EPISTOLIO s.r.l. of Varese at K 2019 in Düsseldorf -- K Trade Fair
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Via Piemonte 120, 21100 Varese
Telephone +39 0332 212692
Fax +39 0332 223666

Hall map

K 2019 hall map (Hall 11): stand F10

Fairground map

K 2019 fairground map: Hall 11

Our range of products

Product categories

  • 03  Machinery and equipment for the plastics and rubber industries
  • 03.01  Machines and equipment for preprocessing and recycling
  • 03.01.001  Mixers
  •  Mixers, continuous type, for solids

Mixers, continuous type, for solids

  • 03  Machinery and equipment for the plastics and rubber industries
  • 03.01  Machines and equipment for preprocessing and recycling
  • 03.01.001  Mixers
  •  Mixers, continuous type, for liquids

Mixers, continuous type, for liquids

  • 03  Machinery and equipment for the plastics and rubber industries
  • 03.01  Machines and equipment for preprocessing and recycling
  • 03.01.001  Mixers
  •  Mixers, batch type, for solids

Mixers, batch type, for solids

  • 03  Machinery and equipment for the plastics and rubber industries
  • 03.07  Process automation
  • 03.07.007  Material handling
  •  Dosing and metering equipment
  •  Gravimetric dosing and metering equipment

Our products

Product category: Gravimetric dosing and metering equipment


This technology is based on the continuous and separate dosing of each component.

The flow is regulated by a digital control system through a load cell, which measures the instant loss of weight of each component and consequently adjusts the speed of the falling of the material. Our PID control, developed during more than 30 years of experience in the field, and developed with the support of our customers, ensures an high accuracy of dosage and high levels of reaction.

This dosing system is particularly suitable to be used for the starve feeding of twin-screw extruders for compounding, rigid PET film extrusion and other applications. The components are mixed directly and “in line”, without the need for any mixing device, and are immediately taken away from the extruder, preventing any accumulation in the hopper.

The continuous loss-in-weight starve feeding has many considerable advantages, such as:
  • avoid the accumulation of material in the hopper of the extruder;
  • a better control of the process and certainty of repeatability and accuracy of the set recipe;
  • increase the flexibility of the line, untying the relationship between the flow rate and the speed of the extruder’s screw;
  • constant feeding of the extruder;
  • possibility of rapid and “in line” materials change.
For this type of application EPISTOLIO offers single or groups of vibrating channel dosers, from 2 to 6 components with digital control. Our dosing groups include feeders, refill hoppers and an integrated or remote control panel, and can work with a range up to 2,500 kg/h and an accuracy of +/- 0.25% to 0.5%.

Our dosers and dosing groups can also be provided in insulated version for the feeding of high temperature materials or with closed  channels for the containment of the powders.

The control panel, fully equipped with Siemens PLC and electronics, can be installed on the structure  of the dosing unit or located remotely, and linked through connectors for a quick and easy installation. Moreover, it can be provided with Ethernet modem for tele-assistance.

All our loss in weight feeders and dosing units are designed and manufactured according to specific customer needs, ensuring high levels of flexibility and customization.

The dosing vibrating channel of the series VLADY can be used both for the feeding and weighing of granules, flakes and other grounded materials.

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Target Products

Product category: Gravimetric dosing and metering equipment


Continuous dosing is another solution, alternative to batching, for the feeding of a single screw extruder. This application,  is widely used when greater accuracy and greater control of the dosing are required.

For this application, Epistolio is able to provide different dosing groups, where each group is engineered  and constructed according to the needs of the customer.

A standard application may be constituted by a weighing hopper, drowned in a  collection hopper, which includes one or more continuous gravimetric loss-in-weight dosing units, with screws or vibrating channels. The main component is fed by gravity through the weighing hopper, while the various additives or secondary components are individually fed gravimetrically and by continuous dosing. Our controller allows to adjust the dosing of the additives according to the consumption of the main component, in order to always obtain the same recipe and to align the dosing flow with the flow of the extruder.

Another application may instead foresee the continuous and separate dosing of different components within a collection hopper, which, depending on the level of the material inside, it regulates the flow rate of the dispensers, always ensuring an adequate material amount to the extruder screw. Also in this case, the dispensers may be made by vibrating channels or screws (single or double) depending on the material to be dosed.

Do not hesitate to contact us for more technical/commercial  information.

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Product category: Gravimetric dosing and metering equipment


Even our screw dosing units, such as those with vibrating channel, are based on the concept of continuous gravimetric loss in weight feeding.  But they are used for the dosing of powders, fibers, and materials such as chalk, titanium dioxide or calcium carbonate, microspheres, vegetable fibers or wood flour.

The control panel is fully digital, with Siemens PLC and components.

The dosing screws of our dispensers are interchangeable, in step and size, in order to easily increase the flow range of a single machine, adapting it to the necessity of feeding different materials in a very short time. Also in this case, each dosing group may be composed by dispensers (with automatic bridge-breaker systems), refill hoppers, level sensors and control panel. We can provide flow rates up to 700/800 kg/h, with an accuracy of +/- 0.25% to 0.5%.

The feeders can be integrated into a multi-product dosing group,which can include both screws and vibrating channels, with a single control panel.

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About us

Company details

Epistolio Srl is a well-established company which , for over 30 years , through a careful policy of focusing on global service to the customer, on the accuracy and timeliness of deliveries and on competitive prices, has been able to  carve out a role as a leader in the supply of electrical and mechanical equipments for the general industry, and in particular for the industry of plastics and rubbers.

Through the pursuit of a business strategy based on expanding the product package provided by Epistolio, our society has developed over the years, alongside its main business, a productive activity.

Epistolio, thanks to highly skilled technicians , has acquired a complete knowledge in the production of dosing systems for extrusion machines.

Epistolio “Dosing-Weighing Division”, through a strong expertise and preparation of its technical/commercial department and an intensive collaboration with its partners, is able to provide consulting, engineering and production services for the development of dosing systems, for solid and liquid materials, operating continuously or in batch mode and tailored  to specific Customer needs. Most of our feeders are installed in the compounding industry and for the extrusion of PET sheets.

Today Epistolio proposes itself with authority as an ideal partner for those companies, which are looking for a flexible and reliable interlocutor to be in charge of all matters relating to the dosing process of plastic materials.

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