Nägele

Nägele is one of the two inventors named in the source dossier on Arboform and "liquid wood," paired in the dossier title with Pfitzer. The source URL slug (NagelePfitzerArboformBioplastic) confirms the pairing as the page's organizing identity.

The newly generated version of this page gives the inventor's full name as Helmut Nägele and pairs him throughout with Jürgen Pfitzer. The dossier's page slug, NagelePfitzerArboformBioplastic, and its YouTube entry titled "Helmut Nägele / Jürgen Pfitzer – Arboform Bioplastic" both treat the two as a single inventor pair. Nägele is credited with the development of the lignin-based bioplastic Arboform and with the founding of the spin-off company tecnaro.

What the source supports

The dossier associates the surname Nägele with the development of the lignin-based bioplastic Arboform. Beyond the name and this association, the material available here does not supply a first name, affiliation, biography or a list of specific patents.

The newly generated version reports a fuller set of claims from the same dossier (see below). Where the two versions differ, the distinction is noted: the existing version records only the name and the Arboform association, while the newly generated version adds a first name, dates, affiliations, company and patent identifiers.

Biography as reported

The dossier's Wikipedia component states that Arboform was developed in 1960 by Helmut Nägele and Jürgen Pfitzer at the Fraunhofer Institute for Chemical Technology. In 1998 the two founded the spin-off company Tecnaro. By 2002, Tecnaro was reported to have produced about 300 tonnes of Arboform and to have sold it at roughly $9.5/kg. In 2009, Nägele and Pfitzer received the European Inventor Award for their work on Arboform.

These biographical and historical statements come from a secondary source — the Wikipedia article reproduced in the dossier — and are not corroborated by a primary record within this source text. They are reported here as the source's claims.

The material

Arboform is described in the same source as a thermoplastic composed of lignin (about 30%), cellulose fibers (about 60%) and the remainder natural additives serving as plasticizers, dyes, antioxidants and fillers. It is described as designed to contain no synthetic phases, to have mechanical properties similar to those of polyamide, to be thermally stable up to 95 °C, and to be moldable at temperatures below 160 °C. Because it can be melted and molded, it is also called "liquid wood."

Reported property data attributed to the source include: increasing cellulose content from 30% to 60% raises tensile strength from 9.5 to 14.5 N/mm² and bending stress from about 23 to 39 N/mm², while indentation hardness (about 135 N/mm²) and impact strength (about 3.2 mJ/mm²) remain nearly constant. Other listed values are thermal conductivity 0.38 W/(m·K), electrical resistivity about 5 GOhm, water content 2–8%, and density about 1.4 g/cm³ after molding. The material is sold as pea-sized granules and injection molded at 150–170 °C.

A vendor page reproduced in the dossier adds commercial claims: 100% renewable raw materials, biodegradability, combustion without additional CO₂, weatherproofing, UV resistance, and flame-proofing achievable with additives. These are vendor assertions rather than independent findings; the claim-versus-evidence tension is treated on comparison-arboform-claims-vs-evidence.

Patent filings

The dossier reproduces abstracts for several filings associated with the lignin-based plastic work. Identifiers are preserved verbatim:

• US6509397 — "Plastic material made from a polymer blend." Describes a material containing at least one lignin-based natural polymer, especially based on alkalilignin produced during cellulose extraction, and at least one other synthetic and/or natural polymer that increases impact resistance, proteins excepted. Claims biodegradability from the natural polymer content and a largely ecologically neutral CO₂ balance, and proposes use in place of wood or wood materials.
• US2004012114 — "Method for producing a granulated intermediate product that is to be subjected to a subsequent processing in order to form plastic shaped bodies." Describes mixing a fine-particle thermoplastic or thermoelastic polymer with essentially inert fillers and compacting the powder mixture under mechanical pressure alone, without plasticizing the polymer, to form pourable agglomerates of larger grain size.
• WO2012110237 — "Plasticizable polymer material based on the natural polymers polylactide and/or lignin." Describes a thermoplastic-processible material comprising at least one natural polymer from the group of polylactide and lignin, including mixtures and derivatives, plus at least one polyamide based on dimer fatty acid to improve properties such as impact resistance, together with a molding and a production process using an extruder, plasticizing and homogenizing, discharge, cooling and optional pelletization.
• A further abstract in the dossier describes a polymer-molded part and a production method involving plasticizing and homogenizing a polylactide/lignin mixture with polyamide based on dimer fatty acid, with optional fine particulate solids and natural reinforcing fibers, followed by cooling and granulating.

These are patent filings describing proposed compositions and methods. They are not evidence that the described materials were produced at scale or that the stated properties were achieved.

Limits

This page records only what the dossier supports. First names, institutional affiliations, dates and patent numbers should not be inferred or invented. If further sources establish them, this page can be expanded.

The newly generated version adds that the biographical facts on this page — the 1960 development date, the 1998 founding, the 2002 production and price figures, and the 2009 award — rest on Wikipedia and a 2024 review paper reproduced in the dossier, not on primary documentation. The patent list in the dossier is only partly legible in the available evidence; three identifiers are fully recorded here. No figure or image content accompanies this source.

Related

• Pfitzer — co-named inventor in the same dossier; the newly generated version gives the full name Jürgen Pfitzer.
• Arboform — the material associated with the name.
• Liquid Wood Claim — the claim attached to the material.
• tecnaro — the 1998 spin-off company (newly generated version).
• fraunhofer-institute-for-chemical-technology — the reported development affiliation (newly generated version).
• lignin-based-bioplastic — the material class (newly generated version).
• comparison-arboform-claims-vs-evidence — where vendor claims are weighed against evidence (newly generated version).