PVC production involves a mixing unit, extruder, mold, and cutting machine. Chemical ingredients are mixed to create a liquid mixture that is pushed through the extruder and molded into various shapes before being cut and stacked for shipping.
Polyvinyl chloride (PVC) is a type of plastic common in building and construction materials. The various types of PVC components are made on a PVC production line. Typical components of a PVC production line are the PVC mixing unit where the plastic formula is combined and an extruder which pushes the plastic out of the mixer in liquid or softened form. Other components in a PVC production line are the mold and the vacuum molding machine. A cutting machine and stacker/sorter commonly complete the production line equipment in a PVC manufacturing plant.
Similar to many chemical components, PVC begins as chemicals that must first be mixed in the right amount to produce the PVC plastic material that will be molded into useful components for everything from plumbing to siding materials. PVC production begins with a mixing machine or unit that drives the PVC production line and combines the various chemical ingredients into a liquid mixture. Equipped with a balance that weighs the different components and a thermometer to monitor the temperature setting required for the activation of the PVC mixture, the mixing unit is the first step in the production of a PVC plastic product.
The machine that follows the mixer on a typical PVC production line is the extruder. An extruder is the part of the machine that pushes the PVC plastic out of the mixer and into the molds or dies. Commonly designed with screw components known as tapered screws, the PVC production line often uses more than one extruder machine to empty the plastic mixing machine. As the screws turn, the liquid plastic is pulled between the spiral twists of the extruder and travels along the screw to the next stage in the production line, the press.
Molding machines are used to cast soft PVC plastic into the desired shape or form. Round PVC plastic pipes, pipe fittings and flat panels are some of the most common PVC mold shapes used on a production line. The extruder pushes the plastic into the molding machine, where a detailed mold or mold is filled with the plastic until there is no empty space left inside the mold. Some production lines use a vacuum molding machine to remove trapped air from the mold before it hardens. One of the final steps on a PVC production line is the cutting and stacking machine which cuts the PVC to length and places the pieces onto a pallet for shipping.
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