Smart surfaces


Sensitive metal surfaces.

In the field of smart metal surfaces, we combine innovative technology with excellent aesthetics. Smart metal surfaces have sensors and feedback elements to enable interactive functions and feedback in the application.

Both capacitive touch operation and operation via strain gauge replace the classic resistive operation via manual pressure on a switch or button.
We use both technologies on surfaces made of brushed, ground, anodised or polished aluminium, thus enabling the fusion of haptically “non-tangible” touch technology and optical design, e.g. for icons, lettering and logos. Both processes detect touches on the metal surface and pass them on as information to the integrated controller. They are particularly suitable for premium products as well as for hygiene-sensitive areas, e.g. in the medical technology environment.

  • Customisation
  • Fields of application
  • Application sectors
  • Wide range of finishing options
  • Optional feedback to the operator via integrated light or audio signals
  • Possibility of integrating backlit LEDs
  • Switching elements can be imprinted by laser, screen or pad printing
  • Straight or curved components possible
  • Possibility of integration in metals up to approx. 1.2 mm thickness
Fields of application
  • Fronts and panels, e.g. of household and gastronomy appliances
  • Medical control elements
  • Housings
  • Operating elements in public transport
Application sectors
  • Household appliance industry
  • Gastronomic appliances
  • Cosumer Goods
  • Medical devices with high demands on gaps-free cleanliness
Supplier capacitive metal surfaces aluminum and stainless steel
Optical fields of application

Smart surfaces in
different designs and colors.


Forms of pre- and

Surface finishing
  • Without pre-treatment
  • Brushing
  • Grinding
  • Brushing and grinding
  • Blasting
  • Polishing
  • Etching technologies
  • Screen and pad printing
  • Laser engraving
  • Laser marking



The processes of organic and electrolytic anodisation are suitable for the colour design of the metal surfaces.
We use both processes in our in-house anodising plant.

In organic anodising, the individual colour molecules are deposited in the upper areas of the pores and thus form a permanent bond with the oxide layer. By concentrating the dyes, these inclusions can be strengthened.

The process of electrolytic dyeing is carried out with coloured metal salts and by means of alternating voltage. In this process, the metal ions penetrate deep into the pores of the aluminium layer. The intensity of the colour can be regulated by the duration of the electrolysis process.

Choice of colours (organic):

  • Aluminium-nature
  • Stainless steel look
  • Bronze
  • Anthracite
  • Black
  • Additional bath for individual colour

Choice of colours (electrolytic):

  • Medium bronze
  • Anthracite
  • Black

Further services

Elements of metal processing.

  • Mechanical processing
  • Hybrid composites & bonding
  • Injection moulding
  • Toolmaking & assembly

Supplier sheet metal parts and formed parts from sheet metal, e.g. front panels for household appliances

Mechanical metalworking
from medium to large series

Aluminium, sheet metal, stainless steel and steel:

  • Bending and forming
  • Turning (CNC), milling (CNC), sawing
  • Punching and pressing with up to 500 t
  • Grinding and polishing
  • Welding

Manufacturer of metal and plastic components joined together via back molding

Back-injection of metal and metal foils

For the required substructure of metal components and metal foils, we back-inject them with the required plastics.
We design and manufacture the plastic injection moulding tools required for this ourselves in order to avoid distortion due to shrinkage and different linear expansions. Furthermore, we integrate the desired electronics or lighting elements during back injection moulding.


Joining and bonding technologies

We join components using a wide variety of methods. In bonding, we use liquid adhesives, adhesive tapes and also adhesive die-cuts, which we apply manually or robotically. Optionally, different types of pre-treatment are possible, including plasma, primer, scarfing or pyrosil as well as different rapid curing methods (UV light, infrared, heat radiation).

  • 1C adhesives with manual and robot-assisted application
  • 2C adhesives in robot systems with high-end dispensing technology
  • Adhesive tapes with manual or robot-assisted application
  • Punched adhesive substrates with special systems for perfect positioning and pressing

Back molding plastic aluminum, stainless steel, steel and metal foil

Plastic injection moulding

Via our own plastic injection moulding shop with machines of up to 300 t clamping force, we manufacture a variety of different products, including fan wheels for the appliance and ventilation industry as well as components for assemblies.
We manufacture the corresponding moulds and injection moulding tools ourselves.


Supplier toolmaking, toolmaker Bavaria

  • Embossing tools
  • Punching tools
  • Multi-cavity tools
  • Progressive dies
  • Injection moulds
  • Transfer tools
  • Forming tools for visible components
  • Devices for handling
  • Testing and measuring devices


Assembly and automation
  • Manual assembly
  • Partially automated assembly of small to medium quantities
  • Fully automated production of large quantities
  • Complete assembly lines incl. safety and function tests
  • Customised assembly lines


Your contact
for smart surfaces.

Sales Management

Daniel Wolf


+49 8071 9150


Wilhelm Gronbach GmbH
Division Ventilation & Surfaces

Am Burgfrieden 2
D-83512 Wasserburg/Inn


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      • Order volumes
      • [
      • Requests from private individuals
      Order volumes

      Please take into account that our production is geared towards medium to large series production. We are therefore unable to process requests for very small quantities for economic reasons.

      Requests from private individuals

      We ask for your understanding that we cannot consider requests from private individuals of any kind.