Teknologian Tutkimuskeskus Vtt Oy

Jani Lehmonen

Tuomo Hjelt

Riku Pihko

Kay Rökman

Karita Kinnunen

Karita Kinnunen-Raudaskoski

Kirsi Immonen

Antti Ojala

Hannu Minkkinen

Kalle Ilmari Nättinen

Kalle Nättinen

Lisa Wikström

Petri Jetsu

Ari Erkkilä

Ari Erkkila

According to an example aspect of the present invention, there is provided a method for foam assisted drying of nano- and microfibrillated cellulose, which is easily up-scalable and cost-efficient.

Foam assisted drying process of nano- and microfibrillated cellulose

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&#xb0; C. on at least one surface of the elongated product.

Method and apparatus for producing a fiber web

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.

Method and apparatus for producing a fibre web

The present invention concerns a process for producing a thermoformable porous web using a mixture of cellulosic fibers and one or more thermoplastic materials, particularly by foam forming said mixture into a composite foam, and applying the foam into one or more layers on a support to obtain a porous pre-form web. The thus produced porous composite web can be further processed by compression molding to give a rigid high-strength composite structure, which is suitable for use in producing, e.g. panels or plates, packages or hygiene products, insulators or filters, or printed intelligence, electronics or microcellulose products.

Production of high performance thermoplastic composites

Growing community of inventors

Jyväskylä, Finland

Jani Lehmonen