Self-Sealing End Seal Insert to Prevent Solvent Delamination
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Solution Overview
Problem
Existing seals in flexography printing are difficult to adjust, have limited life due to ink and solvent exposure, and rely on adhesives that degrade, leading to delamination and reduced reliability.
Innovation Solution
The end seal with a self-sealing insert features a flexible body and a stiffer insert with protruding posts or legs that match the anilox roller's radius, preventing ink and solvent accumulation by sealing holes in the body, reducing the need for adhesives and simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the insert is recessed into the body, then the assembly appears more integrated, but this creates a reservoir that accumulates ink and chemicals, damaging the seal and reducing reliability
Solution Approach 1:
Instead of recessing the insert into the body as done in prior art, this invention inverts the arrangement by having the insert protrude from the body. The insert extends beyond the body's outer surface, eliminating the ink-trapping reservoir that would form with a recessed design. This inversion solves the reliability problem while maintaining a clean integrated appearance.
Solution Approach 2:
The invention converts the potential harm of ink accumulation into a benefit by designing the insert to protrude, which prevents ink and chemicals from entering the bond line between the insert and body. The area that would traditionally be a harmful reservoir is instead designed to exclude harmful substances, protecting the adhesive bond and extending seal life.
2Ease of manufacture
If adhesives are used to bond the insert to the body, then assembly is simplified, but adhesives degrade due to solvent exposure, causing delamination
Solution Approach 1:
This invention extracts the adhesive from the bonding process by using a mechanical interference fit between the insert and body. The insert includes features such as tapered surfaces and retention ribs that create friction and mechanical interlocking, eliminating the need for solvent-based adhesives that would degrade in the ink chamber environment.
Solution Approach 2:
The invention replaces the chemical bonding system (adhesives) with a mechanical bonding system (interference fit, friction, and mechanical interlocking features). This substitution eliminates the sensitivity to solvents and chemicals, providing a more reliable and durable bond in the harsh ink chamber environment.
3Ease of operation
If a flexible body is used for the seal, then adjustability is improved, but the body wears quickly due to contact with the rotating anilox roller
Solution Approach 1:
This invention applies local quality by using different materials for different parts of the seal. The body is made of a softer, more compliant material that provides adjustability and sealing, while the insert is made of a harder, more wear-resistant material that contacts the rotating anilox roller. This local differentiation allows each part to optimize its function without compromising the other.
Solution Approach 2:
The invention uses composite construction by combining two different materials: a flexible body material (such as rubber or polymer) and a wear-resistant insert material (such as ceramic, carbide, or hardened steel). This composite structure allows the seal to simultaneously achieve adjustability through the flexible body and extended life through the wear-resistant insert.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances adjustability, extends seal life by preventing ink and solvent accumulation, and reduces manufacturing costs while maintaining reliability and durability.
Implementation Method 1
a flexible, or compressible body
Implementation Method 2
flexible, or compressible body
Implementation Method 3
a stiffer insert to reduce wear caused by the rotating anilox roller
Implementation Method 4
The insert, when under pressure, seals the holes in the body, preventing introduction and accumulation of ink and cleaning chemicals
Data Source
AI summary
The end seal with self-sealing insert includes a flexible, or compressible body, and a stiffer insert to reduce wear caused by the rotating anilox roller. The end seal with self-sealing insert places the recesses within the body beneath an expanded insert. The insert, when under pressure, seals the holes of the body, preventing introduction and accumulation of solvents. The result is a degradation-resistant end seal. By having extensions, also referred to as posts or legs, protruding from the insert that pass into the body, the reliance on adhesives is avoided. The reduction of the use of adhesives is helpful because adhesives are sensitive to solvents used in ink and to cleaning solutions. In the preferred embodiment, circular posts extend downward from the insert, passing into circular holes in the body.