Variable Thickness Asphalt Shingle Manufacturing
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Solution Overview
Problem
The existing methods for manufacturing asphalt shingles are inefficient in terms of raw material usage, as they apply a uniform layer of asphalt and granules across the shingle mat, leading to excess material being used in non-essential regions.
Innovation Solution
The method involves varying the thickness of the asphalt-coated sheet by using compression rollers or auxiliary coaters to differentiate between prime and headlap portions, allowing for a more precise application of granules and subsequent cutting into shingles, thereby reducing the overall amount of raw materials needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform layer of asphalt and granules is applied across the shingle mat, then the shingle has consistent coverage and protection, but excess material is used in non-essential regions increasing weight and cost
Solution Approach 1:
The patent applies different thicknesses of asphalt coating to different regions of the shingle mat. Prime lanes receive a first thickness of asphalt coating while headlap lanes receive a second, lesser thickness. This local differentiation ensures adequate protection in visible prime areas while reducing material usage in less critical headlap regions that will be covered by overlapping shingles.
2Ease of manufacture
If a uniform layer of asphalt is applied across the shingle mat, then the manufacturing process is simple, but the weight and cost of shingles increase due to excess asphalt
Solution Approach 1:
The patent employs a dynamic coating system where the asphalt application thickness is varied along the width of the shingle mat. The system transitions from a static uniform coating approach to a dynamic variable thickness coating, allowing optimization of shingle weight and material cost while maintaining manufacturing feasibility through controlled variation in coating parameters.
3Reliability
If a uniform layer of granules is applied across the shingle mat, then the protective coverage is consistent, but the amount of granules used increases cost and material waste
Solution Approach 1:
The patent applies granules selectively to only those portions of the asphalt-coated shingle mat that will form prime lanes. By controlling the granule application to match the variable thickness asphalt coating pattern, the system ensures protective coverage is concentrated where needed in visible areas while eliminating unnecessary granule usage in headlap regions.
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 approach reduces the weight and cost of shingles by eliminating excess asphalt, optimizing material distribution, and enabling the production of lighter, more cost-effective roofing shingles.
Implementation Method 1
varying the thickness of the asphalt-coated sheet by passing the asphalt-coated sheet through compression rollers
Implementation Method 2
The drum is configured to press the granules into the granule-covered sheet and remove the granules which are not adhered to the granule-covered sheet
Data Source
AI summary
A method of manufacturing roofing shingles is provided. The method includes the step of coating a continuously supplied shingle mat with roofing asphalt to make an asphalt-coated sheet. The asphalt-coated sheet has at least one prime portion and at least one headlap portion. The thickness of the asphalt-coated sheet is varied by passing the asphalt coated sheet through compression rollers configured to compress the asphalt-coated sheet and form a formed sheet such that the prime portion of the formed sheet has a first thickness and the headlap portion has a second thickness, different from the first thickness. The formed sheet is passed under a film applicator configured to supply a film to the headlap portion thereby forming a filmed sheet. Granules are applied to the filmed sheet to form a granule-covered sheet such that granules do not adhere to the headlap portion. The granule-covered sheet is cut into shingles.