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First, make a frame. Use thin wooden boards (eg. 2cm wide) to create two wooden frames, where the inside is the same size as a postcard. Cut some stainless steel mesh (50-100 mesh) to a size slightly larger than the frames. Then bend over about 5mm on all four sides, and sandwich it between the two frames.
Next, produce the pulp. Wash the beverage carton well in cold water. Then cut it open into a single sheet, remove the overlapping parts at the bottom and sides, and cut it into strips about 1-2cm wide.
Washing powder makes it easier to peel off the laminated polyethylene (PE) layer! Dissolve some washing powder in hot water in the bucket (make quite a thick solution). Soak the strips of carton in this for around two days and nights.
Take the pieces of carton out, and rinse the washing powder off thoroughly. Carefully peel off the thin PE layer laminated onto the carton. There are some types of carton where it is easy to peel off the PE layer, and others where it is more difficult.
Now the carton is just pulp, so rub it thoroughly and tear it into little pieces. Put the pulp from 3-4 strips of carton into a mixer and switch it on for around a minute, to produce a mushy pulp liquid.
Pour the pulp into a sieve. If it looks as though there are still some solid pieces of pulp left, slightly increase the time you use the mixer. If you don't plan on making the paper immediately, you can put this into storage! Firmly squeeze out this mushy pulp, wrap it in clingfilm and stor it in the refrigerator. When you're ready to make the paper, mix the pulp again at low speed. Pieces of pulp which haven't been through the mixer should be dried in the sun then stored. When you come to make the paper, soak them well before putting them in the mixer.
Right, lets make some paper! Fill the sealable container to about 2/3 full with cold water. Next to it lay out a piece of cotton, and the frames. Add some pulp to the sealable container - approximately 1 part to every 20 parts of water.
Stir the pulp in the sealable container around well. Sandwich the mesh between the top and bottom frames, hold them firmly with both hands and insert them gently into the water, at an angle. It's easy for the pulp to sink to the ottom, so remember to stir the water now and then! The pulp you scoop up will be a bit like soft cheese!
Rock the frames back and forth so that the pulp is evenly distributed. Repeat steps 8 and 9 a few times so that the thickness of the pulp you have scooped up grows to around 5mm.
Once you have scooped up the pulp, let the water drain off and take off the top frame. If there is any pulp stuck to the edge of the frame, it will be quite awkward to take it off. In such cases insert a spatula between the frame and the pulp to hold it down lightly, and it should become easier.
If you touch the pulp or treat it roughly, you'll distort its shape! Gently place the mesh on the board covered in cotton, so that the pulp ends up underneath.
Place a towel on top of the mesh and hold it down lightly with a heavy lid or board, so that it absorbs the moisture. Remnove the towel, place another piece of cotton on top of the pulp, and hold it down again. Place a board on top of the cotton, and rest your weight on it for 2-3 minutes to remove all the moisture.
Stick the pulp, still sandwiched between the cotton sheets, directly onto a glass plate, and let it dry there until about 90% of the moisture has gone. Keeping it sandwiched inside the cotton, sandwich it between a further two boards and rest some books or other heavy objects on top, to ensure it becomes completely dry. Finally, remove the cotton carefully. It's ready!

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