Specification : 150mm ,160mm , 180mm Material : vinylon aldehyde silk of completely molded nip slice Central rope : plastic rope , fibrous rope General introduction : Combined double rings packing combines the advantages of soft packing and half soft packing ,conquers their disadvantages .They are ideal products used in bio-chemistry treatment process of sewage . The product depends on plastic rings as its framework ,loading the vinylon silk which fixed firmly on plastic rings . The silk bunches distribute evenly in the water ,easily producing and changing films, good applicability to sewage concentration . (1) Some of the technical indices of combined double ring packing are as stated: Type :150-60 ; Diameter of plastic ring( mm) :75; Diameter of slice packing (mm ):150; Distance between the slice (mm):60; Distance between inner disposal of the pool(PCE /m 3 pool ) :150; Packing density (PCE/m 3 pool ) :About 740 ; Theoretical specific surface area (m 2 /m 3 /pool ) :2600; Unit weight (kg/m 3 ):About 4.5 ; Basic weight after film (kg/m 3 pool ):About 600 ; Normal load KgCOD/m 3 :3-3.5 ; Impact load KgCOD/m 3 :> 5 . Type :150-80 ; Diameter of plastic ring( mm) :75; Diameter of slice packing (mm ):150; Distance between the slice (mm) :80; Distance between inner disposal of the pool(PCE /m 3 pool ) :150; Packing density (PCE/m 3 pool ) :About 555; Theoretical specific surface area (m 2 /m 3 /pool ) :2000; Unit weight (kg/m 3 ) :About 3.5 ; Basic weight after film (kg/m 3 pool ) :About 450 ; Normal load KgCOD/m 3 :2.5-3 ; Impact load KgCOD/m 3:> 5 . (3)The technical indices of the combined multi-hole rings packing are as follows: Framework diameter mm : 55 ; Framework height mm : 75 ; Packing diameter mm : 150 ; Unit weight g/ piece : 15-17 ; Weight of unit fibre g/piece : 2.0 ; Packing density Piece /m 3 (pool) : 592 ; Theoretical specific surface area m 2 /m 3 (pool) : 1900 ; Normal load kg COD/m 3 (pool) : 3.0-3.5 ; Compact load kg COD/m 3 (pool) : >5 .