PUR Adhesive Green Strength for Door Component Positioning
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Solution Overview
Problem
The door manufacturing process faces challenges such as warping of skins due to temperature or humidity, inaccurate application of components, and incomplete bonding, leading to defects and quality issues in assembled doors.
Innovation Solution
The use of a polyurethane reactive (PUR) adhesive with specific viscosity, open time, and temperature, applied in controlled amounts and timings during the assembly process, to achieve green strength quickly and maintain component position, thereby minimizing defects and ensuring quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional adhesives are used in door assembly, then the assembly process is simple, but the bonding is incomplete and components shift during assembly
Solution Approach 1:
The patent changes the parameters of the adhesive by using a polyurethane reactive adhesive with specific viscosity (4600-7000 cPs), open time (40-60 seconds), and temperature (275-300°F) to achieve rapid bonding strength while maintaining assembly simplicity
Solution Approach 2:
The patent replaces mechanical fastening methods with a chemically bonded adhesive system that achieves green strength quickly, eliminating the need for mechanical fasteners and reducing assembly complexity
2Stability of the object's composition
If adhesive is applied quickly to prevent component movement, then component position is maintained, but bonding strength may be insufficient
Solution Approach 1:
The patent utilizes the phase transition and chemical reaction of the polyurethane reactive adhesive, which transitions from a viscous state to a bonded state through chemical reaction, achieving both rapid positioning and sufficient bonding strength
Solution Approach 2:
The patent uses a composite adhesive system combining polyurethane reactive components with specific additives to achieve both quick green strength for position stability and sufficient bonding strength for permanent attachment
3Strength
If adhesive viscosity is increased to improve bonding, then bonding strength increases, but application becomes difficult and timing is reduced
Solution Approach 1:
The patent optimizes the adhesive viscosity parameter to a specific range (4600-7000 cPs) that balances bonding strength with application ease, allowing adequate spreadability and positioning time while maintaining strong bonding
4Manufacturing precision
If adhesive open time is extended to allow component positioning, then positioning accuracy improves, but adhesive may skin over before assembly is complete
Solution Approach 1:
The patent sets the open time parameter to 40-60 seconds, which is sufficient for component positioning and assembly but short enough to prevent skin over, maintaining both positioning accuracy and bonding reliability
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 adhesive achieves rapid bonding strength, preventing movement of door components during assembly, reducing defects, and ensuring consistent quality in door construction.
Implementation Method 1
The adhesive achieves rapid bonding strength, preventing movement of door components during assembly
Implementation Method 2
The use of a polyurethane reactive (PUR) adhesive with specific viscosity, open time, and temperature, applied in controlled amounts and timings during the assembly process, to achieve green strength quickly and maintain component position
Data Source
AI summary
Doors, systems and methods of making the same are described, including use of an adhesive that is capable of achieving green strength in a predetermined time, including for exemplary automated embodiments, to prevent movement of the components relative to each other.