Page 46 - November/December-2019

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SAN™ TT Made for special
challenges
Higher process reliability when knitting
technical textiles with filament yarns
Shoe uppers produced on at knitting machines
The development of tailored needles for special
applications is one of the strengths of Groz-Beckert –
one example from the flat knitting sector is the special
application needle SAN™ TT.
November/December 2019
It starts with the idea
Every innovation starts with the idea of creating
something special, something new or something
better. At this point, the implementation is still far in
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sewing fine fabrics. However, if the needle is too thin,
thread breakage or skipped stitches may occur. In
SAN™ TT 112.70-62 G01
the worst case scenario, the needle may break due
to insufficient stability.
The solution: Special application needle SAN® 10
Groz-Beckert has offered the special application
needle SAN® 10 for processing fine knitted and
the future. Existing technologies are often not the which increases the risk of cut filaments. If the yarn is woven fabrics optimally for many years now. The
specially designed geometry of this needle means it
optimal solution for a newly developed application.
damaged in this way during processing, the surface
is both gentle on the material and has sufficient
With Groz-Beckert experience and expertise, Groz-Beckert
of this and other applications with comparable
is able to create the technical requirements not only for of the product becomes hairy. The special challenges stability.
standard cases, but for special cases too. As development requirements therefore include creating a perfect loop Its slim design means that it has a smaller
structure on the one hand and the durability of the
partners, Groz-Beckert thus contribute to the
displacement cross-section in the eye area. This
implementation of your idea. knitted elements on the other. Excessive displacement of the warp threads and weft reduces the stress on the loops or the warp threads
The solution
and weft yarns when the needle is inserted into the
A field with high potential for new and further
developments, which seemed unimaginable until Our special application needle SAN™ TT 112.70-62 G yarns can also cause seam puckering. This problem fabric. This protects the material and prevents
recently, is technical textiles. New products are being 01 in gauge E 7.2 was specifically designed to also increases the greater the size of the needle. damage.
created here, new production methods, as well as optimize the production process in these
constant new challenges. In order to meet these applications. With its narrow latch head, the first Even more gentle on the
challenges successfully and to make use of the version of the new product range is ideal for material: The new SAN® 10 XS
innovation potential, manufacturer need the right tool: producing tight loops. The increased hook stability is Groz-Beckert has re-designed
One development that resulted from a specific the answer to the high tractive forces. The adapted the special application needle
application is the special application needle SAN™ spring-loaded latch function and the anti-shear effect SAN® 10 XS to enable optimal
TT. “SAN” stands for special application needle and guarantee perfect cast-off of the loop and prevent sewing of ever finer fabrics. The
“TT” stands for technical textiles. filaments from being cut during the closing action of geometry of the “thinner sister”
the latch. This solution concept can be adapted for all of the SAN® 10 needle has
The challenge the latest flat knitting machine technologies. been optimized and is now
In case of the production of shoe uppers on flat even more gentle on the
knitting machines in the field of technical textiles, tight The benefit material. In addition to its
loops with a high course density guarantee As a manufacturer, the use of the special application extremely slim design, it also
dimensional stability of the shoe. Extreme tractive needle SAN™ TT means increased productivity has a cylindrical blade, which
forces are created during the production of these through reduced needle consumption and reduced enables the needle to be
loops, however, which place high demands on the machine downtimes. The prevention of the shearing inserted gently into the
stability of the needle hook. In this application, effect, the optimized cast-off and the adapted Thread breakage, skipped stitches and needle material. This helps to prevent
breakage
multi-thread continuous filament yarns are used, spring-latch function ensure a perfect loop structure. or reduce damage even with
To prevent material damage and seam puckering, the ultra-fine or difficult to sew
needle used should be as thin as possible when fabrics.
Special application needles However, the extremely slim
SAN 10 and SAN® 10 XS geometry of the new SAN® 10
®
XS does have an impact on its
stability. This means that there
is an increased risk of the
On trend: Fine materials that frequently occurs during sewing. The most needle breaking when using
Fashion and clothing made from fine fabrics are frequent problems are the SAN® 10 XS. So it is only
currently really on trend. Whether underwear, shirts, advisable to use the SAN® 10
blouses, swimwear or sportswear – fabrics are Material damage and seam puckering XS if the top priority is
Sewing fine and ultra-fine fabrics is often extremely preventing material damage. It
becoming ever finer. For the consumer, the main difficult. As the sewing needle is inserted into the is also advisable to always
priority is comfort and functional characteristics like material, the loops or the warp threads and weft yarns keep the sewing thread as thin
breathability or high elasticity. For the manufacturer, often experience significant displacement. With fine as possible when using the
on the other hand, processing these fine materials is fabrics, this can result in loop breaks in extreme SAN® 10 XS.
a real challenge. This is due to the material damage cases, particularly when the needle used is too thick.
November/December 2019