Colored Sheet with Restriction Layer for Ink Bleeding Prevention

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Solution Overview

Problem

Conventional colored sheets used to adhere to human skin for hiding freckles or wrinkles face issues with color bleeding and unnatural appearance due to ink penetration through the thin film, especially when using techniques like inkjet for custom sizing and color matching.

Innovation Solution

A method and structure for manufacturing a colored sheet involving a thin film with a restriction layer containing spherical microparticles and a colored layer with acicular microparticles, where the restriction layer prevents ink penetration, allowing for arbitrary color and pattern application without bleeding, and the sheet is designed to be thin and flexible for a natural appearance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If inkjet technique is used for custom sizing and color matching, then adaptability and manufacturing precision are improved, but color bleeding occurs due to ink penetration through the thin film

Engineering Contradiction:

Improvecustom sizing and color matchingVSAvoidcolor bleeding

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

A restriction layer comprising spherical microparticles is introduced as an intermediary between the thin film and the colored layer. This restriction layer acts as a barrier that prevents ink penetration and color bleeding while allowing the inkjet technique to achieve custom sizing and color matching on the colored layer surface.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The colored sheet is constructed as a composite structure with multiple layers: a thin film base material, a restriction layer with spherical microparticles, and a colored layer with acicular microparticles. This composite structure combines the benefits of thin flexibility with ink penetration resistance and colorfastness.

Inventive Principle:

Principle #40Composite materials

2Ease of operation

If the sheet is made thin and flexible for natural appearance, then ease of operation and aesthetic quality are improved, but ink penetration through the film increases causing color bleeding

Engineering Contradiction:

Improvenatural appearance when adheredVSAvoidink penetration

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The restriction layer serves as a mediator that decouples the relationship between thin film flexibility and ink penetration resistance. It allows the thin film to maintain its thin and flexible characteristics for natural appearance while the restriction layer blocks ink penetration.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The sheet is segmented into distinct functional layers: the thin film provides flexibility and conformability, while the separate restriction layer provides ink barrier functionality. This segmentation allows each layer to optimize its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

3Ease of manufacture

If conventional colored sheets are used to hide freckles or wrinkles, then cosmetic effect is achieved, but unnatural appearance results due to color bleeding

Engineering Contradiction:

Improvecosmetic effectVSAvoidunnatural appearance

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The restriction layer acts as a protective intermediary that prevents color bleeding, thereby maintaining the natural appearance of the cosmetic effect. It allows the colored layer to provide the desired cosmetic coverage without the harmful side effect of ink penetration through the film.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 prevents color bleeding and ensures a natural appearance by using a thin, flexible sheet with a restriction layer that bars ink penetration, allowing for precise color application and hiding of imperfections like freckles and wrinkles.

Implementation Method 1

a restriction layer that is disposed on the thin film and contains spherical microparticles

Methodology Applied

Scientific EffectPhysical barrier (restriction layer): Filter (physical)

Implementation Method 2

a colored layer that is disposed on the restriction layer and contains a larger number of acicular microp articles than a number of acicular microparticles contained in the restriction layer

Methodology Applied

Scientific EffectLight interaction with microparticles: Scattering

Data Source

PatentUS11571369B2Method for manufacturing colored sheet and colored sheet

Publication Date: 2023.02.07 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A method for manufacturing a colored sheet for coloring an object by adhesion to the object includes, a coloring step of applying by spraying, a first coating fluid containing first microp articles for coloring to a thin film of a print receiver body which has a sheet-shaped support body and the thin film, the thin film being peelably held on the sheet-shaped support body to serve as a base material of an adhesive sheet which is to be adhered to the object, and a restricting step of applying by spraying, before the coloring step, a second coating fluid for restricting the first microparticles from penetrating the thin film to a location where the first coating fluid is to be applied.