Crepe paper tubes are used for transformers with the length of 1.0, 1.8 and 2 meters.
Jin Bao Electric Company now has 5 sets of automatic transformer insulating crepe tube manufacturing equipment which is designed independently and the only one in China, and 3 sets of insulating crepe tube manufacturing equipment. It can produce about 15,000 pieces of insulating crepe tubes per day. JINBAO is the domestic factory with biggest delivery capability of insulating crepe tube. It has successfully developed crepe paper tubes with the length of 1.8 and 2 meters and created two fully-automatic production lines of crepe paper tubes with over-length specifications. The production techniques are becoming more and more perfect through almost one year’s repeated improvements. And the quality of the products is exactly the same with that of one meter. The production technique overcomes the shortcomings of the inconsistency in diameter and easy wrinkling caused by over-length and it can provide crepe paper tubes used for transformers with various specifications from 4mm inner diameter.
The advantages of the crepe paper tubes made by fully-automatic crepe paper tube mills can never be achieved by manual and semi-automatic machines. With the same inner and outer diameters, and according to transformer design principle, more turns creates higher insulativity and tighter winding which contributes to higher elasticity, flexibility, and stronger resistance to bending. So it is possible to product crepe paper tube with the same specification and the same size. The quality of the finished crepe paper tube made by manual weighs only about half the weight of that made fully-automatically because of small volumes of loose layers and the flexibility and intensity is very low.
Besides, crepe paper tubes (also used in oil duct support stripe) employ high-purity PVC adhesive for insulation developed by Jin Bao itself which eliminates the hidden quality danger of doping various types of impurities and thickeners that cannot be avoided when purchasing in market. This adhesive can resist violent rubbing, beating, destruction without breakage and peeling and it has never been complained about its bonding strength by foreign businessmen since its successful development.
The insulating crepe tube produced by the insulating crepe tube automatic machine has advantages that manual and semi-automatic machines do not have at all. As for the same inner diameter and out diameter, in accordance with the design principle of the transformer, the higher the number of turns is, the better the insulation will be. Meanwhile, the more tightly it is wrapped, the higher its elasticity, flexibility and bending resistance will be. Accordingly, with the same specifications and the same number of pieces, the hand-rolled crepe tube is loose because there are fewer layers and the weight of its finished product is only half of that of the automatic products. At the same time, the hand-rolled crepe tube does not have any flexibility and strength at all.
In 2013, JINBAO researched and developed successful glue. After many improvements, it is increasingly mature. JINBAO adopts high-grade pure resin, high reaction temperature and quality production without any impurities and finally, the PVA-based electrical insulation glue with high purity and high effective constituents is produced, which has extremely strong bond strength. This time, glue failures cannot be found in the insulating crepe tubes and oil duct strips produced here any longer, even if they are strongly distorted, beat on hard objects, or torn destructively. And such products have no harms to the transformer insulation. This special PVA glue can meet the demanding requirements for imported products.
