Foamed Polyolefin Laminate Packaging Bag Impact Absorption
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Solution Overview
Problem
Packaging bags made of kraft paper and plastic air bubble wrap sheets fail to adequately protect fragile contents from impact and can cause indentations due to the bubbles, leading to a need for improved cushioning solutions that prevent damage without indentation.
Innovation Solution
A packaging bag design featuring a laminate structure with a paper substrate and a foamed polyolefin sheet, where the foamed sheet has a thickness of 0.8 mm to 5.0 mm and an expansion ratio of 15 to 50 times, and the paper substrate has a bending stiffness of 150 mN to 700 mN, providing effective impact absorption without indentation and enhanced protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a plastic air bubble wrap sheet is used as a cushioning material, then the packaging bag can provide cushioning function, but the contents may have indentations made by the bubbles
Solution Approach 1:
The patent replaces the plastic air bubble wrap sheet with a foamed sheet having a porous structure. The foam material provides cushioning through its cellular structure that compresses under impact, eliminating the indentation problem caused by discrete bubbles while maintaining the protective function.
Solution Approach 2:
The patent specifies precise parameter ranges for the foamed sheet (thickness: 0.8-5.0 mm, expansion ratio: 15-50 times) and the paper substrate (bending stiffness: 150-700 mN) to optimize both the cushioning performance and the prevention of content indentation, ensuring reliable protection without the harmful effects of bubble wrap.
2Reliability
If the paper substrate has high bending stiffness to resist collapse during drop, then the packaging bag can better protect contents, but the processing of the laminate becomes laborious
Solution Approach 1:
The patent defines an optimal range for the bending stiffness of the paper substrate (150-700 mN) that balances structural integrity during drop with manufacturability. This parameter optimization ensures the substrate is stiff enough to prevent collapse and protect contents, yet flexible enough to allow practical processing and formation of the packaging bag.
3Ease of manufacture
If a plastic air bubble wrap sheet is laminated on kraft paper, then the packaging bag can be formed, but the strength may be low causing drop impact to be transferred to contents
Solution Approach 1:
The patent creates a composite laminate structure consisting of a paper substrate and a foamed sheet with specific properties (thickness: 0.8-5.0 mm, expansion ratio: 15-50 times). This composite structure combines the formability of paper with the cushioning and strength enhancement of the foamed material, resulting in a packaging bag that is both easy to manufacture and strong enough to protect contents from drop impact.
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 laminate structure effectively absorbs impact, preventing damage to contents and reducing the likelihood of indentation, while maintaining flexibility to absorb drops and maintain the integrity of the packaging bag.
Implementation Method 1
a foamed sheet made of polyolefin resin laminated on an inner side relative to the paper substrate, wherein a thickness of the foamed sheet is in a range of 0.8 mm to 5.0 mm, an expansion ratio of the foamed sheet is in a range of 15 to 50 times
Implementation Method 2
a bending stiffness of the paper substrate in an MD direction is in a range of 150 mN to 700 mN
Data Source
AI summary
The packaging bag is a packaging bag made of a laminate formed in a bag shape, the laminate being composed of a paper substrate, a foamed sheet made of polyolefin resin laminated on an inner side relative to the paper substrate, and a sealant layer laminated on an inner side relative to the foamed sheet, which are laminated with the sealant layer facing inward. In the packaging bag, a thickness of the foamed sheet is in a range of 0.8 mm to 5.0 mm, an expansion ratio of the foamed sheet is in a range of 15 to 50 times, and a bending stiffness of the paper substrate in an MD direction is in a range of 150 mN to 700 mN.