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Thursday, 25-Feb-2010 01:52 Email | Share | | Bookmark
Plastic Mold Surgery Through the Ages

plastic mold has become massively popular with television shows and celebrities getting improvements right and left. You might be wondering about Plastic Mold, specifically where it came from.

Plastic Mold Through the Ages

To start off, Plastic Mold is term used to describe a surgical procedure to modify a normal part of your body for an aesthetic purpose. It is almost always a voluntary surgery and should not be confused with reconstructive surgery which is usually undertaken to fix an abnormal part of the body caused by disease, trauma and so on.

The term plastic mould has nothing to do with the material known as plastic. Instead, it derives from the Greek language, much as many modern medical terms do. Plastikos means to mold or shape something in Greek, which roughly translates Plastic Mold as meaning a molding surgery. If you think about it, this is a very exact terminology since it is exactly what happens.

Plastic Mold is, to the surprise of many, not a modern medical procedure. While techniques are certainly advanced these days, the basic surgical premise is known to have existed since the eight century BC. Susrutha, an Indian surgeon, was known to undertake skin grafts during this period. He was also known to do nose reconstruction, which may sound odd until you realize nose amputation was a common penalty for certain crimes during that period. Ouch!

As seems to be the case with any discussion of the ancient past, the Romans also made advances in Plastic Mold. They were known to perform Plastic Mold to repair defects of the ear, or at least perceived defects.

Throughout the centuries, rapid prototype existed but was less common. It was not until the last two centuries that it started to gain in both popularity and occurrence. John P. Mettauer is generally considered the first plastic surgeon in the United States, and practiced in the 1820 to 1840s. He was renowned for designing his own instruments, many which form the basis of modern surgical instruments associated with plastic mould.

Although rapid prototype has always had a place in the medical profession, its position as a popular procedure is relatively recent.

Ricardo de Silva is with PlasticSurgeonPractices.com a directory of Plastic Mold. Visit us to read more articles about Plastic Mold.


Wednesday, 24-Feb-2010 02:02 Email | Share | | Bookmark
A Brief Understanding of How Plastic Mold are Made

plastic mold and materials are now an intrinsic part of everyday life as most of what people use at home, work and in their day-to-day activities have plastic parts or moulds in one form or another. Most people can be amazed on the wide variety of shapes, sizes and functions that can be derived from plastic molds and many often wonder how the manufacturers were able to produce them.

Historically speaking, plastic was first produced by Alexander Parks back in 1851 and called his first product Parkesine - a result of turning organic materials into a non-organic form through moulding. John Wesley Hyatt eventually discovered a way in using this technology into a manufacturing industry that we know today.

The Types of plastic mold

There are basically two types of plastics available for commercial and industrial use. The first is the meltable type or what is technically known as thermoplastics. The other type is not meltable and these are called thermosets. The difference lies in their polymer structure. Thermoplastics can be melted again and reshaped into another form, while thermosets retain their shape and could not be reformed. There are a variety of applications that use each type of these mouldings while others can make use of both.

The Processes Involved in Making plastic moldings

There are a variety of ways that can be used to create rapid prototype from plastic and these are used depending on the kind of application where these mouldings are used. The most common and most popular method is injection moulding and is used in making a whole variety of plastic products for home, commercial or industrial use. In this method, melted plastic resin is forced into a small hole called a sprue and into the cavity of a pre-shaped mold through machines called injection moulders. The melted plastic slowly solidifies and takes form based on the shape of the mold.

Another process used to make rapid prototype is called the blow moulding method. This process is used to create plastic products with hollow parts like bottles, containers, and other items. In this method, pressurized gas is blown into a melted preform or what is called a parison. The preform slowly expands until it is pressed against the surface of the mold cavity where it slowly takes its final form.

plastic mold can also be produced through a compression technique. This process is one the most common and cheapest way of producing plastic parts, wherein a melted plastic resin is placed into the cavity of an open mold. The mold is then closed with a plug and pressure is applied until the resin takes shape and solidifies to achieve its final desired form.


Tuesday, 23-Feb-2010 01:31 Email | Share | | Bookmark
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.


Monday, 22-Feb-2010 02:06 Email | Share | | Bookmark
Carbon Steels Using Plastic Mold

Steels (first made in China and Japan around 600-800 AC) are generally divided into the categories of carbon steels and alloy steels (including plastic mold steels).

Carbon steels

Carbon steels are used extensively in plasitc mold construction. they are those steels which ony contain iron and carbon, and small amounts of other alloying elements. they are the most common and least expensive type of steels used for tools. The three principal types of them used for tooling are low carbon, medium carbon, and high carbon steels, Low density contains between 0.05% and 0.7% carbon. And high density contains between 0.7% and 1.5% carbon. As the carbon content is increased in carbon steel, the strength, toughness, and hardness also increase when the metal is heat treated.

Low density are soft, tough rapid prototype that are easily machined and welded. Due to thrie low carbon content, these steels cannot be hardened except by case hardening.Low carbon steels are well suited for the following applications: tool bodies, handles, die shoes, and similar situations where strength and wear resistance are not required.

Medium density are used where greater strength and toughness are required. Since medium’s have a higher carbon content they can be heat treated to make parts such as studs, pins, axles, and nuts. Steels in this group are more expensive as well as more difficult to machine and weld than low density.

High density are the most hardenable types and are used frequently for parts where wear resistance is an important factor. Other applications where high density are well suited inclued drill bushings, locators, and wear pads. Since the carbon content of these plastic mold material in so high, parts made from high’s are normally difficult to machine and weld.

Alloy steels

They are basically material with additional elements added to alter the characteristics and bring about a predictable chang in the mechanical properties of then alloyed metal. They are not normally used for most tools due to their increased cost, but some have found favor for special applications. The alloying elements used most often in steel are manganese, nickel molybdenum, and chromium.


Sunday, 21-Feb-2010 01:47 Email | Share | | Bookmark
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.


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