Electrostatic Handle Bonding for Heat Shrink Film
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Solution Overview
Problem
Existing heat shrink film wrapping methods with external handles face issues such as delamination due to heat and dryness, and the handle strip tends to wander, preventing effective sealing with the wrapping film.
Innovation Solution
An electrostatic bond is created between the handle strip and the heat shrink film, ensuring constant contact and sealing, while also preventing the handle from wandering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a handle is glued on the outside of the pack, then the handle can be easily applied, but the handle tends to delaminate as the load increases due to heat and dryness affecting adhesion
Solution Approach 1:
The handle strip is merged with the wrapping film by creating an electrostatic bond, causing the strip to be completely enclosed inside the wrapping film rather than being glued on the outside. This integration ensures the handle moves with the film and maintains contact under load, preventing delamination while preserving ease of application through the electrostatic bonding process.
Solution Approach 2:
The mechanical glue-based adhesion system is replaced with an electrostatic bonding system. The electrostatic charge creates an attractive force between the handle strip and wrapping film that is not dependent on environmental conditions like heat and dryness, providing reliable adhesion under load without the delamination issues of glued handles.
2Ease of operation
If a handle strip is placed on the wrapping film, then the handle can be formed, but the strip tends to wander and is not always in direct contact with the wrapping film, preventing effective sealing
Solution Approach 1:
The electrostatic bonding system replaces mechanical positioning methods. The electrostatic charge creates an attractive force that actively pulls the handle strip into direct contact with the wrapping film, preventing wandering and ensuring consistent positioning. This eliminates the need for complex mechanical positioning systems while achieving precise strip placement and contact for effective sealing.
Solution Approach 2:
The physical state of the handle strip is changed by imparting an electrostatic charge, which fundamentally alters its interaction with the wrapping film. This parameter change (electrostatic charge) creates a force that actively maintains contact and prevents wandering, ensuring precise positioning and effective sealing without requiring complex mechanical control systems.
3Reliability
If the handle strip is completely enclosed inside the wrapping film through electrostatic bonding, then nearly complete sealing is achieved, but the process requires creating and maintaining electrostatic charges
Solution Approach 1:
The electrostatic bonding system is designed to be self-regulating and self-maintaining. Once the electrostatic charge is created on the handle strip, it automatically maintains contact with the wrapping film and prevents wandering without requiring continuous external control or monitoring. The system serves itself by using the electrostatic force to ensure consistent sealing, reducing the need for complex control mechanisms.
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 electrostatic bonding achieves nearly complete sealing of the handle strip with the wrapping film, enhancing load-bearing capacity and allowing for recyclable film combinations.
Implementation Method 1
The strip is electrostatically bonded to the wrapping film. The electrostatic bonding causes the strip film to stay in almost constant contact with the wrapping film.
Implementation Method 2
The handle strip is made of a material which can thermally adhere to the heat shrink film by sealing (welding) during heat shrinking.
Data Source
AI summary
The objective of this invention is to provide a handle for carrying an article or a bundle of bottles that is more resistant to tearing and delaminating and can carry heavy loads. This is accomplished by placing a strip on the inside of the wrapping material so that the strip that forms the handle is enclosed within the wrapping material. The strip film maintains direct contact with the wrapping film. Direct contact is achieved by electrostatic bonding of the handle film on the wrapping film. Therefor more than 80% of the handle seals to the wrapping film.