Fiber and film industry

Filtration of sulfuric acid spinning bath

precipitation bath cleaning in the viscose fiber and film industry

Regardless of whether the end product is fiber, filament, sausage casing, or sponge, cellulose is precipitated in an acid bath.

These baths are contaminated with impurities and must be cleaned accordingly to prevent the contaminants from being transferred to the product and to ensure that these expensive chemicals can be reused.

Increased effort and complex systems.

In the past, sand filters have predominantly established themselves as state of the art, despite their considerable disadvantages.

Inadequate filtrate quality due to channeling in the sand bed, increased costs for replacing the filter sand, and the need for a complex recovery system are the main problems associated with this system.

Improvement of filtrate quality through precoat filtration.

Over the past two decades, more and more companies have switched from sand filter technology to precoat filter systems. These systems significantly improve the quality of the filtrate thanks to stable filter cakes, while also reducing liquid losses. In addition, the dry cake discharge eliminates the need for reject recovery.

The material mix of carbon steel with internal rubber lining and plastic inserts offers maximum chemical resistance.

The solution: LENZING CakeFil

Fully automatic filter system with consistent filtrate quality and low fluid losses.

2 yearsservice life filter cloth
4 m³/m²hThroughput per filter area

Process representation of a LENZING CakeFil installation

Filtration of sulfuric acid spinning bath

Advantages of using the LENZING CakeFil system

Cost savings

Stable filter cakes and high filter surface load enable optimum filtrate quality at high throughput rates.

System performance

Long filter cloth life cycle leads to high levels of automation and thus minimal manual intervention.

Discharge form

Effective dry discharge process minimizes liquid loss and reduces the need for complex reject treatment systems.

LENZING CakeFil

The LENZING CakeFil system is a process candle filter for cake building filtration with slurry or dry solids discharge. Its patented system enables highly efficient backwashing, thereby extending the service life of the filter fabric.

Filtration down to submicron range

Dry or slurry discharge

Efficient cake discharge

Unbeatable cloth service life

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