Preparation technology and development prospect of

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The preparation process and development prospect of foam printing paste continue

now the prescription of foam pigment printing paste is as follows:

after the above formula is made into foam solution, it is mixed with paint paste, and the prepared printing paste can be printed on fabrics (such as cotton fabrics) with garden printing machine, and the printed fabrics are heat treated at 150 ℃ for 3min after drying

alliea collinias recommends using thickener a1copintptf for pigment foam printing, which can produce extremely stable foam and can be used on garden printing machines

give an example of a typical printing paste formula:

the viscosity of this paste after mixing is about 5pa. S. from the mixing of printing paste and air twice the volume, a foam with a foaming ratio of 5:1 is produced, and the printing effect is particularly soft and clear (see the results in Table 1 above for the influence of foaming ratio on the printing effect of paint)

what should be paid attention to in the operation of foam printing process

(1) before printing, the printing equipment such as flower tube, garden and flat should be thoroughly cleaned to remove the antifoaming oil, so as to prevent unnecessary trouble in printing

(2) in lithographic printing, it is better to add a small amount of color paste continuously, so as to avoid surface drying during long-term operation, blocking the screen holes, and the scraper pressure is the same as or slightly higher than that of conventional printing

(3) in Yuanyin Gele, the color paste transmission pipeline should be smooth, and the pipeline should not be too long

(4) in roller printing, the pattern carving should not be too deep, the scraper should be very sharp, and the pulp roller should be short and hard

(5) stock slurry with the same foaming ratio can be used for dilution, but it should be evenly mixed before printing

(6) the unused foam color paste can be stored for 2-3 days. Before storage, the volume of foam should be marked so that the original volume can be restored after simple mixing before use. The storage container should be sealed and placed in a cool place to prevent damage to the foam system due to the increase of ambient temperature

(7) if the paint foam printing paste controls the same foaming ratio and increases the amount of adhesive, the viscosity of the printing paste will increase and the stability of foam will be improved. If the amount of thickener is increased, the stability of foam will also be improved. It is more effective than the use of stabilizer, but the amount should not be too much, otherwise it will affect the discharge rate of foam

(8) when printing continuously for a long time, if only one pulp barrel is used to supply foam color paste, the foam color paste must be stirred continuously and slowly

(9) prevent the paint foam color paste from contacting with acids, alkalis, alcohol and other chemicals, so as not to damage the foam system

(10) foam printing has the advantages of softer hand feeling and higher surface color giving than conventional printing, but the biggest research topic in the industry is how to ensure that the density of foam does not change throughout the printing operation, otherwise the printing color will be different due to the inconsistency of density

(11) the size of foam should be controlled uniformly, otherwise it will bring bad printing effect. Do not let the foam ratio rise during the printing process, otherwise it will cause adverse consequences such as light color or knife dragging

what is the development prospect of foam printing

the early success of foam printing dyeing and finishing technology is the printing and chemical dyeing method of sancowad in Switzerland. Subsequently, countries competed to study the foam dyeing and finishing and printing technology. More than 30 professional manufacturers abroad have developed foam dyeing and finishing equipment for your service company. The more famous ones are the FFT system of Gaston County in the United States, the single-sided and double-sided foam dyeing and finishing machines of kusters in Germany, the Garden foam printing machines of Stoke and stockbrabant in the Netherlands Zimer magnetic stick foam printing system in Austria, etc. SP and SP2 double-sided foaming machines and yj-200-800 foaming machines have also been developed in China. On the basis of the successful development of foam finishing in China, active research and development work is also being carried out on foam printing. For example, Donghua University (the former China Textile University) cooperates with Wuxi printing and dyeing factory and Changzhou No. 4 printing and dyeing factory to use direct, reactive, disperse and other dyes and coatings, and adopts direct printing technology to successfully produce foam printing on manual platens, flat, garden and roller printing machines, printing a large number of fabrics. The experience summed up from a large number of experimental production: it is also necessary to improve the stability of foam and printing clarity, and we should study and develop simple and easy multi-functional foam dispenser and foam applicator, so as to facilitate the promotion and application. Producing foam with certain characteristics is the key to foam printing technology. Some factories use an ordinary mixer to rub 2000 weights against the back cover of the hardness tester for R/min and stir for 8min to obtain good foaming effect. Among them, there are two successful ways: one is to use the existing conventional equipment, slightly improve it, and add special foaming equipment, which is not expensive and easy to be accepted; the other is the selection of strong foaming agent, which can achieve foam application parameters only by regulating the flow, which is easy to control, more accurate, and has good adaptability and attention. Due to the low liquid absorption rate of foam printing, Keshi can omit the infrared pre drying device, auxiliary modification additives, and speed up the car speed (Wen/Liu Yongqing)

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