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[{"key": "dc.contributor.advisor", "value": "Kataja, Markku", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Sillfors, Mikael", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Uotinen, Helmi", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2016-07-01T08:14:52Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2016-07-01T08:14:52Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2016", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1561645", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/50674", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Ty\u00f6ss\u00e4 perehdyttiin aallotuskartonkia valmistavan Heinolan Flutingtehtaan saostumisongelmien\nsyihin sek\u00e4 menetelmiin saostumisen est\u00e4miseksi. Haihduttamolla saostumat tukkivat\nhaihduttimien tuubil\u00e4mm\u00f6nvaihtimet ja rajoittavat haihduttamon toimintaa. Niukkaliukoisten,\np\u00e4\u00e4asiassa ep\u00e4orgaanisten kalsiumsuolojen muodostamien saostumien pesun\nvuoksi haihduttamo joudutaan seisauttamaan usein, mik\u00e4 rajoittaa koko tehtaan tuotantoa.\nKartonkikoneen m\u00e4rk\u00e4p\u00e4\u00e4ss\u00e4 saostumat ovat sen sijaan orgaanisia, p\u00e4\u00e4asiassa puun\npihkasta johtuvia, yhdisteit\u00e4. Kartonkikoneella saostumista seuraa likakatkoja ja hukkaaikaa.\nKirjallisuuden ja aiempien tutkimusten perusteella haihduttamon saostumien syyksi\nselvisi puusta haihdutettavaan laihalipe\u00e4\u00e4n liukeneva suuri kalsiumin m\u00e4\u00e4r\u00e4 sek\u00e4 saostuman\nmuodostumiselle jatkuvasti otolliset olosuhteet haihduttimissa. Koska kalsium on yhteinen\ntekij\u00e4 kaikkien haihduttimien saostumissa, tehokkain keino saostumien syntymisen\nv\u00e4ltt\u00e4miseksi olisi poistaa laihalipe\u00e4st\u00e4 kalsium ennen haihdutusta. Kalsiumkarbonaatin\nsaostumista keittoliuoksesta laboratoriossa tutkimalla saatiin selville, ett\u00e4 saostuminen\nvoitaisiin est\u00e4\u00e4 madaltamalla keittoliuoksen pH:ta tai l\u00e4mp\u00f6tilaa.\nLis\u00e4ksi ty\u00f6ss\u00e4 selvitettiin monielektrodisesti hapetus-pelkistyspotentiaalia mittaavan\nanturin soveltuvuutta saostumien hallintaan. Signaalien vaihteluiden syy-seuraussuhteiden\nselvityksell\u00e4 oli tarkoitus l\u00f6yt\u00e4\u00e4 vaihteluita ja saostumia aiheuttavat tekij\u00e4t. Laihalipe\u00e4linjassa\nanturista ei kuitenkaan ollut merkitt\u00e4v\u00e4\u00e4 hy\u00f6ty\u00e4, sill\u00e4 saostuminen haihduttamolla\non jatkuvaa, eik\u00e4 aiheudu liuoksen kemiallisen tilan vaihteluista. Kartonkikoneen\nm\u00e4rk\u00e4p\u00e4\u00e4ss\u00e4 sen sijaan saatiin selville joitakin mahdollisesti saostumia aiheuttavia mekanismeja.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Deposit and scaling problems at Heinola Fluting Mill were examined. Reasons and prevention\nmethods for deposit formation and scaling were evaluated in light of literature\nand previous studies. In the evaporator plant, scaling blocks the tube heat exchangers\nwhich restricts evaporation. Because of the washing of the sparingly-soluble inorganic\ncalcium salt scaling, the evaporator plant needs to be stopped frequently, which restricts\nproduction of the whole mill. In the wet end of the board machine deposits are organic\ninstead and originate mainly from wood extractives. Deposits in the wet end cause web\nbreaks and down time.\nFrom literature and previous studies it was concluded that the evaporator scaling\nis largely caused by the large amount of calcium dissolving from wood to spent liquor,\nwhich is fed into the evaporator plant. Moreover, the conditions in the evaporator plant\nare favourable for scale formation. Since calcium is the common factor in the scale of every\nevaporator unit, the most efficient scale prevention method would be removal of calcium\nfrom spent liquor prior to evaporation. By studying calcium carbonate deposition from\ncooking liquor in laboratory, it was found out that deposition could be prevented by\nlowering the pH or temperature of the cooking liquor.\nIn addition, a multi-electrode oxidation-reduction potential measuring probe was studied\nfor the use of deposit control. Fluctuations in the two probes\u2019 signals were studied in\norder to find the causes for deposit formation. In the case of spent liquor, however, the\nprobe was found unnecessary, because scaling in the evaporation plant is continuous and\nnot inflicted by fluctuations in the spent liquor chemistry. In the board machine wet end\ninstead, some possible deposit formation mechanisms were found out using the probe.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Helmi Uotinen (healuoti) on 2016-07-01 08:14:52.187514. Form: Pro gradu -lomake (https://kirjasto.jyu.fi/julkaisut/julkaisulomakkeet/pro-gradu-lomake). JyX data: [jyx_publishing-allowed (fi) =True]", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by jyx lomake-julkaisija (jyx-julkaisija.group@korppi.jyu.fi) on 2016-07-01T08:14:52Z\nNo. of bitstreams: 2\nURN:NBN:fi:jyu-201607013425.pdf: 3393286 bytes, checksum: a69f3647ffb0c50d1fd78f26cd6560a9 (MD5)\nlicense.html: 4821 bytes, checksum: ebfa668717f5f9a5410a83cf851260f0 (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2016-07-01T08:14:52Z (GMT). No. of bitstreams: 2\nURN:NBN:fi:jyu-201607013425.pdf: 3393286 bytes, checksum: a69f3647ffb0c50d1fd78f26cd6560a9 (MD5)\nlicense.html: 4821 bytes, checksum: ebfa668717f5f9a5410a83cf851260f0 (MD5)\n Previous issue date: 2016", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (104 sivua)", "language": null, "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "fin", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "m\u00e4rk\u00e4p\u00e4\u00e4", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "saostumat", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "NSSC", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "laihalipe\u00e4", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "haihduttamon likaantuminen", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Saostumat kartonkikoneen m\u00e4rk\u00e4p\u00e4\u00e4ss\u00e4 sek\u00e4 kemikaalikierrossa", "language": null, "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-201607013425", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": 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