scholarly journals THEORETICAL ASPECTS OF THE DISPOSAL OF WOOD FIBER WASTE IN AERODYNAMIC MEDIA

2020 ◽  
pp. 475-484
Author(s):  
Natal'ya Geral'dovna Chistova ◽  
Venera Nurullovna Matygulina
Keyword(s):  
Specific Surface ◽  
Technological Process ◽  
Wood Fiber ◽  
Mechanical Effect ◽  
Chemical Additives ◽  
Grinding Method ◽  
Dry Grinding ◽  
Secondary Wood ◽  
Environmental Feasibility ◽  
Physical Phenomena

The paper discusses the results of a study on the use of fundamentally new equipment (rotary knife mill) for the preparation of secondary fiber waste in the air and the possibility of their full use in finished products for various purposes. In order to justify the effectiveness of the preparation and the feasibility of using secondary wood fiber semi-finished products by a dry grinding method, the physical phenomena and regularities of the mechanism for the preparation of secondary wood fiber semi-finished products by the proposed method are determined and investigated, which characterize the technological process of preparation in air and their possible future use as semi-finished products or in the manufacture of finished products products. The process of dissolution of wood fiber waste was studied, the mechanical effect on wood fiber waste due to face-cross cutting (cutting, crushing, flattening, breaking) and aerodynamic phenomena (breaking, collision, dissolution, fibrillation), contributing to the formation of external and internal fibrillation of the secondary wood fiber, is described. increase in specific surface in the absence of high temperatures and pressure, without the addition of chemical additives, without the use of water and steam. The performed studies allow us to propose a new method and system for the preparation of wood fiber waste by dry grinding, justifying their economic and environmental feasibility.

Dry grinding of waste wood fiberboard: Theoretical and practical aspects affecting the resulting fiber quality

BioResources ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. 8152-8171
Author(s):  
Venera Matygulina ◽  
Natalya Chistova ◽  
Aleksandr Vititnev ◽  
Roman Chistov
Keyword(s):  
Fiber Quality ◽  
Economic Feasibility ◽  
Wood Fibre ◽  
Design Parameters ◽  
Processing Conditions ◽  
Plant Design ◽  
Chemical Additives ◽  
Dry Processing ◽  
Dry Grinding ◽  
Secondary Wood

This paper presents the results of research on the treatment of secondary wood fibre semi-finished materials using a dry-grinding-type rotary cutting mill and the possibility of their use in finished products for various purposes. The physical phenomena, processes, and regularities of the treatment of secondary wood fibre materials in dry processing conditions were determined and evaluated. The influence of grinding plant design parameters on wood fibre quality indices was evaluated. Mechanical effects on wood fibre waste of face-cross cutting (cutting, crumpling, collapsing, and breaking) and the dry grinding environment (breaking, collision, defibering, and fibrillation) was studied. These phenomena contribute to the formation of external and internal fibrillation of secondary wood fibre and an increase in the specific surface area. This is achieved in the absence of high temperatures and pressure, in the absence of chemical additives, and without the application of water and vapour. The effectiveness of secondary wood fibre semi-finished material treatment was demonstrated under dry processing conditions, thus confirming the environmental and economic feasibility of this method.

Experimental Study on the Applicability of Minimum Quantity Lubricant Grinding

2010 ◽  
Vol 139-141 ◽  
pp. 1378-1383 ◽  
Author(s):  
Guang Yao Meng ◽  
Ji Wen Tan ◽  
Yi Cui
Keyword(s):  
High Speed ◽  
Green Manufacturing ◽  
Gas Barrier ◽  
Minimum Quantity ◽  
Mql Grinding ◽  
Grinding Method ◽  
Grinding Fluid ◽  
Dry Grinding ◽  
Fluid Supply ◽  
Minimum Quantity Lubricant

Grinding is often to use the grinding fluid because of the high temperature in the grinding area. During the process of grinding, which is used traditional way of grinding fluid supply, gas barrier layer which around high-speed rotary wheel impeded effective grinding fluid into grinding zone, so it creates huge waste and pollution. Minimum quantity lubricant (MQL) grinding as a way of Green Manufacturing is proposed in recent years. So far, the problem of MQL can be applied in grinding has not been confirmed. In this paper, the applicability of MQL in grinding is studied by comparing the experiment of traditional grinding fluid supply method, minimum quantity lubricant grinding method and dry grinding method, and this study is based on theoretical analysis of minimum quantity lubricant grinding.

Micromorphology and Macromorphology of Recycled Fiber and Wood

MRS Bulletin ◽  
1994 ◽  
Vol 19 (2) ◽  
pp. 22-29
Author(s):  
Douglas D. Stokke
Keyword(s):  
Materials Science ◽  
Paper Industry ◽  
Wood Fiber ◽  
Morphological Characteristics ◽  
The United States ◽  
Raw Material ◽  
Common Denominator ◽  
Recycled Fiber ◽  
Secondary Wood ◽  
Recycle Rate

The versatility of wood as a raw material is emphasized by the realization that the mass of wood consumed annually in the United States is nearly that of the combined total U.S. consumption of aluminum, plastics, cement, and steel (Figure 1). Partly as a result of the enormous quantities consumed, many wood and paper products also make up significant fractions of the materials disposed in landfills, despite accelerated recycling efforts, notably those of the paper industry. With a target recycle rate of 40% by 1995, the paper industry will make further progress in alleviating some of the disposal problems, but additional efforts to recycle wood and wood-fiber-based materials into other types of products will also be needed. Many of these opportunities have been described. A common denominator in these utilization schemes is to consider how the morphology of secondary wood-based materials may limit their use, and how the morphological characteristics of recycled fiber and wood may influence the properties of the materials produced from them. These considerations suggest, at least partly, a materials science approach to the utilization of recycled fiber and wood, particularly for the fabrication of wood-based composites.

Research and Analysis of Dry Crushed Waste Tire Processing

2011 ◽  
Vol 109 ◽  
pp. 228-231 ◽  
Author(s):  
Jia Yang ◽  
Song Ge Yang ◽  
Li Jun Qiu
Keyword(s):  
Particle Size ◽  
Powder Particle Size ◽  
Main Mode ◽  
Waste Tires ◽  
Waste Tire ◽  
Powder Production ◽  
Wet Grinding ◽  
Grinding Method ◽  
Cryogenic Grinding ◽  
Dry Grinding

For the treatment of waste tires and waste tire reuse has become an important task in today's society. Waste tire processing methods are: restructuring the use of the prototype. Energy use of waste tires as fuel will use high-temperature heating with thermal decomposition of waste tires, to promote its decomposition into oil, combustible gas, carbon. Scrap tire retreading. Powder production and other means. By mechanical means will be used after the tire tread and some other parts of the split will be obtained after crushing the powder material is powder. Currently the main mode of production has powder dry grinding, cryogenic grinding and wet grinding method. Different methods produce different particle size range of powder, powder surface morphology is also different. Dry grinding, wet grinding and cryogenic grinding of the legal system into a powder particle size in the range of 0.3 mm ~ 1.5 mm, 0.075 mm ~ 0.3 mm and 0.075 mm or less. Dry grinding method because of his production and processing simple process has been widely used in powder production process. For dry grinding process and mechanical work made for the research and analysis.

scholarly journals Energy Consumption for Acceleration of the Upper Parts of Plants in the Interval between the Belt of the Upper Conveyor and the Deck

2020 ◽  
pp. 76-79
Author(s):  
В.А. Николаев ◽  
В.В. Гумённый
Keyword(s):  
Energy Consumption ◽  
Power Consumption ◽  
Technological Process ◽  
Angular Acceleration ◽  
Animal Husbandry ◽  
Energy Costs ◽  
Design Version ◽  
Grinding Method ◽  
Combine Harvesters ◽  
Required Quality

Задачей любого технологического процесса является выполнение заданной работы с необходимым качеством и наименьшими затратами энергии. При уборке зерновых культур зерноуборочными комбайнами наибольшие затраты энергии связаны с выделением зёрен из колосьев. Это обусловлено необходимостью протаскивания соломы через молотильное устройство. Чтобы выделить зёрна из колосьев методом вытирания, необходимо срезать только верхние части растений. Оставшиеся стебли соломы следует измельчать и, в зависимости от технологии, либо рассеивать по полю, либо погружать в транспортные средства для использования в животноводстве. Существуют два варианта исполнения устройства для извлечения зёрен из колосьев: с декой, совершающей колебания, и с неподвижной декой. Извлечение зёрен из колосьев методом вытирания, когда дека неподвижна, является энергетически более целесообразным в сравнении с вариантом конструктивного исполнения комбайна, у которого дека совершает колебания. После попадания верхней части растения в промежуток между лентой верхнего транспортёра и декой происходит её линейное и угловое ускорение. Как на линейное, так и на угловое ускорение верхней части растения расходуется энергия. В результате расчётов определена энергия, необходимая для ускорения верхних частей растений, расположенных на деке, и потребляемая мощность. The task of any technological process is to perform the specified work with the required quality and the lowest energy consumption. When harvesting grain crops with combine harvesters, the greatest energy costs are associated with the extract of grains from ears. This is due to the need to pull straw through the threshing device. To extract grains from ears by grinding, it is necessary to cut only the upper parts of plants. The remaining straw stems should be ground and depending on the technology either scattered across the field or loaded in vehicles for use in animal husbandry. There are two versions of the device for extracting grains from ears: with a deck making vibrations, and with a fixed deck. The extraction of grains from the ears by the grinding method when the deck is stationary is energetically more expedient compared to the design version of the combine in which the deck oscillates. After the upper part of the plant enters the gap between the belt of the upper conveyor and the deck its linear and angular acceleration occurs. Both linear and angular acceleration of the upper part of the plant consumes energy. As a result of the calculations, the energy necessary to accelerate the upper parts of plants located on the deck and the power consumption were determined.

Effects of dry grinding on pyrophyllite

Clay Minerals ◽  
1988 ◽  
Vol 23 (4) ◽  
pp. 399-410 ◽  
Author(s):  
J. L. Pérez-Rodríguez ◽  
L. Madrid Sánchez del Villar ◽  
P.J. Sánchez-Soto
Keyword(s):  
Electron Microscopy ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Grinding Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dry Grinding ◽  
Scanning Electron ◽  
Area Data

AbstractDry grinding of pyrophyllite (Hillsboro, USA) has been studied by X-ray diffraction (XRD), specific surface area measurements (BET) and scanning electron microscopy (SEM). At the beginning of the grinding process, some effects such as delamination, gliding and folding of the layers, and decrease in particle size were detected by SEM and XRD, resulting in a large increase in specific surface area, up to a maximum of ∼60 m2·g−1. Marked changes in the structure take place between 30 and 32 mins grinding. Longer grinding times increase the degree of disorder and SEM and specific surface area data suggest that aggregation occurs. XRD results indicate that some residual order persists in the degraded structure.

tudy of the properties of the wood fiber board’s modified by a petro polymer resin

2015 ◽  
Vol 5 (2) ◽  
pp. 120-131
Author(s):  
Вострикова ◽  
Galina Vostrikova ◽  
Филимонова ◽  
Olga Filimonova ◽  
Никулина ◽  
...  
Keyword(s):  
Technological Process ◽  
Wood Fiber ◽  
Latin Square ◽  
Planning Method ◽  
Thermal Hardening ◽  
Experimental Planning ◽  
Polymer Resin

A technology for the modifying treatment of the wood fiber boards (WFB) by a solution of a petropolymer resin obtained from C9-fraction is considered. The technological process of modification of WFB included a number of operations on samples preparation, impregnation in a modifying composition and thermal hardening of the prepared composites. The process of the WFB modification was studied applying an experimental planning method based on a scheme of the greek-latin square of the forth order.

Alteration of imogolite by dry grinding

Clay Minerals ◽  
1981 ◽  
Vol 16 (2) ◽  
pp. 139-149 ◽  
Author(s):  
Teruo Henmi ◽  
Naganori Yoshinaga
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Layer Silicate ◽  
Oh Groups ◽  
X Ray ◽  
Dry Grinding ◽  
Structure Morphology ◽  
Complete Breakdown ◽  
Water Holding

AbstractThe effects of dry grinding on the structure, morphology and properties of imogolite have been investigated by means of X-ray powder diffraction analysis, IR, DTA, and measurements of CEC and specific surface area. Imogolite is very susceptible to alteration by grinding compared to layer silicate minerals such as halloysite, kaolinite and montmorillonite. In the earlier stages of grinding, the parallel array of imogolite tubular structure units is markedly disturbed. On further grinding, disruption of Si-O-Al linkages, polymerization of the silica component released and loss of structural OH groups proceed simultaneously, these changes eventually resulting in complete breakdown of the structure. Ground imogolite is reaggregated finally into granular particles of irregular shape. All these changes are associated with a decrease in water holding capacity, CEC and specific surface area.

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