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Rotomolding Manufacturers and Companies

IQS Directory provides a detailed list of rotomolding companies and suppliers. Find rotomolding companies that can design, engineer, and manufacture rotomoldings to your specifications. Peruse our website to review and discover top rotomolding companies with roll over ads and complete product descriptions. Connect with the rotomolding companies through our hassle-free and efficient request for quote form. You are provided company profiles, website links, locations, phone numbers, product videos, and product information. Read reviews and stay informed with product new articles. Whether you are looking for manufacturers of plastic seat rotomolding, high speed rotomolding boxes, and polyethylene rotomoldings of every type, IQS is the premier source for you.

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  • Sterling Technologies: A Symbol of Quality & Design

    Rotomolding At Sterling Technologies, we pride ourselves on providing excellent products that stand out in a crowded marketplace, all while maintaining our reputation of outstanding customer service. Our rotomolding experts can provide you with an abundance of services from product design to tooling fabrication. You can count on our resourceful staff to find a solution for virtually any molded plastic need you may have. Read More......

  • Rotational Molder Types and Their Benefits

    Rotomolding There are a number of different kinds of machines used in the rotational molding industry. The most prevalent kind of rotational molders are the clamshell, the vertical, the up and over, the swing arm, and the carousel machine. Each rotational molder, while different from the rest, performs important duties. These different duties will vary according to the machine's ability as well as the needs of the industry employing the machine. For example, the clamshell machine is great for use where you may not have a lot of space. It...

  • Spring Kayaking Made Possible with Rotationally Molded Plastics

    Rotomolding Spring is finally here and I can finally partake in one of my favorite activities when I go up north to my Grandparents' cabin. It's now warm enough to go kayaking on the river near the cabin. This is my favorite time of year to kayak because the downed trees from past storms still litter the river. This makes for an exciting adventure because I have to navigate through all the trees and logs, attempting to squeeze through small openings and duck under logs. I relish the moment when...

  • The History of Rotomolding

    Do you know the history of rotomolding? This process is actually quite fascinating, and so is the history. The first documented use of the rotational molding system was in 1855. R. Peters used biazial rotation and heat to create metal artillery shells and hollow vessels. The rotational pull of the process make the walls of each shape uniformly thick and dense. In 1905, the rotational molding process was used to hollow wax objects, and eventually, chocolate eggs in 1910. By the 1920s, the process was used to mold plaster of...

  • Plastics Innovation and Resource Center

    Roto Dynamics is excited to be participating in this year’s “Hands-on Rotational Molding Workshop” held at the Pennsylvania College of Technology. This two day seminar is presented by Paul Nugent, Jerry Ramsey and PIRC staff. The event is sure to be packed full of useful theoretical and hands-on training exercises. Since 2000, the Penn State rotational molding center has been in existence and offering technical research assistance and hands on resources to the North American rotomolding community. Partnering with the Association of Rotational molders (ARM) and Society of plastic engineers...

Industry Information


Roto molding or rotomolding, also known as rotomoulding, plastic rotational molding or rotational molding, is a plastic formation process used to shape raw plastic material into hollow, usable products. It involves the use of a rotational mold and nearly any thermoplastic. Some of the thermoplastics most commonly molded into plastic products using roto molding include: high density polyethylene (HDPE), low density polyethylene (LDPE), nylon, polyethylene terephthalate (PET), polycarbonate and polyvinyl chloride (PVC). Used to create both small products in large quantities and large products in small quantities, roto molding is known to create plastic formations that are uniform in both quality and precision wall width. The products it can produce are very diverse indeed, including items like plastic construction cones, plastic tanks and even plastic flamingos. Also, rotomolding can be used to create both standard and custom stock shapes.

Typically, roto machines consist of molds, an oven, a cooling chamber and mold spindles. The molds are mounted on the mold spindles, which allow the molds to rotate. Most roto molds are made out of aluminum or stainless steel. To begin the rotational molding process, manufacturers first stack raw plastic material into a half a mold until it is full. Once full, they attach the mold’s other half and then seal it. Once sealed, the plastic inside the mold placed inside the oven and heated until it becomes either malleable or molten, depending on the requirements of the piece. At this point in most other thermoplastic forming or molding processes, like injection molding or extrusion, the manufacturer would apply heat and/or pressure to shape the molten plastic. In roto molding, however, the mold is instead rotated by the mold spindles upon which it is mounted. Depending on the type of the equipment being used, the mold may be rotated either in a single direction only or biaxially. The choice of which equipment to use depends upon what kind of shape or shapes a manufacturer would like to form. Either way, once the plastic has been rotated inside the mold long enough, it will have coated its interior, effectively taken on its shape. Once this has happened, the mold stops rotating and is quickly cooled down either inside the cooling chamber, by an external water jet cooling system or perhaps by another method. After it has been cooled, the plastic is ejected from the mold, having taken on its shape. Once a part has been roto molded it can either be prepared for its shipment to customers or it can be sent on for secondary processing like surface treatment or cutting. This depends entirely on the shape and requirements of the new part’s intended application. However, secondary processes and other forming processes are often used in conjunction with roto molding because the demand for plastic shapes is so large and varied.

Roto molded parts can be made on one of several different types of roto molding machines. These machines include: rock and roll machines, clamshell machines, shuttle machines, vertical or up and over machines, carousel machines and swing arm machines. Each model offers something different. Rock and roll machines, for example, are specially designed with small heating chambers to create long, narrow parts. Clamshell machines are actually a type of rock and roll machine, but they are distinguished by their use of a single primary rotational arm, though they usually also have support arms on their ends. Most other roto molding machines use two or more arms. Shuttle machines, for instance, typically have two arms that work independently, moving the mold back and forth in between the heater and the cooler as it turns biaxially. Some shuttle machines do, however, have only one arm. In this case, the arm moves the mold horizontally from the heater to the cooler as it spins. Vertical rotational machines are smaller than most other rotomolding machines; they are considered small to medium in size. They are valued for their energy efficiency, which is born out of their compact heating and cooling chambers. Next, carousel machines are one of the most common used rotational molding machines. Carousel machines may have up to four arms and six stations, and they come as either fixed or independent equipment. Typically, fixed arm carousel machines consist of three arms that are required to move together, while independent arm carousel machines have between three and four arms, all which move separately from one another. Both types of carousel machines are available in a wide variety of sizes. Finally, swing arm machines can have up to four arms, all of which move bi-axially. The arms, which do not all have to be engaged at the same, are mounted on the respective corners of the machine, where they swing in and out of the oven.

385 Gallon Roto molding Containment Basin
Roto Molding 550 Gallon Tank
Roto Molding
385 Gallon Roto molding Containment Basin – Sherman Roto Tank
Roto Molding 550 Gallon Tank – Sherman Roto Tank
Roto Molding – Fibertech, Inc.
Roto Molding
Roto Molding – Fibertech, Inc.
Rotomolding – Roto Dynamics Inc.
Rotomolding – Roto Dynamics Inc.

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