The same geometric design across the series. Reliable scale up. Gradual size increases in the ZSK MEGAvolume series always makes it possible to obtain the ideal size.

Modular principle for optimal operational configuration.

The ZSK series is built on a modular system. The advantage of this mo-dular principle is the many configurations in the process sections that allow the best com-bination for every application. All processing tasks can be optimally accomplished with only a few barrel and screw variations. The reason: barrels and screws are precisely and individually configured for the respective process application. The process section is always only as long as necessary and as short as possible.

The process section of the ZSK consists of many barrel sections in which the co-rotat-ing screws operate. The closely intermeshing screws with their tight self-wiping profile eliminate dead zones over the whole length of the process section. The effect: consistently higher degree of process reliability and optimal self-wiping.

Intermeshing profile of the ZSK MEGAvolume.
The diameter ratio Do / Di determines the free volume of a closely intermeshing, co-rotating twin screw, at a given shaft centerline distance.
The greater free volumes of the ZSK MEGAvolume is obtained by increasing the ratio between outer diameter, Do and inner diameter, Di.

As flexible as the applications – barrel sec-tions completely according to requirements..

The modular principle of the barrel sections permits precise sequencing for each applica-tion. Each barrel section´s temperature can be maintained separately. Heating usually takes place electrically with heater shells and / or heater cartridges. Cooling is done with water or steam. Barrel sections as well as screw and kneading elements are made out of nitrided steel in the standard version. In the extremely wear resistant and corrosion resis-tant version, they are made out of the corre-sponding suitable materials.

Standard barrel section:

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for product feed intake, atmospheric or vacuum ventilation or degassing

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with ports

- for liquid injection or steam - for measuring the product temperature - for measuring the product pressure

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for Closed barrels

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for connecting side feeders.

Closely intermeshing, co-rotating twin screws for flexible process zones.

The screws in the ZSK MEGAvolume consist of solid shafts each with an individually configured sequence of screw and kneading elements. The freely selectable order of screws and kneading ele-ments assure the process sections mate with the process configuration. Thus, different pro-cess zones can be set up, interchangeably, each according to the requirement for

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Conveying

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Plasticizing

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Mixing and shearing

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Homogenizing

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Degassing

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Building pressure.

Capacity Ranges for Continua, ZSK MEGAcompounder and ZSK MEGAvolume.

Gentle handling of product and low shear stresses.

The allowable torque is a crucial parameter for the performance that can be achieved. Allowable torque and speed determine the possible drive power, along with the achievable degree of fill in the screw. A high degree of fill which results in a lower average shear rate provides gentle product treatment. The high torque of the ZSK MEGAvolume allows a higher degree of fill in the screw channels, at the same screw speed.

The advantage: higher throughput at the same speed, and / or lower screw speed with the same throughput.

Balanced ratio of large screw volumes and high driving power.

The diameter ratio of the ZSK MEGAvolume is designed for maximum free volume: The ratio D_o / D_i of 1.8 determines the free volume of the twin-screw, at a given centerline distance.

Maximum efficiency through well matched auxiliary equipment.

The full benefit through a coordinated design of the peripheral equipment. More efficient processes through Coperion know-how in plant design.

Twin-screw side degassing ZS-EG.
Twin-screw side-feeder ZS-B.
Pelletizing knives.