About Sailwin Mold: Precision Plastic Mold Factory Since 2013
Specialized in high-cavitation bottle cap molds, PET preform injection molds, and heavy-duty extrusion blow molds for rigid packaging, chemical containers, and beverage bottling plants worldwide.
Engineering Excellence in Rigid Packaging Molds
Founded in 2013, Sailwin Mold has grown into a premier Chinese manufacturer specializing exclusively in the design, engineering, and manufacturing of precision molds for the packaging and container industry. Located in Taizhou, Zhejiang Province, our state-of-the-art tooling center covers over 8,000 square meters equipped with world-class CNC machining, wire EDM, and dedicated trial-molding equipment.
Unlike generalized job shops, Sailwin focuses deeply on three core product pillars:
- Precision Cap & Closure Injection Molds: High-cavitation (up to 72 cavities) tooling for mineral water 1881/3025 caps, 5-gallon non-spill closures, edible oil pull-up spouts, cosmetic flip-top closures, and child-resistant packaging.
- PET Preform Injection Molds: Self-locking cavity alignment and hot runner valve-gate systems (1 to 72 cavities) guaranteeing concentricity within ±0.05 mm and acetaldehyde (AA) levels below 1.5 ppm.
- Extrusion Blow Molds & Machine Automation: Industrial blow molds from 0.1L bottles up to 200L L-ring chemical drums and IBC containers, alongside turnkey downstream bottle cap slitting, lining, and assembly machinery.
In-House Tooling Machinery & Quality Assurance
To guarantee micron-level precision and millions of uninterrupted production cycles, every core mold component is machined, heat-treated, and inspected in-house under strict ISO 9001:2015 quality control workflows:
High-Precision 5-Axis CNC Machining
Imported high-speed machining centers (spindle speed 24,000+ RPM) ensure smooth cavity contours, precise parting lines, and zero parting flash on complex bottle and cap geometries.
Sodick Mirror Spark & Wire EDM
Sub-micron precision wire cutting and mirror EDM achieving surface finish Ra ≤ 0.1 μm without hand-polishing distortion, ensuring seamless thread release and uniform wall thickness.
Hexagon CMM Dimensional Inspection
Three-coordinate measuring machines (CMM) and optical 2D vision projectors verify every cavity insert, core pin, and neck ring against original 3D CAD models before assembly.
100% In-House Trial Molding (FAT)
Dedicated Haitian servo injection molding machines (160T to 650T) and extrusion blow molders run 4-hour continuous dry-cycle tests, providing 4K video proof and DHL sample batches to clients.
Premium Tooling Steel & Component Standards
| Component | Steel / Material Standard | Hardness (HRC) | Operational Lifespan |
|---|---|---|---|
| Cap Mold Cavity & Core | Swedish ASSAB S136 / Stavax ESR Stainless Steel | HRC 48 – 52 | ≥ 5,000,000 Shots |
| PET Preform Cavity & Gate Insert | S136 Vacuum Heat Treated / Be-Cu Gate Inserts | HRC 50 – 54 | ≥ 4,000,000 Shots |
| Blow Mold Cavity Body | Aircraft Aluminum 7075-T6 / German 1.2316 / P20 | HB 150 / HRC 32 – 36 | ≥ 3,000,000 Cycles |
| Pinch-Off Cutting Blades | C17200 Beryllium Copper / Böhler M390 High-Wear Inserts | HRC 40 / HRC 58 – 60 | Rapid heat dissipation + clean pinch |
Partner with China’s Premier Packaging Tooling Specialist
Whether you need high-speed bottle cap molds, turnkey preform injection tooling, or industrial blow mold solutions, our engineering team provides complete DFM analysis and fixed-price quotation within 24 hours.
