Injection-compression moldings ICM

Usually called injection-compression molding (ICM). Details are in Chapter 4. The essential difference when compared to IM lies in the manner in which the thermal contraction in the mold cavity that occurs during cooling (shrinkage) is compensated. With conventional injection... 

Injection compression molding (ICM) is, similarly to the gas injection technique and thermoplastic foam injection (TFI), particularly well-suited to making thick-walled moldings with little warping and few sink marks. However, thin-walled parts with long flow paths can also be produced efficiently by means of ICM. 

The injection-compression molding (ICM) process starts, as shown in Figure 1, with the closing of the mold until the compression gap is reached. At this point, the mold is already sealed, because it is equipped... 

In injection compression molding (ICM), the elastomer is injected in a slightly open mold using an injection unit. The mold is then totally closed or closed leaving a minimum gap (1/100 mm). Using this process combination, it is possible, to manufacture flat precision components that are still attached to a skin , such as 0-rings,... 

GINA graphical integrated ICM injection-compression molding... 

ICM injection-compression molding IMC internal model control... 

The possible pressure reduction is the reason for using ICM for the production of decorated moldings, such as used in the automotive industry (e.g. in-mold decorated door panels) [1, 2]. Another application of this process are thin-waUed moldings with wall thicknesses below 0.5 mm and a flow path/wall thickness ratio below 150. Finally, there are parts for optical applications which benefit from the reduced shear rates and the more tmiform molecular orientation along the flow path, using injection-compression molding. 

I moment of inertia IB isobutylene IBC internal bubble cooling IBM injection blow molding IBM International Business Machines IC Industrial Computing publication ICM injection-compression molding ID internal diameter lEC International Electrochemical Commission... 

By contrast with ICM, a compression mold design is used where male plug fits into a female cavity rather than the usual flat surface parting line mold halves for IM (Fig. 8-27). The melt is injected into the cavity as a short shot thereby not filling the cavity. The melt in the cavity is literally stress-free it is literally poured into the cavity. Prior to receiving melt, the mold is slightly opened so that a closed cavity exists the male and female parts... 

In ICM, injection is followed by compression. A precisely predosed plastic melt is injected into the mold, through the compression gap opening, during the injection phase. 

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