What Is Polymer?

by Maria Ross

Almost everything around you involves some form of plastic.

Plastic injection molding is the most important process in the manufacturing of plastic parts. Melted plastic is injected into a mold cavity until it cools and forms a specific plastic shape. Plastic injection molding is very useful when the plastic parts that need to be produced are too complex or expensive to do by machine. With plastic injection molding, many parts can be made simultaneously.

Some plastic injection molding companies take your concept from initial prototype through production, delivery and finishing. They have a trained staff of experienced engineers, designers and toolmakers who work with clients from designing the concept to building the prototype and to the production of the actual custom mold.

With the use of sophisticated computer aided design and technology and the latest equipment, they can provide clients with a technically superior mold and assure every product’s success. Injection Molding provides detailed information on Injection Molding, Plastic Injection Molding, Injection Molding Machines, Custom Injection Molding and more. Injection Molding is affiliated with Custom Metal Stamping.

Plastic covers a range of synthetic or semi-synthetic polymerization products. They are composed of organic condensation or addition polymers and may contain other substances to improve performance or economics. There are few natural polymers generally considered to be "plastics". Plastics can be formed into objects or films or fibers.

Their name is derived from the fact that many are malleable, having the property of plasticity. Plastics are designed with immense variation in properties such as heat tolerance, hardness, resiliency and many others. Combined with this adaptability, the general uniformity of composition and light weight of plastics ensures their use in almost all industrial segments.

Plastic may also refer to any material characterized by deformation or failure under sheer stress; see plasticity and ductility. Plastics are polymers: long chains of atoms bonded to one another. These chains are made up of many repeating molecular units, or "monomers". The vast majority of plastics are composed of polymers of carbon alone or with oxygen, nitrogen, chlorine or sulfur in the backbone.

The backbone is that part of the chain on the main "path" linking the multitude of monomer units together. To customize the properties of a plastic, different molecular groups "hang" from the backbone (usually they are "hung" as part of the monomers before linking monomers together to form the polymer chain). This customization by pendant groups has allowed plastics to become such an indispensable part of twenty first-century lives by fine tuning the properties of the polymer.

Visit Cardinal Points Trading to source injection molding machinery and plastic products.



About the author:
Maria Ross is Doctorate in Industrial Chemistry. Please visit http://www.polymerpapers.com for more information.

Chinese Electronics

China has become the world leader in providing high quality consumer electronics. Big name electronics companies have set up shop to manufacture in China. Apple, Sony, and Motorola are some of the bigger names.

It seems the increasing appetite worldwide for electronic gadgets are feeding this "electronics factory" known as China. This appetite has let China the largest producer and supplier of consumer electronics products in the world. Chinese consumer electronics products are gaining popularity because of the well-known brands being manufactured in the country, and the quality of those products. Let’s not forget, too, the favorable cost to profit ratio of these Chines products.

Savvy wholesalers are looking to China first when they try to source products. The Chinese wholesale markets offer consumers and re-sellers in the United States a quick and profitable resource to build sales. Ordering in bulk from China and selling at competitive prices is a sure-fire way to make money.

China already has a good reputation for quality clothing, shoes, and basic commodities. And, Chinese manufacturers and wholesalers are increasingly turning to high-technology products. Sourcing and importing consumer electronics from China will help you meet customer demand.

But the question seems to be, "How to do it?"

You could spend hours researching Chinese export sites to find the ones that will communicate with you. Do they have the ability to cross the language barrier? What are their labor practices? Are you setting yourself up for a public relations nightmare? And then you must wonder, "Are they dependable" when it comes time to do business.

Or you could contact Cardinal Points Trading.

Cardinal Points Trading has the expertise in dealing with Chinese products and exporters. To source the product you need from China, a simple call is all it takes. Plus, you’ll get an American company behind your Chinese sourcing. No language barrier AND many years of international importing and exporting expertise. You won’t have to deal with the hassles of customs and paperwork; Cardinal Points Trading takes care of all that for you.

Visit Cardinal Points Trading today to see how easy sourcing wholesale Chinese electronics can be.

by John Jordan

Your Guide to Plastic Molding

By Mark Jansen

Plastics are synthetically produced non-metallic compounds. It
can be molded into various forms and hardened for commercial
use. Plastic molding products can be seen everywhere. Examples
are jars, protective caps, plastic tubes, grips, toys, bottles,
cases, accessories, kitchen utensils and a lot more.

Even the keyboard and the mouse that you use are made through
plastic molding. Even the plastic parts of the chair that you
are sitting on are created this way.

The basic idea in plastic molding is inserting molten liquid
plastic into a ready shaped mold, for example the mold of a
bottle. It will then be allowed to cool, then the mold will be
removed to reveal the plastic bottle.

Plastic molding can also custom-mold a wide variety of plastic
products including: garden pots, cabinets, office trays and
boxes, barriers, barricades and traffic signage and displays for
product and marketing promotions.

If you are planning to go into a plastic molding business, you
should first know the different processes. Choose from a plastic
molding process that fits your budget, your expertise, and your
resources. Here are basic definitions of various methods of
plastic molding.

The Plastic Molding Processes:

1. Injection Molding

In Injection Molding, melted plastic is forced into a mold
cavity. Once cooled, the mold can be removed. This plastic
molding process is commonly used in mass-production or
prototyping of a product. Injection molding machines were made
in the 1930's. This can be used to mass produce toys, kitchen
utensils, bottle caps, and cell phone stands to name a few.

2. Blow Molding

Blow molding is like injection molding except that hot liquid
plastic pours out of a barrel vertically in a molten tube. The
mold closes on it and forces it outward to conform to the inside
shape of the mold. When it is cooled, the hollow part is formed.
Examples of blow molding products are bottles, tubes and
containers.

Equipments needed in setting-up a blow molding business are
relatively higher than injection molding.

3. Compression Molding

In this type of plastic molding, a slug of hard plastic is
pressed between two heated mold halves. Compression molding
usually uses vertical presses instead of the horizontal presses
used for injection and blow molding. The parts formed are then
air-cooled. Prices of equipments used for compression molding
are moderate.

4. Film Insert Molding

This plastic molding technique imbeds an image beneath the
surface of a molded part. A material like film or fabric is
inserted into a mold. Plastic is then injected.

5. Gas Assist Molding

Also called gas injection molding is used to create plastic
parts with hollow interiors. Partial shot of plastic is then
followed by high-pressure gas to fill the mold cavity with
plastic.

6. Rotational Molding

Hollow molds packed with powdered plastic are secured to
pipe-like spokes that extend from a central hub. The molds
rotate on separate axes at once. The hub swings the whole mold
to a closed furnace room causing the powder to melt and stick to
the insides of the tools. As the molds turn slowly, the tools
move into a cooling room. Here, sprayed water causes the plastic
to harden into a hollow part. In this type of plastic molding,
tooling costs are low and piece prices are high. Cycle time
takes about 40-45 minutes.

7. Structural Foam Molding

Structural foam molding is a process of plastic molding usually
used for parts that require thicker walls than standard
injection molding. Inserting a small amount of nitrogen or
chemical blow agent into the plastic material makes the walls
thicker. Foaming happens as the melted plastic material enters
the mold cavity. A thin plastic skin forms and solidifies in the
mold wall. This type of plastic molding can be used with any
thermoplastic that can be injection molded.

8. Thermoforming

In this plastic molding process, sheets of pre-extruded rigid
plastics are horizontally heated and sucked down into hollow
one-piece tools. When the hot plastic solidifies, its shape
conforms to that of the mold.

Tooling costs are usually low and piece prices vary on the
machinery.

Plastic molding is a very technical process. It needs experts in
this type of manufacturing business for it to be competitive in
the market. Therefore, a very scientific and systematic study
should be first made before going into this endeavor.

About the author:
For more great plastic molding info and advice check out:
http://www.plastics-hq.com