How to Add a Logo to Plastic Parts Using Injection Molding

1. Mold-Engraved Logo (Permanent Solution)

The most durable and cost-effective method for high-volume production is to embed the logo directly into the mold.

How It Works:

• Design Preparation: Convert the logo into a vector file (e.g., .AI or .DXF) for CNC machining.

• Mold Machining:

• Raised Logo: The mold cavity is engraved (logo appears recessed in the mold, resulting in a raised logo on the part).

• Recessed Logo: A raised section is added to the mold (logo appears indented on the part).

• Injection Molding Process:

• Higher injection pressure ensures logo details are fully filled.

• Optimal melt temperature prevents incomplete filling (e.g., 230–260°C for ABS).

• Longer holding pressure reduces sink marks.

Pros:

✔ Permanent and wear-resistant
✔ No additional processing cost per part
✔ Consistent quality for high-volume production

Cons:

✖ High initial mold cost
✖ Difficult to modify once the mold is made

Best For:

• Mass-produced items (e.g., consumer electronics, automotive parts).

• Logos requiring durability (e.g., tool grips, medical devices).

2. Post-Molding Logo Application (For Low Volumes or Customization)

If the logo needs to be added after molding (e.g., for small batches or variable designs), consider these methods:

A. Pad Printing (Tampography)

• A silicone pad picks up ink from an etched plate and transfers it onto the plastic part.

• Best For: Curved or irregular surfaces (e.g., bottle caps, buttons).

B. Screen Printing

• Ink is pressed through a mesh stencil onto the part.

• Best For: Flat or slightly curved surfaces (e.g., labels, packaging).

C. Laser Marking

• A laser burns/alters the plastic surface to create a high-contrast mark.

• Best For: Permanent, high-precision logos (e.g., serial numbers, medical devices).

D. Heat Transfer Printing

• A printed foil is heat-pressed onto the plastic part.

• Best For: Multi-color, detailed graphics (e.g., sports equipment, toys).

Pros:

✔ Lower upfront cost (no mold modification)
✔ Flexible for small batches

Cons:

✖ Less durable than molded logos
✖ Additional per-unit cost

Best For:

• Prototypes, short runs, or products requiring frequent logo updates.

3. Two-Shot Molding (For Multi-Material Logos)

If a color-contrast logo is needed, two-shot molding can be used:

1. The base part is molded first.

2. A second material (different color) is injected to form the logo.

Pros:

✔ Highly durable and visually striking
✔ No post-processing needed

Cons:

✖ Expensive molds and machinery
✖ Limited to compatible materials

Best For:

• Premium products (e.g., luxury goods, high-end electronics).

Key Considerations When Adding a Logo

• Logo Design: Avoid ultra-fine details (<0.3mm) to ensure moldability.

• Material Choice: High-flow plastics (e.g., PP, ABS) replicate logos better.

• Testing: Always conduct trial runs to check logo clarity and durability.

Which Method Should You Choose?

Final Thoughts

For long-term branding, mold-engraved logos are the best choice. If flexibility is needed, pad printing or laser marking are great alternatives.