A process for foam forming tissue or paper webs is disclosed. A foamed suspension of fibers is deposited onto a forming fabric and contacted with a gas flow prior to drying the web. For instance, the web can contact the gas flow prior to dewatering the web. The gas flow can have a volumetric flow rate and/or a velocity sufficient to rearrange the fibers within the web. In one embodiment, for instance, the gas flow can increase the caliper of the web, the stretch properties of the web, and/or the absorbency characteristics of the web. In one embodiment, the gas flow can be pulsed for producing a web with a distinctive pattern.

A method and system are disclosed for actively cooling a fluid, particularly a foamed fluid. The foamed fluid may comprise a foamed suspension of fibers that is used to form a web. The foamed suspension of fibers is fed around a recirculation loop and actively cooled using a heat exchanger.

An apparatus and a method which heat an elongated product in at least two pulses including at least one first pulse wherein the product is pressed for at least 10 ms on a first pressure and at least one second heating and smoothing pulse wherein the product is pressed and/or heated at least for 10 ms on a pressure that is higher than the first pressure. The heating elements being arranged to heat the elongated product so that the heating the heating temperature is at least 80° C. on at least one surface of the elongated product.

A process and an apparatus for producing nonwoven materials are disclosed. The process comprises the following steps: a) providing a three-phase (gas-liquid-solid) suspension containing air, water, fibrous material and a surfactant, b) depositing the suspension onto a moving carrier sieve to produce a fibrous web on the carrier, c) removing aqueous residue of the suspension through the carrier sieve, d) conveying the aqueous residue through one or more phase separation tanks in an essentially horizontal direction while providing a depressurised headspace above the aqueous residue, e) recycling the aqueous residue conveyed in step d) to step a), f) preferably pre-integrating the fibrous web.

Tissue papers and methods of making are disclosed herein. In one aspect, a tissue paper is substantially free of a chemical debonder and has a geometric mean tensile (GMT) in a range between about 500 and about 5,000 g/3 inches (g/3 in.) and a caliper in a range between about 50 and about 350 mils/8 sheets.

The present invention relates to a new process for creating foam in a process for manufacturing a paper or board product. According to the present invention, certain types of antimicrobial starch is used in the creation of the foam.

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.

According to an example aspect of the present invention, there is provided an apparatus and a method comprising a forming section for feeding an aqueous furnish of fibres on a moving surface to form a shape of a product and a pressing and heating section for removing water from the shaped product received from the moving surface. The pressing and heating section comprises a felt and metal belt that are set to run against each other for receiving the furnish from the moving surface and heating elements for heating the web in at least two pulses including at least one first pulse wherein the product is pressed for at least 10-200 ms on a first pressure and at least one second heating and smoothing pulse wherein the product is heated at least for 10-200 ms on a pressure that is higher than the first pressure, and at least one of the surfaces pressing the product being the smooth metal belt.

The invention discloses a method to enable the efficient use of surfactants in web forming of a cellulose containing material, e.g. in the making of paper or paperboard. The method comprises the addition of microfibrillated cellulose (MFC) or nanocrystalline cellulose (NCC) to the white water in a web-forming process in order to form complexes with surface active agents. The formed complexes are at least partly recycled to the process. This enables the producer to have control over the concentration of surface active agents in the system.

Fiber sheets, structures comprising the fiber sheets and the use of the sheets. The invention further relates to biodegradable and/or recyclable products comprising the fiber sheets, useful in replacing non-biodegradable products.