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How to select the ideal drop wire?
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GTP Global Textile Partner delivers high-class drop wires according to ISO standards as well as non-standard drop wires designed for your specific needs. All drop wires are organized according to the ISO nomenclature. The table and the examples explain the ISO systems for the name of a drop wire (see table).
- Drop wires for automatic drawing-in
Most weaving mills use drop wires for modern automatic drawing-in machines as shown in the table below, according to the ISO 1150 rules. They are the most popular drop wires in the market. They can be delivered sorted alternated. These drop wires are for electrical warp stop motions only (see table). These Steel Heddle drop wires can be modified slightly to run on the older drawing-in machines like Reed Chatwood by adding keyholes. This type of drop wires is listed in the table below (see table);
- Drop wires for manual drawing-in
These GTP drop wires correspond to the ISO 441 standards for manual drawing-in. They have slanted tops and are specifically designed for electrical warp stop motions. However, on automatic drawing-in systems developed in the recent past, they can be processed without problems as well. Weaving mills something opt for this type of drop wire for automatic drawing-in because of the reduced weight (see table).
To ensure correct operation of the warp-stop motion, it is crucial to select drop wires with the correct weight. The drop wire should be heavy enough to immediately activate the stop motion when a warp end breaks, but not so heavy that excessive strain is put on the yarn. For example, a fuzzy yarn which could cling to adjacent ends may require a drop wire with more weight to properly activate the stop motion than a smooth yarn of the same yarn count. Also note that higher speeds generally require heavier drop wires.
The thickness of the used drop wires defines the number of drop wires per row. Select wires with thicknesses that will allow the wire to fall and not to crowd on the electrode. Strive for minimum of 60% of space on the rod.
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