Gas Barrier Pressure Sensitive Adhesive Sheet for Contamination Control
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Solution Overview
Problem
Conventional pressure sensitive adhesive sheets for pharmaceutical and food containers face contamination issues due to the diffusion of volatile organic compounds (VOCs) from the adhesive layer and low-molecular-weight components from the printing layer, which are not adequately suppressed by existing solutions.
Innovation Solution
A pressure sensitive adhesive sheet with a gas barrier base material, a thermoplastic elastomer-based adhesive layer, and a print-receiving layer is used, where the barrier base material is positioned between the printing layer and the adherend to prevent migration of components, and the adhesive layer is formed through extrusion to avoid solvent residues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pressure sensitive adhesive sheet is used for pharmaceutical or food containers, then the adhesive function is provided, but volatile organic compounds diffuse from the adhesive layer to contaminate the container and stored products
Solution Approach 1:
A gas barrier layer is introduced as an intermediary between the pressure sensitive adhesive layer and the resin container. This barrier layer specifically blocks the diffusion path of volatile organic compounds from the adhesive layer to the container, while allowing the adhesive to perform its bonding function. The barrier layer acts as a mediator that separates the adhesive function from the contamination risk.
Solution Approach 2:
The pressure sensitive adhesive sheet is constructed as a composite structure comprising multiple layers: a gas barrier layer (such as aluminum foil or metal vapor deposition layer), a pressure sensitive adhesive layer, and optionally a release sheet layer. This composite structure combines the gas barrier properties of metals with the adhesive properties of polymers to achieve both contamination prevention and adhesive functionality.
2Reliability
If a printing layer is added to the pressure sensitive adhesive sheet for product information, then identification function is improved, but low-molecular-weight components from the printing layer migrate to contaminate the container
Solution Approach 1:
The gas barrier layer serves as an intermediary barrier between the printing layer and the resin container. It blocks the migration path of low-molecular-weight components (such as oligomers, monomers, photoinitiators, and solvents) from the printing layer to the container, while allowing the printing layer to provide product identification information.
3Productivity
If flexographic printing with UV ink is used to reduce printing costs and improve efficiency, then productivity is improved, but the amount of binder components increases causing more serious contamination
Solution Approach 1:
The gas barrier layer acts as a mediator that blocks the contamination from flexographic printed binder components. This allows the use of efficient flexographic printing methods while preventing the associated contamination issue, as the barrier layer specifically targets the migration path of binder components to the container.
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 configuration effectively suppresses contamination by reducing VOC diffusion and migration of printing layer components, ensuring the integrity of pharmaceutical and food products stored in resin containers.
Implementation Method 1
a barrier base material having gas barrier properties to water vapor and oxygen
Implementation Method 2
a pressure sensitive adhesive layer laminated on a surface of the barrier base material
Data Source
Figure 1~2
Figure 3
AI summary
[Problems] Objects include providing a pressure sensitive adhesive sheet for an indication label with which the contamination of an adherend can be suppressed. [Solution] A pressure sensitive adhesive sheet (1) for an indication label is provided which comprises a barrier base material (10) having gas barrier properties to water vapor and oxygen and a pressure sensitive adhesive layer (20) laminated on a surface of the barrier base material (10). The pressure sensitive adhesive layer (20) is an extruded product of a pressure sensitive adhesive composition that contains a thermoplastic elastomer.