Bellow steps


  • laser-cutter
  • beaker
  • vinyl gloves
  • scissors
  • hollow punch (5mm)
  • tape
  • rubber roll
  • rubber spatula
  • brush (for latex)
  • brush (for talcum)
  • 2 C-clamps


  • black cardboard (48cm x 95cm, 350g/m2)
  • self-adhesive mirror film (48cm x 95cm)
  • self-adhesive transfer film (50cm x 100cm)
  • moscito net (50cm x 100cm)
  • liquid latex (1 liter, thick)
  • strip of latex-textile (4cm x 95cm)
  • strip of transparent adhesive film (4cm x 95cm)
  • metal sheet (168mm x 102mm x 2mm)
  • Weicon adhesive spray
  • Pattex transparent
  • epoxy glue
  • some white paper
  • talcum


tools and some of the materials

End Result

folded bellow with metal frames

Laser-cutting and metal frames production.

Before laser-cutting, glue the mirror film to the cardboard.

Load the provided file to your laser-cutter and try cut settings with a test piece of the material. Then, cut the sheet. As material we used woodfree cardboard from Igepa (Art.-No. 354-97).

Further we got the metal frames professionally produced. All its holes need a M3 female screw threading.

Coating preparation

You will need an assistant for the following steps.

Cut transfer adhesive film to about 50cm x 100cm and remove its protective sheet starting at one corner, pulling diagonally and almost parallel to the surface.

While one person positions the transparent film parallel to the end of the cut cardboard (mirrored side up!), the other holds up the other end.

The film should protrude the cardboard on every side.

cut transfer adhesive film to 50cm x 100cm

removing film from paper, start at one corner and pull diagonal and parallel to surface

While one person positions the transparent film parallel to the end of the cut cardboard (mirrored side up!), the other holds up the other end. The film should protrude the cardboard on every side.

Starting at one corner, wipe-press a cloth over the foil to stick it to the cardboard. While brushing from left to right, move slowly from one end of the cardboard to the other.

transparent film properly mounted on sheet

cut mosquito netting to 50 x 100cm

apply adhesive spray to cardboard

apply adhesive spray to mosquito net

Wait 10 minutes before mounting mosquito net on cardboard, adhesive spray needs to be dry

Mount mosquito net to the cardboard in the same way as you applied the transparent adhesive film before. Adjust its position by hand if necessary. Avoid wrinkles!

Use a rubber roll to evenly apply pressure. Not the time but the amount of pressure determines the quality of the connection.


Put on vinyl gloves, and repeat coating three times. Thin layers of latex are better, wait for one layer to fully dry until you apply the next layer. This takes more or less 2 hours.

tape material to working surface, it should be strapped with a proper amount of tension

Pour more or less 300m of liquid latex on material

spread liquid latex on surface evenly

the more diagonal you hold the rubber spreader the easier you can spread the latex into the mosquito net

take care of the edges, they should be fully covered by latex.

coated material, avoid dabs, if they happen spread them with your fingertip

Preparing putting

detach material from surface and cut along the edges

here as shown on the sides

here as shown on the bottom part

cut away excess material.

cut wholes with hollow puncher.

Remove adhesive transfer film from the mirror side of the material. it is very important to remove it by pulling slowly, parallel and close to the surface. that way you won’t rip latex out of the spacings in between the material


For the following steps it is much easier to work with somebody who can give you hand.

put a log of wood in the middle of coated sheet as supporting structure during the putting process

put the strip of adhesive film on the log (adhesive side up) and fix it with tape at each end of the log

bend one half of the sheet towards the adhesive foil on the log so that it sticks there

bend the other half

start at one end putting both ends together

slowly moving up, triangles need to interlock

cut strip of latex textile 4cm x 95cm

apply a 4 cm wide strip contact glue to the bellow’s seam.

apply contact glue on latex textile strip

When the glue has fully dried glue strip to seam by applying pressure with rubber roll.

bellow with proper applied strip

Apply latex with brush along the edges of the strip

spreading latex with fingertips


cut the edges of the short ribs at each side of the bellow

apply talcum evenly on surface

Fold bellow

Completely folded bellow

Clamp the bellow over night so it will stay in folded position. It it not necessary to apply a lot of pressure. Just that it is stable.


While glueing in the metal frames at each end of the bellow work with another person. before glueing make sure metal parts are fat and dust free. Glue one frame at a time since the epoxy hardens quiet fast!

Put metal frame inside the last fold of the bellow, make sure that the holes are in the same positions as in the bellow and apply a thin layer of epoxy in between the holes. Leave 1 cm space between holes and epoxy to make sure that no glue will go into the female screw thread.

Fold the end of the bellow around the metal.

take care that holes of metal frames and below are aligned.

Clamp bellow, not to apply a lot of pressure, rather to stabilise the last foldings of the bellow

let it sit until epoxy is hardened

apply latex on the naked metal edges at each end of the bellow