Unscrewing Mould

Unscrewing Mould Manufacturing for Threaded Plastic Parts

UTTMould designs and manufactures unscrewing moulds for plastic parts with internal or external threads that cannot be ejected safely by standard mold ejection. The unscrewing mechanism helps release threaded features without damaging the part, thread profile or sealing function.

Unscrewing molds are used for caps, closures, connectors, threaded housings, medical and consumer product components, automotive parts and industrial plastic parts that require reliable thread quality.

Unscrewing Mold Capabilities

Capability	Engineering Focus	Customer Benefit
Internal thread molding	Core rotation, thread release direction and ejection sequence	Protects thread accuracy during demolding
External thread molding	Parting line, shut-off, thread surface and slider/lifter planning	Improves appearance and functional fit
Drive mechanism design	Rack, gear, hydraulic cylinder, hydraulic motor or mechanical drive review	Matches mold structure to part and production requirements
Trial and adjustment	Thread fit, cycle stability, lubrication and wear review	Supports long-term mold reliability

When to Use an Unscrewing Mold

• The part has threads that would be damaged by direct ejection.
• The thread must meet assembly, sealing or torque requirements.
• The product needs repeatable internal or external thread quality.
• The design requires a reliable mechanism for automated demolding.

Unscrewing Mold Project Process

1. Thread review: We check thread type, pitch, depth, tolerance, material shrinkage and function.
2. DFM review: Engineers evaluate draft, wall thickness, parting line, gate location and demolding direction.
3. Mechanism design: We define the unscrewing drive, core structure, guiding, cooling and ejection sequence.
4. Mold manufacturing: Mold components are machined, fitted and assembled for trial.
5. Trial validation: Thread fit, appearance, dimensions and mold movement are checked before approval.

Related Services

Unscrewing mold projects often need careful DFM and mold design, precision mold making, and controlled quality inspection. UTTMould supports these steps for export mold and molding projects.

Frequently Asked Questions

What is an unscrewing mould?

An unscrewing mould is an injection mold with a mechanism that rotates or releases threaded features before the plastic part is ejected.

When is an unscrewing mechanism needed?

It is usually needed when internal or external threads cannot be stripped from the mold without damaging the part.

Can UTTMould design molds for internal threaded plastic parts?

Yes. We can review the thread structure, material, tolerance and demolding method before mold manufacturing.

What files are needed for a quotation?

Please send 3D files, 2D drawings, material, thread requirements, expected quantity and any assembly or sealing requirements.