Method for producing an optimised loose insulating material, and insulating structure comprising such a material

A bio-based insulation process using shredded cereal straw and cellulose wadding with fire retardants addresses thermal and fire resistance issues, achieving high-performance insulation suitable for existing equipment and structures.

EP4555139B1Active Publication Date: 2026-07-01CIBB (CONSTRUCTION INNOVATION BOIS BETON)
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Patent Information

Application Number
EP2023741055
Authority / Receiving Office
EP · EP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2022-07-13
Filing Date
2023-07-12
Publication Date
2026-07-01
Estimated Expiration
2043-07-12

AI Technical Summary

Technical Problem

Existing loose-fill insulation materials, particularly mineral wool and cellulose wadding, lack sufficient thermal insulation in summer, have a high carbon footprint due to non-bio-based fire-resistant additives, and require additional materials for fire resistance, increasing costs and environmental impact.

Method used

A manufacturing process for bulk bio-based insulation using mechanically shredded cereal straw and cellulose wadding, with optional fire retardants, achieving densities between 55 kg/m³ and 65 kg/m³, and incorporating a geopolymer fire retardant, to enhance thermal and acoustic insulation while maintaining eco-friendliness and fire resistance.

Benefits of technology

The process produces an insulation material with superior thermal conductivity (lambda = 0.038 W/mK), excellent homogeneity, and reduced environmental impact, suitable for existing blowing equipment, and provides prefabricated structures with enhanced fire resistance and insulation performance.

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Abstract

The invention relates to a method for producing a loose insulating material based on cereal straw, characterised in that it comprises the steps of: a) shredding the straw to obtain a defibred straw of which the strands have an average length of between 3 mm and 11 mm and of which the average diameter is between 0.5 mm and 2.5 mm; b) using cellulose wadding and untangling and aerating the cellulose wadding; c) mixing the straw defibred in step a) and the cellulose wadding prepared in step b), the cellulose wadding being introduced into the mixer 3 before the defibred straw, with a proportion by weight of between 1% and 30%; d) injecting compressed air to homogenise the mixture and to obtain a mixture having a density of between 55 kg / m3 and 65 kg / m3; and e) bagging the insulating material thus obtained.
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