Contoured Printing Blanket Edge Reduces Impact and Gap
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Solution Overview
Problem
Offset printing blankets face premature failure due to exposure of leading and trailing edges to mechanical impact forces and penetration of ink, solvents, and moisture, which existing solutions fail to adequately address without increasing production costs.
Innovation Solution
A printing blanket construction with contoured, stair-stepped, or beveled leading edges that reduce the gap between edges, eliminating the need for sealants or enhancing their adhesion, thereby protecting against impact forces and moisture penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealant is applied to the end edges of the blanket to prevent moisture penetration, then protection against moisture is improved, but adhesion reliability deteriorates due to minimal surface area and dissimilar materials
Solution Approach 1:
The invention transitions from a two-dimensional edge surface to a three-dimensional contoured structure by forming a ramp or bevel on the leading edge. This dimensional change increases the surface area available for sealant application and creates a stepped configuration that improves mechanical interlocking and adhesion to dissimilar materials, thereby resolving the contradiction between moisture protection and sealant adhesion strength.
2Length of moving object
If filler portion or closure elements are added to reduce printing gap, then gap reduction is improved, but device complexity and production cost increase
Solution Approach 1:
The invention merges the gap-reducing function with the existing blanket plies by forming the contoured edge directly from the top ply material itself, rather than adding separate filler portions or closure elements. This integration eliminates additional components while achieving the desired gap reduction, thereby resolving the contradiction between gap dimension and construction complexity.
Solution Approach 2:
The invention extracts the gap-reducing function from separate filler elements and incorporates it directly into the leading edge geometry of the blanket plies. By removing the need for additional filler components and achieving gap reduction through the inherent shaping of existing materials, the solution simplifies the overall construction while maintaining the length dimension improvement.
3Force
If leading edge is shaped to reduce printing gap, then impact force reduction is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention employs a curved ramp or beveled contour on the leading edge rather than a sharp angular transition. This curved geometry gradually distributes the impact force over a longer period and larger surface area, reducing peak impact forces. The smooth curvature is more tolerant of manufacturing variations compared to sharp angles, thereby resolving the contradiction between impact force reduction and manufacturing precision requirements.
Data Source
AI summary
An improved printing blanket construction is provided which includes at least a top ply, a bottom ply, and a non-extensible backing ply. The blanket includes leading and trailing edges which are secured directly to the backing ply, where at least a portion of the leading edge forms a contoured edge, a stair-stepped edge, a beveled edge, or a combination thereof. The printing blanket construction having such a shaped leading edge reduces printing gap, reduces the impact forces on the leading edge of the blanket, and protects the blanket from the penetration of ink, solvents, moisture and the like into the blanket plies during use.