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What Is Injection Molding

Injection Molding is a way of molding plastic products. Specifically, it is to put the mold into the machine and close the mold. After the raw material is melted at a specific temperature, it is injected into the cavity of the mold.


After the Injection Molding machine maintains the pressure for a short time, the finished product can be obtained by cooling and solidifying for a period of time.

Injection Molding Factory

- Benefits of Injection Molding

Compared with other parts manufacturing methods, it is faster and more efficient


The operation of Injection Molding can be automated, and there are many varieties of colors. And The shape of it, can be from simple to complex, the size can be from large to small, and the injection molded part size is accurate, the product is easy to replace, and it can be made into complex shapes. 

Injection Molded Part

Injection Molding is suitable for mass production and complex shaped products and other molding processing fields, is one of the important processing methods.


- How Do Injection Molding Machines Work

1. The Injection Molding raw material is heated and melted

2. Mold closing

3. Raw materials enter the mold cavity

4. The injection molding machine keeps the pressure of the mold

5. Raw material cooling

6. Mould open

7. Take out the injection moulding products



What Materials Can Be Injection Molded

What Materials Can Be Injection Molded?If you need injection moulding products, you must to know.

Injection Molding raw material

When choosing a plastic, the first thing you have to consider is the part’s function and the physical environment that it’s going to be exposed to. So clearly you’ll need to consider what type of injection molding material is going to stand up to various environmental challenges such as temperature fluctuations, moisture, chemical exposure, UV light, and many more.


Then the material’s strength, durability, flexibility, color, and cost come into play. Therefore, we’d like to help you refine your search by explaining the properties of the four most common plastic injection molding resins that we use for the majority of parts that we make.


- Can HDPE Be Injection Molded

HDPE has become one of the fastest growing plastic varieties in my country. HDPE has many excellent physical and mechanical properties and good performance and is widely used in injection molding products.


However, the workability, toughness and ESCR of HDPE are all poor. When the temperature of HDPE is lower than room temperature, there is a phenomenon of post-shrinkage. Therefore, it is a very important work to analyze the optimal process parameters of HDPE meeting the product parameters.


MIC-ZG has rich experience in manufacturing HDPE products and has investigated the effects of temperature, pressure, time, and excipients on tensile strength, impact strength, elongation at break, and warpage.

At the meantime, MIC-ZG has analyzed the curves of various indicators in various environments, and has obtained the best hdpe injection molding process parameters.We found that the reduction in specimen length is a manifestation of the thermally reversible high elastic deformation generated during the injection molding process.

HDPE Injection Molding Parts

So HDPE injection molding products manufactured by MIC-ZG have strong impact strength, elongation at break, and greatly reduce warpage and shrinkage.

If you have any needs in HDPE injection molding manufacturing, MIC-ZG will solve all problems for you.


- Can Rubber Be Injection Molded

A tripartite collaboration between the design company, the mold supplier, and the manufacturer of the finished product is essential for rubber injection molding. Their collaboration has propelled injection molding technology forward. However, most companies are independent, lack integration, and often have defects in rubber injection molding leading to rework, which often results in late delivery and failure to meet customer expectations.


But MIC-ZG, as a professional rubber injection molding companies is quite different.

Rubber Injection Molding Product

MIC-ZG has the ability to design drawings, make molds and make finished rubber injection molding products, and provide the whole injection molding process service from your idea to finished product delivery.We will discuss the details of your product before working every day, and do a good job in the assignment of work to ensure that it perfectly meets your expected results and arrival time.

In short, MIC-ZG has rich experience in the process and work details of rubber injection molding


At present, the rubber injection molding process is relatively mature, but its use still remains on some traditional conventional rubber products.That is to say, many rubber products still use the molding method of flat vulcanization, which is a waste of a high-quality, efficient and advanced rubber injection molding technology.


Injection molding technology is an increasingly used technical method for rubber products. In the production of high-volume products such as auto parts, electrical and electronic equipment accessories, rubber injection machines can give full play to the advantages of injection molding.Especially, With the continuous application of new technologies and new materials, MIC-ZG have more advanced rubber injection machines,it can realize the technical value of high production efficiency and high product quality, create higher economic benefits, and open up broader prospects.


For Rubber injection molding parts,it has the advantages of compact texture, accurate size and good physical and chemical properties of molded products. 


The new rubber injection molding technology is widely used in rubber injection equipment, which has made its performance improved rapidly, and the quality of rubber products has also been reliably guaranteed.


- Can Polypropylene Be Injection Molded

Polypropylene is one of the common raw materials for injection molding. The selection of raw materials, the temperature of the mold, and the holding pressure time have a huge impact on the yield, thermal, optical and mechanical properties of plastic products.


Typically, MIC-ZG will choose the most suitable polypropylene raw material for you according to your product.

 Polypropylene Injection Molding Part


Here Take Polypropylene Injection Molding temperature as an example:

1. With the increase of Polypropylene Injection Molding temperature temperature and the extension of cooling time, the crystallinity of Polypropylene injection molded products shows an increasing trend;


2. The increase of mold temperature causes the polymer melt viscosity to decrease, the shearing effect of polymer macromolecules is weakened under the same molding pressure, and the degree of molecular orientation decreases;


3. The increase in mold temperature, on the one hand, delays the solidification time of the polymer, which is conducive to crystallization, and on the other hand, promotes the diffusion and accumulation of melt molecules and promotes the growth of crystal grains.



MIC-ZG,who was a professional Supplier of Polypropylene Injection Molding will select the appropriate mold temperature and other parameters for you to ensure that all aspects of the polypropylene injection molding plastic products perfectly meet your needs.


- Can Nylon Be Injection Molded

Nylon is one of the common injection molding raw materials.


Nylon has a high degree of crystallinity (40% to 60%), its molecular structure is linear, and it is a translucent white powder or granule. Has good wear resistance, self-lubrication, flexibility and other characteristics. It is a commonly used injection molding material.


Because it is easy to absorb moisture, it must be dried before molding, so that the water content does not exceed 0.1%; the melt viscosity is low, and the "salivation phenomenon" is prone to occur, and impurities are included; crystalline plastics have good performance, but have a large shrinkage rate and are prone to shrinkage. The internal stress is large, the anisotropy is obvious, and the product is easy to warp and deform.

The nylon injection molding part can be heat-treated according to the use of the product to eliminate the internal pressure.

 nylon injection molding part


There are many products affecting nylon injection molding, so small workshops often do not have standardized processes to solve these problems, resulting in many after-sales problems.


MIC-ZG, has more than 20 years of nylon injection molding experience. We will prepare all injection molding for your nylon products and perfectly meet any requirements you have for nylon injection molding products.


Is Injection Molding Expensive

In MIC-ZG, The answer to “Is Injection Molding Expensive” question is not.


MIC-ZG provides injection mold manufacturing services starting from $0. If you have large quantities of finished products, we can make molds for you for free.


In addition, Different injection molding cost is different.

For example, the door handle of a car, the mold cost is about $3000. For the grille of the car, the mold fee is about $12,000. For a supermarket cart, the mold fee is about $12,000.


Injection molds are very suitable for the production of high-volume plastic products. Put the insert in the mold, and you can get a product in just ten seconds.


But how to calculate the price of injection molding per unit

If you have a high volume product, say you need 10,000 carts, then your tooling fee will only cost you $1.2/piece.


How Much Does Injection Molding Cost

MIC-ZG will choose the most cost-effective mold making method according to your requirements.


And Injection Molding Cost Usually includes 3 Parts


1.Material cost (accounts for approximately 30% of mold price)


Material cost includes: mold core steel + mold base (S50C) + copper male + standard parts + hot runner


Common die steels: S 136, NAK 80, 2344, 2733, P20, 718, SKD 11 and SKD 61

1 Million Cycles - Quenched S 136, Quenched 2344

500,000 cycles - NAK 80, S136

300,000 cycles - 2733, P20,718

Graphite electrode - $6/kg; Copper electrode - $12/kg

The common mold base material is S50C-$1.5/kg.


2.Design cost (accounts for 5% of mold cost)


3.Machining costs (typically account for 30% of tooling costs.)

Machining/Manufacturing Costs: Deep Hole Drilling, CNC Machining, EDM, Wire EDM, Die Polishing, Heat Treatment, Deformation

Length and width of mold core = product size + 30-60mm, core thickness = product thickness + about 80mm

Typically, the length and width of the die base = mold core size increases by 50 to 120 mm per side, and the thickness of the die base is usually twice that of the die core.



In fact, there are two main factors that affect the cost of the mold, namely the complexity and precision of the mold.

The more complex the mold structure, the higher the mold precision, and the higher the production cost, which requires engineers to estimate based on experience.


If you want to get custom injest molding part price, contact us and tell us what you need.

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