Continuous extrusion blow molding machines are most often used to produce hollow plastic products of smaller size and volume. This equipment is ideal for high production runs with a large output of products, such as:
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The most recognized manufacturers of continuous extrusion blow molding machines—many of which are available in Arlington Machinery’s inventory—include Wilmington, Battenfeld Fischer, Bekum, and Hayssen.
In the continuous blow molding process, the screw is continually turning and pushing out plastic parisons. As the plastic parison moves in a constant stream, the molds move to meet it (unlike some machines where the molds are stationary). The molds clamp over the section and then move away, allowing for the next mold to do the same in quick succession.
In this way, the steps of plasticizing, extruding, and forming are continuously carried out without stopping. This continuous blow molding process is best suited for processes that are:
There are two main types of continuous blow molding machines, categorized according to the placement and type of molds:
Both types of continuous blow molders have co-extrusion capabilities and can be configured with varied numbers of extruder heads, molds, and clamping devices. Both types of blow molders can also be used with a variety of resin types such as PVC and PE.
Arlington Machinery brings more than 35 years of experience in the purchase, sale, and refurbishment of extrusion blow molding equipment.
In addition to continuous blow molders (both rotary wheel and shuttle), we offer a wide inventory of intermittent blow molders, including the accumulated head type. Our product specialists would be happy to help you choose the best type of blow molder for you.
We operate our own warehouse and machine shop, and our blow molding inventory is constantly updated with machines from Bekum and other top manufacturers. Contact us to speak with a plastics extrusion expert, or fill out our online form to request a product quote.
If you’re producing lightweight hollow containers, reciprocating screw blow molding machines are one of the most efficient and cost-effective types of machinery available. These machines are a type of intermittent extruder and are well suited for small, lightweight applications.
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Arlington Machinery offers new, refurbished, and as-is reciprocating screw extruders from a variety of top manufacturers:
Similar to an injection molder, reciprocating screw extruders move backward and forward, melting the plastic and then pushing it through the flowhead and die into the mold. For most reciprocating screw machines, the molds remain stationary under the die head, opening and closing to release the plastic parison for blowing.
Due to the nature of this process, reciprocating screw machines are known to provide:
However, it is important to note that reciprocating screw machines have a more limited range of materials used. This type of intermittent extrusion equipment is ideally suited for HDPE (high density polyethylene) with limited use for PP (polypropylene).
Reciprocating screw machines are most often used for thin-walled hollow containers. Most reciprocating screw machines can manufacture monolayer products only, although some select machines do have multi-layer capabilities.
The most common reciprocating screw applications include:
Are you producing larger, higher-volume, or thicker-walled containers? Then you might want to consider a specialized type of reciprocating screw machine: the accumulator head blow molder. Accumulator head machines allow for much larger shots (up to 75 lbs) and are ideally suited for tougher container applications such as jerry cans, chemical drums, or water storage.
If you have questions about the best type of extruder or would like more information on how these machines work, please reach out to Arlington Machinery. We have been a worldwide leader in plastics manufacturing equipment since and would be happy to help you!
We maintain our own expansive warehouse and have a full-service machine shop in
house, allowing us to offer a variety of extrusion-related inventory on a daily
basis. We sell new, used, and as-is extruders and also offer purchasing,
valuation/appraisal, and refurbishing services.
Call Arlington Machinery today to speak with a product specialist. If you’re ready to request a product quote, simply fill out our online form.