US3917140A - Process for transforming continuous synthetic fibre strip into cut strip and apparatus for carrying out the process - Google Patents

Process for transforming continuous synthetic fibre strip into cut strip and apparatus for carrying out the process Download PDF

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Publication number
US3917140A
US3917140A US351412A US35141273A US3917140A US 3917140 A US3917140 A US 3917140A US 351412 A US351412 A US 351412A US 35141273 A US35141273 A US 35141273A US 3917140 A US3917140 A US 3917140A
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Prior art keywords
strip
helical
cutting
zone
threads
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US351412A
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English (en)
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Carlo Degli Antoni
Francesco Pellegrini
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G1/00—Severing continuous filaments or long fibres, e.g. stapling
    • D01G1/06—Converting tows to slivers or yarns, e.g. in direct spinning
    • D01G1/10—Converting tows to slivers or yarns, e.g. in direct spinning by cutting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T225/00—Severing by tearing or breaking
    • Y10T225/30—Breaking or tearing apparatus
    • Y10T225/307—Combined with preliminary weakener or with nonbreaking cutter
    • Y10T225/321—Preliminary weakener
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T225/00—Severing by tearing or breaking
    • Y10T225/30—Breaking or tearing apparatus
    • Y10T225/35—Work-parting pullers [bursters]

Definitions

  • PROCESS FOR TRANSFORMING CONTINUOUS SYNTHETIC FIBRE STRIP INTO CUT STRIP AND APPARATUS FOR CARRYING OUT THE PROCESS Inventors: Carlo Degli Antoni,
  • the apparatus carrying out this process comprises a helical knife followed by a plurality of rollers.
  • the present invention relates to a process for transforming continuous synthetic fibre strip into cut strip suitable for feeding spinning machines of the wool or cotton type.
  • the invention refers also to the apparatus for carrying out the process.
  • One type of machine is a tearing converter by means of which the continuous synthetic fibre strip (tow) passes through a series of cylinders which progressively stretch the strip until the fibres break in various points.
  • Another type of machine is the cutting converter in which the tow is cut by helical knives formed on a rotating cylinder.
  • Another machine used is a combined cutting and tearing converted in which the tow is incised by two opposing stellar cylinders while the fibres are simultaneously stretched in order to tear them.
  • the product is damaged because of the squeezing of the fibres be tween the cutting cylinder and the anvil; moreover the helical knife has a fairly limited life.
  • the main object of the present invention is to largely obviate the aforementioned disadvantgages relative to transforming machines of known type, by providing a process by means of which the tow-tops transformation can take place with the minimum formation of powder, a reduced squashing of the fibres, and a better distribution and sliding of the fibres, and a better distribution and sliding of the fibres with the consequent obtaining of satisfactory diagrams of fitness for spinning.
  • a further important object of the invention is to provide a process which may be carried out by apparatus .of simple construction, of reliable operation and long lasting, and able to give a much higher production than that obtainable by apparatus of known type.
  • a further important object of the invention is to provide an apparatus which does not require combing de- 2 vices for regularising the strip, as in the case of cutting converters and combined cutting and tearing converters of known type.
  • FIG. 1 is a diagrammatic longitudinal sectional view of the apparatus according to the invention showing the processing line;
  • FIG. 2 is a diagrammatic development of the helical knife forming part of the apparatus shown in FIG. 1, in a triple-thread construction;
  • FIG. 3 is a lateral view of the helical knife in a ninethread construction
  • FIG. 3a is a diagram relative to FIG. 3 illustrating the distribution of the varous thread starts
  • FIG. 4 is a lateral view of the helical knife, in a fourthread construction, with irregular distribution
  • FIG. 4a is a diagram relative to FIG. 4 showing the distribution of the thread starts.
  • the apparatus for carrying out the process according to the invention comprises in a cutting zone of the processing line shown in FIG. 1 a helical knife 1 associated with a counter roller or anvil 2 and situated downstream of a first driving roller 3 associated with respective counter rollers 4 and arranged in a feeding zone for the continuous strip 5.
  • the knife 1 is provided for making a simple incision in the fibres of the continuous strip 5, contrary to that provided in cuttng converters of known type in which the helical knife cuts the fibres.
  • the counter roller or anvil 2 of smooth steel, has a diameter equal to 40% of the diameter of the helical knife 1.
  • Both the helical knife 1 and anvil 2 are connected to drive means and are rotated with a speed such as to cause slight stretching of the fibres (equal to about 1%) in that pprtion of the path between them and the roller 3 thereby providing there a first stretching zone in the processing line.
  • roller 6 Downstream of the helical knife 1, which will be described in greater detail hereinafter, is disposed a roller 6 with a knurled surface for relieving of the knife 1, the roller 6 opposing a further roller 7 also of knurled surface for relieving of the anvil 2.
  • the rollers 6 and 7 are also driving or motive, with a peripheral speed such as to determine between them and the knife 1 a slight stretching equal to about 1-1 .5 times thereby providing there a second stretching zone in the processing line.
  • rollers 8 and 9 are followed by a pair of accompanying rollers 8 and 9, of which roller 8 is idle and roller 9 is driven, downstream of which is providEd a motive roller 10 as- 3 sociated with two counter rollers II, also mo'tive.
  • the roller and counter rollers 11 are rotated at a speed such as to determine between them and the rollers 6-7 the true stretching of'the fibres, by 3 to times. In this zone the fibres are torn at the incisions made by the helical knife 1 thereby providing there a tearing zone in the processing line.
  • an idle roller 12 Downstream of the roller 10 is provided an idle roller 12 with a knurled surface driven by friction by the roller 10, which serves'to accompany the fibre.
  • the helical knife is constituted according to the invention by a roller having a surface of circular cross-section which carries helical cutting projections disposed in two portions or areas with opposite inclinations so as to determine a cusp convergence towards the centre.
  • the helical knife 1 used in the apparatus is provided with cutting threads distributed uniformly in two converging sections or areas, with a three-thread disposition, indicated by continuous lines 15, dashed and dotted lines 16 and dashed lines 17 the cutting threads of each area having the same pitch angle and converge as a cusp towards a center area.
  • a helical knife is provided with cutting projections of nine threads distributed uniformly over two adjacent zones or areas of opposing inclination.
  • the external diameter A of the helical knife shown in FIG. 3 is 144 mm
  • the beginning points of the threads are distributed uniformly at a constant distance equal to a peripheral development a (FIG. 3a) of 50.24 mm.
  • a helical knife 1 is provided with cutting projections of four threads distributed, in a nonuniform manner, again over two zones or areas in which said projections are inclined in opposite directions.
  • the beginning points of the four threads may be identified by developing on the external circumference the portions b, c, d, e (FIG. 4a) equal respectively to 140 mm, 130 mm, 120 mm, and 112.4 mm.
  • the continuous synthetic fibre strip (tow) 5 is guided by the rollers 3 and 4 to the helical knife 1 where is passes between it and the anvil 2.
  • the strip 5 undergoes a continuous incision by the cutting projections of the knife 1.
  • the particular cusp disposition of the cutting threads of the knife 1 gives rise to various advantages with respect to known machines using helical knives with a normal spiral.
  • the strip 5 passesbetween the take-up rollers 6 and 7 which avoid the fibre winding on the rollers 1 and 2.
  • the tape 5 is stretched in the direction of its length by 3 to 15 times so that the fibres are torn at the incisions.
  • the apparatus heretofore described gives a very rational treatment to the fibres and a transformation process which is regular and continuous.
  • the particular configuration of the knife 1 avoids the formation of bunches (accumulations of fibres which have not undergone mutual slipping).
  • the threads of the helical knife 1 may have a progressive pitch angle or inclination so as to reduce the thrust towards the centre, with a consequently smaller displacement of the fibres in the transverse direction.
  • An apparatus for transforming continuous synthetic fiber strip into cut strip suitable for feeding spinning machines of the wool or cotton type comprising a processing line for the strip including a feeding zone, for the strip, a cutting zone therefor, a stretching and tearing zone for the strip and a transfer zone therefor, wherein the cutting zone for the strip has a helical knife for the continuous incision of the fibers, said helical knife consisting of an incisions making roller cooperatingwith anvil means and having a surface of circular cross-section, said surface having a central area and two areas adjacent to said central area, said roller comprising helical cutting projections disposed in said two adjacent areas in which said projections are of opposite inclination and converge as a cusp towards said center area, thereby to provide continuously in the strip fibers differently oriented incisions with a transverse inclination thereof and to provide stretching and tearing actions in the zones subsequent to the cutting zone.
  • helical cutting projections are helical cutting threads of multiple thread type wherein all cutting threads of each of said adjacent areas have the same pitch angle.
  • said helical cutting projections are helical cutting threads of multiple thread type, wherein the helical cutting threads have a progressive pitch angle.
  • said helical cutting projections are helical cutting threads of multiple thread type, and wherein the threads are distributed in a non uniform manner over said adjacent areas.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
US351412A 1972-04-19 1973-04-16 Process for transforming continuous synthetic fibre strip into cut strip and apparatus for carrying out the process Expired - Lifetime US3917140A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT23381/72A IT953701B (it) 1972-04-19 1972-04-19 Procedimento per la trasformazio ne di nastro continuo di fibre sintetiche in nastro tagliato at to alla alimentazione di macchine di filatura di ripo laniero o coto niero e apparecchiatura per l at tuazione del medesimo procedimento

Publications (1)

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US3917140A true US3917140A (en) 1975-11-04

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US351412A Expired - Lifetime US3917140A (en) 1972-04-19 1973-04-16 Process for transforming continuous synthetic fibre strip into cut strip and apparatus for carrying out the process

Country Status (7)

Country Link
US (1) US3917140A (enExample)
BE (1) BE798405A (enExample)
DE (1) DE2319191C3 (enExample)
ES (2) ES414503A1 (enExample)
FR (1) FR2180977B1 (enExample)
GB (1) GB1433174A (enExample)
IT (1) IT953701B (enExample)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2601200A (en) * 1948-11-09 1952-06-17 Dow Chemical Co Production of molding granules
US2956484A (en) * 1956-04-28 1960-10-18 Berkley Machine Co Apparatus for forming patches for application to envelope blanks and similar articles
US3596816A (en) * 1969-05-05 1971-08-03 Phillips Petroleum Co Fibrillation method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR853056A (fr) * 1939-04-13 1940-03-09 Phrix Arbeitsgemeinschaft Procédé et dispositif pour la mise en mèche et l'étirage de bandes ou rubans sans fin de fibres artificielles
CH299993A (fr) * 1951-08-23 1954-07-15 Soc D Const Mecaniques De Stai Procédé pour la transformation directe d'un faisceau de filaments continus en mèche de fibres discontinues, et dispositif pour la mise en oeuvre de ce procédé.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2601200A (en) * 1948-11-09 1952-06-17 Dow Chemical Co Production of molding granules
US2956484A (en) * 1956-04-28 1960-10-18 Berkley Machine Co Apparatus for forming patches for application to envelope blanks and similar articles
US3596816A (en) * 1969-05-05 1971-08-03 Phillips Petroleum Co Fibrillation method

Also Published As

Publication number Publication date
FR2180977B1 (enExample) 1977-02-04
DE2319191B2 (de) 1978-04-13
BE798405A (fr) 1973-08-16
DE2319191C3 (de) 1978-11-30
GB1433174A (en) 1976-04-22
ES414503A1 (es) 1976-02-16
ES430196A1 (es) 1976-10-16
DE2319191A1 (de) 1973-10-25
FR2180977A1 (enExample) 1973-11-30
IT953701B (it) 1973-08-10

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