Discussion on the practice of three-dimensional printing process
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With the improvement of living standards, people have changed the concept of wearing fabrics, not only paying attention to the style of clothing, but also emphasizing the combination of texture, feel, and perception of fabrics with clothing styles. Comfort, aesthetics, cold and warmth also put forward higher requirements, the emergence of cashmere printing, foaming products, to add new and unique textiles to meet the consumer demand.
1 Fleece foam three-dimensional printing principle
1.1 Flocking and foaming
The fluffy foam three-dimensional printing is a printing method which is a traditional flat new pattern on a flat fabric and has a three-dimensional effect. The pile printing is like a velvet embroidery, and the three-dimensional foam printing pattern makes the fabric appear bright and convex, bright and bright, and gorgeous in appearance. Printing methods and equipment and processes are similar to general paint printing. However, in the heat treatment, the pattern rapidly rises and swells, and the three-dimensional shape formed is different.
1.2 Fleece printing paste composition
The composition of the printing paste for the pile printing is as follows.
Microcapsule preparation 40g ~ 60g ~
Adhesive/10g～15g
Adhesive / 0g ~ 5g
Urea/5g～10g
Thickener / appropriate amount / 100g
1.3 Fleece foam printing pattern and color design
The fleece foam printing is thick in texture, so in the design of the pattern, the pattern with large blockiness and strong contrast of colors should be used to enhance the visual impact. The animal prints such as dragon, phoenix and gold grain in folk embroidery can be selected, and traditional echoes, moiré, curly lines and other embellishments can be used to form a rich and auspicious decorative effect. The design of the pattern adopts the method of imitation embroidery, such as "picking flowers", "cross stitch", "flat embroidery". Innumerable shapes and different patterns make up the layered sensation of the warp and weft parallel lines, vertical lines and 45 slant lines of the pile fabric, making the pattern appear natural and random. The color design of the pattern can have the tendency of color glaze, each set of patterns has a distinct color tone, or a red tone, or a blue tone, or a green tone, so that the color of the pattern is clear, strong, coordinated, and has a main Times, the arrangement is decent.
2 Foam color paste additive selection and its effect on stability
The foam printing paste is composed of a full aqueous binder, a foaming agent, a stabilizer, etc., and a mechanical solution is used to uniformly mix a certain proportion of air to form a plurality of small uniform uniform bubble micromers, which is a relative A stable dispersion that is printed onto the fabric under mechanical external forces. Due to the capillary action of the fibers and the wetting ability of the foam, the foam is broken and the initial viscosity of the paste is restored, which in turn achieves the desired uniform printing effect.
2.1 Selection of additives
The foam size, strength and stability in foam printing are mainly related to the foaming agent and stabilizer. It must therefore be chosen to have good compatibility with a view to the relative stability of the foam. Many surfactants can be used as blowing agents. Commonly used are sodium dodecylbenzenesulfonate and sodium lauryl sulfate, and stabilizers include hydroxyethyl cellulose, sodium alginate, dodecyl alcohol, and stearic acid amine. We think that the foaming agent is sodium lauryl sulfate, and the stabilizing agent is preferably stearic acid amine.
2.1.1 The amount of foaming agent
The main function of the blowing agent is to reduce the surface tension of the water. The amount of blowing agent directly affects the foaming effect and the stability of the foam. If the amount is small, the surface tension of water can not be sufficiently reduced, and a foam of uneven size will be produced, and the stability of the foam is also poor; if the amount is large, excessive foam will be formed, and the amount of liquid in the foam itself will be reduced and reduced. The wetting ability of the foam makes the foam printed on the fabric rupture and can not quickly diffuse and diffuse inside the fiber, resulting in poor surface finish of the fabric. Through a large number of tests, it is considered that the amount of the blowing agent is between 1% and 1.2%.
2.1.2 Stabilizer dosage
Stabilizers are mainly used to increase the half life of the foam and extend the life of the foam. The general dosage is controlled between 0.8% and 1%. Too little to achieve the purpose of stability, too much foam is poorly wet, not easy to break. 2.2 The effect of initial viscosity, pH and temperature on foam stability
2.2.1 Initial viscosity
Foam pastes have a certain viscosity to ensure the normal working pressure of the foam and increase the thickness of the foam wall. According to the test results, it is considered that the viscosity should be controlled at 35 Pa·s to 37 Pa·s under certain conditions, and measured by a rotary viscometer under the condition of 3 # rotor 30 r/min. The viscosity is too low, the foaming effect is poor, the foam is not uniform; the viscosity is too high, and the printed fabric feels hard.
2.2.2 pH value
The foam printed thickener uses PTF in an amount that determines the initial viscosity of the colored paste. The pH value is low, and the PTF is not fully expanded, so that the rheology of the foam slurry is poor, and the pH value is too high, so that the amount of PTF is increased, and the fabric feels hard. The optimum puffing state of PTF is a pH of 9-10.
2.2.3 Temperature
Temperature has a greater impact on the stability of the foam. Since the foam is formed by two phases of liquid and gas, the energy itself is unbalanced, and the temperature increase will aggravate the thermal motion of the molecules, thereby causing the foam to rupture. Therefore, a cooling tube is attached to the foam generator so that the generated foam is always kept at the same temperature.
3 Conclusion
Fleece foam printing is a new process, and the pattern printed by this process has a three-dimensional sense of flocking, embroidering and applique. The selection and dosage of color paste and auxiliary agent in the process of cashmere foaming printing and the initial viscosity, pH value, temperature and pressure during processing have certain influence on the quality of the cashmere foamed printing products, and reasonable selection of additives Strictly control the amount of foaming agent and stabilizer to improve the quality of the cashmere foam printing products.