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Rotational Molders

A reliable source for Rotationally Molded Plastic information and leading Rotationally Molded Plastic Companies & Suppliers.

When creating various plastic items in high demand, using a rotational molder has many benefits. A moving mold can be highly beneficial when creating plastic objects and opens up a wide range of plastic fabrication options. By regulating cycle times and improving the effectiveness of the thermoplastic casting process, rotational molders also lower manufacturing costs. Products made with rotationally molded plastic can be tailored to various thicknesses, material compositions, configurations, and product requirements. Read More…

Rotational Molders Rotational molders are machines that are used to form hollow plastic products using molds and rotational movement. The demand for plastic products is very high throughout all sectors of the global economy.
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Leading Manufacturers

Orange, CA  |  877-768-6585

As a full-service rotational molding company, Roto Dynamics is your source for high quality, custom rotomolded products. Since our inception, we have continued to earn success by closely working with our customers, developing innovative and tailored solutions. We are with you every step of the way, from design and development to production and assembly. For a complete view of our capabilities and services, check out our website, or submit a request for quote to see how we can serve you!

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Roto Dynamics Inc. $$$

Pearland, TX  |  281-648-0909

We are a custom manufacturer of rotationally molded products. Our state of the art technology creates precise, cost effective and dependable products. Whether your order is large or small, we want to be sure you are satisfied.

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Sherman Roto Tank $$$

Winfield, KS  |  620-221-9464

Western Industries Plastic Products, LLC, specializes in large-part plastic blow molding. We provide expertise and services in product design, process improvement, and product assemblies. We offer our customers comprehensive services and turnkey opportunities to achieve their specific project goals. We can assist with: R&D, product design, product improvement, and secondary-fixture design. For all your product needs, be sure to contact us for a quote today!

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Western Industries Plastic Products LLC $$$

Elberfeld, IN  |  800-304-4600

We provide outstanding custom plastic rotational molding. Our teams offer short lead times and we will assist you from concept to production. All of our materials and designs are FDA approved and we can handle the most complex projects. We are your one stop shop for all of your rotational molding needs. Give us a call today to learn more information!

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Fibertech Plastics $$$

Manitowoc, WI  |  920-645-0461

Trust Redline Plastics for all your plastics production needs. Rotational molding of parts up to 181 inches, vacuum/thermoforming of parts up to 120 in, and industrial cut-and-sew all under one roof! Our experienced team can handle your product development, engineering, and prototyping; provide quality on-time production of runs large or small; and value-add through assembly, packaging, and shipping.

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Redline Plastics $$$

Houston, TX  |  346-406-8158

Texas Rotomold is a superior manufacturer of rotationally molded plastics. With many years of experience, we can efficiently serve our customers at competitive prices. Our main focus has always been to provide our customers with high-quality products with the exact specifications for their needs.

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Texas Rotomold $$$

Brainerd, MN  |  218-824-2025

Revolv manufacturing specializes in the design and manufacturing of rotationally molded plastic. Since 1995, we have been producing high-quality rotationally molded plastic products. We offer our customers unrivaled customer service and high-quality products.

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Revolv Manufacturing $$$

Claremore, OK  |  346-406-8158

Need a custom rotationally molded plastic product? RotoMold USA produces items via rotational molding and performs product design, assists with mold manufacturing and mold maintenance, does quality testing and other services. We’ve done rotomolding for gas and oil, water recreation plus airline industries.

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RotoMold USA $$$
placeholder image Roto Dynamics Inc. Sherman Roto Tank Western Industries Plastic Products LLC Fibertech Plastics Redline Plastics Texas Rotomold Revolv Manufacturing RotoMold USA

Rotational thermoplastic molding is also used to address a wide range of temperature, melt flow, and shrink rate problems. This sector is always undergoing innovation and improving efficiency due to research and development. Rotational molds cost less upfront because roto casting fills a mold using centrifugal force and gravity. This method is particularly true compared to other molding techniques like injection molding and blow molding.

rotational molding

For rotational molding to consistently create high-quality parts, several interrelated factors and details must be configured properly: the specific part design, the plastic selection, the design and construction of the mold, and finally, the rotational molding procedure itself. The end-use criteria typically include guidelines describing the part's design, construction material, and measurements.

However, every design must also be useful and affordable. The part's design determines the cost of mold creation and the operation process. Due to their high melting temperature and viscosity, fluoropolymers, another type of product used in rotational molding, place extra constraints on the design of the process and the component.

rotational molding machine

Rotational Molding Process

Large hollow, seamless, and double-walled items are produced using the rotational molding plastic casting technique. The rotational molding process has three stages involving a heating chamber, a mold on a rotating frame, and a cooling chamber. Specially created rotational molds can produce both single and double-walled goods.

In this process, one of the polyethylene resins serves as the primary raw material for rotational molding and is placed into the mold at the start of the procedure. The mold is heated while being rotated in the heating chamber. The mold's frame can rotate the mold around its axis of rotation. The resin is distributed over the inside surface of the mold as it spins, giving the completed item a uniform thickness across its surface.

A predetermined amount of time is required for the mold to transition, i.e., from the heating chamber to the cooling chamber. The liquefied melted resin is allowed to cool before the plastic product is expelled from the mold. Rotationally molded goods are of the finest caliber and are renowned for their toughness and longevity.

Rotational Molders Available

Cast Molds: One of the rotational molds that are most frequently utilized. Both big and small parts can be made with cast molds. Cast molds frequently create components with intricate designs and a lot of detail. To include design modifications, they are easily adaptable. The textures and shapes of existing objects can be "pulled" with the help of these molds. This casting method works excellently for parks with intricate curving or distinctive characteristics.

Acrylic Molds: These molds work by adding epoxy and then curing with a liquid polyester that uses thermosetting. These epoxy molds, like cast molds, are excellent for small batches or prototype designs that may require modifications before their final forms are produced.

CNC Molding: When high precision is necessary, CNC molders are used. However, they often cost a lot of money and are only applied in unique situations.

Rotational molding products are mostly large plastic products such as:

  • Oversized containers
  • Vehicle part components
  • Animal habitats
  • Traffic cones
  • Recycling bins
  • Play area slides
cnc rotational molder

Applications of Rotational Molders

  • Rotational molding is the only way to make material handling tools like strong crates, stackable pallets, containers, and insulated boxes.
  • They can also make plastic storage tanks, gallon barrels, and carboys for holding small to extremely large amounts of water and chemicals.
  • Some examples of laboratory and medical supplies made with rotational molding include syringes, oxygen masks, and squeeze bulbs.
  • They also make sanitary products such as garbage cans, trash bins, and septic tanks.
  • Among other maritime vehicles and equipment for transit and water activities, rock and roll molding machines create rowing boats, canoes, kayaks, and buoys.

Rotational Molders Informational Video


Rotational Molding Power Pages

Rotational Molding

Blow Molding

Rotational molding, commonly referred to as "rotomolding", is a plastic casting technique used to produce large hollow, seamless, and double-walled parts. It is a three-stage process that involves a mold on a rotating frame, a heating chamber, and a cooling chamber. Molds for the rotomolding process are specially designed....

Blow Molding

Blow Molding

Blow molding is a type of plastic forming process for creating hollow plastic products made from thermoplastic materials. The process involves heating and inflating a plastic tube known as a parison or preform. The parison is placed between two dies that contain the desired shape of the product...

Compression Molding

Compression Molding

Molding is a manufacturing process that uses a mold - the latter being a solid container used to give shape to a piece of material. It is a forming process. The form is transferred from the mold to the material by...

Plastic Molding Processes
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