Sublimation Dyeing on Cloth via Controlled Pretreatment Drying
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Solution Overview
Problem
Existing methods for forming images on cloth using sublimation coloring materials face challenges in achieving uniform dyeing density and reducing dyeing unevenness, particularly when applying to natural fibers, due to difficulties in accurately controlling the drying process and the concentration of pretreatment liquids.
Innovation Solution
An image forming method involving the application of a pretreatment liquid containing an organic compound, followed by drying without direct contact with a heat source, and subsequent application of sublimation coloring material, where the pretreatment liquid includes an organic solvent with nitrogen or sulfur, ensuring uniform application and residual solvent levels to enhance dye penetration and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cloth is dried after applying pretreatment liquid, then the pretreatment liquid is suppressed from being carried in subsequent processes and productivity is improved, but concentration unevenness of the pretreatment liquid occurs and dyeing unevenness appears
Solution Approach 1:
The invention changes the physical parameters of drying by specifying temperature range (60-90°C), humidity range (40-70%), and drying time (1-10 minutes) to achieve uniform evaporation of pretreatment liquid without causing concentration unevenness, thus resolving the contradiction between productivity improvement through drying and maintaining dyeing uniformity
Solution Approach 2:
The invention introduces feedback control by monitoring and controlling drying conditions (temperature, humidity, time) to prevent over-drying or under-drying that would cause concentration unevenness, ensuring uniform pretreatment liquid distribution while maintaining productivity
2Device complexity
If natural fibers are dyed with sublimation coloring material directly, then the process is simple, but the dyeing density is low and dyeing unevenness occurs due to lack of fiber gaps
Solution Approach 1:
The invention applies preliminary action by treating natural fibers with pretreatment liquid containing swelling agents before dyeing to create fiber gaps, enabling subsequent uniform sublimation dyeing without complex multi-step processes, thus resolving the contradiction between process simplicity and dyeing uniformity
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
This approach improves dyeing density and reduces dyeing unevenness by ensuring uniform pretreatment and dye penetration, even on natural fibers, while minimizing environmental impact.
Implementation Method 1
a method of swelling fibers by using a pretreatment liquid containing a swelling agent
Implementation Method 2
drying the cloth after the pretreatment liquid is applied
Implementation Method 3
a technology of using a sublimation coloring material (sublimate dye)
Implementation Method 4
dye molecules diffuse into the inside of the fiber from voids of amorphous portions of the fiber
Data Source
AI summary
An image forming method for forming an image on a cloth with a sublimation coloring material, the image forming method including: pretreatment liquid applying that is applying a pretreatment liquid to the cloth; drying that is drying the cloth after the pretreatment liquid applying; and sublimation coloring material applying that is applying the sublimation coloring material to the cloth after the drying. The pretreatment liquid contains an organic compound, and a heat source and the cloth are not in contact with each other in the drying.