1. Dust emission

The amount of dust generated in the clean workbench can be considered to be discharged through local ventilation from the equipment, without flowing into the room; The amount of dust generated by products, materials, and other materials during transportation is generally very small and negligible compared to the amount of dust generated by the human body; Due to the application of metal half walls (color steel sandwich panels), there is also very little dust generated from the building surface, generally accounting for less than 10%, and the dust mainly comes from people, accounting for about 90%. In terms of human hair dust, due to improvements in clothing materials and styles, the absolute amount of hair dust is also continuously decreasing.

A. Material: Cotton has the highest dust emission, followed by cotton, dacron, pure polyester for electrostatic removal, and nylon.

B. Style: The large hanging type has the highest dust generation, followed by the upper and lower split type, and the full cover type has the least.

C. Activity: The amount of dust generated during movement generally reaches 3-7 times the stationary time.

D. Cleaning: The amount of dust generated by washing with solvent is reduced to one-fifth of that of washing with regular water.

The amount of dust generated on the surface of indoor maintenance structures, based on the ground, corresponds to approximately 8 square meters of surface dust generated by a stationary person.

2. Microbial quantity

Pollution caused by staff:

1) Skin: Humans typically complete a complete skin replacement every four days, with approximately 1000 pieces of skin shed per minute (average size 30 * 60 * 3 microns)

2) Hair: Human hair (approximately 50-100 microns in diameter) has been shedding.

3) Drool: includes sodium, enzymes, salt, potassium, chloride, and food particles.

4) Daily clothing: particles, fibers, silica, cellulose, various chemicals, and bacteria.

5) Human immobility and sitting will produce 10000 particles greater than 0.3 micrometers per minute.

6) Humans produce 1000000 particles larger than 0.3 micrometers per minute during head and torso movements.

7) When humans walk at a speed of 0.9m/s, they produce 5000000 particles greater than 0.3 micrometers per minute. Analyzing foreign experimental data, it can be concluded that:

When staff wear sterile clothing in a clean workbench:

The bacterial count at rest is generally 10-300 per minute per person

The bacterial count during general physical activity ranges from 150 to 1000 per minute per person

The bacterial count during brisk walking ranges from 900 to 2500 per minute per person

(2) A cough usually lasts for 70-700 pieces per minute per person

A sneeze usually takes 4000-62000 per minute per person

(3) When wearing ordinary clothes, the bacterial count is 3300-62000 per minute per person

(4) Fungal count without masks: Fungal count with masks 1:7-1:14

(5) Microbial count: Dust count 1:500~1:1000 According to domestic examples:

During the surgery, the number of bacteria in the personnel was 878 per minute per person

So, it can be seen that the static bacterial count of sterile clothing personnel in the clean workbench generally does not exceed 300 per minute per person, while the dynamic bacterial count