A wide variety of double-walled tubes, including double-walled tubes with glue, waterproof double-walled tubes, environmentally friendly double-walled tubes, flame-retardant double-walled tubes, etc., today we mainly for flame-retardant double-walled tubes are introduced.

Flame retardant double-walled tube (hereinafter referred to as double-walled tube) is a high-end product in PE heat shrinkable casing, developed on the basis of ordinary PE heat shrinkable casing, for the double-layer structure, hence the name double-walled tube. The outer layer is irradiated crosslinked polyethylene material, which plays the role of insulation, wear resistance and so on, and the inner layer is hot melt adhesive, which plays the role of sealing, waterproofing, cushioning and so on. Widely used in military industry, aviation, ships, automobiles, electricity, communications, machinery, electronics and other industries need to seal insulation occasions.

From the 1950s Charlasby found that polyethylene (polyethylene,PE) irradiated crosslinking has the shape memory characteristics from the beginning of the 21st century, from China's first artificial satellite used in the military products to the current small household appliances in the common material heat shrinkable pipe material, Double-walled tubes have been widely used in various industries in modern life. With the invention of better formulations and the use of better processes, the performance and quality of double-walled tubes have been continuously improved, prices have been decreasing, varieties have been increasing, and people's acceptance capacity has been significantly improved, resulting in the expansion of the potential market for double-walled tubes, the expansion of demand and the increase in the scope for development, The following is a brief introduction to the basic status of halogen-free flame-retardant double-walled tubes:

Halogen-free flame retardant double-walled tube is composed of radiant crosslinked polyolefin material and Hot melt adhesive double layer, outer polyolefin insulation, flame retardant, physicochemical and electrical properties are excellent, the inner layer hot melt adhesive can buffer mechanical strain and strong sealing. The main functions are insulation, sealing, waterproofing, anti-corrosion, anti-leakage, etc., widely used in all kinds of wire harness, wire and cable and metal pipe rod, such as sealing insulation, waterproof and anti-corrosion and other fields.

Headphone plug is broken, do not have to change the plug directly repair can also, today to introduce you to the hot shrinkage casing repair Headphone plug specific method.

Double-walled heat shrinkable tube first cut off the plug, and then peel the overcoat out, the earphone cable does not have to be too long 1-1.5CM on it.

After planing, the general earbuds inside there are 3 (there are 4 6 and 8 roots) first, we first use soldering iron to each line surface of the coating to melt off, remember that the soldering iron must have solder, otherwise it is easy to paste off the back caused by not sucking welding, next to the ready to cut the hot shrinkage casing.

When each line is glued to the solder, the headset is properly brought on, and then the amount of left and right (the general headphone line is used in red to do the right green or blue to do the left copper color is shielded), remember if it is a multi-root line, dare not determine which is the shielding line, may need to open the unit to see!

After the distinction is good, we come to prepare the plug, take out the plug we have prepared, also distinguish the left and right channels, here to remember the order of the plug part: The general plug is 3 rings, from top to bottom order, the first ring is the left acoustic high temperature heat shrinkage pipe, the second ring is the right channel, the third ring is shielding. Simply put: Upper left middle right bottom shielding.

Now the distinction is good after the plug welding at the point of a spot welding tin convenient after the welding work!!

After the preparation is done, we first put the seat of the plug on the line, and then ready to weld, align the position and then weld on, remember not to weld the left and right channel back.

After welding, we use a multimeter to measure or plug in the MP3 test, if the sound is not right to re-weld. If everything is all right, we'll press the crimping part of the plug.

Then go up the seat part of the plug. So far, it's basically done, but I suggest that on the seat that can be put on the heat shrinkable casing, it's best to put a hot shrinkage casing on it, so that the protection line part is not bent.

双壁管性能及使用热缩套管修耳机插头

双壁管的种类繁多，包括带胶双壁管、防水双壁管、环保双壁管、阻燃双壁管等，今天我们主要针对阻燃双壁管进行介绍。

阻燃双壁管（以下简称双壁管）是PE热缩套管里的一种高端产品，在普通PE热缩套管的基础上发展而来，为双层结构，故名双壁管。其外层为辐照交联聚乙烯材料，起到绝缘、耐磨等作用；内层为热熔胶，起到密封、防水、缓冲等作用。广泛应用于军工、航空、船舶、汽车、电力、通信、机械、电子等各个行业中需要密封绝缘的场合。

从20世纪50年代Charlasby发现聚乙烯（polyethylene,PE）经过辐照交联具有形状记忆特性开始到21世纪的今天，从我国第一颗人造卫星里采用的军工产品到现在小家电里的常见材热缩管料，双壁管已经广泛应用于现代生活中的各行各业。随着更优良配方的发明和更优秀工艺的使用，双壁管的性能和质量得到不断提升，价格不断降低，品种也不断增加，人们的接受能力也明显提高，使得双壁管的潜在市场扩大，需求扩大，发展空间也随之增加，下面简单介绍下无卤阻燃双壁管的基本状况：

无卤阻燃双壁管由辐射交联聚烯烃材料和热熔胶双层构成，外层聚烯烃绝缘、阻燃、理化电气性能优异，内层热熔胶能缓冲机械应变和密封性强。主要功能是绝缘、密封、防水、防腐、防漏气等，广泛应用于各类线束、电线电缆和金属管棒等的密封绝缘、防水防腐等领域。

耳机插头坏了，不一定要换插头直接修也可以，今天给大家介绍热缩套管修耳机插头的具体方法。

双壁热缩管　　先将插头剪掉，然后剥开线，耳机线不用太长1-1.5CM就可以了。

刨开后，一般耳塞线里面有3根（也有4根6根和8根的）首先我们先用电烙铁把每一根线表面的镀层给融化掉，记得电烙铁上一定要有焊锡，否则很容易就吧线给弄糊掉导致后面不吸焊，旁边准备剪好的热缩套管。。。。

当每根线都粘好焊锡后，吧耳机正确带上，然后量出左右（一般耳机线都是用红色做右边绿色或者蓝色做左边铜色是屏蔽)，记住如果是多根线的时候，不敢确定哪根是屏蔽线，可能需要开单元查看了！

区分好后，我们就来准备插头，拿出我们准备好的插头，也同样区分出左右声道，这里要记得插头部分的顺序：一般插头都是3环的，从上到下的顺序，第一环是左声高温热缩管道，第二环是右声道，第三环是屏蔽。简单的说：上左中右下屏蔽。。。。。

现在区分好后分别在插头焊接处都点上一点焊锡方便后面的焊接工作！！

准备工作都做好后，我们先把插头的座子部分套在线上，然后准备焊接，对准位置后依次焊接上，记住别把左右声道焊反了。

焊接好后，我们用万用表测量或者插上MP3测试一下，如果声音不对则重新焊接。如果一切正常我们就把插头的压线部位压好。

然后上插头的座子部分。到目前为止，基本已经完成了，不过我建议，在能套上热缩套管的座子上，最好上个热缩套管，这样有助于保护线部分不在弯折。