CN113502582B

CN113502582B - Production method of fire-fighting flame-retardant yarn

Info

Publication number: CN113502582B
Application number: CN202110891150.6A
Authority: CN
Inventors: 高洪; 高伟良
Original assignee: Wuxi Gaoshikang New Material Technology Co ltd
Current assignee: Wuxi Gaoshikang New Material Technology Co ltd
Priority date: 2021-08-04
Filing date: 2021-08-04
Publication date: 2022-09-30
Anticipated expiration: 2041-08-04
Also published as: CN113502582A

Abstract

The invention discloses a production method of fire-fighting flame-retardant yarn, which divides the area of a disc of a plucker and arranges weighing devices in corresponding areas to realize the weighing and mixing of three fibers in the required proportion of a plucking process, and then directly realizes the accurate mixing proportion control of the three fibers in the plucking process, thereby effectively improving the mixing efficiency, simultaneously, two continuous cotton mixers are adopted to carry out the mixing under the time difference and the road difference of two continuous times in the cotton mixing process, thereby effectively improving the mixing effect, realizing the uniform mixing of the three fibers, a cotton carding process adopts a plurality of detection roller pairs to control to realize the uniform feeding of the thickness of a mixed fiber bundle, thereby effectively improving the carding effect, and a spun yarn vortex spinning frame is adopted to realize the preparation from a sliver to the spun yarn directly, thereby effectively improving the production efficiency of the spun yarn, and finally realizing the high-efficiency production of the fire-fighting flame-retardant yarn with high quality yarn-forming quality.

Description

Production method of fire-fighting flame-retardant yarn

Technical Field

The invention belongs to the technical field of spinning, and relates to a spinning method of novel yarns, in particular to a production method of fire-fighting flame-retardant yarns.

Background

In the prior art, various functional fibers are often single in performance, for example, bamboo charcoal fibers have excellent antibacterial performance, but have poor handfeel, skin-friendliness, cohesive force and spinnability, so that functional textiles with comprehensive performance need to be blended by multiple fibers, how to select different types and proportions of fibers to mix, and what spinning process is adopted to spin functional high-quality yarns with excellent performance, which is a problem to be solved urgently at present. With the enhancement of public fire safety awareness and the requirement of military adaptation to special environments, the flame-retardant fabric is increasingly applied to military training clothes, fire-fighting clothes, hotel and family decoration materials and export children clothes, and the comfort and the durability of the clothes are required to be improved on the basis of flame retardance.

Disclosure of Invention

The invention aims to provide a production method of fire-fighting flame-retardant yarn, which realizes weighing and mixing of three fibers in proportion in a cotton grabbing procedure by dividing a disc of a cotton grabbing machine into areas and arranging a weighing device in the divided areas, then realizes accurate control of the mixing proportion of the three fibers in the cotton grabbing procedure directly, thereby effectively improving the mixing efficiency, simultaneously adopting two continuous cotton mixing machines to carry out the mixing under the time difference and the route difference of two continuous times in the cotton mixing process, thereby effectively improving the mixing effect, realizing the uniform mixing of the three fibers, realizing the uniform feeding of the mixed fiber bundle thickness by adopting a plurality of detection roller pairs for control in the cotton carding process, thereby effectively improving the carding effect, the spun yarn adopts an eddy current spinning frame to realize the preparation from sliver to spun yarn directly, thereby effectively improving the production efficiency of spun yarn and finally realizing the high-efficiency production of the fire-fighting flame-retardant yarn with high-quality finished yarn quality.

The technical scheme is as follows: a production method of fire-fighting flame-retardant yarn comprises the steps of placing flame-retardant modacrylic fiber, viscose fiber and flame-retardant polyester fiber in a disc type plucker according to a mixing proportion, arranging a first weighing device, a second weighing device and a third weighing device at the bottom of a disc of the disc plucker, dividing the three weighing devices into three arc-shaped areas by 3 insertion type partition plates, weighing the three weighing devices in each spinning according to the fiber amount required in each spinning and the blending proportion of the three fibers, putting the three fibers in the disc plucker according to the weighing arrangement, drawing out the partition plates and vibrating the disc after putting, thus realizing the highly consistent discharge of the three fibers in the disc, then rotating a plucking beater along the axial direction of the disc, sucking one layer of fibers on the inner surface of the disc into a plucking tower through negative pressure in the rotating process, the cotton picking machine is characterized in that a single beater rotates in sequence in the cotton picking tower to freely beat and open, and a double beater rotates to freely tear and open, so that sucked mixed fibers are fully opened, and the opened mixed fibers are driven by negative pressure to enter a cotton mixing machine through a corresponding conveying pipeline; the cotton mixing machine comprises a rear cotton mixing machine comprising 4 high cotton bins and a front cotton mixing machine comprising 4 high cotton bins, rear fiber inlets are respectively arranged on rear fiber inlet pipes which are positioned right above the 4 high cotton bins of the rear cotton mixing machine, rear fiber stripping roller pairs are arranged at the bottom ends of the 4 high cotton bins of the rear cotton mixing machine, a horizontal fiber conveying mixed curtain which rotates in a reciprocating manner in a circulating manner is arranged right below the 4 high cotton bins, a rear fiber mixing box is arranged right in front of the fiber conveying mixed curtain, a rear cotton mixing machine fiber conveying pipe is arranged at the bottom of the rear fiber mixing box, forward fiber inlets which are always in an open state are respectively arranged on the forward fiber inlet pipes which are positioned right above the 4 high cotton bins of the front cotton mixing machine, front fiber stripping roller pairs are arranged at the bottom ends of the 4 high cotton bins of the front cotton mixing machine, 90-degree bent pipes are respectively arranged right below the 4 high cotton bins, the other ends of the bent pipes are kept in vertical alignment, oblique upward circulating rotation in a circulating manner and uniformly arranged on the bent pipes, and grabbing pins are uniformly arranged at the other ends of the bent pipes, the other ends of the bent pipes are kept in vertical alignment, and the bent pipes are in vertical alignment, and the upward circulating manner The fiber curtain is provided with a front fiber mixing box right in front of the fiber grabbing curtain, the bottom of the front fiber mixing box is provided with a fiber conveying pipe of a front cotton mixing machine, the mixed fibers grabbed by the cotton grabbing machine enter a rear cotton mixing machine, at the moment, rear fiber openings on the rear fiber pipes are sequentially opened from back to front, so that the mixed fibers are sequentially and gradually increased in height and are input into each cotton bin, the differential time input of the fibers in each cotton bin is realized, the rear fiber stripping roller pairs at the bottoms of the high cotton bins after the initial conveying are simultaneously started to work, the fibers in the high cotton bins are relatively torn and opened and then are stripped and fall onto the fiber conveying mixed curtain, the rear fiber openings on the rear fiber pipes are continuously and sequentially opened from back to front in the working process of the rear fiber stripping roller pairs, the differential time continuous input of the fibers in each cotton bin is realized, and the fiber conveying mixed curtain is circularly and repeatedly rotated, so that the falling fibers of each high cotton bin are superposed on the fiber conveying mixed curtain along the height direction to realize the effective mixing of three fibers, the fiber conveying mixed curtain drives the fibers to continuously fall into the rear fiber mixing box to realize the uniform mixing of the three fibers, the fibers in the rear fiber mixing box are conveyed into the front cotton mixing machine through the fiber conveying pipe of the rear cotton mixing machine, the fiber advancing opening on the fiber advancing pipe is always opened at the moment, so that the mixed fibers are simultaneously input into each cotton bin, when the height of the mixed fiber layer in each cotton bin reaches a set value, the front fiber stripping rollers at the bottom of each high cotton bin start working, so that the fibers in each high cotton bin are relatively torn and loosened and then stripped to fall into the corresponding bent pipe, the fibers are vertically aligned and output at the other end after the fibers are conveyed by different paths of each bent pipe to obtain the mixed fiber layer of a transverse layer, and then the effective mixing of the three fibers is realized, the mixed fiber layer is then grabbed by the grabbing fiber curtain along the thickness direction simultaneously, then the effective mixing of the three fibers is realized again in the longitudinal grabbing, the fiber is continuously driven by the grabbing fiber curtain to fall into the front mixed fiber box, so that the uniform mixing of the three fibers is realized, the fibers in the front mixed fiber box are sent into the carding machine through a fiber conveying pipe of a front cotton mixing machine, the mixed fiber bundle in the carding machine is firstly fed in a control mode through a detection roller pair comprising 6-10 upper detection rollers and corresponding lower supporting rollers, then the holding feeding is controlled through a feeding control mode comprising an upper feeding roller and a lower feeding plate, the pressure reaction of the upper detection roller to the pressed mixed fiber bundle with the corresponding width is detected in the process, the thickness of the mixed fiber bundle with the width is indirectly obtained, the rotating speed of the detection roller pair is controlled according to the detected thickness, and then the uniform feeding of the mixed fiber bundle is realized, the fed mixed fiber bundle is beaten and loosened by the licker-in rotating in front under the holding of the cotton feeding control pair, the loosening of the mixed fiber bundle is realized in the beating, the complete transfer of the mixed fiber from the cotton feeding control pair to the licker-in is realized, the gradual thinning of the mixed fiber is realized in the transfer due to the fact that the feeding speed is lower than the speed of the licker-in, the loosening effect is enhanced, the mixed fiber transferred to the licker-in is completely stripped by the large-diameter cylinder next to the mixed fiber, the mixed fiber transferred to the cylinder is driven by the cylinder to sequentially enter a rear carding area between the cylinder and a rear fixed cover plate next to the cylinder, a middle carding area between the cylinder and a middle movable cover plate next to the cylinder, and a front carding area between the cylinder and a front fixed cover plate next to the cylinder, so that the loosening carding of the fiber is performed in the rear carding area, the single-fiber carding and carding in the middle carding area are performed in sequence, Further straightening and carding the fibers in the front carding area, transferring and condensing the carded mixed fibers into a mixed fiber web by a doffer part with small diameter, and gathering the mixed fibers into a mixed fiber strip through a bell mouth; the mixed fiber sliver is subjected to three-path sliver finishing to realize uniform finishing of linear density and more uniform and fine mixing of three fibers so as to obtain a corresponding mixed fiber sliver, the first path sliver finishing adopts small back-region linear drafting and large front-region linear drafting to realize the main removing effect of a front hook, the second path sliver finishing adopts large back-region linear drafting and small front-region linear drafting to realize the main removing effect of a rear hook, the third path sliver finishing adopts back-region curve drafting and front-region curve drafting to realize the complete straightening effect of a hook, the mixed fiber sliver is directly prepared into fire-fighting flame-retardant yarn through an eddy spinning frame, the mixed fiber sliver is subjected to large extraction drafting through a drafting system consisting of four rows of rollers in the process to obtain mixed fiber slivers with regular length and small cohesive force among the fibers, and the head end diameters of the fibers enter a hollow spindle to form a yarn core under the condition of weak twist or even no twist, and the fiber tail end falls down on the surface of the hollow ingot under the action of airflow and rotates under the action of vortex airflow, and the fiber tail end is continuously wrapped on the core part along with the continuous output and driving of the yarn so as to form outer wrapping fiber, and then the required fire-fighting flame-retardant yarn is obtained.

Preferably, the method comprises the following specific steps: step one, fiber forming: sequentially grabbing cotton by a disc, mixing cotton by a rear cotton mixer, mixing cotton by a front cotton mixer and carding cotton by a front cotton mixer to prepare a mixed fiber strip, wherein the disc is mutually connected with the flame-retardant modacrylic fiber, the viscose fiber and the flame-retardant polyester fiber through fiber conveying pipelines;

the disc type bale plucker is adopted in the disc type bale plucker, the bale plucker comprises a disc for containing fibers, the disc is of a circular structure, the upper side surface of the disc is completely opened, a first weighing device, a second weighing device and a third weighing device which are of a fan-shaped structure are respectively arranged on the lower side surface of the disc, the fan-shaped areas of the lower side surface of the disc occupied by the first weighing device, the second weighing device and the third weighing device are the same or different, the first weighing device, the second weighing device and the third weighing device are integrally fixed on the lower side surface of the disc, a first embedding groove is arranged in the height direction of the disc between the first weighing device and the second weighing device, a first partition plate is inserted into the first embedding groove, a second embedding groove is arranged in the height direction of the disc between the second weighing device and the third weighing device, a second partition plate is inserted into the second embedding groove, a third embedded groove is arranged in the height direction of a disc between a third weighing device and the first weighing device, a third clapboard is inserted in the third embedded groove, a support column is arranged at the central part of the disc, a cotton grabbing beater is arranged at one side of the support column, an upward fiber conveying pipe is arranged above the support column, the cotton grabbing beater and the upward fiber conveying pipe are connected in an intercommunicating way, the cotton grabbing beater is driven by a transmission mechanism to rotate along the disc and move up and down along the height direction of the disc, the cotton grabbing beater comprises a cotton grabbing tower which is of a hollow trapezoidal structure, the upper side surface and the lower side surface of the cotton grabbing tower are both open, the upper side surface of the cotton grabbing tower is in intercommunicating connection with the upward fiber conveying pipe through corresponding pipelines, a fiber suction fan is arranged at the connection part of the cotton grabbing tower and the upward fiber conveying pipe, leveling rods are arranged at equal intervals on the lower side surface of the cotton grabbing tower, the leveling rod is connected with the lower side surface of the cotton grabbing tower through a bearing, so that the leveling rod can rotate freely, a leveling card clothing with a sawtooth structure is arranged on the leveling rod, a lower beater is arranged in the cotton grabbing tower and is of a single beater structure, a middle roller of the lower beater is connected to the inner side surface of the cotton grabbing tower through a bearing, a lower beater card clothing with a sawtooth structure is arranged on the middle roller of the lower beater, the lower beater is driven by a corresponding transmission mechanism to rotate, an upper beater is arranged in the cotton grabbing tower at the upper part of the lower beater and is of a double beater structure, a middle roller of the upper beater is connected to the inner side surface of the cotton grabbing tower through a bearing, an upper beater card clothing with an elastic angle nail structure is arranged on the middle roller of the upper beater, and the upper beater is driven by the corresponding transmission mechanism to rotate upwards together with mutually contacted parts in different directions; when the device is used, the first partition plate, the second partition plate and the third partition plate are respectively inserted into the first embedding groove, the second embedding groove and the third embedding groove to divide the disc into three parts, then the total fiber amount of the flame-retardant modacrylic fiber, the viscose fiber and the flame-retardant polyester fiber and the blending proportion required by the three fibers required during each spinning are obtained, the values required by the first weighing device, the second weighing device and the third weighing device are set according to the obtained data, then the corresponding flame-retardant modacrylic fiber, the viscose fiber and the flame-retardant polyester fiber are respectively put in, the putting is stopped when the put fiber amount reaches the value set by the weighing device, the first partition plate, the second partition plate and the third partition plate are pulled out after the putting of the three fibers is finished, and then the fiber suction fan, the lower beater are kept, The upper beater is all in a stop state, the corresponding transmission mechanism drives the cotton grabbing beater to rotate along the disc, so that the leveling rod on the lower side surface of the cotton grabbing tower contacts with the fibers which are put in at the moment and are highest in height, the high fibers move to the lower fibers under the driving of the leveling card clothing on the leveling rod, then the cotton grabbing beater continuously descends to achieve preliminary leveling of the three fibers which are put in, the transmission mechanism drives the disc to vibrate, further fine leveling of the three fibers which are preliminarily leveled in the disc is achieved, then the fiber sucking fan, the lower beater and the upper beater are all set to be in a working state, then the height of the cotton grabbing beater is set to enable the leveling rod on the lower side surface of the cotton grabbing tower to be in close pressing contact with the fibers after leveling, the cotton grabbing beater continues to rotate along the axial direction of the disc, a surface layer of fibers in the disc is sucked into the cotton grabbing tower through negative pressure in the rotating process, the sucked mixed fibers are firstly freely beaten and loosened by the lower beater card clothing on the rotating lower beater, and then the mixed fibers enter between the upper beaters, so that the mixed fibers are torn in a free state by the upper beater card clothing on the two upper beaters between the upper beaters, and the torn and loosened fibers are continuously conveyed upwards under the drive of the upper beaters rotating upwards in the same direction; the mixed fiber which is torn and opened is driven by negative pressure to enter a rear cotton mixing machine through a corresponding conveying pipeline, the rear cotton mixing machine comprises 4 high cotton bins, the high cotton bins are in a cuboid shape with an open upper side surface and an open lower side surface, rear fiber inlet pipes are arranged above the 4 high cotton bins of the rear cotton mixing machine and are communicated with a bale plucker, rear fiber inlet openings with controllable opening and closing states are respectively arranged at the bottoms of the rear fiber inlet pipes which are positioned right above the upper side surfaces of the high cotton bins, rear fiber stripping roller pairs are arranged in the lower side surfaces of the high cotton bins, rear fiber stripping card clothing is arranged on the rear fiber stripping roller pairs, the rear fiber stripping roller pairs are driven by corresponding transmission mechanisms to rotate in different directions but at the same speed, the mutual contact parts of the rear fiber stripping roller pairs are enabled to rotate downwards, a horizontal fiber conveying mixed curtain which rotates in a circulating and reciprocating manner is arranged right below the lower side surfaces of the 4 high cotton bins, a rear fiber mixing box is arranged right in front of the fiber conveying mixing curtain, a rear cotton mixing machine fiber conveying pipe is arranged at the bottom of the rear fiber mixing box, the mixed fibers grabbed by the cotton grabbing machine enter the rear cotton mixing machine, at the moment, a rear fiber opening on the rear fiber pipe is opened from back to front in sequence, so that the mixed fibers are sequentially and gradually increased in height and are input into the cotton bins, the fibers in the cotton bins are not input simultaneously, after the mixed fibers are initially conveyed by the high cotton bins, rear fiber stripping roller pairs at the bottoms of the high cotton bins start to work simultaneously, the fibers in the high cotton bins are torn and opened relatively, then are stripped and fall onto the fiber conveying mixing curtain, the rear fiber opening on the rear fiber pipe continues to be opened from back to front in sequence in the working process of the rear fiber stripping roller pairs, so that the continuous input of the fibers in the cotton bins is realized, and the fiber mixing curtain rotates back and forth along with the circulation of the fiber conveying mixing curtain, the front cotton mixing machine comprises 4 high cotton bins, a forward fiber pipe and a rear cotton mixing machine are connected with each other, forward fiber openings which are always in an open state are respectively arranged at the bottoms of the forward fiber pipes which are positioned right above the upper side surfaces of the high cotton bins, a front fiber stripping roller pair is arranged in the lower side surface of each high cotton bin, front fiber stripping card clothing is arranged on the front fiber stripping roller pair, the front fiber stripping roller pair is driven by a corresponding transmission mechanism to rotate in different directions but at the same speed, the mutual contact parts of the front fiber stripping roller pair keep downward rotation, and 90-degree bent pipes are respectively arranged right below the 4 high cotton bins, the other end of the elbow pipe keeps vertical alignment, a fiber grabbing curtain which is inclined to rotate upwards in a circulating and reciprocating mode and evenly arrayed with cotton grabbing brads is arranged at the vertical alignment end of the elbow pipe, a cotton homogenizing roller is arranged at the top end of the fiber grabbing curtain, cotton homogenizing card clothing is arranged on the cotton homogenizing roller, a front fiber mixing box is arranged right in front of the fiber grabbing curtain, a front cotton mixing machine fiber conveying pipe is arranged at the bottom of the front fiber mixing box, fibers in a rear fiber mixing box of a rear cotton mixing machine are conveyed into the front cotton mixing machine through the rear cotton mixing machine fiber conveying pipe, a forward fiber opening in the forward fiber pipe is always opened at the moment, so that the mixed fibers are simultaneously input into each high cotton bin, when the height of a mixed fiber layer in each high cotton bin reaches a set value, the front fiber stripping rollers at the bottom of each high cotton bin start to work, and the fibers in each high cotton bin are stripped and fall into the corresponding elbow pipe after being torn and opened, the other ends of the bent pipes are vertically aligned, so that the lengths of the bent pipes are different, the mixed fibers falling into the bent pipes are conveyed through different paths of the bent pipes and then are vertically aligned and output at the other ends of the bent pipes, a transversely-laid mixed fiber layer is obtained, effective mixing of the three fibers under different transmission paths is realized, the mixed fiber layer is simultaneously grabbed along the thickness direction by a grabbing fiber curtain, effective mixing of the three fibers is realized again in longitudinal grabbing, and the grabbing fiber curtain drives the fibers to continuously and uniformly fall into a front fiber mixing box under the action of a cotton homogenizing roller, so that uniform mixing of the three fibers is realized;

the fiber in the front fiber mixing box is sent into a carding machine through a fiber conveying pipe of the front fiber mixing machine, the carding machine sequentially comprises a feeding opening device, a free carding device, a condensation web forming device and a gathering and strip forming device from back to front along the motion direction of the fiber in the carding machine, the feeding opening device comprises a feeding device and an opening device, the feeding device comprises a detection roller pair positioned at the rear part and a cotton feeding control pair positioned at the front part, the number of the detection roller pairs is 6-10, the detection roller pair comprises an upper detection roller and a lower supporting roller, a pressure sensing device is arranged on the upper detection roller, each lower supporting roller is controlled by an independent motor in a transmission way, the cotton feeding control pair comprises an upper cotton feeding roller and a lower cotton feeding plate, the upper cotton feeding roller is driven by a corresponding transmission mechanism to rotate, the lower cotton feeding plate is an arc-shaped plate, and the pressure between the lower cotton feeding plate and the upper cotton feeding roller is increased from back to front and then reduced, the opening device comprises a licker-in, a licker-in opening card clothing is arranged on the licker-in, the licker-in is driven by a corresponding transmission mechanism to rotate, meanwhile, the rotating linear speed of the licker-in is greater than that of the cotton feeding roller, the free carding device comprises a large-diameter cylinder positioned at the lower part, a cylinder card clothing is arranged on the cylinder, the cylinder is driven by a corresponding transmission mechanism to rotate, a rear fixed cover plate, a middle movable cover plate and a front fixed cover plate are arranged above the cylinder, the rear fixed cover plate is a fixed structure, the inner side surface of the rear fixed cover plate is provided with the rear fixed card clothing, the middle movable cover plate is a movable structure which has a certain radian and rotates in a circulating reciprocating manner, the outward side surfaces of the middle movable cover plate are all provided with middle movable card clothing, the front fixed cover plate is a fixed structure, the inner side surface of the front fixed cover plate is provided with the front fixed card clothing, the coagulation net-forming device comprises a doffer with a small diameter, the doffer is driven by a corresponding transmission mechanism to rotate, the doffer is provided with condensing card clothing, a fiber stripping roller group is arranged above the front part of the doffer, the gathering and strip forming device comprises a gathering horn mouth, the front part of the gathering horn mouth is provided with a strip pressing device, the front part of the strip pressing device is provided with a winding can, a strip coiling device is arranged above the winding can, the bottom of the winding can is provided with a winding rotating disc, the winding can is driven by the winding rotating disc to rotate, when in use, a mixed fiber bundle entering the carding machine is fed in control by a detection roller pair in sequence and then is held by a cotton feeding control pair, the detection roller pair detects the reaction pressure of the pressed mixed fiber bundle with the corresponding width in the feeding process, so as to indirectly obtain the thickness of the mixed fiber bundle with the width, when the detected thickness of the mixed fiber bundle is equal to a preset value, the corresponding lower supporting roller is fed at a constant speed, so that a non-drafting effect under tension is generated between the corresponding detection roller pair and the cotton feeding control pair, the mixed fiber bundle with the width is fed normally, when the thickness of the detected mixed fiber bundle is larger than a preset value, the corresponding lower supporting roller is decelerated, so that a drafting effect is generated between the corresponding detection roller pair and the cotton feeding control pair, the thickness of the mixed fiber bundle with the width is reduced under the drafting effect, when the thickness of the detected mixed fiber bundle is smaller than the preset value, the corresponding lower supporting roller is accelerated, so that a stacking effect is generated between the corresponding detection roller pair and the cotton feeding control pair, the thickness of the mixed fiber bundle with the width is increased under the drafting effect, the uniform feeding of the mixed fiber bundle is realized, the uniformly fed mixed fiber bundle is beaten and loosened by the licker roller rotating forward under the holding of the cotton feeding control pair, the licker-in opening card clothing on the licker-in continuously impacts the fiber in the striking process, thereby realizing the opening of the fiber, simultaneously, the feeding speed of the mixed fiber bundle is less than the speed of the licker-in, thereby realizing the gradual thinning of the mixed fiber in the transfer, then the licker-in opening card clothing on the licker-in continuously and gradually pierces into the fiber of the mixed fiber bundle in the striking process, thereby realizing the holding and carding of the fiber, the mixed fiber is completely transferred to the licker-in by the cotton feeding control pair along with the continuous feeding of the mixed fiber bundle, the mixed fiber transferred to the licker-in then enters into the space between the licker-in and the cylinder, at the moment, the licker-in generates the outward pushing acting force and the inward pulling acting force of the cylinder to the mixed fiber on the licker-in by controlling the rotating speed and the steering of the licker-in and the configuration setting of the card clothing on the licker-in and the cylinder, so that the mixed fiber on the licker-in is completely transferred to the cylinder, the mixed fiber transferred to the cylinder is driven by the cylinder and then sequentially enters a rear carding area between the cylinder and a rear fixed cover plate close to the cylinder, a middle carding area between the cylinder and a middle movable cover plate close to the cylinder, and a front carding area between the cylinder and a front fixed cover plate close to the cylinder, in the rear carding area, because the separation degree between the fibers in the fiber bundle is small at the moment, the rotating cylinder card clothing generates a loosening effect on the fibers between the rotating cylinder card clothing and the static rear fixed card clothing in the process of driving the fibers to move, and then loosening carding is realized, in the middle carding area, the rotating cylinder card clothing and the rotating middle movable card clothing grab the fibers simultaneously, so that the fibers are repeatedly transferred between the rotating cylinder card clothing and the rotating middle movable card clothing, the carding effect on the fibers is realized, and then single fiber carding is realized, in the front carding area, because the separation degree between the fibers in the fiber bundle is large at the moment, the rotating cylinder card clothing generates straightening action on the fibers with the static front fixed card clothing in the process of driving the fibers to move, then straightening carding is realized, the carded mixed fibers are transferred and condensed into a mixed fiber web by a doffer part with small diameter, the mixed fiber web is completely stripped by a fiber stripping roller group and then gathered into mixed fiber strips through a gathering bell mouth, and the mixed fiber strips are continuously wound in a winding barrel after being finished by a mixed fiber strip layering device;

step two, strip finishing: the mixed fiber strips prepared in the first step are subjected to three-step strip finishing to realize uniform finishing of linear density and more uniform and fine mixing of three fibers, so that corresponding mixed fiber drawn strips are obtained; the first sliver finishing adopts small back area linear drafting and large front area linear drafting to realize the removing action of the front hook, at the moment, the hook at the front end of part of the fiber is changed from a completely bent state to a right angle or obtuse angle connection state with the fiber main body under the action of the small back area linear drafting, the hook at the front end of the fiber is changed to an obtuse angle or linear connection state with the fiber main body under the action of the large front area linear drafting, the second sliver finishing adopts the large back area linear drafting and the small front area linear drafting to realize the removing action of the back hook, at the moment, the hook at the back end of part of the fiber is changed from the completely bent state to an acute angle, right angle or obtuse angle connection state with the fiber main body under the action of the large back area linear drafting, and the hook at the back end of the fiber and the fiber main body are changed to a right angle, obtuse angle or linear connection state under the action of the small front area linear drafting, in the third sliver finishing, the back region curve drafting and the front region curve drafting are adopted to realize the complete straightening function of the hook, and at the moment, the fiber which is subjected to the preliminary bending finishing is completely straightened under the curve drafting function;

step three, whole sliver forming: the mixed fiber drawn sliver prepared in the second step is directly prepared into fire-fighting flame-retardant yarn through a vortex spinning frame, the mixed fiber drawn sliver in the process is greatly drawn and drafted through a drafting system consisting of four rows of rollers to obtain mixed fiber strands with orderly arranged length and small cohesive force among fibers, in the drafting process, the fed mixed fiber drawn sliver is drafted through a small back area to completely tension the fibers which are not tensioned in the sliver, the tensioned fibers slide mutually, the straightening degree of the fibers is further improved in the tensioning and sliding processes, the fiber strands in the tensioning state at a front jaw in a middle area are integrally drawn out from the fiber strands through the middle area drafting, so that the small drawing effect is realized, the fiber strands in the tensioning state at the front part of the front area are integrally drawn out from the fiber strands output by the middle area jaw through the front area drafting, thereby realize big extraction drafting action, the mixed fiber strand of fibers of draft system output makes fibrous head end directly enter into the core that forms the yarn in the hollow spindle under the condition of weak twist or zero twist, and the fibre tail end is owing to do not receive the twist degree effect, the fibre tail end is lodging and is rotatory under the effect of vortex air current on the surface of hollow spindle under the air current effect, thereby it forms the outsourcing fibre to constantly wrap on the core along with entering into the continuous output drive of the inside yarn of hollow spindle messenger's fibre tail end, thereby obtain fire control and use fire-retardant yarn then.

Has the advantages that: the invention divides the area of the disc of the plucker and arranges the weighing devices in the corresponding areas, thereby realizing the weighing and mixing of the three fibers in the plucking process in the required proportion, further directly realizing the accurate mixing proportion control of the three fibers in the plucking process, thereby effectively improving the mixing efficiency, simultaneously adopting two continuous cotton mixing machines to carry out the mixing under the time difference and the path difference of two continuous times in the cotton mixing procedure, thereby effectively improving the mixing effect, realizing the uniform mixing of the three fibers, realizing the uniform feeding of the mixed fiber bundle by controlling the carding process by adopting a plurality of detection roller pairs, thereby effectively improving the carding effect, the spun yarn adopts the vortex spinning frame to realize the preparation from sliver to spun yarn directly, thereby effectively improving the production efficiency of spun yarn and finally realizing the high-efficiency production of the fire-fighting flame-retardant yarn with high-quality finished yarn quality.

Detailed Description

The following examples further illustrate the present invention but are not to be construed as limiting the invention. Modifications and substitutions to methods, steps or conditions of the present invention may be made without departing from the spirit and scope of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.

Example 1

A production method of fire-fighting flame-retardant yarn comprises the steps of placing flame-retardant modacrylic fiber, viscose fiber and flame-retardant polyester fiber in a disc type plucker according to a mixing proportion, arranging a first weighing device, a second weighing device and a third weighing device at the bottom of a disc of the disc plucker, dividing the three weighing devices into three arc-shaped areas by 3 insertion type partition plates, weighing the three weighing devices in each spinning according to the fiber amount required in each spinning and the blending proportion of the three fibers, putting the three fibers in the disc plucker according to the weighing arrangement, drawing out the partition plates and vibrating the disc after putting, thus realizing the highly consistent discharge of the three fibers in the disc, then rotating a plucking beater along the axial direction of the disc, sucking one layer of fibers on the inner surface of the disc into a plucking tower through negative pressure in the rotating process, the cotton is freely beaten and opened by a single beater and freely torn and opened by a double rotary beater which rotate in sequence in the cotton grabbing tower, so that sucked mixed fibers are fully opened, and the opened mixed fibers are driven by negative pressure to enter a cotton mixing machine through a corresponding conveying pipeline; the cotton mixing machine adopts a rear cotton mixing machine comprising 4 high cotton bins and a front cotton mixing machine comprising 4 high cotton bins, rear fiber inlet ports are respectively arranged on rear fiber inlet pipes which are positioned right above the 4 high cotton bins of the rear cotton mixing machine, rear fiber stripping roller pairs are arranged at the bottom ends of the 4 high cotton bins of the rear cotton mixing machine, a horizontal fiber conveying and reciprocating rotating fiber conveying mixed curtain is arranged right below the 4 high cotton bins, a rear fiber mixing box is arranged right in front of the fiber conveying mixed curtain, a rear cotton mixing machine fiber conveying pipe is arranged at the bottom of the rear fiber mixing box, forward fiber inlet ports which are always in an open state are respectively arranged on the forward fiber inlet pipes which are positioned right above the 4 high cotton bins of the front cotton mixing machine, front fiber stripping roller pairs are arranged at the bottom ends of the 4 high cotton bins of the front cotton mixing machine, 90-degree bent pipes are respectively arranged right below the 4 high cotton bins, the other ends of the bent pipes are kept in vertical alignment, oblique upward reciprocating rotation and grabbing nails are evenly arranged on the bent pipes, and the upward reciprocating rotation are vertically aligned, and the grabbing nails are evenly arranged on the bent pipes The fiber curtain is provided with a front fiber mixing box right in front of the fiber grabbing curtain, the bottom of the front fiber mixing box is provided with a fiber conveying pipe of a front cotton mixing machine, the mixed fibers grabbed by the cotton grabbing machine enter a rear cotton mixing machine, at the moment, rear fiber openings on the rear fiber pipes are sequentially opened from back to front, so that the mixed fibers are sequentially and gradually increased in height and are input into each cotton bin, the differential time input of the fibers in each cotton bin is realized, the rear fiber stripping roller pairs at the bottoms of the high cotton bins after the initial conveying are simultaneously started to work, the fibers in the high cotton bins are relatively torn and opened and then are stripped and fall onto the fiber conveying mixed curtain, the rear fiber openings on the rear fiber pipes are continuously and sequentially opened from back to front in the working process of the rear fiber stripping roller pairs, the differential time continuous input of the fibers in each cotton bin is realized, and the fiber conveying mixed curtain is circularly and repeatedly rotated, so that the falling fibers of each high cotton bin are superposed on the fiber conveying mixed curtain along the height direction to realize the effective mixing of three fibers, the fiber conveying mixed curtain drives the fibers to continuously fall into the rear fiber mixing box to realize the uniform mixing of the three fibers, the fibers in the rear fiber mixing box are conveyed into the front cotton mixing machine through the fiber conveying pipe of the rear cotton mixing machine, the fiber advancing opening on the fiber advancing pipe is always opened at the moment, so that the mixed fibers are simultaneously input into each cotton bin, when the height of the mixed fiber layer in each cotton bin reaches a set value, the front fiber stripping rollers at the bottom of each high cotton bin start working, so that the fibers in each high cotton bin are relatively torn and loosened and then stripped to fall into the corresponding bent pipe, the fibers are vertically aligned and output at the other end after the fibers are conveyed by different paths of each bent pipe to obtain the mixed fiber layer of a transverse layer, and then the effective mixing of the three fibers is realized, the mixed fiber layer is then grabbed by the grabbing fiber curtain along the thickness direction simultaneously, then the effective mixing of the three fibers is realized again in the longitudinal grabbing, the fiber is continuously driven by the grabbing fiber curtain to fall into the front mixed fiber box, so that the uniform mixing of the three fibers is realized, the fibers in the front mixed fiber box are sent into the carding machine through a fiber conveying pipe of a front cotton mixing machine, the mixed fiber bundle in the carding machine is firstly fed in a control mode through a detection roller pair comprising 6-10 upper detection rollers and corresponding lower supporting rollers, then the holding feeding is controlled through a feeding control mode comprising an upper feeding roller and a lower feeding plate, the pressure reaction of the upper detection roller to the pressed mixed fiber bundle with the corresponding width is detected in the process, the thickness of the mixed fiber bundle with the width is indirectly obtained, the rotating speed of the detection roller pair is controlled according to the detected thickness, and then the uniform feeding of the mixed fiber bundle is realized, the fed mixed fiber bundle is beaten and loosened by the licker-in rotating in front under the holding of the cotton feeding control pair, the loosening of the mixed fiber bundle is realized in the beating, the complete transfer of the mixed fiber from the cotton feeding control pair to the licker-in is realized, the gradual thinning of the mixed fiber is realized in the transfer due to the fact that the feeding speed is lower than the speed of the licker-in, the loosening effect is enhanced, the mixed fiber transferred to the licker-in is completely stripped by the large-diameter cylinder next to the mixed fiber, the mixed fiber transferred to the cylinder is driven by the cylinder to sequentially enter a rear carding area between the cylinder and a rear fixed cover plate next to the cylinder, a middle carding area between the cylinder and a middle movable cover plate next to the cylinder, and a front carding area between the cylinder and a front fixed cover plate next to the cylinder, so that the loosening carding of the fiber is performed in the rear carding area, the single-fiber carding and carding in the middle carding area are performed in sequence, Further straightening and carding the fibers in the front carding area, transferring and condensing the carded mixed fibers into a mixed fiber web by a doffer part with small diameter, and gathering the mixed fibers into a mixed fiber strip through a bell mouth; the mixed fiber sliver is subjected to three-path sliver finishing to realize uniform finishing of linear density and more uniform and fine mixing of three fibers so as to obtain a corresponding mixed fiber drawn sliver, the first path sliver finishing adopts small back region linear drafting and large front region linear drafting to realize the main removing action of a front hook, the second path sliver finishing adopts large back region linear drafting and small front region linear drafting to realize the main removing action of a rear hook, the third path sliver finishing adopts back region curve drafting and front region curve drafting to realize the complete straightening action of a hook, the mixed fiber drawn sliver is directly prepared into fire-fighting flame-retardant yarn through a vortex spinning frame, the mixed fiber drawn sliver is subjected to large extraction drafting through a drafting system consisting of four rows of rollers so as to obtain mixed fiber strands with regularly arranged lengths and small cohesive force among the fibers, and the head end diameter of the fibers enters a hollow spindle to form a yarn core under the condition of weak twist or even no twist, and the fiber tail end falls down on the surface of the hollow ingot under the action of airflow and rotates under the action of vortex airflow, and the fiber tail end is continuously wrapped on the core part along with the continuous output drive of the yarn to form an outer wrapping fiber, so that the required fire-fighting flame-retardant yarn is obtained.

The method comprises the following specific steps: step one, fiber slivering: sequentially grabbing cotton by a disc, mixing cotton by a rear cotton mixer, mixing cotton by a front cotton mixer and carding cotton by a cotton carding machine to prepare mixed fiber strips, wherein the disc is mutually connected with the flame-retardant modacrylic fiber, the viscose fiber and the flame-retardant polyester fiber through fiber conveying pipelines;

the disc type bale plucker is adopted in the disc bale plucker and comprises a disc for containing fibers, the disc is of a circular structure, the upper side surface of the disc is completely opened, a first weighing device, a second weighing device and a third weighing device which are of a sector structure are respectively arranged on the lower side surface of the disc, the sector areas of the lower side surface of the disc occupied by the first weighing device, the second weighing device and the third weighing device are the same or different, the first weighing device, the second weighing device and the third weighing device are integrally fixed on the lower side surface of the disc, a first embedding groove is arranged in the height direction of the disc between the first weighing device and the second weighing device, a first partition plate is inserted into the first embedding groove, a second embedding groove is arranged in the height direction of the disc between the second weighing device and the third weighing device, a second partition plate is inserted into the second embedding groove, a third embedded groove is arranged in the height direction of a disc between a third weighing device and the first weighing device, a third clapboard is inserted in the third embedded groove, a support column is arranged at the central part of the disc, a cotton grabbing beater is arranged at one side of the support column, an upward fiber conveying pipe is arranged above the support column, the cotton grabbing beater and the upward fiber conveying pipe are connected in an intercommunicating way, the cotton grabbing beater is driven by a transmission mechanism to rotate along the disc and move up and down along the height direction of the disc, the cotton grabbing beater comprises a cotton grabbing tower which is of a hollow trapezoidal structure, the upper side surface and the lower side surface of the cotton grabbing tower are both open, the upper side surface of the cotton grabbing tower is in intercommunicating connection with the upward fiber conveying pipe through corresponding pipelines, a fiber suction fan is arranged at the connection part of the cotton grabbing tower and the upward fiber conveying pipe, leveling rods are arranged at equal intervals on the lower side surface of the cotton grabbing tower, the leveling rod is connected with the lower side surface of the cotton grabbing tower through a bearing, so that the leveling rod can rotate freely, a leveling card clothing with a sawtooth structure is arranged on the leveling rod, a lower beater is arranged in the cotton grabbing tower and is of a single beater structure, a middle roller of the lower beater is connected to the inner side surface of the cotton grabbing tower through a bearing, a lower beater card clothing with a sawtooth structure is arranged on the middle roller of the lower beater, the lower beater is driven by a corresponding transmission mechanism to rotate, an upper beater is arranged in the cotton grabbing tower at the upper part of the lower beater and is of a double beater structure, a middle roller of the upper beater is connected to the inner side surface of the cotton grabbing tower through a bearing, an upper beater card clothing with an elastic angle nail structure is arranged on the middle roller of the upper beater, and the upper beater is driven by the corresponding transmission mechanism to rotate upwards together with mutually contacted parts in different directions; when the device is used, the first partition plate, the second partition plate and the third partition plate are respectively inserted into the first embedding groove, the second embedding groove and the third embedding groove to divide the disc into three parts, then the total fiber amount of the flame-retardant modacrylic fiber, the viscose fiber and the flame-retardant polyester fiber and the blending proportion required by the three fibers required during each spinning are obtained, the values required by the first weighing device, the second weighing device and the third weighing device are set according to the obtained data, then the corresponding flame-retardant modacrylic fiber, the viscose fiber and the flame-retardant polyester fiber are respectively put in, the putting is stopped when the put fiber amount reaches the value set by the weighing device, the first partition plate, the second partition plate and the third partition plate are pulled out after the putting of the three fibers is finished, and then the fiber suction fan, the lower beater are kept, The upper beater is all in a stop state, the corresponding transmission mechanism drives the cotton grabbing beater to rotate along the disc, so that the leveling rod on the lower side surface of the cotton grabbing tower is contacted with the fibers which are thrown in at the moment and have the highest height, the high fibers are moved to the lower fibers under the driving of the leveling card clothing on the leveling rod, then the cotton grabbing beater continuously descends to realize the preliminary leveling of the three fibers which are thrown in, the transmission mechanism drives the disc to vibrate, so that the three fibers which are preliminarily leveled in the disc are further finely leveled, then the fiber suction fan, the lower beater and the upper beater are all set to be in a working state, the height of the cotton grabbing beater is set to be a state that the leveling rod on the lower side surface of the cotton grabbing tower is in close pressing contact with the fibers after leveling, the cotton grabbing beater continuously rotates along the axial direction of the disc, and a layer of fibers on the surface in the disc are sucked into the cotton grabbing tower through negative pressure in the rotating process, the sucked mixed fibers are firstly freely beaten and loosened by the card clothing of the lower beater on the rotating lower beater, and then the mixed fibers enter the space between the upper beaters, so that the card clothing of the upper beaters on the two upper beaters can be freely torn between the upper beaters, the tearing and loosening are realized, and meanwhile, the mixed fibers are continuously conveyed upwards under the drive of the upper beaters rotating upwards in the same direction; the mixed fiber which is torn and opened is driven by negative pressure to enter a rear cotton mixing machine through a corresponding conveying pipeline, the rear cotton mixing machine comprises 4 high cotton bins, the high cotton bins are in a cuboid shape with an open upper side surface and an open lower side surface, rear fiber inlet pipes are arranged above the 4 high cotton bins of the rear cotton mixing machine and are communicated with a bale plucker, rear fiber inlet openings with controllable opening and closing states are respectively arranged at the bottoms of the rear fiber inlet pipes which are positioned right above the upper side surfaces of the high cotton bins, rear fiber stripping roller pairs are arranged in the lower side surfaces of the high cotton bins, rear fiber stripping card clothing is arranged on the rear fiber stripping roller pairs, the rear fiber stripping roller pairs are driven by corresponding transmission mechanisms to rotate in different directions but at the same speed, the mutual contact parts of the rear fiber stripping roller pairs are enabled to rotate downwards, a horizontal fiber conveying mixed curtain which rotates in a circulating and reciprocating manner is arranged right below the lower side surfaces of the 4 high cotton bins, a rear fiber mixing box is arranged right in front of the fiber conveying mixing curtain, a rear cotton mixing machine fiber conveying pipe is arranged at the bottom of the rear fiber mixing box, the mixed fibers grabbed by the cotton grabbing machine enter the rear cotton mixing machine, at the moment, a rear fiber opening on the rear fiber pipe is opened from back to front in sequence, so that the mixed fibers are sequentially and gradually increased in height and are input into the cotton bins, the fibers in the cotton bins are not input simultaneously, after the mixed fibers are initially conveyed by the high cotton bins, rear fiber stripping roller pairs at the bottoms of the high cotton bins start to work simultaneously, the fibers in the high cotton bins are torn and opened relatively, then are stripped and fall onto the fiber conveying mixing curtain, the rear fiber opening on the rear fiber pipe continues to be opened from back to front in sequence in the working process of the rear fiber stripping roller pairs, so that the continuous input of the fibers in the cotton bins is realized, and the fiber mixing curtain rotates back and forth along with the circulation of the fiber conveying mixing curtain, the front cotton mixing machine comprises 4 high cotton bins, a forward fiber pipe and a rear cotton mixing machine are connected with each other, forward fiber openings which are always in an open state are respectively arranged at the bottoms of the forward fiber pipes which are positioned right above the upper side surfaces of the high cotton bins, a front fiber stripping roller pair is arranged in the lower side surface of each high cotton bin, front fiber stripping card clothing is arranged on the front fiber stripping roller pair, the front fiber stripping roller pair is driven by a corresponding transmission mechanism to rotate in different directions but at the same speed, the mutual contact parts of the front fiber stripping roller pair keep downward rotation, and 90-degree bent pipes are respectively arranged right below the 4 high cotton bins, the other end of the elbow pipe keeps vertical alignment, a fiber grabbing curtain which is inclined to rotate upwards in a circulating and reciprocating mode and evenly arrayed with cotton grabbing brads is arranged at the vertical alignment end of the elbow pipe, a cotton homogenizing roller is arranged at the top end of the fiber grabbing curtain, cotton homogenizing card clothing is arranged on the cotton homogenizing roller, a front fiber mixing box is arranged right in front of the fiber grabbing curtain, a front cotton mixing machine fiber conveying pipe is arranged at the bottom of the front fiber mixing box, fibers in a rear fiber mixing box of a rear cotton mixing machine are conveyed into the front cotton mixing machine through the rear cotton mixing machine fiber conveying pipe, a forward fiber opening in the forward fiber pipe is always opened at the moment, so that the mixed fibers are simultaneously input into each high cotton bin, when the height of a mixed fiber layer in each high cotton bin reaches a set value, the front fiber stripping rollers at the bottom of each high cotton bin start to work, and the fibers in each high cotton bin are stripped and fall into the corresponding elbow pipe after being torn and opened, the other ends of the bent pipes are vertically aligned, so that the lengths of the bent pipes are different, the mixed fibers falling into the bent pipes are conveyed through different paths of the bent pipes and then are vertically aligned and output at the other ends of the bent pipes, a transversely-laid mixed fiber layer is obtained, effective mixing of the three fibers under different transmission paths is realized, the mixed fiber layer is simultaneously grabbed along the thickness direction by a grabbing fiber curtain, effective mixing of the three fibers is realized again in longitudinal grabbing, and the grabbing fiber curtain drives the fibers to continuously and uniformly fall into a front fiber mixing box under the action of a cotton homogenizing roller, so that uniform mixing of the three fibers is realized;

the fiber in the front fiber mixing box is conveyed into the carding machine through a fiber conveying pipe of the front cotton mixing machine, the carding machine sequentially comprises a feeding opening device, a free carding device, a condensation web forming device and a gathering and strip forming device from back to front along the moving direction of the fiber in the carding machine, the feeding opening device comprises a feeding device and an opening device, the feeding device comprises a detection roller pair positioned at the rear part and a cotton feeding control pair positioned at the front part, the number of the detection roller pairs is 6-10, the detection roller pair comprises an upper detection roller and a lower supporting roller, a pressure sensing device is arranged on the upper detection roller, each lower supporting roller is controlled by independent motor transmission, the cotton feeding control pair comprises an upper cotton feeding roller and a lower cotton feeding plate, the upper cotton feeding roller is driven by a corresponding transmission mechanism to rotate, the lower cotton feeding plate is an arc-shaped plate, and the pressure between the lower cotton feeding plate and the upper cotton feeding roller is increased from back to front and then decreased, the opening device comprises a licker-in, a licker-in opening card clothing is arranged on the licker-in, the licker-in is driven by a corresponding transmission mechanism to rotate, meanwhile, the rotating linear speed of the licker-in is greater than that of the cotton feeding roller, the free carding device comprises a large-diameter cylinder positioned at the lower part, a cylinder card clothing is arranged on the cylinder, the cylinder is driven by a corresponding transmission mechanism to rotate, a rear fixed cover plate, a middle movable cover plate and a front fixed cover plate are arranged above the cylinder, the rear fixed cover plate is a fixed structure, the inner side surface of the rear fixed cover plate is provided with the rear fixed card clothing, the middle movable cover plate is a movable structure which has a certain radian and rotates in a circulating reciprocating manner, the outward side surfaces of the middle movable cover plate are all provided with middle movable card clothing, the front fixed cover plate is a fixed structure, the inner side surface of the front fixed cover plate is provided with the front fixed card clothing, the coagulation net-forming device comprises a doffer with a small diameter, the doffer is driven by a corresponding transmission mechanism to rotate, the doffer is provided with condensing card clothing, a fiber stripping roller set is arranged above the front of the doffer, the gathering and strip forming device comprises a gathering horn mouth, the front part of the gathering horn mouth is provided with a strip pressing device, the front part of the strip pressing device is provided with a winding can, a strip coiler is arranged above the winding can, the bottom of the winding can is provided with a winding rotating disc, the winding can is driven by the winding rotating disc to rotate, when in use, the mixed fiber bundle entering the carding machine is fed in control by a detection roller pair in sequence and then is held and fed by a cotton feeding control pair, the detection roller pair detects the reaction pressure of the pressed mixed fiber bundle with the corresponding width in the feeding control process, thereby indirectly obtaining the thickness of the mixed fiber bundle with the width, when the thickness of the detected mixed fiber bundle is equal to a preset value, the corresponding lower supporting roller is fed at a constant speed, so that a non-drafting effect under tension is generated between the corresponding detecting roller pair and the cotton feeding control pair, the mixed fiber bundle with the width is fed normally at the thickness, when the thickness of the detected mixed fiber bundle is greater than a preset value, the corresponding lower supporting roller is decelerated, so that a drafting effect is generated between the corresponding detecting roller pair and the cotton feeding control pair, the thickness of the mixed fiber bundle with the width is reduced under the drafting effect, when the thickness of the detected mixed fiber bundle is smaller than the preset value, the corresponding lower supporting roller is accelerated, so that a stacking effect is generated between the corresponding detecting roller pair and the cotton feeding control pair, the thickness of the mixed fiber bundle with the width is increased under the drafting effect, the uniform feeding of the mixed fiber bundle is realized, the uniformly fed mixed fiber bundle is subjected to the opening and striking of the licker-in rotating ahead under the holding of the cotton feeding control pair, the licker-in opening card clothing on the licker-in continuously impacts the fiber in the striking process, thereby realizing the opening of the fiber, simultaneously, the feeding speed of the mixed fiber bundle is less than the speed of the licker-in, thereby realizing the gradual thinning of the mixed fiber in the transfer, then the licker-in opening card clothing on the licker-in continuously and gradually pierces into the fiber of the mixed fiber bundle in the striking process, thereby realizing the holding and carding of the fiber, the mixed fiber is completely transferred to the licker-in by the cotton feeding control pair along with the continuous feeding of the mixed fiber bundle, the mixed fiber transferred to the licker-in then enters into the space between the licker-in and the cylinder, at the moment, the licker-in generates the outward pushing acting force and the inward pulling acting force of the cylinder to the mixed fiber on the licker-in by controlling the rotating speed and the steering of the licker-in and the configuration setting of the card clothing on the licker-in and the cylinder, so that the mixed fiber on the licker-in is completely transferred to the cylinder, the mixed fiber transferred to the cylinder is driven by the cylinder and then sequentially enters a rear carding area between the cylinder and a rear fixed cover plate close to the cylinder, a middle carding area between the cylinder and a middle movable cover plate close to the cylinder, and a front carding area between the cylinder and a front fixed cover plate close to the cylinder, in the rear carding area, because the separation degree between the fibers in the fiber bundle is small at the moment, the rotating cylinder card clothing generates a loosening effect on the fibers between the rotating cylinder card clothing and the stationary rear fixed card clothing in the process of driving the fibers to move, the loosening carding is realized, in the middle carding area, the rotating cylinder card clothing and the rotating middle movable card clothing grab the fibers simultaneously, the fibers are repeatedly transferred between the rotating cylinder card clothing and the rotating middle movable card clothing, the carding effect on the fibers is realized, and the single-fiber carding is realized, in the front carding area, because the separation degree between the fibers in the fiber bundle is large at the moment, the rotating cylinder card clothing generates straightening action on the fibers with the static front fixed card clothing in the process of driving the fibers to move, then straightening carding is realized, the carded mixed fibers are transferred and condensed into a mixed fiber web by a doffer part with small diameter, the mixed fiber web is completely stripped by a fiber stripping roller group and then gathered into mixed fiber strips through a gathering bell mouth, and the mixed fiber strips are continuously wound in a winding barrel after being finished by a mixed fiber strip layering device;

step three, whole sliver forming: the mixed fiber drawn sliver prepared in the second step is directly prepared into fire-fighting flame-retardant yarn through a vortex spinning frame, the mixed fiber drawn sliver in the process is greatly drawn and drafted through a drafting system consisting of four rows of rollers to obtain mixed fiber strands with orderly arranged length and small cohesive force among fibers, in the drafting process, the fed mixed fiber drawn sliver is drafted through a small back area to completely tension the fibers which are not tensioned in the sliver, the tensioned fibers slide mutually, the straightening degree of the fibers is further improved in the tensioning and sliding processes, the fiber strands in the tensioning state at a front jaw in a middle area are integrally drawn out from the fiber strands through the middle area drafting, so that the small drawing effect is realized, the fiber strands in the tensioning state at the front part of the front area are integrally drawn out from the fiber strands output by the middle area jaw through the front area drafting, thereby realize big extraction drafting action, the mixed fiber strand of fibers of drafting system output makes the fibrous head end directly enter into the core that forms the yarn in the hollow spindle under the condition of weak twist or no twist, and the fibre tail end is owing to not receive the twist effect, the fibre tail end lodging is rotatory on hollow spindle surface and under the effect of vortex air current under the air current effect, thereby it forms the outsourcing fibre to constantly wrap up on the core to drive along with entering into the inside yarn of hollow spindle constantly output of yarn, thereby obtain fire control and use fire-retardant yarn.

Claims

1. The production method of the fire-fighting flame-retardant yarn is characterized in that the method comprises the steps of placing flame-retardant modacrylic fiber, viscose fiber and flame-retardant polyester fiber in a disc-type plucker according to a mixing proportion, arranging a first weighing device, a second weighing device and a third weighing device at the bottom of a disc of the disc-type plucker, dividing the three weighing devices into three arc-shaped areas by 3 inserted partition plates, weighing the three weighing devices in each spinning through the fiber amount required in each spinning and the mixing proportion of the three fibers, putting the three fibers in the disc-type plucker according to the weighing arrangement, drawing out the partition plates and vibrating the disc after putting is completed, thus realizing highly uniform discharge of the three fibers in the disc, rotating a plucking beater along the axial direction of the disc, sucking one layer of fibers on the inner surface of the disc into a plucking tower through negative pressure in the rotating process, the cotton picking machine is characterized in that a single beater rotates in sequence in the cotton picking tower to freely beat and open, and a double beater rotates to freely tear and open, so that sucked mixed fibers are fully opened, and the opened mixed fibers are driven by negative pressure to enter a cotton mixing machine through a corresponding conveying pipeline; the cotton mixing machine adopts a rear cotton mixing machine comprising 4 high cotton bins and a front cotton mixing machine comprising 4 high cotton bins, rear fiber inlet ports are respectively arranged on rear fiber inlet pipes which are positioned right above the 4 high cotton bins of the rear cotton mixing machine, rear fiber stripping roller pairs are arranged at the bottom ends of the 4 high cotton bins of the rear cotton mixing machine, a horizontal fiber conveying and reciprocating rotating fiber conveying mixed curtain is arranged right below the 4 high cotton bins, a rear fiber mixing box is arranged right in front of the fiber conveying mixed curtain, a rear cotton mixing machine fiber conveying pipe is arranged at the bottom of the rear fiber mixing box, forward fiber inlet ports which are always in an open state are respectively arranged on the forward fiber inlet pipes which are positioned right above the 4 high cotton bins of the front cotton mixing machine, front fiber stripping roller pairs are arranged at the bottom ends of the 4 high cotton bins of the front cotton mixing machine, 90-degree bent pipes are respectively arranged right below the 4 high cotton bins, the other ends of the bent pipes are kept in vertical alignment, oblique upward reciprocating rotation and grabbing nails are evenly arranged on the bent pipes, and the upward reciprocating rotation are vertically aligned, and the grabbing nails are evenly arranged on the bent pipes The fiber curtain is provided with a front fiber mixing box right in front of the fiber grabbing curtain, the bottom of the front fiber mixing box is provided with a fiber conveying pipe of a front cotton mixing machine, the mixed fibers grabbed by the cotton grabbing machine enter a rear cotton mixing machine, at the moment, rear fiber openings on the rear fiber pipes are sequentially opened from back to front, so that the mixed fibers are sequentially and gradually increased in height and are input into each cotton bin, the differential time input of the fibers in each cotton bin is realized, the rear fiber stripping roller pairs at the bottoms of the high cotton bins after the initial conveying are simultaneously started to work, the fibers in the high cotton bins are relatively torn and opened and then are stripped and fall onto the fiber conveying mixed curtain, the rear fiber openings on the rear fiber pipes are continuously and sequentially opened from back to front in the working process of the rear fiber stripping roller pairs, the differential time continuous input of the fibers in each cotton bin is realized, and the fiber conveying mixed curtain is circularly and repeatedly rotated, so that the falling fibers of each high cotton bin are superposed on the fiber conveying mixed curtain along the height direction to realize the effective mixing of three fibers, the fiber conveying mixed curtain drives the fibers to continuously fall into the rear fiber mixing box to realize the uniform mixing of the three fibers, the fibers in the rear fiber mixing box are conveyed into the front cotton mixing machine through the fiber conveying pipe of the rear cotton mixing machine, the fiber advancing opening on the fiber advancing pipe is always opened at the moment, so that the mixed fibers are simultaneously input into each cotton bin, when the height of the mixed fiber layer in each cotton bin reaches a set value, the front fiber stripping rollers at the bottom of each high cotton bin start working, so that the fibers in each high cotton bin are relatively torn and loosened and then stripped to fall into the corresponding bent pipe, the fibers are vertically aligned and output at the other end after the fibers are conveyed by different paths of each bent pipe to obtain the mixed fiber layer of a transverse layer, and then the effective mixing of the three fibers is realized, the mixed fiber layer is grabbed simultaneously along the thickness direction by the grabbing fiber curtain, then effective mixing of three fibers is realized again in longitudinal grabbing, the fibers are continuously driven by the grabbing fiber curtain to fall into the front mixed fiber box, so that uniform mixing of the three fibers is realized, the fibers in the front mixed fiber box are sent into the carding machine through a fiber conveying pipe of the front cotton mixer, the mixed fiber bundle in the carding machine is fed in a control mode through a detection roller pair comprising 6-10 upper detection rollers and corresponding lower holding rollers, then the holding feeding is controlled through feeding of an upper feeding roller and a lower feeding plate, the pressure reaction of the upper detection roller on the pressed mixed fiber bundle with the corresponding width is detected in the process, so that the thickness of the mixed fiber bundle with the width is indirectly obtained, the rotating speed of the detection roller pair is controlled according to the detected thickness, and uniform feeding of the mixed fiber bundle is realized, the fed mixed fiber bundle is beaten and loosened by the licker-in rotating in front under the holding of the cotton feeding control pair, the loosening of the mixed fiber bundle is realized in the beating, the complete transfer of the mixed fiber from the cotton feeding control pair to the licker-in is realized, the gradual thinning of the mixed fiber is realized in the transfer due to the fact that the feeding speed is lower than the speed of the licker-in, the loosening effect is enhanced, the mixed fiber transferred to the licker-in is completely stripped by the large-diameter cylinder next to the mixed fiber, the mixed fiber transferred to the cylinder is driven by the cylinder to sequentially enter a rear carding area between the cylinder and a rear fixed cover plate next to the cylinder, a middle carding area between the cylinder and a middle movable cover plate next to the cylinder, and a front carding area between the cylinder and a front fixed cover plate next to the cylinder, so that the loosening carding of the fiber is performed in the rear carding area, the single-fiber carding and carding in the middle carding area are performed in sequence, Further straightening and carding the fibers in the front carding area, transferring and condensing the carded mixed fibers into a mixed fiber web by a doffer part with small diameter, and gathering the mixed fibers into a mixed fiber strip through a bell mouth; the mixed fiber sliver is subjected to three-path sliver finishing to realize uniform finishing of linear density and more uniform and fine mixing of three fibers so as to obtain a corresponding mixed fiber drawn sliver, the first path sliver finishing adopts small back region linear drafting and large front region linear drafting to realize the main removing action of a front hook, the second path sliver finishing adopts large back region linear drafting and small front region linear drafting to realize the main removing action of a rear hook, the third path sliver finishing adopts back region curve drafting and front region curve drafting to realize the complete straightening action of a hook, the mixed fiber drawn sliver is directly prepared into fire-fighting flame-retardant yarn through a vortex spinning frame, the mixed fiber drawn sliver is subjected to large extraction drafting through a drafting system consisting of four rows of rollers so as to obtain mixed fiber strands with regularly arranged lengths and small cohesive force among the fibers, and the head end diameter of the fibers enters a hollow spindle to form a yarn core under the condition of weak twist or even no twist, and the fiber tail end falls down on the surface of the hollow ingot under the action of airflow and rotates under the action of vortex airflow, and the fiber tail end is continuously wrapped on the core part along with the continuous output drive of the yarn to form an outer wrapping fiber, so that the required fire-fighting flame-retardant yarn is obtained.

2. The method for producing fire-fighting flame-retardant yarn according to claim 1, characterized in that the method comprises the following specific steps:

step one, fiber forming: sequentially grabbing cotton by a disc, mixing cotton by a rear cotton mixer, mixing cotton by a front cotton mixer and carding cotton by a front cotton mixer to prepare a mixed fiber strip, wherein the disc is mutually connected with the flame-retardant modacrylic fiber, the viscose fiber and the flame-retardant polyester fiber through fiber conveying pipelines;

the disc type bale plucker is adopted in the disc type bale plucker, the bale plucker comprises a disc for containing fibers, the disc is of a circular structure, the upper side surface of the disc is completely opened, a first weighing device, a second weighing device and a third weighing device which are of a fan-shaped structure are respectively arranged on the lower side surface of the disc, the fan-shaped areas of the lower side surface of the disc occupied by the first weighing device, the second weighing device and the third weighing device are the same or different, the first weighing device, the second weighing device and the third weighing device are integrally fixed on the lower side surface of the disc, a first embedding groove is arranged in the height direction of the disc between the first weighing device and the second weighing device, a first partition plate is inserted into the first embedding groove, a second embedding groove is arranged in the height direction of the disc between the second weighing device and the third weighing device, a second partition plate is inserted into the second embedding groove, a third embedded groove is arranged in the height direction of a disc between a third weighing device and the first weighing device, a third clapboard is inserted in the third embedded groove, a support column is arranged at the central part of the disc, a cotton grabbing beater is arranged at one side of the support column, an upward fiber conveying pipe is arranged above the support column, the cotton grabbing beater and the upward fiber conveying pipe are connected in an intercommunicating way, the cotton grabbing beater is driven by a transmission mechanism to rotate along the disc and move up and down along the height direction of the disc, the cotton grabbing beater comprises a cotton grabbing tower which is of a hollow trapezoidal structure, the upper side surface and the lower side surface of the cotton grabbing tower are both open, the upper side surface of the cotton grabbing tower is in intercommunicating connection with the upward fiber conveying pipe through corresponding pipelines, a fiber suction fan is arranged at the connection part of the cotton grabbing tower and the upward fiber conveying pipe, leveling rods are arranged at equal intervals on the lower side surface of the cotton grabbing tower, the leveling rod is connected with the lower side surface of the cotton grabbing tower through a bearing, so that the leveling rod can rotate freely, a leveling card clothing with a sawtooth structure is arranged on the leveling rod, a lower beater is arranged in the cotton grabbing tower and is of a single beater structure, a middle roller of the lower beater is connected to the inner side surface of the cotton grabbing tower through a bearing, a lower beater card clothing with a sawtooth structure is arranged on the middle roller of the lower beater, the lower beater is driven by a corresponding transmission mechanism to rotate, an upper beater is arranged in the cotton grabbing tower at the upper part of the lower beater and is of a double beater structure, a middle roller of the upper beater is connected to the inner side surface of the cotton grabbing tower through a bearing, an upper beater card clothing with an elastic angle nail structure is arranged on the middle roller of the upper beater, and the upper beater is driven by the corresponding transmission mechanism to rotate upwards together with mutually contacted parts in different directions; when the device is used, the first partition plate, the second partition plate and the third partition plate are respectively inserted into the first embedding groove, the second embedding groove and the third embedding groove to divide the disc into three parts, then the total fiber amount of the flame-retardant modacrylic fiber, the viscose fiber and the flame-retardant polyester fiber and the blending proportion required by the three fibers required during each spinning process are obtained, the values required by the first weighing device, the second weighing device and the third weighing device are set according to the obtained data, then the corresponding flame-retardant modacrylic fiber, the viscose fiber and the flame-retardant polyester fiber are respectively put in, when the put-in fiber amount reaches the value set by the weighing device, the putting in is stopped, after the putting in of the three fibers is finished, the first partition plate, the second partition plate and the third partition plate are pulled out, and then the fiber suction fan, the lower beater are kept, The upper beater is all in a stop state, the corresponding transmission mechanism drives the cotton grabbing beater to rotate along the disc, so that the leveling rod on the lower side surface of the cotton grabbing tower is contacted with the fibers which are thrown in at the moment and have the highest height, the high fibers are moved to the lower fibers under the driving of the leveling card clothing on the leveling rod, then the cotton grabbing beater continuously descends to realize the preliminary leveling of the three fibers which are thrown in, the transmission mechanism drives the disc to vibrate, so that the three fibers which are preliminarily leveled in the disc are further finely leveled, then the fiber suction fan, the lower beater and the upper beater are all set to be in a working state, the height of the cotton grabbing beater is set to be a state that the leveling rod on the lower side surface of the cotton grabbing tower is in close pressing contact with the fibers after leveling, the cotton grabbing beater continuously rotates along the axial direction of the disc, and a layer of fibers on the surface in the disc are sucked into the cotton grabbing tower through negative pressure in the rotating process, the sucked mixed fibers are firstly freely beaten and loosened by the lower beater card clothing on the rotating lower beater, and then the mixed fibers enter between the upper beaters, so that the mixed fibers are torn in a free state by the upper beater card clothing on the two upper beaters between the upper beaters, and the torn and loosened fibers are continuously conveyed upwards under the drive of the upper beaters rotating upwards in the same direction; the mixed fiber which is torn and opened is driven by negative pressure to enter a rear cotton mixing machine through a corresponding conveying pipeline, the rear cotton mixing machine comprises 4 high cotton bins, the high cotton bins are in a cuboid shape with an open upper side surface and an open lower side surface, rear fiber inlet pipes are arranged above the 4 high cotton bins of the rear cotton mixing machine and are communicated with a bale plucker, rear fiber inlet openings with controllable opening and closing states are respectively arranged at the bottoms of the rear fiber inlet pipes which are positioned right above the upper side surfaces of the high cotton bins, rear fiber stripping roller pairs are arranged in the lower side surfaces of the high cotton bins, rear fiber stripping card clothing is arranged on the rear fiber stripping roller pairs, the rear fiber stripping roller pairs are driven by corresponding transmission mechanisms to rotate in different directions but at the same speed, the mutual contact parts of the rear fiber stripping roller pairs are enabled to rotate downwards, a horizontal fiber conveying mixed curtain which rotates in a circulating and reciprocating manner is arranged right below the lower side surfaces of the 4 high cotton bins, a rear fiber mixing box is arranged right in front of the fiber conveying mixing curtain, a rear fiber mixing machine fiber conveying pipe is arranged at the bottom of the rear fiber mixing box, the mixed fibers grabbed by a plucker enter the rear fiber mixing machine, a rear fiber opening on the rear fiber mixing pipe is sequentially opened from back to front at the moment, so that the mixed fibers are sequentially and gradually increased in height and are input into the cotton bins, different input of the fibers in the cotton bins is realized, after the initial conveying of the mixed fibers is completed by the high cotton bins, a rear fiber stripping roller pair at the bottom of each high cotton bin starts to work simultaneously, so that the fibers in the high cotton bins are stripped and fall onto the fiber conveying mixing curtain after being relatively torn and opened, the rear fiber opening on the rear fiber mixing pipe continues to circularly and sequentially open from back to front in the working process of the rear fiber stripping roller pair, so that the continuous input of the fibers in the cotton bins is realized, the fiber mixing curtain rotates along with the circulation of the fiber conveying roller pair, the front cotton mixing machine comprises 4 high cotton bins, a forward fiber pipe and a rear cotton mixing machine are connected with each other, forward fiber openings which are always in an open state are respectively arranged at the bottoms of the forward fiber pipes which are positioned right above the upper side surfaces of the high cotton bins, a front fiber stripping roller pair is arranged in the lower side surface of each high cotton bin, front fiber stripping card clothing is arranged on the front fiber stripping roller pair, the front fiber stripping roller pair is driven by a corresponding transmission mechanism to rotate in different directions but at the same speed, the mutual contact parts of the front fiber stripping roller pair keep downward rotation, and 90-degree bent pipes are respectively arranged right below the 4 high cotton bins, the other end of the elbow pipe keeps vertical alignment, a fiber grabbing curtain which is inclined to rotate upwards in a circulating and reciprocating mode and evenly arrayed with cotton grabbing brads is arranged at the vertical alignment end of the elbow pipe, a cotton homogenizing roller is arranged at the top end of the fiber grabbing curtain, cotton homogenizing card clothing is arranged on the cotton homogenizing roller, a front fiber mixing box is arranged right in front of the fiber grabbing curtain, a front cotton mixing machine fiber conveying pipe is arranged at the bottom of the front fiber mixing box, fibers in a rear fiber mixing box of a rear cotton mixing machine are conveyed into the front cotton mixing machine through the rear cotton mixing machine fiber conveying pipe, a forward fiber opening in the forward fiber pipe is always opened at the moment, so that the mixed fibers are simultaneously input into each high cotton bin, when the height of a mixed fiber layer in each high cotton bin reaches a set value, the front fiber stripping rollers at the bottom of each high cotton bin start to work, and the fibers in each high cotton bin are stripped and fall into the corresponding elbow pipe after being torn and opened, the other ends of the bent pipes are vertically aligned, so that the lengths of the bent pipes are different, the mixed fibers falling into the bent pipes are conveyed through different paths of the bent pipes and then are vertically aligned and output at the other ends of the bent pipes, a transversely-laid mixed fiber layer is obtained, effective mixing of the three fibers under different transmission paths is realized, the mixed fiber layer is simultaneously grabbed along the thickness direction by a grabbing fiber curtain, effective mixing of the three fibers is realized again in longitudinal grabbing, and the grabbing fiber curtain drives the fibers to continuously and uniformly fall into a front fiber mixing box under the action of a cotton homogenizing roller, so that uniform mixing of the three fibers is realized;

step two, strip finishing: the mixed fiber strips prepared in the first step are subjected to three-step strip finishing to realize uniform finishing of linear density and more uniform and fine mixing of three fibers, so that corresponding mixed fiber drawn strips are obtained; the first sliver finishing adopts small back area linear drafting and large front area linear drafting to realize the removing action of the front hook, at the moment, the hook at the front end of part of the fiber is changed from a completely bent state to a right angle or obtuse angle connection state with the fiber main body under the action of the small back area linear drafting, the hook at the front end of the fiber is changed to an obtuse angle or linear connection state with the fiber main body under the action of the large front area linear drafting, the second sliver finishing adopts the large back area linear drafting and the small front area linear drafting to realize the removing action of the back hook, at the moment, the hook at the back end of part of the fiber is changed from the completely bent state to an acute angle, right angle or obtuse angle connection state with the fiber main body under the action of the large back area linear drafting, and the hook at the back end of the fiber and the fiber main body are changed to a right angle, obtuse angle or linear connection state under the action of the small front area linear drafting, in the third sliver finishing, the back region curve drafting and the front region curve drafting are adopted to realize the complete straightening function of the hook, and at the moment, the fiber which finishes the preliminary bending finishing is completely straightened under the curve drafting function;

step three, whole yarn forming: the mixed fiber drawn sliver prepared in the second step is directly prepared into fire-fighting flame-retardant yarn through a vortex spinning frame, the mixed fiber drawn sliver in the process is greatly drawn and drafted through a drafting system consisting of four rows of rollers to obtain mixed fiber strands with orderly arranged length and small cohesive force among fibers, in the drafting process, the fed mixed fiber drawn sliver is drafted through a small back area to completely tension the fibers which are not tensioned in the sliver, the tensioned fibers slide mutually, the straightening degree of the fibers is further improved in the tensioning and sliding processes, the fiber strands in the tensioning state at a front jaw in a middle area are integrally drawn out from the fiber strands through the middle area drafting, so that the small drawing effect is realized, the fiber strands in the tensioning state at the front part of the front area are integrally drawn out from the fiber strands output by the middle area jaw through the front area drafting, thereby realize big extraction drafting action, the mixed fiber strand of fibers of drafting system output makes the fibrous head end directly enter into the core that forms the yarn in the hollow spindle under the condition of weak twist or no twist, and the fibre tail end is owing to not receive the twist effect, the fibre tail end lodging is rotatory on hollow spindle surface and under the effect of vortex air current under the air current effect, thereby it forms the outsourcing fibre to constantly wrap up on the core to drive along with entering into the inside yarn of hollow spindle constantly output of yarn, thereby obtain fire control and use fire-retardant yarn.