Textile Craft: Knitting

Argar Technology develops new range of protective knitted fabrics

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Italy's Argar Technology, which specialises in research and development of protective knitted fabrics, has developed Tes-firESD-HV, a new range of protective knitted fabrics featuring intrinsic flame retardant, antistatic, arc flash protection functional specification, now with the addition of High Visibility property.</div><br>
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Tes-firESD-HV Knitted Fabrics are designed to offer a great protection performance. Argar Technology where necessary, either in case of intrinsic risks originated by work environment or for protection against particularly uncomfortable climatic and environmental conditions, with addition of High Visibility function.</div><br>
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In the new HVis-Tes® range of items, the external face of fabric is 100%Polyester, while the internal face is 100% pure Cotton. In this peculiar interlacing the extraordinary features of durability and endurance of a Polyester fabric join the Comfort that only a Cotton fabric is able to provide in touch with the skin.</div><br>
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The company has also joined the voluntary system TF-Traceability & Fashion, obtaining the Certificate of Conformity for its protective knitted fabrics for technical and safety workwear, in the several production lines and certifications.</div><br>
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This system was developed by the Italian Chambers of Commerce in cooperation with Centro Tessile e Cotoniero in Busto Arsizio which enables the final customer to verify where the raw materials come from and to check the transparency of the whole production chain.</div><br>
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The system allows consumers to choose and purchase a product safely, knowing exactly how it has been made, from the origin of raw materials to the localization of the production steps.</div><br>
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The antistatic, FR, and arc flash protection with High Visibility features of Tes-firESD-HV Knitted Fabrics fully comply with the specifications of EN1149, EN11612, EN61482, EN20471 and Oeko-Tex Standard 100 Class II Certifications rules.</div><br>
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Argar Technology develops new range of protective knitted fabrics

Italy's Argar Technology, which specialises in research and development of protective knitted fabrics, has developed Tes-firESD-HV, a...

New weft insertion machine for wind turbine market by Karl Mayer

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Karl Mayer Malimo, the leading textile machinery manufacturer that specialises in technical textiles, has combined the key components of its RS MSUS-V machine with biaxial technology and developed a biaxial machine featuring weft insertion in line with the knitted courses to suit the market.</div><br>
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This new innovation is known as the Biaxtronic CO and compared to the conventional version, this new composite machine is said to offer an improved cost:benefit ratio and advantages in terms of its operation and maintenance.</div><br>
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The products made on this machine are also said to provide a different type of quality, making them suitable for the Chinese wind turbine market – Chinese manufacturers of multiaxial structures for the blades of wind turbines require a construction containing weft yarns that are not pierced during the knitting process.</div><br>
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As with all stitch-bonded biaxial textiles, the fabrics produced on the Biaxtronic CO are made up of zero inlays and weft yarns and, if required, an additional base web, such as a chopped glass strand mat or a nonwoven.</div><br>
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The two reinforcing yarn systems are inserted absolutely straight and parallel at angles of 0 and 90º and fixed in place by stitches. This is said to avoid variations caused by the construction, which lead to loss of strength and undesirable stretching with woven fabrics.</div><br>
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The weft yarns are not pierced or damaged. This enables higher strength levels to be achieved when using conventional materials. As well as that, new yarn combinations can be used for the same strength values, the company reports.</div><br>
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The Biaxtronic CO is available in working widths of 100", 101" and 102". The gauges available as standard are E 5, E 6, E 7 and E 10. The standard features also include the KAMCOS system, an N-drive with a maximum of three pattern discs, an operating interface with 12.1" touchscreen monitor, and a warp beam frame with one or two warp beam positions.</div><br>
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An electronically controlled yarn let-off drive is available for each mounted warp beam. The maximum flange diameter of the sectional warp beams is 32". The zero inlays are delivered via electrically driven delivery rollers from creels. The tried-and-tested MSUS system is responsible for weft insertion.</div><br>
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The knitting elements are also similar to those of a weft-insertion warp knitting machine, and include a compound needle and closing wire bar, knock-over sinker bar, zero inlay bar, counter retaining bar with support rail, and one or two ground guide bars for stitch formation. Every yarn is tied-in in a stitch at the knitting point to bond the structure of the textile.</div><br>
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The Biaxtronic CO combines the latest materials with complex design solutions, especially in terms of the drive technology and the weft insertion system. These optimised features enable this high-performance machine to reach speeds of up to 1,400 min-1 and to achieve maximum production rates of 6.5 m/min, the manufacturer reports.</div><br>
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The weft laying frequencies are also extremely high. The Biaxtronic CO produces top-quality products. In particular, the continuous transport belt for feeding the chopped glass strands under the yarn layers produces textiles with no faults. This system guarantees that the chopped glass strand mat and the weft layer are kept separate at all times.</div><br>
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New weft insertion machine for wind turbine market by Karl Mayer

Karl Mayer Malimo, the leading textile machinery manufacturer that specialises in technical textiles, has combined the key components of ...

Loop transfer in weft knitting (V-bed)

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The transfer of a full or part of a needle loop or sinker loop on to an adjacent needle, either in the same bed or in an opposing bed is called stitch or loop transfer. The stitch formed by this loop transfer is called loop transfer stitches.</div><br>
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Objects of loop transfer:</b></h3>
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<li>To achieve shaping, produce a design or change the loop structure.</li>
<li>To generate holes in the fabric to form lace-like effects.</li>
<li>To produce structural effects by inclining wales of both plain and rib fabrics.</li>
<li>To produce cables by exchanging two or more group of wales with one another.</li>
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<h3><b>Shape formation (fashioning):</b></h3>
<div>Shaping by fully fashioning involves the movement of a small number of loops at the selvedge of the fabric. Such movement reduces or increases the total number of loops being knitted. The term used in the industry for such movements are narrowing and widening, and collectively fashioning.
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<h4><b>The Widening:</b></h4>
<div>Widening is the process of increasing the width of the knitted fabric produced, by increasing the numbers of working needles.</div><br>
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<h4><b>The Narrowing:</b></h4>
<div>This is reverse of what takes place in widening i.e. Narrowing is the process of lessening the width of knitted fabric produced, by decreasing the number of working knitting needles.</div><br>
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Loop transfer in weft knitting (V-bed)

The transfer of a full or part of a needle loop or sinker loop on to an adjacent needle, either in the same bed or in an opposing bed is ...

Barre in Fabrics | Fabric Fault

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<div>In textile industry, one of the most common and perplexing quality control problems is barre (repetitive yarn direction streaks). The factors which can cause or contribute to barre are varied and diverse. 
Barre is defined as "unintentional, repetitive visual pattern of continuous bars or stripes usually parallel to the filling of woven fabric or to the courses of circular knit fabric."</div>
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<h2><b>Causes of Barre</b></h2>
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<h3><b>Fibre properties:</b></h3>
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<li>Fibre Micronaire variation</li>
<li>Fibre color variation</li>
<li>Improper mixing of cotton from different origin</li>
<li>Improper mixing of cotton from different varieties</li>
<li>Improper mixing of cotton grown in different seasons</li>
</ul>
<h3><b>Yarn properties:</b></h3>
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<li>Yarn linear density variation</li>
<li>Yarn twist variation</li>
<li>Yarn hairiness variation</li>
<li>Yarn package lot mixing</li>
<li>Hard or soft winding of yarn package</li>
</ul>
<h3><b>knitting:</b></h3>
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<li>Tight loops: This may take the form of a shaddow ( several courses involved) or a discreet line ( one course involved). It will normally show up as a dark or dense line or shaddow</li>
<li>Slack loop: Similar to above, but it shows up as a sheer or light line.</li>
<li>Improper stich length at a feed</li>
<li>Improper tension at a feed</li>
<li>Variation in fabric take-up from loose to tight</li>
<li>Worn needles, which generaly produce length direction streaks</li>
<li>Uneven cylinder height needles(wavy barre)</li>
</ul>
<h3><b>Weaving:</b></h3>
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<li>Uneven warping tension</li>
<li>Uneven take-up tension</li>
<li>Uneven let-off motion</li>
<li>Uneven tension on filling</li>
<li>Scuffing or filling yarn on the beam</li>
<li>Bent beam gudgeons</li>
</ul>
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Barre in Fabrics | Fabric Fault

In textile industry, one of the most common and perplexing quality control problems is barre (repetitive yarn direction streaks). The fact...

Textile Craft

Argar Technology develops new range of protective knitted fabrics

New weft insertion machine for wind turbine market by Karl Mayer

Loop transfer in weft knitting (V-bed)

Barre in Fabrics | Fabric Fault

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