US3402446A

US3402446A - Apparatus for bulking yarn

Info

Publication number: US3402446A
Application number: US570005A
Authority: US
Inventors: Gustav E Benson
Original assignee: Owens Corning Fiberglas Corp
Current assignee: Owens Corning
Priority date: 1966-08-03
Filing date: 1966-08-03
Publication date: 1968-09-24
Anticipated expiration: 1985-09-24
Also published as: DE1785291A1; FR1581208A; BE719367A

Description

p 1968 G. E. BENSON 3,402,446

APPARATUS FOR BULKING YARN Filed :5, 1966 i F Ki 4/2 Eligi- IN VENTOR. G05 7741/ .15. BEA/$0M ATTORNEYS United States Patent 3,402,446 APPARATUS FOR BULKING YARN Gustav E. Benson, Greenville, R.I., assignor to Owens-Corning Fiherglas Corporation, a corporation of Delaware Filed Aug. 3, 1966, Ser. No. 570,005 9 Claims. (Cl. 28-1) ABSTRACT OF THE DISCLOSURE Apparatus for fluid treatment of yarn that includes a body with a chamber and a nipple extending therethrough to a chamber outlet. The nipple has a passageway running therethrough from end to end with a larger entrance at the outer end than the exit at the inner end terminating in the outlet.

Bulking, lofting and texturing multifilament yarns is accomplished in the textile industry using an air jet. The jet provides a fluid texturing zone within which the yarn filaments are disturbed and entangled, Air under pressure is introduced into an internal chamber within the jet and yarn is fed to the jet through the cylindrical entrance passageway of a guide needle or tube extending into the internal chamber and ending in or adjacent to a common yarn and air outlet. Air flow from the internal chamber through the common outlet forms a zone in which the air impinges the yarn as the yarn leaves the jet through the outlet and disturbs the yarns discrete filaments. A bulked or textured yarn is produced.

Prior air jets used to produce multifilament textured yarn experience air blow back through the cylindrical entrance passageway of the guide needle employed to feed the yarn into the texturing zone of the jet.

When these prior jets are operating, air under pressure supplied to the jet not only textures the yarn as both the yarn and air speed through the texturing zone of the common outlet but air also rushes outwardly through the cylindrical entrance passageway at high velocity to the atmosphere.

The input yarn traveling down the passageway along its path to the texturing zone is subjected to abuse of the high velocity of the air escaping in the opposite direction within the confining passageway. The abuse is especially harmful to continuous filament glass yarn. Yarn filaments which have been broken during prior processing, an occurrence particularly common with continuous filament glass yarn, expose ends which ofi'er a surface against which the high velocity blow back air may impinge. The air impinging the surface filaments of the yarn, especially broken filaments, initiates stripping of some filaments backwardly along the length of the yarn proceeding through the passageway. These stripped filaments promote more broken filaments and finally the stripping back process provides a plurality of entangled filaments formed as a fuzz ring surrounding the input yarn fed into the jets entrance passageway.

The friction force occasioned by the yarn touching the fuzz ring at high speed as the yarn proceeds along its path into the jet through the entrance passageway combines with the oppositely directed force of the blow back air escaping from the entrance passageway to dance the fuzz ring back and forth along the yarn outside the jet adjacent to the opening of the entrance passageway. Of course, the movement of the fuzz ring exerts extra and unusual stresses on the input yarn. When the stresses challenge the input yarn beyond its tensile strength, the yarn breaks.

Recent developments in yarn bulking and texturing processes have increased yarn processing speeds significantly Increased yarn speeds and accompanying increases in air pressure Within the jet have augmented the magnitude of forces establishing fuzz rings as described hereinabove to the point where yarn breakage is a serious problem in establishing an effective and economical process producing bulked or textured continuous filament yarn, especially continuous filament glass yarn.

Further, the confining cylindrical entrance passageway of prior the jets abrades the filaments of input yarn as it speeds therethrough to the texturing zone of the jet. This abrading, particularly in the case of continuous filament glass yarn, promotes breakage of surface filaments in the entrance passageway, thereby adding a greater number of filament ends exposed to the high velocity of blow back air. Thus, the spoiling influence of the fuzz ring on input yarn is increased by the additional filament ends released through abrasion in the entrance passageway.

An object of the present invention is to provide a substantially breakout free fluid jet which bulks continuous filament yarn, especially athigh linear yarn speeds.

Another object is to provide an air jet. which bulks yarn at high linear speeds without stripping away yarn filaments causing fuzz rings on the input yarn.

Another object is to provide a fluid jet which dissipates so much of the energy of any blow back air escaping through the jets entrance passageway as to render it harmless to incoming yarn.

Still another object is to provide an air jet which bulks yarn without excessively abrading the yarn passing through its entrance passageway.

These and other objects are attained by using a fluid texturing jet having an entrance guide nipple with a truncated or tapered passageway extending longitudinally therethrough from a larger cross sectional area to a smaller passageway cross sectional area at the nipples termination within the jet. The velocity of any blow back air escaping into the truncated passageway is rapidly decreased in velocity and its pressure is swiftly increased towards atmospheric. Thus, the truncated passageway, in a sense, provides a diffusing zone for escaping air. The high energy of the air is dissipated within the passageway to drastically reduce the heretofore experienced harsh effects on input yarn, especially continuous filament glass yarn. Moreover, the truncated passageway does not interfere to abrade input yarn. In fact, input yarn does not generally touch the surface of the truncated passageway until the smaller cross sectional areas of the passageway are reached just prior to the yarns exit from the passageway.

Other objects and advantages of the invention will become apparent as the invention is hereinafter described in more detail with reference made to the accompanying drawings in which:

FIGURE 1 is a front elevation view of a bulking or texturing jet embodying the principles of the invention.

FIGURE 2 is a longitudinal cross sectional elevation view of the bulking or texturing jet shown in FIGURE 1 and illustrates a yarn entrance guide nipple having a truncated passageway extending therethrough which is moderately tapered.

FIGURE 3 is a rear elevational view of the texturing jet shown in FIGURE 1.

FIGURE 4 is a longitudinal cross sectional view of a bulking or texturing jet embodying the principles of the invention which employs a more highly tapered truncated passageway.

FIGURE 5 is a longitudinal cross sectional view of another form of a bulking or texturing jet. embodying the principles of the invention employing a. highly tapered truncated passageway.

FIGURE 6 is a longitudinal cross sectional elevation view of the jet illustrated in FIGURE where a yarn entrance guide nipple having a two section passageway of different taper is employed.

Details of an embodiment of the invention are shown in FIGURES 1 through 3 where a jet 10 comprises essentially four components: a housing 12, a cap 15, a nozzle 20 and a yarn guiding nipple 30.

The housing 12 is cylindrieally shaped with a bore 14 extending therethrough from end to end. Opening through the arcuate wall of the housing 12 intermediate its ends is an aperture 13 communicating with the bore 14 and into which an air supply line 42 is secured. The forward end of the housing 12 is conformed to receive the cap 15. The rearward end of the housing 12 is conformed to receive the yarn guiding nipple 30.

The cap 15 is a circular plate adapted to fit over the forward 'end of the housing 12, the cap 15 having a passageway 19. While the passageway 19 may be concentric with respect to the cap 15, the passageway 19 is illustrated in FIGURES l-4 as being laterally, i.e. radially, offset from the center of the cap. When in position across the forward end, the cap 15 obstructs the bore 14 and is held tightly against the housing 12 by

screws

16, 17 and 18. With the cap 15 positioned across the forward end of housing 12 the passageway 19 is laterally offset from the longitudinal axis of the housing 12.

Press fitted into the passageway 19 is the cylindrical nozzle 20 having a longitudinal passageway 22 extending therethrough from end to end. When in place within the passageway 19, the nozzle 20 extends normally away from the flat surface of the cap 15. The passageway 22 is a venturi comprising converging section 24, throat 25 and diverging section 26 and communicates with the bore 14.

The yarn guiding nipple 30 is a cone shaped constituent part which seats into the rearward end of the housing 12 and protrudes in decreasing cross sectional area forward into the bore 14. As illustrated the longitudinal axis of the nipple 30 extends along the longitudinal axis of the housing 12. Because the passageway 19 is laterally offset in the cap 15, the nipple 30 is laterally offset with respect to the outlet passageway 22. The nipple 30 is tightly held in position at its base against the housing 12 by

screws

33, 34 and 35. Although the forward smaller end of the nipple 30 is illustrated as terminating in the passageway 22 short of the throat 25, it may terminate anywhere within the throat 22 or short of the passageway 22 in the bore 14.

Extending through the nipple 30 from end to end is a passageway 32 which is tapered to for a truncated cone or funnel shaped passageway having a larger cross sectional area at the bigger base end of the nipple 30 and a smaller cross sectional area at the forward end 31 of the yarn guiding nipple 30.

When the cap 15 and the yarn guiding nipple 30 are in position, the bore 14 is obstructed at its ends, thereby forming an internal chamber 40. Because of the decreasing cross sectional area of the nipple 30 extending forward in the jet 10, the internal chamber extends in increasing cross sectional area to its termination at the forward end.

In operation, air under pressure is supplied to the chamber 40 through the supply line 42. The air exits the chamber 40 to the atmosphere through the nozzle passageway 22 and through the truncated passageway 32 as blow back air.

When the jet 10 is operating as viewed in FIGURE 2, the yarn passes through jet 10 from right to left. The yarn speeds down the passage 32 and exits therefrom into the nozzle passageway 22. The passageway 22, having high energy air flow therethrough, serves as a texturing zone. The filaments of the yarn emerging from the passageway 22 have been disturbed within the zone to produce a bulked or textured yarn. Moreover, the high energy blow back air pours into the tapered passageway 32. The velocity of the air in the passageway 32 is swiftly reduced; air pressure is rapidly increased towards atmosphere. In effect, the energy of the blow back air is scattered or dissipated in the passageway 32 and therefore the air does not rake surface filaments along the yarns length to produce fuzz rings.

While the blow back air passing through the passageway 32 is generally diffused, it has a velocity gradient across the passageway 32 which varies with the distance away from the surface of the passageway. The greater the distance the higher the velocity. There is then, in a sense, an air flow separation from the diverging surface of the passageway 32 which results in an air core portion fiowing centrally within the passageway 32 generally along its longitudinal axis comprising higher velocity air with respect to the air nearer the surface of the passageway 32. Of course, the velocity of the central air portion is far below the velocity of the blow back air escaping through the needle passageway of prior texturing jets. Moreover, it is possible to reduce the velocity of the central air portion by increasing the angle of divergence of the passageway 32.

While the jet 10 may be operated successfully with the yarn entering the entrance guide passageway 32 at any path angle, improved processing occurs when the yarn follows a path advancing near the surface of the passageway 32. In practice, the jet 10 is disposed so that the longitudinal axis of the entrance guide passageway 32 is at an angle to the path of the yarn entering therein, see FIGURE 2. The path of the yarn proceeds close to the surface of the passageway 32 so that the higher velocities of the central air portion are avoided.

FIGURE 4 illustrates the jet 10 as described hereinabove; however, a yarn guiding nipple is used which employs a nipple passageway 52 having a more highly tapered truncated passageway section 54 than the passageway 32 of the nipple 30. Moreover, the passageway 52 employs a cylindrical portion 56 located at its forward end. In practice, the cylindrical portion 56 is exceedingly short, in the range of .O6.12 inch long; however, this length may be varied to obtain desired operating characteristics.

The more highly tapered nature of the portion 54 of the passageway 52 provides a zone capable of more rapidly dissipating the energy of the blow back air than the passageway 32 of the nipple 30. Further, a more highly tapered passageway has greater energy dissipating capacity, While a nipple passageway having an angle of taper of about 10-20 degrees from its longitudinal axis has been found adequate to dissipate the blow back air when moderate supply line pressures of from 40 to 90 p.s.i.g. are used to fill the jet 10, increased air pressure requires a zone having greater energy dissipation capacity.

Maximum advantage and jet operating flexibility are attained by dissipating the energy of the blow back air 1n a yarn guiding nipple passageway which is highly tapered. FIGURES 5 and 6 illustrate another form of a texturing jet employing the principles of the present inventron using a drastically tapered yarn guiding nipple passageway.

FIGURE 5 shows a yarn texturing jet which includes a tubular housing 72 open at both ends, which is similar to the housing 12 discussed hereinabove regarding jet 10. An aperture 73 positioned intenmediate the ends of housing 72 extends through the housings arcuate wall to provide an opening into which the supply line 88 is secured.

A circular plate 74 is appropriately fixed across the forward end of the housing 72. The plate 74 has a cylindrical passageway 78 formed by a flanged concentric opening extending normally from the face of plate 74 into the tubular housing 72 when the plate 74 is in position.

A cylindrical nozzle 80 is press fitted into the passageway 78. The nozzle 80 has a longitudinal venturi passageway 82 extending therethrough from end to end, which includes a converging section 84, a throat 85 and a divering section 86. The passageway 82 is the common outlet for the yarn and air supplied to the jet 70.

Appropriately held across the rearward end of the housing 72 is a highly tapered conical nipple 90. The nipple 90 is fastened to the housing 72 at its base and extends forward into the housing 72 in decreasing cross sectional area. While the nipple is shown as ending in the converging section 84 of the passageway 82, it may terminate anywhere in passageway 82 or short thereof. Extending through the nipple 90 from a larger cross sectional area at the bigger base end of the nipple 90 in decreasing cross sectional area at generally the same rate of reducing cross section is a passageway 92 having a smaller cross sectional area at the forward end of the nipple 90. Because of the highly tapered nature of the nipple 90 and passageway 92, the nipple 90 may, in a sense, be considered a concavo-convex plate or disc. The passageway 92 may have an angle of taper as high as 80 degrees or more from its longitudinal axis.

An internal chamber 87 is formed when the plate 74 and the yarn guiding nipple 90 are in place across the ends of the housing 72.

The jet 70 operates to texture or bulk yarn fed to it as described hereinabove regarding operation of the jet 10. Air under pressure is supplied to the internal chamber 87 through the supply line 88. Air escapes out the common outlet passageway 82 and the flow of blow back air occurs outwardly to the atmosphere through the tapered passageway 92. The energy of the blow back air is swiftly dissipated. The yarn supplied to the jet 70 is not adversely influenced by the energy of the blow back air.

FIGURE 6 illustrates the jet 70 of FIGURE 5 wherein a tapered conical yarn guiding nipple 100 is employed comprising two sections of varying taper, a base portion 101 and a forward tip portion 102. The base portion 101 is highly tapered, similar to the yarn guiding nipple 90; however, the forward tip portion 102 is move moderately tapered. Extending longitudinally through the nipple 100 from end to end is the passageway 103 which is a two sectioned passageway having a base or entrance section 104 and forward section 106. The passageway section 104 begins and terminates with the nipple base portion 101 and extends forward from a larger cross sectional area in decreasing cross section at generally the same rate of reducing cross section as the nipple portion 101. The section 106 is less tapered than the section 104, e.g. 10-20 degrees from the longitudinal axis and extends only a short distance, approximately .O6-.12 inch. The section 106 tapers at a rate generally the same as the nipple portion 102 and begins and ends therewith. Further, the section 106 extends from a maximum cross sectional area equal to the minimum cross sectional area of the section 102 to a smaller cross sectional area at the end of the nipple 100. The nipple 100 may end anywhere in the passageway 82 or terminate short thereof.

The preferred embodiments discussed and illustrated show the tapered nipple passageway of the invention to be generally a truncated cone or funnel having varying angles of taper. While such shape is preferred, the passageway of a yarn guiding nipple may be varied. For example, a passageway may have walls which extend as a truncated pyramid. Further, a passageway may flair as it extends away from a nipples forward end in increasing cross sectional area towards the base of a nipple. In fact, any passageway tapered in the direction of yarn movement extending the length or substantially the lentgh of the yarn guiding nipple is intended to be included within the scope of the invention.

Further, the invention may be used with a single continuous filament yarn input or multiple and separate yarn inputs making a composite textured or bulked yarn com prising core and eflect portions. Moreover, while the description oft he present invention has been made with particular reference to continuous filament glass yarn, the invention may be employed with any continuous filament yarn such as nylon, rayon, polyester and the like and synthetic or natural staple fiber yarns such as polyester and cotton.

Additionally, while the invention has been described in connection with air supplied under pressure to the jet, other gases and steam may be used.

It can be seen that the invention as described provides an effective entrance guide passageway through which input yarn may be fed to a texturing or bulking zone within a fluid jet without suffering the harsh effects of blow back" air inherent in prior texturing jets.

In view of the foregoing it will be recognized that while particular embodiments of the invention have been shown, many modifications may be made within the concept of the invention and, therefore, it is not the intent to limit the invention to specific embodiments.

I claim:

1. Apparatus for fluid treatment of a main body with a chamber therein;

an outlet from the chamber to the atmosphere through which yarn provided to the outlet exits, the outlet having a converging entrance from the chamber, a throat and a diverging exit;

a nipple extending through the chamber, the nipple having a passageway extending longitudinally there through in which the yarn provided to the passageway advances to the outlet, the passageway diminishing from a larger cross sectional area communicating with the atmosphere at the outer end of the nipple to a smaller cross sectional area at the inner end of the nipple, the inner end of the nipple terminating in the converging entrance of the outlet;

means supplying fluid to the chamber to effect treatment of the yarn, the fluid in the chamber being under pressure suflicient to cause fluid to leave the chamber both through the outlet and the passageway of the nipple.

2. Apparatus for fluid treatment of yarn according to claim 1 where the nipple is laterally offset with respect to the outlet.

3. Apparatus for fluid treatment of yarn according to claim 1 where the fluid is air.

4. Apparatus for fluid treatment of yarn according to claim 1 where said passageway is tapered along its entire length at a uniform rate of diminishing cross sectional area.

5. Apparatus for fluid treatment of yarn according to claim 4 where said passageway is a truncated cone.

6. Apparatus for fluid treatment of yarn comprising:

a main body with a chamber therein;

a nipple extending through the chamber, the nipple having a passageway extending longitudinally therethrough in which the yarn provided to the passageway advances to the outlet, the passageway comprising two sections, a first section extending from a maximum cross sectional area at the outer end of the nipple at a uniformly diminishing rate to its termination at a smaller cross sectional area intermediate the ends of the passageway, a second section extending from the termination of the first section, the second section having a uniform cross sectional area along its entire length equal to the cross sectional area of the first section at its termination, the second section being shorter than the first section, the nipple terminating in the converging entrance of the outlet; and

means supplying air to eflect fluid treatment of the yarn, the fluid in the chamber being under pressure yarn comprising:

7 8 sufiicient to cause fluid to leave the chamber both from a maximum cross sectional area at the outer end of through the outlet and the passageway of the nipple. said nipple at a uniformly diminishing cross sectional area 7. A jet for bulking yarn comprising: to its termination at a smaller cross sectional area intera main body having a chamber therein; mediate the ends of said passageway, a second section an outlet from the chamber to the atmosphere through extending from the termination of said first section at which yarn provided to the outlet exits, the outlet a maximum cross sectional area equal to the cross sechaving a converging entrance from the chamber, a tional area of said first section at its termination, said throat and adiverging exit; second section extending at an angle of taper smaller a nipple extending through the chamber, the nipple havthan said first section at a uniform rate of diminishing ing a passageway extending longitudinally there- 10 cross sectional area to a minimum cross sectional area through in which the yarn provided to the passageat the termination of said passageway at the inner end of Way advances to the outlet, the passageway having a said nipple within said jet, means supplying air under maximum cross sectional area at the outer nd f pressure to said chamber, an outlet from said chamber the nipple communicating with the atmosphere, the t0 the atmosphere for said y r and Said pp passageway being tapered along its entire length at a minating in said outlet and said passageway communicatuniform rate of diminishing cross sectional area from g i h a l the maximum cross sectional area to a minimum at A l for bulking y according to Claim 8 Where the inner end of the nipple, the inne e d f th said first section is substantially longer than said second nipple terminating in the converging entrance of the Sectionoutlet; and References Cited means for supplying air to the chamber to effect air UNITED STATES PATENTS treatment of the yarn, the air in the chamber being under sufficient pressure to cause air to leave the 2042743 6/1936 Taylor 57 34 X chamber both throu h the outl t d th 2,379,824 7/1945 Mummery 57 34 X of the nipple. g e an e passageway 3,050,430 8/1962 Gallagher 28-72 X 8. A jet for bulking yarn comprising a main body with gs u 2 5 a chamber therein, a n' l d ex er on Sal body extendmg 3,340,684 9/1967 Shichman 5734 through said chamber, said nipple having a passageway extending longitudinally therethrough, said passageway comprising two tapered sections, a first section extending LOUIS K. RIMRODT, Primary Examiner.