Rilong Mold Co. is a Chinese mold manufacturing company with the prestige of providing high-precision plastic injection products. They have a strong workforce of 300 employees, specializing in engineering, production, and testing. Rilong offers a full range of in-house manufacturing services that can be customized to meet the client’s specific requirements. Their portfolio includes automotive parts, optical products, security cameras, and electronics.

Shenzhen Silver Basis Technology Co., Ltd. is among the leading professional plastic injection molding companies in China. They mainly focus on precision molds and offer tooling and molding services for structural parts and large precision injection molds. It has worked with global companies like Peugeot automobiles and ZTE mobile phones.

TK Mold Holdings Limited is a leading brand that has gained a reputation for offering unique plastic mold solutions to the medical and automotive sectors. Founded in 1983 in Hong Kong, TK Mold has been in the industry for over 40 years and is a professional manufacturer of plastic molds and parts for medical appliances, smart home devices, mobile phones, and precise electronics. TK Mold is a well-known brand in China and Asia, and it has achieved remarkable success; it is the first company in revenue among Chinese MT3-level suppliers, according to IPSOS, an independent marketing research company.

Richfield Plastics is a mold maker and injection molder based in Dongguan, China. It has an 18,000-square-meter factory and 250 employees. Moreover, it provides a variety of post-processing service finishing services, including spray painting, printing, assembly, packing, and labeling.

The major deviation from the plans is the temperature control. In the original design, you have to watch a dial thermometer while fiddling with a bimetal thermostat. Going with something more modern is well worth the effort.

To try it out I cut some ⅜”-wide strips of polyethylene from an old plastic tote lid, set the controller to 380°F and fed the plastic strips into the cylinder. After the cylinder is filled with sufficient molten plastic, the mold is placed under the nozzle and raised into place. (If the mold in put in place while the plastic is being loaded some of the plastic will dribble out of the nozzle and clog the sprue of the mold.)

Their plant occupies 23000 square meters and has modern equipment: high-speed milling centers from Taiwan, more than 10 Haitian injection molding machines, multi-axis like five-axis high-speed machining centers, coordinate detectors, high-precision EDM machines, material hardness detectors, and 50 CNC processing units.

The China Plastics Industry Association has ranked the top 10 plastic injection molding companies in China in 2020, based on their main business income.

For now, I’m limited to simple molds I can make with a lathe or mill, but I’m adding CNC capability to my lathe, and thinking about a CNC router. That would open all sorts of possibilities.

Sometimes there’s a tool you want to buy, but you can’t justify the cost. In that case, why not make it? For me, a plastic injection molding machine fell into that category — and it turns out they’re not hard to make.

My favorite fastener for projects is Allen head cap screws so I used #10-24 cap screws instead of 1/4-20 bolts to mount the heater block and guide block to the frame. They’re at least as strong as ungraded 1/4-20 bolts and should conduct a little less heat from the heater block to the frame.

So I built an injection molder based on the plans in Vincent R. Gingery’s book Secrets of Building a Plastic Injection Molding Machine. David Gingery could be considered a forerunner of the Maker Movement — he and his son Vincent have written a whole series of books on building tools for the machine shop.

Using the machine is easy. The book recommends making a test mold that will make two ½”-diameter pellets of plastic. These pellets are then used to feed the machine when making real parts.

I wanted to make solid plastic parts for some of my amateur science experiments. There are a number of ways to make things out of plastic, each with its advantages and disadvantages. Often just cutting raw material to the desired shape works best. Some plastics can be cast by pouring a liquid resin with hardener into a mold (see “DIY Rotocaster,” Make: Volume 41). Vacuum forming works well for making things out of thin sheets of plastic (see “Kitchen Floor Vacuum Former,” Make: Volume 11). I considered making a 3D printer, but for the few plastic parts I envisioned needing, it wasn’t worth the time and money.

Dongguan Sincere Tech Co., Ltd. has been in business for over 19 years and specializes in affordable, high-quality molds and parts. The company is among the best prime plastic injection molding companies in China. They greatly cover the needs of various industries, such as aerospace, medical, and consumer products, by providing rigorous standard quality parts services.

Silver Basis Technology provides specialized services for the automotive sector. It provides car makers with molds for large automotive interior and exterior parts, functional parts, and automobile security systems.

Richfields Plastics Ltd. was founded in 2001 as a plastic injection molding company. Over the years, it has grown to offer its clients complete solutions for their manufacturing needs, including mold manufacturing.

JMT Automotive Mold Co., Ltd. is a chief professional plastic injection molding company in China, situated in Huangyan, Zhejiang Province. Since its establishment in 2005, the company has provided its customers with standard-quality products and comprehensive services. They primarily focus on automotive molds, SMC molds, home appliance molds, and household product molds.

Here is the top list of 10 Chinese plastic injection molding companies recognized for providing rigorous quality standards to their valued customers around the world

(One modification I tried didn’t work out so well. The heater block and guide block need to be spaced out from the frame a bit, to isolate the hot heater from the frame and put the parts into proper alignment with the piston. The plans call for washers, but I tried using some leftover fiber ceramic insulation sheet instead. It was too soft — it allowed the heater block and guide block to move out of alignment, preventing the piston from operating smoothly.)

I used an inexpensive digital temperature controller (H) from Auber Instruments (auberins.com). These controllers use PID (proportional-integral-derivative) feedback control and can bring the temperature up to the exact setting quickly without any overshoot. I mounted mine in a separate enclosure and added a solid-state relay to handle the high-power heaters. A thermocouple sensor (I) comes with the controller; it screws into a tapped hole in the heater block near the nozzle (J). It is really nice to be able to set the desired temperature on the controller, turn on the heaters and watch the temperature rapidly climb to the setting.

TK Mold currently consists of five production lines: four in Shenzhen and one in Germany. The company has a large production area spread over over 200,000 square meters. Moreover, TK Mold Holding is a reputable company that covers various sectors, including telecommunication, automotive, electrical appliances, healthcare, and digital mobile devices.

The market for plastic injection molding companies in China has been growing and expanding due to the development of 3D prototype manufacturing. The market size was 36 billion yuan in 2018 and increased to 45 billion yuan in 2023, with a compound annual growth rate (CAGR) of 6%. It has risen by up to 9% over the past five years. This growth is predicted to continue, with the market projected to increase to 58 billion yuan by 2030, with a compound annual growth rate of approximately 5%.

Now I’m making test-tube caps for my science experiments. I started out by drawing a sketch for the mold in my project notebook. The test tubes are 16mm in diameter so I started with that dimension and chose arbitrary dimensions for the height of the cap and thickness of the plastic. I added a lip to the cap to make it easier to pull off.

Industry Type: Four processes commonly used in producing automotive parts are Plastic Injection Molding, Die Casting, Machining, and Surface finishing.

Jim Hannon retired recently after 39 years as an electrical engineer for Rockwell Collins. Now he can concentrate on amateur science projects and on making things in his woodworking and machine shop — especially things that are too expensive to buy, or that just don’t exist.

“We are very happy with your management & English communication, you are outstanding in issue solving and fast replier, frankly say you are  the best plastic mold maker and the molding company I have been working up to know”

I wouldn’t recommend this project for someone who has no metalworking experience. I made full use of my machine shop: mill drill, lathe, stick welder, horizontal band saw, ½” reamer, and various taps. You can get by with a drill press and various hand tools. I welded most of the assembly together but the book calls for screws, except for one weld (which you could have someone else do if you don’t have a welder).

The injection lever (D) pivots on a½”-diameter steel rod (E). I beefed this up by drilling larger holes in the frame and turning some steel bushings (F) on my lathe to support the rod. The bushings also keep the lever centered over the injection piston (G).

Plastic injection molding has been around since thermoplastics were invented. It’s a great way to make many copies of a part quickly, and what I like best is that it’s easy to reuse old plastic objects to make new ones.

All in one service for new product development from part design, PCB design, prototyping, testing, mold/die/tooling making, massive production, assembly, inspection, and packing.

Seasky Medical is a prominent manufacturer of plastic molds in China, and it specializes in the medical industry. They offer solutions in mold design, manufacturing, material selection, injection molding, and product development services.

Once the sketch is made, I’m off to the machine shop to cut some metal. Two little blocks of 6061 aluminum make up the halves of the mold. First, two 0.124″ holes are drilled through both blocks to hold guide pins that will ensure the mold halves are properly aligned. Two ⅛” guide pins are pressed into one half of the mold, and the other holes are reamed out just slightly to 0.126″. Then the parts are machined on the lathe to form the cavity for the cap. Finally a sprue hole is drilled and countersunk.

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Dongguan Runsheng Plastic Hardware Company is one of the leading companies in China’s plastic injection molding industry that focuses on mold design and assembly. Established in 2007, the company is managed by professional managers and technical personnel committed to creating high-quality, diversified products.

Focusing on different types of plastic mold, Eco Molding offers injection molding solutions for electronics, general industrial OEM products, home appliances, and automotive industries. The company also maintains high levels of transparency by providing its customers with direct factory prices, which helps to build trust and credibility.

Some of the of the prime services they offer include rapid prototyping machining, injection molding, tooling, die casting, and CNC machining. Dongguan Runsheng has a broad product portfolio, which enables clients to select solutions that meet their requirements.

Learn more: Secrets of Building a Plastic Injection Molding Machine by Vincent R. Gingery (David J. Gingery Publishing, 1997), ISBN 1-878087-19-3

Jim Hannon retired recently after 39 years as an electrical engineer for Rockwell Collins. Now he can concentrate on amateur science projects and on making things in his woodworking and machine shop — especially things that are too expensive to buy, or that just don’t exist.

HT Mould is a professional plastic injection molding company in China that was founded in 2006. They deal in plastic mold design, injection molds, and molded parts for different sectors of the economy. HT Mold is based on 450 professional employees and has offices in different regions of the globe, such as America, Russia, and Europe.

Sincere Tech is Contract mould supplier in China that offers electronic new product research and development services as well as assembly company services. Contact us for more information.

Having been in production for more than a decade and with an extra 11 years of experience from its parent company, Seasky Medical is one of the rarest companies in the medical injection molding company field, which sets it apart for providing stringent quality medical use prototypes to the healthcare industry. The company has an ISO 8 cleanroom production floor and uses 10 state-of-the-art injection molding machines and equipment to produce high-quality plastic injection molds. Seasky Medical is dedicated to providing quality standards to its clients, which has made it one of the leading companies in medical injection molding.

Dongguan Sincere Tech Co., Ltd. is a reputable mold manufacturer in China. It specializes in plastic molding and is dedicated to providing high-quality molds and excellent services to its valued customers

Transparency in Services: Customers are provided with comprehensive information about the raw materials used and the results of the tests conducted on the products, thus creating trust and openness. They also offer affordable prices within reach of any customer’s pocket.

This project should cost between $100 and $200. It depends a lot on where the metal is purchased. I had a lot of the metal already, left over from other projects. Try to find a friendly local iron dealer, rather than getting the metal online or from a hardware store. They’ll often let you pick through their cut-off pile and sell it for almost scrap prices.

Unlike some competitors, Richfields Plastics offers injection molds and plastic products to several industries, including automotive, sports, consumer products, rubber, toys, home and kitchen products, and tools.

Currently, there are many plastic injection molding companies in China that offer molded plastic chairs, baby toys, home appliances, and other consumer products at reasonable prices. When choosing a plastic injection molding company to work with, it is important to consider aspects such as the cost, reliability, durability, and functionality of the product. All of the aforementioned companies can help you bring your visions to life, so choose the one that meets your needs. If you are looking for custom on-demand manufacturing solutions from top custom plastic injection molding companies or plastic mold injection companies near me, go nowhere. Contact us to find your intended product manufacturing solution.

Eco Molding Limited is a Chinese company that specializes in the plastic injection molding business. It has been in operation for over a decade since its inception in 2008. Eco Molding has established itself as a leading custom plastic molding company that provides its services to North American and European markets with the help of hard-working employees, quality equipment, and experienced management.

Jim Hannon retired recently after 39 years as an electrical engineer for Rockwell Collins. Now he can concentrate on amateur science projects and on making things in his woodworking and machine shop — especially things that are too expensive to buy, or that just don’t exist.

The frame (C) in the Gingery design is mostly angle and flat iron held together with bolts and nuts, but two connections needed to be welded. So I decided to weld most of the frame and avoid drilling so many bolt holes.

I tried out the cap mold with some of the tote lid plastic I used for the test pellets. The caps turned out nice, but they were a bit stiff and difficult to put on. A more flexible plastic was needed. Then I made some caps with LDPE (low-density polyethylene) lids from oatmeal boxes. The caps made with the LDPE work just fine.

Being an engineer, I couldn’t resist making improvements. The plans call for a 1″×1½”×4″ piece of cold rolled steel for the heater block (A), where the plastic is heated before being injected into the mold. I used a leftover piece of 1″×2″ hot rolled steel instead. The wider block allowed me to add a second cartridge heater (B), so my machine warms up quicker and can get hotter.

Eco Molding Co. Ltd. has over, occupies an area of over 2,000 square meters, and has capital assets of over 8 million RMB. With such resources, the company has the capacity to produce 40 to 50 plastic injection molds monthly.