Mixed Pulp Composites for Food Packaging

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Solution Overview

Problem

Current plastic packaging materials, particularly single-use plastics, pose significant environmental challenges due to slow degradation rates and high production emissions, and existing biodegradable alternatives like molded pulp face limitations in mechanical strength and safety for food applications.

Innovation Solution

Development of mixed pulp compositions comprising a blend of short and long fiber plant pulps, primarily using sugarcane bagasse and bamboo fibers, which are processed to create a biodegradable, compostable, and hygienic material with enhanced mechanical strength and resistance to water and oil.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of stationary object

If conventional molded pulp is used for food packaging, then biodegradability is improved, but mechanical strength and wet strength deteriorate

Engineering Contradiction:

ImprovebiodegradabilityVSAvoidmechanical strength

Core Design Contradiction:

Duration of action of stationary objectVSStrength

Solution Approach 1:

The patent uses a composite material system consisting of natural fiber pulp (cellulose-rich) combined with biopolymer coating (starch-based or protein-based). This composite structure allows the pulp to provide biodegradability while the biopolymer coating reinforces mechanical strength and provides water/oil resistance, resolving the contradiction between biodegradability and mechanical strength

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the surface properties of molded pulp by applying biopolymer coatings that change the material parameters. The coating process alters surface hydrophobicity, mechanical strength, and barrier properties, enabling the material to maintain structural integrity and resist water/oil while remaining biodegradable

Inventive Principle:

Principle #35Parameter changes

2Duration of action of stationary object

If conventional molded pulp is used for food packaging, then biodegradability is improved, but resistance to water and oil deteriorates

Engineering Contradiction:

ImprovebiodegradabilityVSAvoidwater and oil resistance

Core Design Contradiction:

Duration of action of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The patent applies biopolymer coatings that fundamentally change the surface parameters of molded pulp. The coating creates a hydrophobic and oleophobic barrier layer, transforming the material from water-absorbent to water-resistant, while the underlying pulp structure remains biodegradable

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The biopolymer coating acts as an intermediary layer between the molded pulp and water/oil substances. This intermediate layer prevents direct contact between water/oil and the hydrophilic pulp fibers, providing protection while allowing the pulp to maintain its biodegradable nature

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If secondary fiber is used for molded pulp production, then production cost is reduced, but safety for food packaging deteriorates due to residual inks and chemicals

Engineering Contradiction:

Improveproduction costVSAvoidfood safety

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent extracts and removes harmful contaminants (inks, chemicals, adhesives) from the fiber source through enhanced pulping and cleaning processes. This extraction of harmful substances allows the use of cost-effective secondary fibers while ensuring food safety compliance

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies surface treatments and coatings that change the chemical parameters of the fiber material. These treatments remove or neutralize residual contaminants and create a food-safe surface barrier, enabling the use of economical secondary fibers for food packaging applications

Inventive Principle:

Principle #35Parameter changes

4Strength

If plastic is used for packaging, then mechanical strength and versatility are improved, but environmental harm and degradation time deteriorate

Engineering Contradiction:

Improvemechanical strengthVSAvoidenvironmental harm

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The patent creates a composite material system combining natural fiber pulp with biopolymer coatings, achieving a balance between mechanical strength and environmental sustainability. The composite structure provides adequate strength for packaging applications while being fully biodegradable, unlike conventional plastics

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the physical and chemical parameters of natural fiber materials through processing and coating to achieve mechanical properties comparable to plastics. The biopolymer coating enhances strength, stiffness, and barrier properties, enabling biodegradable alternatives to perform at plastic levels

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11926965B2Natural fiber composites as a low-cost plastic alternative

Publication Date: 2024.03.12 NORTHEASTERN UNIV (US)

AI summary

Provided herein are mixed pulp compositions comprising a short fiber plant pulp (e.g., sugar cane bagasse) and a long fiber plant pulp (e.g. bamboo fiber). Also provided herein is a process for preparing the compositions.