Bituminous Membrane Rib Coating for Lower-Cost Full Adhesion
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Solution Overview
Problem
Existing bitumen membranes with patterned grooves and ribs are limited in optimization for specific purposes due to the material identity between ribs and the underlying layer, leading to inefficiencies and higher production costs, especially with self-adhesive membranes where the entire surface requires expensive self-adhesive material and release film issues.
Innovation Solution
A method where a uniform bitumen compound layer is applied to a carrier, and ribs are formed by additional applied material, allowing the ribs to differ in material from the underlying layer, with only the ribs being self-adhesive and using less expensive material for the underlying layer, and ribs being relatively thin for full-surface adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire surface is made of self-adhesive material, then adhesion performance is improved, but production cost increases
Solution Approach 1:
The patent applies self-adhesive material only to the ribs rather than the entire surface. The grooves are left as voids without self-adhesive material, creating local differentiation in adhesive properties. This allows the membrane to achieve sufficient adhesion through the ribs while reducing the quantity of expensive self-adhesive material required.
2Reliability
If release film covers the entire surface, then protection during storage is improved, but film removal becomes difficult on hot days
Solution Approach 1:
The release film only needs to cover the ribs rather than the entire surface. The grooves remain exposed without release film, creating local differentiation in film coverage. This reduces the total contact area between the release film and the bituminous membrane, making it easier to peel off the film without the membrane adhering to the film during removal, especially in hot conditions.
3Use of energy by moving object
If grooves are impressed in the bituminous layer, then heating energy is reduced, but material optimization is limited
Solution Approach 1:
The patent divides the bituminous membrane surface into distinct ribs and grooves, where the ribs are separate applied material rather than being part of the continuous bituminous layer. This segmentation allows independent selection of materials for ribs and the underlying layer, enabling optimization for specific purposes such as using self-adhesive material for ribs while using less expensive material for the bulk layer.
Solution Approach 2:
The patent uses composite construction by applying rib material separately from the underlying bituminous layer. This allows the combination of different materials with complementary properties - the self-adhesive rib material provides bonding functionality while the underlying layer provides structural support and can be made from cost-effective materials.
Data Source
Figure 1
AI summary
The method for producing a bitumen membrane with a substrate (11) which is provided on at least one side with a bitumen covering layer provided with a pattern of parallel grooves and intermediate ribs (14), is characterized in that on the substrate (11 ) First, apply a layer (13) of bitumen compound evenly and then apply the ribs (14) directly to the layer (13) with an applicator roller. In this way it is possible that the material of the ribs (14) differs from the underlying material (13) of the bitumen covering layer. For example, it is possible that only the material of the ribs (14) is self-adhesive. This results in the additional advantage that the separating film (15) required for rolling up the web can be pulled off more easily.