Strip Rubber Adhering Apparatus with Localized Cooling
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Solution Overview
Problem
In tire component molding, strip rubber adhered to a drum at high temperature shrinks upon cooling, leading to gaps and air entrapment, while complete cooling reduces adhesiveness, causing further gaps and air retention.
Innovation Solution
A strip rubber adhering method involving extrusion of rubber with an apex portion, using a rotatable pressure bonding roller to adhere and cool the rubber surface near the apex portion as it winds spirally around the drum, minimizing air retention and ensuring tight adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strip rubber is adhered to the drum at high temperature, then adhesiveness is improved, but thermal shrinkage upon cooling creates gaps and air entrapment
Solution Approach 1:
The strip rubber is pre-cooled by blowing air onto its surface before adhesion occurs. This preliminary cooling action reduces the temperature of the rubber surface that will contact the drum, minimizing subsequent thermal shrinkage and gap formation while maintaining adequate adhesiveness through the timing and localization of the cooling action.
Solution Approach 2:
Cooling air is directed specifically onto the surface of the strip rubber that will be adhered to the drum, rather than cooling the entire rubber structure uniformly. This localized cooling approach maintains the temperature gradient needed for adhesion while preventing shrinkage gaps in the critical adhesion zone.
2Manufacturing precision
If strip rubber is completely cooled before adhesion, then thermal shrinkage is prevented, but adhesiveness is reduced causing gaps and air retention
Solution Approach 1:
The cooling action is applied preliminarily and locally to the adhesion surface of the strip rubber, preparing it for optimal adhesion by reducing thermal shrinkage risk while maintaining the temperature and adhesiveness needed for successful bonding to the drum.
Solution Approach 2:
Only the specific surface area of the strip rubber that contacts the drum is cooled, while the rest of the rubber structure remains at higher temperature to maintain overall adhesiveness. This selective cooling prevents the complete cooling problem while achieving gap prevention.
3Reliability
If strip rubber is cooled locally before adhesion, then adhesiveness is maintained, but cooling uniformity may be compromised
Solution Approach 1:
The cooling system is designed to apply cooling air to specific critical zones of the strip rubber surface with controlled distribution. This localized quality approach accepts non-uniform cooling as a necessary condition to maintain adhesiveness, focusing cooling effectiveness where it matters most for preventing adhesion gaps.
Solution Approach 2:
Rather than attempting uniform cooling across the entire strip rubber surface, the system applies partial cooling action to the critical adhesion zones. This partial action is sufficient to prevent thermal shrinkage gaps while maintaining overall adhesiveness, avoiding the problems of excessive or uniform cooling.
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
Prevents air from remaining in the tire component, maintains uniform thickness, and prevents deformation and size issues by cooling only the surface before adhesion, ensuring high adhesiveness and preventing pressure bonding roller deterioration.
Implementation Method 1
exposing the surface of the strip rubber on the apex portion side to wind supplied from a blowing apparatus in the vicinity of a position of adhesion of the strip rubber to the drum and cooling the surface of the strip rubber on the apex portion side
Data Source
AI summary
A strip rubber adhering apparatus includes a rotating drum; an extruder configured to extrude strip rubber of a shape having an apex portion in cross section toward the drum; a pressure bonding roller configured to press a surface of the strip rubber on the apex portion side in the direction of the drum, and adhere the surface of the strip rubber on a side opposite to the apex portion side to the drum; and a blowing apparatus configured to supply wind toward the surface of the strip rubber on the apex portion side in the vicinity of a position of adhesion of the strip rubber with respect to the drum, wherein the drum and the extruder are relatively movable in the direction of axis of the drum with respect to each other.