Tire Reinforcing Cord Adhesion via Polyamide Layer
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Solution Overview
Problem
Existing tire technologies face challenges in maintaining adhesion durability between the tire frame and reinforcing metal cords, especially under heat treatment conditions, as current adhesion layers are not effective at high temperatures.
Innovation Solution
A tire design featuring a reinforcing metal cord member coated with a polyamide-based thermoplastic resin or elastomer, using an adhesion layer with a melting point of 160° C to 200° C, applied via extrusion at a temperature matching or exceeding the adhesion layer's melting point, ensuring strong adhesion and durability even after heat treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional adhesion layer is used to coat the reinforcing metal cord member, then the adhesion is sufficient at room temperature, but the adhesion durability deteriorates under heat treatment conditions (140°C or higher)
Solution Approach 1:
The patent changes the melting point parameter of the adhesion layer from conventional values (below 140°C) to a specific range of 140°C to 200°C. This parameter change ensures that the adhesion layer maintains its adhesive properties during heat treatment at 140°C or higher, while still being applicable through extrusion at moderate temperatures. The adhesion layer comprises a polyamide-based resin with this specific melting point range, which prevents adhesion deterioration under heat treatment conditions.
Solution Approach 2:
The patent creates a composite structure consisting of three layers: the reinforcing metal cord member, the adhesion layer with specific melting point (140-200°C), and the coating composition layer. This composite material approach combines the metal cord's strength with the polyamide-based adhesion layer's heat-resistant adhesive properties and the coating composition's protective function, achieving both strong adhesion and heat treatment durability.
2Reliability
If the melting point of the adhesion layer is increased to improve heat resistance, then the adhesion durability under heat treatment improves, but the ease of manufacture deteriorates due to higher extrusion temperature requirements
Solution Approach 1:
The patent optimizes the melting point parameter of the adhesion layer to fall within 140°C to 200°C, which is high enough to ensure adhesion durability during heat treatment at 140°C or higher, but low enough to allow extrusion at moderate temperatures. This balanced parameter selection resolves the contradiction between heat resistance and manufacturing ease, as the adhesion layer can be extruded without requiring excessive heat while maintaining its adhesive strength under subsequent heat treatment conditions.
3Ease of manufacture
If a thermoplastic polymer material is used for the coating composition, then the ease of manufacture and cost are improved, but the adhesion durability under heat treatment deteriorates
Solution Approach 1:
The patent introduces an adhesion layer as an intermediary between the reinforcing metal cord member and the thermoplastic coating composition. This adhesion layer, comprising a polyamide-based resin with melting point of 140-200°C, acts as a mediator that provides heat-resistant adhesion. The thermoplastic coating composition can be applied over this adhesion layer, maintaining the ease of manufacture and cost advantages of thermoplastics while the adhesion layer ensures adhesion durability during heat treatment.
Solution Approach 2:
The patent creates a composite structure where a thermoplastic coating composition is applied over a polyamide-based adhesion layer with specific melting point (140-200°C). This composite approach allows the thermoplastic material to provide ease of molding and cost benefits, while the polyamide adhesion layer underneath ensures adhesion durability during heat treatment, thus resolving the contradiction between manufacturing ease and adhesion 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 solution provides enhanced adhesion durability and resistance to heat treatments, improving the tire's puncture resistance, cut resistance, and circumferential rigidity, while simplifying the production process and reducing material costs by eliminating the need for vulcanization.
Implementation Method 1
an adhesion layer having a melting point of from 160° C. to 200° C. and comprising a polyamide-based adhesive
Implementation Method 2
the coating of the at least a portion of the reinforcing metal cord member with the coating composition is performed by extruding the coating composition from an extruder
Implementation Method 3
a polyamide-based thermoplastic resin having a melting point of from 160° C. to 240° C. or a polyamide-based thermoplastic elastomer having a melting point of from 160° C. to 240° C.
Data Source
AI summary
Provided are: a tire including: a tire frame; and a reinforcing metal cord member that is wound at least on the outer circumference of the tire frame, wherein at least a portion of the reinforcing metal cord member is coated with a coating composition via an adhesion layer that contains a polyamide-based adhesive and has a melting point of from 160° C. to 200° C., the coating composition containing at least one thermoplastic material selected from polyamide-based thermoplastic resins having a melting point of from 160° C. to 240° C. and polyamide-based thermoplastic elastomers having a melting point of from 160° C. to 240° C.; and a method of producing the same.