Non-uniform Tail Sealing with Phase-Change Material
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Solution Overview
Problem
Conventional tail sealing methods for convolutely wound logs in rolled web products face issues such as inadequate bond strength, slow adhesive drying, and inability to adjust bond strength post-manufacturing, leading to processing difficulties and consumer frustration.
Innovation Solution
A non-uniform tail sealing method using a nonadhesive phase-change material (PCM) applied in a specific pattern to provide sufficient bonding for manufacturing processes while allowing for easy separation by consumers, with the bond strength adjustable through phase change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive-based materials are used to seal the tail to the body, then bond strength is improved for downstream manufacturing processes, but the adhesive dries slowly and continues to strengthen after packaging, making consumer separation difficult
Solution Approach 1:
The patent applies parameter changes by using a bonding material whose physical or chemical state changes over time. Specifically, the bonding material transitions from an initial high-bond state suitable for manufacturing to a reduced-bond state suitable for consumer use, allowing the bond strength parameter to be dynamically adjusted rather than fixed
Solution Approach 2:
The bonding material is designed to be dynamic rather than static in its bond strength characteristics. The bond strength evolves over time from strong during manufacturing to weaker during consumer use, enabling the system to adapt its bonding properties to different operational requirements at different times
2Reliability
If high bond strength adhesive is applied to ensure strong sealing, then downstream processing is facilitated, but consumer separation of tail from body becomes difficult and may cause web material tearing
Solution Approach 1:
The bonding material dynamically adjusts bond strength over time, being strong during manufacturing for processing reliability, then becoming weaker to facilitate consumer separation without causing web material tearing
Solution Approach 2:
The bond strength parameter is changed over time through phase transition of the bonding material, transitioning from high bond strength for manufacturing reliability to reduced bond strength for consumer ease of operation
3Ease of manufacture
If conventional adhesive-based bonding is used, then tail sealing is achieved, but the bond cannot be reduced post-manufacturing, leading to consumer frustration
Solution Approach 1:
The bonding material transitions from a static high-bond state during manufacturing to a dynamic reduced-bond state after manufacturing, enabling adaptability to different operational requirements at different times
Solution Approach 2:
The bonding material utilizes phase transition (e.g., from amorphous to crystalline state or vice versa) to control bond strength, allowing the material to be in one phase during manufacturing for strong bonding, then transitioning to another phase for reduced bonding
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 method ensures strong initial bond for manufacturing processes and reduces bond strength post-manufacturing, facilitating easy separation and reducing product waste and consumer dissatisfaction.
Implementation Method 1
A non-uniform tail sealing method using a nonadhesive phase-change material (PCM) applied in a specific pattern to provide sufficient bonding for manufacturing processes while allowing for easy separation by consumers, with the bond strength adjustable through phase change.
Data Source
AI summary
A consumer width sized roll comprising wound web material comprising a tail. The tail may comprise a bonding material. The bonding material may be arranged in a non-uniform pattern.