Tail Sealing Using Phase-Change Material for Log Bonding
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Solution Overview
Problem
Existing tail sealing systems for convolutely wound logs face issues with adhesive bond strength being either too low for manufacturing processes or too high for consumer use, leading to processing difficulties and product wastage, with adhesives drying slowly and lacking reversibility.
Innovation Solution
A method using a nonadhesive phase-change material in an amorphous phase applied to the web material to create a bond between the tail and the body of the log, which can be selectively increased or decreased based on processing needs, allowing for easier consumer separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive-based tail sealing is used to provide sufficient bond strength for downstream converting operations, then the bond strength is improved for manufacturing processes, but the bond becomes too strong for consumers to easily separate the tail from the body
Solution Approach 1:
The invention changes the physical-chemical parameters of the bonding material by using a phase-change material that transitions from a solid bonding phase during manufacturing to a reversible phase after manufacturing. This allows the bond strength parameter to be dynamically adjusted: high strength during converting operations, then reduced strength for consumer use, resolving the contradiction between manufacturing requirements and consumer ease of use
Solution Approach 2:
The invention applies phase transition technology by utilizing a material that changes phase based on environmental conditions (temperature, humidity, time). The material bonds strongly in the initial phase for manufacturing, then transitions to a different phase that reduces bond strength, enabling easy separation by consumers. This phase transition mechanism directly addresses the contradiction by providing different bond characteristics at different stages of the product lifecycle
2Strength
If conventional adhesives are used to ensure adequate bonding during manufacturing, then the bond strength is sufficient for converting operations, but the drying time becomes excessively long (more than an hour)
Solution Approach 1:
The invention changes the fundamental bonding mechanism from chemical adhesive drying to physical phase-change bonding. This parameter change eliminates the slow evaporation-drying process of conventional adhesives and replaces it with a rapid phase-transition mechanism that achieves full bond strength in minutes, dramatically reducing the time loss during manufacturing while maintaining adequate bond strength
3Reliability
If strong adhesive bonding is used to prevent unwanted unwinding during processing, then the reliability of the tail seal is improved, but the web material may tear when consumers attempt to separate the tail from the body
Solution Approach 1:
The invention uses phase transition to create a time-dependent bond that is strong during manufacturing (ensuring reliability) but becomes weaker under consumer use conditions. The material transitions from a bonding phase that prevents unwanted unwinding during processing to a separated phase that allows easy, damage-free removal by consumers, eliminating the harmful effect of web tearing while maintaining processing reliability
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 provides sufficient bond strength for manufacturing while allowing consumers to easily separate the tail from the body, reducing product wastage and improving user experience by controlling bond strength over time.
Implementation Method 1
providing a nonadhesive phase-change material in an amorphous phase; and applying the nonadhesive phase-change material in the amorphous phase to the web material at an application site proximate to the tail. The nonadhesive phase-change material alters to a non-amorphous phase to create a bond between the tail and the body
Data Source
AI summary
A method for bonding the tail of a convolutely wound log to the body is provided. The method comprises the use of a nonadhesive phase-change material to mechanically bond the tail to the wound log. The nonadhesive phase-change material is heated to an amorphous state prior to its application. Once applied to the wound log, the nonadhesive phase-change material mechanical bonds with the tail and wound log and as heat is lost, changes to a non-amorphous state. The mechanical bond can be selectively reversed through the application of a strength degradation accelerator.