SC-paperirullien vanaisuuden syntymekanismien selvittäminen
Turkki, Juha (2005)
Diplomityö
Turkki, Juha
2005
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe20051988
https://urn.fi/URN:NBN:fi-fe20051988
Tiivistelmä
Myllykoski Paper Oy:n PK6:n kapeiden asiakasrullien vanoittuminen on aiheuttanut tuotannonmenetyksiä. Tämän työn tavoitteena oli pyrkiä selvittämään SC-paperirullissa esiintyvän vanaisuuden syntymekanismeja ja sitä, kuinka pituusleikkurilla voitaisiin vähentää vanan muodostumista asiakasrulliin. Työn kirjallisuusosassa selvitettiin rullaustapahtumaa pituusleikkurilla, paperin rullautuvuuteen vaikuttavia tekijöitä ja SC-paperille soveltuvia pituusleikkurityyppejä. Tässäyhteydessä syvennyttiin vanan syntymekanismeihin ja vanan syntymisen mahdollisiin ehkäisymenetelmiin. Vanan muodostumiseen vaikuttavat rainassa olevat jyrkät muutokset mm. neliömassa- ja paksuuspoikkiprofiileissa sekä pituusleikkurin rullausasemien linjauksen virheellisyys. Työn kokeellinen osa jakautui kahteen osaan.Esikokeissa tilastoitiin vanarullien muodostuminen eri pituusleikkurin rullausasemien, rullausposition ja käytetyn superkalanterin mukaan. Vanarullien paperista tutkittiin poikkisuuntaisia profiileja vanan syntysyiden löytämiseksi. Vanarullat olivat pääasiassa rainan reunoista leikattuja ja esikokeiden aikana suurin osan vanarullista muodostui superkalanteri II:n tambuureista. Koeajossa tutkittiin pituusleikkurin ajoparametrien ja rullausposition vaikutusta vanan muodostumiseen kapeassa rainan reunaosasta leikattavassa rullassa. Paperissa olevan profiilivian aiheuttamaa vanaa ei pystytty poistamaan ajoparametrimuutoksilla poistamaan koeajossa. Pituusleikkurin rullausasemien ja telojen linjaus sekä liikkuvien osien välysten poistaminen vähensi vanan muodostumista. Paperin neliömassa- ja paksuusprofiileissa kapealla alueella tapahtuvat jyrkät muutokset lisäsivät merkittävästi vanan muodostumista. Paperin profiilien hallinnalla ja pituusleikkurin kuluvien osien ennakoivalla huollolla voidaan vähentää vanan muodostumista asiakasrulliin. The corrugation on narrow customer rolls has caused production losses at
Myllykoski Paper PM6. The purpose of this study was to find out the
emergence of paper corrugation in SC-paper and how this phenomenon
can be prevented in customer rolls at the winder.
In the theoretical section of this study winding and roll structure, paper
properties that have an effect on roll structure and suitable winder types
for SC-paper were studied. In this study were engrossed in the origins of
the corrugation and possible preventive means. E.g. gradient variations in
cross directional profiles and alignment of winding stations affect to the
emergence of corrugation in customer rolls.
The experimental part of this study was divided into two sections. In the
pre-trial part the occurrence of corrugated customer rolls was studied
statistically according to winding station, winding position and
supercalender. Cross- directional profiles of the corrugated paper were
measured to define the origins of the corrugation. Corrugated rolls during
pre-trial part were cut mainly from web edges and the corrugated rolls
were winded from the reels calendered on supercalender II.
The effects of the winding parameters and winding position on corrugation
on narrow edge rolls were studied at the winder trials. Changes of winder
parameters during trials did not prevent the emergence of corrugation
because of the poor cross directional profiles of the web.
Alinement of the winding station and winders rolls and tightening of the
moving parts reduced corrugation. Narrow and steep variations in basis
weight and thickness profiles increased the corrugation. Sufficient profile
control and proactive maintenance of moving parts at the winder were
found to decrease the corrugation of customer rolls.
Myllykoski Paper PM6. The purpose of this study was to find out the
emergence of paper corrugation in SC-paper and how this phenomenon
can be prevented in customer rolls at the winder.
In the theoretical section of this study winding and roll structure, paper
properties that have an effect on roll structure and suitable winder types
for SC-paper were studied. In this study were engrossed in the origins of
the corrugation and possible preventive means. E.g. gradient variations in
cross directional profiles and alignment of winding stations affect to the
emergence of corrugation in customer rolls.
The experimental part of this study was divided into two sections. In the
pre-trial part the occurrence of corrugated customer rolls was studied
statistically according to winding station, winding position and
supercalender. Cross- directional profiles of the corrugated paper were
measured to define the origins of the corrugation. Corrugated rolls during
pre-trial part were cut mainly from web edges and the corrugated rolls
were winded from the reels calendered on supercalender II.
The effects of the winding parameters and winding position on corrugation
on narrow edge rolls were studied at the winder trials. Changes of winder
parameters during trials did not prevent the emergence of corrugation
because of the poor cross directional profiles of the web.
Alinement of the winding station and winders rolls and tightening of the
moving parts reduced corrugation. Narrow and steep variations in basis
weight and thickness profiles increased the corrugation. Sufficient profile
control and proactive maintenance of moving parts at the winder were
found to decrease the corrugation of customer rolls.