Aplicación: Coat leather with coloured, protective and functional layers

In brief

Leather finishing involves applying colour and topcoat layers, protective varnishes, gloss or matting agents, and materials that provide tactile or water-repellent properties. The application should preserve the natural structure while producing a uniform appearance.

De qué se trata esta aplicación

The right solution starts with the entire process rather than an individual gun. Spray pattern, nozzle design, material pressure, delivery, component movement and cleaning must be considered together to keep the application stable and repeatable.

Purpose and benefits of the coating

The application mainly concerns natural leather, coated leather and suitable synthetic leather materials. The required effect occurs only when coating material, substrate, layer thickness and subsequent drying or curing fit together. The spraying process must therefore be adapted to the concrete material system and the real production conditions.

Alongside surface quality, material consumption, cleaning effort, system availability and reliable repeatability also matter. A sound technical solution therefore combines controlled atomisation with a stable material supply that is easy to regulate.

What matters with the application

Even small fluctuations in material pressure, viscosity, distance or movement control can change the coating visibly or functionally. Typical requirements include:

even colour on different absorbent areas
preserving flexibility and feel
fine dosage of thin topcoats
Avoiding clouds, stains and dry spraying
Adaptation to flat webs and molded leather parts
fast change of color and effect

Flexible surfaces without hardening coating

Leather is coated with colours, binders, protective varnishes, agents that modify its feel or other finishing media. The layer must modify the surface uniformly without unnecessarily affecting the required flexibility, grain or tactile properties. Natural leather also varies in absorbency and surface structure.

For moving webs or hides, spray width, overlap and transport speed are coordinated. Several thin applications can produce a more uniform result than a single thick layer.

even colour and gloss effect
Maintaining flexibility and feel
adaptation to absorbency and leather grain
low overspray for wide areas
fast color and product change

Spraying technology and material supply from Krautzberger

Krautzberger treats application and material supply as a connected system. Depending on the task, manual and automatic spray guns, suitable air and material nozzles, material pressure tanks, diaphragm pumps, pump and lifting stations, and material pressure regulators can be combined.

In automated processes, spray guns can be integrated into mounts, lifting devices, axes or robots. Material changeover valves and flushing equipment support applications with several colours or media. The specific selection depends on viscosity, solids content, application quantity, cycle time and component geometry.

For fine surface finishes, various XLINE nozzle combinations and spray patterns are available. With highly viscous, abrasive or sedimenting media, sufficiently large flow cross-sections, suitable material combinations, agitators and pressure-stable delivery become more important.

The focus is on hand and automatic spray guns, wide flat jet nozzles, pumps or material pressure vessels, material pressure controllers and material change technology with a variety of colours. The technically and economically suitable combination is selected for the specific medium, components and required production output.

Typical applications

The application is used in different industries and component groups. Typical examples are:

Automotive leather and interior
Furniture and upholstery leather
Footwear, bags and accessories
Clothing leather
Synthetic leather and technical leather surfaces
Colour, protective and haptic coatings

Process integration and automation

Leather webs can be coated in continuous production lines; shaped parts require variable spray angles or manual processing. Drying must preserve flexibility and the desired feel.

In addition, component feed, extraction or ventilation, cleaning, media change and accessibility for maintenance work must be taken into account during the system integration. This keeps the process stable not only in the pattern run, but also in everyday production.

Benefits for your production

even colour and surface effect
controlled application of thin, flexible layers
Low material consumption
fast adaptation to colours and leather qualities
Reproducible production processes
manual and automated use

Process design at the Krautzberger technical centre

Liquid media and coating materials with similar names can differ considerably in viscosity, solids content, solvent base, wetting and drying. A reliable choice of spray gun, nozzle and material supply should therefore be made using the original material and a representative component.

Original leather is used to evaluate colour shade, feel, flexibility, hiding power, drying and adhesion.

On this basis, the spray pattern, material quantity, pressure, distance, movement and cleaning sequence can be defined. The result is an application solution suited to the medium, the geometry and the intended production process.

Al centro de pruebas técnico

Find the right application solution together

Looking for a spray gun, an automatic spray gun or a complete material supply for this process? Krautzberger helps you select and design suitable spray technology, nozzle configurations, delivery and regulation.

Contact Krautzberger to discuss your medium, component, production volume and desired result. Together, we assess how the process can be implemented safely and economically.

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