Process for Manufacturing a Water-Resistant Telecommunication Cable
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Abstract
A process for manufacturing a water-resistant telecommunication cable. The cable has a solid and compact element having a water-soluble polymer material having vinyl alcohol/vinyl acetate copolymer having a hydrolysis degree of 60-95% and a polymerisation degree higher than 1,800 and at least one solid low-melting and one solid high melting plasticizers. The process produces continuously the water-soluble polymer material by separately feeding, in sequence, a multi-screw extruder, in the flow direction, with the copolymer and the high melting plasticizer melting and mixing them while transporting them through the extruder, and with the low melting plasticizer, melting and mixing them with the copolymer and the high melting plasticizer, subsequently homogenizing the copolymer and the plasticizers and finally discharging the melt, at a temperature lower than or equal to 205° C. A process for extruding the above PVA based water-soluble polymer material. The process allows extrusion of PVA with an enhanced productivity and reproducibility requiring shorter times for absorbing the plasticizers onto the polymer.
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Citations
97 Claims
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1-48. -48. (canceled)
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49. A process for manufacturing a water-resistant telecommunication cable comprising a solid and compact element housing at least one transmitting element, wherein the solid and compact element comprises a water-soluble polymer material comprising:
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a vinyl alcohol/vinyl acetate copolymer having a hydrolysis degree of 60-95% and a polymerisation degree higher than 1,800;
at least a first solid plasticizer, having a melting point of 50-100°
C., and a second solid plasticizer having a melting point equal to or higher than 140°
C., in an amount of 10-30 and 1-10 parts by weight per hundred parts by weight of the copolymer, respectively;
the water-soluble polymer material having;
a complex modulus equal to or higher than 2.5×
106 MPa;
a ratio of the viscous modulus to the elastic modulus equal to or lower than 2.30;
a glass transition temperature of 20-35°
C.;
the process comprising;
continuously producing the water-soluble polymer material by separately feeding in sequence a multi-screw extruder, in the flow direction, with the copolymer and the second solid plasticizer;
melting and mixing the copolymer and the second solid plasticizer at 170-220°
C.;
melting and mixing the first solid plastizer with the second solid plasticizer and the copolymer at 140-180°
C.;
subsequently homogenizing the copolymer and the plasticizers at 100-150°
C.; and
discharging the melt, at a temperature lower than or equal to 205°
C. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94)
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95. A process for extruding a water-soluble polymer material comprising:
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a vinyl alcohol/vinyl acetate copolymer having a hydrolysis degree of 60-95% and a polymerisation degree higher than 1,800;
at least a first solid plasticizer, having a melting point of 50-110°
C., and a second solid plasticizer, having a melting point equal to or higher than 140°
C., in an amount of 10-30 and 1 -10 parts by weight per hundred parts by weight of the copolymer, respectively;
the water-soluble polymer material having;
a complex modulus equal to or higher than 2.5×
106 MPa;
a ratio of the viscous modulus to the elastic modulus equal to or lower than 2.30;
a glass transition temperature of 20-35°
C.;
the process comprising continuously producing the water-soluble polmer material by separately feeding in sequence a multi-screw extruder, in the flow direction, with the copolymer and the second solid plasticizer;
melting and mixing the copolymer and second solid plasticizer at 170-220°
C.;
melting and mixing the first solid plasticizer with the second solid plasticizer and the copolymer at 140-180°
C.;
subsequently homogenizing the copolymer and the plasticizers at 100-150°
C.; and
discharging the melt at a temperature lower than or equal to 205°
C. - View Dependent Claims (96, 97)
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Specification