Магистерская диссертация тема работы Разработка цифрового двойника технологического процесса с использованием производственных данных

1.2.5 Melt flow piping

The caloduc heating system provides uniform temperature on the entire inner surface of the pipe, which enhances the quality of the film.

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The liquid turns into vapor at production temperature (max 260°C). The vapor is distributed equally along the melt line, including the flanges, heating uniformly the melt by condensation. The vapor permanently circulates inside the double-chamber, providing an excellent temperature accuracy.

1.2.6 Die body

The melt of plain film and the co-extruded film is discharged by the die. The die distributes the melt stream or melts streams (in case of co-extrusion) of the same thickness across the total width. Temperature and die lips opening can be adjusted.

1.2.7 Die adjustment

During production, there are changes in the film profile. Therefore, the film tolerances must be corrected accordingly by readjusting the die lip. The coarse adjustment of the profile is made manually from the die flexible slide lip by adjusting the coarse adjustment of the profile is made manually from the die flexible slide lip by adjusting the length of bolts. The fine adjustment and control are taken over by the thickness gauge.

1.2.8 Die exhaust hood with blower

A hood is located above the die for removing the hot air, fumes, and volatile released by the polymer during production. The main function is to avoid an accumulation of oligomers in the chill roll area.

1.3 Film casting unit (general description)


1.3.1 Film casting machine

The film casting machine draws the melt from the die. In this unit, the film is strengthened by cooling down. For this process, a big cooling roll, called “chill roll” is used.

The casting unit performs two main functions:

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  To achieve proper and uniform pinning of the melt flat sheet on the chill roll.
  

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  To rapidly cool down the molten flat sheet to achieve the desired crystallinity.