Resin Molded Article Using Recovered Diaper Pulp Composites

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Solution Overview

Problem

Existing methods for reusing materials from used paper diapers are inefficient and require further improvement for effective material reuse.

Innovation Solution

A resin molded article is produced using components derived from used paper diapers, comprising a pulp component, water absorbent material, calcium compound, and optionally a coloring material, with specific content ratios, and can be in the form of inflation films or injection molded articles with a decorative layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of substance

If separate reuse of pulp component and other components is implemented, then material recovery is achieved, but material reuse efficiency is insufficient

Engineering Contradiction:
Improvematerial recoveryVSAvoidmaterial reuse efficiency
Core Design Contradiction:
Loss of substanceVSProductivity

Solution Approach 1:

The patent merges multiple separated components (pulp, water absorbent material, calcium compound, coloring material) into a single integrated resin molded article. This combines previously separately recovered materials into a unified product, achieving both material recovery and improved reuse efficiency by creating a composite material with multiple functions in one article.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The invention creates a composite material by combining pulp component, water absorbent material, calcium compound, and coloring material into a single resin molded article. This composite structure allows multiple materials to work together synergistically, improving overall material reuse efficiency while maintaining the functional benefits of each component.

Inventive Principle:
Principle #40Composite materials

2Object-affected harmful factors

If used paper diaper materials are reused, then environmental burden is reduced, but material quality and effectiveness may be compromised

Engineering Contradiction:
Improveenvironmental burdenVSAvoidmaterial quality
Core Design Contradiction:
Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent applies parameter changes by controlling the content ratios of each component (pulp: 0.1-70 parts, water absorbent material: 0.1-30 parts, calcium compound: 0.1-10 parts, coloring material: 0.1-70 parts relative to resin). By optimizing these parameters, the invention transforms low-quality recovered materials into a high-quality composite resin molded article that meets performance requirements while reducing environmental burden.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The composite material structure allows the combination of recovered materials with resin and various additives to create a new material with improved properties. The synergistic effect of combined components compensates for the limitations of individual recovered materials, ensuring both environmental benefit and material reliability.

Inventive Principle:
Principle #40Composite materials

Data Source

PatentUS20260022218A1Resin molded article
Publication Date: 2026.01.22 TOPPAN HOLDINGS INC
  • US20260022218A1 patent drawing

AI summary

The resin molded article comprises a resin derived from a used paper diaper. The resin molded article comprises a pulp component, and the content of the pulp component may be 0.1 parts by mass or more relative to the mass of the resin, which is taken as 100 parts by mass.