Abstract: A chlorine generator for preserving fruits and vegetables includes a first layer of paper, a second layer of paper and a third layer of paper. The first and second layers of paper are made of a laja type paper having a weight of about 30 to 70 gr/m.sup.2. One surface of the first layer is coated with a plastic permeable film having a weight of about 5 to 25 gr/m.sup.2. Both surfaces of the second layer are coated with a plastic permeable film having a weight of about 5 to 25 gr/m.sup.2. The third layer is made of a kraft type paper weight about 40 to 80 gr/m.sup.2. The three layers are joined together by a thermal seal. Pockets are defined by the layers and the seals. Calcium hypochlorite is placed in the pockets. The kraft paper layer can be impregnated with a mixture including about 1 part calcium hypochlorite anhydrous, about 4 parts calcium sulphate, about 8 parts toluene and about 2 parts acrylic lacquer.