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German RepRap X400 Manual

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X400 3D-Printer Manual
Seite 256 /
Revision 367
Stand 08.01.201414:30
Glossar
© German RepRap GmbH 256 /
Polylactic acid (PLA) Polylactic acid or polylactide (PLA) is a thermoplastic aliphatic polyester
derived from renewable resources. One route to poly(lactic acid) is the
direct condensation of lactic acid monomers. Polymerization of a racemic
mixture of L- and D-lactides usually leads to the synthesis of poly-DL-lactide
(PDLLA), which is amorphous. Use of stereospecific catalysts can lead to
heterotactic PLA which has been found to show crystallinity. The degree of
crystallinity, and hence many important properties, is largely controlled by
the ratio of D to L enantiomers used, and to a lesser extent on the type of
catalyst used.
Polystyrene (PS) Polystyrene (short PS, other name : Thermocole) is an amorphous or semi-
crystalline thermoplastic. Amorphous Polystyrene is a very popular plastic,
needed in many fields of everyday life.
Selbstschmiereffekt Die Hochleistungspolymere der Gleitlager setzen sich zusammen aus:
Basispolymer Fasern und Füllstoffen Festschmierstoffen Komponenten sind
nicht schichtweise aufgetragen, sondern homogen miteinander vermischt.
Der Vorteil dieses Aufbaus wird besonders deutlich, wenn man sich einmal
die Anforderungen an die Oberfläche eines Lagers verdeutlicht: 1. Der
Reibwert, der besonders durch die Oberfläche des Lagers bestimmt wird,
soll möglichst gering sein. 2. Die Oberfläche darf sich unter den Kräften,
die auf das Lager wirken, nicht wegdrücken. 3. Die Verschleißkräfte wirken
besonders auf die Oberfläche der Lager, hier muss das Lager besonders
widerstandsfähig sein. Den einen universellen Werkstoff, der all diese
Aufgaben gleich gut erfüllen kann, gibt es nicht.
… 256


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