Opaque Label Polymer Back-Coating for Wet Opacity
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Solution Overview
Problem
Current uncoated paper labels for bottles, especially those intended for humid environments like refrigerators or ice buckets, fail to maintain intense whiteness and opacity when exposed to water, leading to air bubble formation and unsightly appearance due to insufficient water resistance and wet opacity.
Innovation Solution
Applying a layer of liquid polymer with an opacifying agent or filler, such as titanium, on the back of uncoated base paper to enhance both dry and wet opacity, and incorporating additional polymers like epichlorohydrin to increase breaking strength, while maintaining initial appearance and water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied to attach the label to the bottle, then the label is secured to the support, but water infiltration occurs under the paper causing air bubbles and unsightly appearance
Solution Approach 1:
A polymer layer is introduced as an intermediary between the adhesive and the paper support. This polymer layer acts as a barrier that prevents water from infiltrating under the paper while still allowing the adhesive to bond the label to the bottle, thereby eliminating air bubble formation and unsightly appearance
Solution Approach 2:
The label structure is transformed into a composite material system consisting of multiple layers: the paper support, the polymer layer with specific water resistance properties, and the adhesive layer. This composite structure combines the bonding strength of adhesive with the water barrier properties of the polymer layer
2Illumination intensity
If uncoated paper is used for the label, then the initial appearance and whiteness are maintained, but opacity is insufficient in humid environment and water immersion
Solution Approach 1:
The uncoated paper is combined with a polymer layer that has superior opacity and water resistance properties. This composite structure maintains the initial appearance and whiteness of the uncoated paper while the polymer layer provides the necessary opacity stability during water immersion and humid environment exposure
Solution Approach 2:
The optical and barrier parameters of the label are enhanced by adding the polymer layer. This layer changes the overall transmission and scattering properties of the label, providing increased opacity and water resistance without compromising the visual appearance of the uncoated paper
3Ease of manufacture
If standard paper is used without polymer coating, then manufacturing simplicity is maintained, but wet opacity and water resistance are insufficient during long immersion
Solution Approach 1:
The polymer layer is applied in advance to the paper support during the manufacturing process, creating a pre-treated material that inherently possesses the required water resistance and wet opacity. This preliminary action ensures that when the label is later subjected to water immersion, the protective properties are already in place
Solution Approach 2:
The label is manufactured as a composite material combining paper and polymer layers. This composite structure integrates the manufacturing simplicity of paper with the enhanced performance properties of the polymer, achieving both ease of manufacture and superior wet opacity and water resistance
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 effectively limits water penetration and maintains label appearance and opacity in humid conditions, addressing the shortcomings of existing labels by providing improved wet opacity and resistance to water immersion.
Implementation Method 1
at least one layer of a liquid polymer, in which is incorporated an opacifying agent or filler... so as to produce an opaque layer and limiting the passage of water
Implementation Method 2
an opacifying agent or filler, intended to give said product a dry and wet opacity... Currently, titanium is the most opaque product on the market
Data Source
AI summary
Paper for a label (1), characterized in that it is formed by a paper medium having a non-coated base (2), on the back of which is applied, by any means, at least one coating of a polymer liquid (3), into which is incorporated an opacifying agent or load, which gives said product a dry and wet opacity, which is added to that of the paper medium having a non-coated base (2), so as to produce an opaque coating and limit water passing between the product to be labeled and the paper medium having a non-coated base (2), for use of the product in a wet environment or when it must be submerged in water, while preserving the label qualities.