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Blow Molding machines are versatile equipment designed to manufacture hollow plastic products, primarily bottles, using thermoplastic materials such as PET, HDPE, or PP. The range of bottle sizes a blow molding machine can handle depends on the type of machine, mold design, and production requirements. Understanding these capabilities helps manufacturers choose the right machine for beverage, chemical, and cosmetic packaging applications.
A standard blow molding machine can produce bottles ranging from 50 ml to 20 liters, depending on the configuration. The most common bottle sizes are between 250 ml and 2 liters, widely used in the beverage and household industries. Advanced models are designed for larger containers such as 5-liter water jugs or 20-liter oil drums. The flexibility of mold design allows users to switch between sizes efficiently, making these machines suitable for diversified product lines.
| Machine Type | Typical Bottle Volume Range | Common Applications |
|---|---|---|
| PET Stretch blow molding machine | 50 ml – 2 L | Water, soft drinks, juices |
| Semi-Automatic Blow Molding Machine | 100 ml – 5 L | Cosmetics, detergents, food oil |
| Fully Automatic Blow Molding Machine | 250 ml – 10 L | Beverages, household products |
| HDPE Extrusion Blow Molding Machine | 500 ml – 20 L | Chemicals, lubricants, industrial liquids |
Each category of machine has its optimal range of bottle sizes, but customization allows operators to go beyond standard volumes when needed.
Several factors influence the size of bottles a blow molding machine can handle:
Mold Cavity Design
The number and dimensions of cavities determine the bottle size and production volume. A single-cavity mold produces larger bottles, while multi-cavity molds are used for small bottles in mass production.
Clamping Force
Larger bottles require higher clamping force to maintain mold stability under air pressure. Machines with stronger clamping units are capable of producing high-volume bottles without deformation.
Stretching and Heating System
PET stretch blow molding machines rely on preform stretching and heating uniformity. The length of the stretch rod and temperature distribution in the infrared oven affect the maximum bottle size achievable.
Air Pressure and Cooling System
The ability to control air pressure precisely ensures proper material distribution across large bottle walls. Efficient cooling prevents shrinkage or distortion during high-volume bottle production.
Material Type
Different resins have different melt strengths and processing temperatures. PET is ideal for lightweight beverage bottles, while HDPE and PP are better suited for larger, more rigid containers.
Blow molding machines are used across multiple sectors, each requiring specific bottle sizes:
Beverage Industry: 250 ml to 2 L bottles for water, juices, and carbonated drinks.
Household and Personal Care: 100 ml to 1 L bottles for shampoos, detergents, and lotions.
Food Industry: 500 ml to 5 L bottles for sauces, oils, and condiments.
Chemical Industry: 1 L to 20 L containers for cleaning agents and industrial chemicals.
Pharmaceutical Sector: Small 50 ml to 500 ml bottles for liquid medicines and disinfectants.
This broad adaptability makes blow molding technology an essential process in packaging manufacturing.
When selecting a blow molding machine, consider the desired bottle size range, production volume, and material type. For example, a fully automatic PET stretch blow molding machine offers high efficiency and precision for beverage bottles, while extrusion blow molding equipment is better suited for thicker HDPE chemical containers. Manufacturers that produce both small and large bottles may benefit from modular systems capable of adjusting mold sizes and air pressure levels easily.
At BOHANG, we specialize in the design and production of advanced blow molding machines capable of handling a wide range of bottle sizes from 50 ml to 20 liters. Our equipment integrates intelligent temperature control, servo-driven stretching, and precision air pressure systems to ensure consistent quality across different bottle volumes. Whether for beverage packaging, household chemicals, or industrial containers, BOHANG provides reliable, customizable solutions that improve efficiency and reduce production costs.
In summary, modern blow molding machines can handle bottle sizes from tiny 50 ml containers to large 20 L drums, depending on the machine’s type and configuration. With manufacturers like BOHANG offering flexible, high-performance equipment, businesses can produce bottles tailored to their exact market needs.
