Plasticizing screws

One of the fundamental characteristics of plasticizing screws is that of having a high mixing and homogeneous melting capacity suitable for the transformed polymer.

It is for this reason that the geometric profile of the screws is a fundamental element both for the creation of a quality product and for obtaining economic advantages , reducing production waste, reducing cycle times and facilitating energy savings. .

The continuous research and development activity, combined with the deep knowledge of the lamination process and the thousands of experiences of individual customers, allow us to develop screw profiles and geometries suitable for every need and application.

General purpose screw

General purpose screw

Screw with universal three-zone profile , suitable for the transformation of most existing polymers. It turns out to be a good compromise for almost any application thanks to its standard profile.

Special Screws

Special Screws

BRIXIA PLAST is able to produce screws for special applications, including screws with degassing, screws for PVC, screws for extrusion, rubber, thermosetting and latest generation biodegradable materials.

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Dedicated Screws

The wide range of polymers and applications existing in the plastics processing industry requires screw profiles often dedicated to specific projects or applications : mixing screws, double-pitch screws or screws with special compression ratios, and screws with profiles created ad hoc the result of Brixia Plast ‘s experience and innovation.

Multi Compound Screw

Multi Compound Screw

Screw with innovative geometry, with very high plasticizing capacity. The result of years of experience, this screw can be used with multiple polymers: from classic polyolefins (PP, PE) to technical materials (including nylon), up to transparent materials. Final mixers can be added to this screw geometry.

Brixia plast Multi Compound Screw

Multi Compound Screw

The flagship of BRIXIA PLAST’s research and development, and by now strong of a positive feedback on the market, the MULTI COMPOUND screw represents a solution with high efficiency performance, suitable for different types of polymers.

Its main advantages are as follows:

• High plasticizing capacity

• Better homogenization of the polymer and additives

• Reduction of back pressure

• Reduction of the necessary engine torque

• Reduction of molding temperatures

• Reduction of lamination time

These advantages contribute to obtaining a high quality of the molding process and of the finished products, as well as a considerable energy saving.

Steels for screws

LK3convenzionalenitrurazione950 - 1100 HV
K55convenzionaletempra58 - 62 HRC••••
SLPconvenzionaletempra58 - 60 HRC•••••
VDXpolveritempra62 HRC•••••
STXinoxtempra50 - 52 HRC•••••
M390polveritempra58 HRC••••••••

Welding overlays

SPJ12Co42 - 46 HRC••••••
LF5Fe58 - 62 HRC••••••
LF56Ni59 - 54 HRC•••••••
LF83Ni - Wc67 - 68 HRC••••••••

Coatings and Treatments


PVD (Physical Vapor Deposition) technology is a coating process that uses vacuum systems for the vaporization of a solid metal into a plasma of atoms or molecules. These molecules, vaporized, are deposited as a coating on the surface of conventional steels and more. The technology allows to obtain very high performance coatings , with a thickness in terms of microns, which does not alter the size of the piece.


The thick chromium coating by means of a galvanic process is suggested in those plasticization cycles in which on the one hand it is necessary to reduce the friction coefficient and on the other hand protection against high corrosion and oxidation phenomena is required.


The NpR treatment is a thermochemical treatment (Fe O base) proposed to counteract wear by increasing the surface hardness and decreasing the surface friction coefficient . It reaches a hardness between 850 and 900 HV and has a thickness of 4-5 µm. This treatment is mainly used on screws of important dimensions , where it is not possible, for reasons both of technological and economic limitations, to propose a coating with PVD technology.

Comparison table

CroXPVD0,32 - 5 µm2000 - 2500 HVarcobaleno
TiNPVD0,452 - 5 µm2000 - 2500 HVoro
AproPVD0,352 - 5 µm2800 - 3000 HVgrigio
CrMTrattamento galvanico0,170,2 - 0,3 mm900 - 1000 HVargento
NpRTrattamento termochimico0,454 - 5 µm1200 HVnero
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