To put it simply, blow molding is a manufacturing process for creating objects from plastic. This process can be complex, but it is possible to break it down into easy-to-understand steps. Let’s look at the basic steps involved in blow molding, the materials, and the types of processes. Then delve further into the qualities to consider when searching for a reliable blow molding machine supplier.
The Blow Molding Basics
Blow molding is a manufacturing process that involves inflating a hot plastic tube until it forms into the desired shape.
The blow molding process begins with a hollow tube of plastic called a parison.
The parison enters the blow molding machine, heating it until soft and pliable.
Air blows into the parison as it softens until it takes on the shape of the blow mold.
The blow molding machine then cools the parison, setting the plastic into its new form.
Primary Materials Used for Blow Molding
There are three primary materials for blow molding: polyethylene terephthalate, high-density polyethylene, and engineering polymers.
1. Polyethylene Terephthalate (PET)
PET is a robust and lightweight plastic often used in blow molding applications. PET is resistant to both impact and heat, making it an ideal material for blow molding. It is the packaging of choice for single-serve beverage bottles and pharmaceuticals.
2. High-Density Polyethylene (HDPE)
HDPE is a durable plastic with high resistance to impact. Its use is widespread in the dairy, oil, household containers, and personal care industries.
3. Engineering Polymers (EPs)
EPs include acrylonitrile butadiene styrene (ABS), polycarbonate (PC), and nylon. The automotive sector uses EPs for many applications.
Three Types of Blow Molding Processes
Modern blow molding processes revolve around three main types: extrusion blow molding, injection stretch molding, and injection blow molding.
1. Extrusion Blow Molding (EBM)
EBM is one of the most common blow molding processes. Blow molding manufacturers often produce three types of EBM machines:
- Shuttle EBM machines
- Long-stroke EBM machines
- Wheel EBM machines
Industries use these machines to produce bottles in various shapes and sizes. Some examples of bottles made by these machines are oil bottles, HIC bottles, and personal care bottles.
2. Injection Stretch Blow Molding (ISBM)
ISBM is the most common process to mold PET containers for beverages. This process involves two steps:
- Injection molding, where the preforms inject into molds
- Blowing, where the molds transfer to another machine that stretches the material to take the shape of the bottle.
3. Injection Blow Molding (IBM)
IBM is a method of producing a preform by injecting material into a mold. The preform transfers to the blowing station, where it forms the object. The bottle then proceeds to the next station for ejection. Medical bottles with highly tight neck finishes are an example of a final product using this technique.
Choose the Right Blow Molding Machine Supplier for Your Business
When looking for a blow molding machine supplier, there are a few things you should keep in mind:
- Good reputation
- High-quality machines
- Excellent customer service
Pet All Manufacturing Inc., is a leading blow molding machine supplier based in Canada. If you’re looking for a reliable blow molding machine manufacturer, contact Pet All Manufacturing Inc., and we’ll be happy to assist.