Bitumen-Impregnated Fiber Roofing Coating for Fire Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for improving the fire behavior of cellulose fiber roofing elements impregnated with bitumen, such as using graphite, are complicated and difficult to integrate into existing production lines due to the need for specialized equipment and uneven distribution of graphite particles.
Innovation Solution
A process involving a liquid composition with a fire-retardant additive comprising graphite and colemanite, which is applied using a roller coating method to cellulose fiber mats before impregnation with bitumen, simplifying the manufacturing process and allowing for controlled application and better incorporation of the additive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If graphite particles are spread by dry process on the surface of roofing elements, then fire behavior is improved, but the equipment becomes complex and difficult to adjust
Solution Approach 1:
The patent combines the fire-retardant graphite application with the existing liquid composition coating step. The graphite is incorporated into the liquid composition that is already being applied to the fiber mat, merging two separate operations (coating and fire protection) into one unified process step, thereby eliminating the need for separate graphite spreading equipment
Solution Approach 2:
The liquid composition acts as an intermediary carrier that facilitates the uniform distribution of graphite particles. Instead of applying graphite directly as dry particles, it is suspended and delivered through the liquid composition medium, which simplifies the application mechanism and integrates it with existing coating infrastructure
2Reliability
If graphite particles are spread by dry process on shaped elements, then fire behavior is improved, but the distribution becomes uneven over the entire surface
Solution Approach 1:
The coating and graphite application are merged into a single simultaneous operation. The liquid composition containing graphite is applied in one step, ensuring uniform distribution across the surface without the complications of sequential dry particle spreading on shaped surfaces
Solution Approach 2:
The liquid composition delivery system utilizes fluid dynamics principles to achieve uniform distribution. The liquid medium flows and distributes the suspended graphite particles evenly across the surface through controlled application, leveraging the properties of liquids for homogeneous coverage
3Reliability
If specialized equipment is used for graphite spreading, then fire behavior is improved, but installation within existing production line becomes difficult
Solution Approach 1:
The fire protection function is merged with the existing liquid composition coating operation. By incorporating graphite into the liquid composition that is already part of the production line, the system leverages existing infrastructure rather than requiring separate specialized equipment, thereby simplifying installation and integration
Solution Approach 2:
The liquid composition serves multiple functions: it acts as a binder/coating material and simultaneously serves as a carrier for the fire-retardant graphite particles. This multi-functionality eliminates the need for dedicated graphite application equipment and allows the existing coating system to fulfill both roles
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 enhances fire resistance while simplifying the manufacturing process, allowing for uniform application and improved fire protection of roofing elements, with the cooling agent colemanite controlling temperature during the drying process to prevent fiber damage.
Implementation Method 1
an additive having anti-fire properties and comprising at least graphite and a cooling agent which is colemanite
Implementation Method 2
an additive having fire-retardant properties and comprising at least graphite
Implementation Method 3
The coating is carried out by a liquid composition... using a roller coating method
Data Source
Figure 1
AI summary
The invention concerns a method for producing a covering element made from natural fibres, in particular cellulose, impregnated with bitumen, comprising a step of coating at least one of two faces of a fibre mat (4) followed by a step of impregnating with bitumen, the coating being carried out with a liquid composition (5) comprising at least one resin and/or at least one pigment. The liquid composition is a dye composition comprising at least one pigment and at least one resin, and the method involves adding an additive to the liquid composition (5), said additive having fireproof properties and comprising at least graphite and a cooling agent. Preferably, the mat (4) is coated with the liquid composition comprising the fireproof additive using a roller.