Stitch hole

Deleterious effects are introduced during the stitching process, which include the breakage and misalignment of the in-plane reinforcing fibers and the formation of resin rich regions at the stitch holes. 

A welded seam is formed where two pieces of material are fused together by heat and pressure alone, creating an adequate bond on thermoplastic coatings such as polyvinylchloride, polyurethane, polyethylene and polypropylene. Welded seams are also being used increasingly for women s bras and babies pants and nappies, as they are comfortable. The finished seams mb the skin less, as they are flatter and lighter than the conventional seams. Chemical protective clothing is another area where welded seams provide improved penetration resistance, as there are no stitch holes for the chemicals to penetrate. 

Stitching holes, which may otherwise also lead to dust emission. Although there has been a steady growth in the use of PTFE membranes since their introduction in the 1970s, their relatively high cost remains a deterrent to general use, and so the tendency is to use them where filtration conditions are particularly difficult e.g. where strict emission controls are in force or where very fine, sticky or toxic dusts are encountered. 

The characterization of the fiber disturbance in the area of a needle hole can be performed based on the analysis of the various stitched preforms and FRPC laminates. To find out the criticai elements in the stitching process (independent of seam, materiai layers, and the direction of stitch formation), the seam analysis is a must. The needle penetration causes the spreading of the fibrous package. This effect is dominated by the needle size. In the subsequent cycle of stitch formation, the penetrated needle comes out of the material and forms a stitch hole. Figure 9 describes the influence of a needle system on the intensity of formation of stitch holes at the dry preform stage. The interlacing is put on the upper side of... 

Throat plate Has a stitch hole for the needle and the thread as well as a cutting for... 

Stich, m. prick, puncture, stab, sting stitch engraving shooting pain thrust, pass (of colors) cast, tinge (Metal.) tapping, tapped metal, tap hole, shrink hole. — im Stiche lassen, leave in the lurch. 

The stitch knots and holes act as stress concentration sites in the laminate microstructure. 

Potanova, M.A., Poc, C.C., Whitecomb, J.D. (1992). Open hole and post-impact compressive fatigue of stitched and unstitched carbon fiber-epoxy matrix composites. In Composite Materials Testing and Design (lOlh Volume), ASTM STP-1120 (G.C. Grimes ed.), ASTM, Philadelphia, PA, pp. 37-53. 

Penetration encompasses movement through openings between fibers and yams, stitching, seams, closures, or flaws by mechanisms such as wicking, wetting, pressure gradients, bulk flow, and so forth. For penetration to occur there must be a hole. 

Throat plates are designed to support the material being stitched and to allow easy passage of the material over its surface. The throat plate is manufactured with a needle hole to allow the needle to penetrate the fabric. 

In cast resin molds, vacuum holes can be provided by including greased wires in the casting for later removal. For greater detail such as graining, stitching, and relief work, cast porous aluminum molds should be considered (also used in blow molding molds). 

Stitch up these holes in your corporate pockets and... 

While these studies have shown that polyaniline- and polypyrrole-coated fabrics can behave as chemi-resistive sensors, it is also expected that similar chemi-resistive behavior will be achieved using ICP monofilaments and yams, which are woven or stitched into an existing fabric. Ultimately, vapor detection fabric will need to comprise of an array of sensors with the patterned response fed into a microprocessor in order to identify and determine the concentration of the vapor. The relatively low cost of production and subsequent processing of these electrically conductive fabrics provide the opportunity for designing a textile-based electronic nose, which possess built-in massive redundancy for the sensor array so that device will still function even if there is a localized break (rip, tear hole, etc.) in the fabric network. Specifically, in case some area of the sensor system fads, there is a massive redundancy in the garment such that other areas may stdl be able to acquire the information. This will greatly increase the rehabdity of the system. 

Eyelet l-bt [alter, of ME oilet, fr. MF oillet, dim. of oil eye, fr. L oculus] (14c) n. (1) A series of small holes made to receive a string or tape. A buttonhole stitch is worked around the holes. (2) A type of yarn guide used on a creel. (3) A fabric style with areas of cut-outs surrounded by stitching. Complete textile glossary. Cela-nese Corporation, New York. 

The traditional surgical repair method for ASD is a full sternotomy (open heart surgery), where the hole is either stitched closed or sealed using a synthetic patch or the patient s own pericardium, which forms the fluid-filled sac surrounding the heart. Typically, the synthetic patches are made of either polyester (polyethylene terephthalate) (Dacron ) or expanded poly-tetrafluoroethylene (ePTFE) (Goretex ) fabric. TTiis method is still used in severe cases of ASD. °... 

As far as knitted fabrics are concerned, the main defects are dye spot, slub, stain ladder, spirahty, ends outs, dragging ends, mixed yarns, missing yams, holes, compactor creases, missing plush loops, skipped stitches, colour differences, slub, stain, pin marks (Anagnostopoulos et al., 2001), etc. Some of the knitted fabric defects are shown in Figure 5.5. 

X-feed from Typical Corporation is characterised by needle feed and alternating drop feed. The feed dog is split into two independent feed dogs the central one has a needle hole and acts like a needle feed, and the side one acts like a drop feed. During the first half of stitch length, the needle enters the material and also through the hole of the... 

As the synchroniser can monitor the rotation of the hand wheel, it can also count the number of rotations of the hand wheel. One complete rotation of the hand wheel equates to one stitch formation. To ensure that thread is not slipped out of the needle hole while starting the next sewing cycle, all generations of computerised machines have one thread catcher and thread wiper fitted near the needle point. While the thread wiper swipes away the thread tail towards the right side of the stitch line, the thread catcher holds the thread end by suction or pinch force to ensure that the thread is not shpped out of the needle hole while starting the next sewing cycle. 

During inspection, some parts of a product are more important than others in terms of allowable defects. Each company defines its own product zones and includes these in their specifications as there is no industry standard. The highest priority zone (could be identified as Zone 1, Zone A, or Zone 1) is usually identified as the area that will most likely been seen during a face-to-face conversation, whereas the inside of a garment is not as critical in terms of acceptable defects. Companies will also define what they deem as critical, major, and minor defects. A critical defect results in a flaw that produces an unsafe or hazardous situation like a hole in a latex glove that would compromise the safety of the wearer. A major defect is a flaw that often contributes to product failure or lack of usability for a product. Examples of a major defect could be a broken zipper, broken stitches, or tears in the fabric. A minor defect is a flaw that does not reduce the usability of a product, but still deviates from standards... 

Make a blotter from two 25 X 25-cm squares of Whatman 3MM paper by stitching them together with a zigzag stitch around the edges and then cutting two circular 1.5-cm holes with a sharp cork borer in appropriate positions for the sample and marker dye origins (Fig. 4). Blotters can be reused many times, but a separate blotter should be used for each pH. 

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