Electromagnetic-heating silicon rubber roller and processing method thereof

Abstract

The invention discloses an electromagnetic-heating silicon rubber roller and a processing method thereof. The electromagnetic-heating silicon rubber roller comprises a coil bracket, an electromagneticline and a silicon rubber roller, wherein the coil bracket is made of a non-magnetic material; the electromagnetic line is wound on the coil bracket, and is connected to a high-frequency power supply; the silicon rubber roller sleeves outside the coil bracket; the silicon rubber roller comprises a metal roller inside and a silicon rubber layer coated outside the metal roller; the thickness of thesilicon rubber layer is smaller than or equal to 4 mm; and the electrometric line is heated up for heating the silicon rubber roller. The electromagnetic-heating silicon rubber roller provided by theinvention overcomes the defects of the silicon rubber roller in the prior art, so that the outer surface temperature of the silicon rubber roller can be 300 DEG C or higher; and moreover, the electromagnetic-heating silicon rubber roller can be stably used for a long term, so that the use range of the electromagnetic-heating silicon rubber roller is effectively expanded.

Description

technical field [0001] The invention relates to the technical field of thermal transfer printing, in particular to an electromagnetic heating silicone roller and a processing method thereof. Background technique [0002] The heating roller of the traditional thermal transfer machine is mainly divided into two types, one is an all-metal roller with chrome-plated or Teflon-plated surface, and the other is an externally heated silicone roller. [0003] Among them, the object of all-metal roller transfer printing can only be flexible materials, and rigid materials (such as acrylic plates, aluminum plates, stainless steel iron plates, etc.) cannot be transferred. The external heating silicone roller can transfer rigid materials, and its structure is as follows: figure 1 As shown, but there are also great flaws in its use: [0004] 1. The contact heating area of ​​the external heating silicone roller and the external heating device is limited, generally at most 1 / 3 of the outer ...

AI Technical Summary

Problems solved by technology

[0004] 1. The contact heating area of ​​the external heating silicone roller and the external heating device is limited, generally at most 1 / 3 of the outer circumference of the silicone roller, which requires extremely high power of the heating device, at least 15KW or more , higher heating costs;

[0005] 2. When preheating the silicone roller, it is necessary to keep the silicone roller rotating to heat the whole roller, which requires adding a separate transmission device to the silicone roller, which further increases the use cost of the silicone roller. At the same time, the volume of the silicone roller is increased, which increases the difficulty of installation;

[0006] 3. During thermal transfer printing, it is generally necessary to heat the silicone roller until the surface temperature reaches 160-200°C. However, due to the limited contact area between the silicone roller and the heating device, if you want to heat the silicone roller until the surface temperature reaches 180°C , it needs to be heated for at least 2 hours, which makes the preheating time for each startup long and reduces the work efficiency;

[0007] 4. Since a part of the silicone roller needs to be separated to contact with the heating device, the contact area between the thermal transfer film and the silicone roller is greatly compressed, leaving only 1 / 4 of the outer circumference of the silicone roller at most, which makes The thermal transfer film has a small heating area, which not only causes a large waste of heat, but also further reduces the transfer efficiency

[0008] Of course, there are also internally heated silicone rollers in other fields, but they cannot be used normally in the field of heat transfer printing.

At present, the minimum finished coating thickness of the inner heating silicone roller on the market can only reach 7mm on one side, and the thermal conductivity of silicone is poor. The higher the temperature required for heating, the greater the temperature difference between the inside and the outside. For example, if the outside needs to reach 120°C, the inside temperature needs to reach 200°C, if the outside needs to reach 180°C, the inside needs to reach at least 280°C

The structure of the silicone roller is generally covered with rubber on the outside of the metal roller, and the temperature resistance of the adhesive in contact with the silicone and the metal is poor, and generally cannot exceed 220 ° C. Even if the adhesive with the highest temperature resistance on the market is used, it generally cannot If the temperature is higher than 260°C, otherwise the adhesive will fail and the silicone will fall off from the metal roller. Therefore, at present, the inner heating silicone roller cannot be used in the thermal transfer printing industry

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