EP4130360A1 - Dispositif de filage du type à jet d'air ayant un système de démarrage de filature amélioré et procédé de démarrage de filature de type à jet d'air associé - Google Patents

Dispositif de filage du type à jet d'air ayant un système de démarrage de filature amélioré et procédé de démarrage de filature de type à jet d'air associé Download PDF

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Publication number
EP4130360A1
EP4130360A1 EP22179909.1A EP22179909A EP4130360A1 EP 4130360 A1 EP4130360 A1 EP 4130360A1 EP 22179909 A EP22179909 A EP 22179909A EP 4130360 A1 EP4130360 A1 EP 4130360A1
Authority
EP
European Patent Office
Prior art keywords
spinning
air
nozzle
jet type
starter
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.)
Pending
Application number
EP22179909.1A
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German (de)
English (en)
Inventor
Luca DEOTTO
Fabio D'agnolo
Massimo PUIATTI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Savio Macchine Tessili SpA
Original Assignee
Savio Macchine Tessili SpA
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 Savio Macchine Tessili SpA filed Critical Savio Macchine Tessili SpA
Publication of EP4130360A1 publication Critical patent/EP4130360A1/fr
Pending legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
    • D01H1/11—Spinning by false-twisting
    • D01H1/115—Spinning by false-twisting using pneumatic means

Definitions

  • the present invention relates to an air-jet type spinning device having an improved spinning starting system and related air-jet type spinning starting method.
  • the fibres constituting the incoming web are introduced into the spinning chamber.
  • the peripheral fibres of the web tend to open, to then rewind around the inner fibres with the desired twist.
  • a pneumatic ejector which, supplied with compressed air by means of a solenoid valve, produces a Venturi vacuum effect.
  • This device has the dual purpose of conveying the fibres inside the spindle, without dispersing them in the spinning chamber, and of imparting, with a whirling and rotating flow, a minimal binding on the fibres with a twist opposite to the spinning twist, giving them the continuity needed to be pinched by the extraction axis and conveyed to the accumulation system and to the reel.
  • the spinning twist is Z-type, so the twist that the Venturi ejector tends to impart to the fibre is S-type.
  • Figure 1 shows the heart of the spinning system, i.e. the fibre introducer, the spinning chamber and the Venturi-type system that allows spinning to start.
  • the cycle initially foresees the intervention of the Venturi ejector and the subsequent feeding of the fibres into the spinning chamber by the drawing unit. Air is then injected into the spinning chamber thereby generating a yarn with the desired twist (typically Z) but with characteristics that do not yet comply with those desired and not yet in a stable and continuous manner over time.
  • desired twist typically Z
  • Figure 2 shows the typical trend of the Venturi ejector supply pressure, which undergoes a "step” following its shutdown.
  • the pneumatic feed of the spinning chamber and the Venturi generate useful conflicting effects for yarn production.
  • the Venturi in fact, normally creates a flow of air opposite to that produced by the spinning chamber and therefore tends to oppose the formation of the yarn (if, for example, the spinning machine has to produce Z yarn, the Venturi generates a flow of air that favours the formation of S yarn).
  • a condition of ideally quasi-static equilibrium must be established between the flow in the spinning chamber, which tends to wind the fibres onto themselves, and the Venturi flow, which is responsible for retaining the fibres and conveying them into the spindle.
  • One possible solution is to reduce the supply pressure of the Venturi ejector; however, in the initial starting phase the fibres must be subjected to a technological depression equal to at least 150 mbar, a value typically made possible only with pneumatic pressures higher than 3 bar, which prevents this solution from being viable or advantageous.
  • reference numeral 4 globally denotes an air-jet type spinning device.
  • the air-jet type spinning device 4 is provided with a spinning starter system comprising a drawing unit 8 configured to draw a fibre web 12 to be fed to a spinning chamber 16 through a fibre introducer 20.
  • Said fibre introducer 20 in turn faces a spindle 24, having a cavity 28, shaped so as to receive in input the fibres partially wound in the spinning chamber 16.
  • the spinning chamber 16, the fibre introducer 20, the spindle 24 and the cavity 28 preferably extend along a prevailing extension axis X-X.
  • the spinning chamber 16 is shaped so as to obtain in output a yarn 18 comprising a plurality of wound fibres, which is in turn fed to a winding unit (not illustrated) of the yarn produced, at the outlet of said spinning chamber 16.
  • the spinning chamber 16 is fluidically connected to a starter nozzle or Venturi nozzle 36, configured to trigger the start-up of spinning, and to a main nozzle 40, configured to send a jet of compressed air into the spinning chamber 16.
  • the starter nozzle 36 is fluidically connected to a pneumatic spinning starter system 38 and the main nozzle 40 is fluidically connected to a main pneumatic system 42.
  • the spinning device 4 further comprises a processing and control unit operatively connected to said pneumatic spinning starter system 38, said main pneumatic system 42 and said drawing unit 8.
  • processing and control unit is programmed so that during spinning start-up:
  • this reduction in starting pressure from the initial maximum value p_max to zero pressure follows an average pressure gradient in absolute value of less than 6 bar/s.
  • the average reduction in the time unit of the supply pressure of the starter nozzle 36 presents a maximum value, in absolute value, of 6 bar/s.
  • said reduction in the supply pressure of the starter nozzle 36 follows a plurality of stepped pressure reductions.
  • said reduction in the supply pressure of the starter nozzle 36 follows a linear decreasing trend.
  • said reduction in the supply pressure of the starter nozzle 36 follows a decreasing polynomial trend of at least two degrees.
  • the pneumatic spinning starter system 38 is controlled by at least two separate pneumatic solenoid valves 48,52 placed in parallel with each other and connected to at least two separate pressure lines.
  • said solenoid valves 48, 52 are operated independently and selectively. In this way, in fact, it is possible to divide the overall pressure drop into two or more intermediate drops, corresponding to the same number of solenoid valves placed in parallel, customizing the supply pressure and the on/off time and thus making the pressure decrease profile more gradual over time.
  • the pneumatic spinning starter system 38 is connected to a pressure regulator 54, placed in series via a connector tube 56 to a flow regulator 58, controlled by a single solenoid valve 62 and fitted with a calibrated one-way orifice 60 towards the flow regulator.
  • This pneumatic configuration is particularly advantageous because it allows a continuous and regular shutdown of the starter nozzle without steps thanks to the presence of the calibrated orifice, which dampens and delays the closing of the pressure regulator.
  • the pressure decrease time of the starter nozzle from the initial maximum value (p_max) to the zero value can be advantageously set by choosing a suitable combination of length and diameter of the connection tube 56 and diameter of the calibrated orifice 60.
  • the inner diameter of said connection tube 56 is between 2 mm and 2.5 mm.
  • the length of said connection tube 56 is between 500 mm and 1000 mm, preferably 700 mm.
  • the diameter of said calibrated orifice 60 is between 0.15 mm and 0.35 mm, preferably 0.20 mm.
  • the processing and control unit is programmed such that the difference between the instant t_2 and the instant t_1 is between 0 ms and 500 ms, preferably 250 ms.
  • the solution according to the invention provides that the Venturi ejector or starter nozzle 36 for starting the spinning is deactivated in a gradual manner, slowly reducing the pressure and thus the air speed so as to ensure a continuity of equilibrium between the air pressure in the spinning chamber 16, obtained by means of the main nozzle 40, and the depression created by the Venturi nozzle or starter nozzle 36.
  • the objective is in fact to guarantee the necessary time interval to allow the transient adaptation effect between the pressure of the spinning chamber 16 and the pressure of the Venturi nozzle 36 to develop completely, avoiding any form of discontinuity in the evolution of the outflow, which would consequently trigger undesired phenomena of bad or failed starting of the spinning process.
  • the transition from the maximum starting pressure p_max to zero pressure does not occur suddenly with a single step, but with a plurality of steps or more generally according to a continuous decreasing profile.
  • the innovative starting cycle consists of the following phases:
  • the present invention makes it possible to overcome the drawbacks of the prior art.
  • One of the main advantages of the present invention is the improvement and regularization of the starting of the air-jet spinning process, which is particularly useful for yarns made of stiff fibres and in case of reduced fibre transit times in the spinning chamber.
  • the increase in starting efficiency contributes to increasing the efficiency of the spinning device and thus the productivity of the machine, to significantly reducing unwanted windings of yarn at the start of spinning, to improving the cleanliness of the device and to reducing the percentage of waste fibre to be disposed of.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
EP22179909.1A 2021-08-02 2022-06-20 Dispositif de filage du type à jet d'air ayant un système de démarrage de filature amélioré et procédé de démarrage de filature de type à jet d'air associé Pending EP4130360A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102021000020786A IT202100020786A1 (it) 2021-08-02 2021-08-02 Unità di filatura di tipo air-jet con sistema di avviamento della filatura perfezionato e relativo metodo di avviamento della filatura di tipo air-jet

Publications (1)

Publication Number Publication Date
EP4130360A1 true EP4130360A1 (fr) 2023-02-08

Family

ID=78086836

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22179909.1A Pending EP4130360A1 (fr) 2021-08-02 2022-06-20 Dispositif de filage du type à jet d'air ayant un système de démarrage de filature amélioré et procédé de démarrage de filature de type à jet d'air associé

Country Status (3)

Country Link
EP (1) EP4130360A1 (fr)
CN (1) CN115701457A (fr)
IT (1) IT202100020786A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05125624A (ja) * 1991-10-30 1993-05-21 Toray Eng Co Ltd 結束紡績機、および、結束紡績機用糸形成装置
US20020026781A1 (en) * 2000-09-01 2002-03-07 Murata Kikai Kabushiki Kaisha, Kyoto-Shi, Japan Core yarn manufacturing machine and core yarn manufacturing method
US20030101710A1 (en) * 2001-08-29 2003-06-05 Maschinenefabrik Rieter Ag Measure for influencing the axial flow in the spindle channel of an air-vortex spinning apparatus
US20140237985A1 (en) * 2013-02-28 2014-08-28 Maschinenfabrik Rieter Ag Spinning Unit for the Production of a Yarn

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05125624A (ja) * 1991-10-30 1993-05-21 Toray Eng Co Ltd 結束紡績機、および、結束紡績機用糸形成装置
US20020026781A1 (en) * 2000-09-01 2002-03-07 Murata Kikai Kabushiki Kaisha, Kyoto-Shi, Japan Core yarn manufacturing machine and core yarn manufacturing method
US20030101710A1 (en) * 2001-08-29 2003-06-05 Maschinenefabrik Rieter Ag Measure for influencing the axial flow in the spindle channel of an air-vortex spinning apparatus
US20140237985A1 (en) * 2013-02-28 2014-08-28 Maschinenfabrik Rieter Ag Spinning Unit for the Production of a Yarn

Also Published As

Publication number Publication date
CN115701457A (zh) 2023-02-10
IT202100020786A1 (it) 2023-02-02

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