Pigmented Laminated Adhesive Tape for UV Blocking and Clean Hand-Cutting

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Solution Overview

Problem

Conventional adhesive tapes for house wrap sheets have inadequate UV blocking properties, leading to decreased adhesive force, curling, and mechanical strength degradation due to sunlight exposure, and poor hand-cutting properties.

Innovation Solution

An adhesive tape comprising a base material layer of flat yarn cloth with thermoplastic resin films laminated on both surfaces, containing a black pigment in both film layers, and an adhesive layer formed with an acrylic polymer and crosslinking agent, enhancing UV blocking and mechanical properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a paper or cloth adhesive tape is used, then the tape is easily obtainable and inexpensive, but the hand-cutting property is poor and it is difficult to cut linearly and neatly

Engineering Contradiction:

Improveease of obtaining adhesive tapeVSAvoidhand-cutting property

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The base material is changed from conventional paper or cloth to a thermoplastic resin film, which fundamentally alters the material properties to enable linear cutting while maintaining ease of application. The thermoplastic resin allows for clean cuts without fraying or deformation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The adhesive tape uses a composite structure combining thermoplastic resin film as the base material with adhesive layers on both surfaces. This composite design provides both the cutability of the resin film and the bonding capability of the adhesive layers.

Inventive Principle:

Principle #40Composite materials

2Ease of operation

If a thermoplastic resin film adhesive tape is used to improve hand-cutting property, then the tape can be cut linearly and neatly, but the UV blocking property is insufficient leading to adhesive force decrease and curling

Engineering Contradiction:

Improvehand-cutting propertyVSAvoidUV blocking property

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The thermoplastic resin film is colored black, which fundamentally changes the optical properties to provide strong UV absorption. The black color absorbs ultraviolet radiation, preventing it from reaching and degrading the adhesive layers, thereby preventing curling and maintaining adhesive force.

Inventive Principle:

Principle #32Color changes

Solution Approach 2:

The material composition is changed by incorporating UV absorbers or pigments into the thermoplastic resin film, altering its optical parameters to provide sufficient UV blocking capability while maintaining the cutability benefits of the thermoplastic material.

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If pigment is added to thermoplastic resin film to improve UV blocking, then UV protection is enhanced, but the temperature is elevated causing curling and tensile strength decrease

Engineering Contradiction:

ImproveUV blocking propertyVSAvoidtemperature elevation

Core Design Contradiction:

Object-affected harmful factorsVSTemperature

Solution Approach 1:

The pigment concentration in the thermoplastic resin film is precisely controlled to achieve sufficient UV blocking while minimizing heat absorption. By optimizing the pigment content parameter, the balance between UV protection and temperature control is achieved.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The film structure is designed with specific thickness and pigment distribution to provide localized UV blocking where needed while maintaining overall thermal stability. The thin film structure with controlled pigment placement blocks UV effectively without concentrating excessive heat.

Inventive Principle:

Principle #3Local quality

4Strength

If the adhesive tape is made with thick film layer to improve mechanical strength, then the tape becomes more durable, but the hand-cutting property deteriorates and the tape becomes difficult to cut linearly

Engineering Contradiction:

Improvemechanical strengthVSAvoidhand-cutting property

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The film thickness is optimized to a specific range that maintains sufficient mechanical strength while allowing for easy linear cutting. The thermoplastic resin material properties are adjusted to enable clean cuts even at the optimized thickness, resolving the contradiction between strength and cutability.

Inventive Principle:

Principle #35Parameter changes

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 adhesive tape maintains excellent hand-cutting and mechanical properties, resisting curling and maintaining adhesive force even under sunlight exposure, making it suitable for fixing house wrap sheets.

Implementation Method 1

a black pigment is contained in both the first film layer and the second film layer... excellent in the UV blocking property

Methodology Applied

Scientific EffectUV absorption: Absorption (EM radiation)

Data Source

PatentEP3862401B1Adhesive tape

Publication Date: 2025.12.10 MITSUBISHI CHEM CORP

AI summary

The present invention relates to an adhesive tape comprising a base material layer made of a flat yarn cloth, a first film layer made of a thermoplastic resin film layered on one surface of the base material layer, a second film layer made of a thermoplastic resin film layered on the other surface of the base material layer, and an adhesive layer layered on the surface of the second film layer opposite to the base material layer, in which the first film layer and the second film layer both contains a pigment.