Full Services Plastic Injection Molding Manufacturer

Stebro Mold is your reliable partner for custom injection mold making and plastic injection molding manufacturing in China, providing a total concept solution from design and tooling to production, fulfillment, and packaging. Along with plastic injection mold manufacturing, we are focused on plastic injection molding manufacturing in order to provide full services to our customers. We are still trying to provide the best services of custom plastic parts as China manufacturer. Our customers come to us not only for quality parts at the best price delivered on time, but they also look to us for advice on part design, engineering services, support for tooling ideas, and input on the most effective way to incorporate secondary functions. They depend on us for help to satisfy their customers. If you come up with a concept, a design, we can take that to fruition and put it into a deal and manufacture your plastic components and delivery your components to your door.

Our production facility is equipped with 8 sets of Engel Injection moulding machines, ranges from 60 Tons to 150 Tons. We are proficient with engineering material and high-end plastics such as PA, PA+GF, PC/ABS, PBT, PEEK, PPSU, PPS and PEI. You are able to work with the same project manager “From Conception to Completion”, reducing lag time in communication between the mold manufacturing company and injection molding supplier, it can significantly reduce downtime and cost when problems arise in production, saving your time and money. The combined effort of our designers and toolmakers results in molds that ensure product quality, precision tolerances, and optimised cycle times.


Low Volume Injection Molding

High Volume Injection Molding

Insert Injection Molding

Over Molding

Plastic Molding Manufacturing Process

Injection molding produces parts by forcing molten material into a mold where it cools and hardens to the mold’s shape. If you want to have well-prefromance custom plastic parts from China. First, you have to have the 3D part design, then we can make the plastic mold according to your part design. After that, we put the mold on the injection molding machine to make the parts. The injection molding cycle is as follows:

1, Clamping, The mold is closed by a clamping unit, screw begins moving forward for injection.

2, Injection, Plastic pellets are fed by means of a hopper into the injection moulding machine. These pellets move towards the mould by the injection unit. The heat surrounding the barrel and the pressure serve to melt the pellets. This molten plastic would then be fed to the mold and the application of pressure make sure the holding and packing of material.

3, Cooling The cooling process involves the plastic inside the mould beginning to cool after it makes contact with the interior mould. Cooling is done so as to solidify the molten plastic into the desired shape. The part may shrink slightly during cooling. It must be noted that mold should not be opened until required cooling time is elapsed.

4, Ejection As soon as the cooling time elapses, the cooled part is subjected to be ejected from the mold with the help of the Ejection Unit. Ejection is done through the opening of mold where a mechanism pushes the final product out of the mold.

Custom Plastic Injection Molding Design Considerations

If you have a high-volume custom plastic products project that requires injection molding, there are many factors to consider for custom plastic molding, but the part design and tool design are two of the most important factors for making Chinese excellent custom plastic parts. For the part design, you have to think about the material selection, wall thickness, draft angle, Ribs, Sharp vs curved corners, Bosses, surface finishing and so on. For the tool design, you have to think about the injection system, cooling system, ejection system, and mechanical system.

Custom Plastic Injection Molding Services

From molding to assembly and finishing, we assist our customers from original idea to finished solution. As a professional injection moulding manufacturer in China, and having Chinese high-quality custom plastic parts, Stebro offers comprehensive injection molding solution to a wide range of industries including prototyping injection molding and low-volume injection molding, 2K molding, Overmolding and Insert Molding.

Name Description
Low Volume Injection Molding Low volume injection molding manufacturing usually means producing injection molded plastic parts as low as 50 and as many a 100,000 pieces for a production range.
High Volume Injection Molding High-volume injection molding manufacturing is the same as mass injection molding production: fabricating large quantities of plastic injection molded plastic parts in short periods of time.
Precision Injection Molding Precision injection is a kind of injection molding method which is difficult to meet the requirements of injection molding machine and conventional injection molding process.
Vertical Injection Molding Running the plastic injection molding on a vertical injection molding machine.
Insert Molding Insert molding is a process in which plastic is injected into a mold that contains an pre-placed insert.
Over Molding Overmolding is a process where a single part is created using two or more different materials in combination.

Gas-assisted Injection Molding

Gas assist injection molding is a low pressure process that requires the injection of pressurized nitrogen gas into the interior of a mold.
2K Injection Molding 2K injection moulding consists of processing two different polymers or two different colours of one polymer into an end product by means of one injection moulding process.

How the molding process affects the surface finish

For determining the most optimal surface finish, the injection molder, the mold maker and the design engineer need to communicate. The surface finish options depend a great deal on the chemical make-up of the plastic material and steel being used and the design aspects of the part being manufactured. Below are the surfaces which we can make.

Name Description
SPI Mold Surfaces  
VDI Surfaces  
Mold Tech Surfaces  
Color Matches  

Plastic Injection Molding Tolerance:

Unless otherwise specified, we comply with the DIN 16742 standard tolerances for plastic injection moldings.

Most Common Thermoplastics Used In Injection Molding

  • ABS
  • ASA
  • PC
  • PC/ABS
  • POM
  • PMMA


  • PP
  • PS
  • PE
  • PVC
  • TPU
  • TPV
  • TPO
  • TPE
  • PA
  • PA6
  • PA66
  • PEI
  • PSU
  • HDPE
  • LDPE
  • PA11
  • PA12
  • PPS
  • PPA
  • PBT
  • PEEK
  • PPSU

Why Injection Molding at Stebro Mold?

Leading companies in the outdoor power equipment, automotive, consumer and industrial applications markets choose our plastic injection molding expertise for:

  • ISO 9001 certified facilities
  • Turnkey Solutions: all phases of production are completed under one roof, Support in material selection
  • Fully automated tooling with slides, lifters & standalone tool bases
  • Pilot and short run production available upon tooling completion
  • Mass prodution of injection molded parts as well
  • Secondary assembly and painting options available
  • Feasibility determination, MoldFlow Analysis, Design Review, APQP, PPAP and process capability studies
  • We have a commitment to quality and on-time performance

Stebro as one of the molding manufacturers in China is still trying to provide the most excellent and the best-performance custom plastic parts for our customers.

Plastic Injection Moulding Advantages and Disadvantages

Advantage of Plastic Injection Molding

  • The accuracy of the finished product can be within 0.005 inches consistency
  • Plastic Injection molding process is efficient, effective and fast
  • Reduced wast, it is a resourceful process
  • Flexibility in color and material selection
  • Ideal for creating complex, high-strength components
  • Ability to use multiple plastic materials simultaneously
  • Ability to Insert Molding
  • A smooth finished appearance
  • The part cost is low
  • Widely used

Plastic Injection Molding Disadvantages:

  • High initial tooling and machinery cost
  • Inflexibility once the injection mold has been made
  • Not economical for 1 to 100 pcs
  • There are certain design restrictions for plastic injection molding, however, by working alongside our experienced design team you should be able to over initial issues

Plastic Injection Molding Application:

Plastic Injection Molding is the preferred process for manufacturing mass produced custom plastic parts for all industries such as Automotive, Medical, Industrial, Consumer Products, Sporting Goods

  • Electronic Housings
  • Automotive Interiors
  • Lenses
  • Fasteners
  • Toys
  • Bottle Caps
  • Plumbing
  • Appliance
  • Filtration
  • Engine

While during the world plastic injection molding, Chinese injection molded plastic parts have competitive advantage. Custom plastic parts China have low-price with high-quality.

Double Injection Example products

Quality 2K Injection Mold Manufacturer, Affordable Price, Fast Delivery, Free Technical Support, Class A services.

Contact us today to learn how we can meet your needs and exceed your expectations.

Custom Molding Knowledge