press is set to 8 m / min, the pressure of the high pressure zone is 5 MPa, the temperature is 175℃, and the length is 2 m; the pressure of the medium pressure zone is 2.5 MPa, the temperature is 140℃, and the length is 6.65 m; the pressure of the low pressure zone is 0.5 MPa, the temperature is 115℃, and the length is 8 m, to obtain the plant fiber composite sheet;

[0093] The plant fiber composite sheet obtained is cut into a rectangular sheet with a length of 360 mm and a width of 260 mm by using a laser cutting machine, and a semicircle with a radius of 8 mm is cut on the left side of the rectangular sheet and three semicircles with a radius of 5 mm are cut on the upper side; after folding along the long side, the bottom edge is sealed by hot pressing, and then cold pressing is performed until the bottom edge adhesive is completely cured, to obtain an L-shaped plant fiber folder.

[0094] Example 3

[0095] A continuous plant fiber felt (bamboo fiber content 70wt%, PET content 30wt%) with a thickness of 5 mm and an area density of 200 g / m 2 is sent into a continuous press for hot pressing, the surface of the press belt has a corrugated pattern, the spraying amount of the surface release agent is 0.05 kg / m 2 , the running speed of the press is set to 15 m / min, the pressure of the high pressure zone is 5 MPa, the temperature is 275℃, and the length is 1 m; the pressure of the medium pressure zone is 2 MPa, the temperature is 175℃, and the length is 10 m; the pressure of the low pressure zone is 0 Mpa, the temperature is 100℃, and the length is 16.25 m, to obtain the plant fiber composite sheet;

[0096] The plant fiber composite sheet obtained is cut into a rectangular sheet with a length of 400 mm and a width of 280 mm by using a mechanical cutting machine, and a semicircle with a radius of 12 mm is cut on the left side of the rectangular sheet and three semicircles with a radius of 4 mm are cut on the upper side; after folding along the long side, the bottom edge is sealed by hot pressing, and then cold pressing is performed until the bottom edge adhesive is completely cured, to obtain an L-shaped plant fiber folder.

[0097] Example 4

[0098] A continuous bamboo fiber thermoplastic prepreg (40% Yushania bamboo fiber / 60% polypropylene fiber) with a thickness of 0.6 mm and an area density of 150 g / m 2 is sent into a continuous press for hot pressing, the surface of the press belt is smooth, the spraying amount of the surface release agent is 0.09 kg / m 2 , the running speed of the press is set to 5 m / min, the pressure of the high pressure zone is 3.2 MPa, the temperature is 180℃, and the length is 1.25 m; the pressure of the medium pressure zone is 2 MPa, the temperature is 145℃, and the length is 3.4 m; the pressure of the low pressure zone is 0.5 MPa, the temperature is 100℃, and the length is 6.6 m, to obtain the plant fiber composite sheet;

[0099] The obtained plant fiber composite sheet is cut into a rectangular sheet with a length of 400 mm and a width of 280 mm by using a mechanical cutting machine, and a semicircle with a radius of 9 mm is cut on the left side of the rectangular sheet; after being folded along the long side, the bottom edge is sealed by hot pressing, and then the bottom edge is completely cured by cold pressing, so that an L-shaped plant fiber folder is obtained.

[0100] Example 5

[0101] A continuous bamboo fiber thermoplastic prepreg (60% Bambusa Dicksonii fiber + 25% jute fiber / 15% polylactic acid fiber) with a thickness of 1 mm and an area density of 200 g / m 2 is laid two layers, and is sent into a continuous press for hot pressing; the surface of the press belt is smooth, the spraying amount of the surface release agent is 0.07 kg / m 2 , the running speed of the press is set to 10 m / min, the pressure of the high-pressure area is 4.5 MPa, the temperature is 185℃, and the length is 0.63 m; the pressure of the medium-pressure area is 2.5 MPa, the temperature is 155℃, and the length is 1.7 m; the pressure of the low-pressure area is 1 MPa, the temperature is 120℃, and the length is 3.3 m, so that a plant fiber composite sheet is obtained.

[0102] The obtained plant fiber composite sheet is cut into a rectangular sheet with a length of 440 mm and a width of 270 mm by using a water cutting machine, and a semicircle with a radius of 10 mm is cut on the left side of the rectangular sheet; after being folded along the long side, the bottom edge is sealed by hot pressing, and then the bottom edge is completely cured by cold pressing, so that an L-shaped plant fiber folder is obtained.

[0103] The mechanical properties of the plant fiber folders in Examples 1-5 are detected, and the test standard is referred to QB / T2771-2013, and the results are shown in Table 1.

[0104] Among them, the temperature resistance test is that the page opening and closing is 10 times under the condition of-15-65℃ and relative humidity 50%±5%; the water vapor transmission rate test is carried out at 25℃ and relative humidity 90%.

[0105] Table 1 Performance test results of plant fiber folders in Examples 1-5

[0106]

[0107]

[0108] As shown in Table 1, the plant fiber folder provided by the application has excellent mechanical properties, high strength, good toughness, excellent temperature resistance, good waterproof performance, and is super-thin and easy to use.

[0109] As shown in the above examples, the plant fiber folder provided by the application is environmentally friendly, has excellent mechanical properties, is solid and durable, is beautiful and fashionable, occupies small space, is portable and easy to use, and is green and environmentally friendly.

[0110] Although the above embodiments have been described in detail, they are only some embodiments of the present application, not all embodiments. Other embodiments can be obtained under the premise of not being creative according to the above embodiments, and these embodiments all belong to the protection scope of the present application.

Claims

1. A plant fiber folder, characterized in that: The outer skin is L-shaped and made of plant fiber. The plant fiber raw materials include plant fiber felt and / or plant fiber prepreg; The plant fiber raw materials include plant fibers and thermoplastic yarns; The thermoplastic yarn includes one or both of biodegradable thermoplastic yarn and non-degradable thermoplastic yarn; The plant fiber felt has a thickness of 3-5 mm and a surface density of 50-400 g / m 2 ; The plant fiber prepreg has a thickness of 0.5-1.0 mm and a surface density of 80-200 g / m 2 ; The plant fiber has a fineness of 1-10 tex and a length of 20-80 mm; The thermoplastic filament has a fineness of 0.2 to 9 tex and a length of 40 to 100 mm; The outer skin has a length of 372-450 mm, a width of 260-307 mm, and a thickness of 0.1-2 mm.

2. The plant fiber folder according to claim 1, characterized in that: The plant fibers include one or more of agricultural and forestry production and processing residues and non-recycled fibers; The agricultural and forestry production and processing residues include one or more of rice husks, rice straw, wheat straw, corn stalks, cotton stalks, wood chips and bamboo chips; The non-recycled fibers include one or more of bamboo fibers, hemp fibers, palm fibers, Manila hemp fibers, coconut shell fibers and cotton fibers; The non-degradable thermoplastic yarn includes one or more of polypropylene, polyvinyl chloride and polystyrene; The biodegradable thermoplastic yarn includes one or more of polylactic acid and polyhydroxybutyrate-valerate copolyester.

3. The plant fiber folder according to claim 1, characterized in that: The plant fiber folder is also provided with an arc opening and / or a pen clip; The radius of the arc opening is 10-20 mm.

4. The plant fiber folder according to claim 3, characterized in that: The pen clip is arranged on the top of the outer cover; the shape of the pen clip is arc-shaped; the radius of the pen clip is 4-8 mm; the number of the pen clips is not less than 1.

5. The method for preparing the plant fiber folder according to any one of claims 1 to 4, comprising the following steps: (1) Laying up plant fiber felt or plant fiber prepreg and hot pressing to obtain a plant fiber composite sheet; (2) Cut the plant fiber composite sheet, fold it in half along its long side, and then seal the folded long side to obtain a plant fiber folder.

6. The preparation method according to claim 5, characterized in that The hot pressing includes high pressure hot pressing, medium pressure hot pressing and low pressure hot pressing performed in sequence; The high pressure hot pressing is performed at a pressure of 4-5 MPa, a temperature of 175-275°C, and a time of 2-15 s; The medium pressure hot pressing is performed at a pressure of 2-3 MPa, a temperature of 140-175°C, and a time of 40-50 s; The low-pressure hot pressing has a pressure of 0.5-1 MPa, a temperature of 100-120° C., and a time of not less than 50 seconds.

7. The preparation method according to claim 5 or 6, characterized in that: The speed of the hot pressing is 1.5-20 m / min.

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