Gelatin Pallet Adhesive to Replace Plastic Stretch Wrap
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Solution Overview
Problem
Existing adhesive technologies in the paper packaging industry cause paper web breaks and blemishes due to non-biodegradable materials, leading to recycling issues and increased plastic use, while also posing safety hazards and environmental concerns.
Innovation Solution
A biodegradable gelatin-based adhesive that adheres boxes on pallets, eliminating the need for plastic stretch wrap and providing stable pallet loads, is developed, utilizing a formulation of gelatin, glycerin, sugar, and other natural components, which are recyclable and compostable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If non-biodegradable synthetic resin emulsion-based adhesives are used, then strong bonding strength is achieved, but paper web breaks and blemishes occur, and recycling becomes problematic
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive from synthetic resin emulsion to gelatin-based natural adhesive with specific molecular weight ranges (20,000-200,000 Daltons) and controlled pH levels (4.0-6.0), which fundamentally alters the bonding mechanism to be gentler on paper while maintaining adequate strength for pallet stabilization
Solution Approach 2:
The patent creates a composite adhesive formulation combining gelatin with natural additives such as glycerin (1-10 parts), sugar (1-5 parts), and plant-based extracts, which together provide both bonding capability and paper-friendly properties that prevent web breaks and blemishes
2Stability of the object's composition
If plastic stretch wrap is used for pallet protection, then load stability is achieved, but environmental sustainability deteriorates and plastic waste increases
Solution Approach 1:
The patent extracts and eliminates the need for plastic stretch wrap by applying adhesive directly to the pallet and boxes, removing the plastic wrapping layer entirely while achieving the same load stabilization function through adhesive bonding of boxes to the pallet surface
Solution Approach 2:
The patent replaces durable but harmful plastic stretch wrap with a biodegradable adhesive that naturally decomposes after use, accepting short-term application with eventual complete breakdown into harmless substances, thereby eliminating long-term plastic waste accumulation
3Productivity
If hot melt adhesives are used, then rapid bonding is achieved, but worker safety deteriorates due to skin burn hazards
Solution Approach 1:
The patent fundamentally changes the temperature parameter from hot melt adhesive application (typically 80-150°C) to ambient or cool application (20-40°C) with gelatin-based adhesive, maintaining adequate bonding speed through chemical adhesion rather than thermal bonding, thereby eliminating burn hazards while preserving productivity
4Object-generated harmful factors
If biodegradable gelatin-based adhesive is used, then environmental sustainability is improved and plastic use is reduced, but bonding strength may be compromised
Solution Approach 1:
The patent enhances the bonding strength of biodegradable gelatin adhesive by formulating it as a composite material system including gelatin (1-10 parts), glycerin (1-10 parts) for flexibility and extended open time, sugar (1-5 parts) for additional adhesion, and optional natural thickeners, achieving sufficient strength for pallet stabilization while maintaining biodegradability
Solution Approach 2:
The patent applies the adhesive with controlled viscosity (50-5000 cP) and specific application methods (spray, roller, or brush) to optimize local bonding characteristics at the adhesive-substrate interface, ensuring adequate strength where needed while preserving the overall biodegradable nature of the formulation
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 reduces plastic usage by 50-100%, minimizes paper damage, and enhances worker safety by eliminating hot melt skin burns, while being environmentally sustainable and safe for use in food packaging.
Implementation Method 1
Application of the adhesive to boxes adheres the boxes to each other on a pallet
Implementation Method 2
By being biodegradable, the these adhesives allow the materials with which they are used to be recyclable, repulpable and/or compostable
Data Source
AI summary
A biodegradable adhesive containing effective amounts of water; defoamer; gelatin; preservative; glycerin, sorbitol, or a mixture of glycerin and sorbitol; NaCl; and sugar for use in making boxes, and other material, in which the material is recyclable, repulpable, compostable, and the like to improve environmentally friendly packaging and eliminating hazards of using hot adhesives.