How the Coil To Window System Works: Assembling Curtains Without Plastic Clips

May 2024 Rollforming

The Coil To Window technologies with plastic clip applications are now well-established technologies.

These machines start with an aluminum coil, which is formed to create the shutter and filled with the two components of polyurethane, Polyol and Isocyanate.

After the polymerization tables, which allow the foam to cure, the profiles enter the end processing system, consisting of two mobile punching and cutting carriages.

The first carriage performs a special notching of the profiles, and the second cuts them to size with a high-speed saw to create a perfect cut.

At this point, the profiles are transferred by a conveyor to the punching unit.

Thanks to the position of the punching unit, located after the profile cut, we achieve two great results.

We can choose not to drill the five profiles positioned at the top of the curtain, and we can also have curtains punched with all the holes aligned!

This is not possible when working with bars!

The profile is then transported to the threading table, where the bars are automatically threaded one inside the other to form the curtain and locked with a slight bending of the lower edges on both sides of the profile.

The notched part remains hidden in the shutter guides, ensuring the appearance and quality of the curtain are perfect.

telo plastc clips free

Another great advantage is that this production system does not require the addition of any plastic clips: so you will have the same high-quality curtain but with a lower total cost.

The profile locking is extremely robust, and the rotation is as quiet as in a curtain assembled with traditional plastic clips.

This assembly method is an exclusive Dallan feature, available for speeds up to 37 meters per minute (Dallan D6TL) and 55 meters per minute (Dallan D610TL).

In the video below, you can see this system in action!


How a Coil To Window System Works: Assembling with Plastic Clips

The Coil To Window system with curtain locking using plastic clips is very similar to the previous one.

It always starts from the aluminum coil, which is heated to temperature. During the formation, it is filled with polyurethane foam, which cures in the polymerization tables.

At this point, the profile, still without ventilation holes, is cut to size by a high-speed circular saw to achieve a perfect cut.

The profiles, already at the correct size, are transferred to the punching machine, which makes the holes according to the program: the first bars at the top of the curtain are generally not drilled, while all the others have aligned holes.

As soon as they leave the punching machine, the profiles are inserted one into the other by the threading table. The curtain is then formed inside the clip application system, consisting of two conveyor belts.

On the lower belt, the curtain is formed and then flipped onto the upper belt for clip application. On the upper side of the machine, there are two heads that perform the clip application and automatically position themselves at the correct distance.

The operator, in addition to controlling the process, helps insert the curtain into the first clip application and winding station and starts the process, which then proceeds automatically.

telo plastic clips telo plastic clips

The clips are inserted every two profiles and, with their special shape, prevent the profiles from slipping on each other: once inserted, the plastic clips are locked with staples or mechanical deformation. This area will then be hidden inside the shutter guides.

In this case, too, only one operator is needed to oversee the entire process and perform quality control of the curtain!

Often, in this last phase, the end blade in extruded aluminum is also inserted.

The assembly lines with plastic clip application are available at speeds up to 37 meters per minute (Dallan D6T) and up to 60 meters per minute (Dallan D610T).

In the video below, you can see this system in action!


Contact our experts to learn more!



Andrea Dallan
CEO – Dallan Spa

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