28mm 1881 PET Preform for Mineral Water & Carbonated Soft Drinks – 14g to 46g

1. Product Details

1.1 Product Definition & Design Standards

The 28mm 1881 PET Preform is an injection-molded semi-finished product designed specifically for stretch blow molding into disposable bottles for mineral water and carbonated soft drinks (CSD). The designation "1881" refers to a globally standardized neck finish profile, governed by international beverage closure system specifications. This standard ensures seamless compatibility across different cap manufacturers and filling line OEMs worldwide.

The preform is engineered to produce bottles ranging from 330ml to 2.0L in volume, with the same 28mm neck opening. This means bottling plants can run a single cap specification across an entire product portfolio -- from small-format water bottles to large-format CSD containers -- reducing cap inventory complexity and simplifying filling line changeover.

1.2 Weight Range Logic & Application Mapping

Preform weight determines the wall thickness distribution of the final blown bottle, which directly governs the bottle's mechanical strength, gas barrier retention, and perceived quality. Our 14g-46g range follows a deliberate logic:

Lightweight Water Grade (14g-19g)

• Designed for non-pressurized still water applications

• Optimized minimal gram weight for cost efficiency while maintaining structural integrity

• Suitable bottle volumes: 300ml - 550ml

Mid-Range Dual-Purpose Grade (21g-25g)

• Engineered for still water and lightly carbonated beverages

• Balanced between material savings and burst strength margins

• Suitable bottle volumes: 600ml - 1.0L

Heavy CSD Grade (28g-46g)

• Purpose-built for carbonated soft drinks requiring high internal pressure resistance

• Extra wall thickness ensures CO₂ retention over shelf life and resistance to burst

• The 46g variant is engineered for maximum strength in 2.0L heavy CSD applications

28mm 1881 Preform Specification Table

1.3 Neck Finish Deep-Dive: 28mm 1881

The 28mm 1881 neck finish is one of the most widely adopted standards in the global beverage industry. Understanding its features helps explain universal compatibility:

• Thread Profile : The 1881 specification defines precise thread pitch, depth, and helix angle. This ensures caps achieve correct application torque and reliable seal compression on any 1881-compliant bottle, regardless of preform source.
  

• Tamper-Evident Band Retention : The lower neck portion includes a precise retention bead profile that securely engages standard tamper-evident (TE) bands, providing visible evidence of first opening.
  

• Sealing Surface : The top sealing surface is molded with precise flatness and surface finish, critical for achieving a hermetic seal with liner-type closures or linerless cap designs.
  

1.4 Material Science & Intrinsic Viscosity (IV)

PET resin quality is fundamentally measured by Intrinsic Viscosity (IV), which reflects the average polymer chain length and directly correlates with mechanical strength and gas barrier properties:

• Standard IV Range : Our preforms are produced using virgin PET with controlled IV values optimized for both water (lower IV acceptable) and CSD (higher IV required for burst resistance).

• IV Retention During Processing : Each thermal cycle in drying and injection molding causes some IV loss (chain degradation). Our automated closed-loop drying and conveying system minimizes this degradation by precisely controlling temperature, residence time, and dew point, preserving the resin's original mechanical properties.

1.5 Product Safety & Food Contact Compliance

Acetaldehyde (AA) Control
Acetaldehyde is a naturally occurring by-product of PET processing. Even at trace levels, elevated AA can migrate into the beverage and alter taste, which is particularly critical for water (no flavor masking) and sensitive formulations. Our process parameters and IV-managed resin sourcing are optimized to keep AA levels below industry thresholds, ensuring neutral taste profiles for bottled water applications.

Food-Grade Certification
All raw materials used are certified food-contact grade by the resin suppliers, with documentation traceable to each production lot.

1.6 Customization Options

Beyond the standard specification table, we offer the following customization paths:

Custom Gram Weights
A specific gram weight not listed in the table can be developed to match your exact bottle volume and performance requirements.

Color Tailoring

• Water Blue : Light tint for brand differentiation and aesthetic appeal

• CSD Green : Classic green tint associated with sparkling beverages

• Amber : UV light barrier for light-sensitive products

• All colors use high-quality masterbatch dosed with precision to ensure lot-to-lot color consistency

Special Requirements
Need a different neck finish altogether? As a manufacturer with full-range neck size capability (28mm, 30mm, 38mm, 45mm, 48mm, 55mm and beyond), we can transition discussions to other specifications based on your cap and filling line setup.

2. Manufacturing & Quality Control

25 Years of Expertise, Built into Every Preform

100% Virgin Food-Grade PET Resin

We use only brand-new virgin PET resin sourced from leading petrochemical suppliers. Every incoming raw material lot is inspected for intrinsic viscosity (IV), color values and contamination before entering production. No recycled or off-grade materials --- guaranteed.

Advanced Injection Molding with Full-Range Neck Capability

Production runs on high-precision injection molding lines equipped with multi-cavity molds. As a specialist with a full range of neck sizes --- 28mm, 30mm, 38mm, 45mm, 48mm, 55mm and more --- we deeply understand the relationship between preform design, IV retention and final bottle performance. Our automated material drying and conveying system ensures minimal IV drop during processing, resulting in excellent burst strength for carbonated drink applications.

Inline Inspection & Lab Testing

Every preform passes through online vision systems that detect black spots, bubbles, short shots and weight deviations. Our in-house lab conducts periodic sampling for:

• Cavity-by-cavity weight and dimension checks

• Acetaldehyde (AA) level testing

• Burst pressure and drop impact tests

• Section weight distribution analysis

Any batch that fails is quarantined. Full batch traceability is maintained from raw material lot to final shipment.

Controlled Environment & Export Packaging

Production takes place in a dust-controlled workshop. Preforms are automatically packed in sealed PE liner bags with moisture indicators, then placed into reinforced export-grade cartons designed to withstand long-distance ocean freight.

Result: Consistently high blow-molding success rates, fewer line stoppages for your filling plant.

3. Company Profile

Taizhou Huangyan Jinting Plastic Mold Co., Ltd. is a professional PET preform manufacturer rooted in Huangyan District, Taizhou City, Zhejiang Province --- widely recognized as China's "Hometown of Plastics" and a global hub for plastic products manufacturing. Growing up in this rich industrial ecosystem, Jinting has accumulated over 25 years of specialized experience in PET preform development and production.

What We Do

We are more than just a preform producer. We offer an integrated supply solution covering:

• PET Preforms: Full range of neck sizes --- 28mm, 30mm, 38mm, 45mm, 48mm, 55mm and more, in weights spanning from lightweight water-grade preforms to heavy CSD and 5-gallon bottle preforms.

• Bottles: We blow finished water bottles from 200ml up to 5-gallon sizes, allowing us to test our own preforms and understand exactly what blowing performance customers need.

• Closures & Handles: PE caps, ABS handles, and PE handles --- because a preform is only as good as the closure system it works with.

Company Facts

Our Mission

"Specializing in manufacturing PET preforms and leading the future of the industry." This is not just a slogan --- it drives us to continuously invest in technology, refine our quality systems, and build long-term partnerships with water plants and beverage brands worldwide.

Customization Capability

We welcome custom requirements ：

• New neck finish design based on your cap samples or drawings

• Custom mold development

• Color matching (using high-quality masterbatch)

• Combined supply of preforms, bottles and matching closures

4. FAQ

Q1: How do you ensure batch-to-batch consistency?
We operate under ISO 9001 and ISO 22000 certified management systems. Quality control starts at raw material incoming inspection, continues through in-process cavity monitoring and automatic vision sorting, and concludes with final lab testing before release. Each batch is fully traceable. With over 25 years of specialization, consistency is the foundation of our reputation.

Q2: Can I get free samples?
Yes. Free samples of standard 28mm 1881 preforms in stock specifications are available. Freight charges are collected. For custom weights, colors or new neck designs, please contact us to discuss sampling terms --- we typically offer reasonable trial support for serious projects.

Q3: What is your minimum order quantity (MOQ)?
Please contact us with your specific requirements. We aim to accommodate both large-volume regular orders and smaller trial quantities for new partnership evaluations.

Q4: What is the delivery time?
Standard lead time depends on order volume and current production schedule. We will confirm an exact delivery date upon receiving your inquiry. Our 20,000+ sqm factory capacity allows us to handle urgent orders efficiently.

Q5: Do you produce other neck sizes and colors?
Absolutely. We manufacture a complete range of PET preform neck sizes --- 28mm, 30mm, 38mm, 45mm, 48mm, 55mm and beyond. Custom colors (e.g., blue tint for water, green for sparkling, amber for UV protection) are also available. Contact us with your specifications.

Q6: Do you only supply preforms, or can you also provide finished bottles and closures?
We offer an integrated solution. Besides preforms of all sizes, we blow finished bottles from 200ml to 5-gallon formats and produce matching PE caps and handles. This combined supply capability simplifies your sourcing and ensures perfect compatibility.

5. Call to Action

Looking for a reliable preform partner with 25+ years of expertise and integrated supply capability? Send us your inquiry today for a quick quote, free samples, or a virtual factory tour.