Rotomachinery Group

Two operating sites, more than 50 years of experience and more than 1,600 rotational molding plants installed in 100 different countries. 

Leader in rotational molding

Rotomachinery Group has been operating for over 50 years in the design and installation of machines and accessories for rotational molding. The group includes: Polivinil Rotomachinery S.p.a., based in Europe, and STP Rotomachinery INC, operating in North America. 

Who we are

We design, build, and install the most advanced and efficient machines for rotational molding on the global market.

What is rotational molding?

Rotational molding is a processing method for thermoplastic materials that allows the creation of hollow bodies of any size and shape.

Polivinil Rotomachinery has over 50 years of experience in creating machines for the rotational molding industry.

Application areas of rotational molding

The items that can be obtained with rotational molding technology are continuously increasing due to innovations introduced in equipment and ongoing research on materials.

Construction and Road

The right machine for every need

Rotomachinery accompanies customers from design to testing of every model of rotational molding machine.

Design and implementation

Starting from the molder's needs, we can suggest the best among the various custom rotational molding solutions.



Machine testing

The test takes place in the presence of the customer and we use to make trials rotational molding cycles and checks of the machine's functional characteristics are carried out.

Training for use

Our technicians take care of the training and education of operators who will be able to use the rotational molding equipment right away.



After-sales service

After delivering the machines, we remain alongside customers through our after-sales service and consultancy.

Our machines for rotational molding

Rotomachinery Group offers a wide range of rotational molding machines, both new and used, to meet the diverse needs of molders.

Rotomachinery Group Independent Arm Machines

Machines with Independent Arms

State-of-the-art rotational molding: a single machine for the simultaneous production of items with different cycle durations or multilayer.
Rotomachinery Group Fixed Arms Machines 3

Fixed Arms machines

The ideal, reliable, robust and simple machine for the production of items with rapid processing cycles and similar durations.
Rotomachinery Group Shuttle Machines 18

Shuttle Machines SRM

High-capacity machines for large items, up to four multipurpose stations for cooling loading/unloading.
Rotomachinery Group Machines Rock n Roll 12

Rock & Roll HRM Machines

Machine for rotational molding of very large items, with a tilting oven and automatic carts movement.
Rotomachinery Group Machines Line PRM 900 Box 3

PRM 900 Box Line

Complete line for molding of large series of small articles in PVC/PLASTISOL, elastomers, ecc.
Rotomachinery Group Laboratory Machines

LRM Laboratory Series

Machine for material testing and setting up the rotational process with all the instrumentation for analysis and cycle tuning.

Accessories for rotational machines and systems

Each machine can be equipped with accessories to make the molding process more efficient and attentive to consumption, but also to improve the quality and safety of workers.

Discover the Complete Line

Rotomachinery Group has designed this system consisting of a series of machines and accessories that work in succession to determine the correct dose of one or more types of materials in the mold. A system that allows you to work avoiding errors and waste of material.


The chosen raw material is introduced into the pulverizer, where it is transformed from granule to powder.


The powders are transported from the storage area to the processing through customizable systems.


The coloring of the obtained powders is done through a high-speed mixer. 


The system automatically doses the exact amount of material needed for the molds.


This complete line is compatible with all rotational molding machines. 

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