Journal of the Textile Machinery Society of Japan

Study on Centrifugal Winding of Filaments

Part 1: Mechanical Analysis of Processing

Yoshinori Nishino

1981 Volume 27 Issue 1 Pages 1-9
Published: 1981
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.27.1

JOURNAL FREE ACCESS

Show abstractHide abstract

Basic characteristics of a new centrifugal winding method for composite pipe forming are quantitatively clarified. The main results are as follows:
(1) Conditions for stable winding-start were derived through experiments.
(2) Basic characteristics of winding speed and fiber winding tension in steady state were determined through winding curves and experiments.
(3) The limits of this centrifugal winding method were clarified concerning fiber configuration, diameter and length of the CW formed pipe, etc.

View full abstract

Download PDF (1028K)
Analysis of Temperature Dependence of Dynamic Loss Tangent (tan δ) Relating to Molecular Motion of Polymer Chain in Amorphous Region of Fiber and Fiber-Forming Polymeric Materials

Part 4: Evaluation of Heterogeneity of Fine Structure in Amorphous Region from Tan δ-Temperature Curve

Sei-ichi Manabe, Kenji Kamide, Chozo Nakayama, Shigeko Kobayashi

1981 Volume 27 Issue 1 Pages 10-21
Published: 1981
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.27.10

JOURNAL FREE ACCESS

Show abstractHide abstract

This paper intends to establish a method for estimating the detailed fine structure of amorpphous regions in polymer solids from dynamic loss tangent (tan δ)-temperature (T) curves in the temperature range where dynamic absorption (α_a; absorption) due to microbrownian movement of polymer segments appears. The amorphous region is assumed to be composed of many small particles, while the packing state of polymer segment is uniform. This small particle is regarded as a fundamental element. In order to express the distribution of elements, the distribution function of packing density F(n) is newly introduced. The value of tan δ for the polymer sample can be expressed by the summation of the product of tan δ value and elastic modulus fraction of individual element constituting the sample. Analytical method for determining F(n) from the experimental tan δ-T curve as well as from the apparent activation energy ΔH_a; is established. The validity of assumption adopted in this method is ascertained by the following experimental facts: The possible change in the fine structure of amorphous regions during measurement of tan δ-T curve is practically ignorable in many cases except for Nylon 6. The temperature dependence of ΔH_a;, calculated from F(n) and from the WLF equation, agrees qualitatively with that directly measured. For the samples having wide F(n), the temperature-time superposition correspondence law does not hold.

View full abstract

Download PDF (1488K)
Yarn End Retrieving from Bobbins in Axisymmetric Accelerated Flow

Part 2: Some Considerations on Hood Entrance Shape for Better Yarn End Retrieving

Tsuneo Hirai, Tsutao Katayama, Toyoki Tanaka, Naomichi Heya, Sadasuke ...

1981 Volume 27 Issue 1 Pages 22-27
Published: 1981
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.27.22

JOURNAL FREE ACCESS

Show abstractHide abstract

Effective boundary conditions for the yarn end retrieving by air suction, especially effective entrance guides for air inlet are investigated to determine the optimum operational conditions by using several different types of guides with various conical angles.
The pressure distributions along the bobbin axis obtained in the axisymmetrical canal between the bobbin and its hood show that the entrance with 0° or 90° conical angles is effective: either a hood provided with a skirt parallel to the bobbin axis or a hood with a circular plate perpendicular to the bobbin axis can cause turbulent flow desirable for yarn end retrieving. But power consumption and space saving must also be considered for selecting a good hood shape.

View full abstract

Download PDF (593K)

Register with J-STAGE for free!