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Processing and Molding
of King Pearl EPS
A. Pre-Expansion
When beads are heated to 90¢X C by steam, in a continuous or
batch type pre-expander, the expandable polystyrene will soften, the blowing agent
incorporated in the beads will vaporize. The pressure causes the EPS beads to expand to
occupy 40~80times their original volume. It may reach its lowest and optimal pre-expansion
density earlier using less steam than other competitive brands. If the operation is not
controlled well, the over pre-expansion may occur which cause beads to wrinkle in order to
increase density.
right picture- High Density EPS (C-S grade) for Air Conditioner
- May be used in
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- Batch pre-expander
| Operating conditions |
E |
C |
B |
F |
| Main Steam Pressure(kg/cm2) |
4~5 |
4~5 |
4~5 |
4~5 |
| Chamber pressure (kg/cm2) |
0.1~0.15 |
0.15~0.2 |
0.15~0.2 |
0.1 ~0.2 |
| Heating Time(sec) |
50~ 60 |
60~80 |
50~60 |
50~60 |
| Keeping Time(sec) |
10 |
10 |
10 |
10 |
| Cooling time(sec) |
40~50 |
40~50 |
40~50 |
40~50 |
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- Continuous pre-expander
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| Operating conditions |
E |
C |
B |
F |
| Main Steam Pressure(kg/cm2) |
4~5 |
4~5 |
4~5 |
4~5 |
| Chamber Temperature(C) |
96~98 |
98~100 |
98~100 |
96~98 |
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B. Aging of Pre-expansion beads
Pre-expanded beads should age in silos for at least 4 ~ 24 hours, depending upon grades
and densities, to allow the air permeate back into the beads and moisture to vaporize.
When completely aged, the beads are elastic and dry.
C. Molding
The aged pre-foam may be molded into a coherent mass, whose shape is predetermined by
the mould. The density of the final molded product is usually determined by adjusting the
operation conditions at the initial pre-expansion stage. The molded product is rigid,
lightweight, good fusion and has closed-cell structure. The surface of molded product is
very smooth. The cycle time for molding can be adequately adjusted by considering the
following factors:
- o Type of molding machines.
- o Thickness of molded product
- o Mould design
- o Grade of Expandable polystyrene
It takes 60 ~ 120 seconds for one cycle time to mould EPS raw material using automatic
machines.
You may let us know if you need the following information. Please send email to us.
| Material Safety Data Sheet(MSDS) |
| Operational Conditions - Kurtz machines (Germany), Daisen machines
(Japan), Taiwanese machines. |
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