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| Attention must be paid before,
during and after the molding of Soarnol®
due to the physical and chemical properties and molecular
structure of Soarnol®. |
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| (1) |
Pre-Purge |
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In case of change-over from LDPE to Soarnol®,
you can use Soarnol® directly.
On the other hand, in case of change-over from HDPE , PP or
L-LDPE
to Soarnol®,
it's preferable to have change-over with LDPE firstly, and
you can use Soarnol® after that.
Especially, when you use Nylon or PVC before processing of
Soarnol ,
you can have change-over with Soarnol® if the residual
resins inside a cylinder or a die are removed perfectly
by purging these resins with LDPE. |
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| (2) |
Resin Temperature |
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Please pay attention to set temperature of cylinder head
or die and to screw speed. |
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| (3) |
Residence Time |
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Approximately 30 minutes are allowable for residence time.
In the case of extended down time, it's
recommended to idle the extruder at a low screw speed,
or to change over to LDPE. |
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| (4) |
After-Purge |
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After-purging with LDPE(MFR=nealy 1) is effective even within
a short time period. |
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| (5) |
Attention to purging
resin |
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PP or HDPE are not good pre-purging or after-purging
resins.
Either of these resins causes gel problems after contacting
EVOH.
Purging with adhesive resin may also cause gel problems. |
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| (6) |
General conditions
of purging are shown in the following. |
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Real Condition of Pre-Purge or after-Purge
with "Soarnol®" |
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Resin before change  |
Change-over resin |
Resin after change |
| LDPE, HDPE, PP |
LDPE (MI = 5-8) |
Soarnol® |
| HDPE and PP (Lower MFI) |
LDPE (MI=less than 2)
LDPE (MI=5-8) |
Soarnol® |
| Soarnol® |
LDPE (MI = 0.5 - 2) |
LDPE, HDPE and PP |
| Polyamide |
LDPE (MI = 0.5 - 2)1) |
Soarnol® |
| Soarnol® |
LDPE (MI = 0.5 - 2)2) |
Polyamide |
| Adhesive resin 3) |
LDPE (MI = 0.5 - 2) |
Soarnol® |
| Soarnol® |
LDPE (MI = 0.5 - 2) |
Adhesive resin3) |
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| 1) |
With temperature down from polyamide extrusion
temperature
to less than 230deg C. |
| 2) |
After enough purge of Soarnol® with
LDPE at 200 - 230 deg C, temperature should be rised
to polyamide
extrusion temperature. |
| 3) |
Polyolefine base adhesive resin. |
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| Notes: |
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No purging is necessary for changing
from one Soarnol® quality to another. |
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Soarnol® extrusion
processing should be shut down after enough after-purging
of "Soarnol®" by
LDPE (MI=0.5-2). |
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Data Prepared : 18 Sep. 2003 |
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