{"id":5901,"date":"2026-08-20T09:51:02","date_gmt":"2026-08-20T01:51:02","guid":{"rendered":"https:\/\/www.bacintl.com\/?p=5901"},"modified":"2026-08-20T08:26:25","modified_gmt":"2026-08-20T00:26:25","slug":"working-principle-and-anti%e2%80%91contamination-mechanism-of-negative%e2%80%91pressure-weighing-booth-with-dual%e2%80%91system-of-laminar-air-supply-and-negative%e2%80%91pressure-pollution-control","status":"publish","type":"post","link":"https:\/\/www.bacintl.com\/fr\/working-principle-and-anti\u2011contamination-mechanism-of-negative\u2011pressure-weighing-booth-with-dual\u2011system-of-laminar-air-supply-and-negative\u2011pressure-pollution-control\/","title":{"rendered":"Working Principle and Anti\u2011Contamination Mechanism of Negative\u2011Pressure Weighing Booth with Dual\u2011System of Laminar Air Supply and Negative\u2011Pressure Pollution Control"},"content":{"rendered":"

\"\"<\/p>\n

Different from ordinary clean\u2011room equipment, the negative\u2011pressure weighing booth adopts a unique airflow design: air supply from top and air suction from bottom, clean airflow toward the working zone and negative\u2011pressure toward external environment. The two systems operate independently yet cooperate with each other to realize bidirectional protection.<\/p>\n

The upper section is the vertical laminar air\u2011supply system. After three\u2011stage filtration by G4 pre\u2011filter, F8 medium\u2011efficiency filter and H14 HEPA filter, air forms ISO Class 5 (Class 100) vertical laminar flow covering the weighing working area. It isolates dust and microorganisms from outside the booth to prevent the powder materials from external contamination, so as to guarantee material purity and product quality.<\/p>\n

The lower section and surrounding areas constitute the negative\u2011pressure dust\u2011collection and pollution\u2011control system. A stable slight negative\u2011pressure of 5\u201110\u202fPa is maintained inside the unit, building an inward airflow pressure gradient. Fine dust particles generated during powder weighing and feeding are rapidly drawn into the exhaust filtration system by negative\u2011pressure airflow, thoroughly preventing dust from escaping and spreading into the clean workshop. This mechanism fundamentally solves common problems of traditional open\u2011mode operation such as dust dispersion, workshop pollution and cross\u2011contamination between different materials.<\/p>\n

\"\"<\/p>\n

Coordination logic of dual\u2011systems<\/strong>: Laminar air supply guarantees material cleanliness, while negative\u2011pressure suction restrains dust diffusion. The supply\u2011and\u2011suction combination forms a stable closed\u2011loop airflow. It not only protects materials against contamination, but also keeps the workshop free of dust pollution, meanwhile prevents operators from inhaling powder dust. Triple objectives are achieved: material safety, environmental cleanliness and personnel protection.<\/p>\n

\"\"<\/p>\n

The whole system delivers stable airflow without eddies or dead corners, with efficient dust interception. It fully satisfies mandatory GMP requirements on cross\u2011contamination prevention and dust control for powder\u2011handling processes, and serves as essential compliant equipment for powder\u2011related operations in pharmaceutical, chemical and food industries.<\/p>","protected":false},"excerpt":{"rendered":"

The negative\u2011pressure weighing booth is dedicated purification equipment for powder weighing, batching and sampling processes. Relying on the coordinated operation of dual\u2011systems including laminar clean air supply and negative\u2011pressure dust collection & pollution control, it addresses three major industry pain points: material contamination, dust escape and operator health hazards. This paper deeply analyzes the operating principle, coordination logic and core anti\u2011contamination mechanism of the dual\u2011system, and illustrates its key advantages for GMP compliance.<\/p>","protected":false},"author":3,"featured_media":5902,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[92],"tags":[],"class_list":["post-5901","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-technology"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.bacintl.com\/fr\/wp-json\/wp\/v2\/posts\/5901","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bacintl.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bacintl.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bacintl.com\/fr\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bacintl.com\/fr\/wp-json\/wp\/v2\/comments?post=5901"}],"version-history":[{"count":2,"href":"https:\/\/www.bacintl.com\/fr\/wp-json\/wp\/v2\/posts\/5901\/revisions"}],"predecessor-version":[{"id":5906,"href":"https:\/\/www.bacintl.com\/fr\/wp-json\/wp\/v2\/posts\/5901\/revisions\/5906"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bacintl.com\/fr\/wp-json\/wp\/v2\/media\/5902"}],"wp:attachment":[{"href":"https:\/\/www.bacintl.com\/fr\/wp-json\/wp\/v2\/media?parent=5901"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bacintl.com\/fr\/wp-json\/wp\/v2\/categories?post=5901"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bacintl.com\/fr\/wp-json\/wp\/v2\/tags?post=5901"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}