CN113774532A - Production method of high-strength heat-resistant sewing thread for dust removal filter bag - Google Patents
Production method of high-strength heat-resistant sewing thread for dust removal filter bag Download PDFInfo
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- CN113774532A CN113774532A CN202111118544.4A CN202111118544A CN113774532A CN 113774532 A CN113774532 A CN 113774532A CN 202111118544 A CN202111118544 A CN 202111118544A CN 113774532 A CN113774532 A CN 113774532A
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
- D02G3/04—Blended or other yarns or threads containing components made from different materials
- D02G3/045—Blended or other yarns or threads containing components made from different materials all components being made from artificial or synthetic material
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
- D02G3/38—Threads in which fibres, filaments, or yarns are wound with other yarns or filaments, e.g. wrap yarns, i.e. strands of filaments or staple fibres are wrapped by a helically wound binder yarn
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/44—Yarns or threads characterised by the purpose for which they are designed
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D10B2321/04—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of halogenated hydrocarbons
- D10B2321/042—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of halogenated hydrocarbons polymers of fluorinated hydrocarbons, e.g. polytetrafluoroethene [PTFE]
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
- D10B2331/021—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides aromatic polyamides, e.g. aramides
Abstract
The invention discloses a production method of high-strength heat-resistant sewing thread for a dust-removing filter bag, which belongs to the technical field of dust-removing filter bags, the produced sewing thread is suitable for a high-temperature environment, has excellent chemical stability, high tensile strength, low shrinkage rate and excellent wear resistance, is not easy to have the phenomena of wire jumping, wire breakage and the like in the using process, is uniform and full in stitches, does not leave gaps after needle holes pass the thread, can ensure the filtering efficiency of a filtering material, can improve the mechanical property defect of the sewing thread of the dust-removing filter bag by adopting a composite textile technology, has strong cohesive force and good attachment effect between the sewing thread and the filtering material after the sewing thread is used for sewing the dust-removing filter bag, has small displacement and dislocation probability between the sewing thread and the filtering material, has small influence of the needle holes on the gravity tension and the thermal creep of the filter bag, reduces the escape of dust from the needle holes, has good wear resistance, high strength and good heat resistance of the sewing thread, and continuous abrasion and falling off, the dust removal effect of the filter bag is ensured.
Description
Technical Field
The invention belongs to the technical field of dust-removing filter bags, and particularly relates to a production method of a high-strength heat-resistant sewing thread for a dust-removing filter bag.
Background
The sewing thread is used as an important auxiliary material for manufacturing the dust-removing filter bag, and needs to keep higher strength under strict working conditions, which has very important significance for the safe and reliable use of the filter bag. According to the requirements of GB/T6719-2009 technical requirements of bag-type dust collectors, the performance of the sewing thread for the dust-removing filter bag is not lower than that of the filter bag, so the sewing thread is also one of important factors influencing the service life and the reliability of the dust-removing filter bag. PTFE material becomes the first choice of high temperature resistant sewing thread because of its excellent chemical properties. However, the failure of the conventional PTFE sewing thread under the effect of long-term hot smoke sometimes occurs, and the attention of the people in the industry is also raised. Therefore, aiming at the defects of the traditional PTFE threading, the composite PTFE sewing thread is developed, so that the composite PTFE sewing thread can ensure the dust removal effect of the filter bag when being used as the sewing thread of the dust removal filter bag, and has higher economic value for the air environment industry. As is known, a dust removal filter bag generally works at a high temperature, so that a PTFE sewing thread is very easy to generate a thermal creep phenomenon at a high temperature for a long time, and common adverse reactions on the dust removal filter bag are manifested as bag expansion, filter bag lengthening, needle hole enlargement, loosening, fracture, falling off and the like at a sewing position, so that the dust removal filter bag is damaged, and a great risk is brought to a dust removal system. The creep property of PTFE is greatly influenced by temperature, and the higher the temperature is, the higher the creep is, the thermal creep effect is formed, which is particularly characterized in that the linear expansion factor of PTFE changes irregularly along with the change of the temperature, and the fracture strength of a linear material attenuates along with the change of the temperature and is close to failure under a certain temperature condition; the friction factor of PTFE is extremely small, only 1/5 of polyethylene, which is an important characteristic of perfluorocarbon surfaces, and PTFE has non-viscosity due to extremely low intermolecular interaction of fluorine-carbon chains; PTFE is typically a soft and weak polymer with low intermolecular attraction, low rigidity, hardness, and strength, and the resulting material exhibits poor abrasion resistance. The friction factor is smaller because of the poor cohesion between the monofilaments. After the PTFE sewing thread is used for removing the sewing of filter bag, the cohesion force between PTFE sewing thread and filter material is little, the solid effect of attaching is poor, thereby bring negative effects for the dust removal effect of dust removal filter bag, constantly produce displacement and dislocation between sewing thread and the filter material, the pinhole constantly is drawn greatly under the influence of filter bag gravity tensile and hot creep, thereby lead to the dust to escape from the pinhole, the dust removal effect of filter bag has been reduced, low friction factor, the dust that is amassed in the pinhole easily slips, can't form the jam to the pinhole, influence the dust removal effect of filter bag. The inferior wear resistance of the sewing thread seriously affects the dust removal effect of the dust removal filter bag: on the sewing thread of the bag head and the bag body, dust is taken as a friction medium and permeates between the upper thread and the bottom thread of the sewing thread, and the dust particles and the PTFE sewing thread are broken due to frequent friction, so that the filter bag is damaged, and the dust removal effect of the filter bag is reduced; the sewing thread is damaged and broken due to scraping friction between the bottoms of the filter bags or between the filter bags and the box body caused by dust removal injection or high-air-speed air inlet at the joint parts of the filter bags and the ribs of the bag cage, between the filter bags at the air inlet of the dust remover and at the parts close to the filter bags and the box body of the dust remover, so that the dust removal effect of the filter bags is reduced; the dust collector and the filter bag at the air inlet are continuously washed by dust particles, so that the filter bag is easy to break and fall off due to the abrasion of sewing threads, and the dust collection effect of the filter bag is reduced. Because of the adverse effect of the characteristics of PTFE sewing thread on the dust removal filter bag, certain quality accidents have occurred in practical application. For example, the sewing thread has reduced strength due to continuous high temperature action, and the sewing thread is broken due to frequent friction, thereby not only affecting the dust removal effect of the filter bag, but also directly bringing great economic loss to enterprises. Those skilled in the art are in need of developing a method for producing a high-strength heat-resistant sewing thread for a dust filter bag to meet the existing application market and performance requirements.
Disclosure of Invention
In view of the above, the invention provides a production method of a high-strength heat-resistant sewing thread for a dust filter bag.
A production method of high-strength heat-resistant sewing threads for dust removal filter bags comprises the following steps of performing paste extrusion, pushing, rolling and forming by a conventional production method, wherein the paste extrusion is performed at a pressure of 2-5 MPa and a compression ratio of 3: 1, the paste extrusion temperature is 35-70 ℃, and the extrusion compression ratio is 100: 1-400: 1, rolling the base sheet into an ETFE rolled base sheet by a rolling mill, and further comprising the following steps:
the flat pressing flat thermoprinting mode has a simpler action program, the workbench does not move, the thermoprinting device does not rotate, and the aluminum foil ETFE film is transferred by heating; the copperplate is a 2mm thick copper plane plate; its advantages are high heat transfer performance, high pressure resistance, high antiwear nature and no deformation.
By utilizing the principle of hot-pressing transfer, the hot creep property of metals such as aluminum is low, the aluminum layer is transferred to the surface of the ETFE film, namely, under the action of certain temperature and pressure, the adhesive force of the hot-melting layer is reduced, the aluminum layer is peeled off from the base film, the aluminum layer is adhered to the hot stamping material by the thermosensitive adhesive, and the aluminum layer is displayed on the surface of the ETFE. The elements of the electrochemical aluminum hot stamping are mainly the hot stamping property of the object to be stamped, the performance of the electrochemical aluminum material, the hot stamping temperature, the hot stamping pressure and the hot stamping speed, and the elements are controlled in the operation process.
A flat pressing flat thermoprinting machine, wherein a plate material used for thermoprinting is a copper plane plate, an ETFE substrate is positioned and installed, a heat transfer copper plane plate is bonded, the heating temperature is set to be 110-145 ℃, a thermoprinting device is pressed downwards to finish heat transfer, the heat transfer is stopped on the surface of the ETFE substrate according to the set time of 0.5-1 s, and the thermoprinting device is lifted to obtain a heat transfer electrochemical aluminum ETFE composite sheet;
ETFE was found in 1946 and started in 70 s, and was developed after FEP as a fusible fluororesin obtained by copolymerizing tetrafluoroethylene and ethylene. The ETFE has a melting point of 256-280 ℃, the crystallinity can reach 50-60%, the mechanical property is excellent, and the impact resistance, the hardness, the cold flow resistance and the creep resistance of the ETFE are better than those of PTFE and FEP.
Secondly, performing three-dimensional bidirectional stretching in a stretcher, wherein the working temperature of the stretcher is 150-250 ℃, and the linear speed is 0.8-1.2 m/min; thirdly, cutting by a cutting machine, wherein the linear speed of the cutting machine is 1-2 m/min; fourthly, twisting the mixture into a bundle by a twisting machine at the linear speed of 1.1-2.1 m/min for 200-300 times, and rolling to obtain the ETFE electrochemical aluminum composite fiber; and fifthly, adopting PTFE monofilaments as core yarns, adopting ETFE alumite composite fibers as decorative yarns, adopting aramid staple fiber yarns as solid yarns, preparing the core-spun yarns by a fancy twisting machine, setting the overfeed ratio, the drafting multiple and the tension coefficient of the fancy twisting machine, and preparing the core-spun yarns by changing the wrapping number, namely the upper twist and the lower twist, so as to obtain the high-strength heat-resistant sewing threads for the dust removal filter bag.
The core yarn is the main bearer of the strength of the circular line and is the attachment of the decorative yarn. The decorative yarn is wrapped outside the core yarn in various forms in an overfeed mode to form various patterns for decoration. The decorative yarn of the loop thread should be made of a material with small color difference, soft texture, uniform evenness and fluffy structure. The fixing yarn is wrapped outside the decorative yarn, is used for fixing the pattern of the decorative yarn and also bears partial strength.
Further, the three-dimensional biaxial stretching comprises a longitudinal stretching ratio of 4.5-6.0, a transverse stretching ratio of 9.0-10.0, a longitudinal stretching temperature of 185-195 ℃, a transverse stretching temperature of 180-190 ℃ and a heat setting temperature of 190-195 ℃.
The ratio of the feeding speed of the decorative yarn to the core yarn is called overfeed ratio, and different fancy effects such as patterns or waves can be generated by changing the overfeed ratio. The core yarn is in a tension state under a certain tension, so that the core yarn is positioned at the center during twisting. The twist affects the pattern stability of the decorative yarn on the core yarn and the yarn style.
Further, the overfeeding ratio of the fancy twister is set to be 1-3, the back draft multiple is 10-15, the front draft multiple is 10-15, the tension coefficient is 1.02-1.05, the upper twist is 150-300 twists/m, and the lower twist is 150-300 twists/m.
Further, the aramid staple fiber yarn in the fifth step is an aramid 1414 staple fiber yarn with 68.52cN/tex linear density of 48.2 tex.
Further, the PTFE thread in the fifth step is obtained by twisting each strand of PTFE with a twist number of 450-480 and a linear density of 500D, and then twisting by 3-5 plying with a twist number of 450-480.
In the process of sewing the dust-removing filter bag, the yarn is required to be soft and fluffy, have good wear resistance and prevent slippage in a needle hole, and also have high breaking strength.
The invention has the beneficial effects that:
the composite sewing thread of the production method disclosed by the invention adopts PTFE monofilaments as decorative yarns, ETFE alumite composite fibers as core yarns, aramid staple fiber yarns as fixing yarns, and a fancy twisting machine is used for preparing core spun yarns, and the aramid staple fiber yarns as fixing yarns are used as means for increasing the surface friction force of the sewing thread, so that the monofilaments are spirally wound and coated, the yarns and the filaments are well clasped after doubling and twisting, the surface friction force and the wear resistance of the sewing thread can be effectively improved, the hairiness existence rate can be improved, and a certain filling and blocking effect on pinhole clearance can be favorably realized. The compound by adopting the covering yarn form, the surface of the sewing thread is almost completely covered by the yarn material, the tension and the friction of the sewing thread are consistent, and compared with the compound sewing thread which directly uses silk and yarn and twists, the sewing thread has better sewing efficiency, low thread breakage rate, better heat-resistant creep property and better pinhole plugging effect. Therefore, the high-temperature environment can influence the fracture strength of the PTFE sewing thread, the PTFE sewing thread is often fractured in the actual use process, so that the filter bag is damaged, the weight loss rate of the composite sewing thread disclosed by the invention at high temperature is smaller than that of the PTFE pure sewing thread, and the thermal stability of the composite sewing thread is improved.
Compared with the prior art, the invention has the following advantages:
the PTFE composite sewing thread can be prepared by adopting the method of coating PTFE filaments by using the reinforcing material, and the defects of the traditional PTFE sewing thread, such as loss of strength due to hot creep, lack of cohesive force, poor wear resistance and the like, can be overcome. The present application scientifically recognizes and uses materials and does not use them blindly and exaggeratedly because of the excellent properties that the materials have in some respect. Under the condition that the performance of the PTFE material cannot be changed, in order to better ensure the safety of the PTFE sewing thread in the use process of the dust-removing filter bag and prolong the service life of the dust-removing filter bag, the composite textile technology is adopted to improve the mechanical property defect of the PTFE sewing thread of the dust-removing filter bag, thereby contributing to the good application of the dust-removing filter bag. The phenomena of wire jumping, wire breakage and the like are not easy to occur in the using process, the stitch is uniform and full, no gap is left after the needle hole passes the wire, the filtering efficiency of the filtering material can be ensured, the mechanical property defect of the sewing thread of the dust-removing filtering bag can be improved by adopting the composite textile technology, and the filter bag contributes to good application of the dust-removing filtering bag. When the sewing thread is used for sewing the dust-removing filter bag, the cohesion force between the sewing thread and the filter material is strong, the fixing and attaching effect is good, the probability of constantly generating displacement and dislocation between the sewing thread and the filter material is small, the influence of the needle hole on the gravity tension and the thermal creep of the filter bag is small, dust escape from the needle hole is reduced, the wear resistance is good, the sewing thread is high in strength and good in heat resistance, the abrasion is not broken and falls off, and the dust-removing effect of the filter bag is guaranteed.
Drawings
The invention will be described in detail with reference to the accompanying drawings, in which fig. 1: a graph of analysis for sewing thread TG, wherein a is pure PTFE sewing thread, b is the sewing thread obtained in example 1, and c is ETFE alumite composite fiber; FIG. 2 is a drawing: tensile break curves of pure PTFE sewing thread at different temperatures; FIG. 3: tensile break curves of the sewing thread obtained in example 1 at different temperatures.
Detailed Description
Example 1
Firstly, paste is extruded, pushed, pressed and molded under the pressure of 5MPa and the compression ratio of 3: 1, the paste is extruded at the temperature of 70 ℃ and the compression ratio of 400: 1, and the paste is rolled into an HT-2170ETFE rolled substrate by a rolling mill; secondly, TYPB-520 type flat-pressing flat thermoprinting machine, the power of an electric hot tray is 2.5kw, and the pressure is 50N/m2The temperature of the electrochemical aluminum foil is 160 ℃, the plate material used for hot stamping is a copper plane plate, an ETFE substrate is positioned and installed, the copper plane plate is bonded and thermally transferred, the heating temperature is set to be 110 ℃, a hot stamping device is pressed down to complete thermal transfer, a first-grade product of the electrochemical aluminum Wenzhou golden lion electrochemical aluminum foil is subjected to plastic coating, then the first-grade product stays on the surface of the ETFE substrate according to the set time of 0.5s, and the hot stamping device is lifted up to obtain a thermal transfer electrochemical aluminum ETFE composite sheet; then, the mixture enters a stretcher for three-dimensional bidirectional stretching, wherein the longitudinal stretching ratio is 4.5, the transverse stretching ratio is 9.0, the longitudinal stretching temperature is 185 ℃, the transverse stretching temperature is 180 ℃, the heat setting temperature is 190 ℃, and the linear speed is 0.8 m/min; secondly, cutting by a cutting machine, wherein the linear speed of the cutting machine is 1 m/min; then twisting the mixture into bundles by a twisting machine at the linear speed of 1.1m/min by 300, and then rolling to obtain the ETFE electrochemical aluminum composite fiber; finally, PTFE monofilament is used as core yarn, ETFE electrochemical aluminum composite fiber is used as decorative yarn, aramid staple fiber yarn is used as fixing yarn, core spun yarn is prepared by a fancy twisting machine, the overfeed ratio of the fancy twisting machine is 1, the back draft multiple is 10, the front draft multiple is 10, the tension coefficient is 1.02, and the upper draft ratio is higher than the lower draft ratioAnd (3) twisting at 150 twists/m, and twisting at 150 twists/m to prepare the core-spun yarn, namely the high-strength heat-resistant sewing thread for the dust-removing filter bag. The aramid staple fiber yarn is an aramid 1414 staple fiber yarn with 68.52cN/tex linear density of 48.2tex, the PTFE yarn is a PTFE twisted yarn with a PTFE twisting direction Z and a single-wire twisting number of 480 twists, the single-wire linear density is 500D, then 5-ply twisting linear density 2483D is carried out, the ply twisting number is 450 twists, and the breaking strength is 2.29CN/dtex, and the breaking elongation is 5.23%.
The product performance is as follows: the breaking strength is 2.44CN/dtex, and the elongation at break is 5.23%.
Comparative example 1
This comparative example is the pure PTFE yarn of example 1, i.e., the ETFE alumite composite fiber, compared to comparative document 1.
Comparative example 2
This comparative example is an alumite ETFE line in example 1, compared to comparative document 1.
Example 2
Firstly, paste extrusion pressing calendaring molding is carried out according to a conventional production method, the pressure is 5MPa, the compression ratio is 3: 1, the blank is pressed, the paste extrusion temperature is 70 ℃, the extrusion compression ratio is 400: 1, rolling the mixture into a HT-2170ETFE rolled substrate by a rolling mill; secondly, a TYPB-520 type flat pressing flat thermoprinting machine is used, the plate material used for thermoprinting is a copper plane plate and an alumite Wenzhou golden lion primary product of a plastic-passing alumite, an ETFE substrate is positioned and installed, the copper plane plate is bonded and thermally transferred, the heating temperature is set to be 145 ℃, the thermoprinting device is pressed downwards to complete thermal transfer, the ETFE substrate stays on the surface of the ETFE substrate according to the set time of 1s, and the thermoprinting device is lifted to obtain a thermal transfer alumite ETFE composite sheet; then, the mixture enters a stretcher for three-dimensional bidirectional stretching, wherein the longitudinal stretching ratio is 6.0, the transverse stretching ratio is 10.0, the longitudinal stretching temperature is 195 ℃, the transverse stretching temperature is 190 ℃, the heat setting temperature is 195 ℃, and the linear speed is 1.2 m/min; then, cutting by a cutting machine, wherein the linear speed of the cutting machine is 2 m/min; secondly, twisting the mixture into bundles by a twisting machine at the linear speed of 2.1m/min, and rolling to obtain the ETFE electrochemical aluminum composite fiber; then, PTFE monofilament is used as core yarn, ETFE electrochemical aluminum composite fiber is used as decorative yarn, aramid staple fiber yarn is used as solid yarn, core-spun yarn is prepared by a fancy twisting machine, the overfeed ratio of the fancy twisting machine is 3, the back draft multiple is 15, the front draft multiple is 15, the tension coefficient is 1.05, the upper twist is 300 twists/m, and the lower twist is 300 twists/m, and the core-spun yarn is prepared, namely the high-strength heat-resistant sewing thread for the dust removal filter bag. The aramid staple fiber yarn is an aramid 1414 staple fiber yarn with 68.52cN/tex linear density of 48.2tex, the PTFE yarn is a PTFE yarn with PTFE twisting direction Z and each strand of monofilament twisting number of 450 twists, the monofilament linear density of 500D, then 3 plying and twisting linear density of 1532D are carried out, the plying twisting number of 450 twists obtains breaking strength of 2.61CN/dtex and breaking elongation of 4.31%.
The product performance is as follows: the breaking strength is 2.37CN/dtex, and the elongation at break is 5.46%.
Note: reference is made to GB/T6836-2007 sewing thread; the test method of the tensile property of the chemical fiber filament of the reference standard GB/T14344-2003 has the gauge length of 500mm and the tensile speed of 500mm/min, and each test is carried out 20 times.
TABLE 1 TG analysis data of sewing threads of example 1, comparative example 2
In conclusion, the ETFE surface is provided with the metal aluminum, so that the high-temperature creep property can be improved, the coating yarn is adopted for compounding, the surface of the sewing thread is almost completely coated by the yarn material, the tension and the friction force of the sewing thread are consistent, and compared with the composite sewing thread which is directly twisted by silk and yarn, the composite sewing thread has the advantages of better sewing efficiency, low thread breakage rate, better heat-resistant creep property and better pinhole plugging effect.
Claims (5)
1. A production method of high-strength heat-resistant sewing threads for dust removal filter bags comprises the following steps of performing paste extrusion, pushing, rolling and forming by a conventional production method, wherein the paste extrusion is performed at a pressure of 2-5 MPa and a compression ratio of 3: 1, the paste extrusion temperature is 35-70 ℃, and the extrusion compression ratio is 100: 1-400: the ETFE calendered substrate is formed by calendering through a calender and is characterized by also comprising the following steps: firstly, a flat pressing flat thermoprinting machine is used, a plate material used for thermoprinting is a copper plane plate, an ETFE substrate is positioned and installed, a heat transfer copper plane plate is bonded, the heating temperature is set to be 110-145 ℃, a thermoprinting device is pressed downwards to finish heat transfer, the ETFE substrate surface is stopped and the thermoprinting device is lifted up according to the set time of 0.5-1 s, and a heat transfer electrochemical aluminum ETFE composite sheet is obtained; secondly, performing three-dimensional bidirectional stretching in a stretcher, wherein the working temperature of the stretcher is 150-250 ℃, and the linear speed is 0.8-1.2 m/min; thirdly, cutting by a cutting machine, wherein the linear speed of the cutting machine is 1-2 m/min; fourthly, twisting the mixture into a bundle by a twisting machine at the linear speed of 1.1-2.1 m/min for 200-300 times, and rolling to obtain the ETFE electrochemical aluminum composite fiber; and fifthly, adopting PTFE monofilaments as core yarns, adopting ETFE alumite composite fibers as decorative yarns, adopting aramid staple fiber yarns as solid yarns, preparing the core-spun yarns by a fancy twisting machine, setting the overfeed ratio, the drafting multiple and the tension coefficient of the fancy twisting machine, and preparing the core-spun yarns by changing the wrapping number, namely the upper twist and the lower twist, so as to obtain the high-strength heat-resistant sewing threads for the dust removal filter bag.
2. The method for producing a high-strength heat-resistant sewing thread for a dust filter bag according to claim 1, wherein the second three-dimensional biaxial stretching is performed at a longitudinal stretching ratio of 4.5 to 6.0, a transverse stretching ratio of 9.0 to 10.0, a longitudinal stretching temperature of 185 to 195 ℃, a transverse stretching temperature of 180 to 190 ℃ and a heat setting temperature of 190 to 195 ℃.
3. The method for producing a high-strength heat-resistant sewing thread for a dust filter bag according to claim 1, wherein the fifth step is to set the over-feed ratio of the fancy twister to 1 to 3, the back draft multiple to 10 to 15, the front draft multiple to 10 to 15, the tension coefficient to 1.02 to 1.05, the upper twist to 150 to 300 twists/m, and the lower twist to 150 to 300 twists/m.
4. The method for producing the high-strength heat-resistant sewing thread for the dust-removing filter bag according to claim 1, wherein the aramid staple fiber yarn in the fifth step is 68.52cN/tex aramid 1414 staple fiber yarn with a linear density of 48.2 tex.
5. The production method of the high-strength heat-resistant sewing thread for the dust-removing filter bag according to claim 1, wherein the PTFE thread in the fifth step is obtained by twisting PTFE each strand of monofilament with a twist number of 450-480 and a linear density of the monofilament of 500D, and then twisting the monofilament by 3-5 plying with a twist number of 450-480.
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| CN113199839A (en) * | 2021-05-07 | 2021-08-03 | 江苏英普科科技股份有限公司 | Anti-static sterile medicament bag and preparation method thereof |
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