Solid Polyurethane Adhesive Sheet Application
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Solution Overview
Problem
Liquid polyurethane adhesives are difficult to apply due to running or dripping, leading to unintended adhesion on non-bonding surfaces.
Innovation Solution
Forming a solid polyurethane adhesive by mixing components on non-stick films, applying pressure, allowing solidification, cutting to size, and heating for bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If liquid polyurethane adhesive is used, then the adhesive can be applied to bonding surfaces, but it tends to run or drip and stray onto non-bonding surfaces
Solution Approach 1:
The patent changes the physical state parameter of the adhesive from liquid to solid form. By providing adhesive in a solid state, it eliminates the running and dripping problems associated with liquid adhesives while maintaining effective bonding capability through controlled application and heating activation.
Solution Approach 2:
The patent utilizes phase transition by providing the adhesive as a solid that can be heated to become tacky and then revert to solid upon cooling. This phase change allows the adhesive to be applied in a non-tacky solid state, activated when needed through heating, and set when cooled, preventing stray adhesion during application.
2Strength
If liquid polyurethane adhesive is used, then the adhesive can bond surfaces, but it requires unnecessary efforts to remove adhesive from non-bonding surfaces
Solution Approach 1:
The patent changes the physical state from liquid to solid, allowing precise application only where needed. The solid form prevents adhesive from reaching non-bonding surfaces, eliminating the time-consuming removal process while maintaining strong bonding through controlled activation and curing.
3Ease of operation
If solid polyurethane adhesive is formed, then it is easier to handle and reduces stray adhesion, but it requires heating and pressure application
Solution Approach 1:
The patent employs phase transition by heating the solid adhesive to a tacky state for bonding, then allowing it to cool and revert to solid for permanent setting. This approach simplifies handling during application while achieving strong bonds through the controlled phase change process.
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 solid adhesive is easier to handle and reduces stray adhesion on non-bonding surfaces, improving application precision.
Implementation Method 1
allowing the polyurethane compound to solidify for a first period of time to form a non-tack polyurethane adhesive sheet
Implementation Method 2
heating the cut polyurethane adhesive
Data Source
AI summary
A method for preparing and applying a polyurethane adhesive comprises: mixing a part A component and a part B component of a polyurethane compound; pouring the polyurethane compound onto a first non-stick film positioned on a planar mold; placing a second non-stick film on an upper surface of the polyurethane compound; applying a pressure to the first non-stick film and/or the second non-stick film to give the polyurethane compound a specified thickness; allowing the polyurethane compound to solidify for a first period of time to form a non-tack polyurethane adhesive; cutting the polyurethane adhesive and the two non-stick films according to a size of the mating surfaces of the two objects to be joined together; placing the cut polyurethane adhesive in contact with one of the mating surfaces and hold the other mating surface in contact with the polyurethane adhesive; and heating and applying pressure to the cut polyurethane adhesive.