公开(公告)号：WO2017137879A1

公开(公告)日：2017-08-17

申请号：PCT/IB2017/050629

申请日：2017-02-06

Applicant: STORA ENSO OYJ

Inventor： RÄSÄNEN, Jari ,  HILTUNEN, Mari ,  HARLIN, Ali ,  KOSKELA, Hanna ,  LAINE, Christiane ,  KELA, Laura

IPC: C08J9/16 ,  B32B5/20 ,  B32B27/10 ,  B65D1/34 ,  C08J9/22 ,  D21H17/33 ,  D21H21/56

CPC classification number: B32B5/20 ,  B32B27/10 ,  B65D1/34 ,  D21F11/00 ,  D21F11/002 ,  D21H17/33 ,  D21H19/84 ,  D21H21/56

Abstract: The invention concerns a method of manufacturing paper or board, the paper or board obtained by the method, and a method of producing a tray from the board. In a fibrous stock for papermaking is incorporated an amount of polymer coated fibrous particles, which even have a foaming agent such as moisture contained therein. A web is formed from the fibrous stock on a forming fabric of a paper or board machine, followed by pressing and drying to a finished paper or board. As the paper or board is sufficiently heated the foaming agent within the particles evaporates, causing expansion and foaming of the polymer coating, which adds to malleability of the board as it is moulded into a shaped article such as a board tray. The invention even covers production of doubly coated fibrous particles for use in said methods, the inner coating layer being of a foamable polymer with a higher melt flow rate and the outer coating layer being of a non-foaming polymer of a lower melt flow rate.

Abstract translation: 本发明涉及一种制造纸或纸板的方法，通过该方法获得的纸或纸板以及由该纸板制造托盘的方法。 在用于造纸的纤维材料中掺入一定量的聚合物涂覆的纤维颗粒，其甚至具有包含在其中的发泡剂如水分。 纸幅由纸或纸板机的成形织物上的纤维原料形成，然后压制并干燥成成品纸或纸板。 当纸或纸板被充分加热时，颗粒内的发泡剂蒸发，引起聚合物涂层的膨胀和起泡，这增加了板被塑造成成型制品例如板托盘时的延展性。 本发明甚至涵盖用于所述方法的双包覆纤维颗粒的生产，内包覆层是具有较高熔体流动速率的可发泡聚合物并且外包覆层是具有较低熔体流动速率的非发泡聚合物。