Snap button is a kind of button, commonly known as snap button, spring button, sewing button. Snap-fasteners are combined with S-shaped springs. They are divided into four parts ABCD from top to bottom: AB parts are called female buckles, the wide sides can be engraved, there is a hole in the middle, there are two parallel springs on the side; CD Called the male deduction, a dot is highlighted in the middle, and the dot is pressed into the hole of the female buckle and is clamped by the spring to generate the opening and closing force to fix the laundry.
The needle level: The needle level is divided into four levels, six levels, eight levels and ten levels. The needle detector sensitivity level is usually identified by a scale on the needle sensitivity knob. When the scale or sensitivity indicator is adjusted to 8, it is called eight levels. However, because the height and sensitivity of the needle detector channel are inversely proportional, the height of the needle detector gantry is different, and the sensitivity of the needle detector is also different. Take the SANGKO brand 630 luxury conveyor needle detector as an example. When the sensitivity indicator is adjusted to 8, the 12-channel height 9-point test method can detect the Fe diameter 0.8mm standard test card. The 15CM channel height needle detector nine-point test method can only detect Fe diameter 1.0mm standard test card, 20CM channel height needle detector can only detect Fe diameter 1.2mm standard test card! Visible, the level can not be generalized!
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