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Posts Tagged ‘Basics’

This is an excerpt from the third program in our Injection Molding Basics Series, “Mold”, that uses 3D animation to illustrate the basic components of the A-half of a typical 2-plate mold assembly, including the clamp plate, leader pins, cavity retainer plate, sprue bushing and locating ring. Our Injection Molding Basics series provides participants with a general understanding of the three major aspects of injection molding; the injection molding machine, the molding process, and the injection mold. These programs use 3D animation to demonstrate the inner workings of the machine and mold and to easily convey otherwise complex concepts. Important safety precautions are stressed throughout these training programs. A. Routsis Associates – Complete Training Solutions for the Plastics Industry. Visit www.traininteractive.com for state-of-art plastics training, including interactive CD-ROM and online training.
Video Rating: 5 / 5

This excerpt discusses Material Preparation and handling of plastics, including mixing of plastic material and additives (such as impact modifiers, fillers, flame retardants, mold release agents, plasticizers, reinforcements, heat stabilizers, lubricants and colorants), using dessicant dryers for material drying and dew meters for evaluating the moisture content of a plastic material. Our Injection Molding Basics series provides participants with a general understanding of the three major aspects of injection molding; the injection molding machine, the molding process, and the injection mold. These programs use 3D animation to demonstrate the inner workings of the machine and mold and to easily convey otherwise complex concepts. Important safety precautions are stressed throughout these training programs. A. Routsis Associates – Complete Training Solutions for the Plastics Industry. Visit www.traininteractive.com for state-of-art plastics training, including interactive CD-ROM and online training.

Plastic Mold Basics

Plastic is one of the most used materials in the manufacturing of toys, tools, and other consumer goods. It’s very name, ‘Plastic’, from the Greek ‘plastos’ refers to ‘molded’. It is clear that the material plastic’s real value lies in the ways in which it is used and Plastic Mold. Plastic is extremely malleable, and allows or it to be pressed, extruded, cast, or molded into many different shapes and forms.

Plastics are used in a wide range of rapid prototype products, from every day office products such as pens, clips, and printers, to high-end uses such as TV’s, stadiums, and space shuttles. Before plastic’s wide adoption across many different industries, other materials such as wood, stone, glass, ceramic, and leather were the standard products used. Now, to find products made of leather and stone indicates a certain quality and ‘rareness’ because most of our ’stuff’ is plastic. Plastic has displaces all of these traditional materials and is now the dominant material in all of manufacturing.

The drawbacks to using plastic stem from its chemical makeup. The compounds comprising rapid prototype limit its ability to withstand heat and makes it vulnerable to hard impacts and weight. Plastics are limited in how dense and hard they can be made to be which causes many of these weaknesses. Additionally, plastics are not highly conductive of electricity, and so they are limited in use around electronic components. Additionally, the price of plastic molding and work limits its use as a building material (aside from PVC) in construction projects because it is still to expensive when compared to working with concrete and lumber.

Polyvinyl Choloride is an extremely useful plastic. Commonly referred to as PVC, it is used heavily in plumbing but also has many practical uses such as framing out large shapes and many other uses where tubing is involved. It other forms, PVC can be used in rain gear, packaging of food, shrink wrap, home siding, computer enclosures, and many other places in which most people don’t expect.

Plastic has truly revolutionized how the world operates. We now can have many tools and utensils because they can be developed and manufactured very cheaply with plastic. If plastic were not around, many of our standard household items would have to be made out of more expensive materials, thus limiting the ability for most people to obtain them. Plastic is cheap, extremely malleable, and very stable, and thus has many different uses which people all over the world have researched and continue to research to push the possibilities of plastic.

For research, data, and information on Plastic Mold visit Michael’s Plastic Mold Site.

There are a ton of links, resources, and data on plastic injection mold, machines, manufacturing, and more.

Rapid Plastics – Injection Molding?S Basics

Injection molding is a manufacturing technique for making parts from both thermoplastic and thermosetting plastic materials. Heated, fluid plastic is injected at high pressure into a plastic mold, which is the opposite of the desired product shape. Injection molding is widely used for manufacturing a variety of parts, from the smallest component to entire body panels of car.The process of injection molding can be described in four simple steps. These include Plasticizing, Injection, Chilling, and Ejection. Each of these steps is different from the other and the right procedure is required for the successful completion of the total process.

These steps can be discussed as follows:

Plasticizing
IT involves the conversion of the polymer material from its normal hard granular form at room temperatures, to the liquid which is necessary for injection at its correct melting temperature.

Injection
This is the stage during which this melt is introduced into a plastic mold to completely fill a cavity or cavities.

Chilling
It is the act of removing heat from the melt to convert it from a liquid consistency back to its original rigid state.

Ejection
The ejection phase is the last phase where the removal of the cooled, molded part from the plastic mold cavity is done.

Pelletized or powdered materials that are used in injection molding machines are mostly:

o Ethylene
o Polystyrene
o Polycarbonate
o Polypropylene
o Acrylonitrile-Butadiene-Styrene (ABS)
o Nylon

The use of these basic steps in sequence or as a cycle is the process of injection molding done to obtain or manufacture parts. Cycle time usually ranges from 10 to 100 seconds and are controlled by the cooling time of the melted plastic. The melted plastic comes from hard rapid prototype plastic pellets that are fed into the hopper of the injection-molding machine. The pellets or plastic powder is melted inside the machine and then forced into the mold through a nozzle by a long screw within a heated cylinder. It is the most common method of production, with some commonly made items including bottle caps and outdoor furniture. Injection molding typically is capable of tolerances.

Plastic molding applications are used in medical field like components for blood analyzer equipments, heart pump parts, orthopedic devices and custom knee braces. In automotive engineering it is used for mechanical levers, gears, gaskets and switches. It is also used for aerospace, automotive, avionics and computer components.

Rapid Prototyping – EMS USA provides rapid prototype services, such as Stereolithography (SLA), rapid tooling, and rapid manufacturing.

Find More Plastic Injection Articles

The basics of a plastic injection molding system. From BeechmontCrest.com