What is the method of measuring PET Braided Sleeve?

According to the shape, PET Braided Sleeve can generally be divided into round (O-shaped), square, special-shaped, etc. According to the material, they can be divided into ordinary PET braided sleeve (hardness is generally 40 degrees, 50 degrees, 60 degrees), foamed Pet Braided Sleeve ( The hardness is generally 20-30 degrees), gas-phase PET Braided Sleeve, etc. The most common ones are round Cable Sleeve and foamed Cable Sleeve. PET Braided Sleeve are commonly used in waterproof sealing of electronic appliances and LED lights, so how to measure the size of PET Braided Sleeve correctly?

First of all, calipers are generally used to measure solid strips. Some people think that the value when the caliper is used to clamp the cable casing is its size. And some people use a caliper to clamp the Cable Sleeve so that it cannot fall into a standard size. Each person's measurement method and evaluation standard are different, and different values will come out.
In fact, the most accurate measurement method should be: use a caliper to clamp the Cable Sleeve, and then slowly increase the size of the caliper. At this time, the size when it does not drop is the actual size measured by the Cable Sleeve. Because the PET Braided Sleeve is formed by extrusion, and then baked at high temperature in the drying tunnel through the belt. Due to thermal expansion and cold contraction, the actual size deviates by 0.1m from the drawing size, which is a normal error.
In short, the extrusion speed of the extruder, the speed of the drying belt, and the shrinkage of the mold will all affect the error of the Cable Sleeve.