How a Blow Molding Machine Produces Bottles and Containers

How a Blow Molding Machine Produces Bottles and Containers

Blow molding machines produce the plastic bottles we all use for drinks, water, cleaning products, food, and more. It is a process that uses air pressure to blow a plastic tube (called a parison) into a mold and then cooling it before it is ejected from the mold.

The most popular raw material used in blow molding is polyethylene. This type of plastic has many desirable qualities such as good processability, toughness, odor and toxin free, and excellent clarity.


The extrusion process uses a blow molding machine to produce bottles and containers of all shapes and sizes. Millions of people use these bottles every day for soda, water, cleaning products and more. This process involves heating plastic resin in an extruder barrel and screw assembly and forcing it through a die to create a tube called a parison.

The molten plastic resin is pushed through the die by the accumulator head, which has a set capacity and a pair of cylinders that control the shape of the parison. The mandrel half of the die determines the interior diameter and the core pin half dictates the exterior diameter.

Once the preform is molded, it is sealed or clamped by a split die. This step is followed by inflation. Compressed air is forced inside the preform, which inflates it to match the design of the die.

The inflated product is then cooled and ejected from the mold. This stage is often accompanied by blow molding machine quality inspection using onboard laser measurement systems. After the product passes inspection, it is spooled or cut to final size and sent down the line. The remnants of the barrel, worksite and the blow molding machine should be cleaned, wiped down and lubricated each shift. This helps mitigate defects and maintain equipment efficiency. It also reduces costs by reducing downtime for maintenance.


Injection blow molding uses a hot runner manifold and screw assembly to melt the plastic resin. This is then injected through nozzles into a cavity mold and core pin. The core pin holds the outer shape of the container while the cavity mold forms the internal shape. The preform is then blown by pressurized air. This produces the bottle.

In addition to bottles, this process also produces a wide variety of other hollow-bodied containers. These include jars and drums for food and other liquids. It is also used to make toys and other plastic sports equipment.

This process is very fast and efficient and can produce high volumes of quality containers. It is also very cost-effective. The injection process allows the production of more intricate shapes and designs than can be produced with extrusion blow molding. It is ideal for producing containers with close tolerance threaded necks, styled shapes and wide openings at the mouth.

The injection-stretch blow molding (IBM) process is a variation of this type of blow molding that improves the optical and barrier properties of a bottle by using biaxial orientation of the polymer chains. This is a process that can be used with many different types of plastic, but it is most commonly used with PET (polyethylene terephthalate). This type of blow molding is also more accurate than extrusion blow molding and produces less waste.


The blow molding process is used to produce hollow plastic products, such as bottles and containers. This technology allows industrial manufacturers to produce large quantities of these products quickly and cheaply. It is also highly versatile, as it can be used to produce a wide variety of shapes and sizes.

Blow molding machines use air pressure to inflate a plastic tube known as a parison, which is then sealed into a mold to form the final product. The inflated plastic is then cooled to solidify. This process can be used to create a variety of products, including bottles, containers, and drums. It can be used with a variety of thermoplastic materials, such as Acrylonitrile Butadiene Styrene (ABS), Polyethylene Terephthalate (PET), and Low-Density Polyethylene (LDPE).

When using a blow molding machine, it is important to follow proper procedure to ensure that the finished product is free from defects. In addition to ensuring that the plastic is heated to the proper temperature, it is important to make sure that the parison is long enough to fill the mold. Short parisons can result in defective products with shortened lengths or missing sections. It is also important to ensure that the molds and cooling systems are clean to avoid the formation of air holes in the finished product. In addition, the molds should be cooled evenly to prevent different degrees of shrinkage in different parts of the product.

Final Product

A blow molding machine creates plastic bottles and containers. It works by melting down plastic and using air pressure to blow the molten plastic into a mold. This versatile manufacturing process is used in a variety of industries to produce many of the plastic products we use every day. It is also an excellent choice for producing hollow plastic parts because it allows for a thinner wall than injection blow molding. However, to ensure the quality of your product, it is important to use a high-quality plastic with good melt strength and viscosity.

The blow mold design process can be very complex. It starts with raw plastic pellets that are fed into a hopper or screw depending on the type of machine. The plastic is then superheated, and a parison (a tube of melted plastic) is formed around the blow molding machine factory mandrel. The parison is then clamped into the mold and inflated with compressed air. The inflated plastic takes the shape of the mold cavity.

Blow molding is a popular method for making plastic bottles and other containers. It is a very cost-effective way to manufacture plastic, and it can be used in a wide range of shapes and sizes. Its roots can be traced back to glassblowing, where craftsmen would heat a piece of glass and inflate it with air. However, it was not until the 1930s that inventors developed commercial machines to make blow-molded bottles that made the process practical for mass production.

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