Change search
ReferencesLink to record
Permanent link

Direct link
New Properties for Wood Products by the Use of Nanosol Technique and Development of a Wood Based Reinforced Composite
2011 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Nanosols are dispersions of nanoparticles in a solvent. They have numerous applications nowadays in a large number of fields. The “New properties for wood products by the use of nanosol technique” project aimed at using the impregnation by nanosols in order to improve both sugar maple and black spruce bulk wood properties for respectively indoor and outdoor furniture applications. A study of the impregnation process efficiency along with the nanosol influence investigation is reported here. Five processes were investigated: vacuum, vacuum-pressure, spray, soaking and roller-coater. The vacuum process exhibited the best penetration depth / cost ratio and was chosen to perform the whole study, along with the roller-coater process that showed good promises in the preliminary study and was the easiest process to implement in a workshop production line. The research routes took then two different ways for each wood specie. Black spruce proved itself as very hard to impregnate, and an alternative impregnation solution including a new microwaving step had to be designed. This step allowed us to improve the impregnation wood intake of up to 33%. A complete range of mechanical tests has been performed on sugar maple to investigate the action of the nanosols. Those tests, related to the furniture industry, were impact tests, hardness tests or pull-off tests. Results showed that the impregnation of maple with well -chosen nanoparticle dispersions can improve the hardness as well as the impact resistance, without damaging the adhesion of the finishing systems with the substrate.This study showed that the nanosol technique is a reliable method to improve wood properties. Further studies are to consider though, regarding the influence of nanosols on environmental attacks on black spruce, and the grafting of the nanoparticles within sugar maple.Baltic birch products are among the leading solutions for high quality flooring in the world. Unfortunately, this specie does not belong to the large range of species available in North America. The goal of the “Development of a wood based reinforced composite” exploratory project was to design a wood based laminate able to compete with the Baltic birch laminates, and made of species or materials easily available in North America. The properties to be investigated in this project were the flexural modulus and the internal bonding of the designed composite.Both HDF and aspen veneer have been used for this study. The addition of reinforcement fibres within the adhesive joint was the studied solution in this project. A broad range of fibres were tried, synthetic ones as well as natural ones. The addition of fibres in accordance to a careful choice of adhesive proved itself as a good solution to improve the composite properties. Flexural modulus were improved of up to 12% for aspen laminates and 81% for HDF laminates, along with a raise of the internal bonding. The optimisation of the pressing process brought these results even higher, reaching 14.5GPa for a 3 layer aspen laminate, compared to an original 10GPa.This exploratory project helped to narrow the range of solutions to compete with Baltic birch products. Further studies should include dimensional stability validation as well as fibre mat density influence investigation.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Nanosol, Aspen, HDF, Spruce, Wood, Reinforcement, Impregnation, Adhesive
Keyword [sv]
URN: urn:nbn:se:ltu:diva-54769Local ID: bb2ade16-527d-4754-9291-885e745fc961OAI: diva2:1028151
Subject / course
Student thesis, at least 30 credits
Educational program
Materials Engineering, master's level
Validerat; 20110310 (anonymous)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

Open Access in DiVA

fulltext(4670 kB)0 downloads
File information
File name FULLTEXT02.pdfFile size 4670 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Amiotte, Camille

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

ReferencesLink to record
Permanent link

Direct link