ISO 7761:2004

Overview

ISO 7761:2004 - Micrographics - Single-core cartridge for 16 mm processed microfilm - Dimensions and operational constraints - defines the physical and performance requirements for cartridges used to store and view active-use 16 mm microfilm. The standard sets precise cartridge and reel dimensions, operational constraints, compatibility requirements and test procedures to ensure reliable interfacing with readers and reader-printers. Note: ISO 7761:2004 explicitly does not apply to cartridges intended for archival long‑term storage.

Key topics and technical requirements

• Dimensional specifications: Detailed dimensions and tolerances are given for both open and enclosed single‑core cartridge assemblies (outer enclosure + reel). The standard provides figures and tables that define critical clearances to prevent rubbing and ensure cross‑vendor compatibility.
• Manufacturing tolerances: Moulding tolerances, fillet and corner radii, general wall thickness (nominal 2.0 mm) and acceptable draft angles are specified to guide production and tooling.
• Materials and finish: Requirements address material selection, surface finish, label recesses and prohibition of contaminants (oil, wax). Materials must be compatible with film to avoid image loss.
• Mechanical tests:
  • Maximum‑speed handling: unthread a 3 m film strip, run back and forth 25 cycles at the reader’s maximum speed - no image deterioration allowed.
  • Impact strength: cartridge with 30.5 m of 0.130 mm film dropped from 1.2 m onto a flat steel surface four times (corner, edge, both faces) without rupture or loss of function.
  • Test environment: conditioning at (50 ± 5)% RH and 23 °C ± 2 °C for 24 h prior to testing.
• Film/reel requirements: Reel dimensions, leader/trailer specifications, leader-film and core-film secureness criteria, winding and image placement rules to ensure automatic threading and correct image alignment.
• Operational constraints: Lubrication should not be required; markings must be flush or recessed; recommended reel widths to avoid cartridge wall contact.

Applications and who uses this standard

ISO 7761:2004 is intended for:

• Manufacturers of single‑core cartridges and 16 mm microfilm reels
• Designers and integrators of microfilm readers, reader‑printers and automatic threading systems
• Quality control and testing laboratories verifying cartridge performance and compatibility
• Document management vendors and micrographics service providers ensuring cross‑vendor interoperability

Practical benefits include improved mechanical interchangeability, reduced film damage during use, predictable behaviour in automatic threading equipment, and clear manufacturing guidance for consistent product quality.

Related standards

Normative and associated references cited in ISO 7761 include:

• ISO 6148 (micrographic film spools and cores)
• ISO 6196 series (micrographics vocabulary)
• ISO 6199 (operating procedures for 16 mm microfilming)

Keywords: ISO 7761:2004, 16 mm microfilm, single‑core cartridge, micrographics, cartridge dimensions, operational constraints, compatibility requirements, test procedures.