Sökning: "stratified headbox"

Hittade 2 uppsatser innehållade orden stratified headbox.

1. 1. Influence of hardwood, softwoodand fractionated pulp in a stratifiedthree-layered fine paper : Lövved, barrved och fraktionerad massa ochdess inverkan på ett treskiktat finpapper

   Master-uppsats, Grafisk teknik

   Författare :Mariell Mattison; [2006]
   Nyckelord :Multi-ply fine paper; three-layer fine paper; stratified forming; simultaneous forming; XPM; Formator; StratEx; AQ-vane; stratified headbox; early wood; late wood; fractionation; fine fraction; coarse fraction; hydrocyclone;

   Sammanfattning : Four different trials of stratified three-layered fine paper, of sulphate pulp, were performed to investigate if stratified fine fraction or fibres from birch can improve the properties of a paper compared to a reference sheet. All trials had five different scenarios and each scenario was calendered with different linear load. LÄS MER

3. 2. Flerskiktat papper : en sammanställning av historia, teknik och forskningsresultat

   Kandidat-uppsats, Grafisk teknik

   Författare :Mariell Mattison; [2005]
   Nyckelord :flerskiktat papper; samformning; separat formning; fraktionering; inloppslåda; AQ-vanes; Airwedge technology; pappersmaskin;

   Sammanfattning : Until the beginning of the 1900:th century the paper making process was handicraft. The paper machines that have been developed since then are as impressing in size as fascinating when it comes to the technique. The process has always been improved to give a better paper for lower costs, with as short manufacture time as possible. LÄS MER