Method for dry-forming cellulose products from cellulose fibres in a product forming unit and a product forming unit

EP4688371A1Pending Publication Date: 2026-02-11PULPAC AB
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Patent Information

Application Number
EP2024712420
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-03-28
Filing Date
2024-03-12
Publication Date
2026-02-11

AI Technical Summary

Technical Problem

Current dry-forming methods for cellulose products face challenges in producing deep drawn products at high speeds with high quality due to complex air-forming and handling processes, limiting mechanical strength, flexibility, and precision control.

Method used

A method and product forming unit that uses loose and separated cellulose fibres, transported by air to a shaping element, where they are arranged into a three-dimensional body and compressed into a fibre structure within a forming mould under controlled pressure and temperature, ensuring uniform thickness and efficient deposition.

Benefits of technology

This approach enables the production of high-quality cellulose products at increased rates with improved mechanical properties and precision, specifically suitable for deep drawn products by simplifying fibre handling and ensuring consistent thickness.

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Abstract

A method for dry-forming a cellulose product from cellulose fibres in a product forming unit and product forming unit, where the product forming unit comprises a forming mould (M) comprising a first mould part (3a) and a second mould part (3b), where the first mould part (3a) and / or the second mould part (3b) is configured as a shaping element (2). Loose and separated cellulose fibres are provided and the loose and separated cellulose fibres are fed into a flow of air for transporting the cellulose fibres to the at least one shaping element by means of the flow of air as carrying medium for the cellulose fibres; arranging the loose and separated cellulose fibres onto a three-dimensional surface of the at least one shaping element by means of the flow of air for forming at least one three-dimensional body of cellulose fibres; dry-forming the cellulose product into a three-dimensional compressed fibre structure by pressing and heating at least one three-dimensional body of cellulose fibres in a forming mould with a forming pressure in the range of 1-600 MPa, and with a forming temperature in the range of 60-300 °C.
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