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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®.
<Table> Conditions of Injection Molding for Each Hardness
Item | Unit | KP3372 | KP3363 | KP3355 | KP3340 | |
---|---|---|---|---|---|---|
Cylinder Temperature |
Rear Middle Front Nozzle |
℃ | 200 ~ 210 | 200 ~ 210 | 180 ~ 190 | 160 ~ 170 |
225 ~ 235 | 220 ~ 235 | 200 ~ 220 | 170 ~ 190 | |||
225 ~ 240 | 220 ~ 235 | 210 ~ 220 | 180 ~ 200 | |||
Mould Temperature | ℃ | 230 ~ 240 | 220 ~ 235 | 230 ~ 240 | 185 ~ 200 | |
Mold Temperature | ℃ | 40 ~ 60 | 40 ~ 60 | 20 ~ 40 | 20 ~ 40 | |
Molten Polymer | ℃ | 230 ~ 240 | 220 ~ 235 | 210 ~ 220 | 185 ~ 200 | |
Screw RPM | RPM | 40 ~ 80 | ||||
Injection/Holding Press. | ㎏/㎠ | 300 ~ 1,000 | ||||
Back Pressure | ㎏/㎠ | 50 ~ 400 | ||||
Cycle Time |
In | Sec | 2 ~ 6 | 2 ~ 8 | 2 ~ 8 | 2 ~ 10 |
15 ~ 40 | 20 ~ 50 | 20 ~ 50 | 20 ~ 60 |
Injection Molding Machine : ENGEL 75ton(3oz) / Product : ASTM Specimen (Weight 41~46g)
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.
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.
Chemical | Effect | Chemical | Effect |
---|---|---|---|
Acetic Acid | ● | ||
Acetone | ● | Hydro Chloric Acid | △ |
Acetylene | ○ | Hydrogen | ● |
Aniline | X | Isopropyl Alcohol | ● |
ASTM Oil #1 | ● | Mercury | ● |
Methyl Alcohol | ● | ||
ASTM Oil #2 | ● | ||
ASTM Reference Fuel A | ● | Methyl Ethyl Keton | ● |
ASTM Reference Fuel B | ● | m-Cresol | X |
Benzene | ○ | Methylene Chloride | X |
Butane | ● | Naphthalene | ○ |
Butyl acetate | ○ | Nitric Acid | |
Carbon mono Oxide | ● | o-Chloro Phenol | X |
Carbon tetra Chloride | △ | Per Chloro Ethylene | X |
Chloro Form | X | Phenol | X |
Chlorosulphonic Acid | △ | Potassium Hydroxide Solutions | ◎ |
Sea Water | ● | ||
Cyclo Hexane | ◎ | ||
D.O.P | ● | Silicone Grease | ● |
Ethyl Acetate | ○ | Soapy Water | ● |
Ethyl Alcohol | ◎ | Salt Water | ● |
Ethyl Chloride | X | Sodium Hydroxide | ◎ |
Steam 100℃ | ○ | ||
Ethylene Dichloride | X | ||
Ethylene Glycol | ● | Steam 100℃ | X |
Ethylene Oxide | ● | Sulfuric Acid 5% | ◎ |
Form Aldehyde | ○ | Sulfuric Acid 10% | ○ |
Formic Acid | ○ | Toluene | ○ |
Trichloro Ethylene | X | ||
Freon | ● | Triethanol Amine | X |
Gasoline | ● | Water | ● |
Glycerin | ● | Water 100℃ | ○ |
n-Hexane | ● | Xylene | ◎ |
Hydrazine | X |
●(very good resistance) > ◎ > ○ (good resistance) > △ > X(soluble)