3. Two-step Ejection by U-limit frame U The two-step ejection systems shown in Fig. 6.33 consisting of U-limit frame 4 connected to the movable fixing plate 7 and swing bar 3 fixed supporting pl...

The general properties of crystalline polymers are: distinct and sharp melting point, higher specific gravity, higher tensile strength and tensile modulus, lower ductility and impact strength, creep r

The upper system starts during mold opening, the lower system begins the ejectio only in the second ste. Two-step Ejection by Spring

The rate of crystallization is dependent on temperature, of which there are two significant points: ( The glass transition temperature. Below Tg, there is virtually no molecular motion on a local scal

Depending on the shape of the workpiece, there are four constructions as following are used for the design of two-step ejection systems

Crystal growth is achieved by the further addition of folded polymer chain segments and only occurs for temperatures between the melting temperature Tm and the glass transition temperature Tg Higher t

If the use of a stripper plate is insuficient for safe ejecting the workpiece, the inner surfice of the workpiece has to be pulled off the hole-shaping pin 4 by an ejector sleeve 18 as shown in Fig...

Crystal formation begins at nucleation points and extends outwards into the bulk of the polymer. Nucleation starts with small, nanometer-sized areas where as a result of heat motion some chains or the

The Fig6.27 shows the workpiece removed from the mold by a stripper. The forming core 14 or insert arranged in the stationary part moves in an axial direction.