Plasma Barrier Layer for Direct Printing on PET Containers
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Solution Overview
Problem
Direct printing of decorative inscriptions on plastic containers in the food industry faces challenges due to ink migration through porous container materials like PET, risking contamination of contents with toxic chemical compounds.
Innovation Solution
A method involving plasma-assisted chemical vapor deposition to form a thin barrier layer on the inner surface of containers, combined with direct printing of inks on the outer surface, preventing ink migration and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If direct printing is used on plastic containers, then labeling cost is reduced and aesthetic appearance is improved, but ink migration through porous container walls causes contamination of contents
Solution Approach 1:
A barrier layer is deposited on the inner surface of the container to act as an intermediary between the porous container wall and the ink on the outer surface. This barrier layer prevents ink components from migrating through the container wall while allowing direct printing to proceed on the outer surface without contamination risk.
Solution Approach 2:
A thin barrier layer is formed on the inner surface of the container through plasma-assisted chemical vapor deposition. This thin film provides effective protection against ink migration while maintaining the container's structural integrity and not interfering with the direct printing process on the outer surface.
2Object-affected harmful factors
If plasma-assisted chemical vapor deposition is used to form a barrier layer, then ink migration is prevented, but manufacturing process complexity increases
Solution Approach 1:
The barrier layer formation process is integrated into the existing blow molding process by positioning the plasma treatment zone within or adjacent to the molding machine. This allows the barrier layer to be deposited on containers during or immediately after formation, combining two operations into one continuous process and avoiding the need for separate barrier layer application equipment.
Solution Approach 2:
The plasma treatment process uses the container's own geometry and the blow molding process's inherent characteristics to enable barrier layer deposition. The container is treated in situ without requiring removal or special handling, and the process leverages the container's own structure (its inner surface area and shape) to receive the barrier layer coating.
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 barrier layer effectively prevents the migration of toxic compounds, ensuring the contents' safety and maintaining organoleptic properties while allowing for aesthetically pleasing and personalized direct printing.
Implementation Method 1
A treatment operation is provided for treating an inner surface of the container, during which a thin barrier layer is formed on the inner surface by plasma-assisted chemical vapor deposition
Data Source
AI summary
Disclosed is a method for manufacturing packaging including a container. The method includes: an operation of forming the container via blow molding or stretch blow molding from a plastics preform, an operation of treating an inner surface of the container, during which a thin barrier layer is formed on the inner surface via plasma-enhanced chemical vapor deposition; an operation of printing on an outer surface of the container, during which ink is deposited on the outer surface to form a decorative and/or informative inscription thereon.