Overview
IEC TR 62780:2012 - "Multimedia systems and equipment - Multimedia e-publishing and e-book - Guidelines for protection against mechanical stress during distribution of e-books in CD and DVD media" - provides practical guidance to protect interchangeable optical storage media (CDs, DVDs) used to distribute e-books. The Technical Report documents stress–strain behavior of disc materials (polycarbonate), defines elastic and residual strain limits, and recommends protection schemes for including optical media in books, magazines and media cases during distribution and storage.
Key topics and technical requirements
- Scope & purpose: Supplements IEC 62229 by addressing mechanical protection of e-book media (CD/DVD) during distribution and keeping.
- Stress–strain characteristics: Tensile tests and simulations on polycarbonate disc material identified linear behaviour up to about 0.7% strain and a Young’s modulus of approximately 2.89 GPa in that linear range.
- Bending (residual strain) limit: No permanent (residual) strain is generated when disc deflection at 35 mm from the center is less than 8.8 mm. This bending limit is the basis for protection measures.
- Elastic limit and residual strain: Residual strain occurs when the stress or deflection exceeds the elastic limit; the report defines these terms and relates them to handling practices.
- Retention/clamping considerations: For media clamped in cases, the retaining force of the disc center hole (friction with the case clamp) should be controlled so it does not induce bending beyond the specified limit.
- Recommended protection schemes (illustrated and described):
- Attaching a medium envelope to a page
- Attaching an envelope to the gutter
- Binding a substrate that includes a medium into a book
- Attaching a substrate with a medium to the cover of a casebound book
- Guidelines for media clamped in a media case (control of retaining force)
Applications and who should use it
- Publishers and printers embedding CD/DVD e-books in paper books or magazines.
- Packaging designers and fulfillment/logistics teams responsible for bulk wrapping, bundling and distribution of media-bound publications.
- Hardware and accessory manufacturers (media cases, sleeves, binding suppliers) that must ensure clamp designs and envelopes do not induce damaging bending or residual strain.
- Quality assurance and testing engineers validating mechanical protection and handling procedures for optical media distribution.
Related standards
- IEC 62229:2005 - Multimedia e-publishing and e-book - Conceptual model for multimedia e-publishing (this technical report supplements IEC 62229).
- Consult applicable optical media and packaging standards when integrating IEC TR 62780 guidance into product or publication workflows.
Keywords: IEC TR 62780:2012, multimedia e-publishing, e-book distribution, CD/DVD mechanical stress, optical storage media protection, stress-strain, residual strain, elastic limit, polycarbonate discs.