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EuroWire – May 2007

117

Sirio Wire is an Italian company

that supplies equipment for the

chemical

and

electrochemical

treatment of wire, including

ultrasonic and electrolytic cleaning,

chemical

and

electrochemical

pickling, coating, and electro-

deposition.

The

company’s

bronzing lines for the production

of tyre bead wire combines many

of these elements.

The bead wire is a bronze coated

wire used for the reinforcement of

all types of tyre. A bronzing line can

be divided into three main sections:

a stress relieving lead bath, a

cleaning and pickling section,

and a bronzing section. The lines

operate at very high speed (up

to 500m/min) with wire diameter

between 0.8mm and 1.8mm.

As the speed of the wire is very high in this

type of line, special care has to be taken

for all rising and air wiping steps, and Sirio

Wire has designed an efficient solution to

reduce the liquid drag out from one bath

to another.

The line consists of a set of polypropylene

or stainless steel working basins, and

a set of tanks made of polypropylene

welded plates.

Collecting pipes feed the working basins,

and the bath is pumped from the storage

tank located below, by vertical pumps.

The alignment of all working basins

allows straight line guiding of the

wire, without any deviation. It is

essential for the wire entering the

bronze plating line to be perfectly

clean, and it is therefore necessary

to remove all residuals of soap

and oxide present on the wire.

Sirio Wire recommends the use

of a combined system, first using

electrolytic cleaning in an alkaline

bath to remove any soap present

on the wire, then an electrolytic

pickling bath to remove oxide and

activate the surface of the wire for

the deposition.

The wire is bronze coated by

chemical displacement in an acid

bath (containing copper sulphate,

tin sulphate and sulphuric acid)

at a controlled temperature. A good

agitation is obtained in the bath in order

to improve the coating process.

SirioWire Srl – Italy

Fax

: +39 0362 576 138

Email

:

info@siriowire.it

Website

:

www.siriowire.it

l

Bronzing line for tyre bead wire

equipment for wire treatment

General view of a bronzing line