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Textile Waste from Woollen Yarn Production as Raw Materials for Thermal Insulation Products Cover

Textile Waste from Woollen Yarn Production as Raw Materials for Thermal Insulation Products

Fibres & Textiles in Eastern Europe
Volume 30 (2022): Issue 5 (October 2022)
By: Sigitas Vėjelis,  Saulius Vaitkus,  Audronė Sankauskaitė,  Arūnas Kremensas and  Jurga Šeputytė Jucikė  
Open Access
|Dec 2022

Figures & Tables

Fig. 1

Dependence of thermal conductivity on the density of specimens of 100% polylactide fibres (PLA): ○ – experimental data; (──) – regression line (equation (3)); and woollen yarn waste (Table 1, mixture No 1): ◊ – experimental data; (─ ─ ─) – regression line (equation (4))
Dependence of thermal conductivity on the density of specimens of 100% polylactide fibres (PLA): ○ – experimental data; (──) – regression line (equation (3)); and woollen yarn waste (Table 1, mixture No 1): ◊ – experimental data; (─ ─ ─) – regression line (equation (4))

Fig. 2

Relationship between thermal conductivity and density: a) composite without added yarns (Table 1, mixture No 2); ○, □ – experimental data; (──) – thermally untreated specimen (regression line according to equation (5)); (- - -) – thermally treated specimen (regression line according to equation (6)); b) composite with added yarns (Table 1, mixture No 3); ○, □ – experimental data; (──) – thermally untreated specimen (regression line according to equation (7)); (- - -) – thermally treated specimen (regression line according to equation (8))
Relationship between thermal conductivity and density: a) composite without added yarns (Table 1, mixture No 2); ○, □ – experimental data; (──) – thermally untreated specimen (regression line according to equation (5)); (- - -) – thermally treated specimen (regression line according to equation (6)); b) composite with added yarns (Table 1, mixture No 3); ○, □ – experimental data; (──) – thermally untreated specimen (regression line according to equation (7)); (- - -) – thermally treated specimen (regression line according to equation (8))

Fig. 3

Structure of fibres and contact zones of thermally treated composite (Table 1, mixture No 2): a – sheep wool fibres; b – general view of interconnected fibres of composite; c – network of interconnected polylactide fibres; d – network of interconnected sheep wool and polylactide fibres
Structure of fibres and contact zones of thermally treated composite (Table 1, mixture No 2): a – sheep wool fibres; b – general view of interconnected fibres of composite; c – network of interconnected polylactide fibres; d – network of interconnected sheep wool and polylactide fibres

Quantity of non-fibrous matter in long and medium length fibres

No. of specimenNon-fibrous matter, mass %
Quantity of oils, fats, and waxesSalts and etc.
11.12.7
21.02.8
Mean value1.12.8

Compositions of mixtures for the production of thermal insulation

Mixture No.Weight percentage of input components, %
Waste from woollen yarn productionPLAWaste from defibered woollen yarn
1100--
28713-
3741115

Results of the statistical processing of the thermal conductivity of PLA fibres and woollen yarn waste

Number of regression equationNumber of tests (estimations)Values of constant coefficientsSr, W/(m·K)R2λ10·φ
b0b1b2
3180.02230.0000690.38130.0001680.998
4240.02580.0000410.28180.0001700.995

Quantity of fibrous matter in long and medium length fibres

No. of specimenFibres, mass %
Sheep wool fibresPolyamide Wood resins and fibres polyesterCellulose fibres (grass, wood pieces and etc.)
194.70.5 0.10.9
295.30.4 0.10.4
Mean value95.00.4 0.10.6

Quantity of fibrous matter in short length fibres

No. of specimenFibre content, mass %
Sheep wool fibresWood resins, polyester fibres, and polyamide fibresCellulose fibres (grass, wood pieces and etc.)
191.21.47.4
291.61.27.2
393.00.66.4
Mean value91.91.17.0

Results of the statistical processing of the thermal conductivity of composites

Number of regression equationNumber of tests (estimations)Values of constant coefficientsSr, W/(m·K)R2λ10 ·φ
b0b1b2
5120.02420.0001240.3050.0003540.993
6120.01890.0002060.4120.0002760.997
7120.01830.0002400.3980.0001730.998
8120.01450.0003200.4860.0005660.988

Composition of woollen yarn waste

Amount, mass %
Long fibres (>30 mm)Average fibres (10÷30 mm)Short fibres and dusts (< 10 mm)
47.726.326.0
DOI: https://doi.org/10.2478/ftee-2022-0039 | Journal eISSN: 2300-7354 | Journal ISSN: 1230-3666
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Language: English
Page range: 8 - 16
Published on: Dec 22, 2022
Published by: Łukasiewicz Research Network, Institute of Biopolymers and Chemical Fibres
In partnership with: Paradigm Publishing Services
Publication frequency: Volume open
Keywords:
textile waste,
sheep wool,
polylactide fibres,
thermal insulation,
thermal conductivity
Related subjects:
Business and economics,
Business management,
Business informatics,
Process management,
Industrial chemistry,
Cellulose, paper and textiles,
Polymer science and technology,
Materials sciences,
Biomaterials and natural materials

© 2022 Sigitas Vėjelis, Saulius Vaitkus, Audronė Sankauskaitė, Arūnas Kremensas, Jurga Šeputytė Jucikė, published by Łukasiewicz Research Network, Institute of Biopolymers and Chemical Fibres
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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