Tyre Cavity Sound-Absorbing Strip Application Without Adhesive Damage
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Solution Overview
Problem
The existing methods for applying sound-absorbing material in pneumatic tyres require manual intervention, are lengthy, and can damage the adhesive layer, leading to potential material cracks due to elongations or compressions during application.
Innovation Solution
A method and application unit that automates the process using a heated instrument to thermally separate the excess material from the protective lining, followed by a synchronized applicator and recovery drum to apply the sound-absorbing material without mechanical friction, ensuring the protective lining remains intact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual separation of protective lining from sound-absorbing material is used, then the adhesive layer can be protected from damage, but the process becomes lengthy and requires operator intervention
Solution Approach 1:
The patent replaces manual mechanical separation with a thermal cutting system. A heated instrument cuts the sound-absorbing material from the protective lining by thermal energy, eliminating the need for manual pulling or mechanical force that could damage the adhesive layer. This substitution of mechanical action with thermal energy resolves the contradiction by achieving reliable separation without manual intervention.
Solution Approach 2:
The patent changes the separation method from mechanical (manual pulling) to thermal (heated cutting). By changing the physical parameter from mechanical force to thermal energy, the system achieves clean separation of the sound-absorbing material from the protective lining without damaging the adhesive layer, while also eliminating manual intervention and improving productivity.
2Productivity
If the protective lining is separated early to expose adhesive, then application can proceed, but foreign objects may adhere to the adhesive layer
Solution Approach 1:
The patent performs preliminary thermal cutting to separate the sound-absorbing material from the protective lining before application. This preliminary action is performed in a controlled environment where the adhesive remains protected until the moment of application, preventing foreign object contamination. The heated instrument cuts the material cleanly without exposing the adhesive to ambient contaminants.
3Productivity
If mechanical force is applied to separate protective lining, then separation is achieved, but the sound-absorbing material may undergo elongations or compressions
Solution Approach 1:
The patent substitutes mechanical separation forces with thermal cutting. The heated instrument penetrates and cuts the sound-absorbing material through thermal energy, avoiding mechanical pulling or compression that could cause elongations or compressions. This substitution maintains the material's dimensional stability while achieving rapid separation.
Solution Approach 2:
The patent changes the separation mechanism from mechanical force application to thermal energy application. This parameter change allows for clean, precise cutting of the sound-absorbing material without exerting mechanical stresses that would cause deformation. The thermal cutting method maintains material integrity while enabling efficient separation.
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 method and unit enhance efficiency, reduce costs, and prevent damage to the adhesive layer, ensuring a high-quality application without material elongations or compressions, thus extending the material's lifespan.
Implementation Method 1
cutting, starting from an opposite side of the protective lining (7), the strip (4) of sound-absorbing material (2) and leaving intact the protective lining (7)... carried out by means of a heated instrument (19)
Data Source
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AI summary
Method and application unit for applying a sound-absorbing material (2) to a cavity of a pneumatic tyre (1) using a strip (4) of sound-absorbing material provided on one side with an adhesive layer (6) covered with a protective lining (7), the method comprising the steps of: cutting the strip (4) of sound-absorbing material and leaving intact the protective lining, separating an excess end (5) from the remaining part of the strip of sound-absorbing material (2), eliminating the excess end (5) such as to confer a required length to the same strip of sound-absorbing material and leaving intact a residual portion (9) of the protective lining, progressively separating the protective lining from the strip of sound-absorbing material, step-by-step, as the strip of sound-absorbing material is applied to the cavity of the tyre, wherein a heated instrument (19) for cutting the strip of sound-absorbing material is used.