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TPE (KOPEL-PEL) |
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Processing of KOPEL-PEL |
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1. Injection of
KOPEL
The engineering elastomer KOPEL has similar
performance as
rubber, but nearly the same processing conditions
for molding
machines as crystalline resins. Therefore, general
injection molding
machines are used in processing KOPEL. |
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<Table> Conditions of Injection
Molding for Each Hardness |
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ITEM |
UNIT |
KP3372 |
KP3363 |
KP3355 |
KP3340 |
Cylinder
Temp |
RearZone
Center Zone
Front Zone |
 |
200~210
225~235
225~240 |
200~210
220~235
220~235 |
180~192
200~220
210~220 |
160~170
170~190
180~200 |
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Nozzle Temperature |
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230~240 |
220~235 |
210~220 |
185~200 |
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Mold Temperature |
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40~60 |
40~60 |
20~40 |
20~40 |
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Molten Polymer |
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230~240 |
220~235 |
210~220 |
185~200 |
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Screw RPM |
RPM |
40~80 |
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Injection/Holding press. |
Kg/㎤ |
300~1,000 |
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Back pressure |
Sec |
50~400 |
Cycle
Tine |
Injection
Holding |
Sec |
2~6
15~40 |
2~6
15~40 |
2~8
20~50 |
2~10
20~60 |
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Injection
Molding Machine : ENGEL 75ton(3oz) |
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Product :
ASTM Specimen (Weight 41~46g) |
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2. Advice for Molding |
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1-1. Injection
speed is varied according to product form. For injection
molding of KOPEL, it is best to set a slower injection speed
compared with other crystalline resins given KOPEL's has
higher rubber elasticity.
If injection speed is too high, the molten state absorbs the
injection pressure, which may adversely affect part design
or injection conditions. For thin parts, cooling speed in
the cavity is faster than that for thicker parts.
If faster injection speed is applied to thicker parts, it
may result in defective part production due to surface
defects such as flow marks or jetting.
1-2. When a screen filter is used for mixing or
other purposes within the barrel case, it is advisable to
use screen filters of the 60~120 mesh range.
1-3. Moisture content must be maintained below
than 0.1%
Dry : 2~4 Hr-100~110
1-4. KOPEL has very low melting point compared
with other resins, and it causes poor appearance when mixed
with other resins.
In order to prevent this, all parts of the machine (feeder,
barrel and screw) must be kept clean and washed. Use of a
screen filter between the die and barrel is very effective
in screening out impurities, and it is also useful in
maintaining flow stability of polymer melt.
However, attention should be given to possible elevation of
internal pressure in the barrel.
1-5. When a master batch is used for the inputting
colorant or other specific additives, products that can be
evenly melted or dispersed under injection molding
conditions identical or similar to KOPEL should be used.
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| Chemical |
Effect |
Chemical |
Effect |
Acetic
Acid
Acetone
Acetylene
Aniline
ASTM Oil #1
ASTM Oil #2
ASTM Reference Fuel A
ASTM Reference Fuel B
Benzene
Butane
Butyl acetate
Carbon mono Oxide
Carbon tetra Chloride
Chloro Form
Chlorosulphonic Acid
Cyclo Hexane
D.O.P
Ethyl Acetate
Ethyl Alcohol
Ethyl Chloride
Ethylene Dichloride
Ethylene Glycol
Ethylene Oxide
Form Aldehyde
Formic Acid
Freon
Gasoline
Glycerin
n-Hexane
Hydrazine |
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x
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△
x
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◎
x
x
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x |
Hydro
Chloric Acid
Hydrogen
Isopropyl Alcohol
Mercury
Methyl Alcohol
Methyl Ethyl Keton
m-Cresol
Methylene Chloride
Naphthalene
Nitric Acid
o-Chloro Phenol
Per Chloro Ethylene
Phenol
Potassium Hydroxide Solutions
Sea Water
Silicone Grease
Soapy Water
Salt Water
Sodium Hydroxide
Steam 100
Steam 110
Sulfuric Acid 5%
Sulfuric Acid 10%
Toluene
Trichloro Ethylene
Triethanol Amine
Water
Water 100
Xylene |
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x
x
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x
x
x
x
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x
◎
○
○
x
x
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○
◎
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| ●(very good resistance) > ◎
> ○(good resistance) > △ > x(soluble) |
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