Additive Liquid Enhances Expandable Adhesive Expansion in Padded Mailers

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Solution Overview

Problem

Padded mailers are typically made from non-recyclable plastic materials, which poses environmental concerns, and reducing the amount of expandable adhesive used in their production slows down manufacturing processes, affecting production speed and material efficiency.

Innovation Solution

The use of an expandable adhesive within paper-based web panels, combined with an additive liquid containing polar molecules, allows for the formation of recyclable padded mailers with reduced material usage while maintaining production speed by optimizing the expansion process in an oven.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If the amount of expandable adhesive is reduced to lower material costs, then material efficiency is improved, but the expansion time increases which reduces production speed

Engineering Contradiction:

Improveamount of expandable adhesiveVSAvoidproduction speed

Core Design Contradiction:

Quantity of substanceVSProductivity

Solution Approach 1:

Polar molecules are introduced as an intermediary substance that facilitates the expansion process of the expandable adhesive. These polar molecules accelerate the expansion reaction, allowing less adhesive to expand to the desired thickness within the same time frame, thus resolving the contradiction between material reduction and production speed maintenance

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The chemical composition parameters of the adhesive system are changed by adding polar molecules that have high dielectric loss factors. This parameter change enables the adhesive to expand more rapidly under the same electromagnetic energy input, allowing reduced adhesive quantity to achieve the same expansion result in the same time

Inventive Principle:

Principle #35Parameter changes

2Strength

If traditional plastic padding is used to ensure adequate cushioning, then protection performance is improved, but recyclability deteriorates

Engineering Contradiction:

Improvecushioning protectionVSAvoidenvironmental harm from non-recyclable plastic

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The material composition is changed from traditional plastic foam to an expandable adhesive system that can be applied in liquid form and then expanded in-situ. This parameter change enables the use of recyclable paper-based materials while achieving the same cushioning protection through the expansion and foaming of the adhesive

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The padding is formed as a composite structure combining paper-based web materials with expandable adhesive. This composite approach allows the use of recyclable paper materials for the structural components while the adhesive provides the cushioning function, eliminating the need for non-recyclable plastic materials

Inventive Principle:

Principle #40Composite materials

3Manufacturing precision

If more expandable adhesive is applied to achieve desired thickness, then padding quality is improved, but production time increases which reduces manufacturing efficiency

Engineering Contradiction:

Improvepadding thickness uniformityVSAvoidexpansion time in oven

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

Polar molecules serve as a catalyst or intermediary that speeds up the expansion kinetics of the adhesive. This intermediary substance enables thinner adhesive applications to reach the desired thickness faster, improving both precision and reducing time loss in the manufacturing process

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

This approach enables the creation of recyclable padded mailers with reduced material costs and increased production efficiency, as the additive liquid enhances the expansion of the adhesive to achieve desired thickness within the same time frame as traditional methods, allowing for faster processing and maintaining production rates.

Implementation Method 1

the additive liquid includes polar molecules (such as from water) that, when energized (such as from energy of an oven), excite to cause the expansion of the expandable adhesive

Methodology Applied

Scientific EffectDielectric heating: Dielectric Heating

Implementation Method 2

the expandable adhesive expands in thickness within the internal pouch to form padding for the panel of the padded mailer

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS20220288913A1Additive application systems and methods for padded mailers

Publication Date: 2022.09.15 GEORGIA PACIFIC CORRUGATED LLC

AI summary

An additive application system utilized to form a padded mailer is provided, along with corresponding methods and systems. The system applies an additive liquid to a portion of a first web that, along with a second web, forms a panel of the padded mailer. After contact occurs, an internal pouch for the panel is formed. When the additive liquid and expandable adhesive positioned within the internal pouch are energized via an oven, the expandable adhesive expands in thickness within the internal pouch to form padding for the panel. Utilizing additive liquid enables use of less expandable adhesive while maintaining a desired speed of operation of the oven to still produce a desired thickness for the padding. Cooling may be applied after expansion in the oven to retain thickness expansion in the padding.