Heat-Activatable Sealant for Corrosion-Resistant Joints
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Solution Overview
Problem
Existing methods for forming hem flanges in automobile manufacturing are time-consuming, result in joints of variable quality with irregularities and unsightly sections, and require multiple materials for sealing and corrosion protection, leading to weaknesses and aesthetic issues.
Innovation Solution
A method using a heat-activatable and expandable sealant material applied to one or both surfaces to be joined, which extends beyond the bond area, activating to form a uniform protective layer and bond the surfaces together, eliminating the need for additional surface finishes and wax protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional multi-material sealing method is used, then corrosion protection is provided, but the process is time-consuming and produces variable quality joints with irregularities
Solution Approach 1:
The patent combines multiple sealing materials (adhesive, paintable covering layer, and protective wax layer) into a single integrated heat-activatable sealant composition. This unified material performs bonding, sealing, and corrosion protection functions simultaneously, eliminating the need for separate application steps and reducing manufacturing time while maintaining reliable corrosion protection.
Solution Approach 2:
The heat-activatable sealant composition is designed to perform multiple functions: it bonds the panels together, seals the joint to prevent moisture ingress, and provides corrosion protection. This multi-functional material replaces the traditional multi-material system, streamlining the process while ensuring reliable protection.
2Reliability
If traditional multi-material sealing method is used, then corrosion protection is provided, but the joint appearance is unsightly with irregularities
Solution Approach 1:
By merging the adhesive, covering layer, and protective layer into a single sealant composition, the patent eliminates the irregularities and unsightly sections that occur when multiple materials are applied separately. The unified material provides a uniform, consistent appearance while maintaining effective corrosion protection.
3Productivity
If heat-activatable sealant is used, then rapid uniform joint formation is achieved, but the sealant must extend beyond the bond area requiring control
Solution Approach 1:
The sealant composition is designed with specific rheological properties that allow it to remain in place during application and positioning, then flow uniformly when heated. This local control of material behavior enables rapid joint formation while maintaining precision in the bond area.
Solution Approach 2:
The sealant's physical properties change with temperature: it remains viscous at room temperature for easy application and positioning, then becomes flowable when heated to fill the joint uniformly. This parameter change enables both precise application control and rapid uniform joint formation.
4Strength
If sealant material is applied to bond panels, then bonding is achieved, but additional materials are needed for surface finish and corrosion protection
Solution Approach 1:
The heat-activatable sealant composition is formulated to provide bonding, sealing, and corrosion protection in a single material. This eliminates the need for separate adhesive, covering layer, and protective wax layer applications, reducing the quantity of materials needed while maintaining strong bonds and effective protection.
Solution Approach 2:
The patent merges the functions of multiple materials (adhesive for bonding, paintable covering for surface finish, and wax for corrosion protection) into a single integrated sealant composition, simplifying the material system while achieving all required functions.
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 method enables rapid, uniform joint formation with improved appearance and corrosion resistance, reducing voids and irregularities, and allowing for better control over the sealant application, resulting in a stronger and more aesthetically pleasing bond.
Implementation Method 1
heat activatable and expandable sealant material... once assembled the heat activatable material is activated to bond the surfaces together
Implementation Method 2
heat activatable and expandable sealant material... the sealant material is then exposed to heat or other energy source causing the structural material to flow, fill, and cure
Data Source
AI summary
Surfaces 1, 2 are bonded together by a heat activated adhesive 3 that is applied to a surface 2 to cover an area greater than the area that is to form the bond, the two surfaces 1, 2 are brought together and the adhesive 3 activated so that it creates the bond and also covers the exposed edges of the surfaces to provide an aesthetically pleasing and coatable corrosion and rust protective layer.