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Burnt streaks

Examples of mouldings with burnt streaks are shown in Figure 9.4. [Pg.184]

Top left Burnt streaks due to excessive residence time in the plasticising cylinder Top right Burnt streaks due to high shearing heat in the gate Bottom left Burnt streaks due to excessive residence time in the plasticising cylinder... [Pg.184]

Burnt streaks are caused by thermal damage to the melt. The result can be a decrease of the length of the molecule chain (silvery discoloration) or a change of the maeromolecules (brownish discoloration). [Pg.186]

Similar to thermoplastics, pigments and dyes are sensitive to excessive processing temperature and residence times. If thermal damage is the reason for colour streaks, they should be considered as burnt streaks. [Pg.187]

See other pages where Burnt streaks is mentioned: [Pg.227]    [Pg.163]    [Pg.166]    [Pg.184]    [Pg.184]    [Pg.186]    [Pg.186]    [Pg.273]    [Pg.227]    [Pg.163]    [Pg.166]    [Pg.184]    [Pg.184]    [Pg.186]    [Pg.186]    [Pg.273]    [Pg.50]    [Pg.288]   
See also in sourсe #XX -- [ Pg.227 ]

See also in sourсe #XX -- [ Pg.166 , Pg.184 , Pg.186 ]



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Burnt

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