，大功率控制電動機 / 電動器。節省電耗能源。一般可採用溫度或濕度或壓力，為感知條件，傳入到控制器
& ISO 14644
Purpose of Clean Room Technology (English only)
Purpose of Clean Room Technology
Numerous operations in research, industry and medicine require an extremely clean environment in terms of dust and micro-organisms for their accomplishment.
The liberation of the finest particles by working processes and people is so intensive, that conventional air conditioning engineering, even with the most efficient filters, cannot guarantee the required air purities.
Clean room technology came into being to close this market gap.
The purpose of clean room technology is to supply to workplaces, -air cleaned as extensively as possible of dust and micro-organisms, and to maintain the desired state of controlled air purity there – for the good of the working man and the quality assurance of the products.
Clean Room and Their Quality Gradation
Clean rooms are defined area in which the particle concentration in the room is kept under control by suitable measures.
Internationally recognized standards – the US Federal Standard 209b and the German guideline VDI 2083 – with their field-proven findings, provide a precise basis for planning, construction and operation of clean room installations. Within these standards, purity grades for identifying the quality of clean room systems are defined which prescribe limiting values for the particle concentration in the room during its normal use.
Supplementary rules exist for specific fields of applications, as for example the guidelines concerning the requirements of biological air purity in hospitals. To fulfill the requirements made by clean room technology of air purity, filtration and aerodynamic measures are necessary.
Clean Room Grade
Max. Permitted Dust Level
US Fed. Std.
Particles per X³ Air
Division into clean room grades according to German and American determination (
not evaluated for statistical reasons).
Even the finest suspended particles (0.3 to 1µm) have a disturbing effect on numerous working and manufacturing processes.
In order to be able to meet the required air purities, HEPA (High Efficiency Particulate Air) filters of the highest quality are necessary. Such filters are distinguished by a minimum degree of separation of 99.97% measured with a paraffin oil spray with particle diameter of 0.3-0.5µm. The quality of the filter installation must be proven by a leak test after installation.
As manufacturers of HEPA filters for many years, Luwa takes its place among the pioneers of clean room filter technology with many years of experience.
Turbulent Mixed Flow and Laminar Flow
In order to be able to ensure the required air purity not only in the supply air, but also at the work-place to be protected. There are two principles of air distribution:
• the turbulent mixed flow, by which the filtered supply air entering the room, is almost ideally mixed, by induction,
with the room air: this results in the air impurities liberated in the room to be diluted.
• the low-turbulence displacement flow or laminar flow, by which the air moves on parallel streamlines at uniform
speed: the liberated impurities are directly transported out of the room.
The requirements of the purity grades 5 and 6 (resp. 10.000 and 100.000) can generally be met with the aid of the turbulent mixed flow. On the other hand, the extreme demands of air purity of grades 3 and 4 (resp. 100 and 1000) require the application of low-turbulence displacement or laminar flow.
The broad spectrum of demands on clean room systems leas to a great diversity of possible solutions. From the wide range of possibilities, the best concept must be individually worked out for each application. For this purpose, Luwa specialists do not only make their clean room expertise available, but also the required knowledge of application technology supported by many years’ experience.
Conventional Clean Room
Clean rooms of grades 5 and 6 (resp. 10.000 and 100.000) are equipped with Luwa Filtrasept air outlets and Luwa filter ducts. The turbulent mixed flow with filtered supply air and induced room air causes a dilution of the liberated air impurities.
Clean room with defined high-purity working areas
Clean rooms of grades 3 or 4 (resp. 100 and 1.000) with Luwa clean air distributors type CG for vertical or horizontal laminar flow with or without lateral limitation of air distribution. The discharged air keeps the surrounding room as well as the air locks or cloakrooms clean.
Clean rooms of grade 3 (resp. 100), with the entire ceiling and wall surface fitted with Luwa clean room filters or Luwa clean air distributors type CG. Thanks to the low-turbulence displacement flow, they satisfy the highest demands of air purity in an extended working area.
Clean Room Units
Clean room units of various concepts for measuring and test rooms as well as for the elimination of cross contamination in processing highly active ingredients in the pharmaceutical industry. Equipped with multistage Luwa Ultra-filters and the Luwa clean air distributor type CG, they are distinguished by a great adaptability thanks for their utilization of standardized elements.
Pharmaceutical Industry (English only)
The pharmaceutical industry processes a diverse spectrum of active ingredients into highly effective medicaments, which are dispensed in numerous forms such as tablets, effervescent tablets, injection solutions etc. Therefore, in manufacture, packing and final control strict quality and purity specifications have to be maintained.
The air engineering plants for research and manufacture in the pharmaceutical industry have to satisfy the most varied requirements, so that their division into numerous subsystems is necessary. The planning of complete plants presupposes a wide range of experience and specialist knowledge in application technology.
Within this framework clean room installations have to ensure,
- that the sterility of injection solution (which do not often permit a subsequent heat sterilization) remains
guaranteed during the entire processing and packing,
- that the pollution of preparation by agent foreign to the product is impossible, and
- that the protection of personnel entrusted with the manipulator of highly active ingredients, is ensured at all times.
The Luwa clean room systems individually adjusted to the respective conditions allow the protection of critical processing stages at favorable investment and operating costs.
Manufacture of Microelectronic Components (English only)
Manufacture of Microelectronic Components
The miniaturization of electronic modules enables the accommodation of a large number of functional units in the smallest space and the achievement of extremely short switching times. It thereby forms the basis for the remarkable improvements in products of the electronics industry with regard to price and efficiency.
Clean raw material, clean working media and a clean workplace environment are indispensable prerequisites for these results.
The contribution of Luwa clean room technology to this are energy-optimized system solutions, which are exactly adapted to the respective manufacturing conditions and in addition can be flexibly adjusted to the frequent process changes.
Research in Micro-technique (English only)
Research in Micro-technique
The accelerated development in micro technique is based on intensive research aimed at basic principles and production processes for manufacturing novel integrated circuits and storage elements.
Clean room systems are an absolute necessity for carrying out experimental investigations in this field. In addition to the extreme requirements of air purity the closest temperature tolerances have also to be met for the perfect operation of highly sensitive measuring instruments. Beyond meeting these demands Luwa clean room installations are eminently suited for this field of application because of their high adaptability and flexibility towards the constantly changing experimental programs.