Extrusion technology

Bandera designs and manufactures standard and special single screw extruders, counter rotating extruders, twin screw extruders and co-rotating twin-screw extruders, mainly for blown film extrusion, foil extrusion and sheet extrusion, pipes extrusion, and for any other possible application in plastics.

Standard production range includes 55mm, 70mm, 85mm, 105mm, 135mm and 170mm diameter sizes in 18 L/D, 34 L/D, 42 L/D and 52 L/D versions, with output capacity between 300 and 3500 kg/h, depending on the specific features of the process materials.
Bandera is the only Italian manufacturer with own in-house manufacturing capacities and relevant quality check of extrusion screws, extrusion barrels and extrusion heads.

Extrusion screws consist of splined shafts with a number of conveying and mixing modular sections, made from tempered wear-resistant steel.

Extrusion barrels are offered in nitrided steel or with interchangeable sections made from wear-resistant material.
The design of special and customized screw profile maximizes process performances in combined applications of extrusion technology and a certified process and the employ of cutting edge machinery and software guarantee an excellent quality level.

 

Click here for more info on single screw extruders

Click here for more info on twin screw extruders 

 

Foil & Sheet

 

Bandera manufactures complete extrusion lines for the production of high thickness windable single and multilayer foil and production of thick sheet. 

 

Click here for more info on Foil Extrusion Lines

Click here for more info on Sheet Extrusion Lines

Blown film

 

Costruzioni Meccaniche Luigi Bandera is recognized as market leader in design and manufacture of blown film machines (single layer film and multi layer film) for the production of finished technical packaging film, for application in food and medical-pharmacological fields, agrifilm, biodegradable film and thick film for the production of geomembranes intended for civil and industrial waterproofing systems.

Bandera innovative know-how and technologies are applied to cutting edge thermoplastic process for the production of HDBs, shoppers, and bags of different shapes and sizes, as well as shrink film, pallet wrapping and stretch hood.

Bandera technology has focussed on polymer treatment at the hot molten stage through extrusion head with shear rate and temperature control specifically intended for the production of film featuring minimized thickness tolerances and optimized optical/mechanical characteristics.

Bandera blown film extrusion lines are equipped with automatic quality control systems, such as loss-in-weight gravimetric dosing system, in-line film thickness measurement, automatic winding, supervisory system and user-friendly computerised line control.

 

Click here for more info on Techno Flex Plus 3 - 5 layers

Click here for more info on Techno Flex Plus 7 - 9 layers

Click here for more info on HDB Flex

Click here for more info on Smartflex®

Click here for more info on Agrifilm

Click here for more info on Geomembrane HDPE

Click here for more info on Automatic winder

Steel Pipe Coating

 

Bandera designs and manufactures complete extrusion lines for the production of HDPE, PPA and PPR, PVC, PEX, PP/AL/PE pipes for construction, telecommunication, waterworks, irrigation and drainage applications, besides mining industry, pneumatic and water systems and technical ducting fields, as well as multilayer film with barrier layer (PEX EVOH PE) for hydro and thermo-sanitary and industrial applications.

Bandera innovative know-how and related applied technologies in the latest-generation thermoplastics transforming field relies on special extrusion heads, designed with the support of simulation software to analyse melt rheology.

 

Bandera offers extrusion systems and complete lines for corrugated and/or spiral pipes for producing composite multilayer plastics/steel pipes and coating lines/heads for steel drawn products.

Production lines are equipped with automated quality control systems and user-friendly computer supervision system.

 

Bandera has been operating in the thermoplastic resin steel pipe coating for over 20 years, offering complete extrusion systems for outer thermoplastics (PE and adhesive) coating lines intended for steel pipes for ducting, especially in hydrocarbons transportation.

Coating lines are divided into:

Sleeve-type extrusion, with coating head intended for pipe diameters up to 24”

Side-banded extrusion (flat die head), for pipe diameters up to 80”

Bandera offers process solutions aimed at ensuring substantial savings in steel coating resins.

PET/PP Pelletizing

 

The Bandera production range includes co-rotating extruders in standard and special versions. Bandera production range is so wide as to cover all kinds of products connected with raw material direct extrusion.

 

Extruders are entirely designed and manufactured by Bandera. Standard production range includes 55mm, 70mm, 85mm, 105mm, 135mm, and 170mm diameter sizes in 18 L/D, 34 L/D, 42 L/D and 52 L/D versions, with output capacity comprised between 300 and 3500 kg/h, depending on the specific features of the process materials.

 

The HTS-series modular gear reduction units are suitable to any operating condition of any specific application.

Extrusion screws consist of splined shafts with a number of conveying and mixing modular sections, made from tempered wear-resistant steel.

Extrusion barrels, of the modular type as well, are offered in nitrided steel, or with interchangeable sections made from wear-resistant material.

PVC Pelletizing

 

Bandera designs and manufactures complete rigid and soft PVC pelletizing lines for several and various applications.

The core process consists of the twin-screw extruder featuring parallel counter-rotating twin screws with increased length (L/D 1:28). This extruder outstands for enhanced product quality (material jellification in the barrel is step by step and under lower stress conditions) and for high productivity with elevated flexibility in recipes.

 

The Bandera counter-rotating twin-screw can process both rigid and soft PVC with the same screw profile at high hourly outputs.

 

A standard complete pelletizing line includes:

Variable-speed horizontal volumetric dosing unit.

Variable speed force feeder for slow-flow dry mixes

Bandera parallel counter-rotating and intermeshing twin screw extruders for PVC powder and/or granule pelletizing from the 2B series comprise:

 

  • An open-structured electro-welded steel base frame to ease inspection interventions on speed reduction unit, torque distributor assembly complete with thrust block and closed-loop forced lubrication by on-board control station.
  • Extrusion barrel made from nitrided steel; alternatively, in case of heavy duty process requirements – e.g. process materials with fillers, or regenerated materials, etc. – the barrel can be manufactured in bi-metal alloy high resistant to corrosion and wear.
  • Barrel heating obtained by special ceramic electric resistance heaters equipped with special dissipator fins.
  • Thermoregulated extrusion screws made from nitrided steel, with wear resistant coating obtained by plasma welding.
  • Wheeled barrel withdrawal system to allow for screw and barrel convenient cleaning and inspection interventions.