Walking air shower for entering the clean room.
The cosmetics company has decided to convert the workroom into a clean room. They were considering changing the entry from a simple double door to passing through an air shower from the changing room to the workroom. However, they were troubled by the lack of space to install the air shower, and even if it were installed, it would take a considerable amount of time for 200 workers to pass through, making implementation difficult. Issues: 1. Entry into the clean room (workroom) through a double door brings in sources of contamination. 2. There is not much space available for installing an air shower for a large number of people. 3. Since the number of workers exceeds 200, it takes time to enter.
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Initially, a method was proposed to arrange two-row type air showers in three rows, but it was not possible to secure the installation space. A method was proposed to install five-row air showers in an L-shape to save space. Additionally, having 200 people enter using the typical method of stopping to be blown clean would take a considerable amount of time, so a walking type was proposed where individuals can pass through the five-row air showers to become clean. During the passage, they can receive air blows from multiple directions for a total of 15 seconds without needing to stop. As a result, 200 people can pass through continuously, significantly reducing the time required for entry. However, with this method, when 200 people pass through continuously, both the entrance and exit doors of the air shower room would be open, posing a risk of the blown dust entering the workroom. Therefore, the air supply fan of the air shower was specially enlarged to increase the intake capacity. Additionally, the direction of the air blow was adjusted, and the design specifications were made to minimize turbulence, thereby minimizing the inflow of dust into the workroom.
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