Overview
ISO 365:1982 - "Textile machinery and accessories - Twin wire healds with inset mail for Jacquard weaving" specifies the main dimensions and designation rules for twin wire healds used in Jacquard looms. Developed by ISO/TC 72, this second edition replaces ISO 365:1976 and provides standardized forms, loop shapes and dimensional tables to ensure interchangeability and consistent manufacturing.
Key topics and technical requirements
- Scope: Lays down principal geometric characteristics of twin wire healds with inset mail for Jacquard weaving.
- Heald types:
- Type A: O-shaped upper and lower end loops (figure 1).
- Type B (two variants): upper end loop straight (to be bent into U-shape) with O-shaped lower loop (figure 2a), and upper end loop bent in U-shape with O-shaped lower loop (figure 2b).
- Inset mail designs: Illustrations include different inset mail forms (e.g., twisted-in type) and their placement in the heald eye (figures 3a, 3b).
- Dimensional parameters: The standard defines and labels critical dimensions such as internal width of upper end loop (b), length of upper end loop (h), length and internal width of inset mail, distance inside end loops (L), diameter of lower end loop, and wire thickness (d).
- Dimension tables: Coordinated dimension tables provide practical values (example entries show wire thicknesses such as 0.3, 0.35, 0.4 and 0.5 mm together with corresponding inset mail and loop sizes).
- Designation format: The document prescribes a clear part-numbering/example format for ordering, e.g.
Twin wire heald ISO 365 - A 0,4 x 350 - 4,0 x 1,5 (type A; wire 0.4 mm; L = 350 mm; eye 4.0 x 1.5 mm).
Applications and who uses it
- Textile machinery manufacturers: design and produce Jacquard healds to standardized dimensions for compatibility and quality control.
- Loom builders and integrators: ensure parts fit Jacquard frames and mechanisms correctly.
- Spare parts suppliers and procurement teams: specify exact heald dimensions and designation codes when ordering replacements.
- Quality engineers and inspectors: verify conformance to standardized loop, wire and inset mail dimensions.
- R&D and process engineers: reference dimensional standards when developing or retrofitting Jacquard systems.
Related standards
- Replaces ISO 365-1976 (first edition).
- Developed under ISO/TC 72 (Textile machinery and allied machinery and accessories).
For additional interoperability and manufacturing tolerances, consult other ISO textile machinery standards listed in the ISO catalogue.
Keywords: ISO 365:1982, twin wire healds, Jacquard weaving, inset mail, heald dimensions, textile machinery standard, heald designation.
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