Polyurethane Foam Layer Adhesion via Polymerization Foaming
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for adhering multiple polyurethane foam layers together face issues such as environmental damage, insecure adhesion, reduced production efficiency, and limited production sizes due to the use of adhesives, which also complicate the foaming process and restrict the size of the final product.
Innovation Solution
A method utilizing a polymerization foaming reaction with polyurethane system components, comprising an isocyanate and polyol mixture, where the components are applied and mixed with water and a catalyst to create carbon dioxide, allowing for secure adhesion and enhanced production capacity, even with layers of different properties, while minimizing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is used to adhere multiple polyurethane foam layers together, then the layers can be joined, but it causes environment damage and produces harmful factors
Solution Approach 1:
The invention extracts and eliminates the adhesive substance from the foam layer structure. Instead of using adhesive to join layers, the patent creates a unified foam structure where multiple foam layers are formed simultaneously through controlled foaming, removing the harmful adhesive component entirely while maintaining structural integrity
Solution Approach 2:
The invention introduces a transition layer or interface region between foam layers formed during the foaming process itself. This intermediary zone is created through controlled diffusion and interaction of polyurethane components between adjacent foam layers, providing natural adhesion without external adhesives
2Adaptability or versatility
If multiple polyurethane foam layers are foamed separately and then adhered together using adhesive, then each layer can be formed independently, but production efficiency is reduced and the process becomes complicated
Solution Approach 1:
The invention merges the foaming processes of multiple layers into a single simultaneous operation. Multiple polyurethane foam layers are formed together in one continuous foaming process, with each layer maintaining its intended properties while being created in unison, eliminating sequential processing steps
Solution Approach 2:
The invention applies polyurethane system components to the surface of existing foam layers before complete foaming occurs. This preliminary application allows subsequent layers to bond chemically and physically during the foaming process itself, preparing the interface for adhesion before the layers are fully formed
3Reliability
If adhesive is clad on multiple polyurethane foam layers after foaming, then the layers can be adhered together, but the production process becomes troublesome and complex
Solution Approach 1:
The polyurethane system components are applied to the foam layer surface during or immediately after foaming while the foam is still warm and reactive. This preliminary application allows the components to penetrate and bond with the foam structure before final cooling, integrating the adhesion function into the foaming process itself
Solution Approach 2:
The polyurethane system components on the foam layer surface self-bond with subsequent layers through the foaming and curing process. The chemical reactions and physical changes during foaming automatically create strong adhesion between layers without requiring external adhesive application or additional bonding equipment
4Reliability
If adhesive is used to adhere multiple polyurethane foam layers together, then the layers can be joined, but the adhesion is not secure and reliable
Solution Approach 1:
The invention creates a composite structure where polyurethane system components form an integrated transition zone between foam layers. This composite interface combines chemical bonding through polyurethane polymerization with mechanical interlocking, producing stronger adhesion than surface-applied adhesives can achieve
Solution Approach 2:
A transition layer of polyurethane system components is formed at the interface between foam layers, acting as a chemical intermediary that bonds both layers together. This intermediary zone provides gradual property transition and strong chemical adhesion, eliminating the weak interface problem of adhesive-based joining
5Reliability
If adhesive is clad on multiple polyurethane foam layers after foaming, then the layers can be adhered together, but the production size is limited
Solution Approach 1:
Polyurethane system components are applied to large foam layer surfaces during or immediately after foaming while the material is still reactive. This timing allows the components to penetrate and bond across the entire surface area simultaneously, enabling production of large-scale foam structures without adhesive application limitations
Solution Approach 2:
The polyurethane system components on the foam surface self-bond with subsequent layers through the foaming and curing process, enabling adhesion of large-area foam layers without requiring adhesive distribution equipment or manual application. The chemical bonding occurs automatically across the entire interface area
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 effectively adheres multiple polyurethane foam layers securely, enhances production efficiency, and allows for larger product sizes without environmental damage, by using a polymerization foaming reaction with adjustable thickness control and heating to complete the polymerization process.
Implementation Method 1
a polymerization foaming reaction with polyurethane system components, comprising an isocyanate and polyol mixture, where the components are applied and mixed with water and a catalyst to create carbon dioxide
Implementation Method 2
the water and the isocyanate component are mixed to produce carbon dioxide by which the polyurethane foam layer is foamed
Implementation Method 3
the components are applied and mixed with water and a catalyst to create carbon dioxide, allowing for secure adhesion and enhanced production capacity
Data Source
AI summary
A method of adhering multiple polyurethane foam layers together sticks a first polyurethane foam layer with a second polyurethane foam layer by using polyurethane system components in polymerization foaming reaction. The method contains steps of: A. delivering the first polyurethane foam layer toward a cladding position; B. cladding or depositing the polyurethane system components on the first polyurethane foam layer at the cladding position so that the polyurethane system components start foaming polymerization on and adhere with the first polyurethane foam layer; C. delivering the polyurethane system components and the first polyurethane foam layer to a press roller so that the polyurethane system components foam to produce the second polyurethane foam layer, and the second polyurethane foam layer adheres with the first polyurethane foam layer; and D. conveying the second polyurethane foam layer and the first polyurethane foam layer away from the press roller.