Printing device, method for producing printed textile item, and printing system
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Solution Overview
Problem
Existing printing technologies require multiple inks with different washing fastness levels to erase and retain images on textiles, necessitating additional ink usage.
Innovation Solution
A printing device and method that adjusts the weight ratio of a pretreatment liquid to ink to achieve varying washing fastness levels, allowing a single ink system to print images that can be selectively erased or retained through washing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple inks with different washing fastness levels are used to print erasable and retainable images, then the image erasure function is achieved, but the device complexity and ink variety increase
Solution Approach 1:
The patent changes the parameter of pretreatment liquid-to-ink weight ratio to achieve different washing fastness levels. By adjusting this ratio, the same ink can produce images with varying durability, eliminating the need for multiple ink types. The control section manages this ratio to create both erasable and retainable images using a single ink supply.
Solution Approach 2:
The patent makes a single ink system perform multiple functions by combining it with variable pretreatment liquid ratios. The same ink can produce both permanently retainable images and temporarily erasable images depending on the pretreatment liquid amount, reducing the need for specialized inks for different purposes.
2Reliability
If the pretreatment liquid to ink weight ratio is adjusted to achieve high washing fastness for main images, then image retention is improved, but the ability to erase additional images is reduced
Solution Approach 1:
The patent applies different pretreatment liquid-to-ink weight ratios to different regions or layers of the printed material. Main images use a lower ratio for high retention, while additional images use a higher ratio for easy erasure. This local differentiation allows both image retention and erasability to coexist in the same printed product.
Solution Approach 2:
The patent introduces dynamic control of the pretreatment liquid-to-ink ratio through the control section, which can adjust this parameter based on the specific printing requirements. This dynamic adjustment capability allows the system to optimize for either retention or erasability as needed, rather than being fixed at a single ratio.
3Reliability
If additional inks are used to achieve selective image erasure, then the washing fastness differentiation is achieved, but the loss of substance increases
Solution Approach 1:
Instead of using different inks, the patent changes the parameter of pretreatment liquid quantity relative to ink quantity. This parameter adjustment achieves washing fastness differentiation while using the same ink formulation, thereby reducing ink consumption and waste associated with managing multiple ink types.
Solution Approach 2:
The patent merges the functions of multiple inks into a single ink system by combining it with variable pretreatment liquid application. This consolidation eliminates the need for separate ink formulations for different washing fastness levels, reducing substance loss and simplifying the printing process.
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 the production of printed textile items with selectively erasable images without requiring additional inks, ensuring that main images remain intact while additional images fade upon washing.
Implementation Method 1
a pretreatment liquid that causes ink coagulation
Data Source
AI summary
The disclosure relates to a printing device including a pretreatment liquid jetting section which jets a pretreatment liquid that causes ink coagulation, an ink jetting section which jets an ink, and a control section which performs control such that the pretreatment liquid jetting section jets the pretreatment liquid onto a fabric, and the ink jetting section jets the ink onto the fabric onto which the pretreatment liquid has been jetted, thereby printing a main image and an additional image.