KWS High efficiency filter without partitions

Section 1: Core Structure and Working Principle

The non-woven high-efficiency filter (also known as the pleated high-efficiency filter) is a core component of modern cleanroom technology. Its most distinctive feature is the elimination of traditional metal separator plates found in conventional high-efficiency filters . Instead, the core filter media—typically made of  ultra-fine glass fibre filter paper  or polypropylene (PP) melt-blown material —is precisely folded into dense, wave-like pleats. These pleats are bonded, supported, and spaced using special  hot-melt adhesive lines (adhesive strips) , ensuring the filter media does not collapse under airflow pressure and maintaining uniform airflow channels. The entire filter unit is strictly sealed within an  aluminium alloy or stainless steel outer frame , with high-performance sealant applied at the joints and elastic seals on the frame edges to ensure no leakage after installation. Its filtration mechanism combines  interception effect (sieving), diffusion effect (Brownian motion), inertial collision effect , and possible electrostatic effects to efficiently capture particles as small as ≥0.3 microns (HEPA-grade) or ≥0.1 microns (ULPA-grade).

 Second Section: Significant Performance Advantages and Application Areas

Thanks to its innovative non-woven design, this filter can accommodate  more effective filtration area  within the same volume, offering multiple core advantages:  1) Higher airflow/lower air resistance : Lower initial resistance at the same airflow significantly reduces system energy consumption; or provides higher airflow at the same resistance; 2) Lighter weight : Eliminating metal separators significantly reduces weight, facilitating installation and maintenance;  3) Higher dust-holding capacity: The dense pleated structure provides greater dust-holding space, extending service life. Its filtration performance meets the stringent  HEPA (efficiency ≥ 99.97%@0.3μm) or ULPA (efficiency ≥ 99.999%@0.1μm) standards**, capable of capturing submicron-sized contaminants such as bacteria, viral particles, and dust. Therefore, it has become the absolute mainstay for terminal filtration in ultra-clean environments such as  biological safety laboratories, hospital operating rooms/ICUs/negative pressure wards, pharmaceutical GMP sterile workshops, and microelectronics semiconductor cleanrooms , as well as a key component in high-end air purifiers, FFUs (fan filter units), clean benches, and biological safety cabinets.

 Third paragraph: Key value and maintenance points

As the ‘precision guardian’ against invisible threats in the air, the non-woven high-efficiency filter is an indispensable barrier for ensuring personnel health, experimental accuracy, and product quality. It plays a decisive role in preventing the spread of pathogenic microorganisms, ensuring chip yield rates, and maintaining the sterility of pharmaceuticals. Their performance degrades over time due to dust accumulation (increased resistance and potential efficiency fluctuations), soregular airflow/resistance monitoring and particle counting tests are critical. Based on cleanroom requirements and actual contamination loads, a scientific replacement schedule (typically 1–5 years) must be established to prevent filter failure or contamination from prolonged use. When selecting filters, it is essential to strictly match the cleanliness grade (e.g., ISO 14644 standard), temperature and humidity resistance characteristics, and frame material (stainless steel is preferred in corrosive environments), and ensure proper installation by professionals to guarantee reliable sealing, thereby continuously safeguarding the utmost purity of the air.