Sökning: "polymer discoloration"

Hittade 3 uppsatser innehållade orden polymer discoloration.

  1. 1. The discoloration of polyethylene obtained from chemical separation of laminates: Investigating additives and other potential causes

    Master-uppsats, Lunds universitet/Förpackningslogistik

    Författare :Can Feng; [2021]
    Nyckelord :Delamination; multilayered packaging; polymer discoloration; plastic film; recycling; Technology and Engineering;

    Sammanfattning : PolyAl, the material composed of laminated polyethylene (PE) films and aluminum (Al) in carton, is a challenge in recycling due to the strong adhesion of the layers and the low value of the end products. In Europe, recent efforts to improve the circularity of carton packages include the chemical separation of PolyAl, in order to obtain higher values of the PE and Al separately. LÄS MER

  3. 2. Nanoprodukter En granskning av nanoprodukter och dess kapacitet att avlägsna mögelmissfärgningar

    Kandidat-uppsats, Göteborgs universitet/Institutionen för kulturvård

    Författare :Matilda Thorlund Brönmark; [2013-07-03]
    Nyckelord :Nano; emulsions; distemper; painting; mold; mural;

    Sammanfattning : This report has explored the use of nanoparticles, micro-emulsions and chemical gels as advanced systems for extracting discoloration from mold on mural paintings. The purpose is to investigate the cleaning results and to compare them with the commonly used techniques used for the same purpose by practising conservator-restorers in Sweden. LÄS MER

  4. 3. Chemical Modification of NFC: Development of Renewable Barriers for Packaging Applications

    Uppsats för yrkesexamina på avancerad nivå, KTH/Skolan för kemivetenskap (CHE)

    Författare :Jesper Pettersson; [2012]
    Nyckelord :Packaging; nanofibrillated cellulose NFC ; polymer modification; grafting; biocomposite;

    Sammanfattning : Globalization and centralization have resulted in prolonged transportation time between producer and consumer, and thus put more demand on the perseveration of a product for longer duration and protect it from oxidation. The presence of oxygen in packages severely foreshortens the storage life as it yield losses of nutrients and allow microbial growth, which can cause changes in smell, taste as well as discoloration. LÄS MER