Cvc flame-retardant composite fabric and preparation method thereof

Abstract

The application discloses a CVC flame-retardant composite fabric and a preparation method thereof, and relates to the field of CVC flame-retardant fabrics. The composite fabric comprises a CVC fabric layer, a reinforcing layer, a flame-retardant layer and a protective layer; the reinforcing layer is arranged between the CVC fabric layers, and the flame-retardant layer and the protective layer are sequentially arranged on the outer side of the CVC fabric layer; and the reinforcing layer is a net-shaped structure composed of flame-retardant threads. The preparation method of the CVC flame-retardant composite fabric comprises the following steps: stacking the CVC fabric layer, the reinforcing layer and the CVC fabric layer in a pressing device for pressing, coating the flame-retardant liquid through a flame-retardant coating device and then drying; and then, entering a glue spraying and curing device to spray protective glue and directly curing. The application has the advantages that the reinforcing layer is arranged as an interlayer, the flame-retardant layer is further formed on the surface of the composite fabric, the flame-retardant effect is better, and the strength is higher; the flame-retardant liquid can be prevented from precipitating during flame-retardant coating, and the flame-retardant effect is better after coating; the composite fabric is spirally conveyed in the glue spraying and drying box, hot air is blown around, the curing efficiency is higher, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to CVC flame-retardant fabric, in particular to a CVC flame-retardant composite fabric and a preparation method thereof. BACKGROUND

[0002] The CVC flame-retardant fabric is a flame-retardant fabric made by treating the CVC fabric with a flame-retardant process. The CVC flame-retardant fabric is a flame-retardant polyester-cotton fabric. Due to the polyester content, the fabric has good wear resistance and wrinkle resistance. Due to the high cotton content, the fabric has a soft hand feeling and does not irritate the skin. The CVC flame-retardant fabric is widely used in mechanical, electric welding, mining, chemical and other fields, and can be used to make flame-retardant work clothes and mechanical cloth.

[0003] When the CVC flame-retardant fabric is applied in the fields of machinery, electric welding, etc., it needs to have good strength. In the prior art, the CVC flame-retardant fabric is usually a single-layer structure, and the tensile strength of the CVC flame-retardant fabric is low. In addition, during the flame-retardant treatment of the conventional CVC flame-retardant fabric, the flame-retardant liquid is not evenly distributed, and the flame-retardant effect is weakened after coating. In addition, when the protective layer on the outside of the flame-retardant layer is glued, it is usually horizontally conveyed, and then horizontally conveyed or inclinedly conveyed during solidification. The inclined conveying can save the land occupation area of the equipment compared with the horizontal conveying, but the inclined conveying still needs a large-volume solidification equipment, and the land occupation area is still large. The gluing and solidification need a long production line, which is low in efficiency and wastes a lot of energy. Therefore, it is necessary to provide a CVC flame-retardant composite fabric and a preparation method thereof, so that the CVC flame-retardant fabric has flame-retardant performance and high strength, and the processing efficiency of the protective layer is improved. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a CVC flame-retardant composite fabric and a preparation method thereof, which can solve the problems of low tensile strength of the CVC flame-retardant fabric in the prior art, uneven distribution of the flame-retardant liquid during the flame-retardant treatment of the CVC flame-retardant fabric, weakening of the flame-retardant effect after coating, horizontal conveying or inclined conveying of the protective layer during the gluing and solidification of the protective layer, large solidification equipment space, large land occupation area, long production line for gluing and solidification, low efficiency and energy waste.

[0005] To solve the above technical problems, the technical scheme of the present application is as follows: a CVC flame-retardant composite fabric, comprising a CVC fabric layer, a reinforcing layer, a flame-retardant layer and a protective layer; the reinforcing layer is arranged between two CVC fabric layers, and the outer side of the CVC fabric layer is sequentially provided with the flame-retardant layer and the protective layer; the reinforcing layer is a net structure composed of flame-retardant threads, and the flame-retardant threads are composed of nylon fiber threads and glass fiber threads.

[0006] A preparation method of a CVC flame-retardant composite fabric, comprising the following steps:

[0007] S1, a reinforcing layer is arranged between the two layers of CVC fabric layers as a sandwich layer, the CVC fabric layers, the reinforcing layer and the CVC fabric layers are sequentially stacked into a pressing device to press and form a composite fabric;

[0008] S2, the composite fabric formed by pressing enters a flame-retardant coating device, the flame-retardant liquid prepared in advance is coated on the surface of the composite fabric formed by pressing to form a flame-retardant coating layer, the two sides of the composite fabric are simultaneously coated with the flame-retardant coating layer, and after the coating is completed, drying is performed;

[0009] S3, the dried composite fabric enters a gluing and curing device, the protective glue prepared in advance is sprayed on the composite fabric by the gluing and curing device to perform gluing, and after the gluing is completed, direct curing is performed, finally, the prepared CVC flame-retardant composite fabric is wound and packaged;

[0010] When the CVC flame-retardant composite fabric is prepared according to the above steps S1-S3, the pressing device, the flame-retardant coating device and the gluing and curing device involved in the preparation are provided, the flame-retardant coating device is arranged at the discharge end of the pressing device, and the gluing and curing device is arranged at the discharge end of the flame-retardant coating device;

[0011] The pressing device comprises a pressing box, a hot pressing roller group is installed in the pressing box, the hot pressing roller group comprises a first hot pressing roller and a second hot pressing roller, the first hot pressing roller and the second hot pressing roller are rotatably installed in the pressing box through mounting shafts, the first hot pressing roller and the second hot pressing roller are arranged side by side, and the top and bottom of the pressing box are respectively provided with hot air outlets;

[0012] The flame-retardant coating device comprises a flame-retardant coating box, an upper coating roller and a lower coating roller are arranged in the flame-retardant coating box, the composite fabric passes between the upper coating roller and the lower coating roller, and the upper coating roller and the lower coating roller simultaneously coat the upper surface and the lower surface of the composite fabric with the flame-retardant liquid;

[0013] The upper coating roller and the lower coating roller are respectively in contact with the upper and lower liquid distribution rollers, the two liquid distribution rollers are respectively installed through drive shafts, corresponding liquid storage tanks are respectively arranged below the two liquid distribution rollers, the two liquid storage tanks are respectively installed and fixed, a stirring mechanism is arranged in the liquid storage tank, the stirring mechanism stirs the flame-retardant liquid in the liquid storage tank to prevent precipitation, and simultaneously scrapes off residual liquid from the liquid distribution roller;

[0014] The gluing and curing device comprises a gluing and drying box body, the gluing and drying box body is a hollow cylindrical structure, the axial direction of the gluing and drying box body is perpendicular to the conveying direction of the composite fabric in the flame-retardant coating box, a fixed shaft is arranged in the center of the interior of the gluing and drying box body, a plurality of guide rollers are arranged on the outer periphery of the fixed shaft, a distance is left between the guide rollers and the inner wall of the gluing and drying box body, and the composite fabric is wound outside the plurality of guide rollers to realize spiral conveying;

[0015] The upper gluing drying box body is provided with a glue storage groove at the top of the input end, and the bottom of the glue storage groove is provided with a glue spraying head.

[0016] The upper gluing drying box body is provided with a glue storage groove at the top of the input end, and the bottom of the glue storage groove is provided with a glue spraying head.

[0017] Further, the heat air inlets at the top and bottom of the pressing box are respectively provided with filter screens.

[0018] Further, the cross section of the liquid storage tank is a U-shaped structure, and the stirring mechanism in the liquid storage tank includes a stirring shaft, which is transversely installed in the liquid storage tank. The stirring shaft is uniformly provided with connecting rods and stirring rollers at the outer periphery. The stirring rollers are arranged at the end of the connecting rods away from the stirring shaft. The stirring shaft drives the stirring rollers to rotate to stir the fire-retardant liquid. The stirring rollers, the stirring shaft and the liquid uniformizing rollers are arranged in the axial direction. The track line of the stirring roller corresponds to the U-shaped bottom of the liquid storage tank. The stirring roller can stir the fire-retardant liquid at the bottom of the liquid storage tank. When the stirring roller rotates to the highest position, it contacts the lowermost part of the liquid uniformizing roller to scrape off the residual liquid on the liquid uniformizing roller.

[0019] Further, the upper coating roller and the lower coating roller are respectively installed on two rotating shafts. One of the rotating shafts is driven to rotate by the first driving motor. The two rotating shafts are respectively provided with intermeshing gears. The other rotating shaft is driven to rotate by the gears.

[0020] The two driving shafts on which the two liquid uniformizing rollers are installed are respectively provided with intermeshing gears. One of the driving shafts is driven to rotate by the second driving motor to drive the other driving shaft to rotate. The two driving shafts drive the two liquid uniformizing rollers to rotate simultaneously.

[0021] The stirring shaft and the driving shaft on which the liquid uniformizing roller is installed are connected by gears. The second driving motor drives the driving shaft to rotate while driving the stirring shaft to rotate.

[0022] Further, a fixed rod is arranged above the inner wall of the liquid storage tank. The end of the fixed rod away from the inner wall of the liquid storage tank is connected with a liquid uniformizing plate. The liquid uniformizing plate extends along the axial direction of the liquid uniformizing roller.

[0023] Of the two liquid storage tanks, the lower liquid storage tank is fixedly installed at the inner bottom of the fire-retardant coating box, and the upper liquid storage tank is fixedly installed at the inner top of the fire-retardant coating box by the mounting frame.

[0024] Further, the fixed shaft in the inside of the gluing drying box is supported and fixed by the support frame, the two ends of the fixed shaft protrude from the outside of the gluing drying box, the outer periphery of the fixed shaft is connected with the support shaft through the support rod, the guide roller is rotatably arranged on the support shaft, the axial direction of the guide roller is the same as that of the fixed shaft, a plurality of guide rollers are uniformly distributed on the outer periphery of the fixed shaft to form a ring, and the two ends of the guide roller are arranged at the two ends of the gluing drying box outside, so that the input and output of the composite fabric are facilitated, and the composite fabric enters the gluing drying box from the position of the lower guide roller.

[0025] The several air inlets are uniformly distributed on the outer periphery of the gluing drying box, and the hot air discharged from the air inlet pipeline enters the gluing drying box through the several air inlets to perform the glue curing of the surrounding composite fabric.

[0026] The advantage of the present application is that a reinforcing layer is arranged as a sandwich layer between the two layers of CVC fabric, and the reinforcing layer is a net structure composed of flame-retardant threads, which can help the CVC flame-retardant composite fabric to have good tensile strength, the use of nylon fiber threads and glass fiber threads makes the reinforcing layer have good flame-retardant effect, the mesh holes on the reinforcing layer increase the heat insulation effect of the CVC flame-retardant composite fabric, and the composite fabric is coated with a flame-retardant coating by the flame-retardant coating device, so that a flame-retardant layer is formed on the surface of the composite fabric, the flame-retardant effect of the composite fabric is better, and the safety performance is higher.

[0027] During the flame-retardant coating, the stirring mechanism is arranged in the liquid storage tank, the stirring shaft of the stirring mechanism is driven to rotate by the liquid uniformizing roller through the action of the gear, and both are driven by the second driving motor, so that the structure is compact and the energy consumption is low. The flame-retardant liquid in the liquid storage tank is stirred by the stirring roller connected to the stirring shaft, so that the flame-retardant liquid is prevented from precipitating, and the rotation track of the stirring roller is consistent with the structure of the bottom of the liquid storage tank, so that the flame-retardant liquid in the dead angle at the bottom of the liquid storage tank is prevented from precipitating. At the same time, when the stirring roller rotates to the highest position and contacts the lowermost part of the liquid uniformizing roller, the residual liquid on the liquid uniformizing roller can be scraped off, so that the flame-retardant liquid accumulated on the liquid uniformizing roller is prevented. After the liquid uniformizing roller carries the flame-retardant liquid, the flame-retardant liquid is scraped evenly by the liquid uniformizing plate, the transferred flame-retardant liquid is more evenly distributed, and the flame-retardant effect after coating is better.

[0028] The flame-retardant liquid coated composite fabric enters the gluing and curing device for gluing and curing of the protective layer. During gluing, the glue is sprayed through a glue spraying head and then evenly coated by a glue coating brush. After gluing, the glue is cured and dried by hot air input through the air inlets at the middle position and the output end of the gluing and drying box. The gluing and drying box is a hollow cylindrical structure. The composite fabric is wound outside the guide rollers arranged in the gluing and drying box to realize spiral conveying. During curing and drying, the hot air blows around the composite fabric. The curing and drying efficiency is higher, and energy is saved. Gluing and curing are both completed in the gluing and drying box. The volume of the gluing and drying box does not need to be very large, the production line occupies less area, and the cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the CVC flame-retardant composite fabric of the present application.

[0030] Figure 2 It is a structural schematic diagram of the pressing device, the flame-retardant coating device, and the gluing and curing device system for preparing the CVC flame-retardant composite fabric of the present application.

[0031] Figure 3 It is a front view of the liquid uniformizing roller and the liquid storage tank in the flame-retardant coating device of the present application.

[0032] Figure 4 It is a side view of the liquid uniformizing roller and the liquid storage tank in the flame-retardant coating device of the present application.

[0033] Figure 5 It is a side view of the gluing and curing device of the present application. EMBODIMENT

[0034] In order to make the purpose, technical scheme and advantages of the present application clearer and more apparent, the present application will be further described in detail below in combination with the drawings and specific embodiments. The following embodiments can enable those skilled in the art to more fully understand the present application, but the present application is not limited in the scope of the described embodiments.

[0035] The specific embodiment adopts the following technical scheme: a CVC flame-retardant composite fabric, comprising a CVC fabric layer 10, a reinforcing layer 20, a flame-retardant layer 30, and a protective layer 40; the reinforcing layer 20 is arranged between the two CVC fabric layers 10, and the outer side of the CVC fabric layer 10 is sequentially provided with the flame-retardant layer 30 and the protective layer 40; the reinforcing layer 20 is a net structure composed of flame-retardant threads, and the flame-retardant threads are composed of nylon fiber threads and glass fiber threads.

[0036] A preparation method of a CVC flame-retardant composite fabric comprises the following steps:

[0037] S1, a reinforcing layer 20 is arranged between the two layers of CVC fabric layers 10 as a sandwich layer, and the CVC fabric layer 10, the reinforcing layer 20 and the CVC fabric layer 10 are sequentially stacked into the pressing device 1 to press and form a composite fabric.

[0038] S2, the composite fabric formed by pressing enters the flame-retardant coating device 2, the flame-retardant liquid prepared in advance is coated on the surface of the composite fabric formed by pressing to form a flame-retardant coating layer 30, and the coating of the flame-retardant coating layer 30 is simultaneously performed on both sides of the composite fabric, and after the coating is completed, the composite fabric is dried by the drying device 3.

[0039] S3, the dried composite fabric enters the gluing and curing device 4, the protective glue prepared in advance is sprayed on the composite fabric by the gluing and curing device 4 to perform gluing, form a protective layer 40, and directly cure after the gluing is completed, finally, the CVC flame-retardant composite fabric prepared is wound and packaged, and the structure of the CVC flame-retardant composite fabric is as shown in Figure 1

[0040] A reinforcing layer 20 is arranged between the two layers of CVC fabric layers 10 as a sandwich layer, and the reinforcing layer 20 is a net structure composed of flame-retardant lines, which can help the CVC flame-retardant composite fabric to have good tensile strength. By using nylon fiber lines and glass fiber lines, the reinforcing layer has good flame-retardant effect, and by using the mesh holes on the reinforcing layer, the heat insulation effect of the CVC flame-retardant composite fabric is increased. The composite fabric is coated with a flame-retardant coating layer by the flame-retardant coating device 2, and a flame-retardant layer 30 is formed on the surface of the composite fabric. The composite fabric has better flame-retardant effect and higher safety performance.

[0041] The process of preparing the CVC flame-retardant composite fabric according to the above steps S1-S3 involves the pressing device 1, the flame-retardant coating device 2 and the gluing and curing device 4. The flame-retardant coating device 2 is arranged at the discharge end of the pressing device 1, and the gluing and curing device 4 is arranged at the discharge end of the flame-retardant coating device 2. The drying device 3 is arranged after the flame-retardant coating device 2, and the drying device 3 is arranged between the flame-retardant coating device 2 and the gluing and curing device 4 to dry the flame-retardant liquid coated on the surface of the composite fabric.

[0042] As shown in Figure 2 The pressing device 1 includes a pressing box 11, a hot pressing roller group is installed in the pressing box 11, the hot pressing roller group includes a first hot pressing roller 12 and a second hot pressing roller 13, the first hot pressing roller 12 and the second hot pressing roller 13 are rotatably installed in the pressing box 11 through mounting shafts, the first hot pressing roller 12 and the second hot pressing roller 13 are arranged side by side, the top and the bottom of the pressing box 11 are respectively provided with hot air outlets 14, and filter screens are respectively arranged at the hot air outlets 14. When hot air enters the inside of the pressing box 11 from the hot air outlets 14, no impurities such as particles and dust enter the inside of the pressing box 11, so that the pressing quality of the composite fabric is ensured. ​

[0043] The fire-retardant coating device 2 comprises a fire-retardant coating box 21, in which an upper coating roller 22 and a lower coating roller 23 are arranged, and the composite fabric passes between the upper coating roller 22 and the lower coating roller 23, and the upper coating roller 22 and the lower coating roller 23 simultaneously coat the upper surface and the lower surface of the composite fabric with fire-retardant liquid.

[0044] The upper coating roller 22 and the lower coating roller 23 are respectively installed on two rotating shafts, one of which is driven to rotate by a first driving motor, not shown in the figure, and the two rotating shafts are respectively sleeved with intermeshing gears, and the other rotating shaft is driven to rotate by the gears.

[0045] The upper coating roller 22 and the lower coating roller 23 are respectively in contact with the liquid uniformizing rollers 24 arranged above and below, as shown in Figure 3 and Figure 4 The liquid uniformizing rollers 24 are respectively installed through driving shafts 25, and below the two liquid uniformizing rollers 24, corresponding storage tanks 26 are respectively arranged, the two storage tanks 26 are respectively installed and fixed, the storage tanks 26 are respectively provided with stirring mechanisms, the stirring mechanisms stir the fire-retardant liquid in the storage tanks 26 to prevent precipitation, and at the same time, the stirring mechanisms scrape off residual liquid on the liquid uniformizing rollers 24.

[0046] The cross section of the storage tank 26 is in a U-shaped structure, and the stirring mechanism in the storage tank 26 comprises a stirring shaft 27, which is transversely installed in the storage tank 26, and the outer periphery of the stirring shaft 27 is uniformly provided with connecting rods 28 and stirring rollers 29, the stirring rollers 29 are arranged at one end of the connecting rods 28 away from the stirring shaft 27, the stirring shaft 27 drives the stirring rollers 29 to rotate to stir the fire-retardant liquid, the stirring rollers 29, the stirring shaft 27 and the liquid uniformizing rollers 24 are arranged in parallel with the axial direction, the trace line of the rotation of the stirring rollers 29 corresponds to the U-shaped bottom of the storage tank 26, the stirring rollers 29 can stir the fire-retardant liquid at the bottom of the storage tank 26, and when the stirring rollers 29 rotate to the highest position, the stirring rollers 29 are in contact with the lowermost part of the liquid uniformizing rollers 24 to scrape off the residual liquid on the liquid uniformizing rollers 24.

[0047] Intermeshing gears are respectively sleeved on the two driving shafts 25 on which the two liquid uniformizing rollers 24 are installed, one driving shaft 25 is driven to rotate by a second driving motor to drive the other driving shaft 25 to rotate, the two driving shafts 25 respectively drive the two liquid uniformizing rollers 24 to rotate simultaneously, the stirring shaft 27 is connected with the driving shafts 25 on which the liquid uniformizing rollers 24 are installed through gears, the two gears are respectively arranged in meshing relationship with a third gear, and the second driving motor drives the driving shafts 25 to rotate at the same time to drive the stirring shaft 27 to rotate.

[0048] A fixed rod 210 is arranged above the inner wall of the storage tank 26, one end of the fixed rod 210 away from the inner wall of the storage tank 26 is connected with a liquid uniformizing plate, the liquid uniformizing plate extends along the axial direction of the liquid uniformizing roller 24, and the liquid uniformizing plate can scrape the fire-retardant liquid adhered on the liquid uniformizing roller 24.

[0049] Two liquid storage tanks 26, the lower liquid storage tank 26 is fixedly installed on the inner bottom of the fire-retardant coating box 21, and the upper liquid storage tank 26 is fixedly installed on the inner top of the fire-retardant coating box 21 through a mounting frame.

[0050] During fire-retardant coating, a stirring mechanism is arranged in the liquid storage tank 26, the stirring shaft 27 of the stirring mechanism is driven to rotate by the liquid homogenizing roller 24 through the action of a gear, and the stirring mechanism and the liquid homogenizing roller 24 are both driven by the second driving motor, so that the structure is compact and the energy consumption is low. The fire-retardant liquid in the liquid storage tank 26 is stirred by the stirring roller 29 connected to the stirring shaft 27 to prevent the fire-retardant liquid from precipitating, and the rotation track of the stirring roller 29 is consistent with the structure of the bottom of the liquid storage tank 26 to prevent the fire-retardant liquid from precipitating in the dead angle of the bottom of the liquid storage tank 26. At the same time, when the stirring roller 29 rotates to the highest position, it is in contact with the lowermost part of the liquid homogenizing roller 24, so that the residual liquid on the liquid homogenizing roller 24 can be scraped off to prevent the accumulation of the residual fire-retardant liquid on the liquid homogenizing roller 24. After the liquid homogenizing roller 24 is brought into contact with the fire-retardant liquid, the fire-retardant liquid is scraped evenly by the liquid homogenizing plate, the transferred fire-retardant liquid is more evenly distributed, and the fire-retardant effect after coating is better.

[0051] The drying device 3 comprises a drying box 31, the drying box 31 is provided with a drying pipeline 32, the drying pipeline 32 is provided with a heating plate, the drying pipeline 32 is communicated with an air inlet, and the drying pipeline 32 is arranged above and below the conveying direction of the composite fabric. The bottom or top of the drying pipeline 32 is provided with an air outlet facing the composite fabric, and the fire-retardant liquid is dried after being coated on the composite fabric.

[0052] As shown in Figure 2 and Figure 5 The gumming and curing device 4 comprises a gumming and drying box body 41, the gumming and drying box body 41 is a hollow cylindrical structure, the axial direction of the gumming and drying box body 41 is perpendicular to the conveying direction of the composite fabric in the fire-retardant coating box 21, the inner center of the gumming and drying box body 41 is provided with a fixed shaft 42, the outer periphery of the fixed shaft 42 is provided with a plurality of guide rollers 43, and a distance is left between the guide rollers 43 and the inner wall of the gumming and drying box 21.

[0053] The fixed shaft 42 in the gumming and drying box body 41 is supported and fixed by a support frame 46, the two ends of the fixed shaft 42 protrude out of the outer part of the gumming and drying box body 41, the outer periphery of the fixed shaft 42 is connected with a support shaft 48 through a support rod 47, the guide roller 43 is rotatably sleeved on the support shaft 48, the axial direction of the guide roller 43 is the same as that of the fixed shaft 42, the plurality of guide rollers 43 are uniformly distributed on the outer periphery of the fixed shaft 42 to form a ring shape, and the two ends of the guide roller 43 are respectively arranged at the two ends of the gumming and drying box body 41 outside to facilitate the input and output of the composite fabric. When the composite fabric enters the gumming and drying box body 41, it enters from the position of the lower guide roller 43, and the composite fabric is wound outside the plurality of guide rollers 43 to realize spiral conveying. This conveying mode can reduce the equipment volume.

[0054] The upper end of the glue drying box 41 is an input end, and the lower end is an output end. The top of the glue drying box 41 at the input end is provided with a glue storage groove 44. The bottom of the glue storage groove 44 is provided with a glue spraying head. The glue spraying head is in communication with the bottom of the glue storage groove 44 through a connecting pipe. The connecting pipe passes through the glue drying box 41. The side of the glue storage groove 44 is provided with a glue applying brush 45. The glue applying brush 45 is arranged on the inner wall of the glue drying box 41. The glue applying brush 45 is used to evenly apply the glue sprayed on the composite fabric.

[0055] A plurality of air inlets 49 are arranged at the middle position and the output end of the glue drying box 41. The air inlets 49 are uniformly distributed on the outer periphery of the glue drying box 41. The air inlets 49 are in communication with an air inlet pipe 410. The air inlet pipe 410 is provided with a heating rod. The hot air discharged from the air inlet pipe 410 enters the glue drying box 41 through the air inlets 49 to blow the surrounding composite fabric to solidify the glue. This method can dry and solidify the glue on the composite fabric for a long time in a short distance, and the solidification efficiency is high.

[0056] After the flame-retardant liquid is applied, the composite fabric enters the glue solidification device 4 for glue application and solidification. During glue application, the glue is sprayed through the glue spraying head and then evenly applied through the glue applying brush 45. After glue application, the glue is solidified and dried by the hot air input through the air inlets at the middle position and the output end of the glue drying box 41. The glue drying box 41 has a hollow cylindrical structure. The composite fabric is wound outside the guide rollers 43 arranged in the glue drying box 41 to realize spiral conveying. During solidification and drying, the hot air blows around the composite fabric. The solidification and drying efficiency is higher, and energy is saved. Glue application and solidification are both completed in the glue drying box 41. The volume of the glue drying box 41 does not need to be large, the production line occupies a small area, and the cost is reduced.

[0057] Working principle: The reinforcing layer 20 is arranged as a middle layer between the two CVC fabric layers 10. The CVC fabric layer 10, the reinforcing layer 20, and the CVC fabric layer 10 are sequentially stacked and pressed into the pressing device 1 to form a composite fabric. The reinforcing layer 20 has a net structure composed of flame-retardant threads. The flame-retardant threads are composed of nylon fiber threads and glass fiber threads. The use of the nylon fiber threads and the glass fiber threads can help the CVC flame-retardant composite fabric to have good tensile strength. The use of the nylon fiber threads and the glass fiber threads can also make the reinforcing layer have good flame-retardant effect. The use of the mesh on the reinforcing layer can increase the heat insulation effect of the CVC flame-retardant composite fabric. The composite fabric is coated with a flame-retardant coating by the flame-retardant coating device 2. A flame-retardant layer 30 is formed on the surface of the composite fabric. The composite fabric has better flame-retardant effect and higher safety performance.

[0058] When the fire-retardant coating is applied, a stirring mechanism is arranged in the liquid storage tank 26, and the fire-retardant liquid in the liquid storage tank 26 is stirred by the stirring roller 29 connected to the stirring shaft 27, so as to prevent the fire-retardant liquid from precipitating, and the rotation track of the stirring roller 29 is consistent with the structure of the bottom of the liquid storage tank 26, so as to prevent the fire-retardant liquid from precipitating in the dead angle of the bottom of the liquid storage tank 26, and meanwhile, the stirring roller 29 contacts the lowermost part of the liquid uniformizing roller 24 when it rotates to the highest position, so as to scrape off the residual liquid on the liquid uniformizing roller 24, prevent the fire-retardant liquid from accumulating on the liquid uniformizing roller 24, and scrape the fire-retardant liquid on the liquid uniformizing roller 24 evenly through the liquid uniformizing plate after the liquid uniformizing roller 24 carries the fire-retardant liquid, so that the transferred fire-retardant liquid is more evenly distributed, and the fire-retardant effect after coating is better.

[0059] After the fire-retardant liquid is coated, the fire-retardant liquid is dried by the drying device 3, and then enters the gluing and curing device 4 to form the glue layer 40, and the two protective layers 40 on the outer side of the CVC fire-retardant composite fabric pass through the gluing and curing device 4 twice to form the glue layer 40, the glue is sprayed through the glue spraying head during gluing, and then the glue is uniformly applied by the glue applying brush 45, the glue is cured and dried by the hot air input through the air inlets at the middle position and the output end of the gluing and drying box body 41 after gluing, the gluing and drying box body 41 is a hollow cylindrical structure, the composite fabric is wound outside the plurality of guide rollers 43 arranged in the gluing and drying box body 41 to realize spiral conveying, the hot air surrounds the composite fabric during curing and drying, the efficiency of curing and drying is higher, and energy is saved, and the gluing and curing are both completed in the gluing and drying box body 41, so that the volume of the gluing and drying box body 41 does not need to be large, the land occupation of the production line is reduced, and the cost is reduced.

[0060] The basic principles and main features of the present application and the advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A process for the preparation of a CVC flame resistant composite fabric, characterized in that: Includes the following steps: S1. A reinforcing layer is set between two CVC fabric layers as an interlayer. The CVC fabric layer, the reinforcing layer, and the CVC fabric layer are stacked in sequence and pressed into a pressing device to form a composite fabric. S2. The composite fabric formed by pressing enters the flame retardant coating device, and the pre-prepared flame retardant liquid is coated onto the surface of the composite fabric to form a flame retardant coating. The flame retardant coating is applied to both sides of the composite fabric simultaneously, and then dried after coating is completed. S3. The dried composite fabric enters the gluing and curing device, through which the pre-prepared protective adhesive is sprayed onto the composite fabric for coating, and cured directly after coating. Finally, the obtained CVC flame-retardant composite fabric is rolled up and packaged. When preparing CVC flame-retardant composite fabric according to the above steps S1-S3, the flame-retardant coating device and the adhesive curing device are provided, wherein the flame-retardant coating device is located at the discharge end of the pressing device and the adhesive curing device is located at the discharge end of the flame-retardant coating device. The pressing device includes a pressing box, and a hot pressing roller assembly is installed inside the pressing box. The hot pressing roller assembly includes a first hot pressing roller and a second hot pressing roller. The first hot pressing roller and the second hot pressing roller are rotatably installed inside the pressing box via a mounting shaft. The first hot pressing roller and the second hot pressing roller are arranged side by side. Hot air vents are respectively provided at the top and bottom of the pressing box. The flame-retardant coating device includes a flame-retardant coating box, which contains an upper coating roller and a lower coating roller. The composite fabric passes between the upper coating roller and the lower coating roller, and the upper coating roller and the lower coating roller simultaneously coat the upper and lower surfaces of the composite fabric with flame-retardant liquid. The upper coating roller and the lower coating roller are in contact with the liquid leveling rollers set above and below, respectively. The two liquid leveling rollers are installed through drive shafts. The two liquid leveling rollers are respectively provided with liquid storage tanks below them. The two liquid storage tanks are respectively installed and fixed. The liquid storage tanks are provided with stirring mechanisms. The stirring mechanisms stir the flame retardant liquid in the liquid storage tanks to prevent sedimentation, and at the same time scrape off residual liquid from the liquid leveling rollers. The liquid storage tank has a U-shaped cross-section. The stirring mechanism inside the liquid storage tank includes a stirring shaft, which is installed horizontally inside the liquid storage tank. Connecting rods and stirring rollers are evenly arranged around the outer periphery of the stirring shaft. The stirring rollers are located at the end of the connecting rods away from the stirring shaft. The stirring shaft drives the stirring rollers to rotate and stir the flame retardant liquid. The stirring rollers, stirring shaft, and uniform roller are arranged parallel to each other on the axis. The trajectory of the stirring rollers corresponds to the bottom of the U-shape of the liquid storage tank. The stirring rollers can stir the flame retardant liquid at the bottom of the liquid storage tank. When the stirring rollers rotate to the highest point, they contact the bottom of the uniform rollers and scrape off the residual liquid on the uniform rollers. The adhesive curing device includes an adhesive drying chamber, which is a hollow cylindrical structure. The axis of the adhesive drying chamber is perpendicular to the conveying direction of the composite fabric in the flame-retardant coating box. A fixed shaft is provided at the center of the interior of the adhesive drying chamber, and several guide rollers are provided on the outer periphery of the fixed shaft. A distance is left between the guide rollers and the inner wall of the adhesive drying chamber. The composite fabric is spirally conveyed by winding around the outside of the several guide rollers. The upper gluing drying box body has an input end and an output end, the top of the input end is provided with a glue storage groove, the bottom of the glue storage groove is provided with a glue spraying head, the glue spraying head is communicated with the bottom of the glue storage groove through a connecting pipe, the connecting pipe passes through the upper gluing drying box body, the side of the glue storage groove is provided with a glue applying brush, the glue applying brush is arranged on the inner wall of the upper gluing drying box body, and the glue on the composite fabric is evenly applied through the glue applying brush. A plurality of air inlets are arranged at the middle position and the output end of the upper gluing drying box body, the air inlets are communicated with air inlet pipelines, and heating rods are arranged in the air inlet pipelines.

2. The method for preparing a CVC flame-retardant composite fabric according to claim 1, characterized in that: The top and bottom of the pressing box are respectively provided with filter screens at the hot air inlets.

3. The method for preparing a CVC flame-retardant composite fabric according to claim 1, characterized in that: The upper coating roller and the lower coating roller are respectively arranged on two rotating shafts, one of the rotating shafts is driven to rotate by a first driving motor, intermeshing gears are respectively arranged on the two rotating shafts, and the other rotating shaft is driven to rotate by the gears; Intermeshing gears are respectively arranged on the two driving shafts on which the two liquid uniformizing rollers are arranged, one of the driving shafts is driven to rotate by a second driving motor to drive the other driving shaft to rotate, and the two driving shafts drive the two liquid uniformizing rollers to rotate at the same time. The stirring shaft is connected with the driving shaft on which the liquid uniformizing roller is arranged through gears, and the second driving motor drives the driving shaft to rotate at the same time to drive the stirring shaft to rotate.

4. The method for preparing a CVC flame-retardant composite fabric according to claim 1, characterized in that: A fixing rod is arranged above the inner wall of the liquid storage groove, one end of the fixing rod away from the inner wall of the liquid storage groove is connected with a liquid uniformizing plate, and the liquid uniformizing plate extends along the liquid uniformizing roller shaft. Among the two liquid storage grooves, the lower liquid storage groove is fixedly arranged on the inner bottom of the flame-retardant coating box, and the upper liquid storage groove is fixedly arranged on the inner top of the flame-retardant coating box through a mounting frame.

5. The method for preparing a CVC flame-retardant composite fabric according to claim 1, characterized in that: The fixing shaft in the upper gluing drying box body is supported and fixed by a support frame, the two ends of the fixing shaft protrude out of the outer part of the upper gluing drying box body, the outer periphery of the fixing shaft is connected with support shafts through support rods, guide rollers are rotatably arranged on the support shafts, the axial directions of the guide rollers are the same as that of the fixing shaft, a plurality of guide rollers are uniformly distributed on the outer periphery of the fixing shaft to form a ring, and the two ends of the guide rollers are arranged at the two ends of the upper gluing drying box body, so that the composite fabric can be input and output, and the composite fabric enters the upper gluing drying box body from the position of the lower guide roller. The plurality of air inlets are uniformly distributed on the outer periphery of the upper gluing drying box body, and the hot air discharged from the air inlet pipelines enters the upper gluing drying box body through the plurality of air inlets to blow the composite fabric around to solidify the glue.

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