Plastic injection molding, as you might already know, is a quick and efficient way of mass-producing plastic products such as food containers, furniture, retail packaging for beauty products, and toys. It is very likely that any common plastic object you come across is a product of this manufacturing process. A molded part is created by injecting molten plastic at high speed and pressure into a metal mold and letting it cool and solidify to take on the shape of the mold.
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If you’re looking to buy plastic injection moldings, you must first understand that this kind of purchase requires a deeper involvement in the process. For example, if you are sourcing a particularly complex molded part, you might need to be involved in its design. There are numerous design decisions you need to take as these will determine your plastic injection molding price and quality. Taking informed decisions early on is critical as it will help you find and fix potential problems.
The process of buying a custom plastic injection molding starts with you, the buyer, providing the supplier with detailed 2D drawings showing material type, surface finish, tolerances (the accepted amount of dimensional deviation) and any specific critical dimensions along with a 3D design file of the part. If you go through a sourcing agent such as Sourcing Allies, we will act as the go-between. Most suppliers prefer 3D files in the STEP or IGES formats, which are the most widely accepted. Your initial design might need some tweaks and improvements, which can be made in collaboration with your supplier and sourcing agent.
One point to remember when buying plastic injection moldings from China or anywhere else is to be very specific about your requirements – in terms of plastic injection molding price, quality, lead time and so on – to your supplier and preferably to put it all in writing.
A key decision a buyer must make pre-purchase is selecting the right plastic raw material. After all, the strength, durability, flexibility, functionality, appearance, and cost of the part all hinge on this choice. Given that there are more than 85,000 varieties of plastics out there, this isn’t an easy choice to make. But you can start by familiarizing yourself with the most popular plastics used in plastic injection molding and their properties:
Remember, material selection doesn’t end with picking the right plastic. As a buyer, you must be aware of the right molding conditions for your material and product. This includes injection temperature and pressure, mold temperature, ejection temperature, cooling time and cycle time. Given that plastic injection molded parts are getting more intricate by the day, it is also important to be aware of draft angles and undercuts (more on these in the next section). Naturally, all these decisions must be taken early to avoid delays, additional expenses, and stress mid- and post-production.
1. Non-uniform walls: If your part has walls of varying thickness, the thinner sections will cool before the thicker ones. This will cause shrinkage and warpage in the thick sections. Walls with uniform thickness not only allow uniform cooling, they also ensure that the plastic flows and fills the mold cavity precisely. If you cannot avoid non-uniform walls due to design limitations, keep the variations as gradual as possible.
2. Thin versus thick walls: Apart from uniform wall thickness, the buyer must also consider the maximum wall thickness for a particular part. Thin walls mean a shorter cycle and lower production cost. Material selection plays a part here, so check with your supplier on the thickness specifications of the materials you are considering. As a general rule, thinner walls call for plastics that flow easily. Additionally, if your mold design requires a longer flow route, then thicker walls are more suitable.
3. Lack of drafts: A draft is a slight angle on the wall of a mold cavity so that its opening is wider than its base. This facilitates easy removal of the part from the mold. Without draft angles, a part can be damaged during ejection. Sometimes, even the mold might be damaged. The absence of draft angles might also result in the part warping or breaking due to stresses caused by cooling or ending up with a poor finish. Ideal draft angles vary from part to part, so make sure to consult your supplier on this. Overlooking draft angles during the design stage is a common mistake, one that should be avoided at all costs.
4. Sharp corners: When molten plastic flows across a sharp corner, it can cause stress formation in the material, leading to warpage and a defective product. Rounding off corners takes care of this problem by ensuring the material flows evenly in the mold cavity. However, stress concentrations vary with radius. Ensure your design incorporates uniform wall thickness with consistent inner and outer radii.
5. Parting line placement: The parting line is the line of separation on the molded part where the two mold halves meet. Its placement is a challenge in any manufacturing process. You’d like it to be as inconspicuous as possible for aesthetic reasons, but without compromising on the part’s functionality. The placement of the parting line requires your full attention because molten plastic tends to flow towards the parting line, which can cause flashes. Additionally, parting line placement impacts mold-making and post-processing costs.
6. Too many undercuts: Undercuts are protrusions or depressions on a molded part that prevent it from sliding out of the mold. They are often used in complicated parts, such as medical equipment components, and in complex molding processes such as overmolding and insert molding. Undercuts add to cost, so they should be used sparingly or eliminated altogether.
It is impossible to talk about plastics without talking about its impact on the environment. But as we grow into a more environmentally conscious society, the plastic injection molding industry is doing the same. Here’s how:
In terms of application, plastic can sometimes be a more environment friendly choice than other material. When used as an alternative to steel in aircraft components, it reduces fuel consumption because of its lower weight. Similarly, when used as insulation material in buildings, it aids in energy conservation.
Sourcing Allies is a team of expert China sourcing agents that has helped western customers manufacture and source products from low-cost regions since .
Vietnam’s long coastline and numerous coastal ports provide great convenience for commodity import and export trade. Until , Vietnam ran a chronic deficit in merchandise trade.
In , Vietnam achieved its first trade surplus in 20 years and recorded a surplus every year except . Its main export products gradually shifted from agricultural products and raw materials to machinery equipment and textiles and garments, and its international trade scale has entered the top 30 of the global economy. As of , China, the United States and South Korea are Vietnam’s top three trading partners.
Since the implementation of reform and opening-up in , Vietnam has gradually opened up its market, relaxed the proportion of foreign ownership, actively encouraged foreign strategic investment, and gradually developed its industry.
In , after joining the World Trade Organization, Vietnam attracted a large number of overseas capital to invest in the processing and manufacturing industry due to its preferential policies and sufficient labor resources, and quickly became the emerging manufacturing center of consumer electronics, textiles and garments in Asia and even the world.
Are you looking for the right injection mold supplier in Vietnam? We have compiled the top 10 injection molding suppliers in Vietnam list for you to pick as below:
Location: Hanoi, Vietnam
Company type: Manufacturing
Year founded:
The number of employees: 200-299
Main Products: Plastic injection molds, aluminum die casting, magnesium die casting, moldings for 2-color injection machines, Product and assembly of plastic injection moldings of 1-color & 2-color injection machines from 50Ton – Ton
HTMP Company was established in , with more than 15 years of construction and development, HTMP Vietnam is currently one of the leading enterprises in technology, production system and management in Vietnam and has a strong brand name. brand in the international market in the field of manufacturing precision plastic injection molds and components.
With the motto of constantly learning, continuously innovating and creating, with a team of enthusiastic, highly qualified and experienced staff, HTMP Vietnam contributes to creating high quality products to meet development requirements. development of Vietnam and the world.
HTMP Vietnam is proud to be a reliable partner in the field of supporting industries, participating in the global value chain, supplying products to many reputable large corporations in Vietnam and internationally.
The production system complies with international ISO standards (ISO-, ISO-, IATF..), the production process is closed and automatic, creating high-quality finished products, meeting all requirements of cutomer.
Location: Ho Chi Minh City, Vietnam
Company type: Manufacturing
Year founded:
The number of employees: 200-299
Main Services: Meical Device Manufacturing, Electrical/Electronic, Plastics, Tooling, Assemblies, Logistics
East West Manufacturing’s five-factory complex in Vietnam is their largest global operation, specializing in high volume, low mix production. They offer the flexibility to accommodate New Product Introduction (NPI), complete box builds and full production runs. Their team in Vietnam brings high-quality expertise and reliability to a full range of manufacturing services.
East West offers surface mount technology (SMT) capabilities through their electronics manufacturing services (EMS) division. Their complex in Vietnam has a scalable state-of-the-art lead-free facility to manufacture printed circuit boards and complete box build assemblies. Their five-building complex in Vietnam is ISO :, ISO :, and ISO certified.
Located in their own facility outside of Ho Chi Minh City, Vietnam, the completely modern tool shop occupies 4,500 square feet. From simple single cavity to complex multiple cavity, slides, gates, and injector pin designed molds.
East West has the technical skills and equipment to manufacture precision molds for their customers. The Tool Shop manufactures mechanical parts, injection mold spare parts, injection molding tools and blow molding tools.
Location: Hanoi, Vietnam
Company type: Manufacturing
Year founded:
The number of employees: 200-299
Main Services: Ammo Cans, Casting, Injection Molding, Precision Engineering
VMF is reshaping the traditional supply chains of the manufacturing industry by bringing the vast network of Vietnam factories to the customer under a single platform.
They carry a mission to break all barriers between international businesses and local factories, by providing a one-stop service for tailored sourcing, project management, logistics management and supply chain management.
Incorporated in Hanoi, the capital city of Vietnam, with the global sales office in Singapore, the business and financial hub of the region, they are well connected globally, and their customers are assured of a conducive business environment.
Contact us to discuss your requirements of Vietnam injection mold design and manufacturing service. Our experienced sales team can help you identify the options that best suit your needs.
Their entrepreneurial spirit of agility, simplicity and sincerity continues to drive the way they support their customers and contribute to the growth of the next manufacturing hub of the world.
Location: Ha Noi, Vietnam
Company type: Manufacturing
Year founded:
The number of employees: 200-299
Main Products: Manufacturing plastic molds and molding precision moulds, Mould design, Tool design
Established in as a Singapore company, it changed its name from “Sin-Hanel” to “Zion” in . Zion is now a subsidiary of Kim Tam Joint-stock Company, which is a Vietnam based company founded in .
Zion has more than 200 employees that work in a 6,000 square meter factory in Hanoi. Their experienced team is fluent in foreign languages such as English, French, Chinese, and Spanish; that allows Zion can have smooth communication with foreign businesses.
Zion provides injection mold design services by using professional design software, for example, Siemens-NX10, and Autocad . They also have modern equipment such as CNC machines, CNC EDM, and CNC wire cut machines to carry out the injection molding process.
Zion keeps itself abreast of time, for example, the company purchased a 3D scan machine for the mold design purpose.
Location: Binh Duong, Vietnam
Company type: Manufacturing
Year founded:
The number of employees: 200-299
Main Products: Injection Mold Design, Injection Molding Tools, Blow Mold, Plastic Production, Mechanical parts, Punching Mold
DK MOULD tool shop is located in the suburb of Ho Chi Minh (Vietnam), the most dynamic city of Vietnam. This Vietnamese company was founded in in order to serve Injection molding, blow molding and stamping industry.
This company has been set up in a way to handle efficiently the most simple to the most technical parts following European and Japanese requirements while keeping prices at low Vietnamese standards.
Their set up in Join-Venture with an American plastic/electronic/ assembly manufacturing company and their well balanced level of equipment gives them the keys to handle international business while giving you an easy access to high quality at local price. As they share the same factory , It’s also a direct access to quality ISO and certified system, injection and stamping machines for testing and temporary resources when necessary.
Location: Long An, Vietnam
Company type: Manufacturing
Year founded:
The number of employees: 200-299
Main Products: Injection molds, Plastic molding, Medical Plastics, Electronic Plastics, Technical Plastics, Cosmetic Plastics
MIDA Precision Mold Co., Ltd. are professional injection mold maker, plastic molding, plastics maker in Vietnam. They can provide their customers a perfect solution from designing products and molds, manufacturing, decorating, packaging to delivering products.
MIDA invested equipment system for making precision moulds and modern plastic injection molding machines included full automatic arm robots from leading brand names in Japan, Swiss as: Makino, Mazak, Charmilles, Okamoto, Mitutoyo, Fanuc, Yushin.
Location: Dong Nai Province, Vietnam
Company type: Manufacturing
Year founded:
The number of employees: 200-299
Main Products: Chromate Mold, Injection Molds, Plastic Injection Molding
Y Chi Viet Company Limited (formerly Watson Co., Ltd.) is a joint venture company established in between the Union of Plastics and WATSON E.P Singapore.
Investing, developing and, maintaining the most advanced and modern plating and wastewater treatment system in Vietnam. Automatic UV coating and ultraviolet drying system, ensuring the uniform thickness and high adhesion trusted by Japanese customer. Meeting the variety of injection mold products always meeting RoHS standards in production and product processing.
3D printing technology helps create accurate mechanical parts in a short time, at a very low cost. The only agent in Vietnam of LUBRIZOL USA provding two product lines: CORZAN industrial pipes and FLOWGUARD houseware pipes
Location: QuangNam, Vietnam
Company type: Manufacturing
Year founded:
The number of employees: 200-299
Main Products: Plastic Parts, Asembly of Electronic, Assembly
INT Company Limited is the professional manufacturer of plastic products located in the Dien Nam-Dien Ngoc Industrial Zone, QuangNam Province, Vietnam. They are commited to provide highest quality products, the best delivery time and the best possible price.
Thanks to the effort and passion of their team, they proudly gained trust and credibility with their customers in Vietnam as well as customer oversea. They specialize in supplying PLASTIC INJECTION PROCESSING ACCORDING TO THE REQUIREMENTS of the products: Household plastic, Industrial plastic, Technical plastic.
Location: Binh Duong, Vietnam
Company type: Manufacturing
Year founded:
The number of employees: 200-299
Main Products: Precision machining parts/ molds, Plastic parts/ molds, Stamping parts, Aluminum die casting parts
CNCPS JSC specializes in producing plastic injection molds for household and industrial products, electrical components, plastic parts, etc. Provide complete supply chain, high-quality products enhance the productivity of customers, Export to Japan, Germany, and the United States.
CNCPS is a company that engaged in manufacturing industry. Their company was established in and is now proud to be a leading and reliable name for precision machining in Vietnam. They have been expanding to manufacturing injection molds, plastic parts, stamping parts, aluminum die casting parts. All the production that they invest in must share the same core values: high precision, high quality.
Location: Ho Chi Minh City, Vietnam
Company type: Manufacturing
Year founded:
The number of employees: 200-299
Main Products: Manufacturing plastic injection molds for such industries as food and beverage, cosmetic, medical equipment
Duytan Precision Mold Co.,Ltd, former Mold-Mechanical Department of Duytan Plastic Group, is well known for over 25 years of experience in plastic mold industry.
Thanks to innovation and continuous development, in April , the company was offically established, covering an area of m2 and having over 180 enthusiastic officers and employees.
With the motto of “Precision In Every Detail”, they are committed to delivering the precise, qualified, high-speed and durable mold systems and adding more value to products, ensuring the progress are scheduled.
If you’re looking for more injection molding manufacturers, Also you can choose a Chinese injection mold supplier: Zetar Mold
Location: Shanghai, China
Company type: Manufacturing
Year founded:
The number of employees: 201-300
Main product: Plastic Injection Mold, Plastic Injection Molding Manufacturing
Other products: Overmolding Products, Insert Molding Products, 3D printing and CNC Prototyping
Zetar is a top-end turnkey manufacturing company that helps wholesalers and brand owners fulfill their products.
Zetar has more than 20 English speakers and 7 experienced mold design engineers (some of them can also speak English) with technique and english communication, which could make sure fluent communication and offer feasible design solutions.
Now total Zetar has mold making shop in house, 31 sets injection molding machines range from 60T-T. which 6 sets are in dust-free room(M7 Class), assembly room and logo printing room. The largest T injection molding machines could produce product weight up to g.
Zetar definitely also has many certificates: TUV, ISO (quality system certification), TS (certification for auto parts making), ISO (certification for showing not harming the environment during whole manufacturing process).
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