热缩套管常见问题 Heat Shrink Tube FAQ
1 Q: How to choose heat shrink tool and pay attention to the problem?
Answer: A uses an oven; B uses an industrial hot blower; C uses boiling water. After a lot of experiments, we found that the heat shrinkable tube produced
by our company shrinks quickly and can save energy for customers. It is recommended to choose the oven (there are two types of sealed thermostat and
tunnel oven). The temperature can be set at 120℃~150℃, and the shrink time of large quantities of casings together is about 3~5 minutes; use industrial
hot air blower The barrel shrinkage time is generally more than 3 seconds, and the hot blower can exceed 200°C at high temperatures. The blower mouth
must be more than 2cm away from the sleeve to avoid scorching the sleeve: The shrinkage method used in boiling water is mainly because some
customers’ products cannot be soaked in water to avoid customers Products are oxidized, such as wires for LCD appliances. A/B two heat shrinkage
methods. For longer sleeves, attention must be paid to the exhaust of the sleeve. It is best to shrink from one end to the other to avoid bubbling after the
air seal shrinks.
2 Q: How to store and transport heat shrinkable materials?
Answer: The heat-shrinkable product should be kept away from direct sunlight or the ambient temperature exceeds 60℃ during storage and
transportation. When the ambient temperature exceeds 60℃, the heat-shrinkable product may partially shrink.
3 Q: How to accurately detect the inner diameter of the heat shrinkable tube?
Answer: The plug gauge (or mandrel) is commonly used. Put the plug gauge into the tube. There is no gap around it visually. The mandrel should be easy
to put in and out of the tube. The outer diameter of the plug gauge is the inner diameter of the casing. The inner diameter value of the heat shrinkable tube
is usually only kept one digit after the decimal point (in mm), and it is also useful for projection only equipment detection. An empirical formula for
measuring the inner diameter of a larger specification casing: inner diameter ≈ folded diameter ÷ 157 (where: folded diameter refers to the width of the
casing when it is compressed in half)
4 Q: How to accurately detect the wall thickness of the heat shrinkable tube?
Answer: The professional and accurate method uses wall thickness gauges or projectors to check, which can avoid human error. Heat shrinkage itself
has a certain degree of flexibility. It is generally used to use vernier calipers to measure, but the measurement process needs to be mastered and the
weight of the method It will obviously affect the test results. In the heat shrinkable tube wall thickness industry, the average wall thickness is calculated
(average wall thickness = (highest point value + lowest point value)/2, and the concentricity rate of its wall thickness is 270%, concentric Rate=lowest
point value/highest point value×100%)
5 Q: How to calculate the axial shrinkage rate of heat shrinkable tube?
Answer: The formula for calculating the shrinkage rate in the axial direction (length direction) of the casing: shrinkage rate = (length before fully
contracted length) before shrinkage × 100%.
6 Question: Why is the number of meters often too short after cutting the heat shrinkable tube?
Answer: After cutting the casing, the customer found that there are a few phenomena, generally it is tens of meters or more according to the number of
cut sections. This is a normal phenomenon. The reason is for example: 5000m each section cuts 10mm, a total of 500,000 segment. Under normal
circumstances, the size of the cut pipe is controlled at 10.1m~10.5mm, so that the required casing length is calculated according to the actual situation:
500000 sections × 10.1mm=5050m or 500000 sections x10.5mm=5250m, plus the loss when the pipe is abnormal. Generally, it takes about 5050m~5250m
of casing pipe to cut 500,000 sections, so if a 5000m pipe is used for cutting, there will be a phenomenon of tube shortage (except for the case of insufficient
package volume).
