Aplicación: Coat rubber-metal composite parts with adhesion promoters and protective coatings

In brief

Before vulcanisation, metal parts are often coated with primer and bonding agents to create a permanent bond between rubber and metal. Protective or lubricating coatings applied subsequently can provide additional functions.

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 steel, stainless steel, aluminium and other metals in combination with elastomers. 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 primer and adhesive film
Complete coverage of edges and small geometries
Prevention of defects, dust and contamination
Safe handling of sedimenting or reactive materials
Reproducible layer mass at large quantities
fast color or media change with different systems

Specific application of adhesive agents and functional surfaces

For rubber-metal composites, metal components are often coated with primers and adhesive agents before the elastomer material is applied or vulcanized. The adhesive surface shall be fully wetted, while threads, fits and other functional areas shall remain free.

The layer thickness and ventilation are based on the respective adhesion system. Pigmented or solid media may require stirring and wear-resistant components.

Complete wetting of the adhesive surfaces
precise masking of functional areas
even primer and cover layer
Ventilation time before further processing
clean handling without contamination

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, agitators, material pressure vessels or diaphragm pumps, material pressure controllers and for bulk coating spray technology in rotary systems. 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:

Vibration dampers and bearings
Seals and membranes
Automotive and suspension components
Rolls, bushings and coupling elements
technical rubber-metal molded parts
Mass small parts before vulcanisation

Process integration and automation

Individual parts can be coated on workpiece carriers; drum or rotary processes are suitable for large quantities. Pretreatment, intermediate flash-off and component handling must be synchronised with the spraying process.

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

Uniform adhesive layers
Stable composite quality
less scrap through reproducible application
Flexible processing of primer and deck system
suitable for single and mass parts
Matched stirring and material supply

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 parts are used to evaluate wetting, coating mass, drying and bond adhesion together with the material system.

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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