Injection Molding Process
Injection molding, reaction injection molding, rotational molding, blow molding, compression molding, extrusion molding, casting, transfer molding, thermoforming, vacuum-forming and blown film extrusion Molding plastic to transform it into needed shapes request many processes which. Each method has it own benefits and requests specific expertise and skill to execute. Injection molding process is one of the most widely used. This article is a brief description of eachInjection Molding Process step.
Injection Molding is a high production process to build thermoplastic parts into shapes ranging from simple to complex. Injection mould cavities are filled with melted plastic material that is forced under high pressure then through a gate into the cavity. The material is cooled to the point that the material is solid and then ejected from the mould as a finished part.
Reaction injection molding is similar to injection molding. It requests a curing reaction to occur within the mold.
Rotational molding involves a heated hollow mold which is filled with a charge or shot weight of material. The mold continues to rotate at all time to avoid sagging or deformation also during the cooling phase.
Blow molding is used to create hollow plastic parts for example bottles and jars in large volume. The blow molding process begins with melting down the plastic and forming it into a parison or preform. The parison is then clamped into a mould and air is pumped into it. Once the plastic is cooled and hardened the molds open up and the part is ejected.
Compression molding is used to process many varieties of thermoset plastics and composites including phenolic, epoxy, melamine, and dially phthalate. Shapes that can result from extrusion include T-sections, U-sections, square sections, I-sections, L-sections and circular sections.
Extrusion molding is a manufacturing process used to make pipes, hoses, tracks, rods, and fibre. The granules melt into a liquid which is forced through a die, forming a long ‘tube like’ shape.
Roto casting uses self-curing resins in an unheated mould, and shares slow rotational speeds in common with rotational moulding.
Transfer Moulding is another method to mold thermoset materials where the design of the part is too complicated or unsuitable for compression moulding. It is used when metal inserts, studs, connector pins wear plates, electronic components or other parts are molded into the part.
Thermoforming is a rapid manufacturing process when a plastic sheet is heated to a pliable forming temperature, formed to a particular shape in a mold.
Blown Film Extrusion is used in the manufacture of plastic film for products such as shopping bags and continuous sheeting. This process is the same as a regular extrusion process up until the die.
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