Spe­cial sys­tem for 5-layer PP-R Pipe with fiber­glass

DEMM Engineering & Manufacturing - - PRODUCT WATCH - DE­TAILS, NZ REP, GARY BROWN PH: 00 61 2 8814 3100, GARY@HBM.COM.AU

KraussMaf­fei Ber­storff worked in close col­lab­o­ra­tion with Polo­plast GmbH, a lead­ing Ger­man plas­tic pipe man­u­fac­turer and long-time cus­tomer, to de­velop a spe­cial con­cept for man­u­fac­tur­ing five-layer PP- R pipes with fiber­glass re­in­force­ment. The sys­tem was suc­cess­fully com­mis­sioned at the Polo­plast’s plant in Eben­hofen, Bavaria, in Novem­ber of last year. Polo­plast has also re­ceived prod­uct ap­proval and au­tho­riza­tion to pro­duce the pipes used for drink­ing wa­ter and air- con­di­tion­ing sys­tems (for the di­am­e­ter range of 32–250 mm).

Both the ma­te­rial composition and the lay­ered struc­ture of the PP- R pipes are in­no­va­tions. As a re­sult, the au­tho­riza­tion re­quire­ments are ap­pro­pri­ately strin­gent.

Even though KraussMaf­fei Ber­storff boasts a great deal of ex­per­tise in multi-layer sys­tems, the project de­vel­oped for Polo­plast was spe­cial and unique. “We mod­i­fied the spi­ral dis­trib­u­tor sys­tem de­sign to meet the re­quire­ments for the in­di­vid­ual lay­ers spe­cific thick­ness,” ex­plains An­dreas Kessler, Gen­eral Sales Man­ager for KraussMaf­fei Ber­storff at the Mu­nich lo­ca­tion. In ad­di­tion, “the ex­truder/pipe head com­bi­na­tion has been de­signed to save a lot of space and has an eco­nomic foot­print.”

The KME 45-30 B/R main ex­truder, which fea­tures the KM-5L RKW 94-250 pipe head for pro­duc­ing the PP- R in­ter­me­di­ate layer, is closely sur­rounded by four co- ex­trud­ers from the same se­ries, ar­ranged in a half- cir­cle, as well as the KME 20-25 B/R co- ex­truder for ap­ply­ing stripes. This set- up lets the ma­chine op­er­a­tor con­trol and mon­i­tor pro­duc­tion from a cen­tral po­si­tion. In ad­di­tion, the pipe head fea­tures en­ergy- ef­fi­cient IPC (In­ter­nal Pipe Cool­ing), which en­sures pre­cise heat balance for thick-walled pipes.

The stand­out prop­erty of PP- R pipes with fiber­glass re­in­force­ment lies in the low de­gree of elon­ga­tion and bend­ing. This gives the pipe a stiff­ness that is many times higher, which in turn pro­vides ad­van­tages when lay­ing pipe. The pipes are very fre­quently in­stalled so that they are ex­posed un­der sus­pended ceil­ings – es­pe­cially in pub­lic build­ings.

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