Sorption Properties of Thermal Insulation Composed of Flax or Hemp Fibers

Hellová, Katarína E.; Unčík, Stanislav; Cabanová, Terézia

doi:10.2478/sjce-2020-0023

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…5 , 11 , 18 , 30 Therefore, the obtained hemp nonwovens are potential substitutes for traditional materials used in thermal insulation applications. 31 Some possible applications could be textile elements for improved military cold weather clothing, hand wear, and sleeping bags, where a minimum heat transfer is essential. 32 Another potential field of application would be the automotive industry, where these materials could be used for covering seats, door panels, or headliners.…”

Section: Resultsmentioning

confidence: 99%

Sustainable materials with high insulation capacity obtained from wastes from hemp industry processed by wet-laid

Gutierrez-Moscardo

Canet

Gomez‐Caturla

et al. 2021

Textile Research Journal

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This article reports on the revalorization of hemp waste from the textile industry, focusing on the development of new sustainable materials with high insulating properties. Wet-laid technology was used to manufacture nonwovens with different binding fibers, polylactic acid, and viscose fibers. The characterization of the acoustic insulating capacity was carried out using a Kundt tube, and the thermal insulating performance by measuring the heat transmission resistance ( R) and thermal conductivity ( λ). The results showed that the developed nonwovens have lower thermal conductivity values of about 0.027–0.034 W/(m K), were even lower than those of traditional thermal insulating materials, being the sample with 100 g/m2 of areal density and with a composition of 80% of hemp, 10% of polylactide and 10% of viscose the one with the lowest thermal conductivity (0.027 W/(mK). Their acoustic absorption capacity was around 0.76 at a frequency of 6 kHz, in samples containing high hemp waste (>80 wt%). However, the heterogeneous, discontinuous, and high void density structure that contributes to excellent insulating properties, lead to a decrease in their mechanical properties. This demonstrated that these materials are suitable for substituting traditional materials in insulating applications. Additionally, antifungal tests were carried out. However, hemp nonwovens proved to be inefficient against fungal proliferation.

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Section: Resultsmentioning

confidence: 99%

Sustainable materials with high insulation capacity obtained from wastes from hemp industry processed by wet-laid

Gutierrez-Moscardo

Canet

Gomez‐Caturla

et al. 2021

Textile Research Journal

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“…Therefore, the durability of LCB-based thermal insulation materials also includes biological resistance which is dependent on temperature and humidity variations but is largely poorly investigated, as reviewed by Schritt and Pleissner [ 10 ]. The water-related thermal properties of LCB-based materials are also of high importance to be investigated [ 5 ] because varying humidity impacts not only biodeterioration but also the thermal properties [ 13 , 14 ]. Some natural mold resistance associated with the chemical composition of different wood species containing antifungal compounds was revealed on wood flour [ 15 ] and wood–plastic composites [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Mold Fungal Resistance of Loose-Fill Thermal Insulation Materials Based on Processed Wheat Straw, Corn Stalk and Reed

Tupciauskas,

Orlovskis,

Blums

et al. 2024

Polymers

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The present study evaluates the mold fungal resistance of newly developed loose-fill thermal insulation materials made of wheat straw, corn stalk and water reed. Three distinct techniques for the processing of raw materials were used: mechanical crushing (Raw, ≤20 mm), thermo-mechanical pulping (TMP) with 4% NaOH and steam explosion pulping (SEP). An admixture of boric acid (8%) and tetraborate (7%) was applied to all processed substrates due to their anti-fungal properties. The fourth sample group was prepared from SEP substrates without added fungicide (SEP*) as control. Samples from all treatments were separately inoculated by five different fungal species and incubated in darkness for 28 days at 28 °C and RH > 90%. The highest resistance to the colonization of mold fungi was achieved by TMP and SEP processing, coupled with the addition of boric acid and tetraborate, where molds infested only around 35% to 40% of the inoculated sample area. The lowest mold fungi resistance was detected for the Raw and SEP* samples, each ~75%; they were affected by rich amount of accessible nutrients, suggesting that boric acid and tetraborate additives alone did not prevent mold fungal growth as effectively as in combination with TMP and SEP treatments. Together, the achieved fungal colonization scores after combined fungicide and pulping treatments are very promising for the application of tested renewable materials in the future development of thermal insulation products.

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“…Despite the many advantages of natural insulation material, however, consumers and construction professionals are still facing many challenges, including technical limitations, lack of standards and regulations, and insufficient awareness of the potential of these materials. Consequently, continued research and development of these materials are necessary to overcome these obstacles (Hellová et al, 2020). The transition to natural insulation is not only a question of sustainability but also a question of future environmental protection (Ulutaş et al 2023).…”

Section: Introductionmentioning

confidence: 99%

11th Hardwood Conference Proceedings

2024

Hardwood Conference Proceedings

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Black locust (Robinia pseudoacacia L.) is the most widespread non-native tree species in Europe and has had a significant impact on the Central European landscape and forestry. The black locust has many exceptional characteristics that represent considerable potential for use by man. The climate shift in recent decades in Central Europe could further strengthen the importance of this tree species. However, there are also risks arising from the invasiveness of the black locust. Like Hungary, Czechia has had many years of experience with this tree species. Still, the current approach between these two countries, particularly in conventional forestry, differs. This paper attempts to summarise how the management of Robinia and its stands is viewed in Czechia, where the common forestry utilization of black locust is currently not considered due to its invasiveness. The reason for a more reserved forestry attitude in Czechia can be associated with the relatively frequent stem deformities of Robinia stands, which are often attributed to frost. However, the frost deformities and low stem-form quality of some Robinia stands do not affect their vigour and potential to invade adjacent habitats. It often takes considerable effort to remove black locust, especially where the spreading of Robinia threatens valuable adjacent ecosystems. On the other hand, there is great potential for the use of Robinia in Czechia. It can be found in controlled energy crops, fast-growing plantations (lignicultures), some land reclamation projects or urban greenery. Robinia can also be grown in small stands or in groups of trees surrounded by arable land that does not allow the tree to spontaneously spread. Regarding the production plantations of Robinia, the Hungarian experience and breeding program can be very inspiring for Czechia. Generally, there is a move towards 'site-specific management', but with a strong emphasis on the precautionary principle. Finding and then consistently applying a balanced approach to black locust management that not only allows for the potential but also respects the risks of Robiniait is currently a key challenge for Czech forestry, landscape and nature conservation.

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Sorption Properties of Thermal Insulation Composed of Flax or Hemp Fibers

Cited by 5 publications

References 8 publications

Sustainable materials with high insulation capacity obtained from wastes from hemp industry processed by wet-laid

Sustainable materials with high insulation capacity obtained from wastes from hemp industry processed by wet-laid

Mold Fungal Resistance of Loose-Fill Thermal Insulation Materials Based on Processed Wheat Straw, Corn Stalk and Reed

11th Hardwood Conference Proceedings

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