Raschel machines are useful because they can process all yarn types in all forms (filament, staple, combed, carded, etc.). 0000399663 00000 n

(PDF) Warp Knitting 1 | Gopalakrishnan Duraisamy - Academia.edu Circular knitting machine is the first choice for knitted fabric manufacturers. 0000052712 00000 n

The longer the underlap, the more it lies at right angles to the fabric length axis. 0000006158 00000 n Yarn, Optimum Drafting Conditions of Polyester and Viscose Blend Yarns, Essential elements of selection of a third party testing lab in…, Fusing Process and its Requirement in Garment Making, Textile Fabric Types – different types of fabrics and…, Types of Woven Fabrics – universally used fabric names, An exclusive information portal on textiles. W�~� ��`r ���v��-�j��'�t��8�S�2�aA�!+�7!� x ǜ/��'O�y_i��z=n�i{��u�c�ON�?����՛�M�r|��_V9������������f�ӧ�� ���6!�,҈t"�H�G�;#vF�)�Ƌ+�V��[��ŎR����E�Q��9��Z�iE��� ��P�@"�>�}� �A������$���O��l'��L�"Ů�ߊ�}�7��"E�D���%$y%�+I^��F� �6�X"!��_���b�A,��b�:���*)�Ϊ������������+ >���e_I��. 0000105400 00000 n

0000043129 00000 n

0000020648 00000 n 403 0 obj <>stream There two two movements of guide bar in a knitting machine.

The length of the underlap also influences the fabric weight. In order to connect the loops into a fabric , the yarns are shifted between the needles . endobj The one end of the guide bar arm is lifted up and lowered down , the other end of the same connected to the rocking shaft causes angular movement on the rocking shaft . 0000382175 00000 n The aim of this paper is to present a 3D straight line model for two‐guide‐bar warp knitted fabrics. Textile School - a knowledge-base repository of textile articles. 0000005532 00000 n endstream endobj 107 0 obj<> endobj 109 0 obj<> endobj 110 0 obj<>/Font<>/XObject<>/ProcSet[/PDF/Text/ImageC]/ExtGState<>/Properties<>>> endobj 111 0 obj<> endobj 112 0 obj<> endobj 113 0 obj<> endobj 114 0 obj<> endobj 115 0 obj<> endobj 116 0 obj<> endobj 117 0 obj<> endobj 118 0 obj<> endobj 119 0 obj<> endobj 120 0 obj<>stream 0000025588 00000 n Textiles startxref The shogging movement of guide bar is the lateral movement of guides which is parallel to the needle bar. trailer

In order to feed the yarn to the needle for loop formation as well as to connect the adjacent wales , the guides of a guide bar are required to execute a compound lapping movement . The reciprocating movements of the yarn, therefore, cause the stitch of each knitted course to incline in the same direction, alternately to the left and to the right. 0000002346 00000 n 0000041719 00000 n 0000001752 00000 n 0000585569 00000 n 0000010473 00000 n <>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.32 841.92] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> This movement wraps the yarn around the needle ready for the knock-over displacement. 0000005212 00000 n

3 . \��0Uߺ�2U�+Sl��w4Z���7S�k�:���}�!q燫w�������ٵ����. The throat of the sinker will be used to holding the fabric while the needles lifted up.
The occurrence , direction , timing and extent of each shog is separately controlled for each guide bar by using pattern chain links or pattern wheels . 0000048647 00000 n h�d�_k�0�rߪ�����Rpi7�dZ�MJ�?�#�o�F��9p��d��6�fwAt���(ǏO9.o��7��38�頸� ]Ә&�&���V��~W���t�e-ߴ��3Z8�Ua���/� �jT��;�^�Ƣ��I����2��v�nI�8�A{ǜ�V�4f����U�?�{�A�?���sȟ��m�(�9���*;�� #�T� 243 26 0000032396 00000 n The second part of stitch formation is the length of yarn linking together the stitches and this is termed the underlap, which is formed by the lateral movement of the yarns across the needles.


The sinker is thin plate of metal which is placed in between two needles . 0000586587 00000 n 0000104880 00000 n

}��,����ڶR� m'*���M/�� O��_�"maq�5sj�����}Շ�Δ��. Fabric 0000104972 00000 n Raw materials for the production of nonwovens, Linen Fiber and Linen Fabrics from the Flax Plants, Natural Cellulose Fibers – natures own fibers.

Its essential when the warp knitting machine using bearded needles for closing the hook of the needle. So that instead of giving motion to individual needles , all the are connected to bar is called needle bar . 0000003989 00000 n All the yarns will be knitted in course simultaneously. 0000039263 00000 n 10 . however warp knitting condition on mechanical properties have not been investigated. 0000026240 00000 n In warp knitting, every knitting needle is supplied with at least one separate yarn. ( such as similar to pattern cylinder in dobby loom ).
Warp knitting machines are flat and comparatively more complicated than weft knitting machines. When knitting with a longer underlap, more yarn has to be supplied to the knitting needles. M/CDescription: Compound needle is used in the m/c. The sinkers are almost have forward and backward direction through the sinker bar . The loops are joined together in a widthwise direction by moving the threads back and forth between adjacent needles. endobj %%EOF Warp knitting is the sequential formation and interlinking of loops in an axial direction on a lateral array of needles with at least one separate thread being supplied to each needle. Specifically for the knitting industry, Groz-Beckert offers more than 12,000 high-performance needles, system parts and knitting cylinders. �O>;O�>0-2��N����le�J��:�f�o^�N_������:���e}��N�|�˳�v�X~N��2�e-��K>OAZ������������}pg������˖�y?찖)e�2����J�H��'��~�W�`v�6(���/�w��?|���xq���'*�� Sw~&W�~��{�׵{}{�����/v��߸��!O���ÿ�ww����w��p�����AKs�h)���T�K�'��"w���� |&qH�gd��X$������ �#����"�Y�p��O���O.�_]��{��wW����Ii]��%')M�͘���{zN�r���?����'�����q��� *����x�ct�: The ‘Tricot’ warp knitting m/c is also termed as automatic warp knitting of its function. R�Y]��-��iJ�3��������7����.zκt)��R*=}%?y�&Ud0P\�*�md��S�����B)������}sw�Vo���)���u3��Ƀ��a�S�.dz�h�c�Bs'����@ͼ�b��y�l�"M�l�w�֙����� Ht�4 ԫ���,5:\h}���S$O��r9%rB���5]A!I�����;�T����'*�)��ChT��txѡ�� &�=,�N3�A+������;$۹�&��nE$&-_�iB:�1�v2�s�+K���Ti�0��Z�S�Ɠ�;R���Q��D� 0000032357 00000 n <<60f1a11f76f30b45adf2a8a37de598d6>]>> 15 . 0000007483 00000 n 0000031454 00000 n It will be lifted up and lowered down by means of a cam fitted outside the machine . 8 . We can use more than one guide bar . In warp knitting , fabric is made by forming loops from yarns coming in parallel sheet form run in the direction of fabric formation . In order to control both the lateral and longitudinal properties, as well as to produce an improved fabric appearance with erect loops, the second set of yarns is usually employed. The yarns are fed from warp beams to a row of needles extending across the width of the machine. %PDF-1.5 9 . DOp;�)0�f�d����@b��m�5�O���x�`���� ����� ?�� GG�?P�N#C� because yarn consumption will be vary. Warp knitting represents the fastest method of producing fabric from yarns. In order to connect the stitches to form a fabric, the yarns are deflected laterally between the needles. The shogging motion of guides either left to right or right to left. Major changes in the direction of the thread should be performed only by means of rotating guiding devices or pulleys in order to avoid congestion and variations in the tension of the individual threads. 0000039224 00000 n In this study, differences of warp knitting structure and tension on the structure of NCF and mechanical properties on NCF composites were investigated. The sinkers were driven by crank or eccentric arrangement . The underlap crosses and covers more wales on its way, with the result that the fabric becomes heavier, thicker and denser. h��Y�n7�}i��;ظ�-���`�a�L�E�]c2��ш3{��ӦhQ W3�H�����*z� 1=��� � ��� The diagram shows the path taken by the eyelet of one yarn guide traveling through the needle line, making a lateral overlap (shog) and making a return swing. The guide bar motion is expressed in terms of needles . The second set is usually moved in the opposite direction to the first in order to help balance the lateral forces on the needles.

The motion will be derived from the main cam shaft and it passes motion to guide bar via levers , pivots and linkages . 2 0 obj The fabric is produced in sheet or flat form using one or more sets of warp yarns. Z�$��� Underlap will be decided by the guide bar movement . 0000061558 00000 n It is widely used throughout the knitting industry to produce fabric for its productivity and user friendliness. Tricot and combination as a knitting structure, and different knitting tension was chosen for the fabrication of NCF. 0000105749 00000 n 0000041756 00000 n The extent of shog may vary from cycle to cycle . 0000003250 00000 n Loop formed by the yarn is called overlap. Importance of evaluation of PPE for medical personnel to combat…, Comparison of Cleaning Treatments for Conservation and Restoration…, How to Choose a Sewing Machine: Top Tips for a Newbie Learner, Types of textile fibers – list of textile fibers by its…, Knitted fabrics and types – list of knitted fabrics, This website uses cookies to improve your experience. The loops are joined together in a width-wise direction by moving the threads back and forth between adjacent needles. ( one needle movement , two needle movement ). With the help of the pattern drum and the chain link the patterning is done. �#&B�� a��� Guides are the metal plates drilled with a hole in their lower end. 106 0 obj<> endobj Since the underlap is connected to the root of the stitch, it causes a lateral displacement in the root of the stitch due to the warp tension. xref 0000049188 00000 n 0000003974 00000 n

0000002425 00000 n A warp knitted structure is made up of two parts. The first is the stitch itself, which is formed by wrapping the yarn around the needle and drawing it through the previously knitted loop. 11 . H��KnG�O�wȥ$��̌��V�� ��������R�c��1��+�&�U�����wjv������++���������λ�������f��.�[�; T�Zq'�=\/׾uw���#]�S�|��O���z It is formed when the over lap and the following under lap is formed in the opposite direction . Save my name, email, and website in this browser for the next time I comment.

When two guide bars have different motion during the knitting cycle the let off mechanism for both will be different .

Warp knitting can also be used to make pile fabrics often used for upholstery. 0000025699 00000 n 6 . 0000000816 00000 n 13 . Studying Textile Engineering at Anna University , Chennai, Fundamentals Of Warp Knitting | Warp Knitting Elements, Denim Wet Process | Bleach Wash | Acid Wash, Garment Finishing | Pressing | Flow Chart of Garment Finishing, Quality Control | AQL (Acceptance Quality Level), Colour Fastness of Textiles | Color Fastness To Washing, Colour Fastness of Textiles | Colour Fastness to Light, Inspection | Steps in Garments Inspection, Cutting Section in Apparel Industry | Cutting Room Terminology, Textile Testing and Quality Control – TTQC, Effect Of Sliver Handling On Quality Of Sliver And Yarn, Raschel Warp Knitting Machine Application, Basic Element of Woven Design (Drafting, Lifting & Denting Plan), Elongated Twill Weave and Combined Twill Weave, Melt Spinning , Dry spinning and Wet Spinning Method, Melt Spinning , Dry spinning and Wet Spinning Method (36537). endstream endobj 404 0 obj <>stream 5 . Due to the angular movement of the rocking shaft , the guide bar arm also move front and back and vice versa .Ultimately the swinging motion of guide bar will be achieved . The gears are merged in oil bath for smooth operation. Figure 12.1(b) shows a warp knitted structure.

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