Plastic Label Antistatic Layer for Aqueous Ink Roll Storage
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Solution Overview
Problem
Plastic labels with printed layers formed from aqueous ink suffer from deteriorated antistatic properties over time due to the migration of antistatic agents from the antistatic layer to the printed layer during storage and transport as a roll body.
Innovation Solution
A plastic label design with a printed layer on one surface and an antistatic layer on the other, where the antistatic layer maintains a surface resistivity of less than 1.0×10^12 Ω/□ after 96 hours of contact under specific conditions, using an antistatic agent like alkyl ammonium chloride.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a printed layer formed from aqueous ink is used on the label, then environmental suitability and printability are improved, but the antistatic property deteriorates with time due to migration of the antistatic agent to the printed layer
Solution Approach 1:
The invention changes the chemical parameters of the aqueous ink by specifying a pH range of 4.0 or lower. This acidic environment prevents the migration of the antistatic agent to the printed layer, thereby maintaining the antistatic property while still using environmentally friendly aqueous ink for printing
Solution Approach 2:
The invention creates a composite structure where the printed layer and antistatic layer are combined on the label. By controlling the pH of the aqueous ink and specifying particular antistatic agents, the composite material maintains both the environmental benefits of aqueous printing and the functional benefits of antistatic protection
2Ease of manufacture
If the label is stored and transported as a roll body with the printed layer and antistatic layer in contact, then manufacturing and handling are simplified, but the antistatic agent migrates to the printed layer causing loss of antistatic function
Solution Approach 1:
The invention applies preliminary anti-action by adjusting the pH of the aqueous ink to 4.0 or lower before storage. This pre-established acidic condition creates a barrier that prevents the antistatic agent from migrating to the printed layer during roll storage and transport, thereby preserving the antistatic function
Solution Approach 2:
The invention changes the pH parameter of the aqueous ink system to create a stable environment that prevents chemical migration. This parameter control allows the label to be stored as a roll body without compromising the antistatic property
3Productivity
If containers are supplied to the manufacturing line, then production proceeds efficiently, but static electricity causes lightweight containers to be attracted or stuck together resulting in misalignment and conveyance failure
Solution Approach 1:
The invention extracts the harmful static electricity effect by applying the antistatic layer to the label. This layer, when maintained at appropriate pH levels, actively removes or neutralizes static charge buildup on the label surface, preventing the attraction and sticking of lightweight containers during conveyance
Solution Approach 2:
The antistatic layer provides self-service by automatically dissipating static electricity charges on the label surface. This continuous self-neutralization prevents container attraction and ensures smooth conveyance through the manufacturing line without requiring additional external interventions
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 label maintains sufficient antistatic properties, preventing static-induced issues such as conveyance failure, label cutting deviations, and jamming, even on lightweight containers.
Implementation Method 1
the antistatic layer has a surface resistivity of less than 1.0×10^12Ω/□
Implementation Method 2
the antistatic agent contained in the anastatic layer moves to (dissolves in) the printed layer formed from an aqueous ink
Implementation Method 3
the raw material for the plastic label is manufactured as a roll body in which the raw material is wound, in a roll shape, around an outer periphery of a winding core
Data Source
AI summary
To provide a plastic label having a sufficient antistatic property even when the plastic label has a printed layer formed from an aqueous ink. A plastic label including: a printed layer on one surface of a label base material including a plastic film; and an antistatic layer on the other surface thereof, wherein the printed layer is a printed layer formed from an aqueous ink, the antistatic layer contains an antistatic agent, and the antistatic layer has a surface resistivity of less than 1.0×1012Ω/□ under an atmosphere of 25° C. and 50% relative humidity after the printed layer and the antistatic layer are held in contact with each other at 0.025 MPa for 96 hours.