SIST ISO 1139:1998 PDF

Overview

SIST ISO 1139:1998 - Textiles – Designation of Yarns is an international standard that specifies two primary methods for indicating the composition and construction of yarns. Developed by the Institute for Standardization of Slovenia (SIST), this standard ensures consistent and clear communication across the textile industry regarding the characteristics of single, folded, cabled, or multiple wound yarns. By standardizing yarn notation, including linear density in the Tex System, number of filaments, and yarn construction features, SIST ISO 1139:1998 supports precise specification and quality control in manufacturing, trade, and textile testing.

Key Topics

• Yarn Notation Methods:

  • Single-to-Fold Notation: Starts from the linear density of single yarns and builds to describe complex structures.
  • Fold-to-Single Notation: Begins from the resultant linear density of the final yarn product, working backward to its components.

• Linear Density (Tex System):

  • Linear density is a critical property for yarn specification, expressed in tex (mass in grams per 1,000 meters).
  • The Tex System is consistent, facilitating international trade and comparison.

• Yarn Composition and Structure:

  • Covers single, folded, cabled, and multiple wound yarns.
  • Specifies indication of number of filaments in filament yarns.
  • Uses standardized symbols (e.g., for direction and amount of twist, filament count).

• Exclusions:

  • Does not address special yarn types like fancy, textured, or bulked yarns, or yarns wrapped with other materials.
  • Does not include information on after-treatments or package types.

Applications

SIST ISO 1139:1998 is widely used in various textile industry segments for practical and quality-driven purposes:

• Manufacturing:

  • Enables accurate documentation and communication of yarn characteristics between suppliers and manufacturers.
  • Supports manufacturing process control by using standardized values for linear density, twist, and yarn structure.

• Textile Testing and Quality Assurance:

  • Provides a basis for technical documentation in analysis and testing of yarns.
  • Ensures consistency in reporting actual versus nominal yarn properties.

• Trade and Procurement:

  • Facilitates unambiguous trade agreements and product specifications by providing a universal yarn designation system.
  • Minimizes misunderstandings between buyers and sellers by using standardized terms and notation.

• Research and Development:

  • Assists in textile research where clear yarn specifications are essential for reproducibility and innovation.
  • Supports data comparison across projects and international borders.

Related Standards

• ISO 2: Textiles – Designation of the Direction of Twist in Yarns and Related Products Standardizes notation for twist direction crucial to yarn structure.

• ISO 858: Netting Yarns for Fishing Nets – Designation in the Tex System Aligns yarn designation for specialized netting yarns with the Tex System.

• ISO 1144: Textiles – Universal System for Designating Linear Density (Tex System) Establishes tex as the universal unit for expressing yarn linear density.

• ISO 2947: Textiles – Integrated Conversion Table for Replacing Traditional Yarn Numbers by Rounded Values in the Tex System Supports conversion and rounding of legacy yarn numbers to tex values for consistency.

Summary

Adopting SIST ISO 1139:1998 ensures a standardized approach to the designation of yarns within the textile industry, improving clarity in specifications, communication, and quality assurance throughout the value chain. By leveraging the Tex System and unified notation, the standard enhances efficiency, supports global trade, and promotes interoperability among industry stakeholders.