The quality of the needle

Discrimination sewing machine needle body: tail industrial sewing machine needle is a cylinder, rear household sewing machine needle has a cross-section, the long needle groove industrial sewing machine, vary short needle groove and home sewing machines, but the effect is the same , the length of the needle groove is to reduce friction when the sewing thread through the fabric and design, in which a long needle groove Another function is to qualify ring, sewing process, when the needle returns upward, so that the tip of sewing spin Haloxylon line.
Needle quality study from the following aspects:
1, burr: Good needle tip, pinhole smooth; poor quality needle tip burr easily broken spines fiber cloth, fabric damage, pinholes increase; the poor quality of the sewing machine needle pinhole glitch during high speed operation easy to hang up the suture.
2, steel quality: good needle steel is good, there is toughness, poor quality needle because the carbon ratio is not in place, it is too soft or too brittle, soft performance in the needle easily deformed, in the normal course of sewing, a little too much force, the needle will bend, the needle hit the needle plate, causing looper; needle steel brittle performance is not enough, in the normal sewing process, the sewing material is slightly thicker fabric slightly larger dislocation dynamics point will break. The quality inspection machine needle method are the following:
1 tip whether there are glitches can identify with your fingers, changing the contact angle, this method can be directly felt tip if there are glitches;
2, if there are glitches pinhole detection by threading the sewing thread through the pinhole, the best line of long points, grabbed two lines, change direction back and forth up and down, and the needle can freely falling, indicating needle Kongguang Run, conversely certainly there are glitches within the pinholes.
3, check whether the needle bending method is also very simple, the needle will be placed on a smooth level surface, hand rolling machine needles, machine needles remain parallel, indicating no bent needle, and the needle is not consistent with the plane, This can be concluded that the needle has been bent.