Previero | Sorema

Who is Previero?

Previero, based in Anzano del Parcoist (Como), Italy, is a third-generation family business. In the early 1920s, Natale Previero began representing machinery for the textile and wood industries in the Como area. The first documented reference in the Alzate Brianza archives describes the start of the business in 1922. At the same time, Natale Previero opened a mechanical workshop with attached offices for the maintenance and repair of machinery for the textile and wood industries, the predominant sectors in Como at the time.

In 1950, Natale's son Oscar decided to invest in the development of machinery for plastics recycling, a young but rapidly expanding industry. And so the headquarters were moved to Lipomo. This marked the beginning of the construction of various machines, including the first granulator.

In the seventies, production concentrated on grinding and cutting machines. At the beginning of the seventies, Oscar's three sons (Flavio *1951, Aldo *1954 and Dario *1958) took over the management of the company and have since successfully continued the activities of their father and grandfather. Highlights include
 

• the construction of the offices and factory in Alzate Brianza and Anzano del Parco
• the installation of the CAD 3D systems
• the installation of the CAM machines
• the market research to optimise the products
• the ISO 9001 certification

In 1992 Previero acquired the shares of Domenico Gazzoni's Sorema subsidiary. The Sorema machines for plastic recycling are currently being built in the Anzano del Parco workshops. With Previero as the parent company the Sorema brand represents Previero's specialization in the area of plastic recycling. As the relationship between Previero and Sorema is synergistic, Previero machines are not only compatible with Sorema installations but play a crucial role in Sorema plastic recycling plants; Previero shredders and granulators are used for size reduction of the plastic waste, making it suitable for further processing. Hence a typical Sorema PET bottle recycling line might include a Previero granulator at the beginning of the process to prepare the plastic material for washing and separation.

 

THE MACHINES

Water mills

General characteristics
 

• Robust casing with inspection doors communicated.
• Base for mill, motor and hydraulic control.
• Motor with adjustment slide for tensioning the V-belts.
• Mechanical locking of the sieve basket.
• Hydraulic hopper opening.
• Hydraulic control.
• Hydraulic sieve opening.

 

STANDARD EQUIPMENT

Cutting chamber:

508 series with Ø 450 x 800 rotor.
The following models are available:
 

• MU 508 R3: semi-open rotor with 3 rotor knives.
• MU 508 R5/H: open rotor with 5 rotor knives, double helical cut

Series 610 with rotor Ø 550 x 1000
The following models are available:
 

• MU 610 R3: semi-open rotor with 3 rotor knives
• MU 610 R5: open rotor with 5 rotor knives
• MU 610 PRT: semi-closed rotor with 3 rotor blades

Series 812 with rotor Ø 750 x 1200
The following models are available:
 

• MU 812 R5: semi-open rotor with 5 rotor blades
• MU 812 R6: open rotor with 6 rotor blades
• MU 812 H: open rotor with 6 rotor blades

Series 916 with rotor Ø 850 x 1600
The following models are available:
 

• MU 916 H: open rotor with 7 rotor blades
• MU 916HS: open rotor with 7 rotor knives

 

Multipurpose mills

STANDARD EQUIPMENT

SERIES N

Suitable for any production need.
Flexible and easy to install.

SERIES M

Ideal for recycling plastic and rubber scrap.
Suitable for any type of product.

SERIES MS

High performance, with low energy consumption.
Mills for higher production and automated systems

SERIES P

For the most difficult applications and heavy loads.
Oversized mechanics.
Particularly suitable for blocks.
 

SPECIAL MODELS

MÜLOTS SERIES TO

These mills are designed for the production of granules from pipes and profiles with different diameters and a length up to 6.5 m.
The automatic feed with horizontal impact also allows the recovery of blocks and other production waste.

Three models available:
 

• MU 100/80: for pipes up to Ø 600mm
• MU 120/100 TO: for pipes up to Ø 800mm
• MU 180/150 TO: for pipes up to Ø 1350mm

 

MŰHLEN SERIES AS

The oleodynamic tilting of the cutting chamber guarantees particularly easy access and cleaning, which cannot be compared to conventional mills.
 

• Motor with adjustment slide for tensioning the V-belts.
• Mechanical locking of the sieve basket.
• Hydraulic hopper opening.
• Hydraulic control.
• Hydraulic sieve opening.

 

STANDARD EQUIPMENT

Cutting chamber:

508 series with Ø 450 x 800 rotor.
The following models are available:
 

• MU 508 R3: semi-open rotor with 3 rotor knives.
• MU 508 R5/H: open rotor with 5 rotor knives, double helical cut

Series 610 with rotor Ø 550 x 1000
The following models are available:
 

• MU 610 R3: semi-open rotor with 3 rotor knives
• MU 610 R5: open rotor with 5 rotor knives
• MU 610 PRT: semi-closed rotor with 3 rotor blades

Series 812 with rotor Ø 750 x 1200
The following models are available:
 

• MU 812 R5: semi-open rotor with 5 rotor blades
• MU 812 R6: open rotor with 6 rotor blades
• MU 812 H: open rotor with 6 rotor blades

Series 916 with rotor Ø 850 x 1600
The following models are available:
 

• MU 916 H: open rotor with 7 rotor blades
• MU 916HS: open rotor with 7 rotor knives

 

Multipurpose mills

STANDARD EQUIPMENT

SERIES N

Suitable for any production need.
Flexible and easy to install.

SERIES M

Ideal for recycling plastic and rubber scrap.
Suitable for any type of product.

SERIES MS

High performance, with low energy consumption.
Mills for higher production and automated systems


SERIES P

For the most difficult applications and heavy loads.
Oversized mechanics.
Particularly suitable for blocks.
 

SPECIAL MODELS

MŰLOTS SERIES TO

These mills are designed for the production of granules from pipes and profiles with different diameters and a length up to 6.5 m.
The automatic feed with horizontal impact also allows the recovery of blocks and other production waste.


Three models available:

• MU 100/80: for pipes up to Ø 600mm
• MU 120/100 TO: for pipes up to Ø 800mm
• MU 180/150 TO: for pipes up to Ø 1350mm

 

MŰHLEN SERIES AS

The oleodynamic tilting of the cutting chamber guarantees particularly easy access and cleaning, which cannot be compared to conventional mills.
Suitable for high production with frequent colour and material changes.

Two models available:
 

• MU 420 AS: with runners Ø 400 x 2000mm
• MU 816 AS: with runners Ø 800 x 1600mm

 

MŰHLE SERIES DR

Innovative pelletising concept with two runners.
The large dimension of the cutting chamber guarantees high performance with voluminous materials.
Two models available:
 

• DR 242: with cutting chamber: 800 x 1200mm
• DR 225: with cutting chamber: 1000 x 1500mm

KLINGEB - PULVERISER SERIES PZ
Two available models:
 

• PZ 502: with runners 500 x 200mm
• PZ 506: with runners 500 x 600mm

 

PRE-SHREDDER

SERIES 2800S

Standard equipment
 

• Large-volume hopper for vertical feeding Oversized construction with bearing seats designed for high and intensive loads.
• Hydraulic direct drive of the rotor with adjustable speed start-up under full load, hydraulic torque control, reversal of the direction of rotation to eliminate any blockage.
• Fixed blade movable, on hydraulic springs.
• Deactivates the cutting process when foreign bodies are not to be shredded.

Cutting chamber

- Rotor ø 750 x 2000 mm available in various configurations with different knife sizes.
- Rotor knives can be used four times.
- Hook-shaped special knives and knives in tungsten carbide on request.
- Fixed knives with adjustable gap and regrindable
- Installed power from 90 to 300 kW, depending on application


SERIES PR
Standard equipment:

• The single-rotor shredders are specially designed for the pre-granulation of numerous types of material.
• By installing a PR series shredder from Previero, the granulation or pre-treatment lines of the recycling plants can be automated.
• Feeding the mill with shredded material increases productivity and reduces energy consumption.

Applications
 

• Plastic films
• Pressed parts
• Copper and aluminium electrical cables
• Bottles
• Bituminous wrappings
• Bales of plastic film
• Paper and cardboard packaging

 

Operating principle

• The material loaded in bales or with the spider is gradually shredded by the rotor.
• With each revolution, the rotor cuts a quantity of material corresponding to the cross-section of the rotating blade.
• The best possible cutting efficiency is achieved by selecting the shape and number of blades depending on the application.
• This characteristic mode of operation of the single-rotor shredder means that the material feed is controlled by the machine itself, which eliminates any risk of clogging.

 

Advantages

• Double direction of rotation to avoid material jams in the hopper.
• Mode of operation with different cycles depending on the type of material, start-up with full hopper, reversal in case of overload.
• The special blade profile and special wear protection labyrinths avoid winding on the rotor flank of fibre or film material.
• Easy opening of the machine for cleaning and blade change.
• Quick and easy change of rotating and fixed blades.
• Low rotating speed with reduced blade wear and consumption.
• Specially designed blades with reduced construction and grinding costs.

 

 

STRAND GRANULATORS

Series for medium production capacities

TA 200NA with blade width 200 mm
Available with
 

• Cutter rotor of 30 and 40 blades.
• Rotors with 8 and 18 bolted knives.
• Rotor with 26 knives with wedge fastening.

Options
 

• Fixed knives with tungsten carbide.
• Upper feed rollers with special polymer coating.
• Upper feed rollers with spring washers.
• Complete construction in stainless steel.
• Control with two frequency converters for the production of variable pellet lengths.

 

Knives

• Knives in stainless steel with cutting edges in Stellite.
• Knives made of hardened special steel with increased service life.
• Knives made of tungsten carbide.
• Knives with PVD-TiN surface coating.

For high production, available in three models:

• TA 400 G with blade width 400 mm
• TA 600 G with blade width 600 mm
• TA 800 G with blade width 800 mm

Available with
 

• Cutter rotor of 40 and 50 knives.
• Rotors with 8 and 27 bolted knives.
• Rotor with 40 knives with wedge fastening.

Options
 

• Fixed knives with tungsten carbide.
• Upper feed rollers with special polymer coating.
• Upper feed rollers with spring washers.
• Complete construction in stainless steel.
• Control with two frequency converters for variable production.

 

Knives

• Knives in stainless steel with cutting edges in Stellite.
• Knives in special hardened steel with increased life.
• Knives made of tungsten carbide.
• Knives with PVD-TiN surface coating.

 

TA 1000 PRS

For polymerisation lines and very high production.

With

• cutter rotor of 50 knives
• Rotor with wedge fastening

Options
 

• Fixed knives with tungsten carbide.
• Upper feed rollers with special polymer coating.
• Upper feed rollers with spring washers.
• Complete construction in stainless steel.
• Control with two frequency converters for the production of variable pellet lengths.

Knives
 

• Knives in stainless steel with cutting edges in Stellite.
• Knives made of hardened special steel with increased service life.
• Knives made of tungsten carbide.
• Knives with PVD-TiN surface coating.

 

SLICING MACHINES

SERIES H
For medium
 

• production capacity
• Knife width: 500 mm.
• Max belt width in infeed: 450 mm.
• Available in different models with many cutting sizes.
• Easy to install, the H series is suitable for all production requirements.

 

Options

• Water cooling of the knife packs
• Fixed knives with four cutting edges
• Hydraulic quick lifting and blocking device for the upper knife pack.
• Central lubrication.
• Stainless steel construction.
• Release agent metering device.
• Vibro classifying sieve.

 

SPECIAL VERSIONS CU/MU

Belt granulators of the H and S series can be combined with granulators in applications where the particle size is crucial and no screens can be used due to the product characteristics.


TYPE S
 

• For high production rates
• Knife width : 950 mm
• Max belt width : 850 mm
• Available in different models with many cutting sizes.
• The S series is suitable for high and intensive production requirements, with no restrictions on material change flexibility.

Options
 

• Water cooling of the knife packs.
• Fixed knives with four cutting edges.
• Hydraulic quick lift and blocking device for the upper knife pack.
• Central lubrication.
• Separating agent dosing device.
• Vibro-classifier.

 

Disc mills

Applications
 

• The disk mill is used for fine grinding of plastics, elastomers or thermoset resins as well as chemical products.
• The machine is suitable for all applications where finest granules are required.

Functional principle
 

• The material is fed in centrally and forced to pass between the two discs by rapid rotation.
• Due to the special tooth profile, the material is progressively reduced to dust.

Advantages
 

• Easily replaceable and regrindable sector discs.
• Easily adjustable clearance between the discs.
• Efficient water cooling of the rotor and the fixed disc.
• Different tooth profiles for different types of material

 

Compactors

 Working methods
 

• The Tramu is a series of continuous agglomerators designed for compacting a wide variety of materials such as films, monofilaments and fibres.
• The special profile of the screw and cylinder creates a high compression of the material, which agglomerates thanks to the heavy heat generated.

 

Advantages

• Compact design, wide range of applications, low maintenance requirements and easy integration into automatic continuous lines.
• Compared to other systems, the low speed guarantees minimal thermal stress on the material.
• Electric resistance heating bands compensate for the heat requirement in case of output fluctuations or changes in the quality of the feed material.
• The Tramu eliminates residual moisture in the material and makes it possible to achieve an optimum bulk density of the compacted material.
• Consistent energy consumption.

 

Applications
With hot granulator

This solves the problem of drying and storing the material in film recycling plants. The moist and voluminous carving material is compacted, dried and granulated, obtaining a product that can be:

• can be stored in larger quantities and homogenised in conventional mixing silos.
• is easily drawn in by extruders, improving production consistency and quality.
• can be transported, ensiled and bagged like any plastic granulate.

Flanged to an extruder
The material is fed in free fall without a tamping unit. The lateral discharge opening conveys the melted material into the feed opening of the extruder.
 
The degassing removes the moisture and the developed gas, in case of agglomeration of voluminous materials.
The additional degassing improves the quality of printed and moist material.
 
Degassing for Tramu 250 and Tramu 300
 
Degassing ensures high quality of the finished product in extremely critical operating conditions with very moist thin, pressed and/or mixed films.

 

Types

 TRAMU 200

This machine is designed for outputs from 500 to 1200 kg/h; depending on the material and the percentage of moisture.
 
TRAMU 250

It is used in lines with a capacity from 750 to 1500 kg/h, according to the material and the percentage of residual moisture.
 
TRAMU 300

It is specifically designed for plants with high accumulation capacity. As for the other models, the capacity varies from 1500 to 3000 kg/h depending on the material and the humidity.

 

RUBBER MILLS

 GRINDING PLANT FOR NATURAL AND SYNTHETIC RUBBER FOR THE PRODUCTION OF ADHESIVE MASSES

Applications

• The natural and synthetic rubber bales are prepared on the stacking belt.
• The grain size of the ground product can vary according to requirements and can require single or double granulation.
• A storage device with different capacities can be installed, equipped with technology for rapid loading of the solvent containers.
• The operation of the system is fully automated by PLC.
• Dosing systems for liquid or powdered release agents are available.
• This system is now used by all major producers of adhesive tapes to drastically reduce solvents without affecting the quality of the final product in the slightest.
• set-up options and production capacities are available.

Advantages

Automatic loading of the solvent tank without the need for operators
Reduction of solvents
Fast loading possibility

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How you benefit from Spare parts by CUTMETALL

CUTMETALL products: More than a spare part! Tuning for your machine!

Our spare parts and wear parts are not original equipment manufacturer items (original parts of the machine manufacturers) but rather process-optimized CUTMETALL own brands: A perfect fit. Durable. Economical.

CUTMETALL - partner, problem solver, and process optimizer for the recycling and shredding industries.