The heat Shrink Tube is not an important device in the circuit design, but it plays a role in protecting the circuit and important devices. However, only by selecting the Heat Shrinkable Tube according to the appropriate size can the circuit be protected to the greatest extent. Let's take a look at the 7 knowledge points you should know about Heat Shrinkable Tube.
1. Inner diameter: We know that the cross section of the casing is cylindrical, and the inner diameter is the inner diameter of the pipe wall, that is, the distance between the inner walls. We usually use the letter φ to represent it, because φ is used to mark the diameter in engineering, followed by a number to indicate the value of the inner diameter. If the unit is not written by default, it is MM, mm, such as φ6.
2. Wall thickness: refers to the thickness of the pipe wall, and the inner diameter reflects the size of the pipe. What this wall thickness refers to, intuitively speaking, is the thickness of a thing, so what does the thickness affect? We know that the Heat Shrinkable Tube plays the role of insulation protection, so the thickness affects the size of the insulation protection. We all know that the thicker the clothes, the greater the effect of keeping warm and cold, and the thinner the clothes, the less the ability to keep out the cold. Therefore, the wall thickness of the heat-shrinkable tube affects its protection ability, so in a word, the thicker the heat-shrinkable tube, the better its mechanical protection ability.
3. Shrinkage rate: The Heat Shrinkable Tube will shrink when heated, but only things that shrink will have this parameter. Sometimes shrinkage is also referred to as heat shrinkage, heat shrinkage, etc. It refers to the diameter of the heat-shrinkable tube at room temperature, such as φ6, and the diameter after heat shrinkage, such as φ3. Then the shrinkage rate we are talking about is the ratio of the inner diameter of the Heat Shrinkable Tube before shrinkage to the inner diameter after shrinkage, that is, 6/3=2/1. This 2:1 is the casing. If the Heat Shrinkable Tube is φ6 before shrinkage and φ2 after shrinkage, and the size is only two millimeters, then its shrinkage ratio is 6:2, which is 3:1. If the shrinkage is 1.5mm, then the shrinkage ratio is 4:1, and the shrinkage ratios of common Heat Shrinkable Tube are 2:1, 3:1, and 4:1.
Speaking of shrinkage, let's move on to wall thickness, like a cowhide band. The wall thickness will be thinner when stretched, and thicker when contracted. Similarly, after the Heat Shrinkable Tube shrinks, the wall thickness will also increase. For heat-shrinkable tubes, the more important wall thickness refers to the wall thickness of the heat-shrinkable tube after shrinkage, because it is such a state after shrinkage, which protects the working state of our heat-shrinkable tubes. The so-called shrinkage of Heat Shrinkable Tube refers to radial shrinkage, because in theory, longitudinal changes are not allowed for Heat Shrinkable Tube.
4. Shrinkage temperature: On the surface, it is the temperature when the Heat Shrinkable Tube starts to shrink. We start heating from the heat-shrinkable tube, and when the heat-shrinkable tube starts a certain reaction, it is the temperature at which the shrinkage reaction just starts. Our general PE heat shrinkable sleeves start to shrink at 84°C, that is, the shrinkage reaction begins.
5. Final shrinkage temperature: refers to the temperature at the end of shrinkage, which can make the Heat Shrinkable Tube reach the temperature of complete shrinkage. For example: we heat the heat-shrinkable tube to 84°C, which is not like a cowhide band. As long as I lift it up, as soon as I let go, the cowhide will spring back completely and return to its original shape. However, our Heat Shrinkable Tube is not like this. When heated to 84 ° C, it will not immediately return to its original shape like a cowhide band.
Shrinking our Heat Shrinkable Tube is a gradual process. When we heat the Heat Shrinkable Tube to 84°C, it only shows shrinkage, so it is impossible to shrink completely. We must continue heating to the final shrinkage temperature. If it is 120°C, it can be completely shrunk.
6. Working temperature: This temperature is an important parameter throughout the heat-shrinkable tube. The working temperature sometimes refers to the rated temperature, that is, the temperature at which the sleeve can work normally and continuously. The first two temperatures refer to the processing of the heat-shrinkable tube that can reflect the shrinkage. temperature.
Let's take the φ6 heat-shrinkable tube as an example, heat the heat-shrinkable tube slowly with a heat gun, when the temperature starts to reach 84°C, the heat-shrinkable tube starts to shrink, and then slowly shrinks to φ5 and φ4. When the temperature reaches the final shrinkage temperature of 120°C, the heat-shrinkable tube completely shrinks to φ3, shrinks tightly on the object, and the processing and heating process ends. Then, install this part with the Heat Shrinkable Tube on top of the air conditioner, etc., and work normally, its normal working environment.
Shenzhen Huiyunhai Tech.Co., Ltd.
