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Manipulator for working in the connection-piece region of a container of the primary circuit in a nuclear power plant, particularly for non-destructive testing
Manipulator for working in the connection-piece region of a container of the primary circuit in a nuclear power plant, particularly for non-destructive testing
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机译：用于在核电厂一次回路容器的连接件区域中工作的机械手，特别是用于无损检测的机械手
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摘要
In a process for manufacturing plastic mouldings from a reactive foam material such as polyurethane, at least two liquid reactants are mixed while incorporating finely dispersed air, and the resultant reaction mixture is injected through a gate into an assembled cavity of a mould, displacing the air in the latter and causing a build up in internal pressure in the mould which decreases as the distance from the gate increases, and hardens by chemical reaction in the cavity to form a moulding. To improve the mechanical properties of prefabricated parts and to smooth the surface pores, the internal pressure in the mould in at least one region, preferably remote from the gate, already filled with reaction mixture is increased shortly after the end of injection and the reaction mixture, which is in a gel-like transition state, is compacted, the air inclusions being compressed and/or released.
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