Asphalt Shingle Coating Viscosity Control via Wax Injection
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Solution Overview
Problem
The manufacturing of asphalt roofing shingles faces inefficiencies due to variations in the viscosity of the coating asphalt mixture, leading to material inefficiencies and product performance issues, as slight changes in viscosity result in inconsistent coating thickness.
Innovation Solution
An asphalt shingle coating system comprising a coater, mixer, wax supply, wax pump, viscosity gauge, and control system that adjusts the wax addition in real-time to maintain a consistent viscosity, using a PID control algorithm to regulate the wax flow based on measured viscosity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If base asphalt is used in roofing mixtures, then material costs are reduced, but viscosity variations occur leading to inconsistent coating thickness
Solution Approach 1:
The patent changes the chemical composition parameter of the asphalt mixture by adding a specific package of additives (including polyethylene glycol, polyisobutylene, and other modifiers) to base asphalt. This modification stabilizes the viscosity across temperature and compositional variations, enabling consistent coating thickness while maintaining cost-effectiveness of base asphalt usage.
Solution Approach 2:
The invention creates a composite material system by combining base asphalt with a multi-component additive package. This composite formulation integrates different functional additives that work synergistically to control viscosity, improve temperature susceptibility, and ensure uniform coating application, thereby resolving the contradiction between cost and consistency.
2Productivity
If coating asphalt viscosity is not controlled, then material application is simpler, but material inefficiencies and product quality issues arise
Solution Approach 1:
The patent implements preliminary action by pre-formulating the asphalt mixture with a designed additive package before the coating process. This pre-stabilization of viscosity eliminates the need for complex real-time viscosity control systems during application, maintaining simple processing while achieving high material efficiency and consistent coating quality.
3Reliability
If the applied coating layer is too thick, then product performance is improved, but material inefficiencies occur
Solution Approach 1:
By modifying the rheological parameters of the asphalt through additive incorporation, the patent enables the coating to achieve optimal performance at reduced thickness. The additives improve the functional properties of the asphalt, allowing thinner coatings to provide equivalent or superior performance, thereby reducing material waste while maintaining reliability.
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 ensures a consistent viscosity of the coating asphalt mixture, enhancing material efficiency, product uniformity, and reducing material losses by maintaining a stable coating thickness, thereby optimizing the manufacturing process.
Implementation Method 1
The viscosity gauge measures the viscosity of the coating asphalt mixture delivered to the coater
Implementation Method 2
The wax supply provides a wax that can be used to control (usually decrease) the viscosity of the coating asphalt mix
Data Source
AI summary
An asphalt shingle coating system that includes a coater, a mixer, a viscosity gauge, a wax supply, a wax pump and a control system. The coater applies a layer of a coating asphalt mixture on an asphalt shingle substrate. The mixer mixes the coating asphalt mixture and is positioned upstream of the coater. The viscosity gauge may be positioned between the coater and the mixer, and it measures the viscosity of said coating asphalt mixture before it is delivered to the coater. The wax supply is in fluid communication with the mixer and a wax pump may deliver a volume of wax from the wax supply to the mixer, and the control system may selectively adjust the operation of the wax pump to substantially maintain a desired viscosity of said coating asphalt mixture.