in this research, effect of using hornbeam and beech branch woods in admixture with birch stem wood on their cmp pulp properties. using percentage of branch woods, with 20% constant content for birch stem wood, were 0, 16, 40, 56 and 80 in final mixture of hardwoods. the results indicated that cooking time, to reach 85% yield and under same cooking condition, and also refining quantity, to reac...

A pilot study was conducted within the Ontario sawmill and veneer/plywood manufacturing industry. Information was collected by postal questionnaire and observational walk-through surveys. Industrial hygiene walk-through surveys were conducted at 22 work sites, and measurements for wood dust, noise, and bioaerosol were taken. The aim of the study was to obtain data on the current status regardin...

The influence of extractive content on the thermal stability and kinetic degradation of two wood species has been investigated using chemical analysis and thermogravimetry. Two wood species were studied: Pinus taeda and Eucalyptus grandis. Thermogravimetric results showed that higher extractive contents in the wood accelerate the degradation process and promote an increase in the conversion val...

[1] Wood smoke in the atmosphere often accounts for 20–30% of the ambient fineparticle concentrations. In communities where wood is burned for home heating, wood smoke can at times contribute the majority of the atmospheric fine-particle burden. Chemical mass balance receptor models that use organic compounds as tracers can be used to determine the contributions of different emission sources, i...

Solvents are widely used in wood conservation for either dissolving polymers for consolidation purposes or for removing dirt or foreign matter, which was applied during previous conservation. Solvents may cause temporary swelling of the wood, and when they evaporate wood returns back to its original size. They may form complexes with wood components when unlimited swelling arises as a consequen...

address to increasing demand for wood products and limited domestic resources, wood and wood products imports as one of the easily available and widespread ways in international context, is very important. among the policy on the imported wood market that is evident, apply a tariff and non-tariff barriers. know the reaction importers against the change priced is important to be determined and a...

Whatever the species considered, trees reorient their axis by a very active mechanical action driven by variations of cambial activity. These variations of cambial activity will lead to variations in anatomy and ultrastructure of the xylem to achieve this biomechanical function, forming a type of wood called reaction wood, i.e. tension wood in angiosperms and compression wood in gymnosperms. Th...

Exposure to wood dust, a human carcinogen, is common in wood-related industries, and millions of workers are occupationally exposed to wood dust worldwide. The comet assay is a rapid, simple, and sensitive method for determining DNA damage. The objective of this study was to investigate the DNA damage associated with occupational exposure to wood dust using the comet assay (peripheral blood sam...

The thermal degradation behavior and pyrolysis kinetic models of wood flour (WF)/PVC composites before and after adding chitosan were studied using thermogravimetry (TGA) and nine common kinetic model functions (f(α)). The results indicated that the thermal degradation temperature of WF/PVC composites was delayed to a higher value after adding chitosan. The first-order reaction order (L1) model...

A 29-year-old healthy Thai female, working as a design and technology teacher,was referred to our clinic because of a 2-month history of recurrent hives over the forearms, face, and neck. She had not experienced symptoms in her job in the 4 years before, until a new wood material, meranti (Shorea species), was introduced to her workshop. She would develop itchy wheals minutes to hours after saw...