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中文简体38mm Pulsating Mouth PET Beverage Preform Wholesale Supplier
Polyethylene Terephthalate (PET) has become one of the popular materials used for producing plastic bottles and containers due to its strength, lightweight nature, and barrier properties. The 38mm PET preform is a key component in the production of PET bottles, used across a variety of industries such as beverage packaging, pharmaceuticals, and cosmetics. This article explores the 38mm PET preform process, shedding light on the steps involved in manufacturing this essential product, its applications, and the technological innovations that make it an integral part of modern bottle production.
The 38mm PET preform refers specifically to the size of the neck opening, which is designed to accommodate bottle caps with a 38mm diameter. This size is widely used in various industries, especially for carbonated soft drinks, juices, and water bottles. The production of PET preforms is a crucial part of the manufacturing chain for these types of products.
The 38mm PET Preform Process
The process of creating a 38mm PET preform involves several key stages, from material selection to molding and cooling. Here’s a breakdown of the key steps in the 38mm PET preform production process:
1. Material Selection
The step in the process is selecting the right grade of PET resin. PET resin is available in both virgin and recycled forms. The choice of material depends on the intended use of the final product, with virgin PET being commonly used for food and beverage containers due to its higher purity and safety standards.
The resin typically comes in the form of small pellets, which are melted and processed during the injection molding stage. It is important to ensure that the resin has the right properties for molding, as it needs to be malleable yet durable enough to withstand the final stretching and blowing processes.
2. Injection Molding
The core of the PET preform process is injection molding, where the PET resin is melted and injected into a mold to form the preform shape. In the case of the 38mm PET preform, the mold is specifically designed to produce a preform with a neck size of 38mm, which is compatible with the standard bottle cap size.
In the injection molding machine, the PET resin is heated to its melting point, after which it is injected under high pressure into a precisely designed mold cavity. The mold includes a cavity that forms the body of the preform, as well as a smaller section that forms the neck. Once the mold is filled, it is cooled quickly to solidify the material. The mold is then opened, and the PET preform is ejected.
3. Quality Control and Inspection
Once the preforms are molded, they undergo strict quality control procedures to ensure consistency and to meet the required specifications. The 38mm preform must have uniform thickness, a precise neck finish, and the appropriate dimensions to fit the cap correctly.
To inspect the preforms, manufacturers typically use a combination of visual checks and automated equipment such as laser measurement systems or electronic calipers. Preforms that do not meet the standards are discarded or recycled.
4. Stretch Blow Molding
The next step in the process is stretch blow molding. After the preforms are produced, they are reheated to a temperature that makes them pliable but not fully molten. In the stretch blow molding machine, the preform is clamped into a mold and subjected to two main actions: stretching and blowing.
Stretching: The preform is stretched vertically by a rod that pushes the bottom of the preform downward while the top is held in place. This stretching action elongates the preform and aligns the polymer molecules, giving the final bottle its strength.
Blowing: Simultaneously, air is injected into the preform, causing it to expand and take the shape of the mold. This creates the final shape of the bottle, with the neck size remaining at 38mm to fit the corresponding cap. The stretch-blown bottle is then cooled and ejected from the mold.
