Fundamentals of Extrusion - GOMCFundamentals of Extrusion Extruding technology was developed in the...
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The Manufacturing Confectioner • January 2008 71 ➤ T he working method of an extruder is based on the principle of the Archimedes screw technology and was already being used in the 17th century. In the beginning of the 20th century, extrud- ers as production machines were used for manufacturing plastics and other nonfood materials. An extruder is a machine which converts viscous masses to solid masses by mechan- ical pressure and/or with thermal treatment. It presses the mass uniformly through a geo- metrically shaped nozzle and forms it into slabs, strands or individual pieces. The pressure in an extruder varies depending on the construction. Designs from 1 to 300 bars (14 to 4,200 psi) and, for special applications, even 700 bars (9,800 psi) can be achieved. Normal working tem- peratures are between -18°C and 300°C (0°F and 572°F). Extruders are classified into two techno- logical types: reactive extruders and process extruders (Figure 1). REACTIVE EXTRUDERS In the reactive extruder materials are chem- ically or physically modified and formed. Fundamentals of Extrusion Extruding technology was developed in the 17th century. It has evolved into a variety of sophisticated machines that serve the confectionery industry. Hermann-Otto Vongeheur Hosokawa Bepex Hermann-Otto Vongeheur is cur- rently group director of process technology and R&D at Hosokawa-Bepex. He has held machinery and process technol- ogy jobs at Winkler + Dünnebier, Jagenberg and Ziemann. Figure 1 Process and Reactive Extruders Process Extruders Mechnical pressure leads to geometrical formed products Reactive Extruders Thermal energy and pressure lead to a physically or chemically charged structure
Transcript of Fundamentals of Extrusion - GOMCFundamentals of Extrusion Extruding technology was developed in the...
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The Manufacturing Confectioner • January 2008 71
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The working method of an extruder isbased on the principle of theArchimedes screw technology and was
already being used in the 17th century. In
the beginning of the 20th century, extrud-
ers as production machines were used for
manufacturing plastics and other nonfood
materials.
An extruder is a machine which converts
viscous masses to solid masses by mechan-
ical pressure and/or with thermal treatment.
It presses the mass uniformly through a geo-
metrically shaped nozzle and forms it into
slabs, strands or individual pieces.
The pressure in an extruder varies
depending on the construction. Designs
from 1 to 300 bars (14 to 4,200 psi) and, for
special applications, even 700 bars (9,800
psi) can be achieved. Normal working tem-
peratures are between -18°C and 300°C (0°F
and 572°F).
Extruders are classified into two techno-
logical types: reactive extruders and process
extruders (Figure 1).
REACTIVE EXTRUDERS
In the reactive extruder materials are chem-
ically or physically modified and formed.
Fundamentals of ExtrusionExtruding technology was developed in the 17th century. It hasevolved into a variety of sophisticated machines that serve theconfectionery industry.
Hermann-Otto VongeheurHosokawa Bepex
Hermann-OttoVongeheur is cur-rently group directorof process technologyand R&D atHosokawa-Bepex. Hehas held machineryand process technol-ogy jobs at Winkler +Dünnebier, Jagenbergand Ziemann.
Figure 1
Process and Reactive Extruders
Process ExtrudersMechnical pressure
leads to geometrical formed products
Reactive ExtrudersThermal energy and pressure
lead to a physically or chemicallycharged structure
