HDPE Bag Grip Strip Co-Extrusion for Opening
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Solution Overview
Problem
Plastic bags made of high-density polyethylene (HDPE) are difficult to open due to their low surface coefficient of friction, leading to sticking issues between panels, and existing solutions like embossment or non-slip coatings either weaken the film or require additional processes and materials.
Innovation Solution
A plastic bag design featuring co-extruded grip strips made from a material with a higher coefficient of friction than the HDPE panels, which are integrated horizontally or vertically along the edges to facilitate easy opening, using polyethylenes of different densities or surface modification agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If embossment or piercing is used to enhance gripping, then ease of opening is improved, but strength of the film is weakened
Solution Approach 1:
The patent applies a non-slip coating only to specific regions of the bag (such as the top edge or handle areas) rather than the entire surface. This localized application provides enhanced gripping capability where needed while preserving the inherent strength and integrity of the rest of the film structure.
Solution Approach 2:
The invention combines the HDPE film material with a non-slip coating material to create a composite surface structure. The coating layer provides high friction properties for easy opening, while the underlying HDPE film maintains its structural strength and load-bearing capacity.
2Ease of operation
If a non-slip coating is applied to enhance gripping, then ease of opening is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The non-slip coating application is integrated into the existing bag manufacturing process, combining the coating step with the film formation or finishing operations. This merging of processes eliminates the need for separate coating equipment and operations, thereby reducing manufacturing complexity while still providing the non-slip surface enhancement.
Solution Approach 2:
The coating material is designed to be applied in a manner that leverages existing manufacturing infrastructure and capabilities. The process utilizes available equipment and materials within the current manufacturing system, requiring minimal additional investment or process reconfiguration.
3Ease of operation
If embossment is used to enhance gripping, then ease of opening is improved, but strength of the film is weakened
Solution Approach 1:
The patent applies a non-slip coating only to specific regions of the bag (such as the top edge or handle areas) rather than the entire surface. This localized application provides enhanced gripping capability where needed while preserving the inherent strength and integrity of the rest of the film structure.
Solution Approach 2:
The invention combines the HDPE film material with a non-slip coating material to create a composite surface structure. The coating layer provides high friction properties for easy opening, while the underlying HDPE film maintains its structural strength and load-bearing capacity.
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 grip strips enable easy identification and separation of the bag panels for opening, maintaining the strength of the film while providing a clear grip for users, and can be integrated into existing manufacturing processes without adding extra steps or materials.
Implementation Method 1
at least one grip strip having a coefficient of friction higher than a coefficient of friction of the panel
Data Source
AI summary
A plastic bag comprising a grip strip configured to assist with opening the bag, wherein the grip strip is formed from a material different from a material from which its associated panel is formed.