Richfields is able to utilize mold flow analysis programs to ensure that potential processing problems are highlighted at an early stage just before we start manufacturing our plastic tools and molds. If you would like mold flow analysis of your tools please inquire in advance because additional charges may apply. Our equipment, processes and years of experience make our plastic tool and mold manufacturing division a very professional, well-oriented, highly precise factory in China. Some of our strengths include:


Gas Assist Injection Molding is the process in injection molding wherein nitrogen gas is injected through controlled high pressure into the tool during the injection process. Richfields usually uses this process for plastic parts that are considered bigger or thinner than usual, under industry standards. There are a number of benefits to using Gas Assisted Injection Molding process. These include, but are not limited to:

Better part quality

Faster mold production cycle time

Improved surface texture

Reduced usage of plastic materials

Savings on expenses

The result is a more sustainable production process due to less stress, wear and tear on the tool. Surface texture is improved because with Gas Assisted Injection Molding, sink marks are eliminated. Contact Us today to know how you can increase production output and save on production costs!


Insert or over molding is used when the design of your products needs to combine materials with different specifications into one finished product. It is used when a single shot is not enough for the complexity of the product. The finished product of an insert molded or over molded part is a single piece with plastic molded around the insert. This is done by incorporating the insert into a tool and then over-molded to form the final part. The insert used in over molding is usually made of metal or plastic. Richfields can do insert over molding for customers who require it in the application of Specialized plastic or metal Inserts and threaded inserts. This technology is actually very cost effective, since it lessens future assembly costs. With the benefits of insert over molding, it has become popular in the market over the years.

Note that not all designs of plastic parts are readily manufactured using over molding, and insert over molding requires more diligence, expertise and experience from the mold makers. We at Richfields have been trained to help you resolve above-standard, complicated and large over-molded parts. We would be glad to assist you from product design up to manufacturing feasibility of your products, making sure your products are manufactured according to their intended use. For a quote, please do not hesitate to Contact Us.


Richfields has a rich experience in working with customers who require injection molds for rubber products. We have worked with materials such as TPE and TPV. We can supply rubber parts for consumer, FDA, and industrial applications. We create more value to our customers by providing production flexibility and the necessary diligence and responsiveness. This way, efficient production costs are kept at a minimum. Our engineering and production teams will assist you in resolving all tooling and production concerns. Contact Us for your requirements in custom and standard molded rubber parts today! We look forward to receiving your inquiries and we shall respond within 48 hours.


Richfields Corporation uses decades of experience in manufacturing unscrewing plastic injection molds. The output is molds that are used for the production of internal threaded plastic injection parts. External threaded plastic injection do no need to be produced using unscrewing injection molds.

Detailed threads on the plastic parts cannot be easily removed from the mold using traditional knock-off, so unscrewing plastic molds have gained popularity not only for its quality but also as a means for cost savings. Unscrewing plastic injection molds can be more complex in design than most plastic injection molds

The molds are operated at high speed to realize faster cycle times. To prevent damaging the threads on the plastic part during production, unscrewing plastic injection molds are being used by the industry.

Unscrewing is widely used for plastic parts that require high volume of output during production. It also prevents damaging the threads on the plastic parts during production. We make unscrewing plastic injection molds to produce high quality parts such as:

Automobile Industry parts

Bolts and Nuts

Bottle caps and closures

Cosmetics containers

Consumer products packaging


Medical supplie

Personal care products

To know more on other industries served by the plastic injection molds constructed by Richfields, please visit our Industries page.


Richfields Corporation has designed and built - also repaired - plastic injection molds that use hot runner system for years. Our skill in manufacturing hot runner molds has been very important to our customers.

Hot Runner is usually used for production with high volume, and also with multi-cavity molds. This is so because many benefits are realized when using hot runner molds. Listed below are just some of them:

Clamping Pressure can be lower

Cooling time is faster

Cycle time is faster

Energy consumption lowered

Injection gates are on better locations

Injection Pressure can be lower

Injection process is cleaner

Labor costs for removing the part from the mold and separating runner scrap from the part are eliminated

Output increased

Overall profitability increased

Possibility of contamination is lessened with no runners

Possibility of producing the parts using smaller injection machines

Problems on nozzle freeze or sprue sticking are eliminated

Production costs are reduced

Production steps are shortened

Quality of the plastic part is better

Regrinding is eliminated

Resin costs are lowered

Runner scrap eliminated or reduced

Runner weight reduces shot size

When you are ready to use a hot runner mold, feel free to Contact Us. Based on experience, our customers would sometimes require a specific brand of hot runner system. We are flexible in this regard and can accommodate the brand of hot runner that will be specified by our customer. Some brands of hot runners that we are familiar with include:



Mold Masters




Richfields Corporation has both the skill and experience in producing plastic parts using cold runner molds. Cold Runner Molds has been used in the plastic industry for a long time now. They are typically less complicated to work with.

Cold runner molds usually uses more material during production, though. This is because in every molding cycle, a plastic part and a runner is produced.

The runner is made of excess plastic material present in every shot. The excess material is removed and may be disposed of or reprocessed. Consequently, the processing time is usually longer. There are also side effects to using reprocessed plastic materials.

The use of cold runner molds is still common in the plastic industry despite possible disadvantages mentioned above. That is because:

Changing color of plastic material is usually easier with cold runner molds.

Cold Runner Molds provides more cost savings in mold maintenance as well mold production.

Designs of cold runner molds are less complicated.

It is relatively easier to operate with cold runner molds.


Richfields Corporation has an extensive knowledge in the precision plastic injection molding industry. Modern equipment, decades of professional plastic experience, and strategic location are just a few variables in the success formula we provide our customers.

Our specialty in precision plastic injection molds comes from the internal strengths of Richfields in mold making. Our attention to detail makes our company stand out when it comes to precision plastic molds requirements of our customers worldwide.

Our company's all-in-one-roof plastic injection mold making and plastic injection molding Equipments helps our customers realize their paybacks sooner. Our engineers provide clients with complete precision plastic molding solution from 3D modeling of the product to mold layout designing to production, secondary processing, assembly, and packaging of finished products. Please take some time to learn more about our complete Products & Services. Best of all, we support OEM!

We can accomplish tight tolerances depending on customer specifications and the plastic raw material to be used. We meet tolerances of +/- .002" and this can be made more precise for ABS material - up to +/- .001" Contact Us today so we can help you decide what plastic raw material will best suit your product requirements!

Richfields is a custom injection mold making company that is your solution to plastic injection molding of precise plastic parts that require exact dimensions. These parts are commonly used in the automobile , electronics, medical and laboratory industries. Click here to see other industries served by Richfields


Family Plastic Injection Molds is another cost-efficient solution to today's manufacturers who are seeking to improve their production productivity output without having to sacrifice quality. This is made possible by designing the injection tool so that one mold contains different parts of a product.

The family mold is a kind of multi-cavity mold where each cavity produces different parts of the same product. The parts produced by the different cavities may also be unrelated, they can belong to the same product line or to the same project.

Another reason to use family molds is when the production quantity is not very high in volume. This way, our customers can manufacture more than one part in one production cycle since two or more parts are produced in every shot.

When the different component parts of a product are produced using the same raw plastic material, then all the more reason to use family molds. Not only do you save on expenses in having an additional mold base, you also save on production hours! Time is saved from repetitive mold set up and multiple production cycles.

Richfields' plastic injection molding facilities are equipped to separate the different parts post production. Our production capacity versatility helps customers realize many benefits that not only save on monetary costs but also time and effort.

Contact Us today to get a quote and learn how we can help your company save!


Richfields Plastics provides cost efficient and high quality plastic injection tooling services. Providing Plastic Mold Design services is part of our commitment to fulfill our customer’s requirements through comprehensive plastic injection tooling and molding services. Our designers and engineers work closely together with customer to fully understand detailed customer requirements.

Richfields’ strict quality procedure ensures that molds produced by our team are machined and built only according to customer instructions. One key advantage of Richfields is that we are also injection molders. Our engineers make sure that molds are designed, and subsequently built, in accordance with reasonable manufacturability parameters.

We understand our customers best because we know how to design the molds such that it doesn’t create sink marks or other unwanted cosmetic flaws based on customer requirements, and also such that the plastic parts are cost efficient to manufacture.

Richfields also does Moldflow Analysis before any of our mold designs are submitted for customer confirmation. Moldflow Analysis is able to capture possible problems that the manufacturer will encounter if the mold is built as designed. From the analysis, we are able to identify problems before they even come up. From there, we improve on our design and re-design the mold until the best/most reasonable mold design layout is achieved.


With a team of injection molding experts headed by professional team leaders who have more than 20 years of experience in the plastic injection industry, it should be fairly easy to make the decision of hiring Richfields to be your plastic injection mold repair service provider in China.

We provide the following services for new and existing plastic injection molds:

Maintenance work for the molds

Manufacture new molds

Mold re-design for better production output and cost savings

Mold re-design to include design or functionality changes made on the product or engineering changes on the plastic mold

Mold Refurbishment services to produce better parts

Repair works for tools that were damaged during production or during transit


Foam Injection is another cost efficient injection molding process employed by Richfields. Foam is added to the plastic raw material that will be used for production. This mixed compound of foam and plastic material is then injected into the cavity, to be used in the molding of the plastic parts. Aside from cost savings, other advantages of foam injection include:

Better dimension stability

Faster production cycle time

Low back pressure

Prevention of sink marks

Reduced part weight

Stronger weld line

Sturdier parts

Thicker parts

Contact Us and we shall be glad to discuss with you if your products are suitable to be used with foam injection.

Richfields is a leader and innovator in manufacturing turnkey precision plastic products. Our secondary processes for plastic parts involve cost effective yet sophisticated manufacturing systems and techniques such as: Spray Painting, Pad Printing, Hot Stamping, Electro plating, Silk Screen and Ultrasonic Welding.

Spray Painting & Pad Printing :


Richfield's spray painting and pad printing lines are comprised of engineering personnel focused on creating applications that utilize process technologies such as tunnel conveyors and oven systems, multi-color painting and printing including two color effects. The main objective of our painting technology is reducing total product costs by utilizing state-of-the-art processing technologies making it possible to spray and cure parts in a single operation.

Pad printing is an offset process where an engraved plate is coated with ink, squeezed, which leaves wet ink on the plate in the engraved pattern. A silicone pad is then pressed onto the plate and rises with the inked image. The inked pad then descends onto the component and imprints the image. Because the pad is pliable, it forms around irregular surfaces, such as cylindrical containers or round objects.

Our equipment consist of 2 line tunnel conveyors, 10 spray paint chambers, 12 screen printing tables and 6 pad printing machines.

Silk Screen:


Silk screen printing is perhaps the most traditional printing method. It involves creating an aluminum fixture and screen where the area to be painted is cut out. The screen is then swiped with paint leaving paint only in the areas void of the aluminum screen. This is the least expensive out of all the painting methods in China.

Hot Stamping :


Hot stamping is comprised of a dry printing process that transfers pigment or metallic material from a continuous film carrier sheet to a component. Heat and pressure of hot stamping permanently transfers the image into the plastic. Silicone rubber dies conforms to fit the slightly uneven surfaces typically found in molded parts and this allows for excellent resolution and repeatability. This process is clean, dry, fast and free from the manufacturing limitations associated with wet ink printing. Hot stamping is often used in series with pad printing.

As your manufacturing partner, we will invest the time and effort to make sure that you have the best quality for your product. Richfields currently has six hot stamping machines to be able to service your high volume requirements.



Electroplating is a chemical process comprised of coating metals on plastic parts to provide a metallic look on your product. Richfields has extensive experience in the electro-plating of plastics, and are one of the few companies in China to commercially electro-plate plastics in a variety of metal finishes. Technology advancements and extensive expertise enable us to offer superior service of high quality finishes to meet almost all specifications.

Ultrasonic Welding:


Ultrasonic welding of plastic parts requires a CNC machined fixture to hold the two plastic parts tightly together. Once the parts are in the fixture the ultrasonic welding machine vibrates at a very high frequency transmitting a great deal of energy into the area where the two plastic parts are joined. The energy is so great that the two plastic parts melt and fuse together in the area they are joined. Ultrasonic welding provides a secure, cosmetically appealing way to join two plastic parts.


Richfields China manufacturing facility provides assembly services of plastic and metal mechanical assemblies for its finished plastic products. Richfields can also source other mechanical and metal components to provide finished mechanical assembly services for your plastic injection molded parts.

We currently provide assembly services for plastic and metal mechanical assemblies in the industrial lighting, recreation, consumer retail, pet products and hi-tech electronics fields. Richfields also provides assembly services of basic electrical circuit boards into its products.

Richfields is consistently expanding its capabilities and services. Working with our customers on new product applications and emerging technologies, Richfields assembly services are able to keep our business portfolio growing and welcome any challenge you may have.

Custom packaging of plastic injection molded parts and mechanical assemblies are a requirement of many of Richfields customers. Provided with sketches or drawings from customers we are able to design and manufacture custom packaging for customers. This packaging includes blister packaging, custom color boxes, custom foam inserts, shrink wrapping, and individual bagging.

If you have custom packaging requirements please let our quoting department know in advance. Depending on the packaging requirements, custom packaging can affect final unit pricing greatly. Knowledge of custom packaging requirements on the initial design stages of a product will prevent misunderstandings in the future.


Mega Edge

Product Features:

- Four in pack

- Cushions sharp corners and furnitures

- Adhesives included


Mega Stop

Product Features:

- Two in pack

- Helps prevent children from accidentally locking themselves

- Helps prevent doors from slamming shut and hurting fingers


Mega Strap

Product Features:

- Two in pack

- Secures cabinet and furniture doors with a strap

- Adhesives included


Mega Mega Wind

Product Features:

- Two in pack

- Winds up excess cords of window blinds

- Easy to use


Mega Hook

Product Features:

- One in pack

- Carries up to 6 KG of weight

- Easy to install and use


Mega Hook

Product Features:

- One in pack

- Carries up to 10 KG of weight

- Easy to install and use


Mini Hook

Product Features:

- Eight in pack

- Strong bond

- Easy to install and use


Mega Hold

Product Features:

- Two in pack

- Helps redistribute weight of heavy plastic bags

- Easy to use