Stora Enso Oyj

Mari Hiltunen

Jari Räsänen

Kimmo Nevalainen

Outi Kylliäinen

Panu Tanninen

Niilo Pöyhönen

Sami Matthews

Henry Lindell

Isto Heiskanen

Ali Harlin

Ville Ribu

Christiane Laine

Nina Ruohoniemi

Titta Lammi

Laura Kela

Hanna Koskela

Tim Lindfors

Outi Kyllianen

The present invention relates to a web of fibrous cellulosic material derived from wood pulp, said web being suitable for three-dimensional moulding to form a packaging product, wherein the web comprises >40 wt % of soft wood chemical pulp and at least one strength enhancement agent, wherein the web has a grammage less than 400 g/m, and wherein the cellulose fibers of said soft wood chemical pulp comprise a fiber curl of >9%.

Mouldable fibrous sheet and a production method thereof

The invention relates to a method and an apparatus for deep-drawing a tray () from fiber-based sheet material (), such as polymer coated board. The apparatus comprises a female moulding tool (), which comprises a cavity () for forming the tray bottom outwardly, a male moulding tool (), which comprises a plunger plate () for forming the tray bottom inwardly, the plunger plate being movable with respect to the cavity for forming the tray, and clamps () with an interface for holding the sheet material and forming a tray rim flange. According to the invention by laterally distancing at least one of the moulding tools () from the sheet material leeway is provided for free forming of the tray side walls while wrinkling or tearing of the same is avoided. Spacer plates () may be positioned behind the plunger plate (), to adjust its position in relation to the cavity () of the female moulding tool (). The cavity may have a separate bottom plate () and spacer plates () there below, or screw means may be provided for adjusting the distance of the bottom of the cavity from the clamp interface and thereby varying the depth of the tray.

Method and apparatus for deep-drawing a tray from sheet material

A deep-drawn paper tray made of paper material, a method and an apparatus for manufacturing the tray, and a closed product package comprising the tray. The tray having a bottom and upwardly expanding side walls around the bottom, the side walls of the tray being shaped to expand through a plurality of circumferential steps dimensioned low enough for obtaining wrinkle-free side walls for the tray. The outermost step is a flat, wrinkle-free rim flange, which enables liquid and gas proof heat-sealing of a lid to form the package. The apparatus may comprise upper and lower moulding tools with concentric movable frames for forming the tray bottom and side wall steps from paper blanks, and moulding tools may be mounted onto a rotating turret carrying a paper blank through working stations arranged along the turret circumference, to shape the tray bottom and the side wall steps at the consecutive stations.

Deep-drawn paper tray, a method and an apparatus for making it, and a tray-formed product package

The invention relates to a method and an apparatus for deep-drawing a tray () from a blank of sheet material (). The blank is provided with score lines, which determine the location of wrinkles formed in the process. The apparatus comprises a female moulding tool (), which comprises a cavity () for forming the tray bottom outwardly, a male moulding tool (), which comprises a plunger () for forming the tray bottom inwardly, the plunger being movable with respect to the cavity for forming the tray, and clamps () with an interface for holding the sheet material and forming a tray rim flange. According to the invention by laterally distancing at least one of the moulding tools () from the sheet material leeway is pro-vided for free forming so that wrinkling of the tray side walls is achieved in a controlled manner. Spacer plates () may be positioned behind the plunger (), to adjust its position in relation to the cavity () of the female moulding tool (). The cavity may have a separate bottom plate () and spacer plates () therebelow, or screw means may be provided for adjusting the distance of the bottom of the cavity from the clamp interface and thereby varying the depth of the tray.

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.

Methods for making paper or board, a board tray and pulp particles coated with foamable polymer for use in the same

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Imatra, Finland

Mari Hiltunen