Composite Packaging Bag with Elastic Adhesive Layers
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Solution Overview
Problem
Current environment-friendly packaging bags lack sufficient heat preservation and watertightness, are prone to wrinkling and damage during transportation, and offer reduced protection to articles due to low compressive strength and water resistance.
Innovation Solution
A high-strength packaging bag is developed using composite paper with an outer waterproof layer, a heat-insulation and cushioning layer, and an inner waterproof layer, adhered with elastic adhesive layers, along with cushioning structures and a specific adhesive composition to enhance load-bearing properties, heat insulation, and moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If single-layer kraft paper is used for packaging bags, then the packaging bag is light in weight, but the thermal insulation property, waterproof property and compressive strength are low
Solution Approach 1:
The patent uses composite paper made of multiple layers including kraft paper, corrugated paper, and insulation foam layers bonded together. This composite structure combines the light weight advantage of kraft paper with the compressive strength of corrugated paper and the thermal insulation of foam layers, resolving the contradiction between lightweight and high strength requirements.
Solution Approach 2:
The packaging bag is divided into multiple functional layers: outer kraft paper layer, corrugated paper layer for strength, insulation foam layer for thermal protection, and inner lining layer. Each layer performs a specific function, allowing the overall structure to achieve both light weight and high compressive strength through optimized layering.
2Strength
If composite corrugated paper is used for packaging bags, then the compressive strength is improved, but the heat insulation and water resistance are ordinary
Solution Approach 1:
The patent combines corrugated paper layers with insulation foam layers to create a composite structure. The corrugated paper provides compressive strength while the foam layers provide thermal insulation, achieving both high strength and excellent heat insulation properties simultaneously.
Solution Approach 2:
The insulation foam is nested within the corrugated paper structure, with the foam layer positioned inside the corrugated channels. This nested arrangement maximizes the thermal insulation effect while maintaining the structural strength provided by the corrugated paper framework.
3Temperature
If the combination of kraft paper and insulation foam is used for packaging bags, then the thermal insulation performance is good, but the packaging bag is easily wrinkled and damaged during transportation and has low water resistance
Solution Approach 1:
The patent creates a composite structure where kraft paper, corrugated paper, and insulation foam are bonded together with waterproof adhesives. The kraft paper and corrugated paper layers provide structural rigidity that prevents wrinkling, while the waterproof adhesive and optional waterproof coating layers provide water resistance, protecting the foam core during transportation.
Solution Approach 2:
The outer kraft paper layers and waterproof coating films serve as protective shells that enclose and protect the insulation foam core. These flexible yet strong outer layers prevent mechanical damage and wrinkling while maintaining the thermal insulation properties of the foam.
4Ease of manufacture
If the packaging bag lacks sufficient waterproof layer and adhesive strength, then the manufacturing is simple, but the watertightness and heat preservation are insufficient
Solution Approach 1:
The patent uses waterproof adhesives to bond multiple layers including kraft paper, corrugated paper, and insulation foam. The adhesive serves dual functions: providing strong bonding between layers and creating waterproof seals that prevent moisture and air penetration, achieving both manufacturing feasibility and effective protection.
Solution Approach 2:
The waterproof adhesive acts as an intermediary material between the paper layers and foam core. It not only bonds the layers together but also creates waterproof joints and seals, preventing moisture and air flow through the interfaces between different materials.
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 packaging bag effectively prevents air and moisture flow, maintains shape under pressure, and provides enhanced protection against wrinkles and breakage, offering improved heat preservation and watertightness with increased compressive strength.
Implementation Method 1
The heat-insulation and cushioning layer can prevent the flow of air inside and outside, and has a good heat insulation and heat preservation
Implementation Method 2
The first adhesive layer and the second adhesive layer are elastic adhesive layers capable of cooperating with the heat-insulation and cushioning layer. When the packaging bag is subjected to an external pressure, the external pressure is uniformly dispersed and rebounded
Implementation Method 3
The outer waterproof layer and the inner waterproof layer have a waterproof function, blocking the flow of moisture and air
Data Source
AI summary
A high-strength packaging bag with effects of heat preservation and watertightness is made of a composite paper. The composite paper includes an outer waterproof layer, an outer paper layer, a first adhesive layer, a heat-insulation and cushioning layer, a second adhesive layer, an inner paper layer and an inner waterproof layer arranged in sequence; and the first adhesive layer and the second adhesive layer are both elastic adhesive layers.