Exploring the Different Types of 28mm PET Preforms

Polyethylene Terephthalate (PET) is a widely used thermoplastic material known for its strength, durability, and clarity. PET preforms are molded products that serve as the starting point for creating PET bottles, containers, and other packaging solutions. The 28mm PET preform is one of the common types used in the packaging industry, particularly for beverage bottles. These preforms are characterized by their neck finish, which measures 28mm in diameter, and are essential for producing containers with secure, functional closures.

28mm PET Preforms

Standard 28mm PET Preform

The common type of 28mm PET preform is the standard preform, which is designed to be used with a corresponding 28mm cap. These preforms have a simple, cylindrical neck design with a basic threading pattern to fit standard bottle caps. They are widely used in the beverage industry, particularly for bottled water, soft drinks, and juices. The versatility and cost-effectiveness of the standard 28mm PET preform make it the go-to option for many packaging applications.

One key characteristic of the standard 28mm PET preform is that it is designed for relatively low-pressure contents, as the bottle's shape and neck finish are optimized for ease of sealing and high-volume production. They are particularly favored in high-speed bottling operations due to their simple design and compatibility with a wide range of production lines.

28mm PET Preform with ROPP (Roll-on Pilfer Proof) Neck Finish

Another variant of the 28mm PET preform is the ROP (Roll-on Pilfer Proof) neck preform, which is designed for use with specialized caps that have a liner and are sealed by a rolling process. The ROPP cap provides a tamper-evident feature, making it suitable for products that require an added layer of security. These preforms are commonly used in the wine, spirits, and pharmaceutical industries, where maintaining the integrity of the product is critical.

The main difference between the ROPP-style preform and a standard preform is the design of the neck. The neck finish of the ROPP preform is slightly different in shape to accommodate the specific sealing process, and it requires a specialized capping machine to apply the tamper-evident closure.

28mm PET Preform with CRC (Continuous Thread Closure)

The CRC (Continuous Thread Closure) version of the 28mm PET preform is designed to accommodate bottle caps with a continuous thread design. This type of cap is often used for products that require frequent opening and resealing, such as sauces, oils, and other food products. The continuous thread ensures a secure seal, preventing leakage and maintaining the freshness of the contents.

The CRC neck finish on the 28mm PET preform is tailored for compatibility with screw-on caps, which are applied and tightened during the packaging process. This design ensures a tight seal that can withstand pressure and temperature fluctuations, making it ideal for a variety of food and beverage packaging applications.

28mm PET Preform with Wide Mouth Design

The wide-mouth 28mm PET preform is specifically designed for packaging thicker liquids or products that require a larger opening. This type of preform features a neck that is wider than the standard 28mm neck, allowing for easier pouring and filling of products like condiments, honey, sauces, and even dry foods such as spices and snacks.

Wide-mouth 28mm PET preforms are also popular in the pharmaceutical and healthcare industries for packaging products like over-the-counter medicines, vitamins, and supplements. The wide opening makes it easier to dispense or pour the contents, and it also allows for a larger cap design for ease of use by consumers.