Bossed Separating Membrane With Internal Crown For Adhesion
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Solution Overview
Problem
Conventional separating membranes with bossed sheets suffer from weak adhesion to both the cement adhesive and the base layer, leading to issues like localized detachments and delamination, which are not adequately addressed by existing solutions, particularly in terms of meeting the required adhesion standards and manufacturing complexity.
Innovation Solution
A separating membrane with cylindrical bosses featuring an internal crown that divides the chamber into two compartments, enhancing adhesion on the upper face for tear strength and increasing the contact area with the base layer for improved delamination resistance, combined with a production process that includes specific notch configurations on the forming roller to achieve these features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional bossed sheets are used with simple cylindrical bosses, then the manufacturing process is simple, but the adhesion to cement adhesive and base layer is weak
Solution Approach 1:
The boss chamber is divided into two compartments by an internal crown structure, creating an upper compartment for adhesive penetration and a lower compartment for base layer contact. This segmentation allows the boss to simultaneously achieve strong adhesion to both the cement adhesive and the base layer, resolving the weakness in conventional simple cylindrical bosses.
Solution Approach 2:
The internal crown creates different local zones within the boss: the upper compartment with larger diameter for adhesive penetration and gripping, and the lower compartment with smaller diameter for base layer contact. This local differentiation optimizes adhesion properties in different regions of the same boss structure.
2Reliability
If the boss chamber is divided into two compartments with internal crown, then the adhesion and delamination resistance are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The internal crown structure is pre-formed during the extrusion process itself, rather than requiring subsequent machining or assembly steps. The extrusion die is designed to directly create the two-compartment boss structure, which preliminary establishes the geometric precision needed for reliable adhesion while avoiding complex post-processing operations.
3Reliability
If larger contact area with base layer is achieved, then the delamination resistance increases, but the adhesive penetration capability may be reduced
Solution Approach 1:
The internal crown introduces a vertical dimension differentiation within the boss structure, creating distinct upper and lower compartments at different heights. This vertical dimensionality allows the upper compartment to facilitate adhesive penetration from above while the lower compartment provides extended contact area with the base layer, simultaneously achieving both adhesion goals without conflict.
Data Source
AI summary
Separating membrane of plastic material, made up of a bossed and waterproof sheet which is coupled with a permeable base layer. The bosses are of the cylindrical type with a double diameter and have such a shape and arrangement as to feature improved adhesion on both faces. The gripping of the adhesive is increased in order to obtain greater tear strength, on the upper face, and at the same time increases the area of contact with the base layer for a greater resistance to delamination on the lower face. In particular, inside each chamber there is an internal crown, which divides it like a necking into two superimposed compartments having the same diameter, wherein the first compartment has a depth amounting to at least ⅓ of the total. A production process for obtaining the membrane is also disclosed.