Plastic Cap Bridge Portion Fusion Bonding
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Solution Overview
Problem
Conventional plastic caps for drug containers face issues with accidental separation of the cover portion, inconsistent joint strength, and limited shape flexibility, which can compromise the sealed state and increase production costs.
Innovation Solution
A plastic cap design featuring a cap main body and cover portion integrated via bridge portions formed from synthetic plastic in fusion-bonding holes, allowing for stable fusion bonding and easy separation by hand, with a high degree of freedom in shape and reduced mold complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cover portion is kept integral with the cap main body using physical fitting or adhesive bonding, then the structure is simple and easy to manufacture, but the cover portion may accidentally separate and joint strength is inconsistent
Solution Approach 1:
The cap is divided into a cap main body and a cover portion that are integrated via bridge portions. The bridge portions act as segmented connectors that provide reliable joining while maintaining ease of manufacture through a modular structure that combines the benefits of integral and separate construction.
Solution Approach 2:
The bridge portions are formed by injecting molten synthetic plastic into fusion-bonding holes, creating a composite structure that integrates the cap main body and cover portion. This composite approach provides consistent joint strength while maintaining manufacturing simplicity.
2Strength
If ultrasonic welding or adhesive bonding is used to join the cover portion, then the joint strength is improved, but production cost increases and solvent effects on drugs are a concern
Solution Approach 1:
The invention replaces ultrasonic welding and adhesive bonding with a mechanical fusion-bonding system. Molten synthetic plastic is injected into fusion-bonding holes to create bridge portions that mechanically join the cap main body and cover portion, eliminating the need for complex welding equipment and adhesive solvents.
Solution Approach 2:
The joining method changes from surface-level bonding (ultrasonic/adhesive) to volumetric fusion bonding. By injecting molten plastic into holes and allowing it to solidify, the bond strength is enhanced through a three-dimensional fusion process rather than a two-dimensional surface bond.
3Reliability
If integral molding is used to join the cap main body and cover portion, then joint strength is stabilized, but mold complexity increases and production cost rises
Solution Approach 1:
The cap construction is segmented into separately formed components (cap main body and cover portion) that are joined through bridge portions. This segmentation allows each component to be formed with simpler molds while achieving stable joint strength through the fusion-bonding process.
Solution Approach 2:
The bridge portions act as intermediaries between the cap main body and cover portion. These bridge portions are formed by injecting molten plastic into fusion-bonding holes, serving as a mediating structure that provides stable joint strength without requiring complex integral molding.
4Reliability
If the cover portion is firmly fixed to prevent separation, then reliability is improved, but ease of operation for manual separation deteriorates
Solution Approach 1:
The bridge portions provide a dynamic bonding solution that is strong under normal conditions but can be separated when sufficient force is applied. The fusion-bonded joints maintain reliability during storage and transport but allow manual separation during use, achieving both reliability and ease of 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 solution provides a cap that is resistant to accidental separation, maintains consistent joint strength, allows for easy manual separation of the cover portion, and offers flexibility in product shape, while being suitable for drug containers and reducing production costs.
Implementation Method 1
the at least one bridge portion is formed of a synthetic plastic filled in at least one fusion-bonding hole having a diameter of from 0.3 to 3 mm and arranged extending through at least one, preferably one of the cap main body and cover portion such that the cap main body and cover portion are integrally fusion-bonded by the at least one bridge portion
Data Source
AI summary
Disclosed is a plastic cap useful for steadfastly maintaining a sealed state created in a container having a mouth with an opening by sealing the opening with a sealing member. The cap has a cap main body and a cover portion integrated with the main body via at least one bridge portion. The main body has a base portion and a top wall. The bridge portion is formed of a synthetic plastic filled in at least one fusion-bonding hole having a diameter of from 0.3 to 3 mm and arranged extending through at least one, preferably one of the main body or cover portion such that the main body and cover portion are integrally fusion-bonded by the bridge portion and the cover portion can be separated from the main body by breaking the bridge portion with hands. A production method of the plastic cap is also disclosed.