CN111996626A - Production system and production method of aramid fiber cord fabric primary twisted yarn - Google Patents
Production system and production method of aramid fiber cord fabric primary twisted yarn Download PDFInfo
- Publication number
- CN111996626A CN111996626A CN202010723628.XA CN202010723628A CN111996626A CN 111996626 A CN111996626 A CN 111996626A CN 202010723628 A CN202010723628 A CN 202010723628A CN 111996626 A CN111996626 A CN 111996626A
- Authority
- CN
- China
- Prior art keywords
- primary
- yarn
- aramid fiber
- roller
- twisted
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H7/00—Spinning or twisting arrangements
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H13/00—Other common constructional features, details or accessories
- D01H13/02—Roller arrangements not otherwise provided for
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H13/00—Other common constructional features, details or accessories
- D01H13/04—Guides for slivers, rovings, or yarns; Smoothing dies
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H13/00—Other common constructional features, details or accessories
- D01H13/10—Tension devices
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Abstract
The invention discloses a production system and a production method of aramid fiber cord fabric primary twisted yarns. The precursor to be twisted is wound on a precursor bobbin creel, under the driving action of a motor, the precursor is sequentially wound on a yarn guide wheel of an upper tension rod, a yarn guide rod and a lower tension rod forwards, then is wound on a first lower roller, an upper roller and a second lower roller forwards through a reciprocating yarn guide, and finally is wound on a primary twisting bobbin through the second lower roller to obtain primary twisted yarn. The primary twisted yarn produced by the device almost has no burr, the quality of the produced twisted yarn is qualified, the unqualified products are reduced to a great extent, the waste material is avoided, the raw material utilization rate is improved, and the influence of the waste material on the environment is also avoided. The strength of the obtained aramid fiber twisted yarn is also obviously improved to be more than 219N, the strength loss is reduced to be below 8.4 percent, the overall twisting performance is obviously improved, and the using requirement is completely met.
Description
Technical Field
The invention relates to the technical field of production of aramid fiber cord fabrics, in particular to a system and a method for producing aramid fiber cord fabric primary twisted threads.
Background
Aramid fibers, that is, aromatic polyamide fibers, are synthetic fibers obtained by polycondensation spinning of an aromatic compound as a raw material, and have excellent properties such as fatigue resistance and low thermal shrinkage, and therefore, they have been widely used in, for example, fire-proof and bulletproof products and rubber products. Due to the excellent performance of the aramid fiber, the aramid fiber cord fabric also has the excellent performances of high strength, high modulus and good cord fabric size stability, basically has no thermal expansion and contraction, has the characteristics of good corrosion resistance, insulation and the like, can be used as a framework material to be made into rubber products such as tires, rubber hose tapes, oil tanks and oil tanks, and is widely applied to special industries such as aerospace, national defense and military industry.
The production process of the aramid fiber cord fabric comprises the following steps: in the production process, a primary twisting process is a very important first process, and the primary twisting process is to carry out primary twisting and winding on aramid fiber precursors to form single-stranded primary twisted yarns with certain twist. However, due to the fact that the aramid fiber is high in bending strength, bending of the aramid fiber is difficult in the processing process, a large amount of burrs are formed in the winding and twisting process, a large amount of burrs exist on the surface of the finally obtained aramid fiber primary twisted yarn, the overall twisting quality is affected, cloth cover defect points are more during weaving in the next procedure, and the quality of the obtained product is unqualified; moreover, the strength of the twisted yarn is weak, and the amount of defective products is further increased. Unqualified products not only affect the use effect, but also greatly increase the amount of waste materials, cause a great deal of waste of raw materials and increase of the burden of environment and post-treatment caused by a great amount of waste materials.
Disclosure of Invention
The invention aims at the technical problems that: the existing prepared primary twisted yarn has more scratch burrs and insufficient strength, has great influence on the quality of prepared products, can produce a large amount of unqualified products, and causes a large amount of accumulation of waste products and waste of raw materials.
The invention is realized by the following technical scheme
An aramid fiber cord fabric primary-twist line production system comprises a raw yarn barrel, an upper tension mechanism, a wire guide mechanism, a lower tension mechanism, a reciprocating yarn guide, a lower roller, an upper roller and a primary-twist bobbin;
and the precursor yarn to be twisted is arranged on the precursor yarn barrel, sequentially wound on the upper tension mechanism, the wire guiding mechanism, the lower tension mechanism, the reciprocating yarn guide, the lower roller and the upper roller, and finally wound on the primary twisting bobbin to wind the primary twisted yarn.
Furthermore, the upper tension mechanism comprises a first upper tension rod, a second upper tension rod and a third upper tension rod (a first tension rod, a second tension rod and a third tension rod are sequentially arranged on the left side of the original silk tube, wherein the first tension rod is positioned on the upper left side of the original silk tube, the second tension rod is arranged on the lower left side of the first tension rod, and the third tension rod is arranged on the upper left side of the second tension rod); the wire guiding mechanism is a wire guiding rod.
Furthermore, the roller mechanism comprises an upper roller mechanism, a first lower roller mechanism and a second lower roller mechanism (the first lower roller mechanism and the second lower roller mechanism are positioned on the same horizontal line with the first twist yarn winding drum pipe, and the upper roller is positioned above the right of the first lower roller and above the left of the second lower roller).
Furthermore, the lower tension mechanism comprises a lower tension rod and a plurality of yarn guide wheels sleeved on the lower tension rod.
Furthermore, the godet wheel is a dumbbell-shaped (the middle diameter is smaller, and the two ends are horn-shaped) cylinder, a through hole is formed in the center of the cylinder and penetrates through the inside of the cylinder along the axial direction of the cylinder, and the diameter of the through hole is larger than that of the lower tension rod; the width of the godet wheel is preferably 1.5 cm.
Further, the diameter of the through hole is 1.6 +/-0.1 cm.
Furthermore, the godet wheel is made of wear-resistant plastic or stainless steel materials; the wear-resistant plastic is preferably PEEK plastic, PET plastic, PPS plastic or PC.
The method for producing the primarily twisted yarns by using the primarily twisted yarn production system comprises the following steps: the precursor to be twisted is wound on a precursor bobbin creel, under the driving action of a motor, the precursor is sequentially wound on a yarn guide wheel of an upper tension rod, a yarn guide rod and a lower tension rod forwards, then is wound on a first lower roller, an upper roller and a second lower roller forwards through a reciprocating yarn guide, and finally is wound on a primary twisting bobbin through the second lower roller to obtain primary twisted yarn.
Further, the winding linear speed during the preparation of the twisted yarn is 10-30 m/min.
The primary twisted yarn is produced by the method for producing the primary twisted yarn. The primary-twisted yarn has uniform twist, good bobbin formation, no yarn fuzz, no yarn pasting, no scratch and other abnormalities of the cord, and high strength retention rate (the strength of the aramid primary-twisted yarn is maintained at more than 90%).
Compared with the prior art, the invention has the following positive beneficial effects
The primary twisted yarn produced by the system almost has no burr, the quality of the produced twisted yarn is qualified, the unqualified products are reduced to a great extent, the waste material is avoided, the raw material utilization rate is improved, and the influence of the waste material on the environment is also avoided. The strength of the obtained aramid fiber twisted yarn is also obviously improved to be more than 219N, the strength loss is reduced to be below 8.4 percent, the overall twisting performance is obviously improved, and the using requirement is completely met.
The initial twist yarn which has no burrs and the strength is obviously improved avoids the influence of a large amount of burrs on the cloth surface of the cord fabric prepared in the later period.
Due to the fact that the modulus of the aramid fiber is high, a large amount of primary twisted yarn burrs exist in the aramid fiber twisted yarns produced in the production process in the prior art, the product quality is unqualified, and unevenness of the cloth surface of the cord fabric produced in the later stage can be caused. This application production system has effectively overcome this technical problem, and the aramid fiber of production twists hardly has the production of burr.
Drawings
FIG. 1 is a schematic view of a system for producing aramid fiber cord fabric by first twisting,
FIG. 2 is a second schematic view of a first twist production system of aramid fiber cord fabric,
figure 3 is a schematic view of a lower tension rod with godet wheels,
FIG. 4 is one of the schematic front views of the godet wheel,
figure 5 is a schematic side view of the godet wheel,
figure 6 is a schematic cross-sectional view of a godet wheel,
FIG. 7 is a second schematic front view of the godet wheel,
the symbols in the figures represent: 1 denotes a raw silk tube, 101 denotes raw silk, 2 denotes a first upper tension bar (upper tension bar 1), 3 denotes a second upper tension bar (upper tension bar 2), 4 denotes a third upper tension bar (upper tension bar 3), 5 denotes a yarn guide bar (guide bar), 6 denotes a lower tension bar, 7 denotes a yarn guide wheel, 8 denotes a reciprocating yarn guide, 9 denotes a first lower roller (lower roller 1), 10 denotes an upper roller, 11 denotes a second lower roller (lower roller 2), and 12 denotes a first twist bobbin; 701 denotes a through hole.
Detailed Description
The present invention will be described in more detail with reference to the following embodiments in order to facilitate understanding of the technical aspects of the present invention. But are not intended to limit the scope of the present invention.
The invention provides an aramid fiber cord fabric primary-twist thread production system, which comprises a raw yarn barrel, yarn guide holes, an upper tension mechanism, a yarn guide rod, a lower tension mechanism, a reciprocating yarn guide, a lower roller, an upper roller and a primary-twist bobbin (a primary-twist yarn winding mechanism), wherein the yarn guide holes are arranged on the raw yarn barrel;
the upper tension mechanism comprises a first upper tension rod, a second upper tension rod and a third upper tension rod; the wire guide mechanism is a wire guide rod; the roller mechanism comprises an upper roller mechanism, a first lower roller mechanism and a second lower roller mechanism; the lower tension mechanism comprises a lower tension rod and a plurality of yarn guide wheels which are sleeved on the lower tension rod side by side.
The precursor yarn to be twisted is arranged on a precursor yarn barrel, sequentially wound on a first upper tension rod, a second upper tension rod and a third upper tension rod, sequentially wound on yarn guide wheels of the yarn guide rods and the lower tension rod, sequentially wound on a first lower roller, an upper roller and a second lower roller, (passed through a v-shaped yarn guide, passed through a dried small shrimp screw and a nylon hook, and all parts on a twisting machine well known by technical personnel in the field) and finally wound on a primary-twisted yarn winding drum pipe. The whole system can be driven to move by using a motor which is well known to those skilled in the art as a driving force, the motor is powered by a power supply, and then the primary twisting bobbin is driven to rotate by a transmission shaft. Wherein the upper tension rod, the reciprocating yarn guide, the roller and the motor can be all devices which are well known by the technical personnel in the field.
Furthermore, the godet wheel is a dumbbell-shaped cylinder, a through hole is formed in the center of the cylinder and penetrates through the inside of the cylinder along the axial direction of the cylinder, the diameter of the through hole is larger than that of the lower tension rod, and the diameter of the through hole is 1.6 +/-0.1 cm; the length of each godet wheel is preferably 1.5 cm.
Furthermore, the godet wheel is made of wear-resistant plastic or stainless steel materials; the wear-resistant plastic is preferably PEEK plastic, PET plastic, PPS plastic or PC.
The yarn guide wheel can better avoid the large-amplitude bending of the raw yarn, thereby avoiding the generation of burrs on the raw yarn, ensuring that the twisted yarn prepared in the process has a smooth surface, and obviously improving the strength. The quality of the cord fabric prepared by the twisted yarn is obviously improved.
The godet wheel can also be of various dumbbell-like configurations, as shown in fig. 7.
The invention also provides a method for producing the primary twisted yarn by adopting the system, which comprises the following steps: the protofilament to be twisted is wound on a protofilament barrel, under the driving action of a motor, the protofilament is sequentially wound on a first upper tension rod, a second upper tension rod, a third upper tension rod, a yarn guide rod and a yarn guide wheel of the lower tension rod forwards, then the protofilament passes through a reciprocating yarn guide forwards and is wound on a first lower roller, an upper roller and a second lower roller, and the protofilament is wound on a primary twisting bobbin forwards through a second lower roller to obtain primary twisted yarn. The aramid fiber protofilaments without twist are made into primary twist yarns with the twist of 100t/m-300 t/m.
Wherein the winding linear speed during the preparation of the twisted yarn is 10-30 m/min;
the method specifically comprises the following steps: when the machine is started, the non-twist aramid fiber precursor is made into a primary twist yarn with the twist of 100t/m-300t/m through the matching of a spindle with a certain rotating speed (3000 plus one revolution/minute), an oil storage type steel collar which can lift up and down (top and bottom 355mm reciprocating) and a lower roller which actively feeds the yarn.
The twisted yarn prepared by the method has uniform twist, good bobbin forming, no yarn breakage, no pasting, no scratch and other abnormalities of the cord, high strength retention rate (the strength of aramid fiber primary twisted yarn is kept above 90%), more than 219N and strength loss reduced to below 8.4%.
The production of yarn twisting burrs is well avoided, the problem that the yarn twisting burrs exist in the field is innovatively solved, the product with qualified quality is prepared, and meanwhile, the quality of the cord fabric prepared by the cord fabric is improved.
Claims (10)
1. An aramid fiber cord fabric primary-twist line production system is characterized by comprising a raw yarn barrel, an upper tension mechanism, a wire guiding mechanism, a lower tension mechanism, a reciprocating yarn guide, a lower roller, an upper roller and a primary-twist bobbin;
the protofilament to be twisted is arranged on the protofilament barrel, sequentially wound on the upper tension mechanism, the wire guiding mechanism, the lower tension mechanism, the reciprocating wire guide, the lower roller and the upper roller, and finally wound on the primary twisting bobbin.
2. The aramid fiber cord fabric first-twist line production system according to claim 1, wherein the upper tension mechanism comprises a first upper tension rod, a second upper tension rod and a third upper tension rod; the wire guiding mechanism is a wire guiding rod.
3. The aramid fiber cord fabric primary twist line production system according to claim 1, wherein the roller mechanism includes an upper roller mechanism, a first lower roller mechanism and a second lower roller mechanism.
4. The aramid fiber cord fabric first-twist production system according to claims 1 to 3, wherein the lower tension mechanism includes a lower tension rod and a plurality of godet rollers sleeved on the lower tension rod.
5. The aramid fiber cord fabric primary-twist production system of claim 4, wherein the godet roller is a dumbbell-shaped cylinder, a through hole is formed in the center of the cylinder and penetrates through the inside of the cylinder along the axial direction of the cylinder, and the diameter of the through hole is larger than that of the lower tension rod; the length of each godet wheel is preferably 1.5 cm.
6. The aramid fiber cord fabric primary twist line production system according to claim 4, wherein the diameter of the through hole is 1.6 ± 0.1 cm.
7. The aramid fiber cord fabric primary-twist production system as claimed in claim 5 or 6, wherein the godet is made of wear-resistant plastic or stainless steel material; the wear-resistant plastic is preferably PEEK plastic, PET plastic, PPS plastic or PC.
8. A method for producing a first twisted wire by using the first twisted wire production system according to any one of claims 1 to 7, characterized by comprising the steps of: the protofilament to be twisted is wound on a protofilament barrel, under the driving action of a motor, the protofilament is sequentially wound on a godet wheel of an upper tension rod, a godet rod and a lower tension rod forwards, then is wound on a first lower roller, an upper roller and a second lower roller forwards through a reciprocating yarn guide, and finally is wound on a primary twist bobbin through the second lower roller to obtain primary twist yarn.
9. The method as claimed in claim 8, wherein the twisted yarn is produced at a winding line speed of 10 to 30 m/min.
10. A first-twisted yarn produced by the method of claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010723628.XA CN111996626B (en) | 2020-07-24 | 2020-07-24 | Production system and production method of aramid fiber cord fabric primary twisted yarn |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010723628.XA CN111996626B (en) | 2020-07-24 | 2020-07-24 | Production system and production method of aramid fiber cord fabric primary twisted yarn |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111996626A true CN111996626A (en) | 2020-11-27 |
| CN111996626B CN111996626B (en) | 2023-01-24 |
Family
ID=73468052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010723628.XA Active CN111996626B (en) | 2020-07-24 | 2020-07-24 | Production system and production method of aramid fiber cord fabric primary twisted yarn |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111996626B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08277067A (en) * | 1995-04-10 | 1996-10-22 | Murata Mach Ltd | Fuzz suppressing device |
| JP2008240204A (en) * | 2007-03-28 | 2008-10-09 | Murata Mach Ltd | Fluff-reducing apparatus for yarn twister |
| KR20090114545A (en) * | 2008-04-30 | 2009-11-04 | 주식회사 코오롱 | Method of manufacturing aramid raw cord |
| CN102206885A (en) * | 2011-05-19 | 2011-10-05 | 上海市毛麻纺织科学技术研究所 | Polysulfonamide core-spun and wrapped composite yarns and conditioning friction tight composite spinning device thereof |
| CN102586961A (en) * | 2011-01-10 | 2012-07-18 | 江苏海阳化纤有限公司 | Direct twisting machine |
| CN202755138U (en) * | 2012-07-24 | 2013-02-27 | 中钢集团吉林炭素股份有限公司 | Precursor fiber protective device |
| CN103820908A (en) * | 2014-03-12 | 2014-05-28 | 江苏绿材谷新材料科技发展有限公司 | Method and device for eliminating twist of fiber strand |
| CN106012166A (en) * | 2016-06-29 | 2016-10-12 | 江南大学 | Sirofil core-spun yarn production device and production method |
| CN107916472A (en) * | 2017-12-06 | 2018-04-17 | 湖南中泰特种装备有限责任公司 | A kind of online twisted filaments device and method |
| CN109576836A (en) * | 2019-01-16 | 2019-04-05 | 河南光远新材料股份有限公司 | A kind of doubler twister yarn guide member |
| CN209584457U (en) * | 2019-02-22 | 2019-11-05 | 吴江市俊达织造有限责任公司 | A kind of guide wire in two-for-one twister |
| CN210001990U (en) * | 2019-02-11 | 2020-01-31 | 桐乡市龙琪纺织有限公司 | multi-strand twisting machine with self-adjusting tension |
-
2020
- 2020-07-24 CN CN202010723628.XA patent/CN111996626B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08277067A (en) * | 1995-04-10 | 1996-10-22 | Murata Mach Ltd | Fuzz suppressing device |
| JP2008240204A (en) * | 2007-03-28 | 2008-10-09 | Murata Mach Ltd | Fluff-reducing apparatus for yarn twister |
| KR20090114545A (en) * | 2008-04-30 | 2009-11-04 | 주식회사 코오롱 | Method of manufacturing aramid raw cord |
| CN102586961A (en) * | 2011-01-10 | 2012-07-18 | 江苏海阳化纤有限公司 | Direct twisting machine |
| CN102206885A (en) * | 2011-05-19 | 2011-10-05 | 上海市毛麻纺织科学技术研究所 | Polysulfonamide core-spun and wrapped composite yarns and conditioning friction tight composite spinning device thereof |
| CN202755138U (en) * | 2012-07-24 | 2013-02-27 | 中钢集团吉林炭素股份有限公司 | Precursor fiber protective device |
| CN103820908A (en) * | 2014-03-12 | 2014-05-28 | 江苏绿材谷新材料科技发展有限公司 | Method and device for eliminating twist of fiber strand |
| CN106012166A (en) * | 2016-06-29 | 2016-10-12 | 江南大学 | Sirofil core-spun yarn production device and production method |
| CN107916472A (en) * | 2017-12-06 | 2018-04-17 | 湖南中泰特种装备有限责任公司 | A kind of online twisted filaments device and method |
| CN109576836A (en) * | 2019-01-16 | 2019-04-05 | 河南光远新材料股份有限公司 | A kind of doubler twister yarn guide member |
| CN210001990U (en) * | 2019-02-11 | 2020-01-31 | 桐乡市龙琪纺织有限公司 | multi-strand twisting machine with self-adjusting tension |
| CN209584457U (en) * | 2019-02-22 | 2019-11-05 | 吴江市俊达织造有限责任公司 | A kind of guide wire in two-for-one twister |
Non-Patent Citations (2)
| Title |
|---|
| 王妍卫 等: "降低锦纶66帘线强力损失的设备改进措施", 《轮胎工业》 * |
| 辽宁省大连海洋渔业总公司志编纂委员会: "《辽鱼志》", 31 December 1990, 沈阳出版社 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111996626B (en) | 2023-01-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4568912B2 (en) | Isotropic pitch-based carbon fiber spun yarn, composite yarn and fabric using the same, and production method thereof | |
| CN102713032B (en) | Polyester monofilament package | |
| CN101245510B (en) | Direct twisting type twisting technique | |
| CN102330235B (en) | Spinning method and device for symmetrically covering rigid fiber filament by short fiber bundles | |
| CN107916483B (en) | Spinning method of wrapped composite yarn and equipment adopting method | |
| CN111979624A (en) | High-rigidity brittle fiber material nondestructive cladding yarn and spinning method and fabric thereof | |
| CN112209166A (en) | Production process and equipment of large-circle bread yarn | |
| US3769787A (en) | Compact multi-filament textile yarn and method of making the same | |
| CN201031098Y (en) | Novel skein reeling machine yarn guide device | |
| CN111996626B (en) | Production system and production method of aramid fiber cord fabric primary twisted yarn | |
| CN213327989U (en) | Composite twisting device for textile yarns | |
| CN109056395A (en) | A kind of endless rope machine and its working method | |
| CN109837626B (en) | Stranded oilless chinlon 6DTY, production process thereof and elasticizer for realizing production process | |
| CN103572534A (en) | Yarn dyeing bobbin and method for manufacturing ultrafine cotton yarns by aid of yarn dyeing bobbin | |
| CN215887364U (en) | Forced dehairing device for ring spinning yarn | |
| US2139449A (en) | Method and apparatus for producing artificial thread | |
| CN2898066Y (en) | False twister with air-coating function | |
| CN108456963A (en) | Rove item/endless tow composite yarn with drawn expanded performance and its manufacturing method | |
| CN210294621U (en) | Threaded optical cable reinforcing core and processing production line thereof | |
| CN109778575B (en) | High-strength and light-weight steel wire composite rope core for elevator and preparation method thereof | |
| CN201777728U (en) | Winding equalizing device | |
| CN111395022A (en) | Light high-strength multi-core composite structure rope core and production method thereof | |
| CN219603782U (en) | Twisting texturing machine for fabric production | |
| CN113737348B (en) | Fiber untwisting and shaping device, preparation device and method | |
| JPS60128169A (en) | Method of taking up polyamide fiber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |