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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Pulping characteristics of Douglas-fir sawdusts /

Yang, Tsai-yeong. January 1973 (has links)
Thesis (M.S.)--Oregon State University, 1974. / Typescript (photocopy). Includes bibliographical references. Also available on the World Wide Web.
2

Optimal recovery of resources a case study of wood waste in the greater Sydney region /

Warnken, Matthew January 2004 (has links)
Thesis (Ph. D.)--University of Sydney, 2004. / Title from title screen (viewed 7 May 2008). Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the Dept. of Chemical Engineering, Graduate School of Engineering. Includes bibliographical references. Also available in print form.
3

Distillation of sawdust in a fluidized bed : II. Analysis and Yields

Morgan, Lyman Wallace 08 1900 (has links)
No description available.
4

Ash from homestead fireplaces and wood as possible sources of minerals for livestock

Ndlovu, Hendry.. January 2008 (has links)
Thesis (M. Inst. Agrar.(Animal Production)) -- University of Pretoria, 2007. / Includes bibliographical references. Available on the Internet via the World Wide Web.
5

Recycling veneer-mill residues into engineered products with improved torsional rigidity

McGraw, Brad. January 2009 (has links)
Thesis (M.S.)--West Virginia University, 2009. / Title from document title page. Document formatted into pages; contains xii, 92 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 87-90).
6

Study of corrugated board cutting by high velocity liquid jet

Szymani, Richard January 1970 (has links)
The application of high velocity liquid jets for corrugated board cutting was investigated as a possible new method of slitting operations. Eleven types of corrugated board ranging from 91 pounds per 1,000 square feet board weight (125 psi - nominal burst test) to 297 pounds per 1,000 square feet (350 psi - burst test) were selected for the study. Plain water or water with polymer additive were used as the cutting fluids. The conditions under which cutting of corrugated boards was carried out were as follows: nozzle diameters 0.0082 and 0.0102 in., pressure levels 20,000, 30,000 and 40,000 psi; feed rates 300, 500 and 700 fpm. The obtained results indicate that slitting speeds with high velocity liquid jets are well above those achievable by the existing conventional methods. It has also been shown that the use of a low concentration of polyethylene oxide (Polyox WSR - 301) resulted in a marked increase in cutting efficiency as compared with plain water. Measurements of liquid retention after cutting.-have shown that wetting of corrugated boards during the cutting operation is insignificant and as such can be neglected. It has been demonstrated that the edgewise compression strength of corrugated board, cut with the liquid jet, is almost twice that cut with the typical conventional slitter. Based on the analysis of scanning electron micrographs it has been observed that the principal failure mechanism during cutting with high velocity liquid jet involves breaking of the interfibre bond with resulting separation of fibres. Corrugated board cutting with high velocity liquid jets has been found to eliminate crushing and tearing of the board as well as dust generation. The concept provides a means to reduce trim waste and particle contamination. Jet cutting is ideally suited for numerically controlled systems and appears to lend itself for adaptation to commercial application. / Forestry, Faculty of / Graduate
7

Design and testing of a sawdust dryer and a suspension sawdust burner /

Egolf, Arthur R., January 1992 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaves 78-81). Also available via the Internet.
8

Waste from glued wood - A base for new products and/or bio-fuel?

Bjurman, Therese January 2009 (has links)
<p> </p><p>The Swedwood Company is a supplier to IKEA of wood furniture. They have grown larger concurrently with IKEA and at present they have 47 production units spread over twelve countries of which most are located in Eastern Europe.</p><p>One of the factories is Zbaszynek which is located in Poland. They manufacture so called board-on-frame furniture. A board-on-frame is basically made out of particle board frames which are filled with special design paper that enfolds air. The frames are then covered with their skin; thinner particle boards, so called High Density Fibre (HDF) boards, and then edge banded with plastic stripes and painted and lacquered into desired design.</p><p>This production generates not only furniture, last financial year Zbaszynek generated about 61 000 tons wood waste too. It can be compared to their total production of furniture which reached 439 000 tons during the same period of time. This generation of wood waste has caused a problem for Swedwood in general. A project called IKEA Goes Renewable (IGR) has started within IKEA with the aim to reduce the electric- and heat energy consumption and increase the use of renewable energy sources. But to be able to reduce the heat energy at a board-on-frame factory, such as Zbaszynek, there has to be an economic incentive to do so. But the wood waste is contaminated in comparison with waste from pure wood (free from adhesives, plastics etc.) so purchasers have been hard to find. And since the wood waste is used to generate the heat at the factories, the economic value has become relative low. Zbaszynek earn 1.4 €/MWh for their wood waste at present (energy value of 5.1 MWh/ton), while for example recycled contaminated wood chippings (RT-chippings) are worth about 7.3 €/MWh in Sweden (energy value of 4.4-5.1 MWh/ton). RT-chippings in Sweden are even allowed to contain more contaminations to receive that price, as long as it is not pressure creosoted. 1.4 €/MWh can also be compared to the economic value of coal which is about 13.7 €/MWh, and for district heating to households in Sweden was the average price about 68 €/MWh during 2007 (Energimarknadsinspektionen, 2007).Therefore, the main task of this thesis has been to investigate if there are any possible solutions to increase the economic value of the wood waste in Zbaszynek. There are more board-on-frame factories within Swedwood with the same problem, but Zbaszynek has been the pilot factory during this research.</p><p>The first thing which should be considered in Zbaszynek is to keep the amount of waste as low as possible. The main task should be to reduce the amounts of wood waste; in the end it is a furniture factory and not a waste producer, which should be concerned before taking any further action. It is assumed though that this has already been thought through in Zbaszynek and further investigation of the waste has taken place.The wood waste has been sent to the Eurofins laboratory in Sweden for an analysis and the test results were then compared to wood waste of pure wood. The comparison indicates the nitrogen content being the main difference between Zbaszynek's wood waste and pure wood. Nitrogen compounds, often referred to as NO<sub>x</sub> can cause severe damage to the environment and foremost lead to increased eutrophication (= Eutrofizacja (Polish) / Övergödning (Swedish)) when it is emitted to the air. Apart from the nitrogen contamination, other significant differences have not been found. The energy content of the wood waste has even revealed it would suit well as bio-fuel, on the condition that proper equipment to reduce the NO<sub>x</sub> emissions is present. It has been calculated that the energy content, of the generated wood waste in Zbaszynek during Financial Year 2008, reached 310 GWh. Which can be compared to the electricity consumption of 78 GWh as was bought during the same time of period.</p><p>Four main possibilities have been investigated in this report and they are:</p><ul><li><p>- Selling the waste to cement producers as alternative fuel</p></li><li><p>- Make new products and use for furniture production again</p></li><li><p>- Make briquettes or pellets and sell as fuel</p></li><li><p>- Start up a Combined Heat and Power plant and produce electricity</p></li></ul><p>All these alternatives have their advantages and disadvantages but they all seem to be realistic solutions, on a few conditions.</p>
9

Waste from glued wood - A base for new products and/or bio-fuel?

Bjurman, Therese January 2009 (has links)
The Swedwood Company is a supplier to IKEA of wood furniture. They have grown larger concurrently with IKEA and at present they have 47 production units spread over twelve countries of which most are located in Eastern Europe. One of the factories is Zbaszynek which is located in Poland. They manufacture so called board-on-frame furniture. A board-on-frame is basically made out of particle board frames which are filled with special design paper that enfolds air. The frames are then covered with their skin; thinner particle boards, so called High Density Fibre (HDF) boards, and then edge banded with plastic stripes and painted and lacquered into desired design. This production generates not only furniture, last financial year Zbaszynek generated about 61 000 tons wood waste too. It can be compared to their total production of furniture which reached 439 000 tons during the same period of time. This generation of wood waste has caused a problem for Swedwood in general. A project called IKEA Goes Renewable (IGR) has started within IKEA with the aim to reduce the electric- and heat energy consumption and increase the use of renewable energy sources. But to be able to reduce the heat energy at a board-on-frame factory, such as Zbaszynek, there has to be an economic incentive to do so. But the wood waste is contaminated in comparison with waste from pure wood (free from adhesives, plastics etc.) so purchasers have been hard to find. And since the wood waste is used to generate the heat at the factories, the economic value has become relative low. Zbaszynek earn 1.4 €/MWh for their wood waste at present (energy value of 5.1 MWh/ton), while for example recycled contaminated wood chippings (RT-chippings) are worth about 7.3 €/MWh in Sweden (energy value of 4.4-5.1 MWh/ton). RT-chippings in Sweden are even allowed to contain more contaminations to receive that price, as long as it is not pressure creosoted. 1.4 €/MWh can also be compared to the economic value of coal which is about 13.7 €/MWh, and for district heating to households in Sweden was the average price about 68 €/MWh during 2007 (Energimarknadsinspektionen, 2007).Therefore, the main task of this thesis has been to investigate if there are any possible solutions to increase the economic value of the wood waste in Zbaszynek. There are more board-on-frame factories within Swedwood with the same problem, but Zbaszynek has been the pilot factory during this research. The first thing which should be considered in Zbaszynek is to keep the amount of waste as low as possible. The main task should be to reduce the amounts of wood waste; in the end it is a furniture factory and not a waste producer, which should be concerned before taking any further action. It is assumed though that this has already been thought through in Zbaszynek and further investigation of the waste has taken place.The wood waste has been sent to the Eurofins laboratory in Sweden for an analysis and the test results were then compared to wood waste of pure wood. The comparison indicates the nitrogen content being the main difference between Zbaszynek's wood waste and pure wood. Nitrogen compounds, often referred to as NOx can cause severe damage to the environment and foremost lead to increased eutrophication (= Eutrofizacja (Polish) / Övergödning (Swedish)) when it is emitted to the air. Apart from the nitrogen contamination, other significant differences have not been found. The energy content of the wood waste has even revealed it would suit well as bio-fuel, on the condition that proper equipment to reduce the NOx emissions is present. It has been calculated that the energy content, of the generated wood waste in Zbaszynek during Financial Year 2008, reached 310 GWh. Which can be compared to the electricity consumption of 78 GWh as was bought during the same time of period. Four main possibilities have been investigated in this report and they are: - Selling the waste to cement producers as alternative fuel - Make new products and use for furniture production again - Make briquettes or pellets and sell as fuel - Start up a Combined Heat and Power plant and produce electricity All these alternatives have their advantages and disadvantages but they all seem to be realistic solutions, on a few conditions.
10

Improving sawmill residue chip quality /

Wallace, Robert D., January 1993 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1993. / Vita. Abstract. Includes bibliographical references (leaves 145-148). Also available via the Internet.

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