About perforation

We specialize in micro perforation

There are two types of perforation: regular perforation and micro-perforation. At Dan-How, we are specialists in micro-perforation. Through the use of our own specially developed production lines, we ensure high quality, safe handling and control of the materials. The material is passed from the coils through high-speed punching machines with associated washbasins and drying ovens before they are rolled up again.

To achieve a clean and precise perforation, we design the high-quality punching tools ourselves. Thus, you, as a customer, have your own influence on how your perforation pattern should look.

Our special production and collection methods ensure optimal quality and environmental management. Not only do we reduce the amount of waste material, but at the same time, we can send about 99% of the waste material back for recycling!

We call it “High value for money”.

Below you can read a little more about the individual steps of perforation in detail.

Micro perforation

Microperforation is Mµ-precision perforation of burr-free holes in a diameter down to Ø 0.55 mm without damaging the surface coating of the materials. This precise and detailed perforation technique makes it possible to produce architecturally advanced designs in the highest quality.


Washing and cleaning of the coil materials ensures that micro-burrs, dirt and steel dust are removed from the surface of the belt before it is rewound. This always ensures clean, neat and scratch-free material surfaces.

Tension correction

All perforation processes create tension in the materials being perforated. To prevent the surface of the material from cracking or scratching during the following rolling, cutting and bending processes, the finished perforated material is tension-corrected. This way you avoid getting material returned that does not live up to our quality standards and must therefore be discarded.

Why is microperforation the best choice?

Through the three most important production steps perforation, washing and tension direction, you are always assured to get your custom-made and perforated coils with the highest possible material and quality assurance. 

Our production line ensures a minimum of material waste, so you get as many usable material meters as possible.

Because we develop the punching tools ourselves, you as a customer have a great influence on the final design or choice of pattern for your perforation job. Through our close collaboration with customers, we ensure that we continuously develop and move our boundaries for what is possible. As a customer, you send us a perforation request and we will return with an optimized production proposal and associated offer or a production acceptance. The most important thing for us is to be able to meet your perforation desires without compromising on quality.

Nothing is impossible, but miracles have a longer delivery. 
Our customers are among all types of metal manufacturers who, among other things, work with lighting, blinds, ventilation, filters and metal ceilings and walls. Recently, perforation in plastic for the pharmaceutical industry and perforation in stainless steel for filters have been introduced.

How is perforation done?

Learn about the process

Dan-How Perforation ApS ‘perforation takes place as a continuous process in the longitudinal direction of the belt from coils in modern production lines consisting of high-speed punching machines with associated washbasins and drying ovens.

In addition, we have separate production lines for the tension correction of the materials after they have been perforated.

Watch the video to get a behind-the-scenes look.


Look behind the scenes



Metalcolor – Schweiz
For many years Metalcolor SA and Dan-How Perforation ApS have been collaborating.
For Metalcolor, Dan-How is a very reliable partner and in our opinion the best in the field.
Customers are delivered with Swiss quality pre-painted aluminium coils in an infinite range
of colours, coated by Metalcolor, with precise micro-perforation performed by Dan-How.


Servis Climax a.s. – Tjekkiet
Climax is working with Dan-How Perforation already for ages and all the time we are more
than happy to have such a reliable supplier. It is always important to have precise deliveries
in means of quality and time and Dan-How is matching those needs perfectly


Metalpaint AG - Schweiz
We appreciate your support and your collaboration with Metal Paint
and we are convinced they will be a good relationship.


HAUFE-Deckensysteme GmbH-Tyskland
Als Hersteller von Deckensystemen arbeiten wir seit gut 10 Jahren mit der Firma Dan-How eng zusammen,
die für uns die Bänder unserer Lamellendecken mikroperforiert. Um die Qualität unserer Systeme auf einem
gleichbleibenden hohen Niveau zu halten ist es für uns wichtig, dass der vereinbarte Qualitätsanspruch an
Lochung und Richtqualität verbindlich eingehalten wird. Ebenso müssen wir durch die Objektarbeit Liefertermine
verbindlich einhalten und oft auch sehr kurzfristige Lieferungen realisieren. Die Firma Dan How hat uns hier immer
voll unterstützt und stehts pünktlich die geforderte Qualität geliefert. Wir schätzen diese Zuverlässigkeit und die
immer freundliche Zusammenarbeit, auf die wir hoffentlich auch zukünftig setzen können. Herzlichen Dank
vom gesamten Team der HAUFE Deckensysteme GmbH.


Svenska Westaflex AB - Sverige
I snart 10 år har vi skickat vårt material för perforering till Dan-How Perforation, och vi är
väldigt nöjda att ha dom som leverantör. Kompetenta och väldigt trevliga. Rekommenderas starkt.

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