Notices for Choosing and Purchasing Thermal Shrinkage Pipes and the Coating Method of Thermal Shrinkage Pipes with Adhesive

Heat shrinkable tubes are now used in a very wide range of life, but there are still many friends who still do not know how to choose a good heat shrinkable casing. Here to introduce you to the hot shrinkage casing purchase need to consider several aspects of the content.

The following four points should be noted when selecting a heat shrinkable casing:

1. Consider how to select a heat shrinkable tube size.

Choosing the right heat shrinkable tube size is best done with the correct measurement. is generally measured by a vernier caliper or a ruler, the minimum and maximum diameter of the object set by the casing needs to be measured. Choosing a heat shrinkable tube is a large Bell that allows space than you measure the maximum measurement value of an object. At the same time, the small metering is taken into account to ensure that the heat shrinkable tube has a high enough shrinkage heat shrinkable tube to ensure that the casing and the object are tightly fit. Finally, when you place an order, buy a little extra, because some heat shrinkable tubes also shrink vertically! This measurement method is known as the "longitudinal shrinkage" specification.

2. Consider a number of important indicators.

The maximum diameter and temperature range of a hot-shrunk object is two important factors to consider when choosing a heat shrinkable tube. Because the size of these products varies greatly, the thermal shrinkage rate is also an important indicator to consider. Since the shrinkage of the heat shrinkable tube requires external heating, the temperature resistance of the heat-shrinkable object is also an important indicator to be considered. Also, if the application environment temperature is high, it is necessary to choose the corresponding parameters of high-temperature heat shrinkable tube.

3. Consider how to choose the Heat shrinkable tube color

Color We generally choose black, because double-walled tube application environment is bad, other colors are not necessary, and special color, manufacturers will charge special processing fees, and inside the color Masterbatch add will also increase the cost, so it is more expensive, but these are only because of customers.

4. Finally, it's a matter of price and quality.

The heat shrinkable tube is divided into two kinds of adhesive heat shrinkable pipe and non-adhesive heat shrinkable tube, and the non-adhesive heat shrinkable tube is usually called a single-walled heat shrinkable tube, and the adhesive heat shrinkable tube is usually called a double-walled heat shrinkable tube (referred to as a double-walled tube). The adhesive heat shrinkable tube is divided into outer layer and inner floor, the outer layer adopts high quality, soft crosslinked polyolefin material, and the inner layer hot melt adhesive is processed by composite. The outer material has the advantages of insulating anticorrosion, wear resistance and so on, the inner layer has the advantages of low melting point, waterproof, sealing and high viscosity high temperature heat shrinkage pipe connection, the adhesive layer can be glued to plastic, rubber, metal, so the adhesive heat shrinkable pipe is often widely used in electronic equipment wiring waterproof, anti-leakage; Water pump and submersible pump wiring waterproof and other occasions.

Adhesive heat shrinkable Tube coating methods are:

1, flat coating: Easy to produce, direct extrusion, can produce continuous pipe, but the adhesive layer is relatively thin, there is uneven wall thickness of the adhesive layer phenomenon.

2, Direct coating: the need for additional adhesive, processing more than a process, can not produce continuous, can solve the problem of sealing due to uneven adhesive layer.

3, spiral coating: The same as direct coating, in addition to glue, and only the production length of less than 300mm, better sealing.

选购热缩管注意事项及带胶热缩管的涂胶方式

热缩管现在生活中被使用的非常广泛，但是依然有很多朋友们仍然不知道如何选择好热缩套管。在这里为大家介绍热缩套管选购中需要考虑的几方面内容。

选择热缩套管应该注意以下四点：

1.考虑如何选择一个热缩管大小。

选择合适的热缩管大小最好采取正确的测量。一般是用游标卡尺或一把尺子来衡量，需测量套管所套物体最小和最大的直径。选择热缩管，要比你量出物体最大的测量值大百分之二十到三十即允许空间。同时兼顾小计量，以确保热缩管具有足够高的收缩率热缩管，以保证套管与物体紧密贴合。最后，在您订货时，买一点点额外的，因为有些热缩管也收缩纵向！这种测量方法被称为“纵向收缩”规范。

2.考虑一些重要的指标。

被热缩物体的最大直径和温度范围是您选择热缩管时要考虑两个重要因素。因为这些产品的大小变化很大，热收缩率也是一个重要指标来考虑。再因为热缩管收缩需要外部加温，所以被热缩物体的耐温程度也是一项考虑的重要指标。还有如果应用环境温度高，就要选择相应参数的耐高温热缩管。

3.考虑如何选择热缩管颜色

颜色我们一般选黑色，因为双壁管应用场合环境是恶劣的，其他颜色没什么必要，再者特殊颜色，厂家会收取特殊加工费，还有里面的色母粒添加也会增加成本，所以比较贵，不过这些都因客户而已。

4.最后还是一个价格和品质的问题

热缩管分带胶热缩管和不带胶热缩管两种，不带胶热缩管通常叫做单壁热缩管，带胶热缩管通常叫做双壁热缩管（简称双壁管）。带胶热缩管分为外层和内层，外层采用优质、柔软的交联聚烯烃材料，内层热熔胶复合加工而成。外层材料具有绝缘防腐、耐磨等优点，内层具有低熔点、防水、密封和高粘高温热缩管接性等优点，胶层可粘接塑料，橡胶，金属，所以带胶热缩管常被广泛应用于电子设备的接线防水、防漏气；电线分支处的防腐保护，电线电缆的修补，水泵和潜水泵的接线防水等场合。

带胶热缩管涂胶方式有：

1、平涂：生产方便，直接挤出，可生产连续的管子，但是胶层相对薄，有胶层壁厚不均匀现象。

2、直涂：需要另外涂胶，加工多一道工序，不能生产连续的，可解决因胶层不均而出现的密封问题。

3、螺旋涂：与直涂一样，另外涂胶，并且只能生产长度300mm以内，密封性更好。