CN102560714A - PTFE (Polytetrafluoroethylene) low-shrinkage crimped chopped fiber for filter needled-punched felt and manufacturing method of PTFE low-shrinkage crimped chopped fiber - Google Patents
PTFE (Polytetrafluoroethylene) low-shrinkage crimped chopped fiber for filter needled-punched felt and manufacturing method of PTFE low-shrinkage crimped chopped fiber Download PDFInfo
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- CN102560714A CN102560714A CN2010106055194A CN201010605519A CN102560714A CN 102560714 A CN102560714 A CN 102560714A CN 2010106055194 A CN2010106055194 A CN 2010106055194A CN 201010605519 A CN201010605519 A CN 201010605519A CN 102560714 A CN102560714 A CN 102560714A
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Abstract
The invention discloses a PTFE (Polytetrafluoroethylene) low-shrinkage crimped chopped fiber for a filter needled-punched felt and a manufacturing method of the PTFE low-shrinkage crimped chopped fiber. The manufacturing method comprises the following steps of: preparing, mixing, fueling, curing, compacting, extruding, calendaring, rolling, depositing, unreeling, deoiling, sintering, drafting, film-splitting, carding, high-strength variable-speed crimping, hot-air oven sizing, natural annealing of air and cutting-off. According to the invention, by the adoption of the low shrinkage which is achieved after the mechanical crimping under a thermal state and the thermoforming of fibers, the cohesive force among the fibers is enhanced, and thus convenience is provided for the carding and the felting of a rear channel.
Description
Technical field
The present invention relates to make environmental protection and filter the functional manufacturing approach of Nomex with polytetrafluoroethylene fibre.
Background technology
Polytetrafluoroethylene (PTFE) staple fiber material is widely used in making Nomex as filtering material in recent years.Needled filtering felt is that bag-type dusting filters the critical component in (solid and gas separation).The polytetrafluoroethylene fibre material because of its have temperature tolerance (190 ℃-260 ℃) extensively, resistance to chemical attack, resistance to oxidation, work condition environment adaptability is strong, function is excellent, has vast market prospect.But because PTFE belongs to the supra polymer polymer, strand does not have a plane saw point type conformation, and shape conformation (like Fig. 1) in the shape of a spiral.Therefore it has lowest friction coefficient simultaneously; High not adhesiveness and self-cleaning property; Cause in carding process the cohesive force between the fiber and fiber on the weak side, the combing lapping is irregular, become the net difficulty, and it is on the low side to become behind the felt hook between the fiber and base cloth to scratch power; And the Nomex thickness is differed, powerful on the low side.Secondly the PTFE thermal coefficient of expansion is bigger than normal relatively, and thermal conductance is on the low side, the polytetrafluoroethylene fibre that adopts split film process to produce; Under the drawing-off state that is heated continuously, the elasticity flow is bigger, behind the synnema cutting short-forming fiber; There are the unsettled phenomenons of physical property such as the fiber shrinkage is bigger, cause the filtrate back place creep phenomenon of in use being heated, produce expand bag and friction back and produce bag and decrease; Particularly poor because of its cohesive force; When combing 100%PTFE fiber, need modified device, and spray heavy dose of silicone oil, peregal auxiliary agents such as " 0 ".These means cause carding efficiency on the low side, and fibre agglomerates produces irreversible quality problems such as card nailing neps, and therefore it restricted filtrate enterprise selecting for use this excellent fibrous material of PTFE.
Summary of the invention
The object of the invention is exactly to overcome the deficiency that prior art exists, and provides a kind of cohesive force strong, and the fiber shrinkage is less, and the filtration Nomex of stable physical property is with curling staple fiber of the low shrinkage of polytetrafluoroethylene (PTFE) and manufacturing approach thereof.
For achieving the above object, technical scheme of the present invention is following:
Filter Nomex with the curling staple fiber of the low shrinkage of polytetrafluoroethylene (PTFE), it is that manufacturing forms through following steps:
1. the raw material polytetrafluoroethylgranule granule is crossed 40 mesh sieves, add the extrusion aid of 15-20%, deposit slaking, curing temperature is 30 ℃-40 ℃;
2. the polytetrafluoroethylene (PTFE) with slaking adds the column type mold, and precompressed becomes base, sets 6-10kg/cm
2Pressure, pressed compact speed 5-15cm/min guarantees that material base is closely knit, does not have disconnected base, and the air in the raw material is discharged fully;
3. material base is inserted pressurizing unit, utilize the frequency conversion oil gear to extrude the slice with certain continuous length, slice gets into the calender calendering after boiling water soaks; The film forming width is 12-15cm; Thickness is the raw material band of 0.1mm, rolling temperature 50-90 ℃, and rolling velocity 10-15m/min;
4. weak power drawing-off and baking oven bake oil removing, 270 ℃-300 ℃ of temperature, speed 8-10m/min;
5. in a continuous manner to oil removing strip sintering, 330 ℃-390 ℃ of sintering temperatures obtain width 4-6cm, the slaking film of thickness 0.02-0.04mm after drawing-off;
6. acupuncture, split film, rolling after the carding machine combing;
7. curl:
(1) fiber with the rolling boundling curls after 50 ℃-100 ℃ hot water storgae immersion.
(2) PTFE is progressively transformed to the I crystal formation by the IV crystal formation in the time of 19 ℃, and very big line expansion will take place the PTFE goods changes, and requires operating temperature must avoid 19 ℃ of crystal formation inversion points;
When (3) PTFE curled, pressure was at 2.1MPa-4MPa before the pressure roller.
(4) draw off rate to obtain stable not of uniform size curling, guarantees the bigger coefficient of friction between the fiber with random variable motion between the 3-30m/min, surpasses 30 meters then instabilities.
8. HEAT SETTING: the crimped fibre bundle is deposited in the rustless steel container, placed hot-air seasoning in the baking oven, setting temperature 250-300 ℃, be higher than 300 ℃ and be prone to make fiber flavescence, shaping time 6-8 hour because of the contact temperature is too high;
9. slow cooling: the fiber containers that will pass through HEAT SETTING places cooling naturally under the quiet wind state, and be 8-12 hour general cool time, thoroughly, obtains higher degree of crystallinity with slow cooling to guarantee cooling;
10. cooled fibers is cut into as required the staple fiber of 38-102mm length.
It is following with the manufacturing approach of the curling staple fiber of the low shrinkage of polytetrafluoroethylene (PTFE) to filter Nomex:
1. the raw material polytetrafluoroethylgranule granule is crossed 40 mesh sieves, add the extrusion aid of 15-20%, deposit slaking, curing temperature is 30 ℃-40 ℃;
2. the polytetrafluoroethylene (PTFE) with slaking adds the column type mold, and precompressed becomes base, sets 6-10kg/cm
2Pressure, pressed compact speed 5-15cm/min guarantees that material base is closely knit, does not have disconnected base, and the air in the raw material is discharged fully;
3. material base is inserted pressurizing unit, utilize the frequency conversion oil gear to extrude the slice with certain continuous length, slice gets into the calender calendering after boiling water soaks; The film forming width is 12-15cm; Thickness is the raw material band of 0.1mm, rolling temperature 50-90 ℃, and rolling velocity 10-15m/min;
4. weak power drawing-off and baking oven bake oil removing, 270 ℃-300 ℃ of temperature, speed 8-10m/min;
5. in a continuous manner to oil removing strip sintering, 330 ℃-390 ℃ of sintering temperatures obtain width 4-6cm, the slaking film of thickness 0.02-0.04mm after drawing-off;
6. acupuncture, split film, rolling after the carding machine combing;
7. curl:
(1) fiber with the rolling boundling curls after 50 ℃-100 ℃ hot water storgae immersion.
(2) PTFE is progressively transformed to the I crystal formation by the IV crystal formation in the time of 19 ℃, and very big line expansion will take place the PTFE goods changes, and requires operating temperature must avoid 19 ℃ of crystal formation inversion points;
When (3) PTFE curled, pressure was at 2.1MPa-4MPa before the pressure roller.
(4) draw off rate to obtain stable not of uniform size curling, guarantees the bigger coefficient of friction between the fiber with random variable motion between the 3-30m/min, surpasses 30 meters then instabilities.
8. HEAT SETTING: the crimped fibre bundle is deposited in the rustless steel container, placed hot-air seasoning in the baking oven, setting temperature 250-300 ℃, be higher than 300 ℃ and be prone to make fiber flavescence, shaping time 6-8 hour because of the contact temperature is too high;
9. slow cooling: the fiber containers that will pass through HEAT SETTING places cooling naturally under the quiet wind state, and be 8-12 hour general cool time, thoroughly, obtains higher degree of crystallinity with slow cooling to guarantee cooling;
10. cooled fibers is cut into as required the staple fiber of 38-102mm length.
Low shrinkage crimpiness polytetrafluoroethylene fibre is the functional product that improves of polytetrafluoroethylene fibre, in fiber manufacture process, through the machine crimp technology under the hot state; Make it under heat expands state, obtain fiber crimp, cooling back normal temperature forms stable helical form down and curls, and increases its coefficient of friction; It is flexible to improve cohesive force and the hook in acupuncture course of fiber in carding process; Utilize PTFE to have good hot stability simultaneously, the fiber after short the cutting makes the fiber longitudinal stress obtain discharging simultaneously under hot state through the curly form of the further firm fiber of HEAT SETTING of proper temperature; The elasticity flow is better recovered; Reach the purpose of stable fibers physical property, combing is improved, can improve the thickness uniformity of Nomex and the ventilative uniformity of filter bag effectively; And improve row yielding in process of production, reduce consuming.This functional change can not lost the useful characteristic that any polytetrafluoroethylene (PTFE) has because of technique change, and except that certain working procedure is carried out term restriction and the technological requirement, other operation does not change because of the application of present technique.
The low shrinkage that present technique reaches after adopting the HEAT SETTING of machine crimp and fiber under the hot state to handle strengthens cohesive force between the fiber and is convenient to back road combing and becomes felt.
PTFE shrinks 2% when 23 ℃ drop to-196 ℃, expand 4% during from 23 ℃ to 249 ℃, at 19 ℃ crystal transfer point PTFE very big line expansion can take place and change.
Humid tropical condition between present technique adopts 50-100 ℃ curls, and this moment, linear expansion coefficient was 12.4 the most stable;
Present technique supports the PTFE goods in operating process, to avoid 19 ℃ crystal transfer point;
The present technique support is higher than 249 ℃ HEAT SETTING, adopts 250 ℃ of-300 ℃ of baking oven hot blast HEAT SETTINGs, obtaining the PTFE fiber of low shrinkage, is prone to make the fiber flavescence because of the contact temperature is too high if be higher than 300 ℃;
The machine crimp linear velocity that present technique adopts is 3-30m/min and variable motion;
Present technique adopts than curling to obtain high-intensity curling greater than the big pressure of 2.1MPa before the static;
Naturally the method for cooling off after the HEAT SETTING of present technique support baking oven obtains the stable crimped fibre of high-crystallinity with the slow cooling method.
The invention has the beneficial effects as follows:
Because the functional change of low shrinkage crimped fibre, the variation of the random tooth pitch of zigzag has strengthened interfibrous cohesive force, and the hook in carding process between the fiber is flexible to be strengthened with lack of alignment; Die is peeled off the back and is become net property better, and the thickness degree is even, and the variation of the high pressure of preference temperature is simultaneously curled; Obtained the polytetrafluoroethylene fibre of low shrinkage after the hot blast typing; After acupuncture became felt, size was more stable in the course of work, had reduced the risk of the broken bag of bag that contracts; Improved the work service life of filter bag; Particularly irregular because of having overcome the lapping that causes because of cohesive force is low, guaranteed the good thickness uniformity and the ventilative uniformity of felt, improved the strainability of filtrate.
This patent application and the patent No. are CN200610026649; The patent of invention of the relevant polytetrafluoroethylene fibre manufacturing of CN200510053046 and ZL95193797 is compared; These three patents only relate to the manufacturing of general polytetrafluoroethylene fibre, do not relate to the functional improvement problem of the curling and low shrinkage of fiber, though basic the manufacturing on the link similarity is being arranged; But this invention has tangible improvement support: at first, present technique adopts the method that the high pressure speed change is curled under the humid tropical condition; The second, heat setting temperature made clearly define, to be higher than 249 ℃ of hot-air ovens typings that are lower than 300 ℃, to curl to obtain stable random fiber, it is bad that temperature is lower than 250 ℃ of fastness of then curling, and is higher than 300 ℃ and is prone to make fiber because of the too high flavescence of contact temperature; The 3rd, present technique has clearly been stipulated the polyflon product in operating process, avoids 19 ℃ crystal transfer point; The 4th, after present technique explicitly calls for HEAT SETTING, with the method for natural slow cooling fiber with the low shrinkage that obtains high-crystallinity, more than to the functional improvement of polytetrafluoroethylene (PTFE), improve row yielding, have great contribution.
The specific embodiment
Below in conjunction with specific embodiment the present invention is carried out labor;
Embodiment
Manufacture process of the present invention is following
Preparation → batch mixing → oiling → slaking → pressed compact → extrusion → calendering → rolling → deposit → unreel → oil removing → sintering → drawing-off → splitting film → combing → high-tenacity speed change curls → hot-air oven typing → air nature slow cooling → cut-out.
Filter Nomex with the curling staple fiber of the low shrinkage of polytetrafluoroethylene (PTFE), it is that manufacturing forms through following steps:
1. the raw material polytetrafluoroethylgranule granule is crossed 40 mesh sieves, add the extrusion aid of 15-20%, deposit slaking, curing temperature is 30 ℃-40 ℃;
2. the polytetrafluoroethylene (PTFE) with slaking adds the column type mold, and precompressed becomes base, sets 6-10kg/cm
2Pressure, pressed compact speed 5-15cm/min guarantees that material base is closely knit, does not have disconnected base, and the air in the raw material is discharged fully;
3. material base is inserted pressurizing unit, utilize the frequency conversion oil gear to extrude the slice with certain continuous length, slice gets into the calender calendering after boiling water soaks; The film forming width is 12-15cm; Thickness is the raw material band of 0.1mm, rolling temperature 50-90 ℃, and rolling velocity 10-15m/min;
4. weak power drawing-off and baking oven bake oil removing, 270 ℃-300 ℃ of temperature, speed 8-10m/min;
5. in a continuous manner to oil removing strip sintering, 330 ℃-390 ℃ of sintering temperatures obtain width 4-6cm, the slaking film of thickness 0.02-0.04mm after drawing-off;
6. acupuncture, split film, rolling after the carding machine combing;
7. curl:
(1) fiber with the rolling boundling curls after 50 ℃-100 ℃ hot water storgae immersion.
(2) PTFE is progressively transformed to the I crystal formation by the IV crystal formation in the time of 19 ℃, and very big line expansion will take place the PTFE goods changes, and requires operating temperature must avoid 19 ℃ of crystal formation inversion points;
When (3) PTFE curled, pressure was at 2.1MPa-4MPa before the pressure roller.
(4) draw off rate to obtain stable not of uniform size curling, guarantees the bigger coefficient of friction between the fiber with random variable motion between the 3-30m/min, surpasses 30 meters then instabilities.
8. HEAT SETTING: the crimped fibre bundle is deposited in the rustless steel container, placed hot-air seasoning in the baking oven, setting temperature 250-300 ℃, be higher than 300 ℃ and be prone to make fiber flavescence, shaping time 6-8 hour because of the contact temperature is too high;
9. slow cooling: the fiber containers that will pass through HEAT SETTING places cooling naturally under the quiet wind state, and be 8-12 hour general cool time, thoroughly, obtains higher degree of crystallinity with slow cooling to guarantee cooling;
10. cooled fibers is cut into as required the staple fiber of 38-102mm length.
It is following with the manufacturing approach of the curling staple fiber of the low shrinkage of polytetrafluoroethylene (PTFE) to filter Nomex:
1. the raw material polytetrafluoroethylgranule granule is crossed 40 mesh sieves, add the extrusion aid of 15-20%, deposit slaking, curing temperature is 30 ℃-40 ℃;
2. the polytetrafluoroethylene (PTFE) with slaking adds the column type mold, and precompressed becomes base, sets 6-10kg/cm
2Pressure, pressed compact speed 5-15cm/min guarantees that material base is closely knit, does not have disconnected base, and the air in the raw material is discharged fully;
3. material base is inserted pressurizing unit, utilize the frequency conversion oil gear to extrude the slice with certain continuous length, slice gets into the calender calendering after boiling water soaks; The film forming width is 12-15cm; Thickness is the raw material band of 0.1mm, rolling temperature 50-90 ℃, and rolling velocity 10-15m/min;
4. weak power drawing-off and baking oven bake oil removing, 270 ℃-300 ℃ of temperature, speed 8-10m/min;
5. in a continuous manner to oil removing strip sintering, 330 ℃-390 ℃ of sintering temperatures obtain width 4-6cm, the slaking film of thickness 0.02-0.04mm after drawing-off;
6. acupuncture, split film, rolling after the carding machine combing;
7. curl:
(1) fiber with the rolling boundling curls after 50 ℃-100 ℃ hot water storgae immersion.
(2) PTFE is progressively transformed to the I crystal formation by the IV crystal formation in the time of 19 ℃, and very big line expansion will take place the PTFE goods changes, and requires operating temperature must avoid 19 ℃ of crystal formation inversion points;
When (3) PTFE curled, pressure was at 2.1MPa-4MPa before the pressure roller.
(4) draw off rate to obtain stable not of uniform size curling, guarantees the bigger coefficient of friction between the fiber with random variable motion between the 3-30m/min, surpasses 30 meters then instabilities.
8. HEAT SETTING: the crimped fibre bundle is deposited in the rustless steel container, placed hot-air seasoning in the baking oven, setting temperature 250-300 ℃, be higher than 300 ℃ and be prone to make fiber flavescence, shaping time 6-8 hour because of the contact temperature is too high;
9. slow cooling: the fiber containers that will pass through HEAT SETTING places cooling naturally under the quiet wind state, and be 8-12 hour general cool time, thoroughly, obtains higher degree of crystallinity with slow cooling to guarantee cooling;
10. cooled fibers is cut into as required the staple fiber of 38-102mm length.
Claims (2)
1. filter Nomex with the curling staple fiber of the low shrinkage of polytetrafluoroethylene (PTFE), it is characterized in that it is that manufacturing forms through following steps:
One, the raw material polytetrafluoroethylgranule granule is crossed 40 mesh sieves, add the extrusion aid of 15-20%, deposit slaking, curing temperature is 30 ℃-40 ℃;
Two, the polytetrafluoroethylene (PTFE) with slaking adds the column type mold, and precompressed becomes base, sets 6-10kg/cm
2Pressure, pressed compact speed 5-15cm/min guarantees that material base is closely knit, does not have disconnected base, and the air in the raw material is discharged fully;
Three, material base is inserted pressurizing unit, utilize the frequency conversion oil gear to extrude the slice with certain continuous length, slice gets into the calender calendering after boiling water soaks; The film forming width is 12-15cm; Thickness is the raw material band of 0.1mm, rolling temperature 50-90 ℃, and rolling velocity 10-15m/min;
Four, weak power drawing-off and baking oven bake oil removing, 270 ℃-300 ℃ of temperature, speed 8-10m/min;
Five, in a continuous manner to oil removing strip sintering, 330 ℃-390 ℃ of sintering temperatures obtain width 4-6cm, the slaking film of thickness 0.02-0.04mm after drawing-off;
Six, acupuncture, split film, rolling after the carding machine combing;
Seven, curl:
(1) fiber with the rolling boundling curls after 50 ℃-100 ℃ hot water storgae immersion.
(2) PTFE is progressively transformed to the I crystal formation by the IV crystal formation in the time of 19 ℃, and very big line expansion will take place the PTFE goods changes, and requires operating temperature must avoid 19 ℃ of crystal formation inversion points;
When (3) PTFE curled, pressure was at 2.1MPa-4MPa before the pressure roller.
(4) draw off rate to obtain stable not of uniform size curling, guarantees the bigger coefficient of friction between the fiber with random variable motion between the 3-30m/min, surpasses 30 meters then instabilities.
Eight, HEAT SETTING: the crimped fibre bundle is deposited in the rustless steel container, placed hot-air seasoning in the baking oven, setting temperature 250-300 ℃, be higher than 300 ℃ and be prone to make fiber flavescence, shaping time 6-8 hour because of the contact temperature is too high;
Nine, slow cooling: the fiber containers that will pass through HEAT SETTING places cooling naturally under the quiet wind state, and be 8-12 hour general cool time, thoroughly, obtains higher degree of crystallinity with slow cooling to guarantee cooling;
Ten, cooled fibers is cut into as required the staple fiber of 38-102mm length.
2. filter the manufacturing approach of Nomex with the curling staple fiber of the low shrinkage of polytetrafluoroethylene (PTFE), its step is following:
One, the raw material polytetrafluoroethylgranule granule is crossed 40 mesh sieves, add the extrusion aid of 15-20%, deposit slaking, curing temperature is 30 ℃-40 ℃;
Two, the polytetrafluoroethylene (PTFE) with slaking adds the column type mold, and precompressed becomes base, sets 6-10kg/cm
2Pressure, pressed compact speed 5-15cm/min guarantees that material base is closely knit, does not have disconnected base, and the air in the raw material is discharged fully;
Three, material base is inserted pressurizing unit, utilize the frequency conversion oil gear to extrude the slice with certain continuous length, slice gets into the calender calendering after boiling water soaks; The film forming width is 12-15cm; Thickness is the raw material band of 0.1mm, rolling temperature 50-90 ℃, and rolling velocity 10-15m/min;
Four, weak power drawing-off and baking oven bake oil removing, 270 ℃-300 ℃ of temperature, speed 8-10m/min;
Five, in a continuous manner to oil removing strip sintering, 330 ℃-390 ℃ of sintering temperatures obtain width 4-6cm, the slaking film of thickness 0.02-0.04mm after drawing-off;
Six, acupuncture, split film, rolling after the carding machine combing;
Seven, curl:
(1) fiber with the rolling boundling curls after 50 ℃-100 ℃ hot water storgae immersion.
(2) PTFE is progressively transformed to the I crystal formation by the IV crystal formation in the time of 19 ℃, and very big line expansion will take place the PTFE goods changes, and requires operating temperature must avoid 19 ℃ of crystal formation inversion points;
When (3) PTFE curled, pressure was at 2.1MPa-4MPa before the pressure roller.
(4) draw off rate to obtain stable not of uniform size curling, guarantees the bigger coefficient of friction between the fiber with random variable motion between the 3-30m/min, surpasses 30 meters then instabilities.
Eight, HEAT SETTING: the crimped fibre bundle is deposited in the rustless steel container, placed hot-air seasoning in the baking oven, setting temperature 250-300 ℃, be higher than 300 ℃ and be prone to make fiber flavescence, shaping time 6-8 hour because of the contact temperature is too high;
Nine, slow cooling: the fiber containers that will pass through HEAT SETTING places cooling naturally under the quiet wind state, and be 8-12 hour general cool time, thoroughly, obtains higher degree of crystallinity with slow cooling to guarantee cooling;
Ten, cooled fibers is cut into as required the staple fiber of 38-102mm length.
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| CN2010106055194A CN102560714A (en) | 2010-12-27 | 2010-12-27 | PTFE (Polytetrafluoroethylene) low-shrinkage crimped chopped fiber for filter needled-punched felt and manufacturing method of PTFE low-shrinkage crimped chopped fiber |
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|---|---|---|---|
| CN2010106055194A CN102560714A (en) | 2010-12-27 | 2010-12-27 | PTFE (Polytetrafluoroethylene) low-shrinkage crimped chopped fiber for filter needled-punched felt and manufacturing method of PTFE low-shrinkage crimped chopped fiber |
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Cited By (7)
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| CN103320880A (en) * | 2013-05-13 | 2013-09-25 | 吉林省华纺纤维制造有限公司 | Preparation method for oil-free polypropylene staple fibers with static electricity |
| CN105133064A (en) * | 2015-08-31 | 2015-12-09 | 江苏泓彦塑料制品有限公司 | Preparation method for PTFE short fiber |
| CN106637451A (en) * | 2016-12-27 | 2017-05-10 | 常州市兴诚高分子材料有限公司 | Method for preparing polytetrafluoroethylene microfibers |
| CN106757791A (en) * | 2016-12-30 | 2017-05-31 | 青岛大学 | Non-woven fabric and its preparation technology based on polytetrafluoroethylene film |
| CN109943897A (en) * | 2019-04-04 | 2019-06-28 | 上海灵氟隆膜技术有限公司 | A kind of preparation method of the polytetrafluoroethylene fibre with how ultra-fine branched structure |
| CN113026130A (en) * | 2021-03-09 | 2021-06-25 | 山东森荣新材料股份有限公司 | Preparation method of polytetrafluoroethylene superfine short fiber |
| CN113122942A (en) * | 2021-03-16 | 2021-07-16 | 苏州大学 | Large-scale preparation method of low-shrinkage polytetrafluoroethylene filaments |
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| CN101805958A (en) * | 2009-02-13 | 2010-08-18 | 常州市东新华福氟塑材料有限公司 | Polytetrafluoroethylene punched felt and manufacturing method thereof |
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| JPH11104418A (en) * | 1997-10-06 | 1999-04-20 | Toyobo Co Ltd | Felt for high temperature filter dust collection and its manufacture |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103320880A (en) * | 2013-05-13 | 2013-09-25 | 吉林省华纺纤维制造有限公司 | Preparation method for oil-free polypropylene staple fibers with static electricity |
| CN103320880B (en) * | 2013-05-13 | 2015-07-22 | 吉林省华纺纤维制造有限公司 | Preparation method for oil-free polypropylene staple fibers with static electricity |
| CN105133064A (en) * | 2015-08-31 | 2015-12-09 | 江苏泓彦塑料制品有限公司 | Preparation method for PTFE short fiber |
| CN105133064B (en) * | 2015-08-31 | 2017-06-20 | 江苏泓彦塑料科技有限公司 | A kind of preparation method of PTFE chopped fibers |
| CN106637451A (en) * | 2016-12-27 | 2017-05-10 | 常州市兴诚高分子材料有限公司 | Method for preparing polytetrafluoroethylene microfibers |
| CN106757791A (en) * | 2016-12-30 | 2017-05-31 | 青岛大学 | Non-woven fabric and its preparation technology based on polytetrafluoroethylene film |
| CN106757791B (en) * | 2016-12-30 | 2021-09-03 | 青岛大学 | Novel non-woven fabric based on polytetrafluoroethylene film and preparation process thereof |
| CN109943897A (en) * | 2019-04-04 | 2019-06-28 | 上海灵氟隆膜技术有限公司 | A kind of preparation method of the polytetrafluoroethylene fibre with how ultra-fine branched structure |
| CN113026130A (en) * | 2021-03-09 | 2021-06-25 | 山东森荣新材料股份有限公司 | Preparation method of polytetrafluoroethylene superfine short fiber |
| CN113026130B (en) * | 2021-03-09 | 2022-08-02 | 山东森荣新材料股份有限公司 | Preparation method of polytetrafluoroethylene superfine short fiber |
| CN113122942A (en) * | 2021-03-16 | 2021-07-16 | 苏州大学 | Large-scale preparation method of low-shrinkage polytetrafluoroethylene filaments |
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Application publication date: 20120711 |