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The manufacture
of lockseam tube is a clean, efficient and economic cost process
for the generation of tubes from coil strip stock for a variety of
industrial uses.
The process takes metal strip, flattens and then wraps in a continuous
helix around
a former where the 4 ply lockseam join is made. This join can be
manufactured automatically welded or unwelded.
The diameter of the tube is determined by altering the angle of the coil
strip feed entering the spiral. In a spiral tube the seam is a helix wrap
around the tube and because of this for any given material gauge it is
significantly stronger than
its linear counterpart.
Oval tube is formed as a secondary process to round tube in an “ovaliser”
machine. The flat oval shape has increased duct strength over rectangular
duct and with
less flat surface it provides lower air and friction loss as well as
reduced vibration.
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