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Additive manufacturing for industry

Additive manufacturing for industry

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Finishing

We can carry out optimization in accordance with your specifications.

In principle, all components, prototypes, and functional models made at Murtfeldt are ready for use. However, thanks to the facilities available at our Dortmund location, diverse finishing and further processing techniques can be used after the actual printing process in order to further optimize the result in accordance with your requirements.

The finishing of printed components or prototypes can be included in the production process in an on-the-fly manner if required.

>> Our finishing options can be found here.

 


 

Finishing options

Vibratory grinding

In this finishing procedure, the surface of the component is machined so that it no longer feels raw and porous. Together with abrasives (made from ceramics or plastic), the components are placed into a tub and are polished by relative movements. The surface of the components, the residual roughness, and the material abrasion can vary greatly depending on the duration of the process. This finishing technique can be effectively combined with dyeing and infiltrating.

Glass bead blasting

In general, SLS components are blasted with glass beads to remove excess powder. Internal ducts are cleaned with compressed air.

Ceramic blasting / Shot peening

Components that require an improved surface density are blasted with ceramic beads. The aim is to compress - and thus strengthen – the component surface. Because this can result in discolouration, these components are then dyed in a subsequent process.

Dyeing

Because SLS components are always the colour of the material and the surface is slightly rough due to the SLS process, we always recommend the dyeing of these components. This is because dirt quickly accumulates due to the surface roughness. The component then looks grubby. When components are dip-dyed, dye penetrates the component to a depth of 0.3 mm. This eliminates additional material deposit and the properties of the component are retained. A wide range of colours are available (but not RAL colours). Dyeing is easily combined with the finishing techniques of vibratory grinding and infiltration.

Filling / Painting

Painting is suitable for components that need to have a particularly high-quality appearance (for example, fair exhibits). As the first step, the SLS part is filler-coated, smoothed down and cleaned. Next, the component is painted in the chosen colour (RAL colour) and dried. The choice of paint depends on the usage of the component. Depending on requirements, there are diverse possibilities such as matt, gloss, or textured. Special paints can also be applied, e.g. ESD paint for electrostatic protection.

Chemical / Thermal Smoothing

The smoothing process that we developed ourselves allows us to smooth SLS components so that they are 100% water-resistant and dirt-repellent. The components are chemically/thermally sealed in an immersion bath - without additional material deposit. After this process, our components receive the Murtfeldt rating „[FS] Food Safe“. This attests to compliance with legal requirements for the food industry as follows here*.

Infiltration

Infiltration impregnates and seals the surface of the component. During the process, a colourless epoxy resin is applied to the SLS component. This can ensure an air-tight and water-tight seal even in humid atmospheres and at high temperatures. Infiltration can be effectively combined with dyeing.

Printing

Infiltration impregnates and seals the surface of the component. During the process, a colourless epoxy resin is applied to the SLS component. This can ensure an air-tight and water-tight seal even in humid atmospheres and at high temperatures. Infiltration can be effectively combined with dyeing.

Laser Printing

This procedure involves labelling and marking components with the help of an intensive laser beam. Unlike UV LED printing, the plastic that is printed on changes in itself. Labelling printed on using a laser is smear-resistant and extremely durable. The 
addition of really small, machine-readable labels (e. g. QR code, Data Matrix code) directly to the product is also possible.

Rubberizing

A further finishing type is rubberizing. This type of finishing is recommended for components that are not allowed to bring about slide or slipping processes and for high-quality parts that should not leave behind impressions. This coating also protects components from minor knocks and provides support for gripping, retaining, and tensioning. Flexible elastic coatings encircle the contour of the part upon contact, disperse the contact pressure, and reduce point loads.

Assembly

Most customers gladly use our assembly services. Here, we assemble and finish complete components or even assemblies for you. The parts are then packaged individually or as a group and sent directly to you or shipped on your behalf as desired.

Machining Finishing

Processes such as drilling, turning, milling, grinding, and thread cutting can improve the precision and quality of your component. In particular for parts where precise fit sizes need to be observed, mechanical finishing really is recommended.

PUR Coating

Components that should not cause any slide and slipping processes or leave behind impressions can benefit from a PUR (Polyurethane) coating. This also protects against knocks and provides support for gripping, retaining, and tensioning. We offer different surfaces and Shore hardnesses.

Flock Coating

Flock coating involves applying individual fibres to components to create a soft surface. This can prevent parts from damage and optimize their slide properties. In addition to different flock fibre lengths, different colour variants can easily be provided.

 


 

*Chemical / thermal smoothing [FS]: This attests to compliance with legal requirements for the food industry as follows:

  • Compliance with requirements of Regulation (EU) No. 10/2011 in the amended version up to and including Regulation (EU) No. 2016/1416.
  • Compliance with requirements of Regulation (EC) No. 1935/2004 and its amendments on materials and articles intended to come into contact with food.
  • Production as per Regulation (EC) No. 2023/2006 on good practices for materials and articles intended to come into contact with food (GMP).
  • Full migration and specific migration tested in accordance with Regulation (EU) No. 10/2011. Suitable for repeat contact with all types of food at application temperatures between 5°C and 70°C and contact times of up to 5 minutes.