AU2004200042A1 - A cone of an elastic yarn and a method for producing the same - Google Patents

A cone of an elastic yarn and a method for producing the same Download PDF

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Publication number
AU2004200042A1
AU2004200042A1 AU2004200042A AU2004200042A AU2004200042A1 AU 2004200042 A1 AU2004200042 A1 AU 2004200042A1 AU 2004200042 A AU2004200042 A AU 2004200042A AU 2004200042 A AU2004200042 A AU 2004200042A AU 2004200042 A1 AU2004200042 A1 AU 2004200042A1
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AU
Australia
Prior art keywords
cone
winding
bobbin
elastic yarn
larger
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AU2004200042A
Inventor
Yoshihide Kawamura
Shigehide Kusakai
Hidekazu Sasaki
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Fuji Spinning Co Ltd
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Fuji Spinning Co Ltd
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Priority to JP2003-334923 priority Critical
Priority to JP2003334923A priority patent/JP2004142944A/en
Application filed by Fuji Spinning Co Ltd filed Critical Fuji Spinning Co Ltd
Publication of AU2004200042A1 publication Critical patent/AU2004200042A1/en
Abandoned legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H54/00Winding, coiling, or depositing filamentary material
    • B65H54/02Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
    • B65H54/28Traversing devices; Package-shaping arrangements
    • B65H54/2884Microprocessor-controlled traversing devices in so far the control is not special to one of the traversing devices of groups B65H54/2803 - B65H54/325 or group B65H54/38
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H55/00Wound packages of filamentary material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H55/00Wound packages of filamentary material
    • B65H55/04Wound packages of filamentary material characterised by method of winding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00Handled material; Storage means
    • B65H2701/30Handled filamentary material
    • B65H2701/31Textiles threads or artificial strands of filaments
    • B65H2701/319Elastic threads

Description

AUSTRALIA

PATENTS ACT 1990 COMPLETE SPECIFICATION NAME OF APPLICANT(S):: Fuji Spinning Co. Ltd.

ADDRESS FOR SERVICE: DAVIES COLLISON CAVE Patent Attorneys 1 Nicholson Street, Melbourne, 3000, Australia INVENTION TITLE: A cone of an elastic yar and a method for producing the same The following statement is a full description of this invention, including the best method of performing it known to me/us:-

SPECIFICATION

BACKGROUND OF THE INVENTION Technical Field Thepresentinventionrelatesto a methodforwinding an elastic yarn on a tapered bobbin in a favorable corn-like form. A cone of an elastic yarn obtained has a superior unwinding character, and can provide a wound yarn body of an elastic yarn having a form of corn suitable for supplying a yarn that is used in production field for industrial materials such as paper diaper and production fields for warp knitting and warping.

Prior Art A wound yarn body having a corn form obtainable by winding a yarn on a tapered bobbin with the yarn being traversed, is widely applied in winding of an usual spun yarn and a synthetic fiber yarn such as polyester and nylon, because it has a superior unwinding character when a yarn is taken out along the direction of an end face of cone from a fixed cone. However, since winding velocity of a bobbin is different between a larger diameter side and a smaller diameter side when the yarn is wound in a cone form, a tension of winding becomes higher at a larger diameter side of the bobbin where a winding velocity is higher, and a tension of winding becomes lower at a smaller diameter side of the bobbin where a winding velocity is lower. Thus, there is a problemthat adifferenceintensionofwindingis generated between a larger diameter side and a smaller diameter side.

This problem does not cause a practically serious obstacle with yarns having a low elongation which are conventionally used as stated above, but with yarns having a high elongation and low stress such as an elastic yarn of a bare polyurethane, winding on a tapered bobbin has not been employed because wound form becomes unfavorable due to the difference in tension of winding generated in winding on a tapered bobbin.

With regard to an elastic yarn, a cone of an elastic yarn for a paper diaper, which has a superior wound form and unwinding character with a winding amount of not lower than 1.5 kg and a value of (winding thickness) (winding width) of not lower than 0.4, is known (see Patent reference Said cone is suitable for unwinding the elastic yarn while the cone is revolved, but has a drawback, that is, a problem that the elastic yarn is caught by a lug of the cone resulting in a yarn breakage and the like, when the elastic yarn is unwound along the direction of an end face of the cone from the fixed cone. To improve such a drawback of the cone as described above, a cone of an elastic yarn which has a value of (winding thickness) (winding width) of lower than 0.4 using an elastic yarn comprising a dry spun polyurethane-urea is also known (see Patent reference However, each of these inventions relates to a parallel cheese as a fundamental form thereof, and when an elastic yarn is unwound along the direction of an end face of the cone from the fixed cone, an unwinding resistance is larger compared with that from a cone cheese, in particular, in the case of an elastic yarn of a bare polyurethane and the like, the large unwinding resistance causes problems such as yarn breakage and irregular feed tension.

Patent reference 1: JP-B-5-50429 Patent reference 2: JP-A-11-157750 DISCLOSURE OF THE INVENTION An object of the present invention is to provide a method for producing a cone of an elastic yarn, wherein an irregular tension in winding, that is, a difference of tension for winding between a larger diameter side and a smaller diameter side in a direction of width of a tapered bobbin generated in winding an elastic yarn having a high elongation and a low stress on a tapered bobbin, has been solved, in order to obtain a cone of an elastic yarn having a superior form and an unwinding character without exhibiting unfavorable winding of a cone.

The inventors of the present invention intensively studied to solve the above-described problem paying attention on adjusting a position of traverse support guide, and thus accomplished the present invention.

Namely, the present invention provides a cone of an elastic yarn obtainable by winding an elastic yarn on a tapered bobbin with the yarn being traversed, wherein an average value of unwinding resistance of an elastic yarn from said cone of an elastic yarn is in a range of 3.2 to 3.4 g. In the present invention, an elastic yarn is wound on a tapered bobbin with the elastic yarn being traversed to produce a cone of an elastic yarn, wherein a position of traverse support guide is moved so that a ratio (V 1

V

2 of winding velocity (V 1 at a smaller end face of a cone of the tapered bobbin to a winding velocity (V 2 at a larger end face of a cone of the tapered bobbin and a ratio (L 2 Li) of a linear distance (L 2 between a traverse support guide and a larger end face of a cone of the tapered bobbin to a linear distance (L 1 between a traverse support guide and a smaller end face of a cone of the tapered bobbin become nearly equal.

Here, it is preferable that the ratio (V 1

V

2 of winding velocity (V 1 at a smaller end face of a cone of the tapered bobbin to a winding velocity (V 2 at a larger end face of a cone of the tapered bobbin and the ratio (L 2

L

1 of a linear distance (L 2 between a traverse support guide and a larger end face of a cone of the tapered bobbin to a linear distance (L 1 between a traverse support guide and a smaller end face of a cone of the tapered bobbin, satisfies the following relation: 0.85 V 1

L

1

V

2

L

2 1.15.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a conceptual drawing of a bobbin driven type of winding machine equipped with a detection sensor and a control equipment to wind an elastic yarn on a tapered bobbin.

Fig. 2 is an explanatory drawing to illustrate positional relations and linear distances between each part of a tapered bobbin and a traverse support guide.

Fig. 3 is a graph showing a correlation when a linear distance between a larger end face of the tapered bobbin and a traverse support guide is continuously adjusted in accordance with a change of a yarn layer thickness of the cone of an elastic yarn.

Fig. 4 is a graph showing a correlation when a linear distance between a larger end face of the tapered bobbin and a traverse support guide is intermittently adjusted in accordance with a change of a yarn layer thickness of the cone of an elastic yarn.

Fig. 5 is an explanatory drawing to illustrate positional relations of a cone of an elastic yarn, a plate-like yarn guide, an apparatus for measuring unwinding resistance (a tension meter), and a draw roller when the cone of an elastic yarn is unwound.

Fig. 6 is an explanatory drawing to illustrate a state of ballooning in the vicinity of a yarn layer thickness of 0.08 m when a wound body of an elastic yarn having a form of a parallel cheese is unwound.

Fig. 7 is an explanatory drawing to illustrate a state of ballooning in the vicinity of a yarn layer thickness of 0.04 m when a wound body of an elastic yarn having a form of a parallel cheese is unwound.

BEST MODE FOR CARRYING OUT THE INVENTION Elastic yarn used in the present invention includes a polyurethane type of elastic yarn, a polyether type of elastic yarn, a polyester type of elastic yarn, a polyether-ester type of elastic yarn, a polyamide type of elastic yarn, a polycarbonate type of elastic yarn, a polybutylene terephthalate type of elastic yarn, and an elastic yarn obtainable by conjugating at least one of these elasticyarnsandothermaterials. Inparticular, theeffect of the present invention is remarkably exhibited when a bare polyurethane type of elastic yarn is used, which has a high elongation and a low stress and tends to easily tangle each other due to a large coefficient of friction of yarn surface.

The elastic yarn may be either of a monofilament or a multifilament, but a multifilament is preferable in the present invention. Further, the elastic yarn may be adhered with a surface treatment agent such as a lubricant, or may be a bare elastic yarn. With regard to fineness thereof, an elastic yarn having such a wide range as 70 to 1,200 denier can be used.

Wound yarn body of an elastic yarn with a cone form, to which the present invention relates, may be either of a usual cone form wherein winding is performed with almost the same width from the beginning to the end of winding and a so-called pineapple form wherein a winding width becomes gradually narrower as winding progresses from the beginning to the end thereof. Taper angle of a tapered bobbin used in the present invention may be, for example, in a range of 3030 to 9015 as usually used.

Cone of an elastic yarn of the present invention is produced according to the method described below, and a cone of an elastic yarn obtained has a specified value of unwinding resistance. Namely, an average value of the unwinding resistance is preferably 3.2g to 3.4 g. In particular, in a case of a bare polyurethane elastic yarn, a value less than 3.2 g tends to cause unwinding by inertia due to a too small unwindingresistance, resulting inproblems such as entanglement of the yarn. Contrary, a value over 3.4 g tends to cause yarn breakage or hinder smooth supply of the yarn.

Further, a deviation of unwinding resistance represented by the equation shown below is preferably 0.16 or less. A deviation over 0.16 is not preferable because a length of unwound elastic yarn is not stabilized due to a large dispersion of unwinding resistance, and for example, when an elastic yarn is used on a paper diaper manufacturing machine or a warp knitting machine, poor quality of a paper diaper or a warp knitting fabric produced may be resulted.

Deviation (Maximum value Minimum value) Deviation Average value Unwinding resistance of an elastic yarn of the corn is measured using a unwinding resistance measuring equipment.

For example, as described in Examples hereinbelow, an unwinding resistance is obtained by holding horizontally a corn of elastic yarn 11 rewound on a tapered bobbin, taking up the yarn at a velocity of 150 m/min through a plate-like yarn guide 12 equipped at the position apart by 0.46m from the rear end of the bobbin by a pair of rollers 13, 13 equipped at the position apart by 0.23m from said plate-like yarn guide 12, and measuring a tension of the elastic yarn by a tension meter 14 [model: PLS-0.2KC, made by NIDEC-SHIMPO CORPORATION] equipped at the position apart by 0.llm from said plate-like yarn guide 12.

Winding machine of a bobbin driven type, which is used for winding an elastic yarn on a tapered bobbin in the present invention, is composed of a commonly used winding machine equipped with detection sensors and a control equipment, and main parts thereof are shown in Fig. 1.

The winding machine used in the present invention may be used for direct winding of a spun elastic yarn, but is suitable for preferably rewinding from a wound body of an elastic yarn in a form of parallel cheese wound by the usual method. As a tapered bobbin, for example, bobbin 6 having a taper angle of 3030 or the like is used, and said tapered bobbin 6 is mounted to spindle 7.

The spindle 7 is driven by an inverter motor via a gear device, and preferably has an equipment by which winding velocity is controlled to be constant even when yarn layer thickness 5 of a cone of an elastic yarn wound on the tapered bobbin 6 is increased. It is checked by detection sensor for number of revolution of touch roller 3 whether the predetermined winding velocity is maintained or not, using a control equipment having an arithmetic section where calculation is performed based on information obtained from detection sensorforyarnlayerthickness 1, detectionsensor for number of revolution of spindle 2, and detection sensor for number of revolution of touch roller 3, and an output section from which a signal for maintaining a predetermined winding velocity is sent.

The cone of an elastic yarn to be supplied for rewinding is fixed by a supporting means which is not shown in the figure, and elastic yarn 10, via guides such as a snail wire, is wound on the tapered bobbin 6 under a predetermined contacting pressure by touch roller 8 in contact with the tapered bobbin 6, while it is traversed with traversing device 9 through the traverse support guide a. In this connection, when the elastic yarn 10 is unwound from the cone of an elastic yarn to be supplied for rewinding, preferably a drive roller to positively deliver the yarn is used to reduce an influence of fluctuation of tension due to unwinding resistance.

As the traversing device 9 used in the present invention, a type using a traverse guide guiding an elastic yarn which make a reciprocating motion by a cam roller, or a type to traverse an elastic yarn using a rotating blade can be used. Traversing velocity is calculated by an arithmetic section based on information obtained from detection sensor for number of revolution of spindle 2 and detection sensor for traversing velocity 4, so as tomaintain a winding number in a range of winding width from a position of beginning of winding at the larger diameter side of the cone and a position of beginning of winding at the smaller diameter side of the cone at a predetermined value, and a signal thereof is sent from the output section.

In the present invention, the detection sensor for yarn layer thickness 1 includes an ultrasonic sensor and alasersensor, the detection sensor for number of revolution of spindle 2 includes a photo-sensor and a proximity sensor, the detection sensor for number of revolution of touch roller 3 includes a photo-sensor and a proximity sensor, and a detection sensor for traversing velocity 4 includes a photo-sensor. Each of these sensors used in the present invention can be appropriately selected from the above sensors, respectively.

Controlequipmentfor a drivenbobbintypeofwinding machine to wind an elastic yarn on the tapered bobbin 6 is composed of a setting section, an arithmetic section and an output section. The setting section may be composed of an input device such as a keyboard and a memory device for the input values. The data to be input include form-dependent values of the tapered bobbin used such as taper angle a, bobbin width F, a linear distance between the larger end face of bobbin and a position of beginning of winding at the larger diameter side of the cone of bobbin E, winding width D (see Fig. and number of revolution of spindle and winding number in a range where the traverse guide traverses from a position of beginning of winding of the cone at the larger diameter side of bobbin to a position of beginning of winding of the cone at the smaller diameter side of bobbin, both of which are initially set values.

Further, the arithmetic section may be a section that can calculate a position of the traverse support guide being traversed via a servomotor based on form-dependent values of the tapered bobbin, initially set values of the setting section and information from each detection sensor, a number of revolution of the spindle to keep a winding velocity constant, and a traversing velocitytokeep a windingnumberin a rangewherethetraverse guide traverses from a position of beginning of winding of the cone at the larger diameter side of bobbin to a position of beginning of winding of the cone at the smaller diameter side of bobbin, always constant. In addition, the output section may be a section that can output a signal for changing a number of revolution of the spindle, a traversing velocity, and a position of the traverse support guide a, based on results of the calculation performed by the arithmetic section basedonform-dependentvaluesofthetaperedbobbin, initially set values of the setting section and information from each detection sensor.

Inthepresent invention, apositionofthetraverse support guide a is determined by calculating so that a ratio of a winding velocity at the smaller end face of a cone of the tapered bobbin on which an elastic yarn is wound, to a winding velocity at the larger end face of a cone of the tapered bobbin, and a ratio of a linear distance between the traverse support guide a and the larger end face of a cone of the bobbin to a linear distance between the traverse support guide a and the smaller end face of a cone of the tapered bobbin becomes equal, and providing a direction to move apositionofthetraversesupportguidea. Hereinafter this will be explained by referring to Fig. 2. **Fig. 2 is anexplanatorydrawingtoillustrate a positionalrelation of the cone of an elastic yarn wound on a tapered bobbin having taper angle a and the traverse support guide a, a positional relation of the center of a spindle and the traverse support guide a, a linear distance X between the traversesupportguide a andthelargerendfaceofthetapered bobbin, a linear distance L 2 between the traverse support guide a and the larger end face of cone of the tapered bobbin c, and a linear distance L 1 between the traverse support guide a and the smaller end face b of a cone of the tapered bobbin.

Winding velocity V 1 (m/sec) at the smaller end face of a cone of the tapered bobbin in the present invention is defined by the following equation from diameter A of the bobbin at a position of beginning of winding of a cone at the smaller diameter side of the tapered bobbin, yarn layer thickness G of a corn, traversing velocity I (m/sec) and number of revolution of the spindle SP (number/sec).

V

1 2G) p x Sp]2 12 )1/2 (1) Winding velocity V 2 (m/sec) at the larger end face of a cone of the tapered bobbin in the present invention is defined by the equation shown below from diameter B of the bobbin at a position of beginning of winding of a cone of the larger diameter side of the tapered bobbin, yarn layer thickness G of a cone, traversing velocity I (m/sec) and number of revolution of the spindle SP (number/sec).

V

2 2G) p x Sp]2 12 }112 (2) In addition, as stated in the present invention, a cone having a favorable form and a superior unwinding character can be obtained by calculating a position of the traverse support guide a, number of revolution of the spindle SP and traversing velocity I so that a ratio (L 2

L

1 of linear distance L 2 between the traverse support guide a and the larger end face c of a cone of the tapered bobbin to linear distance L, between the traverse support guide a and the smaller end face b of a cone of the tapered bobbin becomes equal to a ratio (V 1

V

2 of winding velocity V 1 (m/sec) at the smaller end face of a cone of the tapered bobbin, on which an elastic yarn is wound, to winding velocity

V

2 (m/sec) at the larger end face of a cone of the tapered bobbin, that is, so as to satisfy the following equation based on information obtained from detection sensor for yarn layer thickness i, detection sensor for number of revolution of spindle 2, and detection sensor for traversing velocity4, andoutputtingtheresults todetermine a position of the traverse support guide a.

VI V 2

L

2

L

1 (3) Wherein,

V

1 winding velocity at the smaller end face of a cone of the tapered bobbin (m/sec);

V

2 winding velocity at the larger end face of a cone of the tapered bobbin (m/sec); Li: Linear distance between the traverse support guide a and the smaller end face b of a cone of the bobbin; and

L

2 Linear distance between the traverse support guide a and the larger end face c of a cone of the bobbin.

Here, the linear distance L 2 between the traverse support guide a and the larger end face c of a cone of the bobbin is represented by the equation below, provided that a linear distance between the larger end face C of the bobbin and the traverse support guide a is X a linear distance between the larger end of the bobbin and a position of beginning of winding of a cone at the larger diameter side of the bobbin is E a linear distance of the center of spindle and the traverse support guide a isH a diameter of the bobbin at the position of beginning of winding of a cone at the larger diameter side of the tapered bobbin is B and a yarn layer thickness of the cone is G L2 E) 2 [H (B 2 G)] 2 )1/2 (4) Further, a linear distance L 1 between the traverse support guide a and the smaller end face b of a cone of the bobbin also is represented by the equation below, provided that a winding width is D a diameter of the bobbin at the position of beginning of winding of a cone at the smaller diameter side of the tapered bobbin is A L E X) 2 [H (A 2 G)] 2 )1/2 Further, the distance from the center of spindle and the traverse support guide H can be appropriately determined depending on a distance between each of bobbins mounted on a bobbin driven type of winding machine.

A position of the traverse support guide of the present invention is determined by the following procedures.

First, a taper angle which is a form-dependent value of the bobbin used, a width of the bobbin F a distance between a larger end of the bobbin and a position of beginning ofwindingE awoundwidthD andanumberof revolution of a spindle SP 0 (number/sec) and a winding number where a traverse guide transfers from a larger diameter side of the bobbin to that at a smaller diameter side thereof, both of which are initially setting values, are input. A diameter A of the bobbin at the position of beginning of winding in a smaller diameter side of the bobbin, and a diameter B of the bobbin at the position of beginning of winding in a larger diameter side of the bobbin, are calculated from the taper angle the width of the bobbin F a distance between a larger end of the bobbin and a position of beginning of winding E and a wound width D which were input, and an initial velocity of traverse I0 (m/sec) is calculated from an initial number of revolution of spindle SP 0 (number/sec) and a winding number during the traverse guide travels from a larger diameter side of the bobbin to a smaller diameter side thereof. Next, supposing that a yarn layer thickness of a cone at the beginning of winding Go 0 in the equations 1 and 2, a ratio (V 1

V

2 of a winding velocity

V

1 (m/sec) at a smaller end face of the tapered bobbin, to a winding velocity V 2 (m/sec) at a larger end face of the tapered bobbin, is calculated. Then, a position of the traverse support guide X0 is calculated so that a ratio (L 2

L

1 of a linear distance L 2 between a traverse support guide a and a larger end face o of a cone of the bobbin to a linear distance L 1 between a traverse support guide a and a smaller end face b of a cone of the bobbin becomes equal to the ratio (V 1

V

2 namely L 2

L

1

V

1

V

2 and is determined by selecting a positive value thereof.

In the equations 4 and 5, the diameter A of the bobbin at the position of beginning of winding in a smaller diameter side thereof, and the diameter B of the bobbin at the position of beginning of winding in a larger diameter side thereof, are values obtainable by the calculations as stated above, and a wound width D a distance between a larger diameter of the tapered bobbin and a position of beginning of winding of the cone in a larger diameter side thereof E and a linear distance of a spindle center and a traverse support guide H are the values initially input. Therefore, a ratio (L 2

L

1 of a linear distance

L

2 between a traverse support guide a and a larger end face c of the cone of a bobbin to a linear distance L 1 (m) between a traverse support guide a and a smaller end face b of the cone of a bobbin is a function of a yarn layer thickness of the cone G and a linear distance between a larger end face of a bobbin and a traverse support guide X Here, since the yarn layer thickness of the cone G (m) increases with time, L 2

L

1 varies with a linear distance between a larger end face of a bobbin and a traverse support guide a X L 2

L

1 is determined by calculating V 1

V

2 and a corresponding linear distance between a larger end face of a bobbin and a traverse support guide X becomes a solution of a quadratic equation, and the value thereof is essentially a positive one when a position of a traverse support guide at the beginning of winding is assumed to be

X

0 (min). A taper angle of the tapered bobbin used, a diameter of the bobbin and a width of the bobbin, may be appropriately selected, so long as the position of a traverse support guide at the beginning of winding X 0 is a positive value.

After the beginning of winding, a position of a traverse support guide X and linear distance between a larger end face of a bobbin are determined in the same manner as of the procedures used for the beginning of winding except that values measured by each sensor are used as a yarn layer thickness of the cone G a traversing velocity I (m/sec) and a number of revolution of a spindle SP (number/sec). A position of a traverse support guide is preferably controlled continuously as shown in Fig. 3, but may be controlled stepwise in accordance with a yarn layer thickness of the cone as shown in Fig. 4 within a range not affecting winding form and unwinding character.

Namely, in the present invention, a position of a traverse support guide is controlled so that the relation of L 2

L

1

V

1

V

2 is satisfied as described above, but the control may be performed continuously or stepwise within a certain range. Accordingly, in the present invention, the relation of L 2

L

1

V

1

V

2 is not necessarily required to be satisfied, but the both values are required to be almost same, and for example, the values within the following range are acceptable. When a value of the ratio 0.85 V 1

L

1

V

2

L

2 1.15 is smaller than 0.85, namely, a tension of a smaller diameter side is smaller than that of a larger diameter side, loose winding or wrinkles occurs at an end face of the smaller diameter side, and bulge winding, cob-webbing and the like occurs at a larger end face. On the other hand, when a value of the ratio is larger than 1.15, namely, a tension of a smaller diameter side is larger than that of a larger diameter side, wavy edges or cob-webbing occurs at a smaller end face, and thus a wound package having a favorable corn form cannot be obtained.

Conventionally, when a yarn having a high elongation and a low stress such as a polyurethane elastic yarn was wound on a tapered bobbin, there was a remarkable influence due to a difference in winding tension between a larger diameter side and a smaller diameter side of the tapered bobbin, and if a winding tension at a smaller diameter side of the bobbin was kept properly, awinding tension at a larger diameter side of the bobbin became excessively large, resulting in a problem of unfavorable winding such as traversing-off often occurred. Contrary, if a winding tension at a larger diameter side of the bobbin was kept properly, a winding tension at a smaller diameter side of the bobbin became weak, resulting in a tendency of often occurrence of loose winding or wrinles. Such a phenomenon became more remarkable as a winding amount increased, or as a taper angle of the tapered bobbin increased. However, in the present invention, as stated above, by winding with a position of a traverse support guide being moved, a cone of a polyurethane elastic yarn having a favorable form and an excellent unwinding character can be obtained.

Winding amount of a cone of an elastic yarn obtained by the present invention is not particularly limited, and may be not only 500 g to 1.5 kg of an usual winding amount, but also a winding amount of a corn of not lower than the range. In particular, the method of the present invention is suitable for a winding amount of not lower than 1.0 kg, and can be suitably used in various fields.

EXAMPLES

Hereinbelow, the present invention will be explained in detail by referring to Examples, but is not construed to be limited to this scope. In the Examples, a winding tension of a cone of elastic yarn having a form of cone was evaluated by measuring a value of unwinding resistance during unwinding an elastic yarn from a cone of elastic yarn. Values of unwinding resistance in these Examples were measured by using an apparatus for measuring an unwinding resistance as described below, and a deviation of unwinding resistance (a dispersion of unwinding resistance values) was calculated from the measured values obtained.

Method for measuring by using an apparatus for measuring unwinding resistance and an equation for calculating a deviation As shown inFig. 5, unwindingresistancewas obtained by holding horizontally a corn of elastic yarn 11 rewound on a tapered bobbin, taking up the yarn at a velocity of 150 m/min through a plate-like yarn guide 12 equipped at the position apart by 0.46m from the rear end of the bobbin by a pair of rollers 13, 13 equipped at the position apart by 0.23m from said plate-like yarn guide 12, and measuring a tension of the elastic yarn by a tension meter 14 [model: PLS-0.2KC, made by NIDEC SHIMPO CORPORATION] equipped at the position apart by 0.l11m from said plate-like yarn guide 12 at 3 points of 40 mm, 20 mm and 5 mm in yarn layer thickness of a corn of elastic yarn for 30 sec. per each point. A deviation of unwinding resistance values was calculated from the maximum value, the minimum value and the average value of the unwinding resistance obtained by the following equation (Maximum value Minimum value) (6) Deviation (6) Average value Example 1 Apolyurethaneelasticyarnof 46.62tex [Tradename: FUJIBO SPANDEX, manufactured by Fuji Spinning Co., Ltd.] having a weight of 3.0 kg, which was wound ina form of parallel cheese on a cylindrical bobbin and free of lubricant, was prepared. Then, as initially set values, a taper angle a 3o30 which is a form-dependent value of the bobbin used, a smaller diameter of the bobbin 0.047 m, a larger diameter C of the bobbin 0.075 m, a width F of the bobbin 0.2286 m, a linear distance E between a larger diameter end of a bobbin and a position of beginning of winding at a larger diameter side of a cone thereof 0.015 m, a winding width D 0.195 m, a linear distance H between a spindle center and a traverse support guide 0.2 m, an initial number of revolution of a spindle SP 0 24.77 number/sec, and a winding number during a period of the traverse guide moving from a larger diameter side of the bobbin to a smaller diameter side thereof 3.25, were input. Arithmetic values of a diameter A of the bobbin at the position of beginning of winding of a cone of a smaller diameter side of the tapered bobbin 0.0493 m, a diameter B of the bobbin at the position of beginning of winding of a cone of a larger diameter side of the tapered bobbin 0.0732 m, and an initial traversing velocity Io 1.49 m/sec, which were calculated from the initially set values input, were obtained. The arithmetic values obtained and an initial yarn layer thickness of a cone Go 0 m, were substituted in said equations and and calculated to obtain the arithmetic values of the winding velocity VI at a smaller end face of the tapered bobbin 4.12 m/sec and the winding velocity V 2 at a larger end face of the tapered bobbin 5.88 m/sec.

Calculation was performed by substituting the arithmetic values of a ratio of velocities V 1

V

2 0.70 obtained in said equations and to obtain a linear distance between a larger end face side of a bobbin and a traverse support guide of X 0 0.049 and -0.392. Adopting the positive value thereof, the traverse support guide was moved to a position of 0.049 m from a larger end face of a tapered bobbin by using a servomotor. Then, a number of revolution of a spindle was controlled to become an average speed 5.0 m/sec 300 m min of a winding velocity V 1 4.12 m/sec at a smaller end face of a cone of the tapered bobbin and a winding velocity V 2 5.88 m/sec at a larger end face of a cone of the tapered bobbin, and a traversing velocity was controlled to maintain a winding number 3.25 during a period of the traverse guide moving from a larger diameter side to a smaller diameter side, and further a position of the traversesupport guide was controlled so that a ratio (L 2

L

1 of a linear distance L 2 between a traverse support guide, which varied with an increase of a yarn layer thickness of a cone, and a larger end face of a cone of the bobbin to a linear distance L 1 between a traverse support guide and a smaller end face of a cone of the bobbin, became equal to a ratio (V 1

V

2 of a winding velocity V 1 (m/sec) at a smaller end face of a cone of the tapered bobbin to a winding velocity V 2 (m/sec) at a larger end face of a cone of the tapered bobbin, to produce 3 kg of a cone of polyurethane elastic yarn having a corn form.

Results of appearance examination on a wound yarn body of polyurethane elastic yarn having a corn form, measurements of unwinding resistances at 40 mm, 20mm, and mm of yarn layer thickness, deviations of unwinding resistance, and examination on winding states of a polyurethane elastic yarn in the most inner layer within a yarn layer thickness of 2 mm, are shown in Table 1.

Table 1 Result of apparace Winding form was cone-like and favorable appearance without deformation.

examination Thickness of Unwinding resistance (g) yarn layer Deviation (mm) Maximum Minimum Average mm 3.4 2.9 3.2 0.16 mm 3.5 3.0 3.3 0.15 mm 3.6 3.1 3.4 0.15 Almost uniform tension was obtained without 2 mm or less loosening of a polyurethane elastic yarn in the most inner layer.

From Table 1, it can be seen that average values of unwinding resistances are in a range of 3.2 to 3.4, though those at the beginning of winding tend to have slightly higher values, and a deviation thereof resides in a range of 0.15 to 0.16. Thus, a wound yarn body of polyurethane elastic yarn having a cone form and a superior unwinding character was obtained, and further both of end faces of a corn package were almost plane-like. Further, an appearance and a winding state in each yarn layer were also superior.

Comparative Example 1 Using the same polyurethane elastic yarn of 46.62 tex having a winding amount of 3 kg as in Example 1, and a tapered bobbin having the same form-dependent value as in Example 1, 3 kg of a cone of polyurethane elastic yarn having a corn form was produced at a winding velocity of 300 m/min by using a bobbin driven style of winding machine with a traverse support guide fixed at a position apart by 0.03 m from a larger end face of a tapered bobbin without moving.

In the samewayas in Example 1, results of appearance examination on a wound yarn body of polyurethane elastic yarn having a corn form, measurements of unwinding resistances at 40 mm, 20 mm, and 5 mm of yarn layer thickness, deviations of unwinding resistance values, and examination on wound states of polyurethane elastic yarn within the most inner layer of 2 mm of yarn layer thickness, are shown in Table 2.

Table 2 Result of Result of Occurrences of bulge winding and wrinkles appearance pexamat were observed.

examination Thickness of Unwinding resistance (g) yarn layer Deviation (mm) Maximum Minimum Average mm 4.3 3.4 3.9 0.23 mm 4.3 3.4 4.1 0.22 mm 4.4 3.8 4.2 0.14 Almost uniform tension was obtained without 2 mm or less loosening of a polyurethane elastic yarn in the most inner layer.

C

From Table 2, it can be seen that average values of unwinding resistance are in a range of 3.9 to 4.2, and the value at the beginning of winding tend to show a higher value and gradually lower, but deviations of unwinding resistance arehighercomparedwiththose inExample 1. With regard to results of appearance examination, the appearance was poor with bulge winding having a wrinkles at the smaller end face of the bobbin, and thus a cone of a polyurethane elastic yarn having a favorable unwinding property could not be obtained.

Comparative Example 2 By the same way as in Comparative Example 1 except that a position of the traverse support guide was fixed at a position apart by 0.11 m from a larger end face of the tapered bobbin, 3 kg of a wound yarn body of polyurethane elastic yarn having a cone form was produced at a winding velocity of 300 m/min by using a bobbin driven type of winding machine.

Results of the appearance examination on the cone of polyurethane elastic yarn having a cone form obtained, the measurements of unwinding resistances at 40 mm, 20 mm and 5 mm in yarn layer thickness, the calculations of deviations of unwinding resistance, and the examination on wound states of a polyurethane elastic yarn within the most inner layer within 2 mm of yarn layer thickness, are shown in Table 3.

Table 3 Result of Result of Wound form was favorable without appearance deformation.

examination Thickness of Unwinding resistance (g) yarn layer Deviation (mm) Maximum Minimum Average mm 4.0 3.5 3.7 0.14 mm 4.2 3.4 3.8 0.21 mm 4.3 3.4 3.8 0.24 2 mm Loose winding of a polyurethane elastic yarn or less occurred in the most inner layer.

From Table 3, it can be seen that average values of unwinding resistance are in a range of 3.7 to 3.8 and almost in the same level, but deviations thereof are higher compared with those in Example i. The result of appearance examination was favorable, but loose winding of a polyurethane elastic yarn was generated in the most inner layer, and therefore this was not a cone of polyurethane elastic yarn having a superior unwinding character.

Reference Example Using a cone of a polyurethane elastic yarn of 44.62 tex and free of lubricant having a form of parallel cheese with a winding amount of 3.0 kg, which was used in Example i, an unwinding resistance was measured by using an apparatus for measuring unwinding resistance as described in Example, and deviations were calculated from the results the measurements. Results are shown in Table 4. A cone of a polyurethane elastic yarn having a form of parallel cheese with a winding amount of 3 kg, was wound at a diameter of bobbin of 0.085 m, awidth of the bobbin of 0.1143 m, awinding width of 0.096 m, and a yarn layer thickness of 0.095 m.

Measurements of unwinding resistance were made at three points of 80 mm, 40 mm and Table 4 Thickness Unwinding resistance (g) of yarn Deviation layer (mm) Maximum Minimum Average mm 9.8 2.8 4.2 1.67 mm 3.8 2.8 3.2 0.31 mm 3.5 2.9 3.1 0.19 From Table 4, it can be seen that average values of unwinding resistance are in a range of 3.1 to 4.2 and uneven, and deviations thereof are larger and in a range of 0.19tol.67. At a yarnlayerthicknessof in unwinding is large as shown in Fig. 6. Although a ballooning state becomes moderate at a yarn layer thickness of 40 mm as shown in Fig. 7, but deviations of unwinding resistance were larger and fluctuation in tension was larger compared with those of the cone of a polyurethane elastic yarn of the present invention.

EFFECT OF THE INVENTION A wound yarn body of a polyurethane elastic yarn having a corn form obtainable according to the method of the present invention does not exhibit an unfavorable form in appearance, nor loose winding in an inner layer of a cone, and exhibits a superior unwinding character with less variation of tension due to a small deviation of unwinding resistance, and thus has enabled to wind a bare polyurethane elastic yarn on a tapered bobbin.

INDUSTRIAL APPLICABILITY The cone of a bare polyurethane elastic yarn having a corn form obtained by the present invention has a superior unwinding character, a small deviation of unwinding resistance and a small dispersion of tension, without exhibiting an unfavorable form in appearance and a loose batching in the most inner layer of a corn. Further, a winding amount of a package can be arbitrarily set, in particular, a cone having a larger winding amount than usual can be produced. Thus, the cone of the present invention can be suitably used in a production field for paper diaper and the like or a production fields for warp knitting and the like.

Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.

The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement or any form of suggestion that that prior art forms part of the common general knowledge in Australia.

Claims (4)

  1. 2. The cone of an elastic yarn according to Claim i, wherein said elastic yarn is a bare polyurethane type of elastic yarn.
  2. 3. The cone of an elastic yarn according to Claim 1 or Claim 2, wherein, in winding said elastic yarn on a tapered bobbin with said elastic yarn being traversed, a position of traverse support guide is moved so that a ratio (V 1 V 2 of winding velocity (V 1 at a smaller end face of a cone of said tapered bobbin to a winding velocity (V 2 at a larger end face of a cone of said tapered bobbin and a ratio (L 2 Lj) of a linear distance (L 2 between the traverse support guide and the larger end face of a cone of said tapered bobbin to a linear distance (L 1 between the traverse support guide and the smaller end face of a cone of the tapered bobbin becomes nearly equal.
  3. 4. The cone of an elastic yarn according to Claim 3, wherein a ratio (V 1 V 2 of winding velocity (V 1 at a smaller end face of a cone of said tapered bobbin to a winding velocity (V 2 at a larger end face of a cone of said tapered bobbin and a ratio (L 2 L 1 of a linear distance (L 2 between the traverse support guide and the larger end face of a cone of said tapered bobbin to a linear distance (Li) between the traverse support guide and the smaller end face of a cone of the tapered bobbin satisfy the relation of 0.85 V 1 L 1 V 2 L 2 1.15. A method for producing a cone of an elastic yarn,. wherein in winding said elastic yarn on a tapered bobbin with said elasticyarn being traversed, apositionof traverse support guide is moved so that a ratio (V 1 V 2 of winding velocity (V 1 at a smaller end face of a cone of said tapered bobbin to a winding velocity (V 2 at a larger end face of a cone of said tapered bobbin and a ratio (L 2 L 1 of a linear distance (L 2 between the traverse support guide and the larger end face of a cone of said tapered bobbin to a linear distance (L 1 between the traverse support guide and the smaller end face of a cone of the tapered bobbin becomes nearly equal.
  4. 6. The method for producing a cone of an elastic yarn according to claim 5, wherein a ratio (V 1 V 2 of winding velocity (V 1 at a smaller end face of a cone of said tapered bobbin to a winding velocity (V 2 at a larger end face of a cone of said tapered bobbin and a ratio (L 2 L 1 of a linear distance (L 2 between the traverse support guide and the larger end face of a cone of said tapered bobbin to a linear distance (L 1 between the traverse support guide and the smaller end face of a cone of the tapered bobbin satisfy the relation of 0.85 V 1 L 1 V 2 L 2 5 1.15. A cone of an elastic yam substantially as hereinbefore described with reference to the drawings and/or Examples. A method for producing a yam cone substantially as hereinbefore described with reference to the drawings and/or Examples. The steps, features, compositions and compounds disclosed herein or referred to or indicated in the specification and/or claims of this application, individually or collectively, and any and all combinations of any two or more of said steps or features. DATED this SIXTH day of JANUARY 2004 Fuji Spinning Co. Ltd. by DAVIES COLLISON CAVE Patent Attorneys for the applicant(s)
AU2004200042A 2002-09-30 2004-01-06 A cone of an elastic yarn and a method for producing the same Abandoned AU2004200042A1 (en)

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JP2015178403A (en) * 2014-03-19 2015-10-08 村田機械株式会社 Yarn winding machine and winding method
CZ2015189A3 (en) * 2015-03-17 2016-11-16 Rieter Cz S.R.O. Textile machine with continuous supply of produced yarn and winding of yarn onto cross-wound taper bobbin

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