Method and device for making chopped strand mat from waste glass fiber

Abstract

The invention discloses a method and device for preparing chopped strand mat from waste glass fiber. The method for preparing chopped strand mat from waste glass fiber comprises: 1) cutting the waste glass fiber into a length of 5±2 cm; 2) forming a web by a web-forming machine, and then settling and forming the material obtained in step 1); 3) applying glue and drying the material obtained in step 2); the glue used for applying glue is powder and / or emulsion, the powder used is polyvinyl alcohol powder, and the emulsion used is polyvinyl acetate emulsion; the drying adopts a hot air circulation heating method, the drying temperature is 180-230°C, and the drying time is 70-140 seconds; 4) cold pressing the material obtained in step 3) to form, longitudinally cut, cross-cut, and roll up, so as to obtain the chopped strand mat, and the cold pressing pressure is 3-4 kgf / m 2 , the temperature is 10-25°C. The present invention effectively solves the problems of difficult dispersion and poor uniformity of waste glass fibers, effectively utilizes waste glass fibers, turns waste into treasure, and obtains chopped strand mats with good uniformity, improves economic benefits, and completely solves the environmental protection problem of waste fiber treatment that has been plaguing the glass fiber industry.

Description

Technical Field

[0001] The invention relates to a method and a device for preparing chopped strand mat from waste glass fibers, belonging to the field of waste glass fiber utilization. Background Art

[0002] Waste glass fiber is the inevitable industrial tailings generated in the production of glass fiber. The normal production of this solid waste accounts for about 10% to 15% of the total glass fiber production.

[0003] In the prior art, waste glass fibers are easy to agglomerate, difficult to disperse, and have poor uniformity. Therefore, they have always been disposed of by deep land burial, which will cause serious pollution to the land and result in a large waste of land resources. With the increasing emphasis on environmental protection, deep burial is obviously no longer feasible. Summary of the invention

[0004] The present invention provides a method and device for preparing chopped strand mat from waste glass fibers, which effectively solves the problems of difficult dispersion and poor uniformity of waste glass fibers, effectively utilizes the waste glass fibers, and obtains chopped strand mat with good uniformity, which not only greatly saves the raw material cost of the chopped strand mat and has good economic benefits, but also thoroughly solves the environmental protection problem of waste fiber treatment that has been plaguing the glass fiber industry, has excellent social benefits, and truly realizes "turning waste into treasure".

[0005] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0006] A method for preparing chopped strand mat from waste glass fibers comprises the following steps:

[0007] 1) Cut the waste glass fiber into a length of 5±2 cm;

[0008] 2) forming the material obtained in step 1) into a net by a net-forming machine, and then settling and forming;

[0009] 3) Gluing and drying the material obtained in step 2); the glue used for sizing is powder and / or emulsion, the powder used is polyvinyl alcohol powder, and the emulsion used is polyvinyl acetate emulsion; the drying is carried out by hot air circulation heating, the drying temperature is 180-230° C., and the drying time is 70-140 seconds;

[0010] 4) The material obtained in step 3) is cold pressed into shape, cut longitudinally, cut crosswise, and rolled up to obtain chopped strand mat. The cold pressing pressure is 3-4 kgf / m 2 , the temperature is 10-25℃.

[0011] In the above step 2), the sedimentation molding can make the chopped fibers evenly distributed without orientation and cross-section; in step 3), the selection of drying temperature and time ensures the uniformity of glue penetration and the flatness of the obtained product, while ensuring the structural strength of the obtained product; the setting of cold pressing molding pressure and temperature in step 4) is also very critical, which directly determines the structural stability of the product. The chopped strand mat obtained by the above method not only has good uniformity, but also has no delamination and de-filamentation phenomenon, which not only turns waste into treasure, but also well guarantees the quality of the obtained product.

[0012] In order to further improve the dispersion uniformity of the chopped strand mat, in step 2), the total pressure during sedimentation molding is 1800 Pa.

[0013] In the above step 3), the polyvinyl alcohol powder is preferably Shanghai Yingjia brand polyvinyl alcohol powder PVA1799. The polyvinyl acetate emulsion is preferably Huakai 730-polyvinyl acetate emulsion.

[0014] In order to further improve the structural strength of the chopped strand mat, in step 3), the sizing includes the following steps in sequence: spraying powder, vibration, water spraying and emulsion spraying, the mass amount of powder is 4-5% of the mass of waste glass fiber, the mass of water spraying is 8-10% of the mass of waste glass fiber, and the mass amount of emulsion is 5-8% of the mass of waste glass fiber. Water spraying is for better adhesion of powder. Both water spraying and emulsion spraying are sprayed by water mist.

[0015] A device for making chopped strand mat from waste glass fiber, comprising: a fiber chopper, a web forming machine, a sedimentation and homogenization section, a sizing section, a drying section, a cold pressing and curing section and a winding section connected in sequence;

[0016] The sedimentation and homogenization section includes the first circulation conveying network, the conveying pipe, the equalizing chamber and the sedimentation fan; the width of one end of the conveying pipe is equal to the width of the first circulation conveying network and is connected to the bottom of the first circulation conveying network, and the other end of the conveying pipe is connected to one end of the equalizing chamber; the sedimentation fan is connected to the other end of the equalizing chamber; it can ensure that each hole of the first circulation conveying network has a uniform air volume passing through, ensuring the uniform distribution of fibers over the entire width of the felt sheet, sedimentation fan, preferred parameters: flow rate 14350M 3 / H, full pressure 1800Pa, speed 1450 rpm;

[0017] The glue application section includes a second circulating conveying net and a powder spreading device, a water-based spraying device and an emulsion spraying device which are sequentially arranged above the second circulating conveying net; a powder recovery device, a water-based recovery device and a latex recovery device are sequentially arranged below the second circulating conveying net, the powder recovery device is arranged opposite to the powder spreading device, the water-based recovery device is arranged opposite to the water-based spraying device, and the latex recovery device is arranged opposite to the emulsion spraying device; an electric vibrator is arranged on the second circulating conveying net between the powder spreading device and the water-based spraying device;

[0018] The drying section includes a drying chamber and a third circulating conveying net. A feed port and a discharge port are respectively arranged at both ends of the drying chamber. The starting end of the third circulating conveying net is located at the feed port of the drying chamber, and the terminal end of the third circulating conveying net is located at the discharge port of the drying chamber.

[0019] The cold pressing and curing section includes a supporting surface and circulating water-type cold pressing rollers. There are three pairs of circulating water-type cold pressing rollers. The two circulating water-type cold pressing rollers of each pair of circulating water-type cold pressing rollers are relatively arranged on the upper and lower sides of the supporting surface; the first circulating conveying network, the second circulating conveying network, the third circulating conveying network and the supporting surface are connected in sequence.

[0020] The above-mentioned circulating conveying net can drive the materials on the circulating conveying net to flow forward through the circulating rolling of the closed conveying net. The setting of the brackets and the like used for placement in each section can use the existing technology.

[0021] In order to further improve the uniformity of material distribution, there are two web forming machines with the same structure and connected front and back, which further improves the uniformity of glass fiber distribution.

[0022] In order to further improve the uniformity of dispersion of waste glass fibers, a web-forming machine includes a web-forming chamber, in which a first conveying curtain, a first corner nail curtain, a second corner nail curtain and a second conveying curtain are installed in sequence, wherein the end of the second conveying curtain is located outside the web-forming chamber; the first corner nail curtain is an oblique upward structure, and the second corner nail curtain is an oblique downward structure, the angle between the working surface of the first corner nail curtain and the horizontal plane is 125-135°, and the angle between the working surface of the second corner nail curtain and the horizontal plane is 40-50°; the two web-forming machines are respectively the first web-forming machine and the second web-forming machine, the fiber chopping machine is connected to the first conveying curtain of the first web-forming machine, the second conveying curtain of the first web-forming machine is connected to the first conveying curtain of the second web-forming machine, and the second conveying curtain of the second web-forming machine is connected to the first circulating conveying net.

[0023] In order to further improve the uniformity of the dispersion of the waste glass fibers, the first corner nail curtain and the second corner nail curtain are both provided with more than two rows of corner nails along the length direction, and the corner nails in two adjacent rows are staggered.

[0024] More preferably, the spacing between two adjacent rows of corner nails on the first corner nail curtain and the second corner nail curtain is 35-45 mm, the corner nails on the first corner nail curtain are arranged obliquely upward, and the angle between them and the plane where the first corner nail curtain is located is 40-50 degrees; the corner nails on the second corner nail curtain are arranged obliquely downward, and the angle between them and the plane where the second corner nail curtain is located is 50-60 degrees.

[0025] In order to better ensure the uniformity of the dispersion of the waste glass fibers, the spacing between the corner nails in the same row on the first corner nail curtain and the second corner nail curtain is 25-35 mm; the length of the corner nails on the first corner nail curtain and the second corner nail curtain is 25-35 mm. The corner nails are steel nails with the tip facing upward. The above-mentioned web forming machine has good stability and good dispersion uniformity.

[0026] In order to further improve the uniformity of waste glass fiber dispersion, the first pressure roller and the material distribution roller are installed in sequence from upstream to downstream above the first corner nail curtain, and four rows of material distribution nails are evenly distributed on the surface of the material distribution roller along the circumference; a material beating roller is provided above the second corner nail curtain, and four rows of material beating nails are evenly distributed on the surface of the material beating roller along the circumference. The waste glass fibers on the first corner nail curtain are first homogenized by the first pressure roller, and then further homogenized by the material distribution roller, and finally flow to the second corner nail curtain, where the waste glass fibers are knocked down by the material beating roller and evenly fall to the second conveying curtain.

[0027] In order to reduce material loss and environmental pollution, the end of the second corner nail curtain is higher than the second conveying curtain, and a first material dropping channel is provided between the second corner nail curtain and the second conveying curtain.

[0028] The glass fiber is fed into the first conveying curtain, then taken away by the first corner nail curtain, passes through the pressure roller and the material distribution roller in sequence, and enters the second corner nail curtain. The glass fiber on the second corner nail curtain is peeled off by the material beating roller, passes through the first blanking channel, and falls onto the second conveying curtain.

[0029] In order to further improve the uniformity of the dispersion of the waste glass fibers, the end of the second conveying curtain of the second web-forming machine is higher than the first circulating conveying net, a second blanking channel is provided between the end of the second conveying curtain and the first circulating conveying net, and the end of the conveying pipe connected to the bottom of the first circulating conveying net is located directly below the second blanking channel. The waste glass fibers at the end of the second conveying curtain fall onto the first circulating conveying net through the second blanking channel, and are equalized by pressure in the equalizing chamber and transported to the bottom of the first circulating conveying net through the conveying pipe for negative pressure sedimentation homogenization.

[0030] In order to further improve the uniformity of waste glass fiber dispersion, a second pressure roller is provided above the second conveying curtain, and the surface of the second pressure roller is provided with a knurled pattern. The height of the second pressure roller can be adjusted to keep the fed fiber in a holding state, thereby improving the uniformity of the web. The surface of the second pressure roller is knurled to increase the friction without sticking to the fiber. The second pressure roller is synchronously driven with the second conveying curtain.

[0031] In order to save space, the corner nail curtain is a closed ring, driven by the first roller, the second roller and the third roller arranged in a triangle, the corner nail curtain between the first roller and the second roller forms the first corner nail curtain, and the corner nail curtain between the second roller and the third roller forms the second corner nail curtain. The installation of each roller and other equipment can be carried out by the existing method, as long as the structure particularly emphasized in this application can be achieved.

[0032] The above-mentioned web-forming machine can be used to evenly distribute the short-cut fibers.

[0033] In order to improve the stability of sedimentation molding and ensure the uniformity of waste glass fiber dispersion, the pressure equalization chamber includes a square box body, with air inlets and air outlets at both ends of the box body respectively, the air inlet of the box body is connected to the conveying pipe, and the air outlet of the box body is connected to the sedimentation fan. The inside of the box body, from the air outlet to the air inlet, is provided with a first baffle, a second baffle, a third baffle and a fourth baffle in sequence. The first baffle and the third baffle are arranged at the top of the inside of the box body, and the third baffle and the fourth baffle are arranged at the bottom of the inside of the box body. The sum of the heights of the first baffle and the second baffle is 40-50mm greater than the height of the inside of the box body. The sum of the heights of the third baffle and the fourth baffle is 40-50mm greater than the height of the inside of the box body. The filter screen is a galvanized steel wire mesh, and the filter holes on the filter screen are 6mm×6mm square holes. The above structure can well ensure the stability of the wind pressure and air volume of sedimentation molding, and thus better ensure the uniformity of waste glass fiber dispersion.

[0034] In order to further improve the uniformity of waste glass fiber dispersion, as a preferred implementation scheme, the powder spreading device includes a spreading funnel and a spreading roller arranged below the spreading funnel, a filter screen is provided at the bottom of the spreading funnel, and the spreading funnel and the spreading roller are both installed on brackets on both sides of the width direction of the second circulating conveying network; the water agent spraying device includes a watering pipe, the length direction of the watering pipe is consistent with the width direction of the second circulating conveying network, 6-8 first water mist nozzles with downward spraying direction are evenly distributed along the length direction of the watering pipe, and the watering pipe is installed on brackets on both sides of the width direction of the second circulating conveying network; the emulsion spraying device includes an emulsion tube, the length direction of the emulsion tube is consistent with the width direction of the second circulating conveying network, 6-8 second water mist nozzles with downward spraying direction are evenly distributed along the length direction of the emulsion tube, and the emulsion is installed on brackets on both sides of the width direction of the second circulating conveying network.

[0035] In order to improve the conveying stability of the device, the first and second circulating conveyor nets adopt friction transmission, and the third circulating conveyor net adopts chain traction. This solves the problem that the net belt is easy to deviate and the operation is unstable.

[0036] In order to improve the drying effect, the drying room has four sections connected in sequence, and the drying room adopts hot air circulation heating; from upstream to downstream, the drying temperatures of the four sections are 180-185℃, 200-210℃, 210-220℃ and 190-200℃, and the drying time of the four sections is 17-35 seconds respectively. The above-mentioned segmented drying setting can better ensure the uniformity and stability of drying, is easy to control, and can make the hot air reasonably and evenly distributed on the felt surface, avoiding the problems of brittleness, hardness and slow penetration of the dried felt pieces; ensuring the good drying effect of the product.

[0037] In this application, directional words such as up and down, left and right, top, and bottom all refer to the relative position of the device in normal use. The direction from upstream to downstream in this application is the flow direction of materials during production.

[0038] The technologies not mentioned in the present invention are all referred to the prior art.

[0039] The method for preparing chopped strand mat from waste glass fibers of the present invention effectively solves the problems of difficult dispersion and poor uniformity of waste glass fibers, effectively utilizes the waste glass fibers, and the obtained chopped strand mat has good uniformity, which not only greatly saves the raw material cost of the chopped strand mat and has good economic benefits, but also completely solves the environmental protection problem of waste fiber treatment that has been plaguing the glass fiber industry, has excellent social benefits, and truly realizes "turning waste into treasure". BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of a device for making chopped strand mat using waste glass fibers according to the present invention;

[0041] Figure 2 It is a structural schematic diagram of the web-forming machine of the present invention;

[0042] Figure 3 It is a schematic diagram of the structure of the pressure equalizing chamber of the present invention;

[0043] Figure 4 This is a schematic diagram of the structure of the powder spreading device of the present invention;

[0044] In the figure, 1 is a fiber chopper, 2 is a first web-forming machine, 201 is a web-forming chamber, 202 is a first conveying curtain, 203 is a first corner nail curtain, 204 is a second corner nail curtain, 205 is a second conveying curtain, 206 is a first pressing roller, 207 is a material equalizing roller, 208 is a material beating roller, 209 is a first material dropping channel, 210 is a second pressing roller, 3 is a second web-forming machine, 4 is a sedimentation and equalization section, 401 is a first circulating conveying net, 402 is a conveying pipe, 403 is a pressure equalizing chamber, 4031 is a box, 4032 is an air inlet, 4033 is an air outlet, 4034 is a first baffle, 4035 is a second baffle, and 4036 is a filter net , 4037 is the third baffle, 4038 is the fourth baffle, 404 is the sedimentation fan, 405 is the second channel, 5 is the glue application section, 501 is the second circulating conveying network, 5011 is the bracket on both sides of the width direction of the second circulating conveying network, 502 is the powder spreading device, 5021 is the spreading funnel, 5022 is the spreading roller, 5023 is the funnel mounting bracket, 5024 is the spreading roller, 503 is the water agent spraying device, 504 is the emulsion spraying device, 6 is the drying section, 601 is the third circulating conveying network, 602 is the drying chamber, 7 is the cold pressing curing section, 701 is the supporting surface, 702 is the circulating water type cold pressing roller, and 8 is the winding section. DETAILED DESCRIPTION

[0045] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with the embodiments, but the content of the present invention is not limited to the following embodiments.

[0046] Waste glass fiber comes from industrial tailings generated in glass fiber production. The method for making chopped strand mat using waste glass fiber includes the following steps:

[0047] 1) Cut the waste glass fiber into 5 cm length;

[0048] 2) The material obtained in step 1) is formed into a web by a web-forming machine, and then precipitated to form a web, so that the short-cut fibers can be evenly distributed in an unoriented and cross-linked manner;

[0049] 3) Gluing and drying the material obtained in step 2), and the drying adopts hot air circulation heating mode; spraying powder, vibration, water spraying and emulsion spraying, the mass amount of powder is 4.5% of the mass of waste glass fiber, the mass of water spraying is 9% of the mass of waste glass fiber, and the mass amount of emulsion is 6% of the mass of waste glass fiber. The powder used is Shanghai Yingjia brand polyvinyl alcohol powder PVA1799, and the emulsion used is Huakai 730-polyvinyl acetate emulsion; water spraying and emulsion spraying are both sprayed by water mist;

[0050] 4) The material obtained in step 3) is cold pressed into shape, cut longitudinally, cut crosswise, and rolled up to obtain chopped strand mat. The cold pressing pressure is 3.5 kgf / m 2 , the temperature is 10-15℃.

[0051] like Figure 1 As shown, the device used in the above method includes: a fiber chopper, a web forming machine, a sedimentation and homogenization section, a sizing section, a drying section, a cold pressing and curing section and a winding section connected in sequence;

[0052] The sedimentation and homogenization section includes the first circulation conveying network, conveying pipe, equalizing chamber and sedimentation fan; the width of one end of the conveying pipe is equal to the width of the first circulation conveying network and is connected to the bottom of the first circulation conveying network, and the other end of the conveying pipe is connected to one end of the equalizing chamber; the sedimentation fan is connected to the other end of the equalizing chamber; it can ensure that each hole of the first circulation conveying network has a uniform air volume passing through, ensuring the uniform distribution of fibers over the entire width of the felt sheet, sedimentation fan, flow rate 14350M 3 / H, full pressure 1800Pa, speed 1450 rpm;

[0053] The glue application section includes a second circulating conveying network and a powder spreading device, a water-based spraying device and an emulsion spraying device which are sequentially arranged above the second circulating conveying network; a powder recovery device, a water-based recovery device and a latex recovery device are sequentially arranged below the second circulating conveying network, the powder recovery device is arranged opposite to the powder spreading device, the water-based recovery device is arranged opposite to the water-based spraying device, and the latex recovery device is arranged opposite to the emulsion spraying device; an electric vibrator is arranged on the second circulating conveying network between the powder spreading device and the water-based spraying device, for further homogenizing the powder spread;

[0054] The drying section includes a drying chamber and a third circulating conveying net. A feed port and a discharge port are respectively arranged at both ends of the drying chamber. The starting end of the third circulating conveying net is located at the feed port of the drying chamber, and the terminal end of the third circulating conveying net is located at the discharge port of the drying chamber.

[0055] The cold pressing and curing section includes a supporting surface and circulating water-type cold pressing rollers. There are three pairs of circulating water-type cold pressing rollers. The two circulating water-type cold pressing rollers of each pair of circulating water-type cold pressing rollers are relatively arranged on the upper and lower sides of the supporting surface; the first circulating conveying network, the second circulating conveying network, the third circulating conveying network and the supporting surface are connected in sequence.

[0056] like Figure 2 As shown, the web-forming machine includes a web-forming chamber, in which a first conveying curtain, a first corner nail curtain, a second corner nail curtain and a second conveying curtain are installed in sequence, wherein the end of the second conveying curtain is located outside the web-forming chamber; the first corner nail curtain is an oblique upward structure, and the second corner nail curtain is an oblique downward structure, the angle between the working surface of the first corner nail curtain and the horizontal plane is 130°, and the angle between the working surface of the second corner nail curtain and the horizontal plane is 45°; there are two web-forming machines with the same structure and connected front to back, the two web-forming machines are respectively the first web-forming machine and the second web-forming machine, the fiber chopping machine is connected to the first conveying curtain of the first web-forming machine, the second conveying curtain of the first web-forming machine is connected to the first conveying curtain of the second web-forming machine, and the second conveying curtain of the second web-forming machine is connected to the first circulating conveying net.

[0057] The first corner nail curtain and the second corner nail curtain are both provided with more than two rows of corner nails along the length direction, and the two adjacent rows of corner nails are staggered; the spacing between the two adjacent rows of corner nails on the first corner nail curtain and the second corner nail curtain is 40mm, the corner nails on the first corner nail curtain are arranged obliquely upward, and the angle with the plane where the first corner nail curtain is located is 45°; the corner nails on the second corner nail curtain are arranged obliquely downward, and the angle with the plane where the second corner nail curtain is located is 55°; the spacing between the corner nails in the same row on the first corner nail curtain and the second corner nail curtain is 30mm; the length of the corner nails on the first corner nail curtain and the second corner nail curtain is 30mm. The corner nails are steel nails with the tip facing upward.

[0058] A first pressing roller and a material balancing roller are installed in sequence from upstream to downstream above the first corner nail curtain, and four rows of material balancing nails are evenly distributed on the surface of the material balancing roller along the circumferential direction; a material beating roller is provided above the second corner nail curtain, and four rows of material beating nails are evenly distributed on the surface of the material beating roller along the circumferential direction.

[0059] The end of the second corner nail curtain is higher than the second conveying curtain, and a first blanking channel is provided between the second corner nail curtain and the second conveying curtain. The glass fiber is fed into the first conveying curtain, and then taken away by the first corner nail curtain, and enters the second corner nail curtain after passing through the pressure roller and the material equalizing roller in sequence. The glass fiber on the second corner nail curtain is peeled off by the material beating roller, and falls onto the second conveying curtain after passing through the blanking channel. In order to further improve the uniformity of the dispersion of the waste glass fiber, the end of the second conveying curtain of the second web-forming machine is higher than the first circulating conveying net, and a second blanking channel is provided between the end of the second conveying curtain and the first circulating conveying net, and the end of the conveying pipe connected to the bottom of the first circulating conveying net is located directly below the second blanking channel. The waste glass fiber at the end of the second conveying curtain falls on the first circulating conveying net through the second blanking channel, and is equalized by passing through the pressure equalizing chamber and being transported to the bottom of the first circulating conveying net through the conveying pipe for negative pressure sedimentation homogenization.

[0060] A second pressing roller is arranged above the second conveying curtain, and the surface of the second pressing roller is provided with knurled patterns. The height of the second pressing roller can be adjusted to keep the fed fibers in a holding state, thereby improving the uniformity of the web. The surface of the second pressing roller is knurled to increase the friction force without sticking to the fibers. The second pressing roller is synchronously driven with the second conveying curtain.

[0061] The corner nail curtain is a closed ring, and is driven by the first roller, the second roller and the third roller arranged in a triangle for circular transmission. The corner nail curtain between the first roller and the second roller forms the first corner nail curtain, and the corner nail curtain between the second roller and the third roller forms the second corner nail curtain.

[0062] like Figure 3 As shown, the pressure equalizing chamber includes a square box body, and an air inlet and an air outlet are respectively arranged at both ends of the box body. The air inlet of the box body is connected to the conveying pipe, and the air outlet of the box body is connected to the settling fan. The inside of the box body, from the air outlet to the air inlet, is provided with a first baffle, a second baffle, a third baffle and a fourth baffle in sequence. The first baffle and the third baffle are arranged at the top of the inside of the box body, and the third baffle and the fourth baffle are arranged at the bottom of the inside of the box body. The sum of the heights of the first baffle and the second baffle is 40-50mm greater than the height of the inside of the box body. The sum of the heights of the third baffle and the fourth baffle is 40-50mm greater than the height of the inside of the box body. The filter screen is a galvanized steel wire mesh, and the filter holes on the filter screen are 6mm×6mm square holes.

[0063] like Figure 4As shown, the powder spreading device includes a spreading funnel and a spreading roller arranged below the spreading funnel, a filter net is provided at the bottom of the spreading funnel, and the spreading funnel and the spreading roller are both installed on brackets on both sides of the width direction of the second circulating conveying network; the water agent spraying device includes a watering pipe, the length direction of the watering pipe is consistent with the width direction of the second circulating conveying network, 8 first water mist nozzles with downward spraying direction are evenly distributed along the length direction of the watering pipe, and the watering pipe is installed on brackets on both sides of the width direction of the second circulating conveying network; the emulsion spraying device includes an emulsion tube, the length direction of the emulsion tube is consistent with the width direction of the second circulating conveying network, 8 second water mist nozzles with downward spraying direction are evenly distributed along the length direction of the emulsion tube, and the emulsion is installed on brackets on both sides of the width direction of the second circulating conveying network.

[0064] The first and second circulating conveyor networks adopt friction transmission; the third circulating conveyor network adopts chain traction, which solves the problem that the belt is easy to deviate and the operation is unstable.

[0065] The drying chamber has four sections, and the drying chamber adopts hot air circulation heating; from upstream to downstream, the drying temperatures of the four sections are 180-185℃, 200-210℃, 210-220℃ and 190-200℃ respectively, and the drying time of the four sections is 25 seconds respectively.

[0066] After the waste glass fiber is cut into 5cm length by the fiber chopper, it enters the first conveying curtain of the first web-forming machine, and after being homogenized by the first corner nail curtain and the second corner nail curtain, it falls into the second conveying curtain, and then enters the first conveying curtain of the second web-forming machine. After the same homogenization process as that on the first web-forming machine, it flows into the first circulating conveying net for sedimentation molding, so that the short-cut fibers are evenly distributed without orientation and cross-section, and then flows into the second circulating conveying net for sizing (sizing includes spraying powder, vibration, water spraying and emulsion spraying in sequence, and the powder mass dosage is The mass of the waste glass fiber is 4.5%, the mass of the water spray is 9%, the mass of the emulsion is 6%, the powder used is Shanghai Yingjia brand polyvinyl alcohol powder PVA1799, and the emulsion used is Huakai 730-polyvinyl acetate emulsion; both the water spray and the emulsion spray are sprayed with water mist), and then flow into the third circulating conveying network for drying operation, and finally flow into the supporting surface for cold pressing and curing molding (the cold pressing molding pressure of each pair of circulating water cold pressing rollers is 3.5 kgf / m 2 , the temperature is 10-15℃), and then enters the winding section for winding. When it reaches the set length, it is cut. Under the traction of the winding and the push of each circulating conveyor network, the chopped strand mat is produced continuously, forming a continuous production process.

[0067] Production capacity of the above device: 3000 tons / year; (based on 300g / m 2); Product width: 2100 mm; Product specifications: 100, 120, 150, 200, 225, 250, 300, 380, 450, 550 or 600 g / m 2 ; Product uniformity: The average weight deviation of different specifications is less than 1%, and the product surface is uniform and flat, without delamination or shedding.

Claims

1. A method for producing chopped strand mat from waste glass fibers, characterized in that: The device for making chopped strand mat from waste glass fiber comprises: a fiber chopper, a web forming machine, a sedimentation and homogenization section, a sizing section, a drying section, a cold pressing and curing section and a winding section connected in sequence; The sedimentation and homogenization section includes a first circulation conveying network, a conveying pipe, a pressure equalizing chamber and a sedimentation fan; the width of one end of the conveying pipe is equal to the width of the first circulation conveying network and is connected to the bottom of the first circulation conveying network, and the other end of the conveying pipe is connected to one end of the pressure equalizing chamber; the sedimentation fan is connected to the other end of the pressure equalizing chamber; The glue application section includes a second circulating conveying net and a powder spreading device, a water-based spraying device and an emulsion spraying device which are sequentially arranged above the second circulating conveying net; a powder recovery device, a water-based recovery device and a latex recovery device are sequentially arranged below the second circulating conveying net, the powder recovery device is arranged opposite to the powder spreading device, the water-based recovery device is arranged opposite to the water-based spraying device, and the latex recovery device is arranged opposite to the emulsion spraying device; an electric vibrator is arranged on the second circulating conveying net between the powder spreading device and the water-based spraying device; The drying section includes a drying chamber and a third circulating conveying net. A feed port and a discharge port are respectively arranged at both ends of the drying chamber. The starting end of the third circulating conveying net is located at the feed port of the drying chamber, and the terminal end of the third circulating conveying net is located at the discharge port of the drying chamber. The cold pressing and curing section includes a supporting surface and circulating water cold pressing rollers. There are three pairs of circulating water cold pressing rollers. The two circulating water cold pressing rollers of each pair of circulating water cold pressing rollers are arranged oppositely on the upper and lower sides of the supporting surface. The first circulating conveying net, the second circulating conveying net, the third circulating conveying net and the supporting surface are connected in sequence. The pressure equalizing chamber includes a square box body, and an air inlet and an air outlet are respectively arranged at both ends of the box body. The air inlet of the box body is connected to the conveying pipe, and the air outlet of the box body is connected to the settling fan. The inside of the box body, from the air outlet to the air inlet, is provided with a first baffle, a second baffle, a filter screen, a third baffle and a fourth baffle in sequence. The first baffle and the third baffle are arranged at the top of the inside of the box body, and the third baffle and the fourth baffle are arranged at the bottom of the inside of the box body. The sum of the heights of the first baffle and the second baffle is 40-50 mm greater than the height of the inside of the box body, and the sum of the heights of the third baffle and the fourth baffle is 40-50 mm greater than the height of the inside of the box body. The filter screen is a galvanized steel wire mesh, and the filter holes on the filter screen are 6 mm×6 mm square holes. The powder spreading device includes a spreading funnel and a spreading roller arranged below the spreading funnel. A filter net is arranged at the bottom of the spreading funnel. The spreading funnel and the spreading roller are both mounted on brackets on both sides of the width direction of the second circulating conveying network. The water agent spraying device includes a watering pipe. The length direction of the watering pipe is consistent with the width direction of the second circulating conveying network. 6-8 first water mist nozzles with downward spraying directions are evenly distributed along the length direction of the watering pipe. The watering pipe is mounted on brackets on both sides of the width direction of the second circulating conveying network. The emulsion spraying device includes an emulsion tube. The length direction of the emulsion tube is consistent with the width direction of the second circulating conveying network. 6-8 second water mist nozzles with downward spraying directions are evenly distributed along the length direction of the emulsion tube. The emulsion is mounted on brackets on both sides of the width direction of the second circulating conveying network. The method for preparing chopped strand mat from waste glass fiber comprises the following steps: 1) Cut the waste glass fiber into a length of 5±2 cm; 2) forming the material obtained in step 1) into a net by a net-forming machine, and then settling and forming; 3) Gluing and drying the material obtained in step 2); the glue used for sizing is powder and emulsion, the powder used is polyvinyl alcohol powder, and the emulsion used is polyvinyl acetate emulsion; the drying adopts hot air circulation heating method, the drying temperature is 180-230° C., and the drying time is 70-140 seconds; 4) The material obtained in step 3) is cold pressed into shape, cut longitudinally, cut crosswise, and rolled up to obtain chopped strand mat. The cold pressing pressure is 3-4 kgf / m 2 , the temperature is 10-25℃; In step 2), during sedimentation molding, the total pressure is 1800Pa; in step 3), the sizing includes the following steps in sequence: powdering, vibration, water spraying and emulsion spraying, the mass amount of powder is 4-5% of the mass of waste glass fiber, the mass of water spraying is 8-10% of the mass of waste glass fiber, and the mass amount of emulsion is 5-8% of the mass of waste glass fiber.

2. The method for producing chopped strand mat using waste glass fibers as claimed in claim 1, characterized in that: There are two web-forming machines with the same structure and connected front to back.

3. The method for producing chopped strand mat using waste glass fibers as claimed in claim 1 or 2, characterized in that: The web-forming machine includes a web-forming room, in which a first conveying curtain, a first corner nail curtain, a second corner nail curtain and a second conveying curtain are installed in sequence, wherein the end of the second conveying curtain is located outside the web-forming room; the first corner nail curtain is an oblique upward structure, and the second corner nail curtain is an oblique downward structure, the angle between the working surface of the first corner nail curtain and the horizontal plane is 125-135°, and the angle between the working surface of the second corner nail curtain and the horizontal plane is 40-50°; the two web-forming machines are respectively the first web-forming machine and the second web-forming machine, the fiber chopping machine is connected to the first conveying curtain of the first web-forming machine, the second conveying curtain of the first web-forming machine is connected to the first conveying curtain of the second web-forming machine, and the second conveying curtain of the second web-forming machine is connected to the first circulating conveying net.

4. The method for producing chopped strand mat using waste glass fibers as claimed in claim 3, characterized in that: The first corner nail curtain and the second corner nail curtain are both provided with more than two rows of corner nails along the length direction, and the two adjacent rows of corner nails are staggered; the spacing between the two adjacent rows of corner nails on the first corner nail curtain and the second corner nail curtain is 35-45mm; the spacing between the corner nails in the same row on the first corner nail curtain and the second corner nail curtain is 25-35mm; the corner nails on the first corner nail curtain are arranged obliquely upward, and the angle with the plane where the first corner nail curtain is located is 40-50°; the corner nails on the second corner nail curtain are arranged obliquely downward, and the angle with the plane where the second corner nail curtain is located is 50-60°; the length of the corner nails on the first corner nail curtain and the second corner nail curtain is 25-35mm.

5. The method for producing chopped strand mat using waste glass fibers as claimed in claim 3, characterized in that: A first pressing roller and a material distributing roller are installed in sequence from upstream to downstream above the first corner nail curtain, and four rows of material distributing nails are evenly distributed on the surface of the material distributing roller along the circumferential direction; a material beating roller is provided above the second corner nail curtain, and four rows of material beating nails are evenly distributed on the surface of the material beating roller along the circumferential direction; a second pressing roller is provided above the second conveying curtain, and a mesh knurling is provided on the surface of the second pressing roller.

6. The method for producing chopped strand mat using waste glass fibers as claimed in claim 3, characterized in that: The end of the second corner nail curtain is higher than the second conveying curtain, and a first blanking channel is provided between the second corner nail curtain and the second conveying curtain; the end of the second conveying curtain of the second net forming machine is higher than the first circulating conveying net, and a second blanking channel is provided between the end of the second conveying curtain and the first circulating conveying net, and the end of the conveying pipe connected to the bottom of the first circulating conveying net is located directly below the second blanking channel.

7. The method for producing chopped strand mat using waste glass fibers as claimed in claim 1 or 2, characterized in that: The drying chamber has four sections connected in sequence, and the drying chamber adopts hot air circulation heating; from upstream to downstream, the drying temperatures of the four sections are 180-185℃, 200-210℃, 210-220℃ and 190-200℃ respectively, and the drying time of the four sections is 17-35 seconds.

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