| |
| |
| 1 |
Polyhydric alcohol |
| 2 |
MDI |
| 3 |
Butane diol |
| 4 |
Catalyst |
| 5 |
Twin-screw compounder ZSK |
| 6 |
Throttle-start-up valve |
| 7 |
Screen pack changer SWZ |
|
|
| 8 |
Underwater pelletizer UG |
| 9 |
Pellet water tank |
| 10 |
Pellet drier |
| 11 |
TPU |
| 12 |
Pellet water tank |
| 13 |
Pump |
| 14 |
Heat exchanger |
|
| The product |  |  |
Thermoplastic polyurethanes are characterized, depending on type, by:
| - | | High wear and abrasion resistance |
| - | | High tensile strength, tear strength |
| - | | Flexibility under cold conditions |
| - | | Resistance to oils, fats, oxygen, ozone |
| - | | Resistance to hydrolysis |
| - | | Good buffering capacity |
By varying the recipe and the raw materials, an extremely broad product spectrum can be achieved. The pellets are subsequently processed by injection molding or extrusion to form:
| - | | Engineered components such as rollers, gear-wheels, drive belts, screens |
| - | | Housings for electrical equipment |
| - | | Components for the automotive industry such as housings for external mirrors, shock absorbers, trims and panel trims |
| - | | Soles on sports shoes |
| - | | Ice-hockey and ski boots |
| - | | Profiles and sealants |
| - | | Cable sleeves |
| - | | Hoses and films, including for medical technology |
| - | | Artificial leather |
|
The raw materials
|
|
| Polyhydric alcohols (long-chain polyether- and polyester-diols) |
35-90 % |
|
Di-isocyanate (e.g. 4.4’ diphenyl-
methane di-iscocyanate, MDI)
|
5-50 % |
| Short-chain diols or diamines (e.g. butane diol) |
0-15 % |
|
Catalyst (e.g. organic
compounds of tin in solvent)
|
0,01-0,5 % |
| The production process | | |
The liquid or molten raw materials are metered into the twin-screw compounder in a stoichometric ratio. In the compounder, the reaction to form polyurethane takes place during continuous mixing and kneading. Excess reaction heat is removed through barrel wall. The product is discharged via a gear pump and a screen pack changer unit directly to an underwater pelletizer. The pellets are then subsequently aged in the down-stream drier plants and mixing and storage silos to form the product ready for sale.
|
Throughput *
|
|
| ZSK 54 Mv |
100-250 kg/h |
| ZSK 62Mv |
150-400 kg/h |
| ZSK 76 Mv |
300-700 kg/h |
| ZSK 98 Mv |
500-1.500 kg/h |
| ZSK 125 Mv |
1.500-3.500 kg/h |
* depending on the raw materials and the recipes
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