Best Plastic Injection Molding Service In China

What is plastic injection molding process?

Plastic Injection Moulding is a manufacturing process for plastic components by injecting molten material into a mould or mold, it is a suitable method for manufacturing high-quality plastic parts in high volume quickly. The injection molding process is suitable for many plastic materials, including most commonly thermoplastic and thermosetting polymers, for example, PC, PMMA, ABS, PS, PA6, POM, PE, PEEK, etc, and these plastic parts are used in the auto industry, appliance industry, medical equipment, food packaging, aircraft industry, etc.

The main advantage of plastic injection molding

  • Wide range of materials: manufacturers can choose one or multiple plastic materials for each component to get great performance, including PC, PMMA, ABS, POM, PP, or PC+ABS;
  • Consistency: if the process parameters are confirmed, the injection molding process can produce thousands of components quickly at a consistent quality, it is good for high-volume manufacturing;
  • Low Average Cost: the injection mold is the most expensive part, the average cost of plastic components is really low, particularly when you need to produce it in high numbers;
  • Flexibility: plastic injection molding process can produce a variety of components, including parts that are complex and highly detailed;
  • Quality: whether manufacturers are looking for strong, tensile, or highly detailed components, the injection molding process is able to produce them at a high quality repeatedly;
  • Efficiency: once the process has been set up and tested, injection molding machines can produce thousands of items per day;

Injection molding machine

An injection molding machine, also known as an injection press, works with an injection mold for manufacturing plastic components. It consists of two main parts, an injection unit, and a clamping unit. The famous brands are ENGEL, NETSTAL, Battenfeld, Nissei, LG, HTF, etc.

There are three types of injection mold machines:

  • Hydraulic type: it is the most common injection molding machine in the world, but it is not precise;
  • Mechanical type machine uses the toggle system for bigger tonnage on the clamp side of the machine. Tonnage is very important for injection molding machines, or it will create flash in the plastic product;
  • Electric type: The electric injection molding machine, also known as Electric Machine Technology (EMT), can reduce operating costs and it is more environment-friendly. Electric presses have been shown to be quieter, faster, and have higher accuracy, however, it is more expensive.

Plastic Injection molding Process

Plastic injection molding is a very professional machining method for plastic components, therefore, most companies don’t know the detailed process when need to make plastic parts:

  • Step ONE: Making a plastic prototyping part to verify the design and confirm the material;
  • Step TWO: If the plastic prototype is Ok, you can manufacture the mold. Normally, the mold is made of steel or aluminum;
  • Step THREE: Feeding and melting the plastic material, you need to know the temperature of plastic that you choose;
  • Step FOUR: Injecting the plastic into the mold;
  • Step FIVE: Holding sometimes according to plastic parts and cooling it;
  • Step SIX: Molding plastic parts release and finishing process;

Plastic Material for injection molding

UVPLASTIC provides different injection molding plastic materials for different plastic parts:

Material NameApplicationsAdvantageDisadvantage
PMMA or Acrylic (Polymethyl Methacrylate, plexiglass)Lens, headlight
Transparent pipes
Light guide part
Optical fibers
Outstanding optical properties;
Better scratch resistance than polycarbonate;
Great polished surface;
Easy to polish the surface;
A low shrinking percentage;
Can be silk-screen printed;
Good for thick plastic parts;
Not stronger than PC, and friable material.
Heat resistance is not good;
Polycarbonate (PC)Automotive and bus glass;
Luggage case;
Lights indoor and outdoor;
Plastic parts for medical devices;
Protection cover for the camera;
Unbeatable strength;
Good optical properties;
Long lifespan outdoor;
Good dimensional stability;
High heat resistance;
Low shrink;
Poor scratch resistance;
Not good for opaque parts, ABS/PC blend material is a good alternative;
Not good for thick plastic parts can use PMMA for thick plastic parts.
ABS (Acrylonitrile butadiene styrene)Automotive interior parts;
Headlight part;
Door handle;
Machine housings;
High dimensional stability;
Inexpensive cost;
Tough, impact-resistant;
Good chemical-resistant;
Low shrink;
Not good for thick plastic parts;
ABS/PC (blend plastic material)Glove boxes;
Overhead and middle consoles;
TV frames
Laptop monitor enclosures;
Knee bolsters;
Blow-molded seatbacks;
Combines the strength and heat resistance of PC with the flexibility of ABS;
High impact strength and thermal resistance;
Price is better than polycarbonate;
POM or Acetal (Polyoxymethylene)Automotive Interior Appearance;
Plastic parts for Medical and Healthcare;
Electrical switch components;
Gears, pump impellers;
Strength is higher than all polyamide varieties;
The yield strength is higher than that of nylon 6 and nylon 610;
High strength, toughness, rigidity, and low coefficient of friction in a wide temperature range;
Oil resistant and many chemical reagents and solvents;
Good wear resistance;
High hygroscopicity;
Reduced impact strength in a dry environment;
The molding process is difficult to control;
PA or Nylon (polyamide)Plastic machine parts;
Wear pads;
Guitar strings;
Tennis racket;
Medical implants;
Electrical connectors;
High mechanical strength, and stiffness;
Good sliding properties;
High hardness, and toughness;
Good fatigue resistance;
High mechanical damping ability;
Excellent wear resistance;
Good electrical insulating properties;
High shrinkage in molded sections;
Pollution problems;
Low absorbency;
HDPE (High-density polyethylene)Plastic bottles;
Chemical containers;
Plastic automobile parts;
Storage containers;
High Strength;
Good resistance to chemicals, including water, solvents, acids, and detergents;
Better price;
Highly Flammable;
High Thermal Expansion;
Not Resistant to Chlorinated Hydrocarbons;
PEEK (Polyether Ether Ketone)Plastic parts for aerospace;
Plastic parts for medical and healthcare;
Seals, Washers, and Bearings for Automotive parts;
Electrical/electronic parts;
Exceptional tensile properties;
Excellent creep resistance;
Low friction;
Good dimensional stability;
Exception insulation properties;
Excellent sterilization resistance at high temperature;
Processing at high temperatures;
Low resistance to UV light;

Low-volume manufacturing by injection molding

Normally, injection molding is good for high-volume products, but we can make soft tooling for injection molding, which is suitable for low-volume plastic parts.

Gallery of injection parts

Frequently Asked Questions

Hard tooling, also named “injection molding”, is very expensive, but it is good to manufacture plastic parts in high volume, therefore, the average cost is very low.

And soft tooling for injection molding is cheaper than hard tooling, but one soft tooling can make 20 or 25 pcs plastic parts only, therefore, the average cost is higher;

Recently, there is a simple mold, which is a metal mold, but the price is not high, therefore it is suitable for middle-volume plastic parts, the average cost is Ok, and the quality is the same as hard tooling, but the lifespan is shorter than hard tooling.

Conclusion: if you need low-volume plastic parts for prototypes, soft tooling will be good

  • Plastic casting molding;
  • Injection plastic molding;
  • Blow plastic molding;
  • Compression plastic molding;
  • Rotational plastic molding;
  • Vacuum forming molding;

Normally, we use aluminum and die steel for plastic injection molding.


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