28mm Water Cap Mold

As a specialized mold manufacturer with over [X] years of experience, we offer high‑performance 28mm water cap molds that deliver exceptional precision, durability, and production efficiency. Our molds are designed to meet the demanding requirements of the beverage industry, ensuring flawless caps with every shot.

Key Features

Premium Steel Grades – Manufactured with corrosion‑resistant tool steels (e.g., S136, 2316, or equivalent) for outstanding wear resistance and extended mold life.
Multi‑Cavity Options – Available in 4, 8, 16, 24, or custom cavity counts to match your output targets.
Advanced Hot Runner / Cold Runner – Choose the system that best fits your resin and cycle needs; we optimize gate placement for balanced filling.
Optimized Cooling – Strategically designed cooling channels minimize cycle times while maintaining part dimensional stability.
High‑Precision Machining – CNC, EDM, and wire‑cut processes ensure tight tolerances (±0.01 mm) and superior surface finishes (Ra < 0.8 µm).
Hardened Components – Core and cavity inserts hardened to HRC 48–52 for maximum durability in high‑volume production.
Cap Design Flexibility – Compatible with flat, sports, tamper‑evident, and other 28mm closure styles.

Product Description

28mm Water Cap Mold

High‑Speed, Multi‑Cavity Injection Molding Tool for 28mm & PCO 1881 Closures

Product Overview

The 28mm water cap mold is a high‑performance injection molding tool designed for the production of 28mm screw caps used in mineral water, purified water, spring water, and light beverage bottles. This mold is fully compatible with the PCO 1881 and standard 28mm neck finishes, ensuring leak‑proof sealing and smooth capping on high‑speed filling lines. Engineered for high‑cavity, ultra‑fast production, our 28mm cap molds achieve cycle times as low as 3.5 seconds with consistent tamper‑evident band integrity. Manufactured from premium stainless steels (S136, 2316) with advanced valve‑gate hot runner systems, these molds are built for 5+ million shot life and minimal maintenance, making them ideal for large‑volume beverage producers.

Key Features & Advantages

28mm & PCO 1881 Compatibility Precision‑machined threads and sealing lands fully comply with PCO 1881 and 28mm standards, guaranteeing leak‑proof sealing on standard PET bottle necks. Perfect for still water and light carbonated beverages.

High‑Cavity Configurations Available in 8, 16, 24, 32, 48, and 64 cavities to match any production scale. Achieve output of up to 100,000+ caps per hour with 64‑cavity systems.

Ultra‑Fast Cycle Times Optimized conformal cooling and advanced hot runner technology deliver cycle times as low as 3.5–5.5 seconds, maximizing production efficiency and reducing per‑unit cost.

Tamper‑Evident Band with Frangible Bridges Integrated tamper‑evident band design with precisely controlled frangible bridges ensures consistent break‑away force (5–12 N). Advanced stripping mechanisms guarantee reliable band ejection without deformation.

Lightweighting & Material Savings Optimized cap geometry reduces material consumption while maintaining strength and sealing performance. Compatible with lightweight PP and PE formulations for sustainable packaging.

Superior Wear & Corrosion Resistance Cavities and cores machined from ASSAB S136, 2316, and 2344 (hardened to HRC 48–52) with mirror polishing (Ra ≤ 0.02 μm). Optimal for processing PE and PP with high purity requirements.

Technical Specifications

Parameter	Specification
Mold Type	Injection mold (hot runner / cold runner)
Cavity Count	8 / 16 / 24 / 32 / 48 / 64
Neck Finish	28mm, PCO 1881
Cap Features	Tamper‑evident band, lightweight design
Mold Life	5,000,000+ shots
Cycle Time	3.5 – 5.5 seconds
Precision (Thread / Seal)	±0.005 mm
Cavity / Core Steel	ASSAB S136, 2316, 2344 (HRC 48–52)
Surface Finish	Mirror polish Ra ≤ 0.02 μm
Hot Runner System	YUDO / Mold‑Masters valve‑gate
Applicable Materials	PE, PP, HDPE
Tamper‑Evident Mechanism	Integrated band with frangible bridges
Cooling System	Conformal cooling + spiral baffle
Mold Standard	HASCO, DME, or custom

Engineering & Design for 28mm Water Caps

Moldflow Analysis – We perform detailed Moldflow simulations to optimize gate placement, filling balance, and cooling efficiency for lightweight 28mm caps, ensuring consistent part quality and minimal warpage across all cavities.
Tamper‑Evident Band Optimization – Frangible bridge thickness is precisely controlled via EDM wire cutting to achieve consistent break‑away force. Advanced stripping systems ensure reliable band ejection without deformation.
Thread Precision – Thread profiles are machined with wire EDM and precision grinding to achieve ±0.005 mm accuracy, ensuring perfect sealing compatibility with PET bottle necks.
Lightweighting Design – Our molds are designed to produce caps with reduced material thickness while maintaining structural integrity, helping you lower material costs and improve sustainability.
In‑Mold Pressure & Temperature Monitoring – Optional cavity sensors provide real‑time feedback on filling and packing pressures, enabling full process validation and quality assurance.

Applications

Our 28mm water cap molds are the industry standard for a wide range of applications:

Mineral & Spring Water – Lightweight 28mm PCO caps for still water bottles, optimized for high‑speed filling lines.
Purified & Distilled Water – Standard 28mm caps for home and office water delivery systems.
Carbonated Soft Drinks (CSD) – PCO 1881 caps with high‑strength threads designed to withstand internal pressure and maintain seal integrity.
Juice & Sports Drinks – 28mm caps with tamper‑evident bands for premium beverage packaging.
Value‑Pack & Family‑Size Bottles – 28mm caps for 1L–2L bottles with easy‑grip design.

Customization Services

We offer tailored engineering solutions for your specific 28mm cap requirements:

Custom Cavity Counts – From 8 to 64 cavities, customized to your injection machine capacity and production targets.
Neck Finish Customization – PCO 1881, 28mm, 30/25mm, or custom neck finishes available.
Lightweighting Optimization – Reduce material usage while maintaining strength and seal performance.
Color & Material Options – Compatibility with PE, PP, HDPE, and custom resin formulations.
Tamper‑Evident System Options – Break‑away bands, shrink‑band alignment ridges, or induction‑seal landing zones.
Branding & Logo Integration – Custom cavity engraving for logos, brand names, or date codes.
Validation & Documentation – Full material certifications, dimensional reports (CMM), and process validation protocols.

Quality & Compliance

Quality Assurance

All molds undergo Carl Zeiss CMM inspection to verify thread profiles, band dimensions, and cavity‑to‑cavity consistency to micron‑level accuracy.
Surface roughness testing and high‑magnification visual inspection ensure defect‑free sealing and flow surfaces.
Trial runs are conducted with full part measurement, torque testing, tamper‑evident break‑away force testing, and visual inspection performed before delivery.

Regulatory & Standards Compliance

FDA 21 CFR – Food contact compliance for water and beverage packaging.
EU 10/2011 – European food contact materials regulation.
RoHS & REACH – Full compliance with global environmental substance restrictions.

Warranty & Support

Warranty period – 1 year or 1 million shots (whichever comes first) for material and workmanship defects.
Trial & validation – Full mold validation and process optimization on our production floor.
Technical support – On‑site commissioning, maintenance training, and remote troubleshooting available.
Delivery – Standard molds: 25–40 days; complex high‑cavity molds: 45–70 working days.

Why Choose Our 28mm Water Cap Molds?

Proven High‑Cavity Expertise – Extensive experience in designing and manufacturing 64‑cavity 28mm cap molds for global beverage brands.
Ultra‑Fast Cycle Times – Optimized cooling and hot runner systems deliver 3.5–5.5 second cycle times for maximum production output.
Superior Tamper‑Evident Technology – Precision frangible bridge designs ensure consistent break‑away force and consumer safety.
Lightweighting Expertise – Reduce material usage by up to 15% without compromising cap performance.
Global Trust – Molds deployed in beverage facilities across North America, Europe, Asia, and the Middle East.
End‑to‑End Service – From concept design and flow simulation to qualification and lifetime maintenance support.

Start Your 28mm Water Cap Mold Project

Share your cap design, neck finish, and production requirements. Our engineering team will prepare a tailored proposal with design optimization, cycle time estimates, and a firm delivery schedule.