Extrusion International 3-2016

Extrusion International 3/2016

www.tecnomaticsrl.net

he project is expected to have considerable environmental

and social impacts. The climatic context (drought and de-

sertification), the degradation of natural resources as well as

poverty, particularly among the least privileged segments of

the population, have increased the pressure on and demand

for water facilities and the need for integrated resource ma-

nagement planning to cope with climate change. The UN De-

velopment Programme (UNDP) estimates that total budgetary

spending in the water and sanitation sectors in sub-Saharan

Africa is currently around $800 mn a year. This amount could

likely be increased to $2.5 bn through “cost recovery”.

The manufacturing of pipes will help to support the develop-

ment and major infrastructure works under way in the coun-

try. The customer, representing an important group of

companies in the construction and trading business, even if

has started its pipe production recently, has rapidly gained re-

putation because of its choices quality oriented.

Technical details of the line

The lines, characterized by reliable technological solutions –

such as the extruders Vega with L/D ratio of 37 and Venus

heads with internal pipe cooling (PAC) – will produce HDPE

pipes with diameters up to 400 mm.

The VEGA series are the result of years of experience manu-

facturing extruders and of a constant effort to develop each

part of them. A constantly updated screw design, matched

with the water cooled straight feed bush, ensure excellent pro-

duction values with optimal plasticizing, even at high output

rate. The specific output has been further increased and it

maintains constant across the whole screw speed range or

even at high backpressures values.

The machines are equipped with synchronous AC motors spe-

cifically designed to be used in applications at high dynamic

performances with variable speeds. The selected motors are

mechanical sturdy to withstand high overloads while a highly

effective insulation avoid a gradual deterioration caused by

operation at high frequencies. Italian gearboxes characterised

by single block cast iron frame, for large oil capacity cooled by

an independent unit, and high performance bearing unit (up

to 500 bars) fit out the transmission system of the VEGA se-

ries. To process the high throughput with low backpressure

and stress load to the material VENUS die-heads are the pro-

per tools. Based on a spiral distributor concept with a com-

pact design thanks to their innovative geometries and the

internal air cooling (PAC system) ensure an optimal wall thick-

ness distribution, ovality and low sagging. The lines are syn-

chronized using gravimetrics on each extruder, to guarantee a

continuous raw material feed and to record variations in mass

throughput, thereby ensuring a perfect control of the weight

per meter and wall thickness distribution. The downstream

equipment includes Tecnomatic vacuum & cooling tanks, haul-

offs with caterpillar tracks controlled by an independent vector

AC motor and planetary saws with knife cutting and universal

clamping device, for a very accurate swarf-less pipe delivery.

VEGA extruder 75.37 with VENUS 400 and PAC air cooling system, for efficient pipe production