Digital Printing on Curved Plastic Containers
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Solution Overview
Problem
Conventional techniques for printing on curved surface plastic containers face challenges in providing commercially acceptable images, efficient base coating, and cost-effective multi-color digital printing at acceptable speeds.
Innovation Solution
A system comprising a printing subsystem with movable print heads, temperature control, and scanning devices to apply ink droplets on a medium applied to the container, allowing for precise positioning and controlled ink delivery, enabling efficient digital image printing on non-planar surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional printing techniques are used on curved surface plastic containers, then the container can be produced, but the image quality is not commercially acceptable
Solution Approach 1:
The printing system is divided into multiple independent print heads, each responsible for specific color channels (e.g., CMYK). This segmentation allows precise control of ink deposition on curved surfaces while maintaining image quality and enabling parallel processing to improve manufacturing efficiency.
Solution Approach 2:
The print heads are made movable along the container surface, allowing dynamic adjustment of printing positions to accommodate curved geometries. This dynamic positioning system enables high-quality image placement on non-planar surfaces while maintaining manufacturing flexibility.
2Reliability
If base coating is applied to curved surfaces before printing, then subsequent digital printing can be performed, but the base coating process is inefficient and costly
Solution Approach 1:
The base coating function is extracted from the traditional pre-treatment process and integrated directly into the printing system. The print heads can deposit both base coat and image ink in a single pass, eliminating separate base coating equipment and improving productivity while ensuring reliable surface preparation.
Solution Approach 2:
The base coating and digital printing operations are merged into a single integrated process. The same printing system that applies the digital image also applies the base coat, reducing process steps, equipment requirements, and manufacturing costs while maintaining reliable surface preparation.
3Adaptability or versatility
If multi-color digital printing is performed on plastic containers, then customizable images can be produced, but the printing speed and cost are not acceptable
Solution Approach 1:
The printing system uses periodic pulsing of ink delivery to multiple print heads in a coordinated sequence. This periodic action allows multi-color deposition at high speeds by synchronizing ink ejection cycles with container movement, maintaining customization capability while improving printing speed and cost efficiency.
Solution Approach 2:
The printing process operates continuously as containers move through the printing zone, with multiple print heads working in parallel without interruption. This continuous operation eliminates stopping and starting, maintaining high productivity while enabling full-color digital printing with customizable images.
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
Enables high-quality, multi-color digital image printing on curved surfaces with customizable options, improving efficiency and reducing costs by allowing for just-in-time labeling of containers, even after filling.
Implementation Method 1
an ink delivery device for delivering one or more types or colors of ink to one or more print heads
Implementation Method 2
a print head for applying droplets of ink to a container surface
Data Source
AI summary
A plastic container includes a medium applied to a portion of the container. A digital image is applied to a portion of the medium, the digital image being comprised of a plurality of ink droplets. Methods for digital printing on a portion of a medium that is applied to a container are also disclosed.