Inkjet Print Stitch Placement for Absorbent Article Substrates
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Solution Overview
Problem
Inkjet printing processes for absorbent article components often result in visibly noticeable stitch lines due to misalignment of printheads, especially at high production speeds and on extensible substrates, detracting from the aesthetic quality of the printed regions.
Innovation Solution
A method involving two printheads that eject ink to define coterminous printed zones along the cross direction, with a print stitch line in the machine direction, allowing the substrate to be manipulated to hide or obscure the stitch line, reducing visible inconsistencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple printheads are arranged along the cross direction to print wider designs, then the print width capability is improved, but visible stitch lines appear due to misalignment between printheads
Solution Approach 1:
The patent applies preliminary action by pre-positioning the print stitch line at a location that will coincide with a future fold line or cut line. This advance planning ensures that the stitch line, which would otherwise be visible, is strategically placed where it will be hidden by subsequent manufacturing operations. The controller is programmed to calculate and set the printhead offsets before printing begins, preventing alignment issues rather than correcting them afterward.
Solution Approach 2:
The patent extracts the problematic stitch line from the visible printed design area by positioning it at the edge of the print zone or at locations that will be removed or hidden during folding/cutting operations. This separates the aesthetic requirements of the printed design from the technical requirements of multi-printhead alignment, allowing the stitch line to exist without compromising the visual quality of the final product.
2Manufacturing precision
If multiple printheads are used to achieve desired print resolution and color, then the print quality is improved, but the complexity of printhead arrangement and alignment increases
Solution Approach 1:
The patent changes the parameter of printhead positioning by allowing dynamic adjustment of printhead offsets in the machine direction and cross direction. The controller can modify these parameters based on the specific design requirements, substrate properties, and production speed, optimizing the alignment of multiple printheads for each printing job without requiring physical reconfiguration of the printhead array.
Solution Approach 2:
The patent creates a universal printing system that can handle various print widths, colors, and resolutions using the same multi-printhead apparatus. The controller is designed to manage different printhead configurations and stitching scenarios, making the system adaptable to different product requirements without needing dedicated setups for each printing task.
3Productivity
If printing is performed at high production speeds on extensible substrates, then the productivity is improved, but the alignment between printed zones from different printheads becomes offset
Solution Approach 1:
The patent applies dynamics by making the printhead positioning system adaptive and responsive to real-time conditions. The controller can dynamically adjust printhead offsets during operation to compensate for substrate extension and high-speed movement. This dynamic adjustment capability allows the system to maintain print alignment despite the challenges of high-speed printing on extensible materials like nonwovens.
4Stability of the object's composition
If printheads are arranged to print coterminous zones along the cross direction, then the contiguous design is achieved, but the stitch line becomes visible when substrate manipulation occurs
Solution Approach 1:
The patent applies preliminary action by pre-positioning the print stitch line at a location that will coincide with a future fold line or cut line. This advance planning ensures that the stitch line, which would otherwise be visible, is strategically placed where it will be hidden by subsequent manufacturing operations. The controller is programmed to calculate and set the printhead offsets before printing begins, preventing alignment issues rather than correcting them afterward.
Data Source
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AI summary
The present disclosure relates to methods for printing absorbent article substrates. Printing systems herein may include a first printhead and a second printhead, wherein a substrate advances under the first and second printheads. The first printhead ejects ink onto the substrate to define a first printed zone, and the second printhead ejects ink onto the substrate to define a second printed zone. The first printed zone and the second printed zone together define a printed region. The first and second printed zones may be coterminous along respective edges to define a print stitch line extending in the machine direction. The substrate may then be manipulated proximate the print stitch line during a manufacturing process. Positioning the print stitch line proximate a region subject to manipulation may help hide and/or obscure the print stitch line from view. In turn, noticeable visible results of imprecise and/or inconsistent printing operations may be reduced.