Multilayer Light-Shielding Sheet with Eluate-Blocking Barrier
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Solution Overview
Problem
Current packaging solutions for pharmaceutical products and medical supplies fail to effectively shield specific wavelengths of light while allowing visual inspection and preventing contamination from light-shielding substances, leading to potential deterioration of contents.
Innovation Solution
A multilayer sheet with a light-shielding layer containing ultraviolet absorbers and pigments, combined with an eluate-blocking layer, using cyclic polyolefin-based, fluorine-based, or polyester-based resins, which prevents the elution of light-shielding substances into the contents and allows for adequate visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-shielding film is used to protect contents from light, then light-shielding function is improved, but visual inspection capability deteriorates
Solution Approach 1:
The packaging is divided into multiple functional layers: a light-shielding layer (with ultraviolet absorber and pigment) and a transparent window portion. This segmentation allows different parts of the packaging to perform different functions - the light-shielding layer blocks harmful light while the transparent window enables visual inspection of contents without compromising either function.
2Object-affected harmful factors
If ultraviolet absorber and pigment are added to packaging material, then light-shielding function is improved, but contamination risk increases
Solution Approach 1:
A barrier layer is introduced as an intermediary between the light-shielding layer (containing ultraviolet absorber and pigment) and the contents. This barrier layer prevents the elution and bleeding of light-shielding substances into the contents while allowing the light-shielding layer to maintain its light-blocking function. The barrier layer acts as a mediator that isolates the harmful substances from direct contact with the contents.
3Object-affected harmful factors
If total light transmittance at 500 nm is reduced to 5% or lower for light shielding, then light-shielding function is improved, but visibility of contents deteriorates
Solution Approach 1:
Different regions of the packaging have different optical properties: the light-shielding layer has low light transmittance (5% or lower at 500 nm) to block harmful light, while the transparent window portion has high light transmittance to enable visibility of contents. This local differentiation of optical quality allows the packaging to simultaneously achieve light shielding and visual inspection capabilities.
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 effective light shielding without contamination, ensuring the stability and visibility of contents, even under high temperatures and sterilization conditions, while maintaining the safety and practicality of the packaging.
Implementation Method 1
a light-shielding layer which is made of a resin containing at least one of an ultraviolet absorber, an organic pigment, an inorganic pigment, an inorganic substance, a colored pigment, a fluorescent brightening agent, and a dye
Implementation Method 2
a light-shielding layer which is made of a resin containing at least one of an ultraviolet absorber, an organic pigment, an inorganic pigment, an inorganic substance, a colored pigment, a fluorescent brightening agent, and a dye
Data Source
AI summary
Provided are a light-shielding sheet that has a function of shielding light of a specific wavelength and that is capable of preventing a light-shielding substance from being transferred into the contents and seeping out of a container and a container produced using the light-shielding sheet. This light-shielding sheet of the present invention has a multilayer structure of three or more layers including at least one light-shielding layer that shields a specific wavelength and/or eluate-blocking layer that blocks substances eluted from the light-shielding layer. When producing a container from the light-shielding sheet, an eluate-blocking layer A is provided at least between the light-shielding layer and an innermost layer or on the innermost layer, and an eluate-blocking layer B is provided between the light-shielding layer and an outermost layer or on the outermost layer. The light-shielding layer may further double as an eluate-blocking layer.