Experience, expertise and a clear focus onprocess enhancement have resulted in thedevelopment of our innovative Venturi dryingsystems for film casting applications.
ipco.com----VENTURI---DRYING-------SYSTEM---FOR--------------CONTINUOUS---------FILM---CASTING

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----- innovativE dryinG
SyStEm For HiGH QUaLity
FiLm caStinG
Ongoing investment in R&D, coupled with our proven experienceand expertise in process technologies for the production of film
materials, has resulted in the successful development of an
innovative Venturi drying system for film casting applications.

The production line begins with a slot die thatapplies an accurately controlled layer of liquid
product onto a polished steel belt. From here it
passes through the Venturi dryer where thesolvent – aqueous or organic – is evaporated
quickly, efficiently and in a manner that leaves
the end product almost completely free oftension both laterally and longitudinally.
This high precision system dramatically improves
the casting process, enabling the productionof film products to exceptionally narrow
tolerances without any risk of skin formation,and eliminating costly faults and imperfectionsin the final material. The inherent benefits ofthis indirect drying solution also result in a highdegree of energy efficiency.
While the IPCO film casting system offers anumber of unique market benefits, the compact

Venturi dryer can also be used in conjunction
with other drying technologies including
traditional impingement dryers.
Excellent thermal and air flow effects
The key benefits of the IPCO Venturi dryer areachieved through the use of a permeable metal
foam above the drying film. A flow of tempered
air is applied to the upper side of this foamlike metallic material, creating a low negative
pressure effect on the lower side in accordancewith the standard laws of pneumatics.

As a result, a constant and even suction flow
is formed, delivering a homogeneous drying
effect. This minimizes thermally-induced
shrinkage and eliminates the risk of structuraldefects in the surface and layer structure ofthe film.

Airflow over permeable metallic board
creates low negative pressure effect forhomogeneous drying.

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Improved product quality, reduced
drying times
The introduction of the IPCO Venturi dryer
enables manufacturers to achieve significant
improvements in product quality andreproducibility while also enhancing production
efficiency. The increase in thermal transfer
efficiency compared with conventional dryer
systems also enables a reduction in the lengthof the drying section.

Typical film casting applications include:
Filter membrane (nitrocellulose)• Applications: filters for pharmaceuticaland food applications.
• Film thickness: 40–100 μm.
Ceramic tape (polymer resins)• Applications: semiconductors, fuel cells,solar cells.
• Film thickness: 200–300 μm.

3IPCO Venturi dryer
Steel belt-based film casting
Our film casting system delivers a homogeneous
layer of liquid product onto a polished steel beltwith outstanding consistency of thickness. The
cast layer is then transported on the polishedsteel belt through the Venturi drying unit toachieve a stable, high quality product in an
extremely efficient manner.

As well as the direct casting system shown
below, the unit is also suitable for use on
fixed casting tables:• Efficient continuous production.
• Film thickness / flatness to fine tolerances.
• Low stress in the formed film.
• Elimination of faults and imperfections.

Metal foam

Steel belt
Saturated air

Wet film

Edible films (soluble polymers)• Applications: pharmaceutical capsules, pills.
• Film thickness: 40–50 μm.
Optical films (tac)• Applications: LCD top film.
• Film thickness: 30–200 μm.

Metal foamSlot dieClean airSolvent recovery unit

Venturi dryer

Battery film (li-ion)• Applications: Battery electrodes.
• Film thickness: 10–50 μm.
A solution based on market leading
technologies
The IPCO Venturi dryer has been developedin partnership with institutes specializingin coating and film casting technology.
We have also worked in close cooperation
with TSE TROLLER, manufacturer of diesfor pre-metered coating.
Key benefits of the IPCO Venturi dryer• Prevention of skin formation.
• Thickness profile to precise tolerances.
• Formation of a homogeneous laminar flow.
• Elimination of faults and imperfections.
• Two-dimensional homogeneous drying
profile.
• Minimized thermally-induced shrinkage.
• Significant increase in product quality.
• Significant increase in heat transferperformance.
• Significant reduction in drying section length.

4WinderSteel belt unit

The IPCO Venturi dryer unit optimizes theevaporation process of the solvents in thecasting solution. It enables the productionof very thin films of the highest quality,
preventing skin formation and eliminating
costly faults and imperfections.

IPCO can design and manufacture completelines for the production of various types offilm and membrane products.

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Venturi Dryer

Product feeding

Belt heatin

Unwinder6

Steel belt unTest your products on our pilot plant
Our innovative dryer technology supports a range of potential
casting applications and will also deliver significant benefits
when used in conjunction with other drying technologies.

The development of the IPCO Venturi dryer
represents a major step forward in drying
technology and we invite you to put it to thetest on your own products. We have a film
casting system available for process assessment

and product testing at our Productivity Centernear Stuttgart, Germany, and our techniciansand engineers are available to provide full
support in terms of mapping the process inbatch mode.

Impingement dryerngnit

Film take-offWinder7804-2020-----VENTURI---DRYING------SYSTEM---FOR------------CONTINUOUS-----------FILM---CASTING-----