Core-less Bag Dispenser Packaging with Differential Shrink Wrap
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Solution Overview
Problem
Conventional plastic bag dispensing systems are bulky and heavy due to the need for outer containers, making them inconvenient for carrying, especially in applications like dog waste disposal or infant diaper use, where compactness is essential.
Innovation Solution
A core-less roll packaging system using a differentially shrinking shrink-wrap tube that eliminates the need for end forms, providing stabilization and conformance to the roll shape without undue pressure, and allowing for controlled shrinkage through heat sealing or tenter frame stretching, with a sleeve that can be pre-shaped and formed with an orifice for robust dispensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional outer containers are used to package plastic bags, then the bags are protected and organized, but the package size and weight increase significantly
Solution Approach 1:
The invention extracts and eliminates the heavy outer container and end forms from the packaging system. Instead, a lightweight shrink-wrap film is used to secure the roll, dramatically reducing package weight and bulk while maintaining adequate protection for the plastic bags during transport and storage.
Solution Approach 2:
The invention replaces rigid outer containers and end forms with a flexible shrink-wrap film that conforms to the roll shape. This thin film provides sufficient protection while minimizing package size and weight, enabling convenient portability for the plastic bag dispenser.
2Stability of the object's composition
If end forms are used to stabilize the roll, then the roll structure is reinforced, but the device complexity and packaging material increase
Solution Approach 1:
The invention removes the separate end forms from the packaging system entirely. The shrink-wrap film alone provides sufficient stabilization of the roll structure through proper tensioning and conforming to the roll shape, eliminating unnecessary components and simplifying the overall packaging design.
Solution Approach 2:
The shrink-wrap film performs multiple functions simultaneously: it secures the plastic bags to the roll, stabilizes the roll structure, protects the packaging, and eliminates the need for separate end forms. This multi-functionality reduces device complexity while maintaining roll stability.
3Stability of the object's composition
If uniform shrink-wrap is applied to the roll, then the roll is stabilized, but distortion occurs in larger sections of the roll
Solution Approach 1:
The invention applies local quality by varying the shrink-wrap tension and diameter at different locations along the roll. The shrink-wrap tube has a larger diameter at the ends to accommodate the wider roll sections and a smaller diameter at the center, providing appropriate stabilization without causing distortion in larger sections.
Solution Approach 2:
The invention changes the geometric parameters of the shrink-wrap tube along its length, creating a tapered or differential shrink pattern. This parameter variation allows the shrink-wrap to conform to the roll's shape changes without exerting excessive compressive force on larger sections that would cause distortion.
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 solution results in a compact, lightweight packaging that maintains bag stability and resistance to distortion, reducing waste and packaging material while allowing for easy dispensing and eliminating the need for additional components or complex manufacturing steps.
Implementation Method 1
The sleeve is adapted to provide, upon the application of heat, different predetermined amounts of shrinkage at different portions of the sleeve
Data Source
AI summary
An improved package for core-less rolls of bags provides a shrink-wrap film around the bag having differential shrinkage to better accommodate the roll form.