There are three technical issues to be solved for the design of the GNFC20 nickel cadmium prismatic sealed alkaline battery with plastic case that are to reduce the internal resistance,to decrease the internal pressure during charge and to make the gas vent pressure of safety valve reasonable and steady.

Application of bolts with plastic expansion shell;

Authors expound plastic formwork technology for open waffle slab of clean room in IC workshop systematically,and discuss the key problems in construction and controlling method.

Meanwhile, according to some key construction techniques, plastic formwork technique and bottom girder treatment skill detailed introduction is made.

The development and research on the citation plastic shell was reviewed in this paper.

The problem of the halt caused by ESD for an IP set top box with plastic enclosure is discussed in detail,and this prob- lem is solved by modifying the PCB plane arrangement and layout.