LIM - SI - Momentive Performance Materials Inc

Kunststoffe international, 2005-11-21, Silicone Composites
...st a short period of time. Since it was first brought onto the market at the start of the Eighties, it has gained a share of around 10 % of the silicone rubber market [1]. Liquid silicone rubber can be readily processed by liquid injection moulding (LIM), a process similar to thermoplastic injection moulding, and offers an outstanding property profile: - hot-air stability up to + 180°C (with stabilisers up to + 250°C and, for short periods, up to + 300°C) - low-temperature flexibilit...

Kunststoffe international, 2005-11-21, The Hot-And-Cold Solution
...e transfer process, i.e., two moulds and two injection moulding machines are needed. The semi-finished part (substrate) is transferred by a gantry robot from the first injection moulding machine to the second station of a liquid-injection moulding (LIM) machine. In order that these components may also benefit from the advantages of co-injection, the company Braun Formenbau GmbH in Bahlingen/Germany has devised a mould that offers an alternative to the transfer process. Thermal Isolation of the ...

Kunststoffe international, 2006-01-26, Structuring and Ablating: Manufacturing Medical Products with Laser Technology
...h explosive-like material ablation. Moreover, only a small fraction of the incorporated pulse energy remains in the work piece as heat; the preponderance is dissipated by the hot fragments. Expansion by the thermal zone of influence can thus be limited to less than one micrometer, unlike the case for processing with IR radiation, which has typical optical penetration depths in the 100-µm range. For some materials, the spectral emission from CO2 lasers can be adjusted such that absorption in the ...

Kunststoffe international, 2009-02-17, Optimized Silicones for Medical Applications
...s by semi-automatic or automatic injection molding and by compression and transfer molding. LSR grades, on the other hand, are two-component materials that cure by fully-automatic injection molding – liquid injection molding (LIM). RTV grades can be manually processed (by ing, brushing or knife-coating) and also fully-automatically processed. A New Dimension of Wound Dressing Due to their exceptional properties, Silpuran products are suitable for numerous medical applications, ranging from plast...

Kunststoffe international, 2010-04-20, From Natural Rubber to High-Tech Material
There are many reasons why the high performance of synthetic rubbers is not widely known today: Parts that are made out of them are not especially eye-catching since they are often black and carry out their assigned tasks out of the limelight. Another possible cause lies in the history of rubber. Particularly in the early days of these materials they were intimately linked to natural rubber which is produced from the sap of the rubber tree. Hard rubber manufactured from this sticky substance is ...

Kunststoffe international, 2012-06-25, From the Formulation to the Finished Product
...boratory heating-cooling mixer (type: FML10 – KM23; manufacturer: Zeppelin Reimelt GmbH) (Fig. 3) and a container mixer. The properties of the WPC dryblends were then systematically characterized by visual examinations such as light (LIM) and scanning electron microscopy (SEM), and by determining the bulk density, flowability, moisture content, plasticizability and processability. Profiles were extruded from the blends and their mechanical properties, water absorption and dimensional change were...

Kunststoffe international, 2012-08-22, Integration is the Magic Word
... is so low – roughly the same as that of blood at room temperature – that it infiltrates the finest fiber filaments without damage and can be used to introduce custom fiber structures in a load-oriented manner. The process also eliminates the energy losses of existing processes in which semi-finished products must be reheated. The way to merge what were previously multi-stage production processes into one operation was also demonstrated by two manufacturing cells featuring large-scale machines f...

Kunststoffe international, 2012-09-17, Efficiency Meets Process Integration
...e is equipped with a pack for LSR processing (in particular the injection unit, vacuum pack etc.) and produces a spectacle case of a PBT-GF20 and LSR with a cycle time of 50 s by the two-component LIM process in a 1+1-cavity mold (manufacturer: Rico Elastomere Projecting GmbH, Thalheim, Austria) The servo rotation unit is integrated into the machine. At the optoelectronic/micro injection molding interface, Wittmann Battenfeld presents the production of a focusing device for optical lenses from P...