936 resultados para Mustakallio, Hannu


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Kirjallisuusarvostelu

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Kirjallisuusarvostelu

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Kirjallisuusarvostelu

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Artikkeli perustuu tekijän kunnallistalouden väitöskirjaan, joka tarkastettiin Tampereen yliopistossa 27.10.2006.

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Työn tavoitteena oli yhtenäisen toimintamallin luominen kohdeyrityksen materiaalitoiminnoille tuotannon kokoonpano-osastolla ja kokoonpanoa palvelevissa varastoissa. Toimintamallin tuli kattaa nimikkeiden siirrot ja siirtoihin liittyvät toimet toiminnanohjausjärjestelmässä. Lisäksi toimintamallin tuli vähentää saldovirheitä ja niistä johtuvia osapuutteita ja inventaarioepäselvyyksiä. Nykytilan kartoituksella yksilöitiin oleellisimmat kehityskohteet saldovirheiden eliminoimiseksi. Myös yrityksen lean-implementoinnin vaatimukset materiaalitoimintojen luotettavuudelle oli huomioitava. Kehityskohteiden tehostustoimista luotiin materiaalitoimintojen malli, joka yhtenäistää käytäntöjä ja vähentää operatiivisia saldojen hallinnan haasteita.

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This work aimed to find out the suitability of foam as medium in application of thin liquid films. This consists of research over phenomena related to foam physics and behaviour. Solutions and mixtures to be foamed, foaming agents, foam generation and application methods were evaluated. Over the evaluated solutions and mixtures coating paste and CMC did not foam well. Latex and PVA solutions were foamable and the best solution for foam use was starch. PVA and casein can be used as foaming agents, but the best results were achieved with sodium dodecyl sulphate (SDS). SDS works well with starch solutions producing fine and stable foam. Foaming was done with simple mixers where pressurized air was fed to the solution. The foaming works fine when enough shear force is used together with sufficient foaming agent concentration. Foam application with curtain, rod and cylinder methods with a gap between the application device and paper were not usable because of high coating amount. Coating amounts were smallest with the blade method which achieved 0.9 g/m2 starch layer. Although some strength decrease was expected because of the foaming agent, it dit not have significant effect. The targeted coating amount of 0.5 g/m2 was not achieved due to the limitations with the methods. More precise foam application methods are needed. Continuous foam generation and feed to the paper surface with controllable device such as application teeth could improve the results.