why twist? twisted yarns in technical textiles. —

Saurer Technologies GmbH & Co. KG Twisting Solutions Leonhardstrasse 19, 87437 Kempten, Germany T +49 831 688 0, F +49 831 688 321 [email protected], www.saurer.com Subject to alterations © Twisting Solutions 11-2017 WHY TWIST? TWISTED YARNS IN TECHNICAL TEXTILES. — TWISTING OF MAN-MADE FIBRES. Manmade fibres, in particular those that are required for technical applications represent a fast-growing market. Some of the manmade fibres are twisted before further processing. But why? Twisting is carried out mainly for two reasons: Firstly, the monofilaments arranged parallel to one another must be held together, i.e. reinforced – this is the case with a protection twist or sewing thread and secondly, to create specific properties in the finished yarn (e.g. tire cord). Trouble-free further processing thanks to closed surface Let us first take a look at the protection twist: Manmade fibres pro- duced by the spinning machine are made up of numerous monofilaments arranged parallel to one another. The measurement „1670 dtex f 384“ tells us, for example, that the yarn comprises 384 monofilaments. These monofilaments must be held together by ap- plying a protection twist. The task of the protection twist is to enable the further processing of the yarn, e.g. in weaving. The protection twist ideally integrates the monofilaments evenly into the fibre strand. There is no decrease in tensile strength as is the case with twisting, on the contrary, the maximum tensile strength actually increases. A more typical application for a protection twist are warp yarns which are used for manufacturing facing fabric, e.g. for tarpaulins, roofs or tents. Manmade fibres which are used for manufacturing belts, ropes or nets also require a protection twist before they can be further processed. Twisting is also indispensable in the production of turf and enables the further processing of the yarn through the tufting machine. On completion of the tufting process, the threads are cut and the turns of twist in the finished product, i.e. artificial turf just “disappear” again. In order to hold the monofilaments together, only relatively few turns of twist are required. Depending on the fineness, the yarns are turned between 40 and 120 times per metre. High delivery speeds are therefore a prerequisite for ensuring economic twisting. The two-for-one twisting machine TechnoCorder TC2 is virtually predes- tined for this application, i.e. for producing a protection twist. Thanks to a new drive concept for delivery, traverse motion and winding, delivery speeds of up to 450 metre per minute are achieved with the TechnoCorder TC2

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Page 1: Why tWist? TWISTED YARNS IN TECHNICAL TEXTILES. —

Saurer Technologies GmbH & Co. KG Twisting SolutionsLeonhardstrasse 19, 87437 Kempten, GermanyT +49 831 688 0, F +49 831 688 [email protected], www.saurer.com

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WHY TWIST?TWISTED YARNS IN TECHNICAL TEXTILES.—TWISTING OF MAN-MADE FIBRES.

Manmade fibres, in particular those that are required for technical applications represent a fast-growing market. Some of the manmade fibres are twisted before further processing. But why?

Twisting is carried out mainly for two reasons: Firstly, the monofila-ments arranged parallel to one another must be held together, i.e. reinforced – this is the case with a protection twist or sewing thread and secondly, to create specific properties in the finished yarn (e.g. tire cord).

Trouble-free further processing thanks to closed surfaceLet us first take a look at the protection twist: Manmade fibres pro-duced by the spinning machine are made up of numerous monofila-ments arranged parallel to one another. The measurement „1670 dtex f 384“ tells us, for example, that the yarn comprises 384 monofilaments. These monofilaments must be held together by ap-plying a protection twist. The task of the protection twist is to enable the further processing of the yarn, e.g. in weaving.

The protection twist ideally integrates the monofilaments evenly into the fibre strand. There is no decrease in tensile strength as is the case with twisting, on the contrary, the maximum tensile strength actually increases.

A more typical application for a protection twist are warp yarns which are used for manufacturing facing fabric, e.g. for tarpaulins, roofs or tents. Manmade fibres which are used for manufacturing belts, ropes or nets also require a protection twist before they can be further processed.

Twisting is also indispensable in the production of turf and enables the further processing of the yarn through the tufting machine. On completion of the tufting process, the threads are cut and the turns of twist in the finished product, i.e. artificial turf just “disappear” again.

In order to hold the monofilaments together, only relatively few turns of twist are required. Depending on the fineness, the yarns are turned between 40 and 120 times per metre. High delivery speeds are therefore a prerequisite for ensuring economic twisting. The two-for-one twisting machine TechnoCorder TC2 is virtually predes-tined for this application, i.e. for producing a protection twist. Thanks to a new drive concept for delivery, traverse motion and winding, delivery speeds of up to 450 metre per minute are achieved with the TechnoCorder TC2

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