Cap Polyester Resin Coating Lubricant Retention
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Solution Overview
Problem
Conventional caps with epoxy phenol resin inner surface coatings do not effectively reduce opening torque when a lubricant is added, as the friction reducing effect of the lubricant is not exhibited, leading to insufficient improvement in opening performance.
Innovation Solution
A cap design featuring a polyester-based resin coating with a hydrocarbon-based wax or a combination of hydrocarbon-based and fatty acid ester-based waxes as lubricants, applied to the inner surface of the cap body, along with a separately provided sealing member, to reduce friction and improve opening torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a lubricant is added to an epoxy phenol resin inner surface coating material, then the coating material provides corrosion resistance and adhesion, but the friction reducing effect of the lubricant is not exhibited and opening torque cannot be sufficiently reduced
Solution Approach 1:
The patent changes the resin type parameter from epoxy phenol resin to polyester-based resin, which fundamentally alters the coating material's properties. This parameter change enables the lubricant to effectively reduce friction and opening torque while maintaining corrosion resistance and adhesion, resolving the contradiction between ease of operation and reliability
Solution Approach 2:
The patent creates a composite coating material by combining polyester-based resin with specific lubricants (hydrocarbon-based wax or fatty acid ester-based wax). This composite structure allows the lubricant to be effectively retained and released during cap opening, achieving both low opening torque and reliable friction reduction
2Ease of operation
If a lubricant is added to the resin coating film, then opening torque is reduced, but the lubricant particles may fall off during cap shaping
Solution Approach 1:
The patent changes the resin type to polyester-based resin, which has different physical and chemical properties compared to epoxy phenol resin. This parameter change improves the resin's ability to retain lubricant particles during shaping while still allowing them to be released during cap opening, thus reducing opening torque
Solution Approach 2:
The polyester-based resin acts as an intermediary medium that holds the lubricant particles (hydrocarbon-based wax or fatty acid ester-based wax) in place during cap shaping. The resin matrix prevents particle detachment while maintaining the lubricant's functionality during the opening operation
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 use of polyester-based resin with hydrocarbon-based wax or its combination with fatty acid ester-based wax significantly reduces the opening torque and enhances the opening performance of the cap, while the sealing member's design ensures stable retention of the lubricant particles, preventing them from falling off during cap shaping.
Implementation Method 1
the resin coating film including a polyester-based resin and a lubricant
Data Source
AI summary
A cap comprising a cap body including a top plate portion which is disk-shaped, and a skirt portion which is cylindrical and provided at a peripheral edge portion of the top plate portion, the top plate portion including a substrate and a resin coating film provided on a cap inner surface side of the substrate, the resin coating film including a polyester-based resin and a lubricant, and a sealing member provided in the cap body separately from the cap body so as to face the top plate portion, and having an outer diameter smaller than an inner diameter of the skirt portion.