How is the daily mineral water bottle made?

Mineral water bottles are typically made from PET (Polyethylene Terephthalate) plastic. The manufacturing process includes the following key steps:

1. Raw Material Preparation

The first step involves preparing PET plastic pellets, which are known for their excellent transparency, heat resistance, and mechanical strength, making them ideal for food packaging, such as mineral water bottles.

2. Injection Molding of Preforms

PET pellets are heated and melted, then injected into molds to form preforms. These preforms resemble a smaller version of a bottle, with a thicker bottom and a narrower middle. They will later be stretched and blow-molded into the final shape of the mineral water bottle.

3. Stretch Blow Molding

The preforms are heated and sent to a blow molding machine. Inside the machine, the preforms are first preheated, then stretched, and air is blown into them at high pressure, expanding them to the shape of the mold. This process shapes the bottle and ensures its proper size and thickness.

4. Cooling and Demolding

The newly formed bottles are cooled, typically with air or water, to ensure they retain their shape and strength. Once cooled, they are removed from the mold.

5. Quality Inspection and Packaging

The bottles undergo a series of quality checks, including tests for strength, sealing, and appearance, to ensure they meet production standards. Bottles that pass inspection are sent to the packaging line and prepared for delivery to filling plants.

6. Filling and Capping

At the filling plant, the bottles are washed and disinfected, then filled with purified mineral water. Afterward, the bottles are capped and labeled, completing the final product.

Major PET Manufacturers Overview

1、Yisheng Petrochemical (Hainan Yisheng Petrochemical)

Features: China’s largest supplier of PET bottle-grade resin. Their YS series products, including YS-C01, are known for stable quality, widely used by major beverage brands such as Coca-Cola and PepsiCo.

2、Sanfangxiang Group (Jiangsu Sanfangxiang Group)

Features: High cost-performance ratio, suitable for general beverage packaging, and commonly used by small and medium-sized domestic beverage companies.

3、Far Eastern New Century (FENC)

Features: A global leader in PET production with advanced technology, serving a broad range of international customers.

4、SABIC

Features: A global chemical giant, offering high-end PET raw materials, primarily catering to premium markets and special packaging needs.

These PET raw material manufacturers provide a strong, high-quality foundation for the production of mineral water bottles, ensuring the bottles’ strength, transparency, and durability, supporting highly efficient, automated production processes.