Flexible Foaming Process for Polyurethane Insulation
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Solution Overview
Problem
Existing production processes for thermally insulating polyurethane foam articles require frequent changes and cleaning of feeding tubes and mixing heads to accommodate different components and ambient conditions, leading to raw material waste and increased capital expenditures.
Innovation Solution
A discontinuous process that adjusts the mixing ratios of three streams (isocyanate reactive compounds, organic polyisocyanates, and additional compounds like catalysts and blowing agents) to produce different polyurethane foams without changing the feeding tubes or mixing heads, using a control unit to manage the feeding of these streams into a mixing device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feeding tubes and mixing heads are changed and cleaned to accommodate different components, then polyurethane foam quality can be maintained, but raw material is wasted and production time is lost
Solution Approach 1:
The system dynamically adjusts the mixing ratios of streams (A), (B), and (C) based on the desired polyurethane foam properties. By making the mixing ratios variable rather than fixed, the system can produce different foam types without changing the physical feeding tubes and mixing heads, thus eliminating the need for cleaning and material waste.
Solution Approach 2:
The invention changes the operational parameters (mixing ratios of components A, B, and C) to produce different polyurethane foam formulations. This parameter-based adjustment allows the same equipment to produce varied foam products by simply modifying the proportion of streams mixed, rather than physically changing or cleaning the feeding system.
2Reliability
If feeding tubes and mixing heads are changed and cleaned for different components, then correct component delivery is ensured, but production time is lost
Solution Approach 1:
The feeding tubes and mixing heads are designed to be universal components that can handle multiple different polyurethane foam formulations. By making these components multi-functional through the ability to vary mixing ratios of streams (A), (B), and (C), the system eliminates the need for frequent changes and cleaning, thus preventing production time loss while maintaining component delivery accuracy.
Solution Approach 2:
The system uses dynamic mixing ratio adjustment to adapt to different component requirements. This dynamic capability allows the same feeding system to accurately deliver different component proportions for various foam types without requiring physical changes or cleaning, thereby maintaining reliability while preserving production time.
3Ease of manufacture
If multiple tank farms are installed for different components, then cleaning efforts are reduced, but capital expenditures increase
Solution Approach 1:
Instead of installing multiple tank farms for different components, the invention achieves formulation flexibility by changing the mixing ratios of streams (A), (B), and (C). This parameter-based approach eliminates the need for additional storage infrastructure, reducing capital expenditures while maintaining ease of manufacture by avoiding frequent cleaning of multiple tanks.
Solution Approach 2:
The system employs universal feeding tubes and mixing heads that can handle all component streams (A), (B), and (C) for different polyurethane foam formulations. This multi-functionality reduces the need for multiple specialized tank farms, thereby lowering capital expenditures while keeping cleaning efforts manageable through a streamlined single-system approach.
4Adaptability or versatility
If mixing ratios of streams (A), (B), and (C) are adjusted, then different polyurethane foams can be produced, but process complexity increases
Solution Approach 1:
The invention achieves different polyurethane foam varieties by adjusting the mixing ratios of streams (A), (B), and (C). This parameter change approach allows versatile foam production using a single, relatively simple mixing process, avoiding the need for complex multiple-stream systems or additional equipment, thus maintaining low process complexity while achieving high adaptability.
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
Enables the production of various thermally insulating polyurethane foam articles on a single production line without the need for cleaning or changing equipment, reducing waste and capital expenditures while maintaining consistent processing quality.
Implementation Method 1
Components (A) and (B) are carefully designed by selecting specific combinations of ingredients like different polyols, isocyanates, catalysts, blowing agents, surfactants etc. to yield polyurethane foams showing the property profiles required
Implementation Method 2
A discontinuous process that adjusts the mixing ratios of three streams (isocyanate reactive compounds, organic polyisocyanates, and additional compounds like catalysts and blowing agents) to produce different polyurethane foams
Implementation Method 3
a third stream (C) comprising at least one compound selected from isocyanate reactive compounds, organic polyisocyanates, catalysts, blowing agents, chain extenders, stabilizers, crosslinkers, flame retardants, and additives
Data Source
AI summary
A flexible discontinuous process produces a series of at least two articles containing thermally insulating polyurethane foam from at least three streams (A), (B) and (C). The process involves mixing the at least three streams with different mixing ratios and injecting the mixture into cavities of the articles. A production unit can be used for performing this process.