4-cavity PET preform mold
FEATURES
Hard Power Infrastructure – The Unshakable Foundation of Quality
Your trust in us begins with what we have on our shop floor. Our manufacturing and testing equipment form the bedrock upon which every mold’s precision and longevity rest.
State-of-the-Art Mold Manufacturing Equipment
Our factory is equipped with 5‑axis high-speed machining centers capable of machining complex curved surfaces with an accuracy of 0.002mm. For 4-cavity PET preform molds, this means the parting lines on your preforms will be smooth, flash‑free, and aesthetically perfect—eliminating costly secondary deburring operations. Slow wire EDM machines allow us to machine fine micro‑holes and narrow slots as small as 0.03mm without deforming thin‑walled sections. This ensures that the delicate neck finish and thread profiles of each preform cavity are machined with surgical precision.
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Mold Description
Product Materials:
pet petg pp
Mold Material:
S136ESR
Number of Cavities:
1*4
Glue Feeding Method:
Hot runner
Cooling Method:
Water cooling
Molding Cycle
22.5s
- The mold manufacturing process and product material selection
Every mold base and component is machined on large‑format gantry machining centers with rigid workholding and real‑time thermal compensation. Temperature‑controlled grinding processes guarantee that the guide posts, bushes, and locating rings achieve class‑leading concentricity across all four cavities.
Injection Molding Machines – Simulating Your Production Reality
To validate mold performance before delivery, our in‑house injection molding laboratory is equipped with all‑electric servo‑driven injection molding machines with locking forces ranging from 30 tons to 4000 tons. The 4-cavity preform mold typically operates in the 200–600 ton range, and our validation machines replicate your production conditions exactly. The all‑electric drive delivers repeatable accuracy of ±0.1% , meaning that when you receive your mold, the first shot and the millionth shot will be indistinguishable.
We run every 4-cavity mold through real‑production validation cycles on our machines, measuring filling balance, cooling uniformity, and ejection consistency. This eliminates the trial‑and‑error debugging that so often delays production ramp‑up.
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Metrology and Quality Assurance Equipment
Every 4-cavity mold leaving our facility is accompanied by a full dimensional inspection report. Our CMM (Coordinate Measuring Machine) and optical vision measurement systems verify every critical dimension—from the core diameter to the cavity depth, thread profile, and gate position. For PET preforms destined for carbonated soft drinks (CSD) or hot‑fill applications, we routinely ensure key dimension CPK ≥ 1.33, a statistical guarantee that your process will run within spec across millions of cycles. We also perform micro‑hardness testing on each heat‑treated component, with full traceability to material certificates.
II. Mold Manufacturing Excellence – Where Capabilities Become Tangible Value
The gap between a functional mold and a high‑performance mold lies in the details. At Ansix Tech, every design decision, material selection, and process parameter is optimized for one goal: maximizing your production uptime and minimizing your cost per preform.
Material Selection – Matching Steel to Your Application
PET is an inherently challenging polymer—it is hygroscopic, prone to hydrolysis, and requires aggressive cooling. Our material strategy is founded on decades of empirical knowledge:
Component Material Grade Hardness (HRC) Value to You
Mold Base P20 (pre‑hardened) 30–36 Stable dimensions, easy machining, cost‑effective for frame
Core & Cavity S136 stainless 48–52 Exceptional corrosion resistance, mirror polish (ideal for transparent preforms), resists IV degradation
High‑wear components H13 / 8407 / SKD61 48–52 Superior heat resistance and toughness, withstands high shot counts
Neck thread splits 2316 / 4Cr13 45–48 Maintains thread integrity under repeated cycling
Special applications NAK80 / 2344 / DC53 / M340 / 9Cr18 Varies Pre‑hardened, excellent machinability, good wear resistance
For glass‑fiber reinforced PET (GF‑PET) , we guarantee 500,000 cycles before any significant wear; for standard PET applications, the mold life extends to over 1 million cycles . Every mold is accompanied by a steel material certificate and the full heat treatment curve to ensure traceability and process repeatability.
Mold Types for PET Preform Applications
We design and manufacture a full range of PET preform mold configurations:
Hot runner valve‑gate molds – Eliminates material waste from cold runner tails, reduces cycle time, and prevents gate blush. Each cavity features independent temperature control and heater systems, which prevent white defects and improve preform quality. Advanced hot runner systems assure a low AA (acetaldehyde) level—critical for beverage applications where taste neutrality is paramount.
Stack molds – For high‑output applications where machine tie‑bar spacing is a constraint. Stack molds effectively double the number of cavities per machine cycle.
Multi‑material / co‑injection molds – For barrier layer applications (e.g., oxygen‑scavenging PET) and recycled content (rPET) integration.
Precision Tolerances That Eliminate Defects
In a 4‑cavity mold, cavity‑to‑cavity consistency is everything. Our standard achievable tolerances:
General structural features – ±0.05mm
Neck finish dimensions (threads) – ±0.02mm
Gate location and diameter – ±0.01mm
Preform weight variation across 4 cavities – ≤ 0.5%
Our double‑cone positioning system and independent self‑locking per cavity guarantee that the plastic thickness variation across preforms is maintained below 0.10mm. Off‑center adjustment systems ensure that concentricity between core and cavity is precise, preventing wall thickness differences that lead to blow molding failures.
Gate and Runner Optimization via Moldflow Analysis
Before cutting a single piece of steel, we perform comprehensive Moldflow simulation on every 4-cavity preform project. Our engineers use simulation to:
Predict weld line positions – Especially critical when using recycled PET (rPET) content or color masterbatches. We reposition gates to move weld lines into non‑critical areas of the preform.
Identify air trap locations – By analyzing the fill pattern, we design vent depths (typically ≤ 0.03mm to prevent flash) exactly where trapped air would otherwise cause burn marks or incomplete filling.
Optimize gate number and location – The 4-cavity layout must fill perfectly balanced. Our simulations ensure that all four cavities fill simultaneously with identical pressure and temperature profiles, eliminating shot‑to‑shot weight variation.
Short shot prevention – Analysis verifies that injection pressure and speed profiles will completely fill all four cavities before the melt freezes. PET has a narrow processing window, and our simulations guarantee robust filling.
Cooling System Design – The Hidden Driver of Productivity
PET preform cooling accounts for 50–70% of the total cycle time. Our 4-cavity molds incorporate aggressive, scientifically designed cooling systems:
Spiral turbulent cooling channels within each core and cavity maximize heat transfer. Turbulent flow, even at moderate flow rates, removes heat far more efficiently than laminar flow, reducing cooling time by up to 30%.
Gate area cooling – The gate region experiences the highest melt temperatures. Our design aggressively cools the gate to minimize crystallinity in this area, which preserves preform clarity and prevents gate breakage during ejection.
Independent zone control – We use multi‑zone water manifolds with temperature sensors, allowing precise control of cooling across the cavity, neck thread splits, and core. Temperature differences between core and cavity are maintained within 2℃ , eliminating warpage and differential shrinkage.
High‑conductivity steel – For cores and cavities, we specify steels with high thermal diffusivity, moving heat away from the plastic rapidly and evenly.
The result: cycle times as low as 10–12 seconds for lighter preforms (15–20g) and optimized cooling for heavier grades, directly translating into higher hourly output from your injection molding machine.
Ejection System – Simple, Reliable, and Low‑Maintenance
Our 4-cavity preform molds use stripper plate ejection with a pressure synchronization system that holds pressure while simultaneously charging for the next cycle, boosting productivity by 20–25%. Thread splits are manufactured from corrosion‑resistant steel and are replaceable without removing the mold from the machine. All sliding surfaces are inlaid with self‑lubricating copper alloys, ensuring low friction, wear resistance, and maintenance‑free operation over millions of cycles.
III. Process Control and Quality Assurance – Eliminating Customer Anxiety
Your greatest fear as a PET preform producer is variability: preforms that differ in weight from cavity to cavity, dimensions that drift over a production run, surface defects that cause blow molding rejects, and flash that requires expensive post‑molding trimming. At Ansix Tech, we have engineered our quality systems to directly address each of these concerns.
Why Preform Defects Occur and How We Prevent Them
PET injection molding is notoriously sensitive. The most common defects and their root causes are well understood:
Defect Primary Cause Consequence
Short shots Insufficient injection pressure, blocked venting, low melt temperature Incomplete preforms, underweight, bottle collapse during blow molding
Flash Excessive injection pressure, misaligned mold halves, worn parting line Trim waste, increased rejection rates, downtime for flash removal
Bubbles / Voids Moisture in resin (PET is hygroscopic), trapped air Weak spots, leakage after blow molding, reduced top‑load strength
Haze / Opacity Improper drying, temperature imbalance, inadequate cooling Poor clarity, reduced shelf appeal, customer rejection
Black specks Contaminated resin, degraded material, dirty mold surfaces Visual rejection, contamination risk, batch scrapping
Crystallization whitening Insufficient drying, low hot runner/nozzle temperature Cloudy appearance, compromised transparency
Uneven wall thickness Eccentric gate, misaligned core/cavity, poor mold quality Bottle blow molding failures, inconsistent material distribution
Sink marks High material temperature, short hold time, insufficient cooling Surface depressions, aesthetic defects, weak spots
Our entire manufacturing and process control system is designed to prevent these defects from ever reaching your production line.
Process Standardization – Locking in Consistency
Every injection molding machine in our validation lab is networked and monitored through an MES (Manufacturing Execution System). All critical process parameters—temperature, pressure, injection speed, hold time, cooling time—are locked into recipe files that can only be modified by authorized engineers. Each production batch begins and ends with first‑article and last‑article inspection, and the results are archived for full traceability. This ensures that when we hand over the mold and its validated process window, you can replicate the results on your own machine without guesswork.
Dimension Stability Control
We use multi‑zone mold temperature controllers to maintain core and cavity temperatures within 2℃ of each other. This eliminates the differential shrinkage that causes warpage and inconsistent neck finish dimensions. For a typical beverage preform, our data shows that key hole‑to‑hole spacing across three consecutive production batches varies by ≤ 0.02mm —a level of consistency that eliminates downstream assembly issues.
Appearance and Surface Quality
PET preforms are aesthetic products—clarity and gloss are often as important as dimensional accuracy. Our 4-cavity molds routinely achieve:
Mirror polish (Ra ≤ 0.02μm) on cavity and core surfaces, using S136 stainless steel with super‑fine polishing
Bubble‑free, flow‑mark‑free preform surfaces, verified through optical inspection under polarized light
Flash‑free parting lines, with mold fit tolerances held to 0.005mm
For customers requiring hot‑fill applications, we add thermal expansion compensation into the mold design, ensuring that when the mold reaches operating temperature, dimensions are exactly at nominal.
Capability to Process Specialty Materials
PET preforms are our core competency, but our expertise extends far beyond. Our 4-cavity platforms are validated for:
Standard PET – Including rPET blends (recycled content up to 50–100% with appropriate process adjustments)
Glass‑fiber reinforced PET (GF‑PET) – With wear‑resistant steel upgrades
Tritan™ (Eastman copolyester) – For reusable water bottles
PP and HDPE – For alternative preform applications
PC and ABS – For specialty packaging
We have successfully delivered molds for PC/ABS, PC, PPS+40%GF, PEEK, PTFE/PFA, PA6+GF30, PBT, PEI, LCP, and LSR (liquid silicone rubber) . For projects requiring UL94 V‑0 flame ratings or UV stability (3000 hours without discoloration), we design accordingly.
In‑Process and Final Quality Verification
Our quality assurance protocol for every 4-cavity mold includes:
Raw material verification – Steel mill certificates, hardness testing, microstructure inspection
In‑process dimensional checks – At every critical machining stage
Assembly verification – Fit checks, concentricity, ejection smoothness
T0 (first shot) validation – Short shot analysis, weight balance across cavities, visual inspection
T1 through T3 iterations – Corrective adjustments based on actual molding results
2000‑cycle run‑in test – We run each mold for 2000 cycles on our machines to simulate early wear and detect any issues before delivery
Full dimensional report – Every critical dimension measured and reported
CPK analysis – Key dimensions guaranteed at CPK ≥ 1.33
IV. Full‑Service Partnership – Reducing Your Management Overhead
When you source a 4-cavity preform mold from Ansix Tech, you are not buying a product—you are buying a seamless, low‑risk path to profitable production. Our service model is designed to reduce your internal management costs and eliminate the friction of coordinating multiple suppliers.
Early Engagement – DFM (Design for Manufacturability) Report
Before you commit to mold construction, our engineering team provides a comprehensive DFM (Design for Manufacturability) report that includes:
Moldability assessment – Does the preform design allow uniform filling, cooling, and ejection?
Wall thickness optimization – Recommendations to balance blow ratio and minimize injection cycle time
Draft angle suggestions – Ensuring clean ejection without surface drag marks
Gate location and type – Hot runner valve gate positioned for best aesthetics and gate break quality
Ejector pin mark locations – We identify where ejector marks will appear and obtain your approval
Shrinkage compensation – PET shrinks differently in flow direction vs. transverse direction; we incorporate compensation factors to ensure final blow molded bottle dimensions are correct
This DFM process typically eliminates 2–3 design iterations that would otherwise occur after tooling has started, saving you weeks of delay and thousands of dollars in rework.
Prototyping and Sample Validation
For critical projects, we offer rapid prototyping of the preform geometry using additive manufacturing. This allows you to blow‑mold prototypes and validate bottle performance before the steel is cut.
During the mold build, we provide T0, T1, T2, and T3 samples—samples from each trial shot—accompanied by a detailed correction report explaining what was observed and what was changed. This transparency builds trust and allows you to track progress without needing to be physically present in our factory.
Pilot Production – Low‑Risk Ramp‑Up
Before committing to full production, we offer a pilot run of 100–500 shots under your exact production conditions (either at your facility or simulated in our lab). During this pilot, we statistically verify the yield and CPK. Only when you are satisfied that the mold is stable do we transition to full commercial production. This eliminates the risk of discovering problems only after you have paid in full and installed the mold.
Mold Maintenance and Lifecycle Management
Mold maintenance is often an afterthought—until an unexpected failure shuts down your production line. We build longevity into every mold and support it throughout its life:
Spare wear parts (ejector pins, core pins, thread inserts, heaters, thermocouples) are delivered with the mold so you have immediate replacements
Preventive maintenance schedule – A detailed maintenance manual provided with every mold
Recommended service intervals – We recommend inspection and cleaning at 200,000‑cycle intervals
Lifetime repair services – We maintain CNC and EDM equipment capable of performing repairs in‑house. Typical repairs (weld repair and re‑machining of a damaged core or cavity) can be completed within 24 hours and shipped back to you. Post‑warranty service is billed at cost, not at premium rates
Technical support – Our engineers are available for remote diagnostics and, if necessary, on‑site assistance during mold commissioning
V. Differentiated Value – Turning Common Customer Complaints into Guarantees
The mold manufacturing industry has a reputation for unpredictable quality, late deliveries, and hidden costs. At Ansix Tech, we systematically address the most frequent customer complaints and eliminate them through specific, verifiable commitments.
Complaint 1: “The mold needs repairs constantly, disrupting our production.”
Our guarantee – Every 4-cavity mold undergoes a 2000‑cycle run‑in test on our injection molding machines before shipment. We provide a wear report documenting the condition of each core, cavity, and thread split after run‑in. We further offer a three‑year structural warranty (excluding normal wear parts) that covers defects in materials or workmanship. Many of our customers report over 2 million cycles on their Ansix molds with only routine maintenance.
Complaint 2: “Preforms come out with excessive flash, requiring costly manual trimming.”
Our guarantee – We machine parting lines to a fit accuracy of 0.005mm. Our injection molding process validation confirms that flash is controlled below 0.03mm across all four cavities. At this level, no secondary trimming is required. Flash that does appear is barely visible and does not interfere with downstream blow molding or handling.
Complaint 3: “Dimensions change from batch to batch. Production is never consistent.”
Our guarantee – Our validation machines are equipped with ultrasonic wall thickness sensors that provide real‑time feedback during the molding process. We also offer the option of integrating in‑mold temperature and pressure sensors with closed‑loop control, so your production machine automatically compensates for melt temperature or viscosity variations. With these systems, dimensional variations are reduced to levels that are statistically indistinguishable from one batch to the next.
Complaint 4: “Mold repairs take weeks. Every downtime day costs us a fortune.”
Our guarantee – We have in‑house electrode machining centers and an EDM department dedicated to repair work. For common repairs—welding a damaged core or replacing a worn insert—the repair is typically completed within 24 hours and shipped the same day. We do not outsource repairs to third parties who add lead time and mark up prices. If your production line is down, we move mountains to get you back online.
Complaint 5: “I never know if the mold will run right the first time. I’ve been burned before.”
Our guarantee – Your mold is debugged on our machines before it leaves our factory. We provide a validated process parameter sheet that you can load directly into your own machine. The mold arrives ready to run—no trial‑and‑error, no weeks of process development. We call this “plug and produce.”
Complaint 6: “The mold cost was low, but the hidden costs ate my profits.”
Our transparency – We itemize every component, every process step, and every validation test in our quotation. There are no hidden charges for “urgent shipping” or “surprise rework.” Our cost advantage comes from engineering efficiency and lean manufacturing—not from cutting corners on quality. Our integrated factory (design, CNC machining, heat treatment, EDM, assembly, and validation all under one roof) eliminates the costs and delays of outsourcing.
VI. Case in Point – A 4‑Cavity PET Preform Mold for Mineral Water Bottles
To illustrate our capabilities in concrete terms, consider a typical project: A mid‑size beverage company required a 4‑cavity PET preform mold for 0.5L mineral water bottles, targeting a preform weight of 18g and a PCO 1881 neck finish. Annual volume was 20 million preforms, requiring a reliable, high‑uptime solution.
What Ansix Tech Delivered
Mold configuration – 4‑cavity hot runner valve gate mold
Steel specification – P20 mold base (HRC 30–35), S136 cores and cavities (HRC 48–52), 2316 thread splits
Processing parameters – Drying at 170℃ for 4 hours, melt temperature 280–295℃, injection time 2.5 seconds, cooling time 8 seconds, total cycle time 13 seconds
Validation results – Weight variation across cavities ≤ 0.3%, neck finish dimensions within ±0.02mm, flash ≤ 0.02mm, preform clarity (haze) < 2%, AA level < 3 ppm (suitable for sensitive taste applications)
Run‑in test – 2000 cycles with no detectable wear or dimensional drift
Delivered lead time – 35 days from DFM approval to shipment
The Customer’s Realized Value
Annual throughput – Approximately 1.8 million preforms per 24‑hour production day (based on 13‑second cycle × 4 cavities × 3600 seconds per hour × 24 hours)
Material savings – Hot runner valve gate eliminated all runner waste compared to cold runner molds, saving approximately 0.8g of PET per shot (× 4 cavities × millions of cycles = significant resin cost reduction)
Energy efficiency – Optimized cooling allowed the customer to operate their chiller at 8–10℃ instead of 4–6℃, reducing refrigeration energy consumption by 15%
Maintenance cost – After 2 million cycles, the only required maintenance was replacement of valve gate needles (standard wear items) at 20% of the cost of a competitor’s mold
Downtime reduction – The validated process parameters loaded directly into the customer’s machine eliminated the typical 2‑week debugging period, generating revenue earlier and reducing scrap during startup
VII. Cost Control – Engineering Savings, Not Cutting Corners
The most meaningful cost control is the kind that does not compromise quality. At Ansix Tech, we achieve a lower total cost of ownership through:
Material Optimization
Preform weight reduction – Our Moldflow‑guided design minimizes wall thickness in non‑critical areas without compromising top‑load strength, saving 2–5% of resin cost per preform
Regrind and recycled content compatibility – We design runner and gate systems that accommodate up to 25–50% rPET without degradation of preform clarity or mechanical properties, reducing raw material expenses
Hot runner efficiency – Our valve gate systems produce tail‑free preforms, eliminating the 1–2g per shot waste of cold runner systems
Process Efficiency
Cycle time reduction – Aggressive cooling system design cuts cooling time by 20–30%, directly increasing hourly output and reducing machine‑hour costs
Energy conservation – Our cooling channels are designed for turbulent flow at minimum flow rates, requiring a smaller, lower‑power chilled water pump. The lower pressure drop in water distribution channels reduces pump energy consumption
Shorter mold changeover – Our molds are designed for quick coupling connectors and standardized interfaces, reducing mold change time from hours to minutes
Operational Efficiency
Reduced scrap rates – Consistent cavity‑to‑cavity filling and cooling keep first‑pass yield > 98% for most applications
Lower maintenance costs – Replaceable wear parts (cavity lock rings, core lock rings) cost a fraction of replacing entire core/cavity assemblies
Less inventory – Standardization of components across multiple molds reduces spare parts inventory requirements
Manufacturing Efficiency
Integrated production – With CNC machining, EDM, heat treatment, assembly, and validation all under one roof, we eliminate the markups and logistical delays of outsourcing
Lean manufacturing – We maintain a dedicated electrode machining center and spare parts inventory so that repairs can be completed in‑house within hours, not weeks
Quality‑first design – By getting the design right the first time (through DFM and Moldflow), we avoid costly rework that so often plagues the mold industry
VIII. Closing Message – A Mold Is Not Just Steel. It’s Your Revenue Engine.
At Ansix Tech, we believe that a 4‑cavity PET preform mold is not a piece of equipment—it is a profit center. When we design your mold, we are simultaneously designing for rheological balance, thermal efficiency, venting strategy, and ejection reliability. The result is a mold that arrives at your factory ready to run, delivers flash‑free, dimensionally consistent preforms from the first shot, and continues to do so for millions of cycles with minimal intervention.
We invite you to experience the difference. Send us your preform drawing or sample. We will provide a comprehensive DFM report and a detailed quotation within 48 hours. We will walk you through how we plan to address your specific challenges—whether it is eliminating weld lines, preventing gate blush, reducing cycle time, or maximizing recycled content. With over 28 years of experience and a relentless focus on customer value, Ansix Tech is the partner you need to succeed in the competitive PET packaging industry.
Contact Ansix Tech today. Let’s turn your preform production from a cost center into a competitive advantage.
Ansix Tech Co Ltd
If you have any plans related to 4-cavity PET preform mold , you can contact us at any time. We will turn your ideas into reality, let you realize your dreams, and obtain large orders from the market. Our contact information is info@ansixtech.com. Or contact our CTO, mail: stephen@ansixtech.com
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