Laser, printing and etching processes


Possibilities of customisation options.

Gronbach has a wide range of metallic and hybrid printing processes for metal coatings and for customising appliance fronts, side panels and other components.
We integrate coloured structures even in base materials that have a completely different original colour.

Processes in manufacturing.

  • Etching process
  • Laser
  • Screen and pad printing
  • Alternative finishing methods

Supplier metal etching

The etching process enables, for example, a 3D lettering or a 3D logo made of the same alloy as the carrier material, but with a completely different look. In the subsequent anodising process, these three-dimensional designs are coated to be particularly resistant to chemical and mechanical stress. The combination of matt and shiny effects promises special aesthetics.

Supplier, company laser engraving on metal, metal laser engraving and metal engraving

The inscription of surfaces with the help of solid-state lasers is the technology used for the depiction of logos, symbols and lettering on stainless steel or aluminium. It is particularly suitable for all visual representations of operating functions and branding on the carrier material. The desired contour is achieved by ablating the material layers accordingly.

Laser marking or laser engraving is carried out on a 250 x 250 mm plane field for part sizes up to 1300 x 600 mm.

UV printing, screen printing and pad printing for metals

Using screen printing, pad printing and UV printing, a wide range of printing solutions can be realised for metals, metal foils and plastics, e.g. raised or transition-free logos, symbols and lettering for fronts, side panels and components.

The UV printing process was specially developed by us to meet the high requirements of the cross-cut and Ericson grip test and in order to guarantee long-lasting use. Likewise, we can print directly onto the base material using digital printing technology with four or six colours.

Metal refining process

Mechanical finishing

We can grind, brush, polish or blast metal surfaces to a wide variety of degrees of fineness. Turning or milling the metals is also possible. Due to the automated, robot-controlled treatment of the surfaces, every processing is 100% reproducible.
Our manufacturing technologies include

  • Brushing, grinding
  • Blasting
  • (Laser) polishing

Supplier, manufacturer chemical dyeing, chemical anodizing in Germany


We have a factory-owned anodising plant that can support you with the following finishing processes:

  • Organic or electrolytic anodisation
  • Partial / selective anodising
  • Anodising of already back-moulded components

In addition, various forms of pre- and post-treatment are possible, for example brushing, grinding, blasting, polishing, special pickling and lasering.


Supplier, manufacturer powder coated metal surfaces

Powder coating

Using our own powder coating facility, we coat components with a choice of over 210 RAL colours, which we deliver just-in-time. For special requirements, we provide the surfaces for example with anti-stick or anti-fingerprint coatings.


Your advantages.


Abrasion-, scratch-, impact- and shock-resistant surfaces.
Protection against weathering, high temperatures, UV light and corrosion.


Customisable prints and engravings.
3D designs.


Different gloss levels and metallic effects.


Permanent labelling.
Possibility of back-injection with plastics.

Download brochure (PDF)
Further services

Cross elements of metal processing.

Our printing processes form one component of our entire service portfolio.
In addition, we fulfil the entire service supply chain – from toolmaking and metalworking to back injection with plastics and back injection moulding with plastics to final assembly and logistics – all from a single source.

  • Component manufacturing
  • 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 metal processing

Aluminium, sheet metal, stainless steel and steel:

  • Bending and forming
  • Turning (CNC), milling (CNC), sawing
  • Presses with up to 500 t clamping force
  • Punching (with or without foil)
  • 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

We manufacture a wide range of different products, including fan wheels and components as part of assemblies, in our own plastic injection moulding shop with machines up to 300 t clamping force.
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 person for design 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.