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  Today we received a package from Australia, this is a surprise package came from a customer. We never meet each other, but we are doing a lot of business in this years. Before this, he was selling some ski straps and other products on the Internet and the products were selling well.  Since we met him online, he wants to sell some ski bags, he provided us their own design files even just some ideas, we made samples for their reference and also gave our suggestions. After that, he gave us big orders. We do our best to ensure the products with good quality in the mass production. So his  ski travel bags ​ such as ski bag, padded ski bag and ski boot bag combo grown up quickly and selling well in 2020. In the gift package, there is a glass trophy, it said that awards Best Manufacturing Partner 2020 presented to our company. "This honor belongs to the joint efforts of all the people in our company, it's also the customer's affirmation and praise to our company. The...

  The design of the magnetic core does not allow any current to flow. However, it is a conductive loop that undergoes a changing magnetic field, so small currents are induced in it-these are called "eddy currents." Laminated cores  reduce it to a minimum because they interfere with the effective transmission of energy from the primary coil to the secondary coil. Eddy currents cause energy loss from the transformer when heating the core, which means that electrical energy is wasted as excess heat. Laminating refers to "consisting of insulating layers of iron "glued" together", rather than in a single solid "block." Compared with non-laminated cores having the same number of domains, laminated cores have higher electrical resistance. Therefore, it does not generate such a large current.

  Transformer  windings are another important part of the transformer structure because they are the main current-carrying conductors wound on the laminated part of the core. As shown in the figure, in a single-phase two-winding transformer, there will be two windings. The one that is connected to the voltage source and generates magnetic flux is called the primary winding, and the second winding is called the secondary winding. The result of mutual inductance is the induced voltage. If the secondary output voltage is less than the primary input voltage, the transformer is called a "step-down transformer". If the secondary output voltage is greater than the primary input voltage, it is called a "boost transformer". ​ The type of wire used as the main current-carrying conductor in the transformer winding is copper or aluminum. Although aluminum wire is lighter and generally cheaper than copper wire, it must use a larger conductor cross-sectional area to carry the sam...

  Travel bag, is also called   duffel bag ​, refers to a kind of bag prepared for travel or tourism. Travel bag can be divided into duffel bag backpack, travel tote bag and rolling duffel bag. In the selection, the volume and style should be considered. In addition, the user's figure, body shape and load capacity should also be considered. Because the outdoor travel bag is used in special environment, the material and technology of the travel bag are highly demanded. All the stressed positions of the travel bags are sewed by sewing machine for three times, so that the stressed positions should be firm and durable. Travel bag can be divided into leisure travel bag and business travel bag according to the different application environment. Size selection: the size of travel bag can be determined according to your own body and hand strength. Smaller people or girls are advised to use travel bag with tie rod to reduce the travel burden. The business travel bag should match the bus...