Nonwovens made of polyethylene are produced using a special evaporation spunbonding process. In this process PE-HD is mixed with a solvent and heated to high temperatures under high pressure in an autoclave. The solution mixture is then passed through nozzles under extremely precise control and is expanded in an explosive reaction. The solvent evaporates in the process and a three-dimensional network of thin, fibrillated filaments in strand form is deposited by a special depositing device onto a depositing belt, which also serves as a conveyor belt. This produces an isotropic fibre arrangement, which has a positive effect on the tear resistance. A minimum length of the fibrillated filaments of approx. 120 mm also contributes to increased strength values. The fibre layers are consolidated by heat and pressure using calendars of various types. This is followed by further treatments such as an antistatic finish or a printing pre-treatment by corona radiation.
Filtration Group Industrial’s customer is a global innovation leader in technology-based materials, ingredients and solutions that are transforming industry and everyday life. During the production of nonwovens made of polyethylene, dusts and fibers are generated during the production process, which must be separated from the existing gas atmosphere. The dusts that occur are very light and fine and have a fiber content, which results in high filtration requirements. Since the gas present is extremely explosive in combination with oxygen, it must be ensured that no air is introduced into the system.
Special features
The painted filter housing with a diameter of 2.4 meters, a height of approximately 5 meters and a total weight of 6.2 tons is the largest dust collector ever delivered by Filtration Group.
Due to the special application, the filter elements can only be cleaned with nitrogen.
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