Heat transfer factors
Thermal transfer printing and bronzing are two processes with completely different literal meanings but are actually difficult to distinguish. The domestic definition alone is very complicated. According to the general definition, the machine that uses hot stamping film is called hot stamping machine, and the machine that uses heat transfer film is called heat transfer machine. Thermal transfer film is an intermediary film with rich graphics and text printed by gravure printing machine, screen printing machine or inkjet printer. It is pressed on the surface of the product by rubber rollers on the thermal transfer printing machine to complete the transfer.
The printing elements of thermal transfer printing include fixture, thermal transfer film, silicone roller or silicone plate. Since the patterns on the heat transfer film are often independent patterns one by one, the heat transfer machine often needs an electric eye tracking system. Therefore, some people in the industry call the hot pressing equipment installed with the electric eye tracking system a heat transfer machine, while the hot pressing equipment without an electric eye tracking system is called a bronzing machine.
Obviously, it is difficult to distinguish between heat transfer printing machine and bronzing machine. Maybe we can easily distinguish between hot stamping process and heat transfer printing process.
What you need to consider in the heat transfer printing elements is to make a suitable fixture, choose a heat transfer film that meets the customer's needs, and then install the silicone roller. Sometimes, the silicone roller needs to be ground into a special shape to complete the transfer well. print.
Generally, a heat transfer machine that uses a silicone rubber roller as a heat transfer head is called a heat transfer machine. The silicone rubber roller obtains heat by radiant heating. When it contacts the product, it makes line contact and generates rotation pressure. The rubber roller is a heat transfer machine that can be used for the transfer of flat products, cylindrical products, or ellipsoidal products.
Structure of rubber roller heat transfer machine
Rubber roller assembly
• Rubber roller: It is made of high-temperature resistant silicone rubber and can be selected from different sizes and hardnesses. Generally, for rough product surfaces, a softer silicone rubber roller can be selected, and for smooth surface interfaces, a harder silicone rubber roller can be selected. Silicone rubber rollers are generally cut into sizes slightly wider than the pattern width.
• Rubber roller rotation: The rubber roller has two actions, one is lifting and the other is rotation. Lifting is controlled by a cylinder or hydraulic pressure, and rotation is driven by a motor to drive the chain to provide power. The rubber roller contacts the product and requires uniform rotation. The pressure adjustment between the rubber roller and the product is generally achieved by adjusting the height of the rubber roller with a hand wheel.
Heating system
• The rubber roller can only be heated by radiation, that is, the heat generated by the heating tube is irradiated to the surface of the rubber roller, causing the temperature to rise. This is different from the internal heating of the hot stamping head. Therefore, the temperature of the rubber roller is not as high as that of the hot stamping plate. For products that are difficult to transfer, it is necessary to increase the pressure to make up for the temperature deficiency. The temperature control is the same as that of the hot stamping machine. The actual temperature is measured by thermocouples and fed back to the circuit control system to decide whether to turn off or on the heating tube to adjust the temperature. Therefore, the temperature is not particularly precise.
Transmission system
Automated thermal transfer machines are becoming more and more popular. They have two basic structures: a flat turntable and a vertical turntable. Different loading and unloading methods need to be designed according to the appearance characteristics of the product.
The structure of the automated thermal transfer machine and the automated hot stamping machine is basically the same. The main difference is the shape of the hot stamping head and the photoelectric tracking system of the thermal transfer film. The electroplated aluminum used in the automatic hot stamping machine does not have pattern pitch control, so there is no positioning, but the thermal transfer film is a pattern printed continuously on the entire roll of plastic film. Only by controlling the starting position can it be transferred to the appropriate position of the product.
Taper objects Thermal transfer
For the decoration of cups, it has always been the battleground for special printing processes. Due to the rich colors and expressive power of heat transfer printing, heat transfer printing technology plays an important role in the decoration of cups. For a cylindrical cup, its unfolded surface is a cuboid, which can be done well with an ordinary surface heat transfer machine, but for a cup with a considerable amount of taper, due to its large end and small end After the surface is unfolded, it presents a fan shape, so the transfer of the thermal transfer film will be unbalanced. The large end needs to turn over a longer arc length, and the small end needs to turn over a shorter arc length. In order to accurately transfer the thermal transfer film to the cup in proportion, a heat transfer machine specially used for tapered cups has been developed, which will be installed on the fan-shaped track mechanism according to the thermal transfer film. During the process, the thermal transfer film is rotated at different angles according to the arc lengths of the big end and the small end of the fan, and the pattern of the tapered cup is transferred very accurately.
Theoretically speaking, the cups have a certain taper. If you want to transfer accurately, you must use a taper transfer machine, but if the taper is not too large, you can also use an ordinary thermal transfer machine, but we have to accept the small The graphics and text are deformed.
The heat transfer machine for tapered cups is the same as the ordinary heat transfer machine. It needs to make a jig, and it needs the perfect cooperation of three elements: the heat transfer film and the silicone roller.
(with workbench blowing function) is a device specially used for heat transfer decoration on the flat part of the lubricating oil barrel. The following is a related introduction:
Equipment structure and principle
• Workbench: Usually has good flatness and stability, can place the lubricating oil barrel steadily, and ensure that the barrel body remains stable during transfer. Its blowing function is a highlight. By setting up a blowing device on the workbench, air flow can be blown out before transfer, effectively removing dust, debris and other impurities on the flat surface of the lubricating oil barrel, creating a clean surface environment for heat transfer, and helping to improve the adhesion and clarity of the transfer pattern.
• Heating system: Contains heating plates or heating elements, evenly distributed at the position corresponding to the flat surface of the barrel body, can quickly heat up to the appropriate heat transfer temperature, and promote the ink on the transfer paper to sublimate and transfer to the flat surface of the lubricating oil barrel under high temperature, thereby forming a clear and firm pattern.
• Transfer system: Involves the transportation, positioning and laminating device of the transfer paper with the barrel body. The transfer paper will be accurately transported to the plane of the lubricating oil barrel according to the set path, and will fit tightly with the barrel body under pressure to ensure the integrity and accuracy of the transfer.
• Control system: The key parameters such as heating temperature, transfer time, and blowing intensity can be accurately adjusted. The operator can flexibly set the parameters according to the material, size, and transfer pattern requirements of the lubricating oil barrel to ensure that each thermal transfer can achieve a good effect。
