Rotational molding (roto-molding) is a plastic forming process that creates seamless, hollow parts by rotating a mold filled with plastic resin in an oven. For protective cases, roto-molding is used to make ultra-durable cases for military, industrial, and heavy-duty applications.
Roto-Molding Process
- Mold is filled with PP or PE powder.
- Mold is heated while rotating biaxially (two axes).
- Plastic melts and coats the inside of the mold evenly.
- Mold is cooled while still rotating.
- Finished part is removed — seamless and stress-free.
Advantages
- Seamless: No weld lines = no weak points = superior impact resistance.
- Thick walls: 5-15mm walls achievable, much thicker than injection molding.
- Low tooling cost: Aluminum molds cost $3,000-$8,000 vs $30,000+ for steel injection molds.
- Large sizes: Cases up to 2m+ possible.
Limitations
- Long cycle time (45-90 min per part) = higher unit cost for small batches.
- Limited to PP and PE (no ABS, no PC).
- Surface finish is matte/textured, not glossy.
Frequently Asked Questions
What is Rotomolded Case?
Rotational molding creates seamless, ultra-durable cases for heavy-duty use.
Does KeXinMaterials make Rotomolded Case?
Yes — KeXinMaterials is a source factory with 9 product lines, including models based on this process.
How do I get a quote for Rotomolded Case?
Submit the 5-step OEM form or email kexin@beeaa.com. Reply within 12 hours.
