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| |
| 1 |
grav. feeder Aerosil |
| 2 |
grav. feeder silicon pol. |
| 3 |
grav. feeder silicon oil |
| 4 |
grav. feeder cross-linking agent |
| 5 |
grav. feeder catalyst |
| 6 |
Processing section |
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|
| 7 |
Main drive unit and gearbox |
| 8 |
Vacuum unit |
| 9 |
Start-up valve |
| 10 |
On-line viscometer |
| 11 |
Gear pump |
| 12 |
Screen pack changer |
| 13 |
Heat exchanger |
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| The product |  |  |
Typically chemically reactive single compo-nent systems where the cross-linking of the substrate is initiated through air humidity. As this occurs, the reaction products are split off. Following rapid skin-forming on the surface, the cross-linking continues inside the compound until there is complete hard-ening throughout. Starting from the poly-mers, we make a distinction between silicon sealing compounds (RTV) and PUR sealing compounds.
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The raw materials
|
|
| Silicon polymers |
30-50 % |
| PUR pre-polymers |
30-50% |
| Silicic acid |
5-10% |
| Chalk |
25-45% |
| Carbon black |
0-3% |
| Softeners |
15-40% |
| Catalyst |
1-2% |
| The manufacturing process | | |
The elastomers are metered individually or as a premix, using a gravimetric feeder, into the feed barrel. After plasticizing / masticating and compounding the various rubbers, the resins (solid or liquid) and softeners / oils are added downstream. For larger quantities, the liquid can be fed at several locations along the extruder, using multiple kneading and homogenizing stages to avoid pin-holing. Depending on the later processing, additional process stages such as degassing to remove air and volatile components or filtration of the finished compound is possible.
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Throughput*
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|
| ZSK 34 Mv |
200-300 kg/h |
| ZSK 54 Mv |
350-600 kg/h |
| ZSK 62Mv |
600-900 kg/h |
| ZSK 76 Mv |
900-1.500 kg/h |
| ZSK 98 Mv |
2.000-3.200 kg/h |
| ZSK 125 Mv |
3.500-6.000 kg/h |
* depending on the raw materials and the recipes
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