Crystallinity of polyamide 6 staple fibers in the felt structure under simulated paper machine conditions
Tomi Hakala (Corresponding Author), Ali Harlin
BA35 Biomass processing and products
Polyamide 6 (PA6) is used in staple fibers and yarns in paper machine press felts due to its good mechanical properties. The crystalline modifications (α and γ forms) and the degree of crystallinity of PA6 can change under stress (compression) and heat (friction), which are present during mechanical dewatering (nip). Here, we investigate the effects of the molecular weight and crystallinity of a polymer on the mechanical properties of PA6 staple fibers such as wear resistance and compaction. The experimental part involves the ageing of felt specimens in a wet pressing simulator. The properties of the felt (air permeability), and the durability and branching of the staple fiber are examined as functions of the wear of a press felt and the crystallinity of the polymer. The changes that take place in the PA6 polymer are investigated using several techniques, and their connection with the properties of a new or aged press felt is discussed. The results indicate that the increase in molecular weight has a beneficial effect on the material's mechanical properties, and our observations also support previous studies on the crystallinity and branching of PA6.
https://doi.org/10.1002/app.33424
Aging of materials
Wear of materials
crystal structures
staple fibers
Hakala, T., & Harlin, A. (2011). Crystallinity of polyamide 6 staple fibers in the felt structure under simulated paper machine conditions. Journal of Applied Polymer Science, 120(4), 2222-2232. https://doi.org/10.1002/app.33424
Hakala, Tomi ; Harlin, Ali. / Crystallinity of polyamide 6 staple fibers in the felt structure under simulated paper machine conditions. In: Journal of Applied Polymer Science. 2011 ; Vol. 120, No. 4. pp. 2222-2232.
@article{ce8d47146b46452abd206c7ac981485f,
title = "Crystallinity of polyamide 6 staple fibers in the felt structure under simulated paper machine conditions",
abstract = "Polyamide 6 (PA6) is used in staple fibers and yarns in paper machine press felts due to its good mechanical properties. The crystalline modifications (α and γ forms) and the degree of crystallinity of PA6 can change under stress (compression) and heat (friction), which are present during mechanical dewatering (nip). Here, we investigate the effects of the molecular weight and crystallinity of a polymer on the mechanical properties of PA6 staple fibers such as wear resistance and compaction. The experimental part involves the ageing of felt specimens in a wet pressing simulator. The properties of the felt (air permeability), and the durability and branching of the staple fiber are examined as functions of the wear of a press felt and the crystallinity of the polymer. The changes that take place in the PA6 polymer are investigated using several techniques, and their connection with the properties of a new or aged press felt is discussed. The results indicate that the increase in molecular weight has a beneficial effect on the material's mechanical properties, and our observations also support previous studies on the crystallinity and branching of PA6.",
keywords = "ageing, crystal structures, molecular weight, polyamides, staple fibers",
author = "Tomi Hakala and Ali Harlin",
doi = "10.1002/app.33424",
Hakala, T & Harlin, A 2011, 'Crystallinity of polyamide 6 staple fibers in the felt structure under simulated paper machine conditions', Journal of Applied Polymer Science, vol. 120, no. 4, pp. 2222-2232. https://doi.org/10.1002/app.33424
Crystallinity of polyamide 6 staple fibers in the felt structure under simulated paper machine conditions. / Hakala, Tomi (Corresponding Author); Harlin, Ali.
In: Journal of Applied Polymer Science, Vol. 120, No. 4, 2011, p. 2222-2232.
T1 - Crystallinity of polyamide 6 staple fibers in the felt structure under simulated paper machine conditions
AU - Hakala, Tomi
AU - Harlin, Ali
N2 - Polyamide 6 (PA6) is used in staple fibers and yarns in paper machine press felts due to its good mechanical properties. The crystalline modifications (α and γ forms) and the degree of crystallinity of PA6 can change under stress (compression) and heat (friction), which are present during mechanical dewatering (nip). Here, we investigate the effects of the molecular weight and crystallinity of a polymer on the mechanical properties of PA6 staple fibers such as wear resistance and compaction. The experimental part involves the ageing of felt specimens in a wet pressing simulator. The properties of the felt (air permeability), and the durability and branching of the staple fiber are examined as functions of the wear of a press felt and the crystallinity of the polymer. The changes that take place in the PA6 polymer are investigated using several techniques, and their connection with the properties of a new or aged press felt is discussed. The results indicate that the increase in molecular weight has a beneficial effect on the material's mechanical properties, and our observations also support previous studies on the crystallinity and branching of PA6.
AB - Polyamide 6 (PA6) is used in staple fibers and yarns in paper machine press felts due to its good mechanical properties. The crystalline modifications (α and γ forms) and the degree of crystallinity of PA6 can change under stress (compression) and heat (friction), which are present during mechanical dewatering (nip). Here, we investigate the effects of the molecular weight and crystallinity of a polymer on the mechanical properties of PA6 staple fibers such as wear resistance and compaction. The experimental part involves the ageing of felt specimens in a wet pressing simulator. The properties of the felt (air permeability), and the durability and branching of the staple fiber are examined as functions of the wear of a press felt and the crystallinity of the polymer. The changes that take place in the PA6 polymer are investigated using several techniques, and their connection with the properties of a new or aged press felt is discussed. The results indicate that the increase in molecular weight has a beneficial effect on the material's mechanical properties, and our observations also support previous studies on the crystallinity and branching of PA6.
KW - ageing
KW - crystal structures
KW - molecular weight
KW - polyamides
KW - staple fibers
U2 - 10.1002/app.33424
DO - 10.1002/app.33424
Hakala T, Harlin A. Crystallinity of polyamide 6 staple fibers in the felt structure under simulated paper machine conditions. Journal of Applied Polymer Science. 2011;120(4):2222-2232. https://doi.org/10.1002/app.33424
10.1002/app.33424