Cleans anilox rollers and anilox sleeves of all resolutions, and gravure cylinders. Very good and gentle cleaning due to spraying with an effective cleaner and subsequent spraying with water (high pressure, 100 bar) while the rollers, sleeves or cylinders are rotating. The inside and front surfaces of the sleeves are sealed to prevent penetration of the washing agent. The machine can be adapted to various tasks with many available sizes and the appropriate accessories

Washing machine for gravure cylinders. The cylinders are loaded onto a pneumatic slide-in unit in front of the washing machine housing. Short spraying distances. Machine versions for different numbers of cylinders.

Explosion protection of RENZMANN solvent washing machines according to ATEX equipment directive 94/9/EC (ATEX 95)

External explosion protection

The outside of RENZMANN solvent washing machines meets the requirements of ATEX category 2; the units may therefore be operated in explosion hazard zone 1.

Internal explosion protection

When the solvent is heated to a temperature above its flash point and/or when aerosols are formed through the spraying of any solvent with a pressure of more than 0.7 bar or through the rotation of the washing brush, a potentially explosive solvent vapor-air / aerosol-air mixture is generated in the washing chambers. Consequently, the interior of such solvent washing machines is classified as zone 0 (ch. 5.6.3.3) according to EN 12921-3 "Machines for surface cleaning of industrial products using flammable cleaning liquids".

Fulfillment of the "CRITERIA FOR THE SELECTION OF EQUIPMENT AND PROTECTIVE SYSTEMS” according to the ATEX workplace directive 1999/92/EC (ATEX 137)

D.W.RENZMANN uses a certified quality assurance system according to ATEX and consistently implements all relevant legal requirements.

The operator is required by ATEX to use equipment of the correct category for the respective hazard zones, e.g. category 1 equipment for zone 0.

D.W.RENZMANN supplies category 1 washing machines with a type examination according to ATEX and thereby protects customers from any liability due to unsuitable or prohibited washing machines, irrespective of the solvent used.

Cleans printing press parts such as ink pans, ink containers, doctor blades and other parts with solvent or with alkaline water-based cleaners. During the washing operation, the parts are sprayed with solvent by spray pipes oscillating around their longitudinal axes. Very good cleaning results due to short spraying distance and a powerful washing pump. The solvent tank is separated from the washing chamber; hence emissions are considerably reduced. The machine can be adapted to various tasks with the appropriate accessories. The solvent washing machine is type-examined and explosion-proof (category 1/2) in accordance with ATEX

Highly effective and eco-friendly cleaning products for spotless surfaces

KS-Chemie, a company of the BÜFA Group, develops and markets cleaning products for the manual and automatic removal of inks, paints and varnishes. In addition to products for industrial cleaning applications, the company also produces cleaners for automatic wash processes in the graphic arts industry and in the paint and varnish industry.

The product range is characterized by its high effectiveness and efficiency, combined with ecological compatibility. The versatile product family includes water-based and waterless, low-emission products that are suitable for various ink systems.

The application range includes all major automatic and manual cleaning methods in the printing and packaging industry, e.g. for the dissolution and removal of ink and glue residues from

• printing units and components
• ink supply systems and ink containers
• rollers, cylinders, printing plates

Superior heating- and agitating- / scraping-technology guarantee the maximum in saturation contaminated water based media, causing  waste quantity reduced to minimum.

Distillation Unit type ROTOaX-W with Prevaporizer

Heating energy used twice à double output, half energy consumption per litre of evaporated water.

Process description

Approximately half of the contaminated water is evaporated in the prevaporizer under ambient pressure. The steam of 100°C containing the energy installed at the prevaporizer is supplied to the heating floor of the distillation unit.

The pre-saturated water left in the prevaporizer is extracted into distillation vessel by vacuum. Vacuum inside distillation vessel reduces the boiling range of water to < 60°C. The temperature gap of > 40° between the pre-saturated water inside distillation vessel and steam of 100°C supplied from prevaporizer ends in condensation of the steam in the heating floor of the distillation unit while heating energy is transferred to the product inside distillation vessel. The saturation is finalized inside distillation vessel and 95% of the original water quantity included in the stream to be treated is evaporated and ends in the clean water stream

The condensate left in the heating floor guided by vacuum enters the condensator and joins the steam rising up from distillation vessel. The total of distillate cools down the condensator a little while passing through to vacuum unit and draining into a clean water reservoir.

The loss of water in the prevaporizer (half-half by evaporation and by extraction into distillation vessel) is compensated by continuous refill.

recovers washing solvent and washing fluids and treats ink residues in a cylindrical distillation boiler featuring a steam-heated floor. The unit is designed for batch operation and continuous operation. High-boiling solvents can be distilled with the available vacuum technology. An agitator/scraper system rotating slowly in the boiler permanently stirs the contents, keeps the heating surfaces clean to ensure an optimum heat transfer and, at the end of distillation, automatically discharges the residue through the open discharge valve at the bottom of the boiler. With the type-examined agitator/scraper system and other safety-related details, the unit meets ATEX requirements

recovers washing solvent and washing fluids and treats ink residues in a cylindrical distillation boiler featuring a steam-heated floor. The unit is designed for batch operation and continuous operation. High-boiling solvents can be distilled with the available vacuum technology. An agitator/scraper system rotating slowly in the boiler permanently stirs the contents, keeps the heating surfaces clean to ensure an optimum heat transfer and, at the end of distillation, automatically discharges the residue through the open discharge valve at the bottom of the boiler. With the type-examined agitator/scraper system and other safety-related details, the unit meets ATEX requirements

Explosion protection of RENZMANN solvent distillation units according to ATEX equipment directive 94/9/EC (ATEX 95)

External explosion protection

The outside of RENZMANN solvent distillation units meets the requirements of ATEX category 2; the units may therefore be operated in explosion hazard zone 1.

Internal explosion protection

When solvent in a container is heated to a temperature above its flash point, a potentially explosive solvent vapor/air mixture is generated above the liquid level. That is why the inside of containers filled with flammable liquids is classified as zone 0 according to the Technical Guidelines for flammable liquids (TRbF 20 ch. 8.2.1).

While the solvent vapors in the distillation boiler displace the atmospheric oxygen during boiling, an explosive solvent vapor-air atmosphere exists frequently and persistently above the liquid level during the following operating modes:

during and after filling while the heating is off,in the heating phase,during ventilation before and during residue discharge, andwhen solvent is filled into the unit to dissolve incrustations

This means that the criteria of zone 0, a permanent or frequent presence of a potentially explosive atmosphere, are definitely fulfilled. Therefore, the interior of the distillation boiler is classified as zone 0 in Code of Practice T001 of BG-Chemie "Small distillation units for solvents" (ch. 5.5) and must meet the requirements of category 1 devices according to ATEX.

D.W.RENZMANN solvent distillation units

meet the requirements of category 1 devices on the inside and may therefore be operated with zone 0 on the inside. are equipped with electrical and moving mechanical components on the inside that are type-examined according to ATEX.

Explosion protection of the vacuum unit

The vacuum unit extracts the explosive atmosphere above the liquid in the distillation boiler until a vacuum is established, and maintains the vacuum by sucking off air that leaks into the distillation unit from outside. The vacuum pump delivers air if the vacuum must be reduced due to foaming or to prevent cavitation caused by leak air at the suction side of the vacuum pump. This means that the vacuum pump constantly aspirates explosive atmosphere at vapor/air temperatures above the flash point, and the inside of the pump must therefore be classified as zone 0.

D.W.RENZMANN uses liquid jet vacuum pumps made of metal that are grounded and have no moving parts; hence there are no potential ignition sources. Consequently, these pumps may be operated with zone 0 on the inside.The centrifugal pump that primes the jet pump is always filled with solvent, i.e. there is no explosive atmosphere on the inside; this is monitored redundantly.

RENZMANN only uses liquid ring vacuum pumps (centrifugal) for solvents with a flash point > 50°C and if the distillate is cooled down below the flash point in the condenser of the distillation unit (this is monitored). Pumps of this type do not meet the requirements of category 1 for low flash points, unless very sophisticated monitoring equipment is used and certain process parameters are observed that are impossible to comply with in the daily running of a distillation unit.

Fulfillment of the "CRITERIA FOR THE SELECTION OF EQUIPMENT AND PROTECTIVE SYSTEMS" according to the ATEX workplace directive 1999/92/EC (ATEX 137)

D.W.RENZMANN uses a certified quality assurance system according to ATEX and consistently implements all relevant legal requirements.

The operator is required by ATEX 137 to use equipment of the correct category for the respective hazard zones, e.g. category 1 equipment for zone 0.

D.W.RENZMANN supplies category 1 distillation units with a type examination according to ATEX and thereby protects customers from any liability due to unsuitable or prohibited distillation units, irrespective of the solvent used.