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KOPEL®-TPC-ET

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®.

<Table> Conditions of Injection Molding for Each Hardness

<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)

Advice for Molding

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.

성형조건 주의사항
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)