household daily use,baby safety products,casual backpacks

Is the silicone tableware for baby eating really safe? "Is the   silicone tableware for baby   eating really safe?" To be sure, silicone is indeed a very suitable material for babies. Many products related to baby's entrance will choose silica gel and plastic materials to be used alone or in combination, such as milk bottle, pacifier, dental glue, bite music, tableware, straw, etc. These products made of silica gel and plastic are light and soft, but also resistant to falling, high temperature, skid resistance and good heat insulation. And because these products will be imported by babies, the materials used are food grade and do not contain BPA.   When parents choose tableware for their baby, they can choose qualified plastic /   silicone tableware   for their baby as long as they pay attention to the following points. 1. Select food grade PP / food grade silica gel. Food grade PP can be used in the temperature range of - 20 ℃ to 120 ℃, while food grade silica ...

  The characteristics of the cooling fan itself are different from other products.   Brushless cooling fan   actively stirs the air and accelerates the airflow, so it also sucks in dust. There are two main aspects of inhaling dust. One is sucked into the bearing and the other is sucked into the rotor and stator. Inhalation of dust more or less affects the cooling fan, causing the fan to slow down and even stop the fan in severe cases. Commonly used  dust-proof cooling fan  design methods generally have the following three aspects: 1. When designing, increase the height of the outer frame where the motor is installed to allow the motor to sink, reduce the distance between stator and rotor, and reduce dust entry. 2. Using double ball bearings, the balls have a certain degree of dust resistance, and the bearings are not susceptible to serious interference. 3. Add a dust-proof net cover to the cooling fan, which is durable and can effectively prevent dust from enter...

  Motors that power   ventilation cooling fans   are usually divided into brushless motors or induction motors. Brushless motors are sometimes called electronically commutated motors. Commutation refers to the act of switching the electrical connection from one motor winding to the next one. Motor windings in the  DC cooling fan  motor  is generally located in the stator or stationary portion of the motor. Then the rotor contains a magnet with alternating poles. (DC motor with the magnets in the rotor are sometimes called outrunner. There are other possible configurations but they are not as widely used as outrunners.) The  brushless DC fan  motor uses an electronic controller to sequentially energize the stator windings, turning them into electromagnets, in a sequence that turns the rotor. First, one set of coils (that is, a coil and the coil located 180º away from it) would be energized to become electromagnets. This causes the opposite poles of...