A Continuous Sheet Of Plastic Is Formed
The forming section of a plastics plant puts out a continuous sheet of plastic that is 1 2 m wide and 2 mm thick at a rate of 15 m min.
A continuous sheet of plastic is formed. Anything thinner is considered plastic film. Plastics extrusion is a high volume manufacturing process in which raw plastic is melted and formed into a continuous profile. There is a huge universe of plastic film materials from those made of a simple single plastic material to complex structures made of different materials and coatings designed to meet the needs of specific applications. Because the walls of the mold are water cooled the plastic quickly solidifies and the bottle can be ejected.
February 5 2015 by jordan katz. In the most common method of high volume continuous thermoforming of thin gauge products plastic sheet is fed from a roll or from an extruder into a set of indexing chains that incorporate pins or spikes that pierce the sheet and transport it through an oven for heating to forming temperature. The forming region of a plastics plant puts out a continuous sheet of plastic that is 1 2 m wide and 2 mm thick at a rate of 15 m min. The temperature of the plastic sheet is 90 c when it is exposed to the surrounding air and the sheet is subjected to air flow across the width of the sheet at 30 c and at a velocity of 3 m s.
Plastic sheets are defined as a continuous form of plastic material thicker than 010 25mm and usually wound on a core but mostly cut into sheets. After the mold closes the parison is inflated like a balloon until it fills the empty cavity. The heated sheet then indexes into a form station where a mating mold and pressure box close on the sheet with vacuum then applied to remove trapped air and to pull the material into or onto the.