Choosing preforms for blowing plastic bottles is a critical task for enterprises that manufacture or bottle products. A PET preform must match the volume of the future bottle, the type of contents, and the requirements of the production line. It is important to choose it correctly, as this determines the quality of the finished packaging, the stability of the blowing equipment, and the optimization of production costs.
Contents
Choosing preforms for blowing plastic bottles is a critical task for enterprises that manufacture or bottle products. A PET preform must match the volume of the future bottle, the type of contents, and the requirements of the production line. It is important to choose it correctly, as this determines the quality of the finished packaging, the stability of the blowing equipment, and the optimization of production costs.
What is a PET preform
Plastic bottles are the most popular type of packaging for various liquids: food, technical, and industrial. PET preforms are used for their production – these are molded blanks made of polyethylene terephthalate with a formed neck.
Preforms are used to manufacture packaging for various purposes:
- ✅ water and beverages;
- ✅ dairy products;
- ✅ vegetable oils;
- ✅ household chemicals;
- ✅ technical liquids.
Depending on the contents, the requirements for weight, neck type, and container wall thickness may vary. These parameters are ensured by the characteristics of the bottle preforms, which are set during their manufacturing stage. Therefore, when ordering, it is necessary to clarify the properties of the blanks.
What preform parameters should be considered
Preforms for blowing plastic bottles are manufactured in a wide range. When figuring out how to choose a preform, you should pay attention to the characteristics that affect the quality of the finished products:
- ✅ Neck type. It can vary in diameter and thread features. The most popular ones used for water preforms are: PCO 1810 (standard thread, suitable for 0.5-3 liter bottles), PCO 1881 (short thread), Bericap (48 mm diameter, suitable for 5-10 liter carboys).
- ✅ Application area: for food products, oils, pressurized beverages, technical liquids.
- ✅ Color. Preforms can be transparent, matte, or colored. Dark and matte ones are used for products sensitive to sunlight.
- ✅ Weight of the PET preform. This parameter affects the strength of the finished product, the resistance of the walls to internal pressure, the rigidity of the packaging, and the cost.
In addition to considering the main characteristics, it is important to understand their differences and the purpose of blanks for containers of different sizes.
How to choose a preform for bottles of different volumes
Bottle preforms are produced in a variety of types. They differ in weight and size, and these properties determine the type of container they are intended for.
For 0.33-0.5 liter bottles
Small beverage preforms are primarily used to manufacture PET containers for drinking water, sweet carbonated drinks, juices, and iced tea, as well as technical liquids and household chemicals.
For 1 liter bottles
Such containers are used for bottling water, juices, dairy products, carbonated drinks, vegetable oils, and household chemicals. When choosing, the following preform standards should be considered:
- ✅ PCO 1810 or 1881 neck;
- ✅ weight 18-28 g;
- ✅ height 135-180 mm;
- ✅ diameter 22-26 mm.
A properly selected preform ensures uniform material distribution during blowing and optimal rigidity of the PET packaging.
For 1.5-2 liter bottles
Such containers are used for bottling water, beverages, oils, kvass, and beer. They are subjected to higher mechanical loads during transportation, storage, and use, so it is recommended to choose heavier blanks (28-42 g) to ensure optimal wall rigidity.
For 5-6 liter bottles
For their production, PET blanks of increased weight (65-90 g) are used and manufactured from a material with increased viscosity to ensure strength. Such preforms are designed for high pressure and the formation of containers with a reinforced bottom and ribs. They usually feature a wide neck (Bericap 48 mm standard). Accordingly, PET caps for such containers also need to be of a larger diameter, and they can also be ordered on our website.
For 18.9 liter carboys
Preforms for 18.9 liter carboys are made from high-viscosity PET. They have a significant weight and a reinforced wall structure for uniform material distribution during blowing. Special attention is paid to the quality of the neck and the stability of the geometry, as the carboys are intended for frequent reuse.
Why it is profitable to order preforms directly from the manufacturer
The requirements for PET blanks are strict. Only the manufacturer can guaranteedly ensure the compliance of the blanks with the standards. The «Zavod Preform» company manufactures all in-demand types of PET preforms in a range of sizes. Flexible production makes it possible to provide branding and custom manufacturing services. Certified raw materials standardized for use in the food industry are used for production.