Two-Component Spray Foam Device with Forced Mixer
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Solution Overview
Problem
Existing fire protection foam systems, particularly two-component mixtures, face issues with storage stability, inhomogeneous mixing, and difficulty in application due to viscosity differences between components, leading to incomplete sealing and inadequate fire protection in both new and retrofitted constructions.
Innovation Solution
A two-component spray foam application device using separate pressure cans for polyisocyanate and polyol components with finely divided flame retardants, featuring a holder and dispensing aid with adjustable bores to match viscosities and a compulsory mixer for on-site, one-handed operation, ensuring stable storage and homogeneous mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If larger quantities of fire-resistant materials are added to the foams, then fire protection effectiveness is improved, but storage stability deteriorates and sedimentation occurs
Solution Approach 1:
The fire protection foam system is divided into two separate components stored in different pressure cans: Component A (polyisocyanate) and Component B (polyol with mineral flame retardants). This segmentation prevents the mineral additives from sedimening during storage while allowing effective fire protection when mixed and applied.
Solution Approach 2:
The flame retardant materials are pre-loaded into Component B in finely divided form suspended in polyol, ready for immediate use. The components are prepared separately with optimal formulations, and mixing occurs automatically at the point of application through the forced mixer, ensuring both storage stability and fire protection effectiveness.
2Stability of the object's composition
If two-component cartridge foams are used to separate components, then storage stability is improved, but mixing homogeneity deteriorates due to viscosity differences
Solution Approach 1:
The application device incorporates a forced mixer with rotors and stators that dynamically mix Components A and B during dispensing. The mixing intensity and efficiency are optimized to handle the viscosity differences between the low-viscosity polyisocyanate and high-viscosity polyol with mineral additives, ensuring homogeneous mixing throughout the application process.
Solution Approach 2:
The system uses different bore sizes for the two components in the application aid (0.3-2.0 mm for Component A, 1.5-4.0 mm for Component B) to adapt to their respective viscosities. This parameter adjustment ensures that both components are delivered in the correct proportions and mixed homogeneously, overcoming the viscosity mismatch problem.
3Ease of operation
If mechanical application is used to compensate for viscosity differences, then application capability is improved, but device complexity increases
Solution Approach 1:
The holder device serves multiple functions: it stores both pressure cans, provides forced mixing through rotors and stators, controls dispensing through a trigger mechanism, and adapts to different viscosities through adjustable bore sizes. This multi-functionality integrates what would otherwise require separate devices into a single unified system that is both capable and relatively simple to use.
Solution Approach 2:
The application device merges the storage cans, mixing mechanism, dispensing control, and application aid into a single integrated holder system. The pressure cans, hoses, forced mixer, and application aid with different bore sizes are combined into one unit that operates through a single trigger mechanism, simplifying the overall system while maintaining application capability.
4Loss of substance
If cartridges are designed to be completely emptied, then material utilization is improved, but viscosity increase towards the end prevents complete emptying
Solution Approach 1:
The forced mixer continuously agitates both components during dispensing, preventing viscosity increase and sedimentation even as the cans are emptied. The dynamic mixing action maintains consistent flow characteristics throughout the entire application process, allowing the cartridges to be completely emptied without the viscosity problems that plague static systems.
5Ease of operation
If one-handed operation is enabled for ease of use, then ease of operation is improved, but mixing control may deteriorate
Solution Approach 1:
The system is designed to be self-mixing through the forced mixer mechanism that automatically activates when the trigger is pulled. The operator simply needs to press the trigger with one hand, and the system automatically draws both components through hoses, mixes them in the forced mixer, and dispenses the foam. This self-service mechanism eliminates the need for manual mixing control while maintaining precise mixing ratios through the designed bore sizes and pressure balance.
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 system allows for quick, easy, and professional sealing of joints and wall openings, providing effective fire protection by ensuring complete mixing and efficient foam application, even in existing constructions, while maintaining component stability and preventing premature reaction.
Implementation Method 1
a first pressure can with a component A containing a polyisocyanate and a first propellant component, a second pressure can with a component B containing at least one flame retardant in finely divided form suspended in a polyol component, and a second propellant component
Implementation Method 2
a forced mixer which mixes components A and B when the application aid is activated
Implementation Method 3
the at least one flame retardant is expandable graphite
Implementation Method 4
the at least one flame retardant is expandable graphite
Data Source
AI summary
The invention relates to an application device for a two-component spray foam for fire protection, comprising a first pressure canister having a component A, containing a polyisocyanate and a first propellant-gas component, a second pressure canister having a component B, containing at least one flameproofing agent in a fine-particle form, suspended in a polyol component, and a second propellant-gas component, a retainer for the first and the second pressure canister, wherein the retainer has a valve receptacle for each of the pressure canisters, and a dispensing aid for the spray foam, which is connected to the valve receptacles for the pressure canisters by means of hose lines, such as a forced mixer, which mixes components A and B while the dispensing aid is activated.