Temperature, humidity and cleanliness factors:
Temperature, humidity and cleanliness are the workshop environment standard data tailored for industrial products. They are the highest design basis of purification workshop and the important guarantee of product qualification rate and stability. The
current standards are divided into national standards, local standards, industry standards and enterprise internal standards. For example, the cleanliness level classification standard and GMP standard of pharmaceutical industry are national standards.
For most manufacturing industries, the standards of purification workshop of each production process are mainly determined according to their own product characteristics. For example, the temperature and humidity of exposure, dry film and resistance welding
areas in PCB industry are 22 ± 1 ℃ and 55 ± 5%, and the cleanliness ranges from 1000 to 100000; the lithium battery industry pays more attention to low humidity control, generally the relative humidity is below 20%, and some fairly strict liquid injection
workshops need to be controlled at about 1% relative humidity.
Defining the environmental data standard of the purification workshop is the most important center point affecting the project investment. The establishment of cleanliness level affects
the decoration cost: it is set at the level of 100000 or above, which requires necessary clean board enclosure, purification of doors and windows, personnel and goods air shower transmission facilities, and even expensive high price floor; at the same
time, it also affects the air conditioning cost: the higher the cleanliness is, the greater the air exchange frequency of the air conditioner necessary for full purification is, the greater the air volume of the purification air cabinet is, and the air
and water are needed The amount of tube and end high-efficiency tuyere also increases. Similarly, the establishment of temperature and humidity in the workshop not only has the above-mentioned cost problems, but also has the control accuracy factor. The
higher the accuracy, the more complete the necessary supporting equipment. If the relative humidity range is accurate to ± 3%, ± 5%, the humidification equipment and dehumidification equipment to be designed shall be complete.
of workshop temperature, humidity and cleanliness not only affects the initial investment, but also plays an important role in the operation cost of a plant with a long history. Therefore, according to the characteristics of its own production products,
in combination with national standards, industry standards and internal standards of the enterprise, it is the most basic and fundamental step to reasonably establish environmental data standards that meet its own needs.
3. Other influencing factors:
In addition to the space and environment requirements, some factors affecting the standard of purification workshop are often ignored by the designer or the builder, resulting in excessive temperature and humidity. For example, the external climate
is not considered comprehensively, the exhaust volume of the equipment is not considered, the heat generation of the equipment is not considered, the dust production of the equipment is not considered, a large number of personnel working at the same time
is not considered, and so on.
To sum up, how much is the difference between level 10000 and level 100000? Before asking this question, the most reasonable way is to make clear the parameters of the production equipment in the purification workshop
(length, width, height, exhaust volume, heat output and dust production), formulate the workshop area, floor height, temperature, humidity and cleanliness requirements to meet their own needs, and then submit to the designer to design a reasonable comprehensive
purification scheme. As the preparation party, it not only fully understands its own needs, but also runs through the quality, cost and schedule control of the design, procurement, construction, acceptance and trial production of the whole project based
on this principle, which is just right.