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[{"key": "dc.contributor.advisor", "value": "Raimo, Al\u00e9n", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Syrj\u00e4l\u00e4, Pirkko", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Rissanen, Timo", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Konn, Jonas", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Suuronen, Satu", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2017-12-18T06:49:26Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2017-12-18T06:49:26Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2017", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1809875", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/56384", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "T\u00e4m\u00e4n pro gradu -tutkielman tarkoituksena oli perehty\u00e4 valkaistun kemitermomekaanisen massan (BCTMP) valmistukseen, sen valkaisuun sek\u00e4 tuotetun massan ominaisuuksiin. Erityisesti ty\u00f6ss\u00e4 k\u00e4siteltiin erilaisia valkaisukemikaaleja sek\u00e4 valkaisutapoja. BCTMP:n valmistuksessa k\u00e4ytetyt kemikaalit ovat avainasemassa massan valmistuksen energiankulutuksessa sek\u00e4 haluttujen ominaisuuksien saavuttamisessa.\n\nVerrattuna kemiallisen massan valmistukseen, mekaanisessa massassa siihen j\u00e4tett\u00e4v\u00e4 ligniini teett\u00e4\u00e4 prosessissa haastetta. Puuainekseen j\u00e4tettyn\u00e4 ligniini takaa massaan korkean saannon, jopa yli 90 %, mutta alentaa sen vaaleutta. Ligniinin v\u00e4rilliset kromoforiset ryhm\u00e4t pyrit\u00e4\u00e4n muuntamaan v\u00e4ritt\u00f6m\u00e4\u00e4n muotoonsa valkaisun avulla. T\u00e4ll\u00e4 hetkell\u00e4 k\u00e4ytetyin menetelm\u00e4 on hapettava valkaisu peroksidilla 2-vaiheisesti. Peroksidin tiedet\u00e4\u00e4n kuitenkin sy\u00f6v\u00e4n bulkkia, jonka vuoksi rinnalle tai tilalle etsit\u00e4\u00e4n valkaisukeinoja esimerkiksi pelkist\u00e4vist\u00e4 kemikaaleista. Muita prosessissa oleellisia vaiheita massan ominaisuuksien kannalta ovat imeytys, jauhatus ja lajittelu.\n\nBCTMP:a k\u00e4ytet\u00e4\u00e4n paljon monikerroksisen taivekartongin keskikerroksessa. Taivekartongin kannalta t\u00e4rkeit\u00e4 ja seurattuja ominaisuuksia ovat bulkki, palstautumislujuus sek\u00e4 optiset ominaisuudet kuten vaaleus, valonsironta ja opasiteetti. Kaikkiin n\u00e4ihin vaikuttaa suuresti imeytyksess\u00e4 ja valkaisussa k\u00e4ytett\u00e4v\u00e4t kemikaalit, jonka vuoksi valkaisun optimoinnin voi sanoa olevan \u00e4\u00e4rimm\u00e4isen t\u00e4rke\u00e4 osa-alue ajatellen koko prosessia. Kuluttajien halutessa koko ajan kevyemp\u00e4\u00e4 ja vaaleampaa lopputuotetta pit\u00e4\u00e4 massan valmistuksen kehitty\u00e4 rinnalla vastaamaan sille asetettuihin tavoitteisiin.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Satu Suuronen (sakrsuur) on 2017-12-18 06:49:25.449113. 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 2017-12-18T06:49:26Z\nNo. of bitstreams: 2\nURN:NBN:fi:jyu-201712184733.pdf: 2229241 bytes, checksum: 67b525eb6be98193fa2e91170ded3296 (MD5)\nlicense.html: 4792 bytes, checksum: 294bd73967bf8506bfeab8d3e99b7ecc (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2017-12-18T06:49:26Z (GMT). No. of bitstreams: 2\nURN:NBN:fi:jyu-201712184733.pdf: 2229241 bytes, checksum: 67b525eb6be98193fa2e91170ded3296 (MD5)\nlicense.html: 4792 bytes, checksum: 294bd73967bf8506bfeab8d3e99b7ecc (MD5)\n Previous issue date: 2017", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (87 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": "Kemitermomekaaninen massa", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "BCTMP", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "peroksidi", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "ditioniitti", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Kemitermomekaanisen massan valkaisu", "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-201712184733", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Kemian laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Chemistry", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Soveltava kemia", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Applied Chemistry", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.date.updated", "value": "2017-12-18T06:49:26Z", "language": null, "element": "date", "qualifier": "updated", "schema": "dc"}, {"key": "yvv.contractresearch.collaborator", "value": "business", "language": null, "element": "contractresearch", "qualifier": "collaborator", "schema": "yvv"}, {"key": "yvv.contractresearch.initiative", "value": "order", "language": null, "element": "contractresearch", "qualifier": "initiative", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": "fi", "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4036", "language": null, "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "valkaisu", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.type.okm", "value": "G2", "language": null, "element": "type", "qualifier": "okm", "schema": "dc"}]
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