Metal-Back Printing Blanket Elastomer Adhesion
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Solution Overview
Problem
Existing metal-backed printing blankets face issues with thermal degradation, chemical resistance, and mechanical flexibility, leading to thickness fluctuations and print quality deterioration due to the use of hot-melt adhesives and rigid plastic films, which fail to adapt to dynamic mechanical loads during the printing process.
Innovation Solution
An elastomer layer acts as an irreversible adhesive between the metal foil and the cover layer, providing elastic and cushioning properties to withstand thermal loads and chemical attacks, and is reinforced with resorcinol-based resin systems and isocyanate compounds for enhanced adhesion, allowing for compressibility and mechanical interlocking with the printing cylinder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hot-melt adhesive is used to connect the plastic film to the metal foil, then the adhesive bond is easy to create, but the adhesive melts under thermal loads and causes detachment of the plastic film
Solution Approach 1:
The patent changes the material parameter of the adhesive layer from thermoplastic (hot-melt) to elastomeric. The elastomer layer maintains adhesive properties while resisting melting under thermal loads up to 80°C, thereby resolving the contradiction between ease of bonding and thermal stability.
Solution Approach 2:
The patent uses a composite structure where the elastomer layer combines adhesive functionality with thermal resistance. This composite material approach allows the adhesive layer to simultaneously provide bonding ease and maintain integrity under thermal stress.
2Device complexity
If plastic film and adhesive are used as cover layer, then the connection is simple, but the materials are incompressible and rigid causing thickness fluctuations and detergent penetration
Solution Approach 1:
The patent replaces the rigid plastic film with an elastomeric cover layer that possesses flexibility and compressibility. This flexible structure can deform under compression during printing, maintaining thickness consistency and preventing detergent penetration while remaining relatively simple in construction.
Solution Approach 2:
The patent changes the mechanical parameters of the cover layer from rigid and incompressible to elastic and compressible. The elastomer's ability to compress and rebound maintains uniform thickness under varying printing pressures, resolving the precision issue while keeping the structure simple.
3Device complexity
If rigid plastic film is used as cover layer, then the structure is simple, but it cannot adapt to dynamic-mechanical requirements and causes print interruptions
Solution Approach 1:
The patent introduces dynamic properties to the cover layer by using elastomer material that can adapt its stiffness and compression in response to varying mechanical loads during printing. This dynamic adaptation allows the simple structure to handle different printing conditions without interruptions.
Solution Approach 2:
The patent changes the mechanical parameters of the cover layer from rigid to elastic, enabling the material to dynamically adjust to varying printing pressures and speeds. This parameter change provides adaptability to different machine configurations while maintaining structural simplicity.
4Ease of manufacture
If hot-melt adhesive is used, then bonding is easy to achieve, but chemical attack from detergents causes degradation of the adhesive-plastic composite
Solution Approach 1:
The patent changes the chemical composition of the adhesive layer from hot-melt adhesive to elastomer, which provides superior resistance to chemical attack from printing detergents while maintaining ease of bonding through irreversible adhesion.
Solution Approach 2:
The patent uses elastomer as a composite material that combines adhesive properties with chemical resistance. This material resists degradation from hydrocarbon-containing solvents and printing detergents while providing reliable bonding between the metal foil and cover layer.
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
The solution ensures reliable adhesion, maintains print quality by compensating for varying pressures and speeds, reduces corrosion, and provides logistical advantages by using the same rubber for both layers, resulting in improved thickness consistency and process stability.
Implementation Method 1
The layer has elastic and cushioning properties, which allows it to be adapted to the requirements of the printing process. By using the elastic layer, which can also be compressed to a certain extent, it can now be achieved that the different speed ranges and pressures (indentations) are compensated for
Implementation Method 2
In order to give the elastomer layer adhesive properties, different resins, e.g. B. phenolic resins, epoxy resins, MFH, urea resins, alkyd resins, polyester resins, polyurethane resins, polyamide resins, vinyl ester resins, resorcinol resins or formaldehyde resins. It has proven to be advantageous if the elastomer layer acting as an adhesive layer is a resin system based on resorcinol, e.g. B. RFL, and/or contains an isocyanate compound
Data Source
AI summary
Metal backing blanket (2) comprising at least the following layers: - a printing layer (4), - a metal foil (10), - a cover layer (12) which is connected to the surface of the metal foil (10) facing away from the printing layer, wherein the cover layer (12) is irreversibly connected to the metal foil (10) via at least one elastomer layer (14) acting as an adhesive layer.