Conversion method compression molding

POs are processed using virtually every known thermoplastic conversion method. In some applications, such as film, pipe, or rotational molding, POs are the dominant materials in others, such as the injection or compression molding of highly reinforced composites, they are only starting to show their value. In summary, there are currently five major application sectors that consume the most POs ... 

As might be expected from our previous discussion of compression molding and extrusion, the conversion method could have an effect on the properties of UHMWPE. In practice, however, the differences between extrusion and... 

To demonstrate the usefulness of the ATR method for measuring infrared spectra from hard materials, the ATR spectrum in absorbance of a pellet of polystyrene is shown in Figure 13.11a, and compared with the absorbance spectrum recorded in transmission from a thin polystyrene film shown in Figure 13.11b. The film was formed from the pellet by using a hot compression molding press. Comparison of these two spectra clearly indicates that the relative intensities of bands toward higher wavenumbers in the ATR spectrum are weaker than those in the transmission spectrum, and conversely the relative... 

As might be expected from our previous discussion of compression molding and extrusion, the conversion method could have an effect on the properties of UHMWPE. In practice, however, the differences between extrusion and compression molding are slight in the hands of a skilled converter. In 2001, a survey was conducted by the author under the auspices of ASTM to evaluate the variation in physical and mechanical properties of UHMWPE as a... 

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