Multi-Substrate Hinged Media for Flat-Lying Thick Books
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Solution Overview
Problem
Conventional perfect binding methods result in thicker books that cannot be opened flat due to bulging and degradation in appearance, limiting the thickness of books that can be produced using hinged media, and wide hinges cause undesirable color shifts in the imaging area.
Innovation Solution
A system and method for configuring multi-substrate hinged media with varying sizes of hinge sections, allowing pages to lie flat by assigning specific media variants to document pages based on page assignment rules, enabling the production of thicker books without manual evaluation or exception programming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of sheets in a booklet is increased, then the book thickness increases, but the fold line becomes rounded and bulged causing degradation in appearance and the book cannot be opened flat
Solution Approach 1:
The booklet is divided into multiple signature sections, each with its own fold line. By segmenting the binding structure, each individual fold line experiences reduced stress and curvature, preventing the rounded and bulged appearance that occurs in thick conventional booklets. This allows the booklet to maintain a flat fold line even with a large total number of sheets.
2Ease of operation
If a wide hinge is used to allow pages to lie flat in thicker books, then the book can be opened flat, but content imaged on the hinge shows substantial color shifts
Solution Approach 1:
The hinge structure is segmented into multiple narrow hinge sections distributed across different signature sections, rather than using a single wide hinge. This segmentation allows each hinge section to be narrow enough to avoid color shifts in imaged content while collectively providing sufficient flexibility for the entire thick book to open flat.
Solution Approach 2:
Different regions of the booklet are assigned different hinge characteristics - each signature section has its own appropriately sized hinge section. This local optimization ensures that hinge sections are only as wide as needed for their local requirement, preventing color shifts in imaged areas while maintaining the ability of thick books to open flat through cumulative flexibility.
Data Source
AI summary
A system and method for enabling production of larger books utilizing a multi-substrate hinged media. A media definition for a specialty media can be enhanced to include information about multiple variants that contain varying sizes of hinge sections related to a specific media and a page assignment rule. The set of hinged media variants can be treated as a single media type and the properties of the media type determine sheet thresholds for each variant. The specific media variants can be assigned to specific document pages based on the page assignment rule. The pages in the center of the book utilize larger hinges to allow the pages to lie flat, while pages at the beginning and end of the book utilize smaller hinges to prevent imaging on the hinge area.