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> Basic Asaflex™ molding conditions |
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December 12, 2001
Asaflex™ can be used in any of the molding processes generally employed for thermoplastic polymers. |
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Basic
Asaflex™ molding conditions
Molding temperatures of 250°C or higher will cause
rapid crosslinking among the rubber (polybutadiene) constituents
of the Asaflex™ polymer, resulting in loss of transparency
and degradation of other properties. In operations with
molding temperature near 230°C, long residence times
may also lead to degraded characteristics, and particular
care is necessary to avoid product defects.
Asaflex™ molding temperatures — optimal
and practicable ranges for various molding processes
Illustrative examples of Asaflex™ molding
conditions
These examples provide a basic reference,
but the conditions appropriate to a specific operation
will depend on the Asaflex™ grade, co-constituents,
process equipment and dies, product form and size, and
other essential factors, and should be determined and
confirmed in preliminary trials.
Illustration 1 — Asaflex™ injection
molding
| Molding |
Flat
plate, 130 x 110 x 3 mm |
| Gate |
Tab gate, 3 x 3 mm |
| molding
machine |
5 oz, 80 ton clamp force |
| Cylinder
temp. |
180–200°C |
| Nozzle
temp. |
200°C |
| Injection
pressure |
680 kgf/cm2 |
| Mold
temp. |
50°C |
| Back
pressure |
60 kgf/cm2 |
| Cushion |
3–5 mm |
| Injection
time |
10 sec |
| Cooling
time |
20 sec |
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Illustration 2 — Asaflex™ T-die sheet extrusion
| Molding |
Sheet,
0.8 mm thick x 700 mm long |
| Extruder |
90 mm diameter |
| Screw |
Full-flight
screw, L/D = 28 |
| Die |
Coat hanger
type |
| Cylinder
temp. |
C1 |
170°C |
| C2 |
180°C |
| C3 |
185°C |
| C4 |
190°C |
| C5 |
200°C |
| Die
temperature (D1–D5) |
200°C |
| Polishing
roller temperature |
60–80°C |
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Illustration 3 — Blow molding
| Molding |
Sheet,
0.8 mm thick x 700 mm long |
| Extruder |
50 mm diameter |
| Die
head No. |
2 |
| Mold |
2-cavity |
| Cylinder
temp. |
C1 |
150°C |
| C2 |
160°C |
| C3 |
175°C |
| Adaptor
temperature |
175°C |
| Die
temperature |
170°C |
| Screw
speed |
60 rpm |
| Extrusion
output |
30 kg/hr |
| Molding
cooling |
Water-cooled |
| Blow
pressure |
6 kgf/cm2 |
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- Please note that all data and values
are given as typical results obtained with the indicated
test methods,
and not as any product specification or warranty of any
nature.
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