plastic-injection-molding

Custom Plastic Injection Molding – From Prototype to High-Volume Production

Plastic Injection Molding is a manufacturing process used to produce parts by injecting molten plastic into a mold cavity. It is one of the most common methods for producing high-volume plastic parts with precise shapes and consistent quality.

This process is capable of producing a wide variety of plastic products with high precision and repeatability. It can create parts with complex geometries, from simple consumer goods like plastic utensils to highly technical components in the automotive and electronics industries.

Typical molding processes for plastic parts include the following:

  • Plastic Injection Molding
  • Double-shot Injection Molding
  • Overmolding
  • Insert Molding
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How Does Plastic
Injection Molding Works?

Plastic injection molding works by heating plastic material until it becomes molten and then injecting it into a precisely designed mold under high pressure. The process begins with plastic pellets being fed into a heated barrel where they are melted by a rotating screw. Once the plastic is fully molten, it is injected into the mold cavity, which is held together by a clamping unit. The molten plastic fills the mold, taking its shape, and is then allowed to cool and solidify. After cooling, the mold is opened, and the finished part is ejected, ready for further processing or assembly. This method allows for high precision, quick production cycles, and the ability to create complex shapes with minimal waste.

How Does Plastic  
Injection Molding Works?

Injection Molding Capacity

Standards
Description
Maximum Part Size
1200*1200*800mm
Minimum Part Size
3*2*2mm
Part to Part Repeatability
±0.1 mm
Mold Cavity Tolerances
±0.02 mm
Undercuts
Y-type, L-type undercuts
Wall Thickness
0.5 mm to 12 mm
Draft
0.5° to 2°
Lead Time
Most orders can be completed within 15 working days

Plastic Injection Molding Materials

The choice of material for plastic injection molding depends on the specific requirements of the part, such as strength, flexibility, heat resistance, and environmental factors.
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Finishing Options for Plastic Injection Molding

Finishing options for plastic injection molding are critical for enhancing the aesthetics, functionality, and durability of the molded parts.

Painting
Description:A layer of paint is applied to the surface of the molded part to achieve a specific color, texture, or appearance.
Silk Screening
Description: A method of printing using a mesh screen to transfer ink onto the surface of the molded part.
Laser Etching or Engraving
Description: Laser technology is used to create detailed designs or markings on the surface of the molded part.
Pad Printing
Description:A printing technique used to transfer ink onto a curved or irregular surface.
Mold texturing
Description:The molding surface is intentionally roughened or patterned, either through the mold design or by post-processing.
Heat Staking or Ultrasonic Welding
Description: Heat staking uses heat to melt plastic to join parts, while ultrasonic welding uses high-frequency vibrations to bond plastics together.

Contact us now for reliable,

custom plastic injection molding solutions that meet your exact specifications!

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The Process of Our Plastic Injection Molding Service

01

Upload a CAD File

Upload your 3D CAD drawings and provide the manufacturing process
02

Receive a quote

We will send you a quote within 2 business days
03

DFM & tool approval

Receive a comprehensive Design for Manufacturing analysis for approval before the construction of your tool begins
04

Receive T1 samples

Before starting production, we send T1 sample for your confirmation
05

Production & delivery

Once the sample is approved, we'll start the manufacturing process and deliver them to you
06

Reorder Parts

You can contact us to easily reorder parts.

Frequently Asked Questions

What plastics can you use for injection molding?

We support a wide range of engineering plastics including ABS, PC, PA66 (Nylon), POM (Delrin), PMMA (Acrylic), PEEK, PEI (Ultem), PP, PE, TPE, TPU, and more. Material selection depends on strength, heat resistance, flexibility, and application requirements.

What is the minimum order quantity (MOQ)?

We have no MOQ for prototypes. For production orders, we are flexible and can accommodate both small-batch (500+ pcs) and high-volume (1M+ pcs) runs.

What tolerances can you achieve?

Standard part-to-part repeatability is ±0.1 mm, with mold cavity tolerances down to ±0.02 mm for precision features.

How long does it take to get samples?

We provide T1 samples for your confirmation before mass production begins. Lead time for most orders is within 30 - 35 working days.

Do you provide DFM analysis?

Yes. Before tooling begins, we provide a comprehensive Design for Manufacturing (DFM) analysis to optimize your design for cost and manufacturability.

What CAD formats do you accept?

We accept STEP (STP), IGES (IGS), and DWG files for quoting and manufacturing.
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Tel:+86 0752-3336216
Email:Sales@shinzoft.com