Bobbin Mold · Plastic Bobbin Mold · Yarn Bobbin Mould · Textile Bobbin Mould

Every precision bobbin mold starts with your sample. We receive the original plastic bobbin, yarn spool, or textile bobbin sample from the customer. Our engineering team carefully inspects the part geometry, wall thickness, surface finish, and functional requirements.

We document all critical dimensions, draft angles, gate locations, and ejection features. For textile bobbin mould applications, special attention is paid to the winding surface smoothness and flange geometry.

After receiving the sample, we perform precision measurement using CMM (coordinate measuring machine) and optical comparators. All dimensions are recorded and used to build a 3D product model in CAD (UG NX / SolidWorks).

The 3D model includes all features: core taper, flange undercuts, gate marks, ejection pads, and any text or branding. For yarn bobbin mould projects, we simulate the winding dynamics to ensure optimal surface finish.

• High-accuracy CMM inspection (±0.005 mm)
• 3D surface modeling with draft analysis
• Mold flow analysis preparation
• Customer review package (3D PDF + STEP files)

Once the 3D product model is approved by the customer, we begin the mold 3D design. This is the most critical phase for a plastic bobbin mold: we design the cavity, core, cooling system, ejection mechanism, and gating layout.

For textile bobbin mould applications, we optimize the cooling channels to minimize cycle time while maintaining dimensional stability. We also design slide mechanisms for any undercuts and choose the appropriate steel grade (DIN 1.2738, H13, etc.).

• Full 3D mold assembly (cavity/core/inserts)
• Cooling system design (conformal cooling available)
• Ejection system (pin / stripper plate)
• Hot runner or cold runner selection
• 2D detailed drawings for manufacturing

Machining Operations

• CNC Milling — roughing of mold base & cavity blocks
• CNC Turning — rough & finish turning of core pins & round inserts
• High-Speed Engraving — fine detail & texture on cavity surface
• EDM (Wire & Sinker) — precision cavities, sharp corners & complex geometries
• Heat treatment & nitriding (HRC 42–65)
• Final grinding & polishing

After machining and assembly, the bobbin mold is installed on an injection molding machine for trial molding. We run the mold under actual production conditions — temperature, pressure, injection speed, and cooling time are optimized.

The first-shot samples are inspected for dimensions, surface finish, flash, warpage, and cycle time. For yarn bobbin mould projects, we also check the winding surface smoothness and concentricity.

• Injection machine setup (tonnage, temperature profile)
• First article inspection (FAI)
• Process parameter optimization
• Defect analysis & mold adjustment if needed

We pack the trial-molded bobbin samples (typically 10–20 pieces) together with the inspection report and ship them to the customer for final approval. The sample package includes:

• Dimension report (with CMM data)
• Surface finish & visual inspection photos
• Material certificate (if applicable)
• Mold trial video & process parameters

Once the customer confirms the samples meet all requirements, we proceed to final mold finishing and export preparation.

After final customer approval, the plastic bobbin mold is thoroughly cleaned, coated with anti-rust oil, and packed for export. Our standard export packaging includes:

• Wooden crate (ISPM-15 certified)
• VCI anti-rust film & desiccant
• Mold documentation (2D/3D drawings, BOM, spare parts list)
• Mold test report & video (provided digitally)

We arrange shipping by sea or air, with full customs clearance support. Our molds are exported worldwide to textile, cable, and industrial spool manufacturers.