The Effect of Full-Cell Impregnation of Pine Wood (Pinus sylvestris L.) on Changes in Electrical Resistance and on the Accuracy of Moisture Content Measurement Using Resistance Meters

Konopka, A.; Barański, Jacek; Orłowski, Kazimierz A.; Szymanowski, Karol

doi:10.15376/biores.13.1.1360-1371

Cited by 12 publications

(9 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A non-complete list of state-of-the-art methods shall be mentioned here. The effect of wood preservative, often containing salts originating from copper for impregnation is known to affect the electrical properties of wood [ 13 ]. An impregnation process was also used by Trey et al [ 14 ] to impregnate the lumen of wood with an intrinsically conductive polymer.…”

Section: Introductionmentioning

confidence: 99%

Development of an Electrically Conductive MDF Panel—Evaluation of Carbon Content and Resin Type

2023

View full text Add to dashboard Cite

Electronics in furniture and construction materials, in particular technologies which allow for a flexible and cable-free connection of electronics in such materials, are gaining broader interest. This study shows a further development of a concept to obtain highly conductive medium-density fibreboard panels (MDF) for furniture application. MDF were produced using two mixing processes (wet and dry) for wood and carbon fibres to investigate the effects of resin type (urea formaldehyde (UF) and polymeric methylene diphenyl diisocyanate (pMDI)) and carbon fibre content on their mechanical, physical, and electrical properties. Overall, wet mixed fibres showed better electrical but reduced mechanical properties. Modulus of elasticity (MOE) and bending strength (MOR) values of 3500 MPa and 35 MPa, respectively, and internal bond (IB) values of 0.45 to 0.65 MPa with electrical conductivities of up to 230 S/m were achieved. The technology has been successfully implemented in a demonstration object showing the application in a small piece of furniture.

show abstract

Section: Introductionmentioning

confidence: 99%

Development of an Electrically Conductive MDF Panel—Evaluation of Carbon Content and Resin Type

2023

View full text Add to dashboard Cite

show abstract

“…Research made on impregnated pine (Konopka et al 2018) showed that the electrical resistance of wood might be lowered by the impregnation agent. Adanur et al (2017) studied the influence of borax and boric acids on oriental beech.…”

Section: Introductionmentioning

confidence: 99%

Cutting model parameters from frame sawing of natural and impregnated Scots pine (Pinus sylvestris L.)

et al. 2020

View full text Add to dashboard Cite

In this paper, absolute and density normalized cutting model parameters of natural and impregnated Scots pine (Pinus sylvestris L.) are shown and a method for the calculation of their corresponding material properties in the principal material directions of wood is presented. The parameters were determined from measurements of cutting power on a sash gang saw, and are in detail the fracture toughness and the shear yield strength of wood. The cutting model used for fitting the data and calculating the parameters is based on a minimum energy criterion originally developed to describe an orthogonal single tooth cutting process where the chip of an isotropic material is built by shear. The effects of impregnation on wood are clearly visible in cutting power and model parameters, where for large chips less power is required compared to natural wood. Impregnated pine wood shows a reduced value of shear yield strength compared to natural pine whilst the correlated fracture toughness increased. The observed behavior might be explained by a lower moisture content of the impregnated pine compared to natural wood. Orthotropic fracture toughness and shear yield strength constants of natural and impregnated Scots pine might be used to predict cutting power for other cutting geometries and processes like circular sawing.

show abstract

“…Applied voltage, orientation and frequency of the electric field with respect to the structure, temperature, air humidity, and frequency at determination also play an important role (Torgovnikov 1992;Olmi et al 2010;Daian et al 2005;Bogosanovic et al 2010;Brischke and Lampen 2014). The conductivity and dielectric properties of wood increase with increasing amount of water in wood (Kabir et al 1998;Sahin and Ay 2004;Şahin Kol 2009;Konopka et al 2018), which varies greatly especially below fiber saturation point (Romanov 2006;Otten et al 2017).…”

Section: Introductionmentioning

confidence: 99%

“…In this manner, common availability, low cost, simple preparation and application process of NaCl aqueous solution exhibit a good potential for further research. Depending on the concentration and properties of salt solution, it significantly influences the MC of wood in the upper hygroscopic region (relative humidity = above 75%), where it starts to absorb airborne water (Hertel 1997;Pařil and Dejmal 2014;Konopka et al 2018;Pouzet et al 2019). During modification of wood with NaCl, its solution penetrates in wood very well and NaCl can crystallize in wood after drying, while the adsorbed and free water present in wood works as a solvent for NaCl (Lesar et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Dielectric and surface properties of wood modified with NaCl aqueous solutions and treated with FE-DBD atmospheric plasma

2021

View full text Add to dashboard Cite

The hygroscopic and electrical properties of the wood surface of Norway spruce (Picea abies (L.) Karst.) and common beech (Fagus sylvatica L.) were altered by the application of differently concentrated NaCl aqueous solutions. The presence of Na+ and Cl– ions increased the equilibrium moisture content in both woods in environments with a relative humidity of 75% to a nearly saturated state. The electrical resistance of the wood decreased, while the electrical capacitance of the wood increased with increasing amounts of NaCl introduced. Inverse trends were observed for both properties in wood modified with the two most concentrated solutions (18 and 36% molality). Microscopic analysis of the outer layers of the wood samples using scanning electron microscopy and energy-dispersive X-ray spectroscopy showed that the amount of NaCl decreased linearly up to about 1 mm from the modified surface. The presence of Na+ and Cl– ions in wood increased the intensity and improved the homogeneity of the plasma discharge generated during treatment of samples in air at atmospheric pressure. Both modification of wood with NaCl and subsequent treatment with plasma increased the surface roughness of the substrates. Finally, it was shown that the wettability of wood with a waterborne coating was improved after plasma treatment, regardless of the presence of NaCl on the surface. These findings have a good potential not only for the study of surface treatment processes of wood with plasma discharges, but also for other technical applications of lignocellulosic materials.

show abstract

The Effect of Full-Cell Impregnation of Pine Wood (Pinus sylvestris L.) on Changes in Electrical Resistance and on the Accuracy of Moisture Content Measurement Using Resistance Meters

Cited by 12 publications

References 9 publications

Development of an Electrically Conductive MDF Panel—Evaluation of Carbon Content and Resin Type

Development of an Electrically Conductive MDF Panel—Evaluation of Carbon Content and Resin Type

Cutting model parameters from frame sawing of natural and impregnated Scots pine (Pinus sylvestris L.)

Dielectric and surface properties of wood modified with NaCl aqueous solutions and treated with FE-DBD atmospheric plasma

Contact Info

Product

Resources

About