Textile Technology: Common Technology Of Screen Printing Technology

< p > 1, water slurry < a href= "http://www.91se91.com/news/" > printing process < /a > /p >

< p > water paste printing process is one of the most basic printing processes in screen printing industry. It can be printed on almost all shallow base fabrics such as cotton, polyester, hemp and so on, and is widely used.

Its working principle is similar to that of dyeing. The difference is that it is dyed into a certain area of the fabric to become the color needed for flower position.

Therefore, this technology can not be applied to deep base fabric.

The biggest advantage of the water paste printing process is wide application, good fastness to flower position, and better printing results at relatively low price.

The limitation of the water slurry printing process is that it can not be applied to all dark fabrics.

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< p > two, paste printing process < /p >

< p > gel printing process uses special chemical gels and dyes are highly seamless.

The dye is firmly adhered to the fabric through the medium of the gel, and the paste printing process overcomes the limitations of the water paste printing.

It is suitable for printing all kinds of color and material. It can be printed on cotton, linen, viscose, polyester, nylon, polypropylene, polyvinyl chloride and all kinds of fiber blended fabrics. It can also be printed on leather, artificial leather and other materials. It can be used for fluorescent printing, ink jet printing, burnt out printing, electrostatic flocking printing and other printing processes.

The biggest advantage of the pulp printing process is wide application, beautiful color and high reduction, but its printing process is complicated and relatively expensive.

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< p > the emergence and wide application of the mucilage after water slurry, because of its very good coverage, can make any dark color on the dark clothes, and has a certain degree of gloss and three-dimensional feeling, so that the garment looks more upscale, so it can be popularized quickly, and it will be used on almost every printed T-shirt.

But because it has a certain hardness, it is not suitable for large area of the field design, large area pattern is best to use water slurry to print, and then embellish some mucilage, so that it can solve the problem of large area of glue, and also can highlight the sense of hierarchy of the pattern. Another way is to steal large area of the field pattern, making a rotten effect, but always wear a bit hard, so it is best to combine water and glue to solve the problem of large area printing.

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< p > three, foaming printing process < /p >

< p > foaming printing is also called stereoscopic printing. The foaming printing process is developed on the basis of the glue printing process. Its principle is to add a certain proportion of high expansion coefficient chemical substances in the dye printing dye. After printing, the printing position is bubbling with a high temperature of 200-300 degrees after drying, achieving a three-dimensional effect similar to "relief".

The biggest advantage of the foaming printing process is the strong sense of the stereo, the outstanding printing surface and the expansion.

Widely used in cotton, nylon cloth and other materials.

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< p > foaming printing paste has developed into two major series: physical foaming and chemical foaming. Physical foaming slurry is mainly prepared with microcapsules. Low boiling organic solvents are stored in microcapsules. When the temperature rises, organic solvents in the microcapsules rapidly vaporize, the microcapsules bulge, and the expanded microcapsules squeeze each other, resulting in irregular overlapping distribution, so the surface is uneven, so it is also known as "fleece printing".

There are two types of chemical foamed pulp: one is the color paste made of thermoplastic resin and foaming agent, the other is the color paste composed of polyurethane and solvent thickener.

However, the solvent in the printing paste of the latter fabric should be recycled, which will bring difficulty to the printing plant.

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< p > four, < a href= "http://www.91se91.com" > flocking printing process < /a > /p >

< p > electrostatic flocking printing process is one of the three dimensional printing processes.

The principle is to pfer the high-strength compound resin brightener to the substrate with the screen that contains the desired position, and then let the fiber down through the high voltage electrostatic field of hundreds of thousands of volts.

The floss is vertically and evenly "hit" to the adhesive, and a layer of villi is paved on the surface of the fabric, and then solidified by high temperature.

It is widely used in sofa fabrics, packaging boxes, shoes fabrics, decoration and decoration, toys, industrial electrical appliances protection and so on.

The fuzz is coated on the surface of the object, and is not limited by the shape and size of the plant. The products produced by the flocking process are strong in three-dimensional sense, bright in color, soft in touch, and free from velvet wear.

Cotton cloth, silk hemp, leather, nylon cloth, all kinds of PVC, denim, rubber, sponge, metal, foam, plastic, resin and no cloth can be printed.

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< p > the adhesive used in flocking plays an important role in the printing and dyeing processing industry.

Commonly used adhesives are divided into diplomatic binder and self crosslinking adhesive.

The foreign binder has its group containing carboxyl group (-C00H) or amide group (-C-NH2) and amino (-NH3) and so on.

When the film is formed, it can react with the external adhesive to form a reticulated membrane, thus fixing the villi on the base cloth.

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< p > selection of adhesives should pay attention to the following points: 1, the bonding force of gray cloth and fuzz; 2, after flocking, soft feel, the surface film is appropriate, so as to facilitate flocking; 3, moderate viscosity, in order to facilitate spraying, coating and scraping on the grey cloth; 4, chemical stability is good, good weather resistance and washing resistance; 5, easy to operate, add a small amount of viscosity adjustment agent when used to adjust viscosity; 6, non-toxic, harmless, not easy to burn.

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< p > five, photosensitive printing < /p >.

< p > photosensitive printing is also called photosensitive color printing. The early photochromic printing is made of light changing dyes. The structure of the dyes changes when exposed to ultraviolet radiation and presents different colors.

For example, the dye A is colorless, and after ultraviolet irradiation, the molecule turns into a cyanine dye B, which is blue. When dye B is exposed to visible light, it will be pformed into a colorless dye A.

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< p > now microencapsulated technology is applied to encapsulate the light changing dye in the capsule. The particle size is generally 1-10 microns. The light fastness of the coated dyes is greatly improved.

At present, the light changing dyes have developed to 4 basic colors: purple, blue, yellow and red. The 4 kinds of light changing dyes are all closed rings. They are printed on fabric without color, but can be purple, blue, yellow and red under ultraviolet light.

The so-called photosensitive color change from one color to another is in the printing paste, the light change dye and general color coating after mixing - printing.

For example, the color change of dye red and pigment blue is mixed and printed, showing blue on the fabric surface, and then blue violet when exposed to ultraviolet light.

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< p > six, thermal discoloration printing < /p >

< p > thermal discoloration printing, also known as thermochromic printing, has been used in the early stage of thermal dyed printing. It has been processed into a microcapsule after heat sensitive dyestuff. It is printed on the fabric. It has two types: reversible and irreversible.

Irreversible thermochromic dyes are generally used as temperature detection instructions.

It is generally reversible for textiles.

According to its structure, it can be divided into two categories: inorganic and organic. Organic heat sensitive dyes are widely used in textiles. They are made up of three colors, namely, latent dyes, chromogenic agents and sensitizers (Jian Minji).

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< p > hidden dyes are substances that combine protons to develop colors, such as lipids, amines and other compounds, which are used as electron donors in the discoloration system.

Chromogenic reagent is an acid releasing compound that releases protons, such as phenols, carboxylic acids, halogenated alcohols, etc.

The discoloring system of latent dyes and chromogenic agents can achieve the effect of discoloration in a special solvent. The molten body of the solvent has good solubility for dyes and chromogenic agents, and can enhance the sensitivity of the system to heat, so it is called sensitizer (Jian Minji).

The sensitizer is generally meltable higher fatty alcohol, fatty acid and its ester, aromatic hydrocarbon and its ether and ester compounds, and directly determines the color changing temperature.

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< p > at present, thermochromic dyes have developed to 15 basic colors, and all colors can be mixed together. Chromatography is complete and can be mixed with color paints. Therefore, heat sensitive dyestuffs can be changed from coloring to colorless, and can be changed from one color to another. The temperature retention time of color changing is also more and more sensitive. From the original color change temperature to 10 degrees Celsius, the temperature of color change is less than 5 degrees.

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< p > seven, water change printing process < /p >

< p > water change printing process is one of the latest printing processes.

A variety of physical and photochemical principles are used to produce products using this process.

When the fabric enters the water, the raw material and the water of the fabric undergo pient complex changes, showing a pre-set rich pattern. When the water on the surface of the fabric is evaporated, the original pattern appears.

This technology can be widely used in the printing design of beach pants, swimsuits, raincoats, umbrellas, large signs, advertisements and other media.

"Magic discolouration umbrellas" and a series of changeable, amazing color changing products.

It has a vast market.

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< p > eight, fluorescent printing process < /p >

< p > fluorescent printing is a new type of special printing technology. The principle is to use special technology to fuse the light storing self luminous material into the fabric and achieve the function of automatic luminescence by absorbing all kinds of visible light. Its characteristic is that it can be used indefinitely.

The product does not contain any radioactive elements. It can be used for various purposes. It is evenly distributed in various pparent media, plastics, ceramics, glass, etc., to realize the self luminous function of the medium, and can show the bright colors of the pigment, showing good low level emergency lighting, indicating the recognition and decoration and beautification effect.

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< p > from the technical point of view, there are: printing technology of fluorescent paint, common direct printing of fluorescent paint and common coatings, direct printing of fluorescent paint and reactive dyes, reactive dye discharge discharge printing, and phthalocyanine resist printing.

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< p > the factors affecting the fluorescence of fluorescent fluorescent paint are: (1) the whiteness of printed fabric: the more white the fabric is, the more bright the cloth is, the better the reflection of light, and the better the fluorescence. The fluorescence on the white cloth is better than that of the color cloth, and the fluorescence is better on the silk bleached poplin.

In the molecular structure of the binder component, the vibration of the electron is compatible with the electronic vibration in the molecular structure of the fluorescent coating, and the fluorescence is good. Third, the amount of fluorescent paint is increased: the increase in the amount of fluorescein is conducive to the improvement of fluorescence. However, when the amount of fluorescent paint reaches 30%, the fluorescence reaches saturation.

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All kinds of luminescent products made by P printing technology are absolutely safe for consumer goods, such as clothing, shoes and hats, stationery, watches, switches, signs, fishing gear, handicrafts and sporting goods.

It also plays a good role in building decoration, pportation tools, military facilities, fire emergency systems such as import and export signs, escape and lifesaving lines.

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