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Push‑Pull Opening Cap Mould
SINOMOULD’s push‑pull opening cap mould is specifically designed for sports bottles, beverage bottles, and daily chemical packaging caps. Featuring a multi‑cavity hot runner structure combined with precision slider and angled lifter demoulding systems, it ensures smooth opening/closing of the push‑pull mechanism and reliable sealing. The mould is compatible with PP, PE, HDPE, and other materials, with cavity counts ranging from 8 to 48 cavities and cycle times as low as 4.5 seconds, meeting the demands of high‑speed automated production.
Push‑Pull Opening Cap Mould Specifications
| Mould Cavity Steel | S136 / 2316 / FS636, HRC 48–52 | Recommended Injection Machine | 80T–380T, screw diameter 32–65mm |
|---|---|---|---|
| Mould Core Steel | S136 / M310, HRC 52–55 | Plastic Material | PP: 10–30; PE/HDPE: 0.3–5 |
| Mould Base Standard / Steel | LKM / HASCO / DME, P20 / 4Cr13 | Ejection System | Stripper plate + angled lifters / slide / unscrewing mechanism |
| Sliders, Inserts, Lifters Steel | 718H / H13, HRC 38–48; Inserts: BeCu | Injection Process | Melt temperature 180–240°C, mould temperature 40–60°C, injection pressure 60–100 MPa |
| Number of Cavities | 8 / 12 / 16 / 24 / 32 / 48 cavities (customizable) | Injection Cycle Time | 4.5–10 seconds |
| Hot Runner System | Valve‑gated / open, YUDO / Mastip / Husky | Mould Manufacturing Lead Time | 40–65 days |
Push‑Pull Opening Cap Mould Quality Control Points
- Push‑Pull Mechanism Precision: Slide rail and snap‑fit clearance controlled within ±0.02 mm; opening/closing cycle life ≥5,000 cycles.
- Sealing Performance: Mirror‑polished to SPI A3 grade; valve‑gate eliminates gate marks; sealing surface free from flash.
- Corrosion Resistance & Long Life: S136 stainless steel with vacuum quenching; mould life ≥3,000,000 cycles.
- Cavity‑to‑Cavity Consistency: Naturally balanced hot runner + independent temperature control; dimensional deviation ≤±0.03 mm; weight deviation ≤±0.5%.
- Interchangeability Design: Cores and cavity inserts standardised; damaged single cavities can be quickly replaced.
Push‑Pull Opening Cap Mould Machining Essentials
- High‑Precision CNC Machining: 5‑axis CNC + high‑speed engraving/milling; critical dimensions within ±0.005 mm.
- Mirror EDM Finishing: Push‑pull surfaces and sealing areas finished with mirror EDM; Ra ≤ 0.1 μm.
- Beryllium Copper Insert Cooling Optimisation: BeCu inserts are embedded in areas with wall thickness variations to ensure uniform cooling and eliminate deformation.
- Mould Flow Analysis & Trial Verification: Moldflow analysis of gate location, weld lines, and warpage; full CMM dimensional inspection after T1 trial.
