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REPULPABLE TAPES

REPULPABLE TAPES. Types of splices. butt (by a single coated tape) overlap (by a double coated tape) flying (by a double coated tape). Butt splices. Overlap splices. Flying splice. Types of splices. Butt splices. Butt splices.

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REPULPABLE TAPES

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  1. REPULPABLE TAPES

  2. Types of splices • butt (by a single coated tape) • overlap (by a double coated tape) • flying (by a double coated tape)

  3. Butt splices Overlap splices Flying splice Types of splices

  4. Butt splices

  5. Butt splices • the splice applied only on one side allows thinner splices but the adhesive could get through the two edges of paper and sticks to the layer below

  6. Butt splices • applying two tapes (one per side) you avoid this issue and for reducing the thickness you could use tapes of different widths and/or shift them to each other

  7. Butt splices • compared to overlap splices, butt splices usually allow the splice to be thinner • a thin splice is important because it has to pass through narrow gaps of the producing or converting machines (for example the gap between calender rolls)

  8. Butt splices • They are mainly used at • rereelers and rewinders • especially when the splice has to go to papermill final Customer • Rereeler - An intermediate winding machine for large rolls • Rewinder - A winding machine typically composed of an unwind, slitters, and windup

  9. Butt splices • The contact between the 2 reels to be spliced happens while the machine is not running (“STATIC” splice) • both the application of the tape and the splicing contact are obtained manually (“MANUAL” splice) • they may stay inside also for a long time before the reel is reprocessed (“PERMANENT” splice)

  10. Butt splices • STATIC AND MANUAL: there is no need for a product with a very high tack; usually also a medium tack is sufficient • PERMANENT: none of the components of the adhesive has to migrate into the spliced paper (by heat and/or pressure); otherwise we could have a “bleeding” effect

  11. Butt splices • The following products DO HAVE these characteristics: • repulpability according to TAPPI UM 213A • adhesives without any migrating components (no bleeding) • good adhesion/tack balance • excellent shear resistance • 200°C temperature resistance (for short periods)

  12. Butt splices. How to match the right product • BN 6368 • single coated, with a release liner, standard choice • slit liner, red printed and rally stripe versions

  13. Butt splices. How to match the right product • BN 6368 THIN • as BN 6368 but with a calandered paper backing (lower thickness) • to strenghten the overlap manual splice (safety splice) • slit liner, red printed and rally stripe versions

  14. Butt splices. How to match the right product • BN 6369 • as BN 6368 but with a tissue paper backing (very low thickness) • to strenghten the overlap manual splice (safety splice)

  15. Butt splices. How to match the right product • BN 6370/6375/6376/6373/6383 • single coated, linerless, siliconized backing • various thicknesses and colours • used for high tensile strength types of paper • the splice cannot be printed or coated because of the siliconized backing

  16. BN 6368/6368TH BN 6368/6368TH BN 6369/6368TH Typical butt splices

  17. Overlap splices • simple overlap (by double coated tape) • strengthened overlap (by double coated + 1 or 2 single coated tapes)

  18. Overlap splices • They are mainly used at • rereelers and rewinders (like butt splices) • supercalenders • sheeters

  19. Overlap splices • Like butt splices, they are made: • while the machine is not running (“STATIC” splice) • manually (“MANUAL” splice) • also, they may stay inside also for a long time before the reel is reprocessed (“PERMANENT” splice)

  20. Overlap splices • STATIC AND MANUAL: there is no need for a product with a very high tack; usually also a medium tack is sufficient • PERMANENT: none of the components of the adhesive has to migrate into the spliced paper (by heat and/or pressure); otherwise we could have a “bleeding” effect

  21. Overlap splices. How to match the right product • BN 6367 • double coated, standard choice

  22. Overlap splices. How to match the right product • BN 6365 • double coated • faster repulpability and greater adhesion compared to BN 6367

  23. Overlap splices. How to match the right product • BN 6367 HT • double coated • higher amount of adhesive (High Tack) compared to BN 6367 • for heavy weight papers • for core starting applications

  24. BN 6367/6365/6367HT BN 6367/6365/6367HT BN 6368TH/6369 Typical overlap splices SIMPLE STRENGTHENED

  25. Paster tabs • used during automatic splice preparation to fix the last lap of the reel • they are needed to avoid the lifting of the last lap during the initial reel rotation • when there is the splicing contact they must easily break

  26. Paster tabs • single coated • different shapes • trapezoid • butterfly • butterfly rectangular

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