2.While stitching what is the maximum temp.which the needle achieves?With CoolersMaxm – 176c (at 4000 stitches per min)Without CoolersMaxm – 273c(at 4000 stitches per minute)3.How many times the thread passes through the needle thread before it get stitched?Twice.5. WHAT ARE THE CONVENTIONAL NEEDLE POINTS MANUFACTURED BY THE NEEDLEMANUFACTURING COMPANIES? GIVE THE LIST OF THE NEEDLE TYPES MANUFACTURED BYGROZ & BECKERT.Needle PointsNeedles are manufactured with a wide variety of needle points appropriate for the differentproperties of materials which have to be sewn. The needle point can be located wither centrallyor eccentrically. There are two basic classes of points: Round points Cutting pointsSlim Set Point Needles – can be penetrate the yarns of the material being sewn through its sharppoint and is ideal for all woven fabrics because it helps to produce an even stitch and causes aminimum of fabric puckering. They are used for Blind stitches and for fine, densely wovenfabrics. These points are not suitable for knitted fabrics.Set Cloth Point – needles are slightly rounded to displace yarns of the material being sewnwithout damaging them. This is most commonly used point.Heavy Set Point – needles are strongly blunted. These are used for button sewing machines.Ball Points – Light Ball Point is used for sensitive fabrics such as knits, to prevent damage to theloops. This is crucial for maintaining the fabric’s elasticity. Medium ball point and heavy ball
point are used for fabrics containing stretchable yarns. While sewing the threads are displacednot pierced. The needle pushes between the fabric yarns rather than “cutting rough” the yards.Cutting Points – are used for sewing leather, coated or laminated fabrics. These are classifiedand named according to the position of the cutting edge and its shape. The shapes are namedwith regard to the form of the cutting edge for example spear point, triangular point, diamondpoint etc. The shape of this needle will create a slit (rather than a large hole) through which thethread will pass.Needles manufactured by Groz Beckert as per the needle point types The GB - Point Styles / Tipo De Puntas GB Description / Descripción Application/ Aplicación Designation / Symbol / denominación Simbolo Regula Universal application for LOCKSTITCH (FST 301) r and woven cloth round Aplicación universal para puntada de dos hilos y ropa R point tejidaPunta redonda normal
Sharp Standard for BLINDSTITCH. Also for very straight round stitchlines (susceptible to damage) point Tipo normal para ciega. También para lineas de RS Punta puntadas muy rectasredonda aguda Round Recommended application for CHAINSTITCH (FST point 401) knitted fabrics and button sewing with Aplicación recomendada para punto de cadeneta Tejidos RG slightl de punta y para coser botonesy rounded tipPunta ligeramente redonda Light For all kind of knitted and synthetic fabrics ball Para toda clase de tejidos y fabricados sintéticos point FFG Puntade bola fina Mediu For highly elasticated material with rubber or m ball elastomeric content point Para materiales muy elásticos con goma o contenido de FG Punta elastómeros de bolafina Heavy For coarser materials of high elasticity. Also for ball open-structured fabrics point Para materiales bastos y alta elasticidad. También para G Punta fabricados de estructura abierta de bolapesada Specia Knitted and woven fabrics with high content of l ball elastomerics (Licra, Dorlastan, etc.) point Fabricados de punto y tejidos con alto contenido de SKL Punta elastómeros (Lycra, Dorlastan, etc.) de bolaespecial para LYCRA Round For plastic foils, laminates and leather clothing point cutting edge at the tip with a Para hojas de plastico, laminados y vestidos de piel/td> small SDtriangular cutting edge attipPunta de bola pesadaNarrow Wedge (NW) point For dense stitch formation in leather. Edge andPunta de cuña estrecha cup seams on uppers P Para secuencias de puntadas densas en piel. Borde y costuras en la parte superiorNarrow Cross (NCR) point For long stitches deeply set and very straightPunta de cruz estrecha stitchlines in leather S Para puntadas largas y profundas. Lineas de puntadas muy rectas en pielDiamond (DIA) point For straight stitchlines in hard and dense leathersPunta de diamante and for bag seams DI Para lineas de puntadas muy rectas en piel dura y densa. También para costura de bolsosNarrow reverse twist For slanted stitch appearance in leathers and(NRTW/RTW) point ornamental seams LRPunta estrecha torcida al reves Para puntadas de apariencia oblicua en piel. Costuras(NRTW/RTW) (45°) ornamentalesNarrow reverse twist Application similar to LR, but slightly stronger(NRTWSP/RTWSP) cutting effectPunta estrecha torcida al reves Aplicación similar a LR, pero con el efecto cortante VRpor encima de 45° ligeramente más fuerte(NRTWSP/RTWSP)Narrow twist (NTW/TW) Stitch appearance almost straight. For regularPunta estrecha torcida joining seams in leather LL(NTW/TW) (225°) Puntada de apariencia casi recta. Para costuras de unión
regular en pielTriangular (TRI) point Stitch appearance almost straight. For hard andPunta triangular (TRI) dense leathers D Puntada de apariencia casi recta. Para pieles duras y densasReverse triangular (RTRI) For twin needle machines (left needle) to matchpoint the seam of the right needle (D) DUPunta triangular inversa (RTRI) Para máquinas de dos agujas (aguja izquierda) para aparejar la costura de la aguja derechaSquare (RSQ) point For heavy, hard and homogeneous materials. BagPunta cuadrada inversa (RSQ) seams Q Para materiales pesados, duros y homogeneos. Costura de bolsosReverse square (RSQ) point Application similar to QPPunta cuadrada inversa (RSQ) Aplicación similar a Q QRFlattened round (STAY) Application similar to Q. Also for buttonholes inpoint leather clothin STAYPunta redonda aplanada (STAY) Aplicación similar a Q. También para ojales en vestidos de piel6.How does the needle face on the puckering and what prevention measure one should take.How toimprove it?The puckering caused by the needle is called Displacement puckering.ReasonDisplacement of individual warp and/or weft threads by needle penetration and sewing thread.The extent of the displacement depends on the density of the fabric and the way it is woven, as well ason the needle thickness and thread thickness. Very fine and specially treated(easy care) fabrics permitonly very limited lateral displacement of the fabric.The risk of displacement puker arises particularly at high sewing speeds. This problem is very typicalbecause of todays finely woven microfiber fabrics. The structure of plain woven fabrics means that theseare more likely to be affected by displacement pucker than satin woven or twill woven fabrics.PreventionMaintain the correct tension of the thread.Maintain the correct tension of the bobbin case thread.Use the correct thread typeUse the correct feed dog according to stitch and fabric
How to Improve.Use the finest possible needle for a given thread size.Wherever possible two-thread chainstitch (stitch type 401) should be used. This is because this type ofstitching, with a loop of thread on the underside of the fabric causes less displacement of the warp andweft threads .7.Where do we use reinforce needle blade?These needle are designed for use in high speed sewing machines. The shoulder is often extended intothe upper part of the blade to give a thicker cross section which just enters the material when theneedle is at its lowest point on each stich. This reinforced blade strengthens the needle and alsoenlarges the hole in the material when the needle is at its lowest point , thus reducing friction betweenit and the material during withdrawl after each stich .The needle with reinforced blade and pronounced needle scarf are special designed to skip stitchingresult from wrong loop formation, needle shaking and thread breakage..8. Why we do coating?The final feature of a sewing machine needle which can vary is the surface finish which is given it.needles are made from steel and in the final stages of manufacture they are polished , especially in thearea of the eye. In many cases they are electroplated to given corrosion resistance, resistance to
mechanical were reduction of friction during sewing and a good overall appearance. The materials usedfor plating are chromium or nickel. One requirement of the surface finish of the needles is that theyshould not easily pick up any particles of synthetic fabric or synthetic sewing thred which they may havecaused to melt as a result of excessive friction-generated hear.it has been found that chromium-platedneedles resist the adherence of melted synthetic residues rather better then nickel-plated needles do,despite the fact that chromium-plated needles actually develop higher temperatures during sewing thando non-plated or nickel-plated needles.9.Short Note on needel, parts, functions, variation………Part 1Part 2
Part t 510.Where do we use tapered needle?On tapered blade needles, top of blade at shoulder is larger in thickness than at eye.blade tapersgradually to eye position, which is the diameter indicated by the needle size number. A tapered bladeserves to strenghthen the needle blade, although in doing so, nearly the entire blade length is subjectedto friction when penetrating the material.It is only made in small sizes(5 – 11).The taper permits a smaller initial perforation in fine materials yetmaintains blade strength in the curved portion of the blade.Question:11 How do we identify the size of the needle ?
Answer: The needle size can be as small as 60(.6mm) or as large as 250(2.5mm). needle size is related to the diameter at a point at the middle of the blade above the scarf or short groove but below any reinforced part. The metric system size (Nm) describes the diameter of the needle blade in hundredths of mm. Example of diameter-In mm Nm.65*100=65.90*100=901.10*100=1101.30*100=1302.50*100=250Question- 12. What care you will take while placing the order of theneedle? Answer- Sewing machine needles should be chosen according to the weight and texture ofthe fabric to be sewn.While placing the order, I will take care of these points. 1) The most readily available machine needles are sized from 9 to 18 - the smaller the number, the smaller the needle. This remains true, even if the needles we purchase use a different numbering system. 2) We should Use standard sharp sewing machine needles in sizes 11 to 14 for most sewing projects. A smaller-sized needle is best for sheer or lightweight fabrics. Sizes 16 to 18 are used for heavyweight fabrics like denim. 3) We should Use ball-point machine needles to sew knits or other stretchy fabrics. Their blunt edges allow the thread to pass between the fabrics fibers rather than through them. This is crucial for maintaining the fabrics elasticity. 4) We should Use wedge-point machine needles to sew leathers, suedes and vinyls. The shape of this needle will create a slit (rather than a large hole) through which the thread
will pass. 5) if I am unsure which is appropriate for our fabric. I will Purchase a package of assorted needle sizes. 6) I will Test the various sizes on some scrap fabric until I determine the correct size to use. 7) I will Check the label on the needle package before I make a purchase. For most brands, there will be a sizing guide that will tell us which fabrics can be sewn with the enclosed needles. 8) I will Refer to my sewing machine manual to determine which needles are compatible with my machine model. 9) I will Write down the make and model of my sewing machine and take this information with me when I purchase needles. That way Ill be able to check for needle compatibility. 10) Both ball-point and wedge-point needles are sized in the same manner as the standard variety - the higher the size number, the larger the needle. 11) We should Use sewing machine needles for most sergers and Check our serger manual, however, to make sure that a special needle is not required. 14.Write down the needle type of the following m/cNEEDLE TYPE USED FOR FOLLOWING M/C-1)single needle lockstitch-DB*1,DP*52)five thread needle flat lock m/c-4*1283)button holing m/c- 501/180 7D4)button attaching m/c- DPX5 11-14#5)Batek m/c- DPX5 11#-14#6)eyelet m/c-
7)blindstitch m/c-LW*6T8)four thread overlock m/c-DC*1,DC*279)five thread overlock m/c-10)feed of the arm m/c-TV*1,TV*511)single needle chain stitch m/c-12)edge cutter chain stitch m/c-13)double needle lockstitch m/c-DB*1,DP*514)kansai special belt attaching m/c-15) kansai special placket attaching m/c-44113G516) kansai special elastic attaching m/c-17)pocket facing attaching m/c-18)belt loop attaching m/c-15. why do we use spiral groove needles?ans. Lockstitch needles are usually made without a short groove. the function where such agroove is provided is much the same as that of long groove, that is to provide protection forthe needle-thread as it passes through the fabric.
But in case of dense or resistant materials being stitched it is sometimes advisable to use aneedle in which the grooveis longer than usual and is extended spirally downward to thepoint so that the needle-thread will not be chafed as it is drawn through the eye whilst theis still passing through the material on the upward stroke of needle.These needles arecalled as Spiral Groove Needles.16. DEVELPMENTS IN NEEDLES 1. SELF-THREADING NEEDLESHandicap or Self-Threading Needles are needles that have an ever-so-slight slit in the side ofthe needle at the eye of the needle. Sliding the thread against the side of the needle, allows thethread to slide into the eye of the needle.Self-threading needles are not available in all types of points and are only available in sizes80/12 and 90/14
2. TWIN AND TRIPLE NEEDLESTwin and triple needles are attached to a single shank by way of a crossbar. These needles areperfect for evenly spaced rows of stitching.To use these needles your machine should have zigzag capability and a throat plate that has ahole wide enough for the needle. You can NOT zigzag with the multiple needle in the machine.More than one thread spool holder is required so that each needle has its own thread source.The threads usually follow the original threading pattern, as one thread and then are threadedinto each needle. Your sewing machine manual is the best resource for operating your sewingmachine with multiple sewing machine needles.The numbers on the packages for these needles is slightly different than regular sewingmachine needles. The first number is the space or distance between the needles. The secondnumber is the needle size.Triple needles are labeled Drilling Needles 3. STRETCH NEEDLESA stretch needle is the last-resort needle when ballpoint needles still leave skipped stitches.Many people will not attempt sewing Lycra and swimwear without a stretch needle.Sizes Available: 11/75 and 90/14
Answer of Question 1,Question4,Question 13,some of Question 14. Are not there.Please don’t give these answers or share to the following students, who have not mailed theiranswers till now. Already too much time have been given to them.Plzzz follow it…Pragya DeepNitish GoswamiAnurag RanjanAmber Mani