scholarly journals Possible Use Of Hemp And Wood In Production Of The Heat Insulation Materials

2015 ◽  
Vol 1 ◽  
pp. 323
Author(s):  
Martins Andzs ◽  
Voldemars Skrupskis
Keyword(s):  
Moisture Content ◽  
Water Absorption ◽  
Heat Insulation ◽  
Raw Material ◽  
Insulation Material ◽  
Heat Transmission ◽  
Insulation Materials ◽  
Wood Fibres ◽  
Heat Insulation Material ◽  
Renewable Raw Material

Obtaining of a new ecological heat insulation material from always renewable raw material in nature, wood and hemp, derived from wood and hemp fibre remains left from the production process. The study was carried out to find hemp wood parts (shives), fiber, and material first possible compositions together with wood fibres, to produce heat insulation materials. The use of the heat insulation material would be meant for dwelling and recreation houses. In the present research the main characteristics of these materials are determined: moisture content, density, water absorption, as well as the coefficient of heat transmission.

scholarly journals Impact of wood fraction, moisture and steam explosion on the development of an innovative insulation material

2015 ◽  
Vol 1 ◽  
pp. 11
Author(s):  
Martins Andzs ◽  
Ramunas Tupciauskas ◽  
Andris Veveris ◽  
Janis Gravitis
Keyword(s):  
Bulk Density ◽  
Steam Explosion ◽  
Heat Insulation ◽  
Raw Material ◽  
Added Value ◽  
Time Interval ◽  
Insulation Material ◽  
Innovative Products ◽  
Heat Insulation Material ◽  
Betula Verrucosa

<p class="R-AbstractKeywords"><span lang="EN-GB">The study shows development of an innovative bulk heat insulation material from grey alder (<em>Alnus incana</em> L. Moench) chips and birch (<em>Betula pendula, Betula verrucosa</em>) flakes as residues of plywood production. The research is actual for the plywood production companies and for producers that process grey alder chips to make an innovative products with high added value. Chips and flakes eco-efficient converted to fibrous mass by steam explosion (SE) technology at temperatures (T) of 200 to 235 °C and time interval of 0 to 5 min. Application of SE technology to obtain fibrous insulating material is in the news at a global level and has not been studied previously. The bulk density of raw and SE materials determined using standardised method specified in LVS EN 15103: 2010. The bulk density of SE materials studied depending on the raw material fraction and moisture as well as depending on the SE conditions. The lowest bulk density (53 kg m<sup>-3</sup>) achieved SE material of grey alder chips with 12% of raw moisture processed at T 235 °C for 1 min. This is the optimal result, which reveals the industrial competitiveness of bulk heat insulation materials and indicate the justification for the further examination.</span></p>

scholarly journals The Use of Coniferous Greenery for Heat Insulation Material Production

2015 ◽  
Vol 72 ◽  
pp. 209-215 ◽  
Author(s):  
Indra Muizniece ◽  
Dagnija Blumberga ◽  
Ance Ansone
Keyword(s):  
Heat Insulation ◽  
Insulation Material ◽  
Material Production ◽  
Heat Insulation Material

Performance of Nano-Silica Insulation Material Enhanced by High Humidity-Reinforcement Method

2016 ◽  
Vol 697 ◽  
pp. 433-436
Author(s):  
Shi Chao Zhang ◽  
Yu Feng Chen ◽  
Wei Wu ◽  
Hao Ran Sun ◽  
Guang Hai Wang ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Raw Material ◽  
High Humidity ◽  
Insulation Material ◽  
Condensation Polymerization ◽  
Drying Process ◽  
Nano Silica ◽  
Insulation Materials ◽  
The One ◽  
Strength Improvement

In this paper, fumed nano-silica as the main raw material, nano-silica insulation materials were prepared by the dry processing. Research on humidity-reinforcement of nano-Silica insulation materials has been carried out and analyzed. When hygroscopicity of samples reach to 23%, the compressive strength 1.65MPa is at twice the one without high humidity-reinforcement, while the thermal conductivities are almost the same. Then, the action mechanism of high humidity-reinforcement method was analyzed. In humidity-reinforcement method, as vapor enters, silica sol is formed in the gap between one aggregate particle and another, and various condensation polymerization occurred in the drying process, which lead to aggregates connection and compressive strength improvement.

Influence of Heat Insulation Material on Thermal Stress of Long Nozzle

2012 ◽  
Vol 535-537 ◽  
pp. 1609-1614 ◽  
Author(s):  
Hui Min Liu
Keyword(s):  
Thermal Stress ◽  
Layer Thickness ◽  
Outer Layer ◽  
Heat Insulation ◽  
Outer Wall ◽  
Symmetric Model ◽  
Insulation Material ◽  
Axially Symmetric ◽  
Coefficient Of Thermal Conductivity ◽  
Heat Insulation Material

To prevent a long nozzle (LN) of non-preheating from rupture caused by thermal shock, heat insulation material (HIM) with a lower coefficient of thermal conductivity (CTC) was compounded in the inner hole (inner layer) or around the outer wall (outer layer), and the thermal stress was investigated. The two-dimension axially symmetric model of LN was proposed by simplifying the structure and boundary conditions. The influences of the HIM to the thermal stress of LN were analyzed by finite element method. The results show that the thermal stress suffered by LN can be drastically reduced by the inner layer, making the slow variation, but when its thickness increases from 2 mm to 3 mm, it almost has no influence on the thermal stress. The maximum thermal stress at the neck of LN reduces with the depression of the CTC at the inner layer thickness of 2 mm. The maximum thermal stress of LN can’t be reduced by outer layer, but the lasting time of higher stress can be shortened, and the thermal stress at the later period of steel-irrigating can be lowed. When the outer layer thickness is more than 2 mm, the increase of it has little influence on the thermal stress of LN, and the change of its CTC has little influence on the thermal stress either. The LN with tri-layer has lower thermal stress during all the period of steel-irrigating.

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