Discover our quality points: Virto-Cuccolini C-Line sieves’ sealings philosophy

One of our most well-known quality points as far as our sieves design is concerned is the way we provide that your Virto-Cuccolini C-Line sieving equipment is perfectly sealed, with the aim to avoid product leakage and dispersion inside the sieve.

Why is sealing so important in sieves’ design?

There are many reasons for preventing the product from leaking through the seals of the mesh support ring and/or through the deck borders:

food product may create mustiness in case it gets stuck in some dead-end areas in the sieve

high-value product could be dispersed if the sealing system is not working properly

– in solid-liquid separation, a leaking design could cause loss of liquid product, apart from damages caused to the sieve itself or to the surrounding area



During our 30-year long experience in the ceramic industry – where we had the occasion to learn how to sieve powders, granules, pastes and liquids under particularly challenging production objectives – we conceived our sealings and our general sieve design by taking care that the product is never leaking (of course, if maintenance is done correctly!) or dispersed inside the sieve.


Maintenance of Virto-Cuccolini C-Line sealings is easy:

– gaskets (available in silicon, EPDM and Viton) can be easily replaced

– they are basically of 2 types: one embracing the mesh supporting ring (and holding the mesh cleaning system, when included); and one sitting underneath the deck to protect the mesh in the contact areas

Sealing is finalized by the active presence of the installed decks and of the external fixing ring so that sealing adherence is made perfect, that dead areas with product residues are avoided, and that – in the first place – the product in the sieving area is never really getting in touch with the sealing area!

Replacement of gaskets is suggested at least once a year, especially if the replacement of mesh rings is frequent due to the change of cut point necessary to your sieving process.

Would you like to discover more about our sealing system and other technical aspects of Virto-Cuccolini sieves’ range? Contact us by using the below form and we will be happy to give you more information!

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    Are you planning to include a Virto-Cuccolini sieve within your plant?

    Let’s go through some important tips concerning installation and use within a plant so that you can get out the best from Virto-Cuccolini sieving equipment and avoid later issues.

    A vibrating or tumbling sieve is a piece of equipment which – differently from any other comparable processing equipment – needs to move.

    Of course, a sieve must be firmly installed on the ground or on a suitable structure, studied to exclude resonance phenomenon both when the sieve is running dry or with the product. In case such a phenomenon appears, please consider reinforcing the structure accordingly.

    Apart from the bottom part of the sieve, which hosts fixation holes (in its basement or frame), the rest of the sieve structure is moving during the sieving process by vibration or tumbling.

    Therefore, the sieve needs to be installed in a suitable area in which no other rigid structure is present around the sieve in a position that may interfere with the sieve’ movements.

    Analogously, all inlets and outlets must have a flexible connection, in a minimum measure covering 1.5 times the diameter of the inlet or outlet (i.e. diameter 200 mm requires a flexible connection D200 with a minimum height of 300 mm). This means that feeding and discharging equipment shall remain at a reasonable distance from the sieve. Moreover, flanges are not suitable for connection; nothing shall hang from the outlets but the flexible connection alone.

    The sieve is supported by springs; in case the springs are bending or inclined, this means that something is interfering with the sieve stability (maybe some other piping) and a check around the sieve is required.

    Moreover, around the sieve, there must be enough room to allow periodical checks and maintenance. Consider for instance that the mesh supporting ring, whose dimensions are equal to the diameter of the sieve, may need to be disassembled from the machine to allow mesh replacement. With medium and big diameters and depending on the height at which the sieve is installed if not directly at the ground floor, lifting equipment may be needed to carry out this replacement.

    Another important concept to remember is that a sieve can never be used as a buffer. Meshes and their supporting ring are not engineered to support weight, but just a time-limited passage of product through the mesh. Product weighing on the mesh may cause the mesh to relax or even mesh breakage, apart from being a major disruption within the range of allowed vibrations, potentially damaging so the structure of the sieve.

    Should you have any questions concerning sieves installation, do not hesitate to contact Virto-Cuccolini and receive guidance!

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      Our Virto-Cuccolini team is used to innovate while daily responding to our Customers’ requests.

      It’s exactly there, where the magic begins: one Customer’s request can indicate a need for what turns out to be a wider group of applications and our team has always in mind the opportunity to push our technology a little further.

      That’s how our Zero Gap Discharge System for C-Line vibrating sieves is born.

      The oversize product might – under some specific conditions – find it a bit harder to overcome some small gap and flow freely to discharge. Or maybe, this effort can create a transformation in the oversize product itself, and change some product features, on which quality and/or the rest of the production cycle is relying for some reason. A particularly valuable product should be even damaged in value and performance by discharge issues.

      Eliminating any gap in front of sieve discharge is therefore giving the chance to improve the sieving process under some collateral aspects like particles shape and integrity of their aspect and features.

      This week we have completed the construction of the first VPM 1200 from our C-Line range with the new Zero Gap Discharge System.

      Watch the below video to see how it works:

      Is product residual after sieving a headache for you? Contact us to learn more about our Zero Gap Discharge System and check whether this can be a solution for you!

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        The Virto-Cuccolini team has worked hard in recent months to achieve their goals when the market starts again after the pandemic!

        We deserved a little break, from May 29 to June 02 at the Italian Republic Day (June 02).

        We will be operational again on June 03, 2021.

        If in the meantime you need our support, you can write to us using the form below.
        See you soon!

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          Foundry sands are high-quality silica sands used for foundry casting processes.

          With the aim to supply precision during the casting phase, the granulometry of this sand needs to be homogeneous. After the casting process, sand can be reclaimed and reused.

          And that’s where Virto-Cuccolini’s tumbler comes into play!

          Watch this video to check our sieving process for foundry sand with our T-Line tumbler, the right type of sieving technology for this job! We could create here up to 3 different products with 2 cut points.

          Are you looking for a suitable solution to improve the particle size precision of your foundry sands? Please contact us by using below form and we’ll be happy to assist!

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            Meshes are the heart of the sieving process.

            As fundamental as they are, they also happen to be quite delicate and need special care.

            Once a Virto-Cuccolini sieve or screen leaves our factory, meshes are out of the manufacturer’s responsibility exactly as it happens with tires when you buy a new car. A tire puncture can happen to anyone.

            So, we asked ourselves: “How to support our Customers in such a way, that they can learn and apply mesh protection measure easily?”

            We came up with creating this booklet: “Care and maintenance of sieving meshes, the core of the separation process” in 6 languages (Italian, English, Spanish, French, German and Russian), with an overview of all tips and instructions to take care of your meshes.

            Starting from this month of March 2021, this booklet will accompany our use and maintenance manuals to make sure that sieves’ operators are well aware of the care required by meshes within the sieving process.

            And should you need any further support, of course the Virto-Cuccolini team is available for any question! Drop us a line using the form here below and we’ll be happy to contact you.


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              Dear Customers, Suppliers, Partners,


              It is with great pleasure that I welcome my appointment as CEO of Cuccolini Srl by the Company’s owner, Virto Group. When I started my cooperation with Cuccolini as a strategy consultant back in 2018, I could not imagine that about 30 months later I would have been entrusted to cover this role – moreover, during a period while the whole world is going through a great, historical change in business dynamics.

              Virto-Cuccolini is undergoing a complete transformation, which these challenging times have given the advantage to come at the right moment. Not only we are reorganizing our market presence by consolidating and building upon the experience created during 30 years of sieves supplies to a wide and multifaceted range of industries; we are also doing this by constantly adapting ourselves to a new mentality, which puts change at the centre of our daily routine.

              Change pushes people to measure their abilities within a different context than the usual one. This enables learning new skills and looking at reality from different perspectives. It helps to open our minds and to find a new balance, clearing out our thoughts towards what matters. Our team proved to be the right one to follow this journey and therefore, is set to let the Company grow faster than expected.


              Within such a context, investment is the key. As long as trusted people are able to keep doing their daily job by tackling any issue that may arise in an unstable environment like the one we are living in, it means that a solid basis is available to look ahead and plan the immediate future. This is Virto-Cuccolini now, and we are happy to serve the market every single day of this unpredictable era.

              I thank Virto Group and the Cuccolini team for their constant support and shared responsibility in going through this unbelievable challenge. I am happy to offer my 20-year long experience in Bulk Handling Industry with the aim to support the Company reaching their growth objectives.

              May year 2021 be a fruitful one for all of our Customers, Suppliers, Partners and Stakeholders!

              Ms Katia Motta

              CEO & General Manager

              Cuccolini Srl – Virto Group

              December 2020

              Safety sieving is one of the most common industrial sieving processes.

              The aim of safety sieving is to intercept coarse particles like insects, metal or plastic particles, coarse particles in general, whose presence may cause the main product to lose its quality.

              In safety sieving, the oversize product is generally limited with respect to the main product (the undersize, in this case).

              How has Virto-Cuccolini created its VP2 series for safety sieving?

              Of course, we have taken into account many aspects:

              • the high speed of this process, which shall not slow down the speed of the whole production line
              • the generally high flow rate required for the main, undersize product
              • the typical installation context of such a process, which requires limited space
              • the easiness of maintenance: which may not be frequent, but shall be carried out quickly

              And that’s how our VP2 series was born!

              If you want to observe our sieve more closely, you can have a look at below video:

              Would you like to learn more about our VP2 series? Fill in below form and contact us, we’ll be happy to come back to you with all the info you may need.

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                Looking back at the last six months, Virto-Cuccolini’s team could reach important results even during such challenging times like the Covid19 emergency.

                Despite the closing of our production activities for three weeks and a limitation for a further three weeks following Government Decrees in Italy, our thoughts were focused on maintaining stability and development in our business.

                Therefore, all Company’s Departments reorganized their work to maintain the original schedule, with the result that we were also able to speed up our program!

                And here are our achievements:

                – enhancement of our pneumatic conveying series with the designing of one new model (currently under testing)

                – completion of the VP1 size 1200 project, with the first machine delivered in August 2020

                – technical improvements to our VTU tumblers and VPF pharmaceutical sieving equipment range

                – creation of a new brand and catalogue for our ceramic machinery range (here our new dedicated website)

                – testing of new applications in our lab

                – improvement of our production planning, with a general average reduction of 2 weeks lead-time

                All this was achieved while we were putting in place and maintaining all necessary health and safety rules decided by the Italian Government.

                As we learned during this extraordinary situation, remaining focused on our business even during such unforeseeable circumstances was key to keep the business going and fruitful. Being forced to work at a distance also contributed to enhancing our teamwork and sense of belonging to a common project.

                Would like to learn more about our most recent products or in general about our news? Write us a message using the form here below, and we’ll be happy to reach out to you at soonest!

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                  Mechanical vibration is a measure used to create movement in a specific product during its processing.

                  In the case of vibrating sieves and screens, the vibration is created with the aim to randomly move the particles of a product on a mesh table or deck, which is meant to retain the bigger particles which cannot flow through the mesh’s apertures.

                  Vibration can be gentle or hard, depending on the aim of the process and on the force necessary to achieve a free movement of the particles on the sieve.

                  Is it possible to sieve a fragile product and maintain its physical characteristics unaltered throughout the process?

                  After our decades-long experience with many different products and applications, we can say – yes, it is.

                  Here are three enlightening examples:

                  These three cases all have in common the goal, not just to separate the product of main interest from the by-product (coffee grains from coffee grain fragments; live larvae from sawdust; spirulina algae from their cultivating water); but also to maintain the product’s physical characteristics completely unaltered.

                  Thanks to the specific focus that Virto-Cuccolini’s technical team is dedicating to each application we are required to test, it is possible to achieve a suitable configuration of the main elements which are responsible for vibration in a sieve: the motovibrators’ power and masses; the tension of the mesh; sometimes, also the type of mesh can make a difference.

                  Are you thinking of sieving a fragile product and you are not sure it can work? Contact us to organize a test and we can check together how to configure the best possible solution for your needs!

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