Classifications

• • 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
  • D01D11/00—Other features of manufacture
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
  • B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
  • B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
  • B65H63/028—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element
  • B65H63/032—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic
  • B65H63/0321—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators
  • B65H63/0324—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators using photo-electric sensing means, i.e. the defect signal is a variation of light energy
• • 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
  • D01D13/00—Complete machines for producing artificial threads
  • D01D13/02—Elements of machines in combination
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2701/00—Handled material; Storage means
  • B65H2701/30—Handled filamentary material
  • B65H2701/31—Textiles threads or artificial strands of filaments
  • B65H2701/313—Synthetic polymer threads
  • B65H2701/3132—Synthetic polymer threads extruded from spinnerets

Definitions

• This invention concerns in general the spinning processes for the production of synthetic fibres, and refers in particular to a method for detecting the breakage of one or more filaments during a synthetic fibre spinning process.
• the synthetic fibres are filamentary materials industrially produced starting from a synthetic polymer, that can be of a different nature, and by a spinning process that consists basically in the heating up to the fusion of the starting polymer, in thrusting under pressure the molten polymer through a spinneret for the formation of a plurality of filaments and in joining and coagulating the filaments by cooling them with air or by humidity.
• the process is carried out in plants having several spinning stations, so-called cabs, each comprising, from the top to the bottom, the so-called extrusion "packs", an intermediate cooling part, and lower nozzles for the formation of the required filaments.
• Every pack comprises a cylinder with the function of filtering and making the fused polymer homogenous, and a disk or spinneret provided with small extrusion holes.
• the fused polymer is loaded on a level with the head "packs” and pressed under pressure through the holes in each spinneret, from which exits a number of filaments equal to the number of extrusion holes. These filaments move down the intermediate cooling part of the cabin where they are cooled.
• the cooling of the filaments is carried out by means of a flow of air basically directed towards them in a transverse direction to their path. Then the filaments coming from each pack are grouped together in a corresponding nozzle positioned in the lower part of the cabin in order to form the final thread.
• the yarn In its path through the nozzle, the yarn becomes oiled after which it is collected on bobbins on other machinery provided downstream of the spinning cabins.
• the spinning process above is however affected by a problem deriving from a possible breakage of one or more filaments during the extrusion and/or cooling steps.
• a present method for verifying possible breakage of filaments and by this the resulting quality of the product consists of a periodic at sight inspection on the part of an operator.
• the operator realizes that there is a problem, he has the possibility of interrupting the production and/or of signaling the position of the bobbin that collects a thread of coarse-quality in that one or more filaments are missing.
• the operator can note the breakage of the filament by means of the accumulation of this at a distance from the regular path of the other filaments, but he cannot be able to quantify precisely the number of thread produced and considered as being of minor quality if he is not present at the moment of the breakage.
• the present invention was conceived to effectively resolve such a problem and has as an objective to allow an immediate chick of the breakage of one or more filaments during the spinning processes.
• This object is achieved, according to the invention, by a method consisting in continuative optical monitoring of the direction of a plurality of filaments during their regular moving between the extrusion. spinneret and the grouping nozzle of the filaments for the formation of the thread, and at the right moment detecting an anomalous deviation of the regular path, even of a single thread, significative of a breakage of said filament and in signaling the present process anomaly so as to be able to remedy.
• This method is carried out by an electronic sensor in order to acquire images of the filaments in movement at least in a section of their regular cooling path between the spinneret and the grouping nozzle, said device being programmed to distinguish the irregular direction of at least a filament compared to the regular path of the other filaments and to emit indicative signals of an irregular direction of at least a filament.
• Fig. 1 is a scheme of an extrusion "pack" with a monitoring device when the filaments are integral;
• Fig. 2 is the scheme in Fig. 1 , but in the breakage condition of a filament.
• the reference number 11 indicates an extrusion "pack” in the ambit of a cabin 12 of a spinning plant.
• Said "pack” basically comprises a spinneret 13 from which exits a bundle of filaments 14 converging downwards towards a nozzle 15, which designed to receive and grouped to form a thread 16 which will then be wound onto spools in an apparatus, not shown, downstream.
• the filaments 14 are basically tight, follow an almost stable direction F and they are cooled by a flow of air 17 passing through a cooling radiator 18.
• an optical sensor 19 is positioned to detect the integrity or not of the filaments depending on their regular or irregular trend compared to the movement direction F.
• Said optical sensor 19 can be made, for example, out of a digital video camera or the like able to acquire and enlarge images of the filaments in motion.
• the optical sensor or video camera 19 is positioned on one side of the bundle of filaments 14 opposite the one the flow of cooling air comes from compared with the radiator 18, facing substantially in the transversal direction to the direction F of the movements of the filaments. Furthermore the optical sensor or video camera is programmed to also detect the presence of one of the filaments that actually deviates and moves away from their correct movement direction F towards the nozzle 15.
• the dotted lines in" both the figures of the drawings indicate the shot 20 of the optical sensor or video camera 19 that invest the bundle of filaments 14 in a part of their path and which includes an area which is provided with an alarm 21.
• This alarmed area will be as adjacent as possible to the bundle of filaments and positioned so that when it is crossed by at least a filament that deviates from the regular path of the remaining filaments emits an alarm signal, both luminous and/or acoustic, convertible into another suitable signal so as to activate other electric or mechanical control devices.
• the optical sensor that is the video camera 19, or the like, acquires in continuation the enlarged image of the filaments exiting from the extrusion spinneret, filaments that follow all the F directions, almost stable as regards to convergence, towards the grouping nozzle.
• the optical sensor or video camera simply detect the images, meaning that the spinning process is being carried out normally -Fig. 1.
• any filament 14' break it no longer remains taught and the flow of cold air 7 moves it away from the other integral filaments-Fig. 2. Consequently, given that the flow of cold air 17 is directed towards the video camera 19, the filament 14' is diverted towards the latter and as soon as the image in the ambient of the alarmed area 21 is detected the system activates an indicative signal regarding the anomaly.
• This signal may also be converted into another signal provided, for example, so as to determine where and when the breakage of the filament happened, so as to interrupt the production locally, and define the production of a second quality thread based on the time which has passed since the signal of the breakage and the stop of the spinning process.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Quality & Reliability (AREA)
• Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
• Spinning Or Twisting Of Yarns (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Cites Families (6)

• 2010
  • 2010-04-01 IT ITBS2010A000065A patent/IT1399114B1/it active
• 2011
  • 2011-03-23 WO PCT/IT2011/000089 patent/WO2011121626A1/en not_active Ceased
  • 2011-03-23 EP EP11721383A patent/EP2553152A1/de not_active Withdrawn

Non-Patent Citations (1)

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