Bamboo edge band and continuous preparation method thereof

Abstract

The invention relates to a bamboo edge band and a continuous preparation method thereof, and belongs to the technical field of bamboo processing and furniture manufacturing. The problems that in the prior art, a resin edge band is poor in environmental protection property, and a wood edge band is low in preparation efficiency and prone to deformation and cracking are solved. The bamboo edge banding is obtained through continuous hot pressing of an assembly, and the assembly is composed of a lower-layer dry gum dipping net-shaped fabric and an upper-layer bamboo curtain. In the aspect of environmental protection, the bamboo material serving as a natural renewable resource meets the green and environment-friendly requirements, and is beneficial to guaranteeing the indoor air quality; in the aspect of stability, the impregnated net-shaped fabric in the structure has strength and toughness after being dried, the impregnated net-shaped fabric and the bamboo curtain assembly are mutually cooperated after being subjected to hot pressing, supporting and restraining can be provided for the bamboo curtain, deformation is reduced, and compared with wood edge sealing strips, the bamboo curtain edge sealing strip is higher in structural stability and beneficial to long-term use; and in the aspect of the decorative effect, the texture of the bamboo furniture main body is more coordinated and unified, the overall attractiveness is improved, and higher product value is created.

Description

Technical Field

[0001] The present invention belongs to the technical fields of bamboo processing and furniture manufacturing, and particularly relates to a bamboo edge banding strip and a continuous preparation method thereof. Background Art

[0002] The bamboo edge strip is a roll-shaped thin material used for edge banding the end faces of bamboo panel furniture boards. In furniture use, it can not only play the roles of decoration and beautification, protecting the overall structure of the board, but also prevent the volatilization of harmful gases such as formaldehyde inside the board, playing a certain environmental protection role and ensuring the safety of the indoor environment and human health.

[0003] In the prior art, the commonly used furniture edge banding strips mainly include PVC edge banding strips, ABS edge banding strips, melamine edge banding strips, and wood edge banding strips, etc. The surface can be plain or a surface with color adjustment, printing, and embossed texture.

[0004] The main component of the PVC edge banding strip is polyvinyl chloride, and additives such as plasticizers, stabilizers, lubricants, and dyes can be added. It is made through processes such as mixing, calendering, and vacuum thermoforming, and can be made into edge banding strips with different patterns, designs, and colors. The PVC edge banding strip has a relatively low price and high cost performance. It has good wear resistance, heat resistance, and corrosion resistance. The surface is smooth, and the gloss is moderate. It has various patterns such as wood grain, marble grain, and cloth grain, with strong decoration and good flexibility. It can be bent and can adapt to the edges of furniture with different shapes. However, the quality of PVC edge banding strips varies. Inferior PVC edge banding strips may have problems such as fading, deformation, and delamination. Compared with some other materials of edge banding strips, its durability and environmental protection may be slightly inferior. For example, the research on the preparation of PVC edge banding strips and the attenuation trend of their gloss (Contemporary Chemical Industry, April 2020, Vol. 49, No. 4) pointed out that the gloss of the PVC edge banding strip will attenuate with the increase of storage time (use time). After printing on matte and ordinary gloss edge banding strips, due to the shrinkage of the ink and the substrate itself, there are certain changes and obvious attenuation trends in the surface gloss of the product. The attenuation rate is the largest within 2 days after printing and tends to be stable after 16 days, and the maximum attenuation degree is less than 3Gs.

[0005] The ABS edge banding strip is made of ABS resin and has the advantages of high strength, good toughness, strong impact resistance, good wear resistance, being transparent and smooth after trimming without turning white, good adhesion to the board, and not being easy to delaminate. However, the manufacturing cost is relatively high, and the price is about twice that of the PVC edge banding strip, which has certain limitations in market promotion.

[0006] Melamine edge banding is made of high-quality colored paper, printed with various patterns, and then impregnated and cured with melamine. Melamine edge banding is easy to stick, not easy to stretch or deform when exposed to heat or cold, has good dimensional stability, is relatively cheap, has high cost performance, and has certain fire and moisture resistance. However, it is brittle and easy to break, and is easily damaged during furniture production and transportation.

[0007] Wooden edge banding is made of natural wood and is processed by cutting, grinding, gluing and other processes. It has the texture and grain of natural wood, is beautiful and natural, can be perfectly matched with solid wood furniture, and has good environmental performance and no chemical pollution. However, it can only be pasted by hand in operation, which has low work efficiency. Wood is a hygroscopic material, and its moisture content will be affected by the external environment, which is prone to deformation, cracking and other problems. And because the design and processing implementation are not closely connected, mechanical edge banding cannot be achieved at present. In addition, since the texture of bamboo and wood is quite different, although the materials of the two are close, they are not exactly the same. Therefore, there are still some risks in the effectiveness of the gluing interface when gluing the edge banding. Summary of the invention

[0008] The present invention aims to solve the technical problems in the prior art that resin edge banding strips are poor in environmental protection, wooden edge banding strips have low preparation efficiency, are prone to deformation and cracking, cannot achieve mechanical edge banding, and have a large difference in texture from bamboo. A bamboo edge banding strip and a continuous preparation method thereof are provided.

[0009] The technical solutions adopted by the present invention to achieve the above-mentioned purpose are as follows.

[0010] The bamboo edge banding strip of the invention is obtained by continuous hot pressing of the blank assembly, wherein the blank assembly is composed of a lower layer of dry impregnated mesh fabric and an upper layer of bamboo curtain.

[0011] Preferably, the mesh fabric is made of pure cotton gauze, and the density is controlled between 50 and 70 warp and weft strands per inch.

[0012] Preferably, the glue is formaldehyde-free glue or plant protein glue, with a viscosity of 130-180cp (at 23°C), a pH of 6.0-8.5, and a solid content of 30%-40%;

[0013] More preferably, the formaldehyde-free adhesive is E0 grade melamine-modified urea-formaldehyde resin.

[0014] Preferably, the moisture content of the dried impregnated mesh fabric is 3%-13%.

[0015] Preferably, the bamboo curtain is woven transversely with bamboo silk, and the two ends and the middle are respectively connected with a braiding wire, and the braiding density is controlled at 80-100 strands per 10 cm.

[0016] Preferably, the thickness of the bamboo filaments is 1.5 - 4.5 mm, and more preferably, the thickness of the bamboo filaments is 2 - 3 mm.

[0017] Preferably, for the continuous hot pressing, a continuous hot press is used, with lower layer heating and hot pressing. The temperature of the lower platen is set at 115 - 135 °C, the time is set at 45 - 60 s, and the pressure is set at 2 - 3 MPa.

[0018] The continuous preparation method of the bamboo edge banding strip of the present invention includes the following steps:

[0019] (1) Immerse the mesh fabric in glue, drain the glue, dry it, and roll it into a bundle to obtain a dried impregnated mesh fabric;

[0020] (2) First, cut the bamboo tube to a fixed length transversely, slice it, then plane and cut the obtained bamboo slices, draw wires in layers, and then dry the obtained bamboo filaments, weave them horizontally to obtain a bamboo curtain, and roll it into a bundle;

[0021] (3) Using the dried impregnated mesh fabric as a backing, place the bamboo curtain on the upper surface of the dried impregnated mesh fabric, subject the obtained assembled blank to continuous hot pressing, and after continuous hot pressing, cut and polish to obtain the bamboo edge banding strip.

[0022] Preferably, in step (1), the impregnation speed of the mesh fabric is set at 8 - 10 m / s, and the impregnation amount is controlled at 80% - 100%.

[0023] Preferably, in step (1), the drying method is hot air drying, infrared drying or microwave drying. More preferably, the drying is carried out by hot air drying in a closed drying chamber. The temperature of the drying chamber is controlled at 120 - 140 °C, the drying duration is 25 - 40 s. Particularly preferably, the blowing direction of the hot air drying is perpendicular to the conveying direction of the mesh fabric.

[0024] Preferably, in step (2), before drying the bamboo filaments, one or more of heat bleaching, dyeing, and carbonization color adjustment are carried out;

[0025] More preferably, for the heat bleaching process: immerse the bamboo filaments in a sodium hydroxide solution with a concentration of 1.0 wt% - 2.0 wt% at 25 - 45 °C for 45 - 60 min; Particularly preferably, immerse the bamboo filaments in a sodium hydroxide solution with a concentration of 1.5 wt% at 40 °C for 45 - 60 min;

[0026] More preferably, for the dyeing process: put the bamboo filaments into a caustic soda solution or sodium sulfate solution with a concentration of 1.5 wt% - 2.5 wt% and boil for 3 - 4 min, then take them out and put them into a basic dye and boil for 8 - 12 min; Particularly preferably, for the dyeing process: put the bamboo filaments into a caustic soda solution or sodium sulfate solution with a concentration of 2.0 wt% and boil for 3 - 4 min, then take them out and put them into a basic dye and boil for 10 min;

[0027] More preferably, the carbonization color adjustment includes one or more of light carbon color adjustment, medium carbon color adjustment, and dark carbon color adjustment. The temperature of the light carbon color adjustment is 120°C - 150°C, and the time is 1 - 2h. The temperature of the medium carbon color adjustment is 150°C - 200°C, and the time is 5 - 6h. The temperature of the dark carbon color adjustment is 200°C - 300°C, and the time is 3 - 4h.

[0028] Preferably, in step (3), the cutting and grinding are performed using circular saw blades arranged in multiple parallel paths. The front end of the saw teeth of the circular saw blade is smooth, and the roughness gradually increases from the outside to the inside in the middle and rear ends; more preferably, the range of the roughness is 80 - 180 mesh.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] For the bamboo edge banding strip of the present invention, in terms of environmental protection, bamboo is used for preparation. Compared with resin-based edge banding strips, bamboo, as a natural renewable resource, can reduce the release of harmful chemical substances, meet the requirements of green environmental protection, and is conducive to ensuring indoor air quality.

[0031] For the bamboo edge banding strip of the present invention, in terms of appearance coordination, the bamboo texture is retained, which is closer and more coordinated with the main texture of the bamboo furniture, improving the overall aesthetic degree and creating higher product value.

[0032] For the bamboo edge banding strip of the present invention, in terms of stability, the impregnated mesh fabric in its structure has strength and toughness after drying, and synergizes with the bamboo curtain after hot pressing, can provide support and restraint for the bamboo curtain, reduce deformation and cracking, and has more structural stability than wooden edge banding strips, which is conducive to long-term use.

[0033] The preparation method of the bamboo edge banding strip of the present invention has high efficiency. The continuous processing production process breaks through the current production efficiency; the cutting and grinding have the advantage of integration, and the mechanical edge banding is simple; the prepared product has excellent performance, can avoid deformation and cracking of plastic materials after being heated and illuminated, and has a stable and durable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the following will briefly introduce the drawings required to be used in the specific embodiments. Obviously, the drawings described below are only some specific embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0035] Figure 1 It is a schematic structural diagram of the bamboo edge banding strip of the present invention;

[0036] Figure 2Schematic diagram of the structure of the dried impregnated mesh fabric of the present invention;

[0037] Figure 3 Schematic diagram of the structure of the bamboo curtain of the present invention;

[0038] Figure 4 Process flow chart for preparing the dried impregnated mesh fabric in the present invention;

[0039] Figure 5 Schematic diagram of the blowing direction of hot air drying and the conveying direction of the mesh fabric in the present invention;

[0040] Figure 6 Process flow chart for preparing the bamboo curtain in the present invention;

[0041] Figure 7 Process flow chart for preparing the bamboo edge strip in the present invention;

[0042] Figure 8 is Figure 7 Partial enlarged view of A in;

[0043] Figure 9 is Figure 8 Partial enlarged view of B in;

[0044] Figure 10 Graph showing the change in gloss of the bamboo edge strip of Example 1 of the present invention with the placement time;

[0045] In the figure, 1 is the dried impregnated mesh fabric, 2 is the bamboo curtain, 2-1 is the knitting thread, and 3 is the sawtooth. Detailed implementation mode

[0046] To further understand the present invention, the preferred implementation schemes of the present invention will be described below. However, it should be understood that these descriptions are only for further explaining the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0047] As Figure 1 shown, the bamboo edge strip of the present invention is obtained by continuous hot pressing of the assembled blank, and the assembled blank is composed of the dried impregnated mesh fabric 1 at the lower layer and the bamboo curtain 2 at the upper layer.

[0048] As Figure 2 shown, in the present invention, it is preferred that the mesh fabric is made of pure cotton gauze with a relatively thick yarn count (usually preferably 10 or 12 counts). The pure cotton gauze has a low cost and good moisture absorption and swelling properties, and can fully infiltrate the glue solution into the mesh fabric. To maintain the holding amount of the glue solution, the density of the mesh fabric is preferably controlled between 50 and 70 warp and weft threads per inch. This density will not cause the accumulation of glue solution to increase the cost, nor will it be too sparse to cause insufficient infiltration of the glue solution and lead to the failure of gluing in subsequent processes.

[0049] In the present invention, the glue can be selected from adhesives such as formaldehyde-free glue and plant protein glue. Preferably, E0-grade melamine-modified urea formaldehyde resin with less formaldehyde release and appropriate cost is used for primary dipping. The viscosity of the glue is preferably 130-180 cp (at 23 °C), the pH value is 6.0-8.5, and the solid content is 30%-40%.

[0050] As Figure 3 shown, the bamboo curtain 2 of the present invention is made of bamboo filaments by transverse weaving. One weaving thread 2-1 is used to connect both ends and the middle respectively to ensure the flatness and continuity of the bamboo curtain 2. The weaving density is controlled at 80-100 per 10 cm, which belongs to medium-high density. There is no special limitation on the thickness of the bamboo edge banding strip of the present invention, which can be set according to the furniture style and specifications. The thickness of the edge banding strip mainly depends on the thickness of the bamboo filaments. Preferably, the thickness of the bamboo filaments is 1.5-4.5 mm, and more preferably 2-3 mm.

[0051] In the present invention, continuous hot pressing is carried out by a continuous hot press. One side of the dry dipped mesh fabric 1 is heated and hot pressed unidirectionally. The temperature of the lower pressing plate is set at 115-135 °C, the time is set at 45-60 s, and the pressure is set at 2-3 MPa.

[0052] The continuous preparation method of the bamboo edge banding strip of the present invention includes the following steps:

[0053] As Figure 4 shown, first, the mesh fabric is introduced into the dipping tank for dipping. After dipping, the mesh fabric passes through the glue liquid reflux guide plate to drain the glue. The excess glue liquid is collected into the glue draining reflux collecting tank. After draining the glue, the mesh fabric is dried and then introduced into a roller for winding to obtain the dry dipped mesh fabric 1;

[0054] (2) As Figure 6 shown, first, the bamboo tube is transversely cut to a fixed length and sliced. Then, the obtained bamboo slices are planed, layered and drawn into filaments. Then, the obtained bamboo filaments are dried and transversely woven to obtain the bamboo curtain 2, which is wound into a roll;

[0055] (3) As Figure 7 shown, with the dry dipped mesh fabric 1 as the backing, the bamboo curtain 2 is placed on the dry dipped mesh fabric 1. The obtained assembled blank is continuously hot pressed by a continuous hot press, and then width-fixed sawing is carried out by multiple parallel circular saw blades, and sanding (cutting and grinding) is carried out to obtain the bamboo edge banding strip.

[0056] In the present invention, preferably, the dipping speed is set at 8-10 m / s, and the dipping amount is controlled at 80%-100%.

[0057] In the present invention, the drying method is hot air drying, infrared drying or microwave drying, which can be selected according to actual needs. Among them, infrared drying uses infrared radiation to quickly evaporate the moisture in the glue, featuring fast drying speed and high energy utilization rate; microwave drying utilizes microwaves to cause the water molecules in the glue to vibrate and generate heat through friction, thereby achieving the purpose of drying, with the advantages of uniform drying and little impact on the internal structure of the glue, but the equipment cost is relatively high. To control the equipment cost, hot air drying is preferably adopted, carried out in a closed drying chamber. The temperature of the closed drying chamber is controlled at 120 - 140 °C, and the drying duration is 25 - 40 s. The drying process can be completed by adjusting the conveying speed according to the actual situation. The blowing direction of the hot air drying is perpendicular to the conveying direction of the mesh fabric, as Figure 5 shown. At the end of the drying process, the moisture content of the dried impregnated mesh fabric 1 remains within the range of 3% - 13%.

[0058] In step (2) of the present invention, after wire drawing, in order to ensure the durability or visual effect of the product, it is preferably also subjected to one or more of heat bleaching, dyeing, and carbonization color adjustment.

[0059] Among them, heat bleaching can bleach the bamboo filaments into bamboo products of different degrees of natural bamboo color. The preferred process is: impregnate the bamboo filaments in a sodium hydroxide solution with a concentration of 1.0 wt% - 2.0 wt% at 25 - 45 °C for 45 - 60 min; more preferably, impregnate them in a sodium hydroxide solution with a concentration of 1.5 wt% at 40 °C; the soaking duration can be appropriately adjusted according to the specifications of the bamboo filaments, and the duration increases with the increase in the length and width of the bamboo filaments; after heat bleaching, lift them out and drain, rinse the bleached bamboo filaments with clean water and then drain and air-dry them indoors or outdoors. Note that when drying or air-drying them centrally, they should be arranged as scattered as possible to avoid damp deterioration caused by over-concentration.

[0060] The process of dyeing: Put the bamboo filaments into a caustic soda solution or sodium sulfate solution with a concentration of 1.5 wt% - 2.5 wt% and boil for 3 - 4 min, then take them out and put them into a basic dye and boil for 8 - 12 min to obtain the desired color. It is preferably to put them into a caustic soda solution or sodium sulfate solution with a concentration of 2.0 wt% and boil for 3 - 4 min, then take them out and put them into a basic dye and boil for 10 min.

[0061] Carbonization color adjustment includes one or more of light carbon color adjustment, medium carbon color adjustment, and dark carbon color adjustment, and physical color adjustment can be performed according to color requirements. Light carbon color adjustment makes the color of bamboo filaments transition from light yellow to light brown, and the temperature range is set at 120°C - 150°C. Heat treatment can be carried out for 1 - 2 hours according to color requirements; medium carbon color adjustment makes the bamboo filaments gradually turn brown or dark brown, and the temperature range is set at 150°C - 200°C. Heat treatment can be carried out for 5 - 6 hours according to color requirements; dark carbon color adjustment makes the color of bamboo filaments gradually turn into dark brown, and the temperature range is set at 200°C - 300°C. Heat treatment can be carried out for 3 - 4 hours according to color requirements. The whole process is carried out in a carbonization tank, and saturated steam is used as a protective gas.

[0062] As Figure 8 - 9 shown, in step (3) of the present invention, width - fixing sawing adjusts the saw - path width according to actual requirements. In order to avoid fiber cracking at the ends of bamboo filaments during sawing, the present invention uses circular saw blades arranged in multiple parallel paths. The saw teeth 3 at the front end of the circular saw blade are sharp and smooth, and the roughness gradually increases from the outside to the inside in the middle and rear ends. The roughness range is 80 - 180 mesh, mainly to gradually polish the ends of bamboo filaments while sawing through the long bamboo curtain.

[0063] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with embodiments.

[0064] The following embodiments are used to illustrate the present invention, but do not limit the scope of the present invention. Unless otherwise specified, the technical means used in the embodiments are conventional means well - known to those skilled in the art.

[0065] Embodiment 1

[0066] The bamboo edge - banding strip is obtained by continuous hot - pressing of a formed laminate. The formed laminate consists of a lower - layer dry impregnated mesh fabric 1 and an upper - layer bamboo curtain 2;

[0067] Among them, the mesh fabric uses pure - cotton gauze, and the density of the warp and weft per inch is controlled to be between 50 - 70 roots; the glue is E0 - grade melamine - modified urea - formaldehyde resin, with a viscosity of 130 - 180 cp, a PH of 6.0 - 8.5, and a solid content of 30% - 40%; the moisture content of the dry impregnated mesh fabric is 3% - 13%;

[0068] The bamboo curtain 2 is woven horizontally from bamboo filaments, and is connected at both ends and in the middle with a knitting thread 2 - 1 respectively. The knitting density is controlled to be 80 - 100 roots per 10 cm, and the thickness of the bamboo filaments is 1.5 - 4.5 mm;

[0069] Continuous hot - pressing uses a continuous hot - press. The lower layer is heated and hot - pressed. The temperature of the lower pressing plate is set at 115 - 135°C, the time is set at 45 - 60 s, and the pressure is set at 2 - 3 MPa.

[0070] The continuous preparation method of the above bamboo edge banding strip includes the following steps:

[0071] (1) Immerse the net fabric in glue, drain the glue, dry it, and roll it up to obtain the dried impregnated net fabric 1; the impregnation speed of the net fabric is set at 8 - 10 m / s, and the impregnation amount is controlled at 80% - 100%.

[0072] (2) First, cut the bamboo tube to a fixed length transversely, slice it, then plane and cut the obtained bamboo slices, draw them into layers, and then hot - air dry the obtained bamboo filaments and weave them horizontally to obtain the bamboo curtain 2, and roll it up; the hot - air drying is carried out in a closed drying chamber, the temperature of the drying chamber is controlled at 120 - 140 °C, the drying duration is controlled at 25 - 40 s, and the blowing direction of the hot - air drying is perpendicular to the conveying direction of the net fabric.

[0073] (3) Using the dried impregnated net fabric 1 as the backing, place the bamboo curtain 2 on the upper surface of the dried impregnated net fabric, and perform continuous hot - pressing on the obtained assembled blank. After continuous hot - pressing, use circular saw blades arranged in multiple parallel paths for cutting and grinding. The front end of the saw teeth 3 of the circular saw blade is smooth, and the roughness gradually increases from the outside to the inside in the middle and rear ends, and the roughness range is 80 - 180 mesh to obtain the bamboo edge banding strip.

[0074] Perform dimensional stability detection on the bamboo edge banding strip obtained in Example 1 to investigate whether the bamboo edge banding strip deforms, twists, etc. in the storage environment. The detection method is as follows: First, place the bamboo edge banding strip in a constant - temperature and constant - humidity box at a temperature of 40 °C and a relative humidity of 90% (simulating a high - humidity environment) for 24 h, and then place it in an environment with a temperature of 20 °C ± 2 °C and a relative humidity of 65% ± 5%. After it stabilizes, observe and identify its appearance. Take 10 samples for detection respectively, and the detection results are shown in Table 1.

[0075] Table 1 Measurement table of the initial length and the length after moisture absorption of the bamboo edge banding strip

[0076] Serial number Initial length (cm) Moisture absorption length (cm) Difference (cm) Change rate (%) 1 2.078 2.157 0.079 3.801732435 2 2.058 2.119 0.061 2.96404276 3 2.074 2.15 0.076 3.664416586 4 2.068 2.144 0.076 3.675048356 5 2.070 2.21 0.14 6.763285024 6 2.075 2.189 0.114 5.493975904 7 2.079 2.139 0.06 2.886002886 8 2.08 2.19 0.11 5.288461538 9 2.063 2.159 0.096 4.653417353 10 2.078 2.149 0.071 3.416746872

[0077] As can be seen from Table 1, under the action of different temperature and humidity environments, the bamboo edge banding strip still maintains its original shape characteristics, and no obvious deformation, twisting, etc. occur. Through calculation, it can be known that the change range of the length of the bamboo edge banding strip is extremely small, and the width and thickness ranges hardly change, meeting the requirements of the relevant quality standards for the cross - section shape stability.

[0078] For the stability test of the bamboo edge banding obtained in Example 1, investigate whether the bamboo edge banding shows deformation, distortion, etc. in the storage environment. The test method is as follows: Store the bamboo edge banding at room temperature of 20 ± 2 °C and humidity of 65 ± 5% for 36 days (the same as the glossiness test conditions of the PVC edge banding in the research on the preparation of PVC edge banding and its glossiness attenuation trend), and observe the change in its glossiness. The test results are as Figure 10 shown. From Figure 10 it can be seen that the glossiness of the bamboo edge banding does not change significantly with the increase of time. Compared with the PVC edge banding, the glossiness of the bamboo edge banding is more stable under the same conditions.

[0079] The above tests show that the bamboo edge banding has good dimensional stability, wide material sources, convenient production and manufacturing, can meet the relevant requirements of the surface covering materials for bamboo and wood furniture, adds a unique natural charm and high-quality decorative effect to furniture products, and is worthy of wide application in the furniture manufacturing industry.

[0080] Obviously, the above embodiments are only examples given for clear illustration and not limitations on the embodiments. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. And the obvious changes or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A bamboo edge banding strip, characterized in that, It is obtained by continuous hot pressing of the laminated blank, and the laminated blank is composed of a dried impregnated mesh fabric in the lower layer and a bamboo curtain in the upper layer.

2. The bamboo edge banding strip according to claim 1, wherein, The mesh fabric is made of pure cotton gauze, and the sum of warp and weft per inch is controlled between 50 and 70 threads. The glue is formaldehyde-free glue or plant protein glue, with a viscosity of 130 - 180 cp, a PH value of 6.0 - 8.5, and a solid content of 30% - 40%. The moisture content of the dried impregnated mesh fabric is 3% - 13%.

3. The bamboo edge banding strip according to claim 2, characterized in that, The formaldehyde-free glue is E0 grade melamine modified urea formaldehyde resin.

4. The bamboo edge banding strip according to claim 1, characterized in that The bamboo curtain is woven horizontally by bamboo filaments, and both ends and the middle are respectively connected by a braided thread. The weaving density is controlled at 80 - 100 threads per 10 cm, and the thickness of the bamboo filaments is 1.5 - 4.5 mm.

5. The bamboo edge banding strip according to claim 1, wherein, The continuous hot pressing uses a continuous hot press, with the lower layer heated and hot pressed. The temperature of the lower platen is set at 115 - 135 °C, the time is set at 45 - 60 s, and the pressure is set at 2 - 3 MPa.

6. The continuous preparation method of the bamboo edge banding strip according to any one of claims 1-5, characterized in that, It includes the following steps: (1) Immerse the mesh fabric in glue, drain the glue, dry it, and roll it up to obtain a dried impregnated mesh fabric. (2) First, cut the bamboo tube to a fixed length transversely, split it, then plane and cut the obtained bamboo slices, layer and draw them into filaments, and then dry and horizontally weave the obtained bamboo filaments to obtain a bamboo curtain, and roll it up. (3) Using the dried impregnated mesh fabric as a backing, place the bamboo curtain on the upper surface of the dried impregnated mesh fabric, and continuously hot press the obtained laminated blank. After continuous hot pressing, cut and polish it to obtain a bamboo edge strip.

7. The continuous preparation method of the bamboo edge banding strip according to claim 6, characterized in that, In step (1), the impregnation speed of the mesh fabric is set at 8 - 10 m / s, and the impregnation amount is controlled at 80% - 100%.

8. The continuous preparation method of the bamboo edge banding strip according to claim 6, characterized in that, In step (1), the drying method is hot air drying, infrared drying or microwave drying. The hot air drying is carried out in a closed drying chamber, the temperature of the drying chamber is controlled at 120 - 140 °C, the drying duration is controlled at 25 - 40 s, and the blowing direction of the hot air drying is perpendicular to the conveying direction of the mesh fabric.

9. The continuous preparation method of the bamboo edge banding strip according to claim 6, characterized in that, In step (2), before drying the bamboo filaments, one or more of heat bleaching, dyeing, and carbonization and color adjustment are carried out. The process of heat bleaching: Immerse the bamboo filaments in a sodium hydroxide solution with a concentration of 1.0 wt% - 2.0 wt% at 25 - 45 °C for 45 - 60 min. The process of dyeing: Put the bamboo filaments into a caustic soda solution or sodium sulfate solution with a concentration of 1.5 wt% - 2.5 wt% and boil for 3 - 4 min, then take them out and put them into an alkaline dye and boil for 8 - 12 min. The carbonization and color adjustment includes one or more of light carbon color adjustment, medium carbon color adjustment, and deep carbon color adjustment. The temperature of the light carbon color adjustment is 120 °C - 150 °C, the time is 1 - 2 h, the temperature of the medium carbon color adjustment is 150 °C - 200 °C, the time is 5 - 6 h, and the temperature of the deep carbon color adjustment is 200 °C - 300 °C, the time is 3 - 4 h.

10. The continuous preparation method of the bamboo edge banding strip according to claim 6, characterized in that, In step (3), the cutting and polishing use circular saw blades arranged in multiple parallel paths. The front end of the saw teeth of the circular saw blade is smooth, and the roughness gradually increases from the outside to the inside in the middle and the rear end, and the range of the roughness is 80 - 180 meshes.

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