3D Printed Tire Retreading with Thermoplastic Elastomer
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Solution Overview
Problem
Conventional retreading processes compromise the integrity and handling of retreaded tires due to the removal of tread patterns and potential exposure of underlying steel belts, leading to safety concerns, especially at high speeds, and result in significant waste as tires are often abandoned rather than recycled.
Innovation Solution
A 3D printing apparatus using thermoplastic elastomer layers, heated to adhere directly onto the worn tire surface without buffing, reinstating the tread pattern through additive manufacturing technologies like fused filament fabrication, with automated control and surface preparation to ensure adhesion and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional retreading process removes worn tread and reglues new treads, then tire tread can be restored, but tire integrity and handling are substantially reduced
Solution Approach 1:
The patent changes the fundamental parameter of tread application from removal-and-reattachment to in-situ additive manufacturing. The 3D printer deposits thermoplastic elastomer material directly onto the worn tread surface, transforming the tread restoration process into a layer-by-layer material deposition process that maintains continuous material integrity and eliminates separation interfaces.
Solution Approach 2:
The patent replaces the mechanical buffing and regluing system with an additive manufacturing system. Instead of mechanically removing material and applying adhesive, the system uses a 3D printer to deposit molten thermoplastic elastomer that bonds to the substrate through controlled cooling and adhesion, eliminating the need for mechanical removal and chemical adhesives.
2Ease of manufacture
If conventional retreading process buffs worn tread, then new tread can be applied, but underlying steel belts are exposed leading to safety concerns
Solution Approach 1:
The patent performs preliminary heating of the worn tread surface before material deposition. The heating element softens the existing thermoplastic elastomer tread, creating a receptive surface that enhances adhesion of the newly deposited material and eliminates the need for aggressive buffing that would expose steel belts.
Solution Approach 2:
The patent changes the physical state of the existing tread material through heating, transforming it from a rigid, non-adhesive state to a softened, adhesive state. This parameter change enables direct bonding of new material to the existing tread without mechanical removal, preventing steel belt exposure.
3Ease of manufacture
If conventional retreading process removes worn tread completely, then new tread can be glued, but significant material waste is generated
Solution Approach 1:
The patent recovers the existing worn tread material by heating it to a softened state and using it as the bonding substrate for new material deposition. Instead of discarding the worn tread as waste, the system recovers its adhesive properties through thermal treatment and integrates it into the restored tread structure.
Solution Approach 2:
The existing worn tread material serves its own purpose as the bonding surface for new material. By heating the worn tread, it becomes self-adhesive, eliminating the need for separate adhesive materials and reducing overall material waste while maintaining structural integrity.
4Reliability
If 3D printing deposits thermoplastic elastomer layers, then tread pattern is reinstated without buffing, but precise temperature control is required for adhesion
Solution Approach 1:
The patent introduces a heating element as an intermediary between the 3D printer and the worn tread surface. This heating intermediary controls the temperature of the substrate to optimize adhesion of the deposited thermoplastic elastomer, managing the thermal parameters required for reliable bonding without requiring complex integration of temperature control into the printer itself.
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
Preserves tire integrity, reduces costs by eliminating buffing steps, allows for multiple retreads without compromising safety, and promotes environmental sustainability by extending tire life and reducing landfill waste, while improving fuel efficiency through reduced rolling resistance.
Implementation Method 1
a heater adapted to heat up the worn surface to a desired temperature
Implementation Method 2
the or each layer of thermoplastic elastomer is capable of adhering to the heated worn surface or a previously laid layer without requiring an adhesive medium or agent
Data Source
AI summary
The present invention relates to an apparatus (10) and a method for retreading a tire (16) having a worn surface (12). The worn surface (12) is made of a thermoplastic elastomer. The apparatus (10) includes a heater (34) and a 3D printer (18). The heater (34) is adapted to heat up the worn surface (12) to a desired temperature. The 3D printer (18) is adapted to lay one or more layers of the thermoplastic elastomer onto the heated worn surface (12). The or each layer of thermoplastic elastomer is capable of adhering to the heated worn surface (12) or previously laid layer without requiring an adhesive medium or agent.