CN113524826A - Circulating needling thick felt and processing technology thereof - Google Patents
Circulating needling thick felt and processing technology thereof Download PDFInfo
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- CN113524826A CN113524826A CN202010284294.0A CN202010284294A CN113524826A CN 113524826 A CN113524826 A CN 113524826A CN 202010284294 A CN202010284294 A CN 202010284294A CN 113524826 A CN113524826 A CN 113524826A
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Abstract
The invention relates to a circulating needling thick felt and a processing technology thereof, which are applied to the technical field of needling felts and solve the technical problem that the thick felt produced by the existing processing method can not meet the use requirement aiming at the heat insulation of an ultra-high temperature smelting furnace, the thick felt comprises a felt net base layer and a felt layer to be needled, the felt layer to be needled is circularly wound and coated on the surface of the felt net base layer by adopting the needling technology until the thick felt with the required thickness is reached, and the thickness of the thick felt is more than 50 mm; the felt layer to be needled is circularly wound and needled and is coated on the surface of the felt net base layer, so that thick felt with required thickness is achieved, felts are prevented from directly penetrating through the thick felt with required thickness, and the use requirement is met.
Description
Technical Field
The invention relates to the technical field of needled felts, in particular to a circulating needled thick felt and a processing technology thereof.
Background
Along with the enhancement of the environmental awareness of people, the application range of the needled felt is continuously expanded, and the requirements on the performances of the needled felt, such as temperature resistance, chemical stability, corrosion resistance, adsorption, and the like, are higher and higher in the fields of high-temperature purification, heat insulation, heat preservation, and the like. In the smelting process of the smelting furnace of more than 1300 degrees, the needled felt with very thick thickness needs to be carbonized to form a hard carbon felt, and the hard carbon felt is adopted to insulate heat and preserve heat of the smelting furnace.
The Chinese patent with publication number CN101012600 discloses an ultra-thick glass fiber needled felt and a manufacturing method thereof, the ultra-thick glass fiber needled felt comprises a plurality of layers of glass fiber felt nets which are laid together, the glass fiber felt nets are glass short-filament fiber felt nets, vertical short-filament fibers formed by needling are inserted between each layer of the plurality of layers of felt nets at intervals, the vertical short-filament fibers are mutually connected with the fibers of each layer of the felt nets, the vertical short-filament fibers comprise upper vertical short-filament fibers inserted into the plurality of layers of glass fiber felt nets from the upper surfaces of the plurality of layers of glass fiber felt nets and lower vertical short-filament fibers inserted into the plurality of layers of glass fiber felt nets from the lower surfaces of the plurality of layers of glass fiber felt nets, and the thickness of the needled felt is 25-50 mm. The needled felt has good temperature resistance, corrosion resistance and filtering performance.
However, the above technical solutions have the following disadvantages: when the manufacturing method is adopted for needling, the multilayer glass fiber net which is laid together is directly needled, and the thickness of the produced needled felt is 25-50 mm; because the needle stroke range of the felting needles is limited, when the needled felt with higher thickness needs to be processed, the felting needles are difficult to pierce the needled felt at the lower layer, the needling effect is influenced, and the strength of a product is reduced, so that when the needled felt with high thickness needs to be used, multiple layers of needled felts can be generally overlapped for adhesion use, but the effect of the needle felts formed by adhesion is unstable in the using process, and the using requirements can not be better met.
Therefore, according to the use requirement, the production of the high-thickness needled felt is a problem to be solved urgently.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a circulating needling type thick felt and a processing technology thereof.
The above object of the present invention is achieved by the following technical solutions:
the circulating needling thick felt comprises a felt net base layer and a felt layer to be needled, wherein the felt layer to be needled is wound and coated on the surface of the felt net base layer in a circulating manner by adopting a needling process until the thick felt with the required thickness is reached, and the thickness of the thick felt is more than 50 mm.
Through adopting above-mentioned technical scheme, adopt the mode of circulation acupuncture, the felting needle can be in certain depth range will treat acupuncture felt layer circulation winding cladding on the surface of felt-net basic unit, avoids the felting needle directly to pass the thick felt of required thickness, and then has improved the intensity of thick felt, finally can reach the thick felt of required thickness to it is thermal-insulated to satisfy the smelting furnace to ultra-high temperature, avoids appearing the condition that a plurality of acupuncture felts bond the use each other, the effectual result of use that has improved.
The invention is further configured to: the thickness of the thick felt is 50 mm-100 mm.
Through adopting above-mentioned technical scheme, the thickness of the thick felt through acupuncture circulation processing is 50mm ~ 100mm, can directly carbonize the thick felt of certain thickness according to the in-service use demand, has reduced artifical fixed time and the process of a plurality of acupuncture felt mutual adhesion, has improved the thermal-insulated result of use to super high temperature smelting furnace.
The invention is further configured to: the felt net base layer and the felt layer to be needled are composite needled felt layers, and the composite needled felt layers comprise high-temperature-resistant needled felt layers, corrosion-resistant base cloth layers and acid and alkali resistant needled felt layers which are sequentially connected in a needling mode from top to bottom.
Through adopting above-mentioned technical scheme, because the smelting furnace is about 1300 ℃ in the temperature of smelting the in-process, adopt compound acupuncture felt layer that high temperature resistant acupuncture felt layer, corrosion-resistant base cloth layer and acid and alkali resistance acupuncture felt layer combination formed, have high temperature resistant, corrosion-resistant, acid and alkali resistance's performance, because thick felt is connected by a plurality of compound acupuncture felt layer acupuncture and is formed, and then strengthened the result of use of thick felt to satisfy the thermal-insulated to ultra-high temperature smelting furnace.
The invention is further configured to: the high-temperature-resistant needled felt layer is formed by carding first warps and first wefts, wherein the first warps are PBO fibers, and the first wefts are graphite fibers.
By adopting the technical scheme, the PBO fiber has the characteristics of high strength, high heat resistance and high flame retardancy, and the heat-resistant temperature of the PBO fiber can reach 600 ℃; the graphite fiber has the characteristics of high strength, good thermal shock resistance and small thermal expansion coefficient, can resist 3500 ℃ in an oxygen-free environment, and has excellent flame resistance, electrical conductivity and corrosion resistance; the PBO fiber and the graphite fiber are combed into the reticular fiber thin felt by utilizing the fiber carding machine, and finally the high-temperature resistant needled felt can be obtained, so that the composite needled felt has the advantage of high temperature resistance, and the heat insulation effect of the thick felt on a smelting furnace is enhanced.
The invention is further configured to: the corrosion-resistant base cloth layer is a filter base cloth formed by carding second warps and second wefts into a net, the second wefts are basalt fibers, the second warps are corrosion-resistant composite fibers, and the corrosion-resistant composite fibers are spun by using fiber polyimide fibers and polyester fibers.
By adopting the technical scheme, the polyester fiber has the characteristics of high modulus, high strength, good heat resistance and the like, but the polyester fiber is heated, melted, decomposed and combusted, so that the phenomenon of molten drop dripping is caused; the polyimide fiber has the advantages of high and low temperature resistance, good flame retardance and no dripping, is self-extinguished after being away from fire, and has excellent heat insulation performance; the polyester fiber and the polyimide fiber are mixed to be used as the second warp, so that the second warp has the advantages of high strength, good flame retardant property and no molten drop; the basalt fiber as the second weft has the performances of electric insulation, high temperature resistance, corrosion resistance and the like.
The second warp and the second weft are carded and spun by using a fiber carding machine, so that the corrosion-resistant base fabric layer has the advantages of corrosion resistance, high temperature resistance and high strength; because the smelting process, smelting furnace high temperature and the stove in have gaseous corrosion, the setting of corrosion-resistant base cloth layer can avoid thick felt when thermal-insulated to the smelting furnace, the phenomenon that corrodes, damages appears, has further strengthened the chemical stability performance of compound acupuncture felt layer to thick felt result of use has been improved.
The invention is further configured to: the acid and alkali resistant needled felt layer is formed by carding third warps and third wefts into a net, wherein the third warps and the third wefts are acid and alkali resistant composite fibers, and the acid and alkali resistant composite fibers are formed by spinning high-tenacity viscose fibers and polytetrafluoroethylene fibers.
By adopting the technical scheme, the high-tenacity fiber has the advantages of high viscosity and good alkali resistance; the polytetrafluoroethylene fiber has the advantages of high strength, good chemical stability and good corrosion resistance, and the polytetrafluoroethylene fiber fabric can be used as a filter material for corrosive gas, acid and alkali fog drops at high temperature, and then acid and alkali resistant composite fibers are respectively used as third warp and third weft and are carded into a reticular fiber thin felt through a fiber carding machine, so that the acid and alkali resistant needled felt layer has the characteristics of high strength and good acid and alkali resistance.
When special strong acid and alkali liquid exists in the smelting furnace, corrosive gas containing acid, alkali and the like can be emitted, and the acid and alkali resistant needled felt layer has good acid and alkali resistance, so that the chemical stability of the composite needled felt layer is enhanced, and the strength and the using effect of the thick felt are effectively improved.
The invention also aims to provide a processing technology of the circulating needling type thick felt, which can realize the processing of the thick felt.
A processing technology of a circulating needling thick felt comprises the following steps:
step S1: preparing a felt net base layer and a felt layer to be needled in advance;
step S2: winding the felt net base layer between two supporting rollers, and connecting the head end and the tail end of the felt net base layer in a needling manner by adopting a needling process;
step S3: adopting a needling process to connect the starting end of the felt layer to be needled with the surface of the felt net base layer in a needling way;
step S4: and rotating the supporting roller, and continuously needling by adopting a needling process until the needled thick felt with the required thickness is achieved.
By adopting the technical scheme, firstly, the felt net base layer is wound between two supporting rollers, and the head end and the tail end of the felt net base layer are connected by a needle machine; secondly, the starting end of the felt layer to be needled is connected to the surface of the felt net base layer in a needling manner; then the two supporting rollers are rotated, the felt net base layer circularly moves along the rolling direction of the supporting rollers through the feeding force of the supporting rollers, and then the felt layer to be needled and the felt net base layer are driven to synchronously move, so that the continuous feeding of the felt layer to be needled is realized; the continuous needling work of the needle machine is carried out while the felt layer to be needled is fed, so that the felt layer to be needled can be circularly needled and connected on the felt net base layer, and the thick felt with the required thickness can be achieved.
The felt layer to be needled is circularly fed, so that the needling machine is always used for needling and connecting the felt layer to be needled within a certain depth range during needling, and the phenomena of fiber damage and needle damage caused by repeatedly needling the lower felt layer to be needled beyond the needling range during needling can be avoided, so that the needle effect is reduced, and the strength of the thick felt is influenced; the thick felt produced by the processing technology can be used for producing thick felts with high thickness, and felting needles are not needed to directly penetrate through the thick felt with the required thickness, so that the strength of the product is improved, and the use requirement is met.
The invention is further configured to: and a linen roll layer with a rough surface is wound on the circumferential outer wall of the supporting roller in the step S2, and after the head end and the tail end of the felt net base layer are connected in a needling mode, the inner ring wall of the felt net base layer is abutted against the outer surface of the linen roll layer.
By adopting the technical scheme, when the felt base layer is conveyed, because the supporting roller is a smooth surface and the friction force between the supporting roller and the felt base layer is small, the feeding force is difficult to provide for the felt base layer, and the felt base layer does not rotate circularly; through setting up the coarse linen cloth roll layer in surface, linen cloth roll layer contacts with the interior rampart of felt-net basic unit, and then has increased frictional force between the two, conveying felt-net basic unit that can be stable to realize circulation acupuncture processing, improved acupuncture efficiency.
The invention is further configured to: the needling density in the step S4 is 120-180 needles/cm2And the linear speed of the supporting roller is 3-6 m/min.
By adopting the technical scheme, if the needling density is less than 120 needles/cm2The needling density is too low, so that the strength of the thick felt is reduced; if the needling density is more than 180 needles/cm2Excessive needling density is easy to occur, resulting inFiber damage, product strength reduction, even breakage of the needle, and therefore the needle punching density is set to be 120-180 needles/cm2So as to obtain good needling effect and improve the strength of the thick felt according to the requirements specified by product performance.
The rolling speed of the supporting roller is in direct proportion to the needling speed, the needling speed can be controlled by setting the rolling speed of the supporting roller, and if the linear speed of the supporting roller is less than 3m/min, the needling speed is too low, and the needling efficiency is too low; if the linear velocity of the supporting roller is larger than 6m/min, and then the needling speed is too high, the phenomenon of needle breakage easily occurs, the needling speed is controlled by setting the linear velocity of the supporting roller to be 3-6 m/min, so that the felt layer to be needled can be stably connected on the felt net base layer, and the stability of the processing process is improved.
The invention is further configured to: still include the support that is used for the bearing backing roll in the step S4, just be located to rotate between two backing rolls on the support and be equipped with a plurality of guide rolls, the axial of guide roll and the axial syntropy of backing roll.
Through adopting above-mentioned technical scheme, the setting of guide roll plays direction and bearing effect to the conveying of felt net basic unit, avoids when the interval is too big between two backing rolls, and the thickness of the thick felt of processing still when less, leads to thick felt weight lighter and drops to ground, has influenced the stability of data send process.
In conclusion, the beneficial technical effects of the invention are as follows:
1. by adopting a circulating needling mode, the felting needles can circularly wind and wrap the felt layer to be needled on the surface of the felt net base layer within a certain range, and the felting needles are not required to directly penetrate through the thick felt with the required thickness, so that the thick felt with the required thickness can be achieved, the strength of the thick felt is improved, and the use requirement is met;
2. the thick felt is 50 mm-100 mm in thickness, can be used for heat insulation protection of the ultra-high temperature smelting furnace, does not need to adhere a plurality of needled felts to each other, and improves the use effect;
3. setting the needling density to be 20-180 needles/cm2Can avoid the phenomenon of fiber damage or product strength reduction caused by overlarge needling density, and is effectiveThe strength of the thick felt is improved;
4. the rolling speed of the supporting roller is in direct proportion to the needling speed, and the linear speed of the supporting roller is set to be 3-6 m/min, so that the phenomena that the needling speed is too high and the felting needles are broken can be avoided, and the stability of the needling process is improved;
5. when special strong alkaline-acid liquid is in the smelting furnace, corrosive gas containing acid and alkali is easily emitted due to high temperature in the furnace, the composite needled felt layer has the characteristics of high temperature resistance, corrosion resistance and acid and alkali resistance, and the thick felt is needled and formed by a plurality of layers of composite needled felts, so that the using effect of the thick felt is effectively improved, and the service life of the thick felt is prolonged.
Drawings
FIG. 1 is a schematic view showing the positional relationship between a felt base layer and a layer to be needle-punched and bonded in accordance with one embodiment.
Fig. 2 is a schematic diagram showing a specific structure of the composite needle-punched adhesive layer.
Fig. 3 is a schematic view showing the positional relationship between the felt base layer and the support roll in the second embodiment.
Reference numerals: 1. a felt base layer; 2. a felt layer is to be needled; 3. a composite needled felt layer; 31. a high temperature resistant needled felt layer; 32. a corrosion-resistant base cloth layer; 33. acid and alkali resistant needled felt layer; 4. a support roller; 5. a linen cloth winding layer; 6. a support; 7. and a guide roller.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
referring to fig. 1, the circular needling thick felt disclosed by the invention comprises a felt net base layer 1 and a felt layer 2 to be needled, which have the same thickness, wherein the felt layer 2 to be needled is circularly needled and connected to the surface of the felt net base layer 1 by using a needling machine, and then when needling is carried out, felts to the felt layer 2 to be needled, which has the number of layers within a certain range, are always needled, so that the felts with the required thickness are prevented from being directly punctured by the felts, the needling effect is enhanced, and the strength of the thick felt is improved.
In the embodiment, a circular needling mode is adopted, the thick felt with the required thickness can be achieved, the thickness range of the thick felt is preferably 50-100 mm, and then when the ultra-high temperature smelting furnace needs to be insulated, the mutual bonding use of a plurality of needled felts is avoided, and the use effect is improved.
Referring to fig. 1 and 2, the felt net base layer 1 and the felt layer 2 to be needled are both a composite needled felt layer 3, the composite needled felt layer 3 comprises a corrosion-resistant base fabric layer 32, the upper surface and the lower surface which are tightly attached to the corrosion-resistant base fabric layer 32 are respectively in needled connection with a high-temperature resistant needled felt layer 31 and an acid and alkali resistant needled felt layer 33, and the corrosion-resistant base fabric layer 32, the high-temperature resistant needled felt layer 31 and the acid and alkali resistant needled felt layer 33 are all net-shaped fiber felts.
When the heat insulation of the ultra-high temperature smelting furnace is needed, due to the fact that special strong acid and alkali liquid exists in the furnace, corrosive gas containing acid and alkali is easily emitted, the high-temperature-resistant needled felt layer 31, the corrosion-resistant base cloth layer 32 and the acid and alkali-resistant needled felt layer 33 are connected through needling, the composite needled felt layer 3 has good high-temperature resistance, corrosion resistance and acid and alkali resistance, therefore, thick felt formed by needling a plurality of layers of the composite needled felt layer 3 has good heat insulation effect and chemical stability, and the service life of the thick felt is prolonged.
Referring to fig. 2, the high temperature resistant needled felt layer 31 is made into a reticular fiber thin felt by carding and spinning first warp and first weft through a fiber carding machine, the first warp is PBO fiber, the first weft is graphite fiber, the PBO fiber has the characteristics of high strength, high heat resistance and high flame retardancy, and the heat resistance temperature of the PBO fiber can reach 600 ℃; the graphite fiber has the characteristics of high strength, good thermal shock resistance and small thermal expansion coefficient, can resist 3500 ℃ in an oxygen-free environment, and has excellent flame resistance, electrical conductivity and corrosion resistance; high temperature resistant acupuncture felt layer 31's setting, the effectual intensity and the high temperature resistance who strengthens compound acupuncture felt layer 3 to thick felt can insulate against heat to ultra-high temperature's smelting furnace, excellent in use effect.
Referring to fig. 2, the corrosion-resistant base cloth layer 32 is a filter base cloth formed by carding and spinning second warps and second wefts through a fiber carding machine, the second warps are corrosion-resistant composite fibers, the corrosion-resistant composite fibers are formed by spinning fiber polyimide fibers and polyester fibers, the second wefts are basalt fibers, and the basalt fibers have the properties of electrical insulation, high temperature resistance, corrosion resistance and the like; the polyimide fiber has the advantages of high and low temperature resistance, good flame retardance and no dripping, is self-extinguished after being away from fire, and has excellent heat insulation performance; the polyester fiber has the characteristics of high modulus, high strength, good heat resistance and the like, but the polyester fiber is heated, melted, decomposed and combusted, and has the phenomenon of dripping of molten drops, so that the polyester fiber and the polyimide fiber are mixed and spun to obtain the corrosion-resistant composite fiber with high strength, good flame retardant property and no molten drops; the corrosion-resistant base cloth layer 32 has the advantages of good high temperature resistance and corrosion resistance, the strength and the corrosion resistance of the composite needled felt layer 3 are further enhanced, and the using effect of the thick felt is improved.
Referring to fig. 2, the acid and alkali resistant needled felt layer 33 is formed by carding third warp and third weft into a reticular fiber thin felt through a fiber carding machine, the third warp and the third weft are both acid and alkali resistant composite fibers, the acid and alkali resistant composite fibers are formed by mixing and spinning strong fibers and polytetrafluoroethylene fibers, and the strong fibers have the advantages of high viscosity and good alkali resistance; the polytetrafluoroethylene fiber has the advantages of high strength, good chemical stability and good corrosion resistance, and the polytetrafluoroethylene fiber fabric can be used as a filter material for corrosive gas, acid and alkali fog drops at high temperature, so that the composite needled felt layer 3 spun by the acid and alkali resistant composite fiber has good acid and alkali resistance and prolongs the service life of thick felt.
Example two:
referring to fig. 3, a processing technology of a circulating needle-punched thick felt comprises the following steps:
step S1: preparing a felt net base layer 1 and a felt layer 2 to be needled in advance, wherein the felt layer 2 to be needled is wound on a traction frame in a roll shape;
step S2: winding the felt net base layer 1 between the two supporting rollers 4, and then needling the head end and the tail end of the felt net base layer 1 by using a needle machine to ensure that the felt net base layer 1 is annular and is wound and coated on the two supporting rollers 4;
step S3: the starting end of the felt layer 2 to be needled is connected with the surface of the felt net base layer 1 by needling by a needle machine;
step S4: the supporting roll 4 is rotated, the supporting roll 4 provides a feeding force to the felt base layer 1,setting the linear velocity of the supporting rollers 4 to be 3-6 m/min, circularly rotating the felt net base layer 1 around the two supporting rollers 4, continuously needling by using a needling machine after the needled felt layer 2 synchronously moves along with the felt net base layer 1, and setting the needling density of the needling machine to be 120-180 needles/cm2The method realizes the circular needling of the felt layer 2 to be needled on the surface of the felt net base layer 1 until reaching the needling thick felt with the required thickness.
During needling, the support rollers 4 are driven to rotate by a power source to drive the felt net base layer 1 to circularly transmit on the two support rollers 4, and the starting end of the felt layer 2 to be needled is connected to the felt net base layer 1 in a needling manner, so that the felt layer 2 to be needled and the felt net base layer 1 are driven to synchronously move; treat that acupuncture felt layer 2 circulation acupuncture is connected behind the upper surface of felt-net base layer 1 when the one deck, owing to take acupuncture felt layer lapping to set up, and then in the course of working, through the feed force of backing roll 4, realized treating that acupuncture felt layer 2 lasts the material loading, utilize the needle loom to last acupuncture simultaneously, finally reach the purpose of circulation acupuncture to process to the thick felt of required thickness.
The needling density of the needling machine is 120-180 needles/cm2If the needling density of the needling machine is less than 120 needles/cm2The needling density is easy to be too low, the strength of the thick felt is reduced, and if the needling density of the needling machine is more than 180 needles/cm2The phenomena of overlarge needling density, fiber damage and broken felting needles are easy to occur, so that the strength of the product is reduced; in this embodiment, the needling density of the needling machine is preferably 146 needles/cm2So that the needling density meets the performance requirements specified by the product, a good needling effect is obtained, and the strength of the thick felt is further enhanced.
The needling speed is in direct proportion to the rolling speed of the supporting roller 4, the linear speed of the supporting roller 4 is set to be 3-6 m/min, and if the linear speed of the supporting roller 4 is less than 3m/min, the needling speed is slow, so that the processing efficiency is low; if the linear speed of the supporting roller 4 is more than 6m/min, the needling speed is higher, so that the processing efficiency is overhigh, and the phenomenon of breaking the felting needles is easy to occur; in the embodiment, the linear speed of the supporting roller 4 is preferably 4.5m/min, so that the influence of too low or too high needling speed on the needling effect can be avoided, and the thick felt can be processed stably.
During needling, the felt layer 2 to be needled is circularly fed, and as the needling number is increased, the needling resistance is increased, so that fiber damage and felting needle damage are easily caused, the felting needle effect is influenced, and the strength of the thick felt is further reduced, in the embodiment, the needling depth of the needling machine is 1.5-15 mm, the preferred felting needle depth is 1.8 mm, the thickness of each felt layer 2 to be needled is 1 mm, and the needling machine always performs needling within the set needling depth range, so that the phenomenon that the lower needled felt layer is needled for many times during needling can be avoided, and the strength of the thick felt is improved; therefore, the thick felt produced by the processing technology can be used for producing thick felts with high thickness so as to meet the use requirement and has wide application range.
Referring to fig. 3, the linen roll layer 5 with a rough surface is wound on the outer circumferential wall of the supporting roller 4 in step S2, the lower surface of the felt base layer 1 is abutted against the outer surface of the linen roll layer 5, and the friction of the supporting roller 4 for conveying the felt base layer 1 is increased by the placement of the linen roll layer 5, so that the felt base layer 1 is conveyed circularly, the felt layer 2 to be needled can be connected to the upper surface of the felt base layer 1 in a circulating needling manner, and the needling efficiency is improved.
Referring to fig. 3, a bracket 6 is arranged between two support rollers 4, two ends of each support roller 4 are rotatably connected with the bracket 6, a plurality of guide rollers 7 are rotatably arranged on the bracket 6 and between the two support rollers 4, and the axial direction of each guide roller 7 is the same as that of each support roller 4; in the process of conveying the felt base layer 1, the lower surface of the felt base layer 1 is contacted with the peripheral wall of the guide roller 7, so that the stability of the conveying process is improved; meanwhile, the guide roller 7 has a bearing effect on the felt net base layer 1, and the condition that the weight of the thick felt is lighter and falls to the ground due to the fact that the distance between the two supporting rollers 4 is too large and the thickness of the needled thick felt is small, and the stability of the conveying process is influenced is avoided.
The implementation principle of the embodiment is as follows: firstly, winding a felt net base layer 1 between two supporting rollers 4, and needling the head end and the tail end of the supporting rollers 4 by using a needle machine; secondly, a needle machine is utilized to connect the starting end of the felt layer 2 to be needled to the upper surface of the felt net base layer 1 in a needling manner; then the two supporting rollers 4 are rotated, the felt net base layer 1 circularly moves along with the rolling of the two supporting rollers 4, and then the felt layer 2 to be needled and the felt net base layer 1 are driven to synchronously move; meanwhile, continuously needling the felt layer 2 to be needled by using a needling machine, and finally circularly needling the felt layer 2 to be needled on the felt net base layer 1 in cycles to finally obtain the thick felt with the required thickness.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. The utility model provides a thick felt of circulation acupuncture type which characterized in that: the felt comprises a felt net base layer (1) and a felt layer (2) to be needled, wherein the felt layer (2) to be needled is circularly wound and coated on the surface of the felt net base layer (1) by adopting a needling process until a thick felt with required thickness is reached, and the thickness of the thick felt is more than 50 mm.
2. The endless needle punched thick felt according to claim 1, wherein: the thickness of the thick felt is 50 mm-100 mm.
3. The endless needle punched thick felt according to claim 1, wherein: felt net basic unit (1) and treat that acupuncture felt layer (2) are compound acupuncture felt layer (3), compound acupuncture felt layer (3) are including high temperature resistant acupuncture felt layer (31), corrosion-resistant base cloth layer (32) and acid and alkali-resistance acupuncture felt layer (33) that from top to bottom connect gradually the acupuncture.
4. The endless needle punched thick felt according to claim 3, wherein: the high-temperature-resistant needled felt layer (31) is formed by carding first warps and first wefts, wherein the first warps are PBO fibers, and the first wefts are graphite fibers.
5. The endless needle punched thick felt according to claim 3, wherein: the corrosion-resistant base cloth layer (32) is a filter base cloth formed by carding second warps and second wefts into a net, the second wefts are basalt fibers, the second warps are corrosion-resistant composite fibers, and the corrosion-resistant composite fibers are spun by using fiber polyimide fibers and polyester fibers.
6. The endless needle punched thick felt according to claim 3, wherein: the acid and alkali resistant needled felt layer (33) is formed by carding third warps and third wefts into a net, wherein the third warps and the third wefts are acid and alkali resistant composite fibers, and the acid and alkali resistant composite fibers are formed by spinning high-tenacity viscose fibers and polytetrafluoroethylene fibers.
7. The process for manufacturing a circulating needle-punched thick felt according to any one of claims 1 to 6, comprising the following steps:
step S1: preparing a felt net base layer (1) and a felt layer (2) to be needled in advance;
step S2: winding the felt net base layer (1) between two supporting rollers (4), and connecting the head end and the tail end of the felt net base layer (1) in a needling manner by adopting a needling process;
step S3: adopting a needling process to connect the starting end of the felt layer (2) to be needled with the surface of the felt net base layer (1) in a needling way;
step S4: and (4) rotating the supporting roller, and continuously needling by adopting a needling process until the needled thick felt with the required thickness is achieved.
8. The process of claim 7, wherein the process comprises the following steps: and a linen material roll layer (5) with a rough surface is wound on the circumferential outer wall of the supporting roller (4) in the step S2, and after the head end and the tail end of the felt net base layer (1) are connected in a needling mode, the inner annular wall of the felt net base layer is abutted against the outer surface of the linen material roll layer (5).
9. The process of claim 7, wherein the process comprises the following steps: the needling density in the step S4 is 120-180 needles/cm2And the linear speed of the supporting roller (4) is 3-6 m/min.
10. The process of claim 7, wherein the process comprises the following steps: still including support (6) that are used for bearing backing roll (4) in the step S4, just be located to rotate between two backing rolls (4) on support (6) and be equipped with a plurality of guide rolls (7), the axial of guide roll (7) and the axial syntropy of backing roll (4).
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