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The Basics of a Blow Molding Machine

blow molding machine

When it comes to purchasing a blow molding machine, it’s important to know the basics. Learn about the types of materials used and how they are processed. Learn about Polyethylene, Continuous extrusion, Accumulator head, and the rotary wheel. Once you’ve gotten the basics down, you’re ready to begin formal operations.


A Polyethylene blow molding machine (EBM) is a machine that extrudes polymers. It starts by pelletizing raw materials, which are then fed into a screw and barrel arrangement. Pressure is then applied to molten material as it passes through a die, which is arranged in a vertical position. The result is a tube-shaped or oval product.

Blow molding can be done using a variety of materials. The material used in the process depends on the desired product shape and density. HDPE is commonly used for pharmaceutical pills, daily supplements, and nutrition supplements, while LDPE is most frequently used for liquid products. PP and PVC are often used for oxygen masks and drip bottles.

Another type of blow molding machine is the continuous extrusion machine. This machine homogenizes the polymer continuously. Once the parison is finished, the mold halves are closed and the parison is cut to length. There are different types of mold halves, including double and single-bar types. Single-bar molds are more affordable, while multiple-bar molds are more expensive.

Blow molding is a batch process that forms hollow objects from plastic. The technique is similar to the old art of glass blowing. The plastic is heated and a parison is formed inside the mold. When cooled, the parison takes the shape of the mold. The resulting products are incredibly tough, lightweight, and have an excellent volume-to-weight ratio. Blow-molded plastic can also produce complex items with handles and sculpted surfaces.

Continuous extrusion

Continuous extrusion blow molding machines have the ability to produce multiple products in one process. Designed for PE and PVC applications, these machines feature an HMI touch screen and Siemens/B&R controls. In addition to controlling the blow operation, these machines also have safety devices that keep operators and materials safe.

Known manufacturers of continuous extrusion blow molding machines include Wilmington, Bekum, Battenfeld Fischer, and Hayssen. Continuous extrusion blow molding machines are used to create plastic packaging and containers. These machines are able to produce different sizes and shapes, depending on the specifications of the products.

The process begins by extruding a parison vertically. It is then clamped by a mold and pinched off at the bottom and top. Afterwards, a blow pin is inserted into the part, pressurizing it from within. The parison then emerges from the mold, forming a finished product.

Uniloy Inc. is a leading blow molding machine and mold technology company. The company recently launched the third-generation all-electric UCS.E continuous extrusion shuttle machine. The machine can produce a wide range of products from small bottles to large industrial packaging. This machine is also capable of processing bioplastics and post-consumer resins.

Accumulator head

The Accumulator head for blow molding machine is designed for molding large volume containers. These containers include Jerry Cans, water tanks, outdoor parts, pallets, and automotive parts. The Accumulator Head uses hydraulic cylinders to close the mold parts along predetermined paths.

An Accumulator Head can be configured to separate incoming extruded material into multiple streams. These streams can be combined to provide an annular flow, resulting in a circumferentially uniform extruded parison. The Accumulator Head can also include a central cylindrical mandrel, which controls the flow of material in the accumulator outlet.

A Blow Molding Machine with an Accumulator Head is an ideal solution for manufacturing a variety of different industrial parts. They are widely used in the transportation and storage of hazardous liquids, as well as for packaging in the food and non-food industries. Common applications for these machines include water bottles and jerry cans, as well as open top drums, L-Ring drums, and 1000lt IBCs.

An accumulator head for blow molding machine is made from a tubular outer barrel with a cylinder inner surface. It features an outer material-receiving slot and radially-directed flow apertures. An accumulator head is particularly well-suited for blow molding large plastic articles. The front faces of a accumulator head for blow molding machine are spaced 48 inches apart. This gives the operator plenty of room to move their extraction tooling between the mold parts.

Rotary wheel

A rotary wheel blow molding machine is an extremely versatile extrusion molding machine that is used for high-volume production of plastic extrusion blow molded articles. These articles can range from single-serve bottles to large 30-liter containers. The wheel machine is designed to accommodate the specific volume requirements of a particular container. Most wheel machines have dedicated molds for a specific bottle size and can produce upwards of one million bottles per day.

This machine is usually powered by an electric motor, which rotates the wheel. Another important component is a main shaft that carries utilities, such as compressed air and water. The rotary wheel performs a number of functions, including filling the holding hopper and discharging the blown product. The machine is also equipped with pneumatic valves, which increase the repeatability.

One of the features of a wheel blow molding machine is the use of a servo drive system for clamps. This feature ensures extreme consistency in opening and closing the mold. It also minimizes the time and effort required to set up the mold. Additionally, this technology eliminates the need for a second set of staff during mold changeovers.

Another feature of a rotary wheel blow molding machine is that it is more flexible than a conventional PWDS system. In fact, the flexible die ring allows blow molders to achieve better thickness distribution, which leads to weight savings and shorter cycle times. Rikutec is already incorporating this technology into its own line of machines and offering it to other machine makers.

Intermittent blow molding

There are two main types of blow molding machines: the continuous and the intermittent types. In the former, plasticization and extrusion are done continuously, while in the latter, the processes are carried out at irregular intervals. In the former, the plastics are extruded continuously, but they are cooled and demoulded periodically.

The difference between the two types lies in the material used. The intermittent type uses less material than the regular type, while the continuous version uses more. Both of them can process different types of resins. The most commonly used resins are polyethylene and polypropylene. These materials are easy to process and can be used to produce various types of bottles.

The intermittent method uses a rod to extrude plastic. The rod can be either continuously or intermittently to extrude a desired part. The extruder uses a cylinder with a piston to move back and forth, and the plastic melts inside it. When the plastic is cooled, it condenses into the final part shape. This process is also known as the “parting line” method, which refers to the perimeter of the part.

An intermittent blow molding machine is another type of machine that is suitable for producing plastic goods. This type of machine has the same features as a continuous blow molding machine, except that it uses air to swell the material. The plastic is then cooled and ejected from the mold. The water channels in the mold also assist in cooling.

Polyethylene bottles

A Polyethylene bottles blow molding machine can produce bottles of various shapes and sizes. The process uses low-pressure air, ranging from 25 to 150 psi, to extrude plastics. Depending on the design, multiple plastic materials may be used. Once the plastic has cooled, it is placed into a two-part mold and a blow pin is inserted into the neck part of the bottle. The air pressure causes the plastic to conform to the threads and shape of the neck portion of the mold.

Some machines feature multiple processes, such as multi-stage injection blow molding machines. These machines are effectively production lines, able to handle up to four processes at once. This allows the machines to run continuously without human intervention and dispense finished bottles directly into the next step. This reduces floor space, and can make an operation more compact.

When choosing a polyethylene bottles blow molding machine, consider your needs. Most bottles manufactured today are intended for beverages. Two-stage machines are the most popular, but a single-stage machine may be more cost-effective. Single-stage tools are less expensive, but can be difficult to justify for volume under 2 million bottles per year. For example, if you are only producing a few hundred thousand bottles per year, it is not cost-effective to buy a four-cavity tool. Instead, you might want to consider purchasing preforms. Preform suppliers are world-wide, and shipping is very affordable.

Safety is also an important consideration. The machine must be installed with safety measures to prevent accidents. A safety door should close to prevent accidental contact with movement parts. A safety valve should be installed on both the high-pressure air collector and low-pressure air collector. The safety valve automatically opens when the pressure levels are too high or too low. In case of a malfunction, an alarm should sound and the machine should be stopped immediately.


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