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捲膜式薄膜

Alfa Laval manufactures a comprehensive range of spiral membranes which are widely used for many applications within the food, beverage, dairy, biotech and pharmaceutical industries. The Alfa Laval spiral membranes are available for all cross-flow filtration processes and with different combinations of membrane, diameter, length and spacer. The spiral membranes all feature a full-fit sanitary design

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Fine-tuned filtration

Membrane filtration separates out the different components in a feed stream on the basis of the size and shape of the micro-particles within it. And the better the filtration, the better the quality and value of your end product.

The unique design of Alfa Laval spiral membranes makes sure the feed stream passes through the spiral membrane under the best possible flow conditions. The ensures the most efficient separation and superior flux, and that each spiral membrane has a long service life and is easy to clean.

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Flow pattern in a spiral membrane from Alfa Laval. Red is feed/retentate. Yellow is permeate

How it works

The core of each spiral element is a perforated central tube, with large membrane pockets attached. Each of these contains a spacer net that transports the permeate out of the membrane pocket and into the central tube.

Different thicknesses of spacer net between each pocket make sure the feed is evenly distributed over the entire surface of the membrane.

The special tight-rolling technique used in Alfa Laval spiral-wound membranes provides the maximum possible active membrane area, which provides correspondingly high permeate capacity. The exceptional firmness characteristics of Alfa Laval spiral-wound membranes ensure long service life and fewer channelling problems, even if a high pressure drop across the element.

Compliances

All materials used for the production of Alfa Laval membranes, in both spiral-wound and flat-sheet designs and configurations, comply with EU Regulation (EC) 1935/2004 and Commission Directive 2002/72/EC as well as FDA regulations (CFR), Title 21. The membranes are thus suitable for use within food and pharmaceutical processing applications.

These compliance also extend to the equipment and fittings related to membrane operations, including items such as plate-and-frame units, element housings and pumps.

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