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FABRIC MANUFACTURESALIENT FEATURES OF MODERN AUTOCONER BY, GROUP - 8AUTOCONER - SPLICING TECHNOLOGYA high degree of yarn quality is impossible through knot, as the knot itself is objectionable due to its physical dimension, appearance and problems during downstream processes.

The knots are responsible for 30 to 60% of stoppages in weaving.

Splicing is the ultimate methodto eliminate yarn faults and problems of knots and piecing. It is universally acceptable and functionally reliable.This is in spite of the fact that the tensile strength of the yarn with knot is superior to that of yarn with splice.

Splicing is techniques of joining two yarn ends by inter mingling the constituent fibers so that the joint is not significantly different in appearance and mechanical properties with respect to the parent yarn.

The effectiveness of splicing is primarily dependent on the tensile strength and physical appearance.

Splicing satisfiesthe demand for knot free yarn joining:

no thickening of the thread or only slight increase in its normal diameterno great mass variation visibly unobjectionable no mechanical obstruction high breaking strength close to that of the basic yarn under both static and dynamic loadingalmost equal elasticity in the joint and basic yarn. In addition, splicing enables a higher degree of yarn clearing to be obtained on the electronic yarn clearer.

Splicing technology has grown so rapidly in the recent past that automatic knotters on modern high speed winding machine are a thing of the past. DIFFERENT TECHNIQUES FOR SPLICINGElectrostatic splicingMechanical splicingPneumatic splicing

Among them, pneumatic splicing is the most popular.

Other methods have inherent drawbacks like limited fields of application, high cost of manufacturing, maintenance and operations, improper structure and properties of yarn produced.PNEUMATIC SPLICINGPRINCIPLE:The splicing consists of untwisting and later re-twisting two yarn ends using air blast, i.e., first the yarn is opened, the fibers intermingled and later twisted in the same direction as that of the parent yarn. Splicing proceeds in two stages with two different air blasts of different intensity. The first air blast untwists and causes opening of the free ends. The untwisted fibers are then intermingled and twisted in the same direction as that of parent yarn by another air blast. TwistingThe two yarn ends comprising the splice are twisted around the body of the yarn, each yarn strand twists on the body of the yarn on either side of the middle of the splice.

The cross-section of this region distinctly shows the fibers of the two yarn strands separately without any intermingling of the fibers. Tucking / InterminglingThe middle portion of the splice is a region (2-5 mm) with no distinct order.

The fibers from each yarn end intermingle in this splice zone just by tucking.

The studies on quantitative contribution of splice elements showed that intermingling/tucking contributes the most to the strength of splice (52%), followed by twisting (33%) and wrapping (about 15%). The lower strength of the splice is attributed to the lower packing coefficient of the splice zone Spliced yarn has a lower breaking elongation than normal yarn. Breaking elongation is mainly affected by intermingling. Wrapping and twisting provides mainly transverse forces. The absence of fiber migration gives lower breaking elongation to splice.

Universal Splicing ProcedureThe Autoconer splicing process consists of the partial processes:

Positioning of the yarns

Sucking up of the yarn ends

Loosening and opening of the yarn ends Pulling the yarn back into the prism

Intermingling and twist insertion

Splice achieving procedureStep 1:Suction arm (1) and suction pipe (2) transport the yarn ends to be spliced. The suction pipe shutter (3) guides both,lower and upper yarn end.The suction pipe shutter (3) pushes the upper end broughtdown by the suction arm (1) into the channel of the splicer prism(4).

Step 2:Yarn clamps (5 and6) close, separately clamping upper andlower end.Opening valve releases compressed air for yarn end opening.Both, shears (7 and 8) close.Feeder (9) and lid (10) begin their motion, shifting to theright.

Step 3:Shears (7) cut the lower end; shears (8) cut the upper end.The cut-off surplus ends are evacuated through suction armand suction pipe.Retainer tubes (11 and12) inhale upper and lower end and open both yarn ends in preparation for splicing.The feeder pulls the opened yarn ends out of their retainertubes(11 and 12).

Step 4:The feeder has pulled the yarn ends completely out of theretainer tubes (11 and 12), placing them next to each other with defined overlapping into the splicing prism.The opening valve closes, shutting off the opening air.The splicing valve releases compressed air to the prism. The air jet whirls the two yarn ends together, forming a spliced yarn joint.

Step 5:Lid, clamps, shears, and feeder release the readily spliced yarn and return to neutralposition.

Step 6:The winding unit starts. Feeder (9) and lid (10) have returned to neutral position. The suction pipe shutter (3) alsoreleases the readily spliced yarn.

Step 7:All control parts have returned to neutral position.The clearer tests the spliced joint.

Pneumatic SplicingThe first generation of splicing systems operated with just one stage without proceeding to trimming. The yarn ends were fed into the splicing chamber and pieced together in one operation. Short fibers, highly twisted and fine yarns could not be joined satisfactorily with such method. Latest methods of splicing process consist of two operations. During the first stage, the ends are untwisted, to achieve a near parallel arrangement of fibers. In a second operation the prepared ends are laid and twisted together. The Standard splicer is the basic type of the modular-design splicer, which hasbeen proving its worth in textile mills for decades. It can be used for all standard applications, producing reproducible spliced joints of high quality. The spliced joints are convincing by theirhigh strength values, very good visual appearance and excellent processing properties.Loosening and opening of the yarn ends and splicing the yarn ends together is achieved by atargeted air jet and entangling the fibers in an air whirl.ApplicationsCotton

Cotton Blends

PET

CV

Cotton compact yarnsThe standard splicers can be converted intoThermo splicer

Injection-Splicer

Elasto splicer.

All these variants are based on the principle of air splicing and their functionality is adapted to suit the specific requirements of the material to be spliced.

The Injection splicer with dosing valveThe use of the Injection splicer is recommended for splicing single and plied yarns of vegetable fibers, for example, coarse single and plied cotton yarns, OE-rotor yarns, CO compact yarns or yarns with astrongly marked inhomogeneous structure or very high twist.

The standard pneumatic splicing processis optimized in the addition of a small quantity of water through an electro-magnetic dosing valve, which intensifies the effect of the whirling of the fiber ends.ApplicationsCoarse CO yarns

Plied yarns

OE-rotor yarns

Linen yarns

Compact yarnsThe Elasto splicerThe Elasto splicer is particularly useful for the splicing of elastic Core yarns. Its specific features, including special braking elements, modified clamping and cutting lines and optimized control software, ensure safe and smooth processing of these springy yarns. The Elasto splicer can also be combined with the injection splicing facility. Strength and visual appearance of the spliced joints made with the Elasto splicer are of the excellent quality. Equally important is, that these spliced joints exhibit a high resistance to the alternating stresses to which they are subjected in weaving and that theymaintain their characteristic elasticity for knitting.Applications:CO/EL

CV/EL

Other blends with elastane.The Thermo splicerThe Thermo splicer is used for the splicing of wool yarns and blends of these. The pneumatic splicing process is optimized by tuning the splicing air temperature to the specific propertiesof the yarn spliced. The localized application of heated splicing air allows making optimal useof the thermoplastic properties of the fibers. The result is stable thermo-setting of yarnstructure in the zone of the spliced joint and, hence, significantly higher strength of the splice.ApplicationsWO

WO blends

Siro yarns

WO compact yarns

WO/ELSpecific performance criteria of theAutoconer splicing processGreat flexibility in the textile application.

Exact reproducibility and outstanding uniformity of the spliced joints.

High process stability.

Easy operation.

AUTOCONER - 338 Yarn splicing is one of the central functions of the winding machine.

With the Autoconer 338, Schlafhorst is a competent partner of ring spinners worldwide in the mastery of the complexities of the splicing technology.

The Schlafhorst splicing system is superior because it is of modular design.

The basic splicing system can be optimized at any time to adapt it to the requirements of yarns with new, different structures and characteristics.

AUTOCONER - 338

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