WO2000052238A1 - Procede de fabrication de filaments, notamment de filaments de ptfe, et installation destinee a la mise en oeuvre ledit procede - Google Patents

Procede de fabrication de filaments, notamment de filaments de ptfe, et installation destinee a la mise en oeuvre ledit procede Download PDF

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Publication number
WO2000052238A1
WO2000052238A1 PCT/BR2000/000016 BR0000016W WO0052238A1 WO 2000052238 A1 WO2000052238 A1 WO 2000052238A1 BR 0000016 W BR0000016 W BR 0000016W WO 0052238 A1 WO0052238 A1 WO 0052238A1
Authority
WO
WIPO (PCT)
Prior art keywords
strip
stretching
filaments
process according
fact
Prior art date
Application number
PCT/BR2000/000016
Other languages
English (en)
Inventor
Luigi Biancheri
Original Assignee
Manegro Administração E Participações Ltda.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Manegro Administração E Participações Ltda. filed Critical Manegro Administração E Participações Ltda.
Priority to AU26523/00A priority Critical patent/AU2652300A/en
Publication of WO2000052238A1 publication Critical patent/WO2000052238A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/42—Formation of filaments, threads, or the like by cutting films into narrow ribbons or filaments or by fibrillation of films or filaments
    • D01D5/426—Formation of filaments, threads, or the like by cutting films into narrow ribbons or filaments or by fibrillation of films or filaments by cutting films
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/08—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polymers of halogenated hydrocarbons
    • D01F6/12—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polymers of halogenated hydrocarbons from polymers of fluorinated hydrocarbons

Definitions

  • This invention refers to a process and installation for the manufacture of fila- ments, particularly filaments of polytetrafluoroethylene (PTFE), which can be used as dental floss, sewing thread, for weaving, for making filters, as fibers for spinning or other applications.
  • PTFE polytetrafluoroethylene
  • PTFE filaments starts with an expanded PTFE strip.
  • this material may be PTFE resin, either pure or combined with other fillers, such as graphite, mica, glass or other organic or inorganic components.
  • the filament may also be impregnated with materials that impart lubricating properties to it.
  • the PTFE strips that serve as a initial material for the filaments are manufactured by the process usually called "slurry-extrusion process". This process involves extruding a preformed billet of PTFE mixed with an appropriate fraction of liquid lubricant that will act as an extrusion aid. The extrudate then passes through the calender rollers, where it will be pressed until the desired thickness, in the form of a strip, is reached. Then the strip is dried to eliminate the extrusion aid and then stretched and sintered.
  • Document GB 1287874, LENZING had previously disclosed a process for the production of fibers, in which a sheet is extracted from a spool by a first triple set of rollers.
  • the sheet may be heated and then divided into a plurality of fibers that are passed through a heated guide that is in contact with the multifilament.
  • a second triple set of rollers located after the heated guide, operates at a higher speed than that of the first set of rollers, causing a stretching of the fibers in the interval between the two sets.
  • the stretching ratio ranges from 1:2 to 1:10, depending upon the material being stretched.
  • the fibers pass through a device for thermosetting by heating, where the fibers are heated at a temperature below the softening temperature and then wound.
  • the Brazilian document PI 9001696, LENZING describes a process for stretching a PTFE-based mass, in which a molded body is heated to a temperature ranging from 327 to 450° C, preferably from 350 to 390° C, sintered and only then stretched
  • the mass molded by this process has resistance values in the longitudinal direction of 500 N/mm 2 (500 MPa), preferably at least 700 N/mm 2 (700 MPa) and a density from 1 80 to 2 30 g/cm 3
  • first stretching step - for instance, with stretching ratio ranging from 5:1 to 20:1 - with simulta ⁇ neous heating to reduce its density to a value between 0.70 and 0.30 g/cm 3 , followed by a step of stabilization of the strip without alteration of the state of the PTFE by passing through an oven at a temperature of, for instance, 150 to 250° C, and for a period of time, for exam- pie, from 5 seconds to 2 minutes, while maintaining the strip under tension, so that its density will increase, followed by a stretching step - for instance, with a stretching ratio of 4: 1 - with simultaneous heating so that the density of the strip can reach a value ranging from 0.20 g/cm 3 to 0J2 g/cm 3 .
  • the sole objective aimed at is a low density, without concern for the thread's tensile strength level.
  • the objective of this invention lies, therefore, in providing a process for the manufacture of a PTFE filament that will result in filaments having a lower title or relative weight, but with high breaking strength.
  • the strip is exposed to a temperature between 280° C and 350°C.
  • these are exposed to a temperature in the range 300° C to 450° C.
  • the specific stretching lies within the range from 50 to 30,000%/m and the stretching rate ranges from 50 to 10,000%/sec.
  • Figure 1 shows, schematically, a PTFE-filament pro- duction line.
  • an initial material is mixed in mixer 1 at a temperature lower than 19° C.
  • the PTFE is mixed with a liquid lubricant, extrusion aid, in a proportion ranging from 17% to 29% of lubricant and 83% to 71 % of PTFE, respectively. This mixture is processed, preferably for 20 to 30 minutes.
  • the material is pressed in a preform machine 2, forming a billet.
  • the billet is then taken to the step of extruding in an extruding machine 3, where the material is forced through an orifice, forming an extruded preform, this process being responsible for arranging the PTFE particles into fibrils.
  • the extruded preform is then passed through calender rollers 4 in order to form a strip with a thickness of from 0.05 mm to 0.65 mm.
  • the strip resulting from the calendering is then sent to a drying oven 5 for removing the liquid lubricant.
  • the drying temperature ranges from 100°C to 250° C.
  • After drying the strip is stretched for the first time, passing through tensioning rollers between the two units of pulling rollers 6 that operate with a stretching ratio - that is, the ratio between the entry speed and the exit speed - from 3 to 5, and a stretching tem ⁇ perature ranging from 240° C to 350° C
  • the stretching rate - that de- fines the relationship between the ratio of the entry speed and the exit speed of the strip, re ⁇ spectively, and the time under temperature for the stretching to take place - ranges from 50 to 10,000%/sec, preferably from 300 to 5,000%/sec
  • the stretching is carried out under heating, by means of a heating element 7 that may be an oven, a hot-air, steam or high- boiling-point liquid heater, a heated plate or a heated cylinder
  • the bobbin of strip is led to unwinder 9, which makes the alignment of the st ⁇ p, which follows to the cutting step in the cutting unit 10
  • the cutting unit 10 contains parallel blades on which the strip is passed, whereby the individual PTFE-filaments are cut and separated
  • the stretched filament between two units of pulling rollers 1 1 that operate with a stretching ratio from 3 to 25
  • the stretching rate ranges from 50 to 10,000 %/sec , preferably from 100 to 3,000 %/sec
  • a heating element is provided, for in- stance, an oven 12, operating at a temperature between 330° C and 440°C, which results in the sintering of the material at this step
  • the heating element may also be a hot-air, steam, high-boiling-point liquid heater, a heated plate or a heated cylinder
  • the stretched and sintered individual filaments are wound in the winding unit 13 into their respective final packages
  • the density of the PTFE filament ranges from
  • the final filament should still have the characteristic of tensile strength such that its specific resistance or toughness ranges from 1.6 to 5 cN/dTex
  • Thread-Stretching Experiments The tables below show three series of results of experiments of thread-stretching, where the values of the first and second stretchings are always expressed in %/second In each series of experiments (A, B), the initial thickness of the strip and the temperature of the oven in the first stretching are constant, the temperature of the oven varying in the second stretching for each set of experiments (A1 , A2, A3, B1 , B2, B3)

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Inorganic Fibers (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

L'invention concerne un procédé et une installation destinés à la fabrication de filaments, notamment de filaments PTFE, à partir d'une bande, de manière à former des filaments de faible titre mais très résistants à la traction. Le procédé selon l'invention consiste : à étirer une bande par application simultanée de chaleur ; à découper la bande de manière à produire des filaments individuels ; et à étirer les filaments par application simultanée de chaleur. Lors de l'opération d'étirage de la bande, la bande est exposée à une température comprise entre 240 °C et 350 °C, lors des étapes d'étirage de la bande et des filaments, les filaments sont exposés à une température comprise entre 330 °C et 420 °C, et lors des opérations d'étirage de la bande et des filaments, le taux d'étirage varie de 50 à 30,000 %/m et de 50 à 10,000 %/sec.
PCT/BR2000/000016 1999-02-26 2000-02-25 Procede de fabrication de filaments, notamment de filaments de ptfe, et installation destinee a la mise en oeuvre ledit procede WO2000052238A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU26523/00A AU2652300A (en) 1999-02-26 2000-02-25 A process for the manufacture of filaments, particularly ptfe filaments, and an installation for carrying it out

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BR9902001A BR9902001A (pt) 1999-02-26 1999-02-26 Processo para a fabricação de filamentos, particularmente filamentos de ptfe, e instalação para sua execução
BRPI9902001-7 1999-02-26

Publications (1)

Publication Number Publication Date
WO2000052238A1 true WO2000052238A1 (fr) 2000-09-08

Family

ID=4072524

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR2000/000016 WO2000052238A1 (fr) 1999-02-26 2000-02-25 Procede de fabrication de filaments, notamment de filaments de ptfe, et installation destinee a la mise en oeuvre ledit procede

Country Status (3)

Country Link
AU (1) AU2652300A (fr)
BR (1) BR9902001A (fr)
WO (1) WO2000052238A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105648556A (zh) * 2014-10-31 2016-06-08 陈路 一种用于制造ptfe缝纫线的拉丝机
CN105887222A (zh) * 2014-10-31 2016-08-24 陈路 一种用于制造ptfe缝纫线的膜牵伸装置
CN105887215A (zh) * 2014-10-31 2016-08-24 陈路 一种挤出法制造ptfe缝纫线的工艺
CN105887264A (zh) * 2014-10-31 2016-08-24 陈路 一种膜裂法制造ptfe缝纫线的工艺
CN105887225A (zh) * 2014-10-31 2016-08-24 陈路 一种用于制造ptfe缝纫线的膜裂牵伸装置
CN105970397A (zh) * 2016-07-19 2016-09-28 苏州耐德新材料科技有限公司 一种聚四氟乙烯单丝的牵伸加热装置
CN106012062A (zh) * 2016-08-02 2016-10-12 苏州耐德新材料科技有限公司 一种聚四氟乙烯连续长丝及其生产方法
CN113062000A (zh) * 2021-03-15 2021-07-02 上海灵氟隆膜技术有限公司 一种聚四氟乙烯牙线制备方法及系统
CN113201812A (zh) * 2021-05-31 2021-08-03 青岛大学 一种ptfe裂膜纤维加捻纱全自动生产线及生产工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110055603B (zh) * 2019-04-24 2020-07-17 浙江绿净环保科技股份有限公司 一种标记ptfe缝纫线的结构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953566A (en) * 1970-05-21 1976-04-27 W. L. Gore & Associates, Inc. Process for producing porous products
WO1994002668A1 (fr) * 1992-07-16 1994-02-03 W.L. Gore & Associates, Inc. Fibre de polytetrafluoroethylene contenant une matiere de charge conductrice
WO1995034699A1 (fr) * 1994-06-15 1995-12-21 W.L. Gore & Associates, Inc. Fibre amelioree en ptfe expanse, procede pour la fabriquer et etoffe realisee avec cette fibre

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953566A (en) * 1970-05-21 1976-04-27 W. L. Gore & Associates, Inc. Process for producing porous products
WO1994002668A1 (fr) * 1992-07-16 1994-02-03 W.L. Gore & Associates, Inc. Fibre de polytetrafluoroethylene contenant une matiere de charge conductrice
WO1995034699A1 (fr) * 1994-06-15 1995-12-21 W.L. Gore & Associates, Inc. Fibre amelioree en ptfe expanse, procede pour la fabriquer et etoffe realisee avec cette fibre

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105648556A (zh) * 2014-10-31 2016-06-08 陈路 一种用于制造ptfe缝纫线的拉丝机
CN105887222A (zh) * 2014-10-31 2016-08-24 陈路 一种用于制造ptfe缝纫线的膜牵伸装置
CN105887215A (zh) * 2014-10-31 2016-08-24 陈路 一种挤出法制造ptfe缝纫线的工艺
CN105887264A (zh) * 2014-10-31 2016-08-24 陈路 一种膜裂法制造ptfe缝纫线的工艺
CN105887225A (zh) * 2014-10-31 2016-08-24 陈路 一种用于制造ptfe缝纫线的膜裂牵伸装置
CN105970397A (zh) * 2016-07-19 2016-09-28 苏州耐德新材料科技有限公司 一种聚四氟乙烯单丝的牵伸加热装置
CN106012062A (zh) * 2016-08-02 2016-10-12 苏州耐德新材料科技有限公司 一种聚四氟乙烯连续长丝及其生产方法
CN113062000A (zh) * 2021-03-15 2021-07-02 上海灵氟隆膜技术有限公司 一种聚四氟乙烯牙线制备方法及系统
CN113201812A (zh) * 2021-05-31 2021-08-03 青岛大学 一种ptfe裂膜纤维加捻纱全自动生产线及生产工艺

Also Published As

Publication number Publication date
AU2652300A (en) 2000-09-21
BR9902001A (pt) 2001-05-22

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