EP0043710A1 - Procédé de raccordement de câbles de filaments - Google Patents

Procédé de raccordement de câbles de filaments Download PDF

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Publication number
EP0043710A1
EP0043710A1 EP81303034A EP81303034A EP0043710A1 EP 0043710 A1 EP0043710 A1 EP 0043710A1 EP 81303034 A EP81303034 A EP 81303034A EP 81303034 A EP81303034 A EP 81303034A EP 0043710 A1 EP0043710 A1 EP 0043710A1
Authority
EP
European Patent Office
Prior art keywords
tow
tows
filaments
adhesive
stretch
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.)
Withdrawn
Application number
EP81303034A
Other languages
German (de)
English (en)
Inventor
Charles Homer Mcgill
Arthur Talley, Jr.
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.)
Monsanto Co
Original Assignee
Monsanto Co
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 Monsanto Co filed Critical Monsanto Co
Publication of EP0043710A1 publication Critical patent/EP0043710A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H69/00—Methods of, or devices for, interconnecting successive lengths of material; Knot-tying devices ;Control of the correct working of the interconnecting device
    • B65H69/02—Methods of, or devices for, interconnecting successive lengths of material; Knot-tying devices ;Control of the correct working of the interconnecting device by means of adhesives
    • 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
    • B65H2701/311—Slivers
    • 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

Definitions

  • This invention relates to methods for . splicing tows of filaments to be stretched.
  • tows of synthetic filaments are not of infinite length but have a length which is determined by practical considerations such as tow size and the size of the carton in which the tow is packaged.
  • Various machines are used to perform different operations on tow and, when one carton of tow is emptied, the next tow must usually be manually laced up through the machine by an operator. Normall . y, the operator merely ties the trailing end of one tow to the leading end of another, using a large knot which must be cut out when it reaches the machine processing the tow. This brings the next tow up to the machine, but it must still be manually laced up through the machine. This takes time and the use of the knot wastes product.
  • the filaments in acrylic tows can be fused together by the application of heat, moisture and pressure or by use of ultra-sonic energy. This forms a hard, fused lump which secures the tows together.
  • This type of splice breaks at the edge of the splice when the tows are passed through the stretch zone of a stretch/break machine. It is speculated that the tow breaks at this point because the filaments have been weakened at this point by the heat applied to form the bond.
  • Air-jets have been used to splice tows to form a strong bond between the tows by tangling the filaments. This type of splice will not withstand the forces which are necessary to stretch and break the filaments in a tow. The splice simply falls apart in the stretch zone and the two tows separate.
  • a method for splicing the ends of a pair of tows of filaments to be fed in succession through a zone where tension is applied to stretch the filaments wherein a work-absorbing adhesive is applied to a portion of the filaments in the end of one of the tows and the adhesive- bearing tow is positioned in contact with the other tow in an overlapping relationship to form an adhesive bond between the tows, the adhesive extending along the overlapped portion of the tows a distance, in centimeters of at least about 25 times the stretch to be applied to the tows.
  • the adhesive has work-absorbing characteristics such that the bond elongates sufficiently to prevent breakage of the bond and the adhered portions of the filaments under sufficient tension to apply a 1.6X stretch to acrylic filaments having a denier per filament (dpf) of 3 and a breaking strength of about 2.5 grams per denier.
  • Figure 1 a schematic side view of a machine used commercially for stretch/breaking tows of acrylic and other filaments.
  • the machine includes driven rolls 11 which are tightly nipped with idle rolls 12 to prevent slippage of a tow 13 made up of continuous filaments as the tow passes between the rolls 11 and 12.
  • Each of the rolls 11 along the path of the tow 13 is driven at a higher peripheral speed than the preceding rolls in order to stretch and eventually break the tow of filaments into staple fibers.
  • Reference number 16 denotes a first zone where sufficient tension is applied to the tow to stretch the continuous filaments in the tow to almost the breaking point.
  • Zones 17-20 are break zones, where additional tension is applied to the tow to break the filaments to form staple fibers, the tow exiting from last roll 11 with the appearance of a bundle of continuous filaments but with all of the filaments being in the form of staple fibers.
  • the tow 13 is fed into the machine over guides 21 and exits from the machine through a crimper 22 to be collected in a container 23. This machine is well known.
  • the present invention discloses a method for splicing the trailing end 13a of one tow 13 to the forward end of 13b of another tow 13 with a splice such that the trailing tow will be pulled through the machine to at least the first break zone, 17, without the tows separating. At this point, or in a subsequent break zone, the operator cuts out and discards the portions of the tows bearing adhesive and laces the new tow through the remainder of the machine. Manual lace-up through the long stretch zone is avoided.
  • an adhesive is applied to one face of one of the tows 13 along a length, L, of the tow.
  • the length, L should be, in centimeters, at least about 25 times the amount the tows are to be stretched in the zone 16.
  • the length L should be at least about 30 centimeters.
  • the term "stretch” means the ratio of the length of the stretched tow leaving the zone 16 to the length of the unstretched tow entering the zone 16.
  • 1.2X means that the tow is stretched to a length 1.2 times its original length.
  • the Tength L is, in centimeters, at least about 35 times the stretch to be applied to.the tows. It is also preferred that the adhesive be applied to both tows before they are brought into contact with each other.
  • the tows are then placed in overlapping relationship as shown in Figure 3 to bond portions of the filaments in each of the tows to portions of the filaments in the other tow. Because of the very large number of filaments in each of the tows 13, it is virtually impossible to bond all of the filaments in one tow to all of the filaments in the other tow. This process is successful where only a small fraction of the filaments in the tows are bonded together.
  • the adhesive applied to the tow has work-absorbing characteristics such that the adhesive will elongate under tension and allow one tow to slip past the other to thereby relieve tension in the tows and insure that those portions of the tows which are secured together by adhesive will not break and allow the two tows to separate. It is believed that the adhesive will absorb work not only by stretching of the adhesive under tension but also by allowing the filaments to slip through the adhesive.
  • the term "elongation" as used herein is intended to include both stretching of the adhesive arid the slipping of the filaments through the adhesive as the tows are stretched.
  • Suitable adhesives include those which are applied as an aerosol, cures at room temperature to a non-tacky state in a few minutes, remains relatively soft even after complete curing and will elongate to allow the desired slippage of one tow relative to the other.
  • Adhesives of this type elongate under tension, are known to those skilled in the art, and are normally used in applications such as securing heavy wall coverings to walls an.d securing upholstery fabric to foam pads.
  • Adhesives which cure to a hard state such as the well known epoxy cements, are not suitable for use in this method for the reason that such adhesives do not have work-absorbing characteristics of the type necessary for s plic- ing two tows as contemplated herein. Also, adhesives which cure to a hard state tend to damage the rubber covering of rolls used in stretch-break machines.
  • the suitability of an adhesive for use in the method of this invention may be determined by using the adhesive to splice two acrylic tows is described herein.
  • the tows should be made up of acrylic filaments having a denier per filament of 3.
  • a 4.5 meter length of the tows, including the splice, is then subjected to a tensile load sufficient to apply a 1.6X stretch to an unspliced tow of 3 dpf acrylic filaments.
  • Such filaments will require a tensile load of about 2 grams per denier for this stretching.
  • Any adhesive which is suitable will allow the tows to slip along each other in the splice and will not break and thereby allow the tows to separate.
  • the adhesive should cure, at room temperature and within a period of 15-20 minutes, to the point where it will not adhere to rubber rolls. Also, after the adhesive has stood several hours and is essentially completely cured, it should be softer than the rubber covers on the rolls of the stretch/break machine.
  • the filaments are stretched almost to the breaking point in the zone 16 and some of them may actually break in this zone. Any breaking of the bonded filaments in the stretch zone is prevented by use of the adhesive specified herein, for the reason that elongation of the adhesive reduces tension on those bonded filaments. As the tows are observed in passing through the stretch zone, one can see one tow slipping relative to the other.

Landscapes

  • Treatment Of Fiber Materials (AREA)
EP81303034A 1980-07-07 1981-07-03 Procédé de raccordement de câbles de filaments Withdrawn EP0043710A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16621780A 1980-07-07 1980-07-07
US166217 1993-12-13

Publications (1)

Publication Number Publication Date
EP0043710A1 true EP0043710A1 (fr) 1982-01-13

Family

ID=22602316

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81303034A Withdrawn EP0043710A1 (fr) 1980-07-07 1981-07-03 Procédé de raccordement de câbles de filaments

Country Status (1)

Country Link
EP (1) EP0043710A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4600457A (en) * 1983-07-05 1986-07-15 Hitco Method and resin solution for splicing carbonized polyacrylonitrile material
EP1990303A1 (fr) * 2007-05-08 2008-11-12 SGL Kümpers GmbH & Co. KG Procédé et dispositif destinés à la liaison de divers matériaux de roving

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367813A (en) * 1965-02-02 1968-02-06 Du Pont Process for splicing ends of yarns
GB1250629A (fr) * 1968-11-07 1971-10-20
GB1350074A (en) * 1970-08-07 1974-04-18 Courtraulds Ltd Method of joining yarn ends

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367813A (en) * 1965-02-02 1968-02-06 Du Pont Process for splicing ends of yarns
GB1250629A (fr) * 1968-11-07 1971-10-20
GB1350074A (en) * 1970-08-07 1974-04-18 Courtraulds Ltd Method of joining yarn ends

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4600457A (en) * 1983-07-05 1986-07-15 Hitco Method and resin solution for splicing carbonized polyacrylonitrile material
EP1990303A1 (fr) * 2007-05-08 2008-11-12 SGL Kümpers GmbH & Co. KG Procédé et dispositif destinés à la liaison de divers matériaux de roving
WO2008135280A1 (fr) * 2007-05-08 2008-11-13 Sgl Kümpers Gmbh & Co. Kg Procédé et dispositif de liaison de différents matériaux de stratifil

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LU NL SE

17P Request for examination filed

Effective date: 19820308

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19830427

RIN1 Information on inventor provided before grant (corrected)

Inventor name: TALLEY, ARTHUR, JR.

Inventor name: MCGILL, CHARLES HOMER