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PAPER DRYING UNDER Z-DIRECTION RESTRAINT TO IMPROVE THE STRENGTH PROPERTIES OF THE SHORT-FIBRE HIGH YIELD PULPS

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THIS STUDY IS INTENDED TO ASSESS WHETHER THE APPLICATION OF THE PROCESS OF PAPER DRYING UNDER Z-DIRECTION RESTRAINT TO HIGH YIELD SHORT FIBRE PULPS OF LOW OR MEDIUM GRADE IS ABLE TO IMPROVE, AND TO WHAT EXTENT, THOSE PAPER WHICH ARE PARTICULARLY IMPORTANT FOR USE IN LINERBOARD AND CORRUGATING MEDIUM.

THE PROPOSAL OF THIS RESEARCH HAS ITS BACKGROUND IN IMPORTANT STUDIES, BOTH FUNDAMENTAL AND TECHNOLOGICAL, WHICH WERE PERFORMED IN THE PAST YEARS AT THE FOREST PRODUCTS LABORATORY IN MADISON, WIS. (USA) AND AT THE SWEDISH FOREST PRODUCTS RESEARCH LABORATORY IN STOCKHOLM.

THE RESULTS OF THESE STUDIES HAVE SHOWN THAT THE DRYING OF PAPER UNDER Z-DIRECTION RESTRAINT (COMMONLY CALLED "PRESS DRYING") RESULTS IN MARKED IMPROVEMENTS OF THE STRENGTH PROPERTIES, OF SOME PARTICULAR INPORTANCE WHEN THE PULPS ARE USED IN LINERBOARDS. THE IMPROVEMENTS, OBTAINED FROM THE STUDIES CARRIED OUT AT THE FOREST PRODUCTS LABORATORY, WERE ESPECIALLY INTERESTING FOR HIGH YIELD PULPS FROM NORTH AMERICAN HARDWOODS. THE RESEARCH IS INTENDED TO EVALUATE THE EFFECTS THAT PRESS DRYING CAUSES ON THOSE PAPER PROPERTIES WHICH ARE IMPORTANT FOR USE IN LINERBOARD AND CORRUGATING MEDIUM. A CONSIDERABLE IMPROVEMENT OF THESE PAPER PROPERTIES WOULD MEAN EITHER THE USE OF LOWER GRADE (HENCE CHEAPER) FURNISHES OR A DECREASE OF PAPER GRAMMAGE WITH THE FOLLOWING BENEFITS. THE FIBROUS RAW MATERIALS TO BE EVALUATED WOULD BE:

A- HIGH YIELD SEMICHEMICAL PULPS FROM EUROPEAN HARDWOODS (CHIMICA DEL FRIULI S.P.A.-TORVISCOSA (UDINE) AND CELLULOSA CALABRA S.P.A.-CROTONE (CATANZARO) ARE ABLE TO CO-OPERATE WITH THE SUPPLYING OF RAW MATERIALS)

B- PAPER FURNISHES OF VARIOUS GRADES COMMONLY USED BY THE ITALIAN PAPER INDUSTRY FOR THE MAKING OF LINEBOARD AND CORRUGATING MEDIUM (CARTIERE DI VERONA S.P.A.-MILANO ITALCARTA S.P.A.-PORCARI (LUCCA) AND CARTORRE S.P.A.-VOGHERA (PAVIA) HAVE DECLARED THEIR INTEREST TO CO-OPERATE BOTH WITH THE SUPPLYING OF RAW MATERIALS AND IN THE EVALUATION OF THE QUALITY OF THE PAPERS.

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Stazione Sperimentale per la Cellulosa, Carta e Fibre Tessili Vegetali ed Artificiali
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