Extrusion International 5-2016

sizes use a 510 mm filter disc. Specifically, the CDF 500

with one disc offers a filtration area of 1,640 cm² for

700 to 1,600 kg/h. The next-larger filter type, CDF-500-

D with two parallel discs, offers twice the filter surface

at 3,280 cm² and permits a throughput of 1,300 to

2,000 kg/h. The largest filter unit with the type desi-

gnation CDF-500-D-P consists of two parallel CDF-500-

D units with a total of 4 filter discs and a filter surface

of 6,560 cm² with a possible melt throughput of up to

4,000 kg of polyolefins per hour, which makes it cur-

rently one of the highest-performing units of its size on

the market.

The basic concept of the filter is a circular carrier plate rotating

in a melt-conducting housing with an exchangeable filtration

disc. The filter disc is made of surface-hardened steel and avai-

lable in filtration fineness ranging from 90 to 750 µm. The fil-

tration disc in the housing continuously transports the

contamination towards the scrapers, which lift the contami-

nation from the screen surface and feeds it to a discharge

screw.

One of the latest developments for the CDF filter is the pneu-

matically actuated scraper system. This latest feature allows

dynamic control of the actual pressure exerted on the scrapers

clearing the contamination from the filter surface. This unique

development allows quick changes in setup for different melt

pressures and levels of contamination offering wider process

windows adjustable ‘on the fly’. In cases of more heavily or

varyingly contaminated melts, an adjustable fluctuating scra-

per pressure can be implemented in order to remove the ad-

ditional impurities and keep a stable process without causing

excessive wear on the filter disc.

Further features of the latest filter generation include optimi-

sed melt channels inside the housing to minimise melt pressure

as well as a new heating layout with heating plates and hea-

ting bands instead of heating cartridges to improve the hea-

ting coefficient. (Fig. 2).

Fig. 2: At its 10th anniversary, MAS presents itself with

a new corporate design and a new machine design

for the extruder and melt filter series

Hall 9, Booth D42

➠ www.mas-austria.com

The Japan Steel Works:

TEX25

III

high-performance twin-screw extruder

he Japan Steel Works, Ltd. JSW, shows its TEX25

III labo-

ratory extruder with a special side feeder, the compoun-

ding range of which extends to super engineering plastics and

rubber/elastomer compound. The compact 26.5 mm diame-

ter co-rotating twin-screw extruder (first worldwide debut in

2014), for product development of various compounds and

masterbatches in engineering and high performance thermo-

plastics is the smallest one of eight types in the TEX-

III series

(up to 129.5 mm diameter) available in Europe.

The TEX25

III compounding range covers all general pur-

pose/engineering plastics recipes and extends to super engi-

neering plastics such as PEEK, PPA, PPS, LCP, PEI, and PI, also

rubber/elastomer compound such as TPV. This makes the

compounder ideal for research and development with fre-

quent material and process changes, as cartridge heaters and

a barrel clamping mechanism enable easy and rapid barrel sec-

tion block changes., The total screw length/diameter (L/D) ra-

tios can be selected from 42 with 12 blocks, 52.5 with 15

blocks, and 70 with 20 blocks. The machine accommodates

TEX25

III, co-rotating twin-screw extruder

Extrusion International 5/2016