PET Preform Mould Manufacturer: 1 to 72 Cavities Valve-Gate Tooling
We design and manufacture high-precision PET preform injection moulds from 1 to 72 cavities for mineral water, CSD carbonated beverages, edible oil bottles, wide-mouth jars, and 5-gallon water carboys. Built in vacuum-hardened Assab S136 stainless steel (HRC 50–52) with пневmatic valve-gate hot runners, holding ≤0.05 mm wall eccentricity and low acetaldehyde (AA) levels.
- Assab S136 Stainless (HRC 50–52, 3M+ Shots)
- Pneumatic Valve Gate (No Gate Stringing)
- ≤ 0.05 mm Wall Eccentricity & ≤ 0.08g Weight Var.
- In-Press Interchangeable Neck Rings (PCO 1881/1810)
Why Inferior PET Preform Moulds Ruin Stretch-Blowing Yield
A PET bottle is only as good as the preform it is blown from. Even a minor defect in the preform mould causes burst bottles, crooked necks, or off-taste water on your high-speed stretch-blow line:
Gate Crystallization (White Gate Cloudiness)
If the valve pin closes late or cooling around the gate insert is weak, the PET crystallizes white at the bottom cap — causing the base of the bottle to rupture during biaxial stretch blowing.
Preform Wall Eccentricity (>0.10 mm)
When core pins deflect during injection, one side of the preform wall is thicker than the other. During stretch blowing, the thin side over-stretches and bursts while the thick side stays pearlescent.
High Acetaldehyde (AA) & Weight Variation
Dead spots or shear-heating imbalances inside a poorly machined hot-runner manifold degrade PET resin, spiking acetaldehyde (AA) levels that taint mineral water taste and creating >0.3g weight swings across cavities.
PET Preform Mould Specifications: Self-Locking vs. High-Cavitation
Every cavity, core pin, and split neck ring (lip cavity) is CNC-ground to full interchangeability tolerances (±0.005 mm):
| Tooling Parameter | 4 to 24 Cavities (Jar / Oil / 5-Gal Preform) | 32 to 72 Cavities (High-Speed Water / CSD Preform) |
|---|---|---|
| Cavity, Core & Neck Steel | Assab S136 Stainless (Vacuum Hardened HRC 50–52) | Assab S136 (Cavity/Core) + TiN Coated H13/S136 Split Neck Rings |
| Mold Base Steel | P20 Pre-hardened + Electroless Nickel Plated Plates | 420 Stainless (1.2316) Rust-Proof Mold Base |
| Locking Architecture | Individual Self-Locking per Cavity | Individual Dual-Taper Self-Locking + Synchronized Carrier Plate |
| Hot Runner System | Pneumatic Valve-Gate Manifold (PID Closed-Loop) | Naturally Balanced Rheological Manifold + Pneumatic Valve Pins |
| Wall Eccentricity | ≤ 0.06 mm (on 5-gallon / heavy preforms) | ≤ 0.04 mm (on 10g–35g beverage preforms) |
| Shot-to-Shot Weight Var. | ≤ ±0.10 g | ≤ ±0.05 g across all cavities |
| Cooling System | Spiral Core Tube + Chilled Gate Insert + Neck Ring Channels | 3-Stage Post-Mold Take-Out Cooling Plate (Optional) + BeCu Gate Caps |
| Target Cycle Time | 18 – 28s (Edible Oil) / 38 – 55s (700g 5-Gallon) | 10 – 15 seconds (with take-out cooling) / 15 – 19s (in-mold) |
| Guaranteed Mould Life | 2,500,000+ shots | 3,000,000 – 5,000,000+ shots |
For a complete breakdown of cavity count calculation, hot-runner shear control, and PCO neck standards, read our Complete PET Preform Mould Buyer’s Guide.
PET Preform Neck Finishes & Applications We Tool
Water & CSD Beverage (PCO 1881 / 1810 / 26mm / 28mm)
Lightweight 9.5g to 28g water preforms and thick-neck carbonated soft drink (CSD) preforms with precision thread splits and zero parting flash on the sealing rim.
5-Gallon (18.9L / 20L) Water Carboy Preforms
4-, 6-, and 8-cavity heavy-wall (650g–800g) 55mm neck preform moulds engineered with deep spiral core cooling to prevent thick-wall crystallization haziness.
Wide-Mouth Jar, Edible Oil & Cosmetic Preforms
38mm, 48mm, 63mm, 83mm, and 110mm wide-mouth jar preforms, 3-to-5L cooking oil handle preforms, and 20/410 – 24/410 cosmetic dropper/spray preforms.
Individual Self-Locking & Zero-Stringing Valve Gates
1. Dual-Cone Individual Cavity Self-Locking
Every single cavity, core pin, and split neck ring features an independent dual-tapered self-locking cone ground on Swiss Studer cylindrical grinders to ±0.002 mm. Even on a standard toggle press, the core cannot shift — guaranteeing uniform bottle wall thickness after stretch blowing.
2. Pneumatic Valve-Gate & Low-AA Manifold
Our naturally balanced hot-runner manifold uses smooth, dead-spot-free melt channels and пневmatic cylinder valve pins that shut off cleanly inside water-cooled gate inserts — leaving a smooth <0.2 mm gate vestige with zero stringing and zero gate crystallinity.
Complete PET Preform + Cap + Stretch-Blow Mould Package
Launching a complete bottle line? We engineer the entire tooling ecosystem under one roof so your preform neck thread, bottle cap, and blow mould fit together with 100% leak-proof torque:
- PET Preform Moulds (1 to 72 Cavities): S136 vacuum-hardened, fully interchangeable spares.
- Closure & Flip-Top Cap Moulds (8 to 48 Cavities): See our plastic cap & closure moulds et flip-top cap moulds.
- Stretch Blow Bottle Moulds: Aircraft-grade 7075 aluminum or S136 blow cavities — see our blow mold manufacturing.
Sourcing a PET Preform Mould?
Send your bottle drawing, preform gram weight, neck standard (e.g., PCO 1881, 38mm, 55mm), and hourly output target. We will recommend the optimal cavity count and return an itemized quote within 24 hours.
PET Preform Mould FAQ
How do I choose the right number of cavities (8, 16, 24, 32, 48, or 72) for a PET preform mould?
Cavity count is matched to your stretch-blow molding machine output and injection press clamping tonnage/shot weight. For example, at a 15-second cycle, a 16-cavity mould produces ~3,800 preforms/hour, a 24-cavity mould produces ~5,700/hour, and a 48-cavity mould produces ~11,500+/hour. Share your bottle volume and press model, and we will size the exact cavitation.
How much does a PET preform mould cost in China?
An 8- or 12-cavity valve-gate PET preform mould in Assab S136 stainless steel typically ranges from USD 12,000 to USD 22,000. A 24- or 32-cavity self-locking valve-gate preform mould costs between USD 25,000 and USD 45,000, while high-speed 48- to 72-cavity systems with take-out cooling plates range from USD 50,000 to USD 88,000+.
How do you prevent white crystallization at the preform gate and neck?
PET crystallizes white if it stays between 120°C and 200°C too long without rapid quenching. We surround every valve-gate nozzle tip with dedicated chilled-water channels (8–10°C) and run deep spiral cooling tubes to the very tip of the S136 core pin, quenching the gate amorphous and crystal-clear immediately after valve-pin shutoff.
Are your preform cavities, cores, and neck rings interchangeable?
Yes. All cavities, core pins, and split neck rings are CNC-ground to within ±0.005 mm tolerance and supplied with a spare-parts kit (extra heaters, thermocouples, O-rings, and neck inserts) so any worn insert can be replaced on-site without hand-fitting.
