Thermal transfer printing on hats
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Thousands of thermal transfer equipments can be sold every year in the world. It also shows from one aspect: The traditional thermal transfer method is still used by many companies.
For a screen printing company, the process of understanding how to use a screen for thermal transfer to print logos on caps is very simple. Instead of printing on fabrics, it first prints a flipped image on paper and then dry it. The image is cured in the device and the hat is finally transferred to the cap using a hat thermal transfer device, usually in front of the cap.
The pattern printed on the hat by the thermal transfer method is very clear, there is no problem in the surface printing, and it is not necessary to determine the angle of the squeegee and some other parameters related to the screen printing.
If you happen to be engaged in screen printing business or advertising decoration business, using the thermal transfer method is undoubtedly the simplest method in hat decoration printing.
To complete the task of thermal transfer, you also need some special equipment. In addition, if you often receive long-run printing business, the use of thermal transfer method is also more appropriate. For example, if you need to print a large number of uniforms, then when using a thermal transfer method when printing consecutive numbers, you do not always need to reset the printer; for example, a restaurant will order new employees every few weeks. Hats or work clothes that are printed by thermal transfer can save a lot of time and money.
First, let us begin to understand the heat transfer method. First of all, there is a heat transfer machine for hats. There are many brands of this type of printing machine, you can go to the site to find, click on the site's "Supplier Directory" section to see the corresponding content.
If you are a newcomer who has just entered the field of hat decoration, it is advisable to attend some of the industry's exhibitions in person and meet equipment suppliers, hat processors, and thermal transfer equipment suppliers, and consult them. Manufacturers will fully show you equipment. Operational performance.
Second, experienced printers can start here. In general, most of the equipment required for hot melt transfer work can be found in screen printing plants, such as screen-exposure devices and infrared/gas dryers. At this time, it is only necessary to purchase a monochrome screen printer with a vacuum adsorption frame and a vacuum pump.
In addition, the following materials need to be prepared: transfer paper, standard thermal plasticizing adhesive or "hot peel" pad printing ink (the latter is recommended), and adhesive powder for "cold peeling" transfer.
Third, the main difference between direct printing and indirect transfer of originals, screens, and plates is that the images transferred during indirect transfer are reversed.
Combine multiple original images on a single sheet of paper. For example, you can combine 6-8 images on each sheet of paper (you can increase or decrease the number of images appropriately depending on the size of the whole sheet). The purpose is to transfer the originals one at a time. Multiple images. Most of the decorative patterns printed on the hat are typically 3 x 5 inches in size.
Next, select the appropriate number of mesh screens for the substrate material used. If the hat is dark, a mesh with a lower number of meshes should be selected, such as a 60 to 110 mesh polyester mesh; if the hat is light, mesh should be selected between 195-230 mesh. network.
After exposure and rinsing, the screen is placed on a monochrome printer with only one printing station. To transfer the transfer paper in place, vacuum is the best method, but if you do not have a vacuum, In the printing process, the transfer paper can also be fixed to the printing position by spraying a small amount of adhesive.
Fourth, the choice of transfer paper and ink Most silk screen material stores sell transfer paper, thermal plastic melt transfer type thermal transfer used in the main two types of transfer paper, commonly known as coated transfer paper And non-coated transfer paper.
The coated transfer paper surface has a smooth coating suitable for "cold-peel" transfer with standard plastisols. Non-coated transfer paper is suitable for "hot-split" transfer with specially formulated special inks.
Should it be used "cold peeling" or "hot peeling"? It depends on the feeling and surface effect that your prints ultimately want to achieve. If the customer wants a certain degree of gloss on the surface of the print, they can use “cold peel†transfer; if the customer wants a matte effect, The prints (which look like the effect of direct printing) should use "hot peel" transfer paper. In actual production, the application of "hot-stripping" transfer method is more common.
When selecting hot melt inks for printing transfer paper, you can use a standard plastisol for "cold peel" transfer and then transfer the pattern on the transfer paper to the cap. In general, the standard plastisol has a strong hiding power, and the printing opacity is very high even on a dark background, but the glossiness of the printed matter is relatively high, giving a glittering feeling.
In practical applications, the most commonly used is thermal peeling transfer ink, this type of plastisol is specially formulated, that is, in addition to a small part of the ink remains on the paper during the thermal transfer process In addition, most of the ink has been transferred to the hat. This peeling method left a rough, dull printed image on the surface of the hat, a bit like the effect of direct screen printing. Furthermore, it is necessary to use an ink specially formulated for this hot-stripping transfer method, and most ink manufacturers produce and sell the transfer ink.
Thermal transfer has been around for quite some time now, and it is still a flexible method for decorating hats. In addition to the thermal transfer method, there are other hat decoration methods. For example, the digital transfer method uses an ink jet printer and a laser printer to print a decorative pattern on a hat.
Hats are very popular nowadays. Everyone should seize the opportunity to add hat thermal transfer services to the company's business. Do not miss the opportunity.
Fifth, the basic steps of screen printing thermal transfer in the vacuum frame set up a three-point positioning registration system, this way, in the multi-color transfer, you can accurately put the back of the transfer paper to the vacuum rack On the corresponding location.
The first color is printed and the paper is passed through an infrared drying device or a gas drying channel. The drying temperature is controlled between 190 and 230 degrees, and the drying time is controlled between 30 and 45 seconds. Follow the manufacturer's recommended procedure. Note: All we need is to allow the plastisol to solidify, but do not allow the ink to dry completely in the dryer. Otherwise, what will be obtained on the paper will be the image directly after printing, and it will still flip!
If you only want to transfer monochromatic images, this will be the end. However, if it is a multi-color transfer, the transfer paper at the end of the drying apparatus must be collected and returned to the printer again. Next, the previous steps are repeated to print the remaining other colors respectively.
A second screen printing plate is loaded on a monochrome printer. The printed transfer paper is registered and fixed with the three-point register mark, and the second screen plate is registered with the first color, and the previous operation steps are repeated. After each color printing, it must be dried by a drier. After the hot melt ink on the transfer paper is solidified, the next color printing is performed.
When a "cold peel" transfer paper is made, a powdered adhesive may be used in the wet plastisol. Before the ink on the transfer paper in the drying device solidifies, the printed transfer paper is placed in the box containing the powdered adhesive. Lid on the line, powder can improve the adhesive properties of the transfer paper.
Sixth, the application of thermal transfer In hat heat transfer machine, the size of the lower bracket to be correct, this is very important. With the passage of time and the development of the times, hats are constantly being introduced. At present, the sizes of caps are getting smaller and smaller. For example, old-fashioned hats with foam fronts have a cap height of 3.5 to 4 inches. Hexagonal caps and pentagonal golf hats are currently popular, and their crowns are 3 inches high.
Due to the different hat styles, the height of the caps are different. Therefore, in order to adapt to the printing requirements of hats of different styles and different heights, most hat transfer machines have replaceable lower brackets. It is recommended to prepare two or three different ones. The size of the lower bracket is optional.
Put the hat on the lower bracket of the hat heat transfer machine and remove the sweatband in the hat. This is mainly to provide a flat transfer surface.
Most hat heat transfer machines have a spring device on the bottom of the machine that pulls the hat down together with its support. Note: When printing a hex hat, increasing the pressure of the spring will make the seam in the front of the hat slightly open. The ink is evenly transferred and covered to the mid seam of the cap; when the tension of the spring is released, the mid seam of the cap is closed, and the ink evenly covers the mid seam gap on the cap.
The temperature on the cap transfer machine is set according to the ink manufacturer's instructions and recommendations. If cold stripping ink is used, the temperature is generally set to 350 degrees. If hot stripping ink is used, the temperature is generally set to 375 degrees.
Place the transfer paper on the front end of the cap with the printing face down and facing the cap, set a suitable press time on the timer, and press the transfer paper down with a hot plate, if cold Peel the transfer method, generally set the time between 10-15 seconds; if it is hot-peel type transfer method, set the time between 8-12 seconds; of course, can also transfer paper Manufacturers consult related matters.
If a hot-peel transfer method is used, the transfer paper should be peeled off immediately after the transfer process is finished; however, if a cold-peel transfer method is used, after the heat transfer, it should be cooled before the transfer paper is peeled off (this It is also the origin of the name "cold stripping".