MANUFACTURING PROCESSES OF PLASTIC - Coggle Diagram
MANUFACTURING PROCESSES OF PLASTIC
A cordless screw presses in and out of the nozzle. A continuous piece of long force and short section is obtained, which is cooled by a jet of cold water or air.
The mold is placed in a molten plastic bath, the plastic solidifies when it cools and takes shape
Extrusion is a manufacturing process used to create objects with defined and fixed cross section. The material is pushed or extracted through a die of a desired cross section. The two main advantages of this process over manufactured processes are the ability to create very complex cross sections and work with materials that are brittle.
The molten plastic from the extruder is forced to move between a set of cylinders. The cylinders are closer at each step. Thus, the thickness decreases and the width increases.
Thermostable plastics can be "foamed" with air or special agents, which can obtain spongy and very light materials.
Polymer injection or injection molding is a semicontinuous process that involves injecting a polymer in a molten state into a closed mold under pressure, and through a small hole. Inside the mold the material solidifies. The piece or final part is obtained by opening the mold and removing the piece from the cavity. Injection is a very popular technique for making items.
It is applied on thin sheets of plastic that, held by their edges and softened by heat, will adapt to the shape of a mold when the vacuum is sucked by the air that remains between the plastic and the mold.