Applied Wood Science & Technology - Dr. Oliver Kläusler

The core activity of the group “Applied Wood Science and Technology” is the wood related technology transfer from science into practice.

New technological approaches have to go a long way before they can successfully be implemented into the environment of private enterprises. Moreover, this is just the first stage of a challenging process, which finally leads to the market entry of a new product.

We are dedicated to developing new concepts for coping with new wood related technological challenges. This also comprises the upscaling of innovative processes from lab scale to pilot scale as well as the accordant ramp-up support on-site.

As a cornerstone of our work, we foster a reliable cooperation with partners from private enterprises, scientific institutions, foundations and associations. This allows for providing essential expertise in all stages of the innovation process, from basic ideas to final product optimizations.

Enlarged view: Applied wood science and technology product processing scheme; Oliver Klauser
Product processing scheme  

During this process several optimization loops should be taken into account, since creative processes hardly ever go linear. This accounts for incremental innovations as well as for radical ones. However, the second and most important cornerstone of our group is the complementary experience of the group members in their specific fields.

Currently we run various projects which are funded by CTI, Gebert Rüf Foundation, and SEED or via direct financial contributions from private enterprises.

Our core fields of expertise

1) Adhesive bonding

  • Various bonding systems and adhesion promoters
  • Characterization of interactions between adherend and adhesive polymer
  • Mechanical testing of polymer films or bonded samples under varied ambient conditions
  • Manufacturing and characterization of adhesive polymer films
Enlarged view: Applied wood science and technology stress strain charts of adhesive polymer films; Oliver Klauser
Stress-strain charts of adhesive polymer films under varied ambient moisture conditions [Kläusler et al. 2013]
Enlarged view: Applied wood science and technology wood adhesive interactions and fracture behavior; Philipp Hass
Wood adhesive interactions and fracture behavior of bonded wood [Hass 2011]

No database information available

2) Physical characterization techniques

  • Sorption/desorption (DVS, climate chambers)
  • Diffusion (dry cup / wet cup)
  • Heat conduction (incl. thermal diffusivity and heat capacity)
  • Thermo-gravimetric analysis
  • Contact angle measurements
  •  Nondestructive testing (Ultrasound, eigenfrequency, etc.)
  • DSC (determination of TG)
  • Single-flame burning test
  • Color measurements
  • Artificial weathering (QUV, UV)
Enlarged view: Applied wood science and technology adsorption and desorption isotherms; Walter Sonderegger
Adsorption and Desorption isotherms of specific wood based insulating materials [Sonderegger 2010]

No database information available

3) Mechanical testing by means of universal testing machines

  • Universal testing machines for standard testing protocols and modified testing procedures
  • Micro tensile stage

4) Microscopy techniques

  • ESEM, SEM / EDX
  • Reflected-light and transmitted-light microscopy
  • AFM
Enlarged view: Applied wood science and technology ESEM image of adhesively bonded beech wood; Oliver Klauser
ESEM image of adhesively bonded Beech wood (Fagus sylvatica L.), RT plane, after shear testing at wet state: Left: former glued joint (GJ) and fracture path (FP); Right: glued joint with adhesion promoter (WR = wood ray) [Kläusler et al. 2014]

5) Chemical characterization techniques

  • Spectroscopic techniques (FTIR, UV, Raman)
  • Wet chemistry
Enlarged view: Applied wood science and technology, IR-ATR spectrum of a fluid 1C-PUR; Oliver Klauser
IR-ATR spectrum of a fluid 1C-PUR droplet during hardening. Blue spectrum collected after 10 minutes, red spectrum collected after 24h (NCO-groups ascribed to wavenumber 2275cm-1) [Kläusler et al. 2014]
Applied wood science and technology, spectroscopy combined with microscopy; Oliver Klauser
Chemical imaging (spectroscopy combined with microscopy) of 1C PUR bonded beech wood (Fagus sylvatica L.), RT plane: Bulk adhesive (red), bulk wood (blue), mixed zones (green) [Kläusler et al. 2014]

6) Processing technology

  • Adaptation of devices and processes within the scope of upscaling processes
  • Development of concepts and processes in consideration with new technical standards and environmental regulations
  • Design of pilot processes for physical or chemical wood modification
Enlarged view: Applied wood science and technology, processing technology; Oliver Klauser
Processing technology scheme
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