Core-less Roll Bag Dispenser with Shrink-wrap Sleeve
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Solution Overview
Problem
Conventional plastic bag dispensing systems are bulky and heavy due to the need for additional packaging, making them inconvenient for carrying in small spaces, such as purses, for applications like dog waste or infant diaper disposal.
Innovation Solution
A compact, lightweight dispensing system using a core-less roll of plastic bags wrapped in heat-shrink film, eliminating the need for external packaging, with a heat-shrink sleeve providing support and protection, and a central opening for easy bag removal, along with optional end-forms for enhanced protection and aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional packaging containers are used to hold compacted plastic bags, then the bags are protected during shipping, but the package size and weight increase substantially, making it too bulky and heavy for convenient carrying
Solution Approach 1:
The patent removes the traditional outer cardboard or rigid container entirely, extracting only the essential protective function and replacing it with a lightweight shrink-wrap film that conforms directly to the compacted bag roll, eliminating unnecessary packaging weight and bulk
Solution Approach 2:
The patent employs a shrink-wrap film—a flexible thin film—that provides protective enclosure while adding minimal weight and bulk compared to conventional rigid containers, allowing the package to be compact and lightweight yet still protected during shipping
2Reliability
If conventional packaging containers are used to hold compacted plastic bags, then the bags are protected during shipping, but the package size and weight increase substantially, making it too bulky for convenient carrying
Solution Approach 1:
The patent removes the traditional outer cardboard or rigid container entirely, extracting only the essential protective function and replacing it with a lightweight shrink-wrap film that conforms directly to the compacted bag roll, eliminating unnecessary packaging volume
Solution Approach 2:
The patent employs a shrink-wrap film—a flexible thin film—that provides protective enclosure while adding minimal volume, allowing the package to be compact and space-efficient yet still protected during shipping
3Weight of stationary object
If plastic bags are held together only by electrostatic or similar attraction, then the package is compact and lightweight, but the bags may separate under shock during shipping
Solution Approach 1:
The patent combines multiple retention mechanisms: electrostatic attraction between the plastic bags and the shrink-wrap film, plus mechanical friction from the tight conformal fit of the shrink-wrap, providing redundant protection against bag separation during shipping shocks
Solution Approach 2:
The shrink-wrap film acts as a flexible protective shell that conforms tightly to the compacted bag roll, providing mechanical constraint and friction-based retention that supplements electrostatic attraction, preventing bag separation under shock while adding minimal weight
4Volume of moving object
If a core-less roll design is used, then the package is more compact and eliminates additional packaging, but the structure requires reinforcement to maintain integrity during shipping
Solution Approach 1:
The shrink-wrap film serves as a flexible structural shell that reinforces the core-less roll design, providing external support and maintaining the compact cylindrical shape during shipping while allowing the package to remain lightweight and compact
Solution Approach 2:
The patent creates a composite structure where the shrink-wrap film (one material) reinforces the compacted plastic bags (another material), combining their properties to achieve both compactness and structural integrity without requiring a separate core or additional packaging
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 provides a compact, lightweight, and efficient dispensing system that reduces waste and bulk, ensuring sequential bag dispensing without tearing and maintaining adhesion between bags, while being resistant to shock and deformation during shipping.
Implementation Method 1
A plastic sleeve of heat-shrink material is heated to conform about an outer periphery of the core-less roll
Implementation Method 2
The core-less roll may provide bags that are held to each other only by electrostatic or similar attraction
Data Source
AI summary
A dispensing package for plastic bags provides a core-less roll supporting on its outer surface a shrink-wrap sleeve providing the walls of the package. Upper and lower end forms being relatively more rigid than the shrink-wrap sleeve may be placed against the upper and lower edges of the core-less roll to provide improved robustness in shipping and package aesthetics.