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Jaan Kers

Heikko Kallakas / Jaan Kers / Püssa M. / Villu Kukk

Impact of cracks to the hygrothermal performance of cross laminated timber

Cross laminated timber (CLT), also known as “Engineered wood” developed initially in Europe (Switzerland) in early 1990s and it is designed mostly for multistorey buildings as load-bearing elements because of …

Anti Rohumaa / Bankole O.S. / Jaan Kers

Microstructure study of birch false heartwood

The microstructure of birch (Betula pendula) false heartwood, FHW, was studied in comparison with clear birch samples using FTIR spectroscopy and SEM analysis with the aim of determining whether this …

Christian Brischke / Dennis Jones / Heikko Kallakas / Jaan Kers / Miha Humar / Tubli P.

Impregnated wood performance in outdoor environment

This research project is inspired of a COST Action FP 1303 “Performance of bio-based building materials”. The aim of present performance test was to examine the performance data of Norway …

Heikko Kallakas / Horta R. / Jaan Kers / Luciani G.

Air permeability properties of cross laminated timber

The air-tightness of the building components (wall, ceiling and roof) is essential in many aspects as indoor climate, noise, energy balance and structural defects.Inadequate air-tightness has as consequences low thermal …

Jaan Kers / Kiiman K. / Luga Ü.

CNC machining of halftone and litho- phane images into wood-based panels

CNC machining of images into wood-based materials allows production of high value products to be used as decorative elements in interior design.The aim of the current research was to develop …

Jaan Kers / Targo Kalamees / Villu Kukk

The effect of edge bonding and initial moisture content to the properties of cross laminated timber

The main objective of the study was to evaluate the impact of edge bonding technology and different initial moisture content (MC) of lamellas to the air-permeability properties of cross laminated …

Andres Krumme / Gbenga Solomon Ayansola / Heikko Kallakas / Jaan Kers / Martin Moravčík / Triinu Poltimäe

Effect of birch false heartwood on the physical and mechanical properties of wood- plastic composites

False heartwood is a phenomenon where penetration of oxygen discolors the wood. It is an undesirable defect which influences the applications of the wood. The properties and formation of false …

Anti Rohumaa / Harti Vahermets / Heikko Kallakas / Jaan Kers / Triinu Poltimäe

Effect of different wood species and lay-up on the mechanical properties of plywood

Plywood is valued for its uniform strength in all directions. This gives plywood an upper hand against solid wood in terms of cracking and warping. In Estonia, only birch is …

Heikko Kallakas / Jaan Kers / Kevin Visnapuu / Percy Festus Alao / Triinu Poltimäe

Natural weathering of bio-based façade materials

Although the world has come to the realization that exploitation of non-renewable materials are not sustainable, (Petrillo et al, 2018) there has been a limited interest in fully utilizing natural, …

Anti Rohumaa / Jaan Kers / Tolgay Akkurt

The effect of using densified low-quality veneers in plywood production as an alternative to birch plywood production

The growing demand for renewable raw materials, climate change and the sustainability of the circular economy force manufacturers to explore the use of new and underutilized wood species in wood …

Adeniyi Bella / Jaan Kers / Targo Kalamees / Villu Kukk

Air permeability properties of cross-laminated timber envelopes

Airtightness of building envelope has become an important property of building envelope. The building envelope is locally sensitive to exfiltration airflow, as moisture convection could cause a remarkable increase in …

Anti Rohumaa / Heikko Kallakas / Jaan Kers / Natalja Savest / Silvi Treial / Triinu Poltimäe

Aspen plywood bonding characteristics with phenolic adhesives

As most plywood in Northern Europe is produced from either birch or different softwoods, or a combination of them, there is an interest to research other wood species for plywood …

Anti Rohumaa / Heikko Kallakas / Jaan Kers / Percy Festus Alao / Tolgay Akkurt

Effect of Different Hardwood Species and Veneer Thickness on Bending and Density Properties of Plywood

Plywood is one of the most widely used wood-based product in the world and mainly produced from silver birch (Betula pendula Roth) tree. It is constructed by combining layers of …

Jaan Kers / Targo Kalamees / Villu Kukk

The Use of an Internal Airtight Membrane in CLT External Wall in Terms of Hygrothermal Performance

CLT envelope works hygrothermally safe if the panel is not covered by material layers that cause moisture accumulation on the CLT surface, which in turn increases the risk of moisture …

Heikko Kallakas / Jaan Kers / Umair Qasim

Cellulosic Ester Based on the Ionic Liquid-assisted Transesterification: Substitution and Mechanical Analysis

Cellulose, a sustainable material, exhibits excellent properties and can be converted into functional products. Here, the dissolution and transesterification (vinyl laurate) of cellulose has been successfully done in a novel …

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