Heat-Shrinkable Label Ultraviolet Adhesive Activation
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Solution Overview
Problem
Existing methods for applying heat-shrinkable labels to adherends are inefficient, leading to inadequate activation of heat-sensitive adhesive agents and potential deformation or blocking issues, particularly with heat-shrinkable tubular labels, due to low energy efficiency and restricted adhesive agent disposition.
Innovation Solution
A process involving a heat-shrinkable label with a slipping layer and a heat-sensitive adhesive layer containing an ultraviolet-absorbing heating agent, where the label is applied to an adherend and activated through ultraviolet irradiation, allowing for efficient and uniform adhesive activation without deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If steam or heated air is used to heat the heat-sensitive adhesive agent, then the adhesive agent can be activated, but the energy efficiency is low and running cost is high
Solution Approach 1:
The patent replaces the conventional thermal heating system (steam or heated air) with a laser heating system. The laser beam directly irradiates the heat-sensitive adhesive agent, converting optical energy to thermal energy locally at the adhesive layer. This substitution eliminates the need for large-sized thermal heating facilities and prevents energy loss to the atmosphere, significantly improving energy efficiency.
Solution Approach 2:
The patent introduces a light-absorbing substance (carbon black or metal powder) as an intermediary in the heat-sensitive adhesive agent. This substance absorbs laser energy and converts it to heat, which then activates the adhesive. The intermediary enables efficient energy transfer from the laser to the adhesive, solving the energy efficiency problem while maintaining effective adhesive activation.
2Reliability
If the heat-sensitive adhesive agent is disposed at shifted positions to prevent blocking, then blocking is prevented, but the adhesive agent cannot be disposed at desired positions and adhesion is insufficient
Solution Approach 1:
The patent replaces conventional thermal heating with laser heating, which provides precise spatial control over where heat is generated. The laser can be focused exactly on the adhesive agent location, regardless of its position on the label. This precise heating control eliminates the need to shift adhesive positions to prevent blocking, allowing adhesive to be placed at optimal locations for both bonding strength and blocking prevention.
Solution Approach 2:
The patent changes the heating parameter from diffuse thermal energy (steam/air) to concentrated laser energy. This parameter change enables selective heating of only the adhesive agent area, preventing heat-induced blocking while maintaining adequate adhesive disposition. The laser's concentrated energy delivery allows the adhesive to remain in optimal positions without experiencing the uniform heating that causes blocking in conventional methods.
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
This method enables cost-effective, efficient adhesion of heat-shrinkable labels to adherends, preventing deformation and blocking while ensuring a favorable appearance, by sufficiently activating the heat-sensitive adhesive layer using ultraviolet light.
Implementation Method 1
a heat-sensitive adhesive layer provided on a back surface of the label base, and that contains an ultraviolet-absorbing heating agent in the slipping layer
Implementation Method 2
activating the heat-sensitive adhesive layer through ultraviolet irradiation
Implementation Method 3
the label base is thermally shrunk by heating, and the heat-sensitive adhesive agent is activated by heating as well
Data Source
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AI summary
The present invention bonds a label to an adherend with a heat-sensitive adhesive layer disposed therebetween, by sufficiently activating the heat-sensitive adhesive layer. Prepared is a label 1 which comprises a label base 4 and a heat-sensitive adhesive layer 3 disposed on the back surface of the label base 4, wherein an ultraviolet-absorbing heating agent is contained in an area of the label base 4 which at least includes the disposed heat-sensitive adhesive layer 3 and/or in the heat-sensitive adhesive layer 3. Before or after the label 1 is applied to an adherend 9, irradiation with ultraviolet is conducted to activate the heat-sensitive adhesive layer 3.