Rotary stencilization

In this article, we will provide you with the necessary information about rotary stenciling; Please stay with us until the end of the article. We will do our best to make the article we intend to write attractive to our dear audience, so you will accompany us until the end. As you know, the fabrics that have turned into clothes and we wear them have traveled a ups and downs path to become the shape we see and We use them. Fabrics are woven during different operations and are produced with different types of printing methods in different designs and colors, one of these printing methods is rotary printing

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Familiarity with rotary printing

Rotary printing, which is known as one of the best methods of printing high quality fabric, is done with the help of a roller and various stencils on it. The colors and designs printed with this method are very durable because the color penetrates the deepest layers of the fabric and remains there. The speed of rotary printing is very high despite the moving tape and stencils، This is the reason why this printing method is used more compared to other methods and can be used on all kinds of fabrics. In rotary printing, two horizontal and cylindrical printing machines are used, whose functions are similar to each other and have differences only in appearance. In the horizontal device, the stencils are placed flat on a surface and the fabric passes under the stencils horizontally and the desired design is printed on them. In the cylinder machine, a large cylinder is placed at the end of the printing machine that rotates the conveyor belt by electric current، This rotation turns the blanks so that the desired design of the stencils is executed on the fabric and then it is sent to the dryer.

How stencils are placed in a rotary printing machine

The stencils are placed next to the printing platform, but the order of their placement is different based on the colors to be used. For example, the colors that cover the lower surface are at the beginning of the platform, but the colors that are used the most are after it؛ Of course, dark and light color can also change the place of stencils; If two colors occupy the same surface, the lighter color should be placed in front of the darker color. Colors come from the paint station with the help of a pump with a tube، They enter another tube and then exit the pores in one hand and the edge of the paint blade enters the stencil pores.

All about rotary stenciling

Rotary stenciling may not be a familiar topic for you, but don’t worry because in this article you are going to get to know rotary stenciling in the simplest possible way. Stencils have thousands of different designs that can be used to print different designs، But rotary stencils, which are used exclusively for printing designs on fabric, are made of nickel so that they can resist all kinds of chemical and mechanical materials. Rotary stencilization is cylindrical in shape that has no pores and is made of nickel by electrogalvanic method and has high strength against chemical and mechanical materials. Rotary stenciling is done in three ways: Rotary lacquer stenciling, Rotary Gallov Stenciling, Selzi Rotary Gravure stenciling in Rotary lacquer stenciling method، Stencils are designed in such a way that they have uniform pores. The specifications of these stencils are as follows: The width of the stencils should be determined based on the width of the machine and always try to increase their width beyond the width of the fabric that is sent for printing. The circumference of the stencils also determines the maximum length of the re-peat and should be between 640 and 10180 mm. Mesh score: This score determines the number of pores in an inch across. Pore form: In rotary stenciling, the shape of the pore must be determined in two ways, standard and penta, based on the type of stencil.

Preparation of rotary stencil

In order to print the design on the stencil on the fabric, measures should be taken, which we will say in order below. The first step is to open and separate the desired stencil from among the stencils that are placed inside each other؛ Note that the stencils are very sensitive and vulnerable and you should remove them carefully and take care of their sharp edge. Now you need to place the stencil you have pulled out on the base and secure the special rims on both sides so that they are not moved by the clamp when moving. Rounding is the second stage of rotary stenciling، At this stage, the clamps that are placed on both sides of the stencil make the stencil cylindrical and to stabilize this cylindrical state، They are dried at a temperature of 160 degrees Celsius. Degreasing is also one of the most important steps in the preparation of stencils; At this stage, they use a degreasing agent such as SCR35 D greaser for 10 minutes. The thing to note at this stage is to protect the stencil from impact and damage. Also, be careful that the degreasing does not come into contact with your skin because it is dangerous for human health, it is recommended to protect yourself by wearing gloves and glasses while performing these steps. Degreasing from stencils can be done in another way; In this method, stencils are placed on the roller and with a sponge soaked in degreasing material، They degrease and then rinse with cold water to remove and neutralize the acid that may be left on it from a solution that contains 20% soda They get help and rub it well with a sponge soaked in it and wash it again with water and dry it.

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In the next step, the surface of the stencils is impregnated with light-sensitive varnish; This varnish is a synthetic resin in the form of emulsion and a sensitizer such as dichromate salt solution. Stencil coating with light-sensitive varnish is done both manually and by machine. The fifth stage of rotary stenciling is drying the stencils that are covered with light-sensitive varnish in the previous stage؛ The temperature required to dry them is between 100 and 120 degrees Celsius. At this stage, you should pay attention to some points so that the stencils are not damaged; When drying، Stencils should not stick together and should not be exposed to moisture and heat before they dry well. – The next stage of rotary stenciling is lighting, and in this stage of rotary stenciling, dried stencils are placed on a machine made of a roller to light It is formed with a plastic layer; When the stencils are placed on the roller, compressed air is blown from inside the rubber layer؛ Due to the pressure of the blown air, the rollers should be kept firmly on the roller. Now it’s time to mark the central lines, printing width, cutting width and center of the design with the help of the metal pen of the lighting machine. When lighting the center of the design on the film, they must be completely on top of each other with the center of the design and there is no deviation. Exposure may be done in one step or several steps. The next step is rotary stenciling؛ Emergence is done with a thick cloud and water or an emergence machine, and at this stage, the parts that are created by the film design that the light has not reached, and as a result, hard and They are insoluble, washed. The emerging car has a water shower، There are hair rollers and two support rollers, with the help of which the stencil is cleaned from the inside and the pores that have not been exposed are opened and the dough fabric passes through these pores during the printing stage and they reach the surface of the fabric. The stencils are controlled again with the help of light so that if a hole is not yet opened, it will be opened with the help of water and needles. Finally, the stencil should be dried well. The final stage of rotary stenciling is baking or hardening; At this stage, baking is done on the varnish on the stencil to increase their resistance؛ Of course, it is also possible to harden the varnish with chemicals. Hardening makes the bond between the varnish molecules stronger.

In this article, we tried to provide you with all the necessary information about rotary stenciling, we hope it was useful for you to read it. In the end, we need to introduce you to one of the best collections in the field of fabric printing؛ Aram Completion Company under the brand name Unitex, using an experienced staff and using very advanced European dyeing and finishing machines and devices in the field of textiles and textile services They are world famous, this company specializes in processes such as weaving, dyeing and finishing a wide range of textiles, including tari podi and knitting؛ Aram Completion has always been a leader in quality and satisfying customers with various products at very reasonable prices and various innovations. The philosophy of the birth of this company is based on the complete elimination of waste. Aram Completion Complex has always put environmental protection on its agenda, and for this purpose, by building water supply pools and treating outgoing effluent with an area of approximately 700 square meters The installation of modern wastewater treatment equipment has done environmental protection and protection in turn, which is unique in its kind.