The stitching wire is designed for stitching printing, white and cardboard products, as well as wooden boxes for fruits and vegetables.
The wire is made of low carbon wire rod.
The surface of the wire should not have any cracks or rust. The coating on the wire should be continuous, without gaps and cracks, visible without the use of magnifying devices.
Local influx of copper is allowed, increasing the actual diameter of the wire by an amount not exceeding the positive limit deviation.
The adhesion of the copper coating to the steel base must be strong. The coating should not crack and peel off during spiral winding of the wire with six tight turns on a cylindrical mandrel with a diameter equal to four times the diameter of the winded wire.
The stitching wire is supplied on wire spools of 15 and 350 kg, wound in dense non-tangled rows and wound freely, while the wire should not be folded.
Each coil of wire for stitching is packed in a film and a cardboard box on which a label is attached, which indicates:
a) the trademark or name and trademark of the manufacturer;
b) the symbol of the wire for stitching;