There are many kinds of double-walled pipes, including rubber double-walled pipes, waterproof double-walled pipes, environmentally friendly double-walled pipes, flame-retardant double-walled pipes and so on. Today we mainly introduce the flame-retardant double-walled pipes.
Flame-retardant double-walled tube (hereinafter referred to as double-walled tube) is a high-end product in PE heat-shrinkable sleeve. It is developed on the basis of ordinary PE heat-shrinkable sleeve. It is a double-walled structure, so it is called double-walled tube. Its outer layer is irradiated cross-linked polyethylene material, which plays the role of insulation and wear resistance; the inner layer is hot melt adhesive, which plays the role of sealing, waterproof and buffer. It is widely used in military, aviation, ship, automobile, electric power, communication, machinery, electronics and other industries where sealed insulation is needed.
From Charlasby's discovery in 1950s that polyethylene (PE) has shape memory properties through irradiation crosslinking to the 21st century, from the military products used in China's first artificial satellite to the common heat-shrinkable pipes in small household appliances, double-walled pipes have been widely used in all walks of modern life. With the invention of better formulation and the use of better technology, the performance and quality of double-walled tubes have been continuously improved, the price has been decreasing, the variety has been increasing, and people's acceptance ability has also been significantly improved. This has expanded the potential market of double-walled tubes, expanded the demand, and increased the development space. Here is a brief introduction of the basic situation of halogen-free flame-retardant double-walled tubes:
Halogen-free flame-retardant double-walled tube is composed of radiation cross-linked polyolefin material and hot melt adhesive. The outer polyolefin has excellent insulation, flame retardant, physical, chemical and electrical properties, and the inner hot melt adhesive can buffer mechanical strain and seal well. Its main functions are insulation, sealing, waterproofing, anticorrosion, air leakage prevention and so on. It is widely used in the fields of sealing insulation, waterproof and anticorrosion of various wire harnesses, wires and cables and metal pipe bars.
Headphone plug is broken, not necessarily need to change plug to repair it directly. Today, I will introduce the specific method of repairing headphone plug with heat shrinkable sleeve.
The double-wall heat shrinkable tube first cuts off the plug, and then strips off the wire. The earphone wire does not need to be too long 1-1.5CM.
After shaping, there are 3 (4, 6 and 8) inside the earplug wires. First, we melt the coating on the surface of each wire with electric soldering iron. Remember that soldering tin must be on the soldering iron. Otherwise, it's easy to make the wires blurred so that the back is not suction welded, and the heat shrinkable sleeve is ready to be cut beside it.
When each wire is bonded with solder, put the earphone on correctly, and then measure it out (usually the earphone wire is made of red to the right green or blue to the left copper to shield). Remember that if there are multiple wires, you are not sure which one is the shield line, you may need to open the unit to see it!
After distinguishing, we will prepare the plugs, take out the plugs we have prepared, and also distinguish the left and right channels. Here we should remember the sequence of the plug parts: generally, the plugs are all three rings, from top to bottom, the first ring is the left acoustic high temperature condensation pipe, the second ring is the right channel, and the third ring is the shielding. Simply put: shielding from the upper left, middle right and lower right.
Now after distinguishing the plugs, point a little solder at the solder joint to facilitate the welding work behind!!
After all the preparatory work is done, we first put the socket part of the plug on line, and then prepare to weld. After aligning the position, we weld it in turn. Remember not to reverse the left and right channel welding.
After welding, we use a multimeter to measure or plug in an MP3 to test it. If the sound is not correct, we will re-weld it. If everything is all right, we'll press the line of the plug.
Then put on the seat part of the plug. So far, it has been basically completed, but I suggest that it is better to put a heat-shrinkable sleeve on the seat where the heat-shrinkable sleeve can be sleeved, so as to help protect the line part from bending.