Principle is: the production of heat shrinkable tubing heated to a high elastic state, the application of load to make it expand, in the case of maintaining the expansion of the rapid cooling, so that it enters the glass state, this state is fixed. As soon as it is heated in use, it changes back to the high elastic state, but then the load is gone and it has to retract.
Heat shrinkable tubing is a special heat shrinkable tubing made of polyolefin, which can also be called EVA. The outer layer is made of high-quality soft cross-linked polyolefin material and the inner layer of hot melt adhesive composite processing and become, the outer layer of material has insulation and corrosion, wear-resistant and other characteristics, the inner layer has a low melting point, waterproof sealing and high adhesion and other advantages.
Extended information
Categories and uses of commonly used heat shrinkable tubing
1, PVC heat shrinkable tubing
PVC heat shrinkable tubing has a special function of heat shrinkage, can be heated to 98 ℃ above the contraction, easy to use.
Used for electrolytic capacitors, inductors, the product has good performance of high temperature resistance, no secondary shrinkage, can be printed instead. Used for all kinds of rechargeable batteries, single, combined packaging, and on behalf of the design, printing patterns, and can be cut on behalf of customers. Used for all kinds of curtain rods, shower curtain rods, hanging rods, mop rods, broom handles, tool rods, telescopic rods, garden tools, spreader rods and other tubular items of outer wrapping.
2, PET heat shrinkable tube
PET heat shrinkable tube from the heat resistance, electrical insulation properties, mechanical properties are greatly more than pvc heat shrinkable tubing, more importantly, PET heat shrinkable tubing is non-toxic, easy to recycle, the human body and the environment will not have a poisonous effect, more in line with the requirements of environmental protection.
PET heat shrinkable tubing can be used for electrolytic capacitors, inductors and other electronic components, high-grade rechargeable batteries, toys and medical equipment, the outer covering.
Baidu Encyclopedia - Heat Shrinkable Tubing
The Role of Heat Shrinkable TubingHeat Shrinkable Tubing Uses: Widely used in electronic connections, solder joint protection, wire ends, harnesses, and electronic components of the protective and insulating treatment; fitness equipment parts and components and the steel structure of the surface protection; the related products of the antirust, anticorrosion treatment; electrical wires and other various products, such as the marking. How did the heat shrinkable tubing yellow after bakingThe heat shrinkable tubing yellow after baking is because the storage time is too long. Because PET heat shrinkable tubing storage time is too long will affect its appearance and even the use of performance, so you need to use early or take good care of measures. Special attention is double-wall heat shrink tubing this type of heat shrinkable tubing, long storage time to bring the opposite effect is very big, will cause the internal adhesive layer yellowing or even peeling phenomenon, so users need to pay special attention to this type of heat shrinkable tubing storage time, to avoid causing the user's economic loss of the situation.
What is heat shrinkable tubing how to use heat shrinkable tubingHeat shrinkable tubing refers to: polyolefin as the main material for the production of tubular products, the use of heat shrinkage in the surface of the wrapped object.
Heat shrinkable tubing has cross-linked shrink tubing, and those that do not require cross-linking (expanding at the same time when extruded).
The ones that do not require cross-linking are PVC heat shrink tubing and PET heat shrink tubing.
Crosslinked heat shrink tubing, there are irradiation crosslinking, there are chemical crosslinking; general electronic heat shrink tubing are radiation crosslinking.
The shrinkage of heat shrink tubing, mainly by heating, can be an open flame, can be an electric air gun, can be an oven/tunnel furnace, you can also use water vapor, there are many ways.
Pure hand-typed, please adopt.
Heat shrink tubing will blow open how?Shrinkable tubing rupture reason is that the heat-shrinkable tubing itself may have a notch at the cut, in the heating due to contraction extension leads to the notch becomes larger and then rupture. Reason two is the heat shrink tubing local high temperature overfire, such as in the process of open-flame operation first with carbonization and then there will be cracked. The third reason is that there are sharp foreign objects in the tube caused by the heat shrinkable tubing contraction was cut, so before using the heat shrinkable tubing need to first check whether there are foreign objects in the tube.
What is the heat shrink time and temperature of heat shrink tubing?The heat shrink time and temperature are different for different types.
PVC and PET type, the minimum shrinkage temperature 35 ℃, but this temperature is very weak shrinkage, so these products require storage temperature below 30 ℃. The minimum temperature of rapid shrinkage is 90℃ or more;
PO heat shrinkable tube shrinkage temperature, 90℃ for ultra-thin, 110℃ for regular.
PE and PVDF's, the shrinkage temperature reaches 125 ℃ and 150 ℃ or 175 ℃, respectively. PTFE material shrinkage temperature to more than 200 ℃.
PVC heat shrinkable tubing and PET heat shrinkable tubing comparison:
PVC heat shrinkable tubing
PVC heat shrinkable tubing has a special function of shrinkage in the event of heat, heating 98 ℃ or more can be contracted, easy to use. The products are divided into two series according to the temperature resistance of 85℃ and 105℃, specifications Φ2-Φ200, the products comply with the EU RoHS environmental protection directive. Used for electrolytic capacitors and inductors, the products have good performance of high temperature resistance, no secondary shrinkage, and can be printed instead. Used for various rechargeable batteries, single, combination packaging, and design, printing patterns, and can be cut on behalf of customers. Used for all kinds of curtain rods, shower curtain rods, hanging rods, mop rods, broom handles, tool rods, telescopic rods, garden tools, spreader rods and other tubular items of outer wrapping. It can also be used for marking and insulating outer wrapping of copper rows, connectors and wire harnesses of low-voltage indoor bus bars. High efficiency, low equipment investment, small comprehensive cost. It is used for the wrapping of lamps and LED pins, and the wrapping of guitars and packaging bottle mouths, and is a new generation of packaging materials. Whether it is for civil, automotive or military use, it is the top choice.
PET heat shrinkable tubing
PET heat shrinkable tubing (polyester heat shrinkable tubing) from the heat resistance, electrical insulation properties, mechanical properties are greatly more than pvc heat shrinkable tubing, more importantly, PET heat shrinkable tubing is non-toxic, easy to recycle, the human body and the environment will not have a poisonous effect, and more in line with the requirements of environmental protection.
The environmental performance of PET heat shrinkable tubing is higher than the EU RoHs Directive standard, and can reach Sony SS-00259 environmental standards. It does not contain cadmium (Cd), lead (Pb), mercury (Hg), hexavalent chromium (CrVI), polybrominated biphenyls (PBBs), polybrominated diphenyl ethers (PBBEs/PBDEs), polychlorinated biphenyls (PCBs), polychlorinated terphenyls (PCTs), polychlorinated naphthalenes (PCN) and other banned substances of the 1st level of environmental management, and it is the best choice for the outer wrapping of electrolytic capacitors, inductors and other electronic components, high-grade rechargeable batteries, toys and medical devices, and can fully meet the export requirements.