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МнениеПубликувано на: Пет Яну 14, 2022 6:43 pm 

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Plastic finished products come in a variety of shapes and sizes, but they all originate in the same place and are made from the same raw materials as one another. The resin beads used in plastic extrusion are melted down, filtered to ensure uniform consistency, and then forced through a die cut to form the final product shape before being allowed to cool.

Plastic extrusion is used to manufacture a diverse range of products available on the market, ranging from building materials to consumer goods to industrial components and components. Among the thousands of custom profiles produced by extruded aluminium pipe, window frames, electrical covers, fences, edging, and weather stripping, to name a few of the more common items.

Technical expertise is required for the procedure in and of itself. However, it can be boiled down to a simple five-step process.

During the first step, raw plastic materials like granules, pellets, or powders are loaded into a hopper and then fed into an extruder, which is a long, heated cylindrical chamber with a nozzle at one endIt is propelled through this chamber by a revolving screw mechanismSome extruders can have one or two revolving screws, depending on the modelThe raw materials are fed from the hopper through the feed throat and onto a large spinning screw that operates within a horizontal barrel at the bottom of the step Because not all materials have the same properties, the raw material is processed at a temperature that is specific to the type of raw material that is being passed through the machineAt the other end of the heated chamber, the molten plastic is forced through a small opening known as a die, which shapes the finished product into the desired shapeAs the plastic is extruded from the die, it is conveyed to a cooling conveyor belt where it is allowed to coolCooling can be accomplished through the use of air or waterWhen melted plastic is forced through a die instead of being forced into a mold, the process is very similar to that of injection moldingThe die for an individual plastic profile is designed in such a way that the plastic flows smoothly and evenly from the cylindrical profile of the extruder into the final profile shape of the individual profileConsistency in this flow is essential for producing a finished product that is free of defects
Pipes are produced in the same way as other types of plastic extruded aluminium tubing: by horizontally extruding molten polymer through an annual opening into several sizes, followed by cooling devices that stabilize the final dimensions. It is possible that materials will have to be compounded in order to be used in pipe production. PVC, for example, is used by a large number of pipe manufacturers. The resin is heat sensitive, and under normal processing conditions, it has a high viscosity, which prevents it from being processed. It must be compounded in order to process. Other polymers, such as PE or ABS, can, on the other hand, be used directly from the manufacturer, without the need for compounding if the appropriate grades are used.

It is a process in which the additives are mixed together with the base resin in order to produce a homogeneous mixture. The additives are used to either improve the ability of the process or improve the performance of the product. The following ingredients are added to PVC during the pipe manufacturing process:

Plasticizers are used to soften the resin, reduce its viscosity, and make the PVC manufacturing process more straightforward. PVC plasticizers such as epoxy and di-ethyl hexyl phthalate (DOP) are common in the industry. Heat stabilizers are required to keep PVC from degrading due to the high temperatures used in the manufacturing process. The degradation process involves the discoloration of the resin and the formation of HCL. Lead stabilizers have been used throughout the process. Because of the toxicity of PB. Today, the most commonly used stabilizers are tin-based, specifically di-butyl tin maleate. Lubricants are used to reduce friction during processing, which can lead to degradation if not controlled correctly. There are two types of lubricants that are used. Both external and internal factors are considered. The first, calcium stereate, and the second, wax, are used to reduce friction during the manufacturing process between metal surfaces and polymer. Slippage is caused by the latter stearic acid friction that arises from the polymer chain.

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