Extrusion International 5-2016

MAS:

new generation of extruder

and melt filter series

he Upper Austrian manufacturer of extrusion solutions

"MAS Maschinen- und Anlagenbau Schulz GmbH" will

present themselves 10 years after the company was founded

with an entirely new design at the K-2016. Now, an establis-

hed supplier of unconventional but proven technology suc-

cessful in many applications. The conical co-rotating

twin-screw extruder holds the central position in the portfolio

of MAS. Its gentle plasticization behaviour paired with very

large feeding opening makes it perfect for all extrusion appli-

cations that require the highest degree of thermal and me-

chanical polymer protection. This is especially the case for

recycling and compounding applications as well as for film ex-

trusion. 110 delivered units in ten years document that the

young company's development is on the right track and sets

a clear path for the future. The water-less DRD (Double-Rotor-

Disc) cleaning and drying system for film flakes and regrind

material, which has been offered since 2006, is as innovative

as it is new. More than 50 of these machines have been taken

into operation so far. The third pillar is the continuous melt fil-

ter, which was introduced in 2011. The construction principle

allows customers to individually adjust the filtration system ac-

cording to the contamination that has to be removed, in order

to ensure an effective as well as efficient filtration process.

MAS 24: conical, co-rotating twin-screw extruder in lab scale

The MAS 24 lab extruder has been developed specifically for

plastics manufacturers and compounders to develop recipes

in a practically oriented manner and produce them in very

small volumes. The highly compact build with a screw length

of just 400 mm and conical screws with a diameter of 48 mm

narrowing down to 24 mm are equipped with exchangeable

mixing elements, just like the larger types. The very large fee-

ding opening makes it possible to process in particular re-

grind, flaky and finely cut film material very well. Another

essential benefit is that the MAS system allows full control over

the shear strength and thus the melt temperature of the ma-

terial by varying the screw speed at unchanged feed rate (ad-

justable up to 300 rpm). Accordingly, the possible output is in

the range of 10 to 35 kg/h of the laboratory extruder. The

MAS 24 lab extruder will be presented in operation at the

trade fair stand in combination with an underwater pelletizing

unit.

MAS 75 – the new MAS extruder generation

The third generation of the conical co-rotating twin-screw ex-

truders is available in six different sizes, with output ranges

from 10 kg/h to more than 2,000 kg/h. The outer characteri-

sing feature of the new extruder generation is its new, ergo-

nomically optimised machine design. The most important

advanced technical development is the segmented cylinder

construction that is made up of several partial sections. It per-

mits the exchange of individual cylinders sections subject to

particular stress from abrasion instead of having to replace the

entire cylinder, or selective application of individual cylinder

sections with a special wear protection. The new series is pre-

sented by the example of an MAS 75, which is suitable for an

output of up to 1,100 kg/h (Fig. 2).

It should be noted that MAS has held the FDA "No Objection

Letter" for food grade recycling of PET since mid-2015, and

further meets all EFSA criteria.

CDF – continuous melt filter – the latest generation

The CDF (Continuous Disc Filter) melt filter series developed

by MAS is one of the leading continuous filter systems for re-

cycling applications globally available. The system has reached

this status in part thanks to its concept that permits previously

unachieved filter surface sizes. The smallest size CDF 300

works with a 300 mm disc at 792 cm² filter surface and is suit-

able for a melt throughput from 300 to 700 kg/h. All other

Fig. 1: The lab version of the conical co-rotating twin-screw

extruder type MAS 24 is characterised by a plasticising

unit that is just 400 mm long

Extrusion International 5/2016