Property changes in thermo-hydro-mechanical processing

Navi, Parviz; Pizzi, Antonio (2015). Property changes in thermo-hydro-mechanical processing Holzforschung, 69(7), pp. 863-873. De Gruyter 10.1515/hf-2014-0198

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Thermo-hydro-mechanical (THM) treatment is a combined action of temperature, moisture, and mechanical force, which leads to modified wood (THMW). Various types of eco-friendly THM processes have been developed to enhance wood properties and generate new materials, such as welding, densification, molding, bending, profiling, artificial aging, panel manufacture, and surface densification. The various transformation processes in the course of THM bring about positive effects in terms of the mechanical and physical properties as well as the biological durability. To the negative effects belong the loss in strength and fracture toughness, and one of the challenges is to minimize these negative aspects. The present paper reviews the chemical transformations processes during THM treatment in a closed processing system and presents the relationship between processing parameters and THMW properties. The discussion includes the problems associated with eliminating the set recovery of densified wood by THM posttreatments and the chemical origin of the relaxation of internal stresses induced by densification.

Item Type:

Journal Article (Original Article)

Division/Institute:

Architecture, Wood and Civil Engineering

Name:

Navi, Parviz and
Pizzi, Antonio

ISSN:

1437-434X

Publisher:

De Gruyter

Language:

English

Submitter:

Admin import user

Date Deposited:

17 Dec 2019 10:37

Last Modified:

18 Aug 2020 13:05

Publisher DOI:

10.1515/hf-2014-0198

ARBOR DOI:

10.24451/arbor.6096

URI:

https://arbor.bfh.ch/id/eprint/6096

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