Mold Maker in China

There are lots of different standard mold makers in China. The most important and difficult thing is to choose the right mold maker for a company at the beginning. Sometimes it takes a long time.To find a good mold maker in China with reasonable price is really not as difficult as you think was. You should know something about the Chinese mold market.First of everything you'd better to know is what do you really want from the mold maker with your prices. To attend mold trial is kind of a right thing, a suggestion you may also follow is requesting sampling video for each trial to save your time and traveling cost. Of course there are some exceptional for some very complicated and super big molds, in the other meaning for some very expensive molds.
How Do I Narrow Down My Options?
You may have a long list of possible manufacturers at this point. To narrow it down, look for:

• Manufacturers that make products similar to yours . Ideally, you want a manufacturer that specializes in this type of product.
• Manufacturers that do most of their exporting to the U.S. or other Western countries. These Chinese manufacturers will generally have higher quality standards, and have proven they are able to meet the expectations of Western importers in terms of compliance with product safety, labeling and packaging regulations. They're also more likely to have experience with the logistics of shipping products internationally and a greater ability to get your products through the accompanying red tape.
• Come up with a shortlist of three to five possible Chinese manufacturers that you're considering. Before proceeding any further, have them sign a nondisclosure agreement specifically for overseas manufacturers.
• Once the manufacturers have agreed to nondisclosure of your idea, your next step is getting a request for quotation (RFQ). Send them images of your product prototype with details such as what materials you want to use, the size of the product, and anything else they’ll need to know in order to make the item.

In your RFQ, find out:

• Prices for Mold & Products
• Time to manufacture. How long will it take to make your order? This can make or break your choice of supplier, since you don’t want to wait too long to get your products.
• Payment terms. How and when does the manufacturer expect to be paid? As a new customer, be aware that you might have to pay the entire amount of your first order upfront. Be sure to ask about future payment terms if you become a regular customer.

Be sure you get the same information from each Chinese manufacturer so you're making a straight comparison of what they offer.
Do I Need to Visit the Factory in Person?
Unless you're placing a very large, complicated order, it shouldn’t be necessary. If you're at all concerned that the company is not legitimate, you can tell them that you will conduct a factory inspection before sealing the deal. Fraudulent companies will be scared off by this tactic, while legitimate ones will welcome it.
Jingwei molding has more than 15 years experience in plastic injection molding and mold making. Your High Volume, Custom Plastic Parts Injection Molding Specialist. To learn more about our manufacturing capabilities and discover what makes us different, please visit our website: :jweimolding.com . If you’re ready to jump into your next project with us, request a quote . No matter your need,contact us today so we can help your business face all of the changes and challenges of today’s competitive marketplace.

Turning Your Ideas Into Reality:Custom Plastic Injection Molding

Look around you. There’s a huge chance a lot of the things you see around you are made of plastic. This fact does not even come as a surprise, knowing that plastic can be molded into so many different things.
With the right materials and the expertise of a trusted plastic injection molding service, you can turn that product idea into something real.
Why is plastic the top choice when creating a new product?
For one thing, plastic is extremely versatile, with a number of different ways to mix and match the base elements with additives to come up with the perfect product. Do you need something durable with a smooth finish? Or would you perhaps prefer something softer, something more manageable? Regardless of what your needs are, there will always be a way to attain the results you want.
Production costs are also low when it comes to plastic. They are great electrical insulators, are resistant to corrosion, and when used the right way, can be easily recycled. Without a doubt, plastic is one of the best materials you can use if you’ve come up with a brilliant idea for a product.
How Custom Plastic Injection Molding Works
Because your product idea would probably work best using plastic as your main material, the next thing you should be looking into is finding out how the entire process works.
How can you turn your idea into a real plastic product? That’s what custom injection molding is for.
Basically, the plastic material is fed into the part of the machine called a hopper, which then pushes it into the extruder. From here, the material is pushed further into the heating chamber, where the plastic is melted.
Now that the plastic is in melted form, it’s time to mold it into the shape of the custom plastic parts you need.
The molten plastic is pushed into a closed cold mold using extreme amounts of pressure. Without the right pressure, the mold will not be filled, and the plastic will not take the shape you want. Basically, it’s the mold that serves as a guide or pattern. It forms the shape of the plastic.
Once the plastic has cooled and solidified, it is ejected from the chamber. And from here, you can see that the finished product now takes the shape it was meant to take.
From here, some finishing work may still be done. Some plastic parts require painting, for example, while some may need a finer finish, which means that any excess plastic parts may have to be shaved off.

With the right kind of manufacturer and the right idea, you can create something wonderful and change the course of mankind.

Jingwei molding has more than 15 years experience in plastic injection molding and mold making. Your High Volume, Custom Plastic Parts Injection Molding Specialist. To learn more about our manufacturing capabilities and discover what makes us different, please visit our website: :jweimolding.com . If you're ready to jump into your next project with us, request a quote . No matter your need, contact us today so we can help your business face all of the changes and challenges of today's competitive marketplace.

The 11 Most Common Plastics & Their Applications

One of the major innovations of the past century has been the introduction and wide adoption of plastics for many day-to-day applications that previously relied on traditional materials like metal, glass, or cotton. Plastics have revolutionized many industries for a number of different reasons to include the fact that they resist environmental degradation over time, are generally safe for human beings, are economical and widely available, and are produced with a wide variety of material properties that allow adaptation to many different applications. Here is our list of the top 11 plastics the modern world simply cannot do without:

1. Polyethylene terephthalate (PETE or PET):

PET is the most widely produced plastic in the world. It is used predominantly as a fiber (known by the trade name “polyester”) and for bottling or packaging. For example, PET is the plastic used for bottled water and is highly recyclable.
Three words or short phrases to describe the major benefits of Polyethylene relative to other plastics and materials would be:
Wide applications as a fiber (“polyester”)
Extremely effective moisture barrier
Shatterproof
2,Acetal (Polyoxymethylene, POM):
Acetal is a very high tensile strength plastic with significant creep resistant properties that bridge the material properties gap between most plastics and metals. It is known for high resistance to heat, abrasion, water, and chemical compounds. Additionally, Acetal has a particularly low coefficient of friction which combined with its other characteristics makes it very useful for applications that utilize gears.
Two words or short phrases to describe the major benefits of Acrylic relative to other plastics and materials would be:
Transparent
Scratch Resistant
3,Polyvinyl Chloride (PVC):

Polyvinyl Chloride is perhaps most well known for its use in residential and commercial property construction applications. Different types of PVC are used for plumbing, insulation of electrical wires, and “vinyl” siding. In the construction business PVC pipe is often referred to by the term “schedule 40” which indicates the thickness of the pipe relative to its length.
Three words or short phrases to describe the major benefits of PVC relative to other plastics and materials would be:
Brittle
Rigid (although different PVC variants are actually designed to be very flexible)
Strong
4,Polypropylene (PP):
Polypropylene is used in a variety of applications to include packaging for consumer products, plastic parts for the automotive industry, special devices like living hinges, and textiles. It is semi-transparent, has a low-friction surface, doesn’t react well with liquids, is easily repaired from damage and has good electrical resistance (i.e. it is a good electrical insulator). Perhaps most importantly, polypropylene is adaptable to a variety of manufacturing techniques which makes it one of the most commonly produced and highly demanded plastics on the market.
Two short phrases to describe the major benefits of Polypropylene relative to other plastics and materials would be:
Unique Use For Living Hinges
Simple To Manufacture
5,Polystyrene (PS):
Polystyrene is used widely in packaging under the trade name “styrofoam.” It is also available as a naturally transparent solid commonly used for consumer products like soft drink lids or medical devices like test tubes or petri dishes.
One short phrase to describe the major benefits of Polystyrene relative to other plastics and materials would be:
Foam Applications
6,Polyethylene (PE):
There are a number of different variants of polyethylene. Low and high density polyethylene (LDPE and HDPE respectively) are the two most common and the material properties vary across the different variants.
LDPE: LDPE is the plastic used for plastic bags in grocery stores. It has high ductility but low tensile strength.
HDPE: A stiff plastic used for more robust plastic packaging like laundry detergent containers as well as for construction applications or trash bins.
UHMW: Extremely strong plastic that can rival or even exceed steel in strength and is used is for applications like medical devices (e.g. artificial hips).
7,Polycarbonate (PC):
Polycarbonate is a transparent material known for its particularly high impact strength relative to other plastics. It is used in greenhouses where high transmissivity and high strength are both required or in riot gear for police.
Two words or short phrases to describe the major benefits of Polycarbonate relative to other plastics and materials would be:
Transparent
High Strength
8,Acrylic (PMMA):
Acrylic is best known for its use in optical devices. It is extremely transparent, scratch resistant, and much less susceptible to damaging human skin or eye tissue if it fails (e.g. shatters) in close proximity to sensitive tissue.
Two words or short phrases to describe the major benefits of Acrylic relative to other plastics and materials would be:
Transparent
Scratch Resistant
9,ABS (Acrylonitrile Butadiene Styrene):
ABS has a strong resistance to corrosive chemicals and physical impacts. It is very easy to machine, is readily available and has a low melting temperature making it particularly simple to use in injection molding manufacturing processes or 3D printing.
Four short phrases to describe the major benefits of ABS relative to other plastics and materials would be:
Impact Resistant
Readily Available
Simple To Manufacture
10,Acetal (Polyoxymethylene, POM):
Acetal is a very high tensile strength plastic with significant creep resistant properties that bridge the material properties gap between most plastics and metals. It is known for high resistance to heat, abrasion, water, and chemical compounds. Additionally, Acetal has a particularly low coefficient of friction which combined with its other characteristics makes it very useful for applications that utilize gears.
Two short phrases to describe the major benefits of Nylon relative to other plastics and materials would be:
High Strength
Temperature Resistant
11,Polylactic Acid (PLA):
Polylactic Acid is unique in relation to the other plastics on this list in that it is derived from biomass rather than petroleum. Accordingly it biodegrades much quicker than traditional plastic materials.
Two words or short phrases to describe the major benefits of Polylactic Acid relative to other plastics and materials would be:
Biodegradable
DIY 3D Printing (compare PLA to ABS)

No matter what the application is there are different plastics with the right material properties to suit the requirements.Jingwei molding has more than 15 years experience in plastic injection molding and mold making. Your High Volume, Custom Plastic Parts Injection Molding Specialist. To learn more about our manufacturing capabilities and discover what makes us different, please visit our website: :jweimolding.com . If you're ready to jump into your next project with us, request a quote . No matter your need, contact us today so we can help your business face all of the changes and challenges of today's competitive marketplace.

What you should be considered when making a final resin selection

Choosing the appropriate material for plastic injection molding part production is critical. There are approximately 85,000+ thermoplastics available in the marketplace. Within the vast material options available, there are approximately 40 polymer blends or families.

A variety of attributes should be considered when making a final resin selection such as:
• Chemical Resistance-Should the strength of the material protect against chemical or solvent reaction?
• Tensile Strength-What is the resistance of the material to breaking under tension?
• Durability-What is the material’s ability to withstand pressure, damage or wear?
• Flexibility-Can the material bend without breaking?
• Temperature Resistance-Will the product be exposed to high or low temperatures? How will it react to other factors or materials in the manufacturing process?
• Aging-Is there a shelf life required for the material?
• Impact Resistance-What is the ability of the material to withstand a high force or shock applied to it over a short period of time?
• Environment-Will outside factors impact the product such as weather, chemicals, or other conditions?
• Overmolding-Working with two independent materials, how and
will the two materials interact with each other in the manufacturing
process?
• Material Cost-Will you select a premium or equivalent grade material?
• Product Availability-What is the lead time (availability) of the material?

Jingwei molding has more than 15 years experience in plastic injection molding and mold making. Your High Volume, Custom Plastic Parts Injection Molding Specialist. To learn more about our manufacturing capabilities and discover what makes us different, please visit our website: :jweimolding.com . If you're ready to jump into your next project with us, request a quote . No matter your need, contact us today so we can help your business face all of the changes and challenges of today's competitive marketplace.

Basics Of Injection Molding

Injection molding is a manufacturing process commonly used for fabricating items from plastic case and toys to automotive body parts, cell phone cases, water bottles, and containers. Essentially many of the plastic parts that we use in every-day life are injection molded. It is a quick process to create a mass amount of identical plastic parts. The flexibility in shape and size achievable by the use of injection molding has consistently widened the boundaries of design in plastics and allowed substantial alternatives of traditional materials due to design freedom and light weighting.

How does it work?
An injection machine is made up of three primary components – the feed hopper, the screw and the heated barrel. Plastic granules for the part are fed into the heated barrel by a hopper. Plastic that is placed in the hopper is usually in powder or granular form although some resins, for instance silicone rubber, may be a liquid and might not entail heating. The material is then melted utilizing the frictional action of a reciprocating screw accompanied with heater bands. The molten plastic is then injected through the nozzle and into a mold cavity – it may seem easy, but injection molding is actually a very complex process. While in the mold cavity, the material cools and solidifies to the configuration of the cavity. When the part has hardened, the moveable platen that the mold is mounted opens and the part is ejected using ejector pins.
Injection molding machine sizes can run anywhere from 5 tons of clamping force to over 6000. The higher the tonnage, the larger the machine. In fact, injection molding machines are classified based on tonnage, or more precisely the clamping force or pressure.
For example, a machine that is capable of delivering 80 tons of clamping pressure is rated for 80 tons. This pressure ensures that the mold remains closed during the injection process. Too little or too much pressure can cause part quality issues as well as flashing, where excess material surfaces on the edge of the part. The viscosity of the plastic being used is also impacted by pressure. MFI or Melt Flow Index is a measure of the melt of a thermoplastic polymers ease of flow.
Another factor in sizing the correct machine is shot size and mold dimensions.
The clamping unit’s main function is to close and open the mold as well as ejecting the parts. Two of the most common types of clamps are the toggle clamps and the hydraulic clamps. Toggle clamps are traversed by hydraulic cylinders. These clamps use mechanical connections to generate greater forces than a hydraulic cylinder of the same size that uses a direct connection.
While the fundamentals of injection molding remain somewhat constant, the more technology we introduce into the existing clamp and injection processes the more complex the considerations become when developing a mold or building a machine for injection molding.

Jingwei molding has more than 15 years experience in plastic injection molding and mold making. Your High Volume, Custom Plastic Parts Injection Molding Specialist. To learn more about our manufacturing capabilities and discover what makes us different, please visit our website: :jweimolding.com . If you're ready to jump into your next project with us, request a quote . No matter your need, contact us today so we can help your business face all of the changes and challenges of today's competitive marketplace.

The necessity of drying plastics resin

Moisture affects the quality of the molded part in different ways, and the extent is determined by either the specific resin being processed or the purpose of the part. Improper or incomplete drying can create problems, either when the part is being processed or when the product is in use, or sometimes, both.
Drying plastics resin is done to reduce or eliminate problems caused by too much or too little moisture in plastic material as it is being processed. Most processors accept the need to pre-dry plastic resins, particularly hygroscopic resins, but many don’t understand the basics of resin drying.
There are 4 fundamental drying parameters for all polymers:
Heat
The first fundamental drying parameter is heat. The pellet will not release its moisture if you don’t heat it. Hygroscopic polymers are strongly attracted to water. The water molecules are bound to the polymer chains. Heat weakens the forces bonding the water molecules to the polymer chains, causing the molecules to move powerfully. If the temperature is high enough, the force binding the molecules to the chains are reduced, which allows for free movement of the water molecules to move the drying process along.
Dew point
The second fundamental drying parameter is dew point. Dew point is the temperature at which the air condenses. When the pellet is surrounded by the low vapor pressure of the dry air, it causes freed moisture molecules to move to the surface of the pellet.
Drying time
The third fundamental drying parameter is drying time. Plastic pellets do not dry immediately. First, they must be heated to let water molecules move freely, then enough time must pass for the molecules to de-fuse to the hygroscopic pellet surface.
Airflow
The fourth fundamental drying parameter is airflow, which carries heat or dry heated air to the material in the drying hopper. There must be a low dew point heated air forced over the material in order for the molecules of moisture to be detached from the chains and moved to the pellet surface where the airflow will carry the moisture away. Dry air volume must be sufficient enough to develop and maintain the desired temperature profile in the hopper.
To prevent defects, drying must be done properly in the molding or extrusion process. You can increase and optimize the molding times and extrusion rates by uniform drying to a low, consistent moisture level, maintaining a constant temperature, keeping the drying system in working condition, and using dryers that offer the latest drying technology to avoid temperature or point spikes, or any other issues that could arise.

ingwei molding has more than 15 years experience in plastic injection molding and mold making. Your High Volume, Custom Plastic Parts Injection Molding Specialist. To learn more about our manufacturing capabilities and discover what makes us different, please visit our website: :jweimolding.com . If you're ready to jump into your next project with us, request a quote . No matter your need, contact us today so we can help your business face all of the changes and challenges of today's competitive marketplace.