Laminated Steel Sheet Bonding With Delayed UV Curing
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Solution Overview
Problem
The manufacturing process of laminated steel sheets is inefficient due to the slow curing of adhesives between thin steel sheets, leading to low production efficiency and a risk of sheet peeling, and existing methods struggle to control the curing state when using multiple resin compositions.
Innovation Solution
A method involving a curable composition with delayed curability, which is irradiated with energy rays to cure after a predetermined time, along with a manufacturing apparatus that includes steps of punching, applying the composition, and fixing the sheets, ensuring a stable cured state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesives (epoxy resin composition or (meth)acrylic resin composition) are used for manufacturing laminated steel sheets, then the adhesive can be applied between thin steel sheets, but the curing time is too long which reduces production efficiency and creates a risk of sheet peeling
Solution Approach 1:
The patent changes the curing parameters of the adhesive by using a two-component system (resin composition and curing accelerator) that reacts upon contact. This transforms the curing process from a slow thermal or anaerobic cure to a rapid chemical reaction, reducing curing time from hours to seconds while ensuring complete bonding stability.
Solution Approach 2:
The patent applies the resin composition and curing accelerator to separate surfaces before lamination, so that the curing reaction begins immediately upon contact. This preliminary preparation ensures that the adhesive starts curing at the moment of bonding, preventing sheet peeling while maintaining fast production speed.
2Productivity
If a curing accelerator is added to processing oil to accelerate curing, then the curing speed increases, but it becomes difficult to control the curing state when using multiple resin compositions mixed with processing oil
Solution Approach 1:
The patent segments the adhesive system into two separate components: the resin composition applied to one surface and the curing accelerator applied to the other surface. This segmentation prevents premature mixing and allows independent control of each component, simplifying the management of curing states even when multiple resin compositions are used.
Solution Approach 2:
The patent introduces a thin film or layer as an intermediary between the resin composition and curing accelerator, allowing controlled interaction at the interface. This intermediary layer enables precise control of the curing reaction by regulating how and where the two components meet, making the process manageable even with multiple resin types.
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 approach allows for the stable and efficient production of laminated steel sheets by achieving a cured adhesive state in a short time, improving production efficiency and reducing the risk of sheet peeling.
Implementation Method 1
a curable composition with delayed curability, which is irradiated with energy rays to cure after a predetermined time
Data Source
AI summary
A method is for manufacturing a laminated steel sheet comprising laminated a predetermined number of thin steel sheets formed by punching a belt-shaped thin steel sheet into a predetermined shape. This method includes the following steps 1 to 3: step 1: a step of sequentially punching the thin steel sheet into a predetermined shape with a metallic die; step 2: a step of applying a curable composition to a predetermined portion of the thin steel sheet; and step 3: a step of irradiating the curable composition with energy rays. The curable composition is a delayed curable composition which is cured after a lapse of a predetermined time after being irradiated with energy rays.