Crystallinity of polyamide 6 staple fibers in the felt structure under simulated paper machine conditions

Tomi Hakala (Corresponding Author), Ali Harlin

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)2222-2232
Number of pages11
JournalJournal of Applied Polymer Science
Volume120
Issue number4
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

Fingerprint

Polyamides
Fibers
Polymers
Mechanical properties
Molecular weight
Felts
Air permeability
Dewatering
Wear resistance
Yarn
Durability
Compaction
Aging of materials
Simulators
Wear of materials
nylon 6
Friction
Crystalline materials

Keywords

  • ageing
  • crystal structures
  • molecular weight
  • polyamides
  • staple fibers

Cite this

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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.",
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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.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Crystallinity of polyamide 6 staple fibers in the felt structure under simulated paper machine conditions

AU - Hakala, Tomi

AU - Harlin, Ali

PY - 2011

Y1 - 2011

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

M3 - Article

VL - 120

SP - 2222

EP - 2232

JO - Journal of Applied Polymer Science

JF - Journal of Applied Polymer Science

SN - 0021-8995

IS - 4

ER -