Explain why operations such as blow molding and film-bag making are done vertically and why buildings that house equipment for these operations have ceilings 10 m to 15 m (35 ft to 50 ft) high. They are done vertically so that the gravitational force does not interfere with the operation. The height of ceilings is dictated by product requirements. The height is large enough so that the blown tube can be cooled from a semi-molten state to a solid state suitable for compression, cutting and recoiling.
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