extruder barrel, melt flow direction, converging die entrance, clamping ring, die opening length, extrudate profile
screen pack, breaker plate, die, die opening size, polymer plate, extrusion die
die cross section
square extruded profile
screen pack, breaker plate, section B, mandrel, air channel, spider legs
extruder barrel, melt flow direction, polymer melt, A, spider leg, A, section A, air in
cylinder for screw- ram, heaters, reciprocating screw, stationary patern, movable patern, clamping cylinder, hydraulic cylinder, motor and gears for screw rotation, injection unit
Alumina and silicon are traditional ceramics used in what type of industrial applications?
pottery, tableware, brick and tile, refractories, abrasives
pottery, tableware, brick and tile, refractories, abrasives
Alumina and silicon are traditional ceramics used in what type of industrial applications?
main component in glass
silica
silica
main component in glass
What is glazing
involves application of a surface coating, usually a mixture of oxides such as silica and alumina, make product less previous to moisture and less atractive to eye
involves application of a surface coating, usually a mixture of oxides such as silica and alumina, make product less previous to moisture and less atractive to eye
glazing
What is the term polymer derived from? What is its meaning?
poly meaning many
three categories of polymers
Thermosets, thermoplastic, elastomer,
True or False Thermosets are the most
important category of Polymers.
False
How does the degree of polymerization affect the properties of a polymer?
Higher dp increases mechanical stregth but increases viscosity in the fluid statte, which makes processing more difficult.
Name
the two methods by which the synthesis of polymers occurs.
addition and step polymerization
In
which of the three categories of Polymers is crosslinking involved?
thermosetting and elastomers
True or False As crystallinity
increases density increases.
true
A____________ is a compound consisting of a long chain of molecules.
linear polymers
linear polymers
A____________ is a compound consisting of a long chain of molecules.
Name the four types of structures of polymer molecules.
linear, branched, cross linked, network structure
linear, branched, cross linked, network structure
Name the four types of structures of polymer molecules.
Polymers whose molecules are made up of two repeating units of two different types are?
copolymers
copolymers
Polymers whose molecules are made up of two repeating units of two different types are?
What is the largest market for natural rubber?
automotive tires
automotive tires
What is the largest market for natural rubber?
True or False
The strength to weight ratio for polymers is not good.
false
Define
Viscosity.
a fluid property that relates the shear stress experienced during flow of the fluid to the rate of shear.
a fluid property that relates the shear stress experienced during flow of the fluid to the rate of shear.
Viscosity
Name the three sections of an (single-screw) extruder.
