TPU injection molding succeeds when grade selection, drying, mold design, filling, cooling, demolding, inspection, and packaging are controlled as one process. TPU performance depends on chemistry and grade, so a generic recipe or hardness number cannot replace the supplier’s data sheet.
Define the grade and part requirement
- Specify hardness, flexibility, compression, tear, abrasion, chemical exposure, temperature, color, and service life.
- Confirm whether the part is a seal, grip, gasket, protective cover, flexible hinge, wheel, or overmolded component.
- Approve the exact chemistry, lot, color, additives, and substitution rules.
Prepare and mold the material
- Dry hygroscopic grades according to the supplier guide and maintain sealed handling.
- Design gates, runners, vents, cooling, ejectors, draft, surface finish, and release around the soft material.
- Control screw shear, melt temperature, fill, pack, mold temperature, cooling, purge, and residence time.
Inspect and release the part
Check dimensions, hardness, appearance, flash, voids, splay, adhesion, elasticity, assembly, and application-specific performance. Protect molded TPU from contamination and distortion during handling. Release production only after the process window and change-control rules are documented.
Plan the next step
Share your part, resin, annual volume, critical dimensions, finish, and timing with the Cavity Mold team through our contact page. We can review the manufacturing risks and recommend a practical next step.
Related Cavity Mold resources
- Injection mold engineering services
- Plastic injection molding services
- Injection mold making services
- Contact Cavity Mold
Technical references
- Avient TPE injection molding guide
- Covestro TPU processing technology
- BASF Elastollan TPU processing recommendations
Protect TPU function across every handoff
TPU parts can lose value when material, geometry, mold release, process, and inspection are handled as separate conversations. Keep the functional requirement attached to every stage.
| Decision | What to check | Boundary |
|---|---|---|
| Requirement | Define flexibility, compression, tear, abrasion, grip, temperature, chemistry, and assembly. | Select tests that represent the part, not only a material brochure. |
| Material and design | Approve grade, hardness, wall, draft, radii, gates, and venting. | Check stress and release before tool steel. |
| Process and mold | Control material condition, filling, packing, cooling, and ejection. | Record the condition that changes function or appearance. |
| Inspection and handling | Measure the functional CTQ, dimensions, appearance, and storage state. | Flexible parts may change after ejection and conditioning. |
TPU launch path
- Freeze the functional requirement.
- Review material and geometry together.
- Pilot the highest-risk feature.
- Release the process with traceability and acceptance evidence.
Use engineering review early and carry the final requirement into the TPU RFQ.