GENERAL DESCRIPTION

THE CONVENTIONAL ION EXCHANGE PERFLUORINATED MEMBRANES REPAIR SYSTEM REQUIRES A LENGTHY PROCEDURE FOR PREPARATION OF THE PATCH.
THE CUTTING OF THE PATCH, OF THERMAL INSULATOR FILM, RECOGNITION OF THE CATHODE AND ANODE SIDES AS WELL AS CENTERING ARE DECISIVE FACTOR FOR SUCCESSFULL JOINING.
MOREOVER QUITE A PART FROM THE OPERATOR’S PREPARATION, IT IS EASY TO MAKE ACCIDENTAL MISTAKES.
ALL  THIS EINTAILS LENGTHY MAINTENANCE TIMES AS WEEL AS RISK OF FAULTY JOINING.
FOR THIS REASON WEPAC WAS DEVELOPED.

WEPAC IS A READY-TO-USE PATCH FOR REPAIRING ION EXCHANGE PERFLUORINATED MEMBRANES.
WEPAC AS BEEN DESIGNED TO BE USED SPECIFICALLY ON WELDING MACHINES OF THE WELNY SERIES.

WEPAC  CONSISTS OF A PATCH SLINGHTLY SMALLER THAN THE HEATING PLATEN PLUS A PROTECTIVE THERMAL INSULATOR FILM PREPOSITIONED ON THE CATHODE SIDE, AND CENTRED ON THE PATCH, WITH THE SAME SIZE AS THE OPENING OF THE MACHINE CENTERING FRAME.

THANK TO ITS ROUND CORNERS, WEPAC INSURES LESS CRITICAL JOINING IN THE VICINITY OF THE PATCH CORNERS.

THE USE OF WEPAC CONSIDERABLY REDUCES MAINTENANCE TIMES : MOREOVER THERE IS NO RISK OF ACCIDENTAL ERRORS IN REVERSED POLARITY WHILE THE CENTERING IS EASIER AND GUARANTEED.

ADVANTAGE

READY-TO-USE      
 IS ABLE TO PUT DIRECTLY IN THE CENTERING PLATE OF THE WELNY-A-3 WELDER

GUARANTEED CENTER

THE FILLET ON THE CORNER PATCH PREVENT CAME OFF BETWEEN MEMBRANE AND PATCH

ORIENTATION ANODE-CATHODE SIDE ARRANGED

NOT PERMITTED INVERSION ERROR

COMPOSITION KIT – WEPAC – 523 – PN 128-128

NBR. 50 WEPAC  40 x 40 – N350 – PN 128-124
PATCH SIZE :  35 x 35 mm
THERMAL  INSULATOR SIZE : 45 x 45 mm

NBR. 20 WEPAC 32 x 80 – N350 – PN 128-423
PATCH SIZE : 27 x 75 mm
THERMAL INSULATOR SIZE : 37 x 85 mm

 NBR. 10 WEPAC Ø 16 – N350 – PN 130-010
PATCH SIZE : Ø 16 mm
THERMAL INSULATOR SIZE : 45 x 45 mm

PATCH MATERIAL :

NAFION ^® 350/324 (is a trade-mark of DUPONT)

·          PERFLUOROSULFONIC ACID CATION EXCHANGE MEMBRANE OF OUTSTANDING CHEMICAL RESISTANCE FOR A VARIETY OF ELECTROLITIC PROCESSES.
·         STRONGER FIBER REINFORCEMENT THAN 324 IT HAS OTHERWISE THE SAME COMPOSITION OF SULFONIC  ACID POLIMER

PROPERTIES :

·          REINFORCEMENT: TEFLON
·          IONIC FORM: H+
·          RESISTANCE IN 0.6N KC1 AT 23° C ->  3.7 (Ω-cm²) ²
·          WEIGHT CALIBER AT 20°C, 50% RH -> 4.0 (g/dm²)
·          LINEAR EXPANSION FROM 50% RH AT 23°C TO WATER, 23°C, IN H+ FORM
·          MACHINE DIRECTION: 5 – 7%
·          TRANSVERSE DIRECTION:6– 8%

 THERMAL INSULATOR MATERIAL :

 KAPTON^® (is a trade-mark DUPONT)

· TYPE: HN
·FILM THICHNESS: 50.8 µm
· TENSILE STRENGTH AT 23°C: Min. 165 N/mm²
· ELONGATION: Min. 45 %
·   SHRINCAGE: Max. 2.5 %
·  MOISTURE ABSORPTION: Max. 4.0 %
·  DIELECTRIC STRENGTH AC:Min. 197 kV/mm
·  BRECKDOWNVOLTAGE  AC: Min. 10 000 V
·  VOLUME RESISTIVITY AT 200°C: Min. 10 ^12 Ω/cm
·  DIELECTRIC CONSTANT AT 1 kHz: Max. 3.9
·  DISSIPATION FACTOR AT 1 kHz: Max. 0.0036

WELDABLE MEMBRANE WITH WEPAC :

DUPONT MEMBRANE(APPROVED BY DUPONT)

ASAHI GLASS MEMBRANE (TESTED BY EUROPEAN BUILDING CONTRACTOR OF CHLOROALKALI PLANT AND CHLOROALKALI MANUFACTURER)

ASAHI CHEMICAL MEMBRANE (TESTED BY EUROPEAN BUILDING CONTRACTOR OF CHLOROALKALI PLANT AND CHLOROALKALI MANUFACTURER)

OPERATING PROCEDURE:

FOR GOOD JOINING WITH WEPAC AND CONSISTENTLY SAFE WORKING CONDITIONS, QUIVER LTD RECOMMENDS AS FOLLOWS:

·   OPEN THE VACUUM PUMP BEFORE WELDING TO PRESERVE THE OPERATOR HEALTH, A VACUUM SYSTEM PROVIDE TO ASPIRE OVER AND UNDER DIRECTLY FROM PATCH AREA AND TO COLLECT THE NOXIOUS HEAT FLUORINATED GASES DURING WELDING AND COOLING OPERATION.

 ·  CLEAN THE ZONE OF THE MEMBRANE TO BE REPAIRED AS DESCRIBED IN THE WELNY WELDER MAINTENANCE AND USE.

·  USE A MEMBRANE OR SCRAPS OF MEMBRANE OF THE SAME TYPE TO BE REPAIRED IN ORDER TO REACH THE RIGHT COMPROMISE BETWEEN THE NECESSARY PARAMETERS OF THE WELNY WELDING MACHINE.

-          WELDING TIME
-          COOLING TIME
-          WELDING PRESSURE
-          HEATING PLATE TEMPERATURE

 INDICATIVE GUIDE PARAMETERS:

·          WELDING TIME: 2/3 min.
·          COOLING TIME: 1/2 min.
·          WELDING PRESSURE: 3/4 min.
·          HEATING PLATE TEMPERATURE: 200 / 350° C

THE ABOVE DESCRIBED VALUES ARE GIVEN US A GUIDE ONLY BECAUSE IS NOT POSSIBLE TO DETERMINATE STANDARDIZED PARAMETERS FOR ALL THE MEMBRANES AS THESE DEPEND OF THE TYPE OF MEMBRANE, THE AMMOUNT OF WEAR, MOISTURE AND ROOM TEMPERATURE.

HENCE IT IS UP TO THE OPERATOR (BY CARRYING OUT SOME TESTES) TO OPTIMIZE THE PARAMETERS ON SCRAP MEMBRANES OR ON A SAMPLE  IN ORDER TO ARCHIVIE HIGH QUALITY JOINING.

AS THIS POINT YOU CAN PROCEEDE TO REPAIR YOUR MEMBRANES WITHOUT PROBLEMS AND WITH OPTIMUM RESULT.

OVERALL DIMENSIONS AND STORAGE OF KIT WEPAC

BOX DIMENSION : 100 x 60 x 100 mm
WEIGHT                : 500 g

INDIVIDUALLY PROTECTED AND HERMETICALLY SEALED WITH POLYETHYLENE  FILM.

WEPAC PATCHS HAVE TO BE STORED UNDER CONDITION OF RELATIVE UMIDITY 60/80% AND TEMPERATURE FROM 16 TO 20°C.

THE KIT IS SUPPLIED IN A RUGGED AND PRATICAL CASE OF HIGH QUALITY WOOD WITH RELATIVE CATCH.