Eye Drop Inner Plug Composite Resin Sorption
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Solution Overview
Problem
Existing eye drop containers face challenges in suppressing the sorption of active components due to the adsorption properties of materials like polyethylene and polypropylene, while cyclic olefin copolymers are too hard for use as inner plugs.
Innovation Solution
An inner plug composed of a resin composite containing 25 to 85 parts cyclic olefin copolymer and 15 to 75 parts polyethylene resin, with a flange and leg part design, is mounted in the container body, providing a cyclic olefin copolymer layer for non-sorption and a cushioning effect, and may include rubber or elastomers for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If cyclic olefin copolymer is used in the inner plug, then sorption of eye drops is suppressed, but the material becomes too hard and prone to cracking under stress
Solution Approach 1:
The inner plug is constructed as a composite material consisting of cyclic olefin copolymer (suppressing sorption) and polyethylene resin (providing flexibility and crack resistance). This composite structure allows both materials to contribute their advantageous properties simultaneously, resolving the contradiction between non-sorption and crack resistance.
Solution Approach 2:
Different regions of the inner plug have different material compositions optimized for their specific functions. The cyclic olefin copolymer is concentrated in areas requiring non-sorption properties (liquid contact surfaces), while polyethylene resin is distributed in areas requiring flexibility and stress absorption (structural support regions).
2Strength
If polyethylene or polypropylene is used in the inner plug, then the material is flexible and crack-resistant, but active components of eye drops are adsorbed
Solution Approach 1:
The composite structure combines polyethylene/polypropylene (providing flexibility and crack resistance) with cyclic olefin copolymer (providing non-adsorption properties). This allows the inner plug to maintain mechanical integrity while suppressing harmful adsorption of active components.
Solution Approach 2:
The material composition is optimized locally: polyethylene/polypropylene is used in structural regions requiring flexibility, while cyclic olefin copolymer is used in regions contacting the liquid to prevent adsorption of active components.
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 inner plug effectively suppresses the sorption of eye drops, ensuring stable storage by utilizing the non-sorption properties of cyclic olefin copolymers and maintaining structural integrity through the use of polyethylene resin, preventing cracking under stress.
Implementation Method 1
The inner plug is constituted of a resin composite including a cyclic olefin copolymer and a polyethylene resin... sorption (adsorption, absorption) of eye drops can be suppressed
Data Source
AI summary
The inner plug is mounted in an opening part of a container body and constitutes a nozzle part. The inner plug is constituted of a resin composite including a cyclic olefin copolymer and a polyethylene resin. A proportion of the cyclic olefin copolymer in 100 parts by weight of the resin composite is 25 to 85 parts by weight, a proportion of the polyethylene resin therein is 15 to 75 parts by weight, and a total amount of the cyclic olefin copolymer and the polyethylene resin is 80 to 100 parts by weight.