Sheep Wool Thermal Insulating Mattresses Behaviour in the Water Vapours Presence

Hegyi, Andreea; Dico, Carmen; Szilagyi, Henriette

doi:10.1016/j.promfg.2020.03.060

Cited by 9 publications

(12 citation statements)

References 6 publications

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“…As a result of this behavior, it can be appreciated that this type of products contributes not only to the thermal insulation of the interior space but also to the regulation of its humidity. Analyzing the allure of the sorption curves, it can be seen that they are consistent with previous results obtained in the literature [ 25 , 34 , 60 , 61 , 62 ], which indicates that the water absorption of up to 5% of the fiber drying weight is carried out with a higher speed, the water binding strongly, after which, the phenomenon is influenced by the relative humidity of the environment, the speed stabilizing towards the saturation zone, a fact also identified by the analysis of the slope of the sorption curves, respectively, desorption. Considering that the thermal insulation of the building, on the inside can be done for walls, floors, and ceilings, and the volume of indoor air is proportional to their surface area, the literature also points to a high probability of meeting the needs of the improving indoor air quality through the use of this type thermal-insulating material [ 23 , 25 , 27 , 28 , 49 ].…”

Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 89%

“…The medullary canal is responsible for the characteristic of general hygroscopicity of the wool thread, being known that it absorbs 15–18% of the mass water vapor under normal conditions (20 ± 5 °C, 50–65% RH), but can reach up to 40% under saturated atmosphere conditions (100% RH), absorption that occurs through the expansion of the medullary canal, the diameter of the thread can increase by up to 18% and its length by 1% [ 21 ]. According to Downes and Mackay [ 34 ], sorption and desorption of moisture under the influence of relative humidity is one of the fundamental properties of wool fibers. Research has shown that, in general, the vapor transfer inside thermal-insulating materials and not only, is influenced by the phenomenon of sorption and the specific resistance to the flow of water vapor, so for two products with equal densities, the water vapor resistance factor, µ, can be much different.…”

Section: Introductionmentioning

confidence: 99%

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Improving Indoor Air Quality by Using Sheep Wool Thermal Insulation

Hegyi

Bulacu²,

Szilagyi

et al. 2021

Materials

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Currently, the need to ensure adequate quality of air inside the living space but also the thermal efficiency of buildings is pressing. This paper presents the capacity of sheep wool heat-insulating mattresses to simultaneously provide these needs, cumulatively analyzing efficiency indicators for thermal insulation and indicators of improving air quality. Thus, the values obtained for the coefficient of thermal conductivity, and its resistance to heat transfer, demonstrate the suitability of their use for thermal insulation. The results of the permeability to water vapor characteristics on the sorption/desorption of water, air, demonstrate the ability to control the humidity of the indoor air and the results on the reduction of the concentration of formaldehyde, demonstrating their contribution to the growth of the quality of the air, and to reduce the risk of disease in the population.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improving Indoor Air Quality by Using Sheep Wool Thermal Insulation

Hegyi

Bulacu²,

Szilagyi

et al. 2021

Materials

Self Cite

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“…It can be concluded that there is almost no moisture in the blend, even when kept in ambient conditions. For comparison, cotton fibers contain between 5 and 10 wt.% of moisture [ 63 ] and wool-based textiles can reach 40 wt.% [ 64 ]. The TGA curve of the neat PP is also illustrated in Figure 3 B, and it shows slight differences compared to the loaded PP curves: at 300 °C, the neat PP loses 0.3 wt.%—this loss was equal to 1 and 1.2 wt.%, respectively, for the dried and non-dried samples containing hydrolyzed casein.…”

Section: Resultsmentioning

confidence: 99%

Antibacterial Textile Based on Hydrolyzed Milk Casein

et al. 2021

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Antimicrobial textile structures are developed based on polypropylene (PP) and a natural material, hydrolyzed casein. The casein, from bovine milk, is subjected to acid hydrolysis in aqueous media, then blended into the PP matrix in the melt phase by extrusion. The obtained blend, containing 5 wt.% of hydrolyzed casein, is then processed by a melt spinning process to get multifilaments, leading to the production knitting structures. Thanks to the addition of the hydrolyzed casein, the obtained textile showed a strong antibacterial activity towards both Gram (+) and Gram (−) bacterial strains. The addition of 5 wt.% hydrolyzed casein does not significantly impact the mechanical properties of PP in the dumbbells form, but a small decrease was observed in the tenacity of the filaments. No moisture retention was observed after the addition of hydrolyzed casein, but the rheological behavior was slightly affected. The obtained results can contribute to addressing concerns regarding nonrenewable antibacterial agents used in textile materials, particularly their effects on the environment and human health, by offering antibacterial agents from a biobased and edible substance with high efficiency. They are also promising to respond to issues of wasting dairy products and recycling them, in addition to the advantages of using melt processes.

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“…The obtained results may be related to the occurrence of different types of hair cover in sheep and goats. In the case of sheep, it is wool, the task of which is to maintain adequate thermal insulation of the skin; additionally, a suint is deposited on the skin, which can constitute from 3 to 30% of the weight of wool [ 5 , 16 ]. Due to the content of fatty acids, the suint has bacteriostatic properties [ 17 ], which could have resulted in a lower and less differentiated level of the studied groups in sheep compared with goats.…”

Section: Discussionmentioning

confidence: 99%

The Level of Selected Bacterial Phyla on the Skin Surface of Small Ruminants According to the Breed and Species

Cholewińska

Nazar

Junkuszew

et al. 2021

Animals

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For decades, skin has been assigned the main role of an insulator of the inside of the body from the external environment, but it also plays a role in maintaining homeostasis. In this study, the level of selected bacterial phyla (Firmicutes, Bacteroidetes, Proteobacteria and Actinobacteria) was assessed in three sheep breeds (Świniarka sheep, Uhruska sheep and BCP line (synthetic sheep breed; n = 6) and in two breeds of goats (Boer, Saenian; n = 6) living in the same environment and fed on the same feed, where the aim was to identify differences in terms of race, species and individual differences. Significant differences were found in Firmicute, Actinobacteria and Proteobacteria phyla (p ≤ 0.05). Statistically significant and positive correlations were demonstrated between Actinobacteria and Proteobacteria, Proteobacteria and Bacteroidetes or Firmicutes and Bacteroidetes. The obtained results suggest that the species and racial differences in the level of the studied bacterial phyla may also result from the physicochemical differences of the skin surface, as they could exacerbate the variations in humidity, temperature, composition of antimicrobial peptides (AMP) and lipid content. In addition, individual differences were observed, which indicate a similar effect of an individual on the microbiological composition of its organism.

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Sheep Wool Thermal Insulating Mattresses Behaviour in the Water Vapours Presence

Cited by 9 publications

References 6 publications

Improving Indoor Air Quality by Using Sheep Wool Thermal Insulation

Improving Indoor Air Quality by Using Sheep Wool Thermal Insulation

Antibacterial Textile Based on Hydrolyzed Milk Casein

The Level of Selected Bacterial Phyla on the Skin Surface of Small Ruminants According to the Breed and Species

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