Hydrolyzable sheet

Solution Overview

Problem

Conventional toilet cleaning sheets face challenges in maintaining both surface strength and water dispersing properties, often resulting in tears during scrubbing and hand roughness due to chemical solutions.

Innovation Solution

A water-dispersible sheet with a base paper sheet impregnated by a chemical solution containing diethylene glycol monobutyl ether and propylene glycol monomethyl ether, along with a cross-linking agent, which enhances surface strength while maintaining water dispersing properties and reducing hand roughness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the sheet strength is prioritized, then the surface strength is improved, but the water dispersing property deteriorates

Engineering Contradiction:

Improvesurface strengthVSAvoidwater dispersing property

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent applies parameter changes by carefully controlling the concentration ratios of specific glycol ethers (propylene glycol monomethyl ether and diethylene glycol monobutyl ether) in the chemical solution impregnated on the sheet. By optimizing these chemical parameters within specific ranges, the invention achieves both improved surface strength and maintained water dispersing properties, resolving the contradiction between strength and dispersibility.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite materials by combining multiple glycol ethers with specific properties in the chemical solution. The synergistic effect of propylene glycol monomethyl ether and diethylene glycol monobutyl ether creates a composite chemical system that simultaneously provides surface strength enhancement and water dispersing capability, addressing both requirements.

Inventive Principle:

Principle #40Composite materials

2Reliability

If the water dispersing property is prioritized, then the sheet disperses easily in water, but the surface strength deteriorates and the sheet is torn easily during scrubbing

Engineering Contradiction:

Improvewater dispersing propertyVSAvoidsurface strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent applies parameter changes by carefully controlling the concentration ratios of specific glycol ethers (propylene glycol monomethyl ether and diethylene glycol monobutyl ether) in the chemical solution impregnated on the sheet. By optimizing these chemical parameters within specific ranges, the invention achieves both improved surface strength and maintained water dispersing properties, resolving the contradiction between strength and dispersibility.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite materials by combining multiple glycol ethers with specific properties in the chemical solution. The synergistic effect of propylene glycol monomethyl ether and diethylene glycol monobutyl ether creates a composite chemical system that simultaneously provides surface strength enhancement and water dispersing capability, addressing both requirements.

Inventive Principle:

Principle #40Composite materials

3Ease of operation

If conventional chemical solutions are used, then the cleaning function is provided, but hand roughness occurs

Engineering Contradiction:

Improvecleaning functionVSAvoidhand roughness

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by selecting and optimizing the types and concentrations of glycol ethers in the chemical solution. By changing the chemical composition parameters to include specific ratios of propylene glycol monomethyl ether and diethylene glycol monobutyl ether, the invention maintains cleaning effectiveness while reducing hand roughness through the milder properties of these specific compounds.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses intermediary substances (specific glycol ethers) that act as mediators between the cleaning function and skin compatibility. These glycol ethers serve as intermediate compounds that provide the necessary cleaning performance while being gentler on the skin, thus reducing hand roughness.

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 provides improved surface strength and maintained water dispersing properties, reducing the likelihood of tears during scrubbing and minimizing hand roughness, as demonstrated by the addition of specific glycol ether concentrations in the chemical solution.

Implementation Method 1

the chemical solution further comprises a cross-linking agent that forms cross-links with the water-soluble binder

Methodology Applied

Scientific EffectCross-linking: Chemical Bonding

Implementation Method 2

the base paper sheet is impregnated with the chemical solution of 100 to 500 % by mass relative to the mass of the base paper sheet

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Data Source

PatentEP4015706B1Hydrolyzable sheet

Publication Date: 2023.12.20 DAIO PAPER CORP

Figure 1
Figure 2A~2B
Figure 3A~3C

AI summary

According to the present invention, in a toilet cleaner S obtained by impregnating a base sheet comprising an aggregation of water dispersible fibers with a chemical liquid, glycol ethers, particularly 11.50-13.50 mass% of a propylene glycol monomethyl ether and 3.00-5.00 mass% of a diethylene glycol monobutyl ether, are added to the chemical liquid, whereby the toilet cleaner S can be produced which inhibits the symptom of dishpan hands, and has significantly improved surface strength and cleaning performance with the water dispersing property thereof maintained.