Its basically when the material gathers. Its called this because it looks like lips when one puckers.
As sewing machine is 6x times faster than hand sewing and it can even be more. It is a good investment to get a sewing machine because it saves a lot of time.
theory of sewing machine
Sewing Kit
There are about 100 different sewing techniques!
what is the function of the head of the sewing machine
Thomas Puckering died in 1636.
Thomas Puckering was born in 1592.
John Puckering died in 1596.
John Puckering was born in 1544.
Often, if you match the weight of the fabric to the trim it will not pucker. If either material is stretchy, you need to be careful that it is not stretched at all as you sew. If these two things do not work, use an interfacing or stabilizer to keep the materials from puckering.
Crinkle.
If your fabric is puckering, you need to check your thread tension and adjust as needed until you have flat stitching. Another solution would be to completely untread and rethread your machine and rewind the bobbin using a medium speed for the thread loading.
It has to do with changes to the shape of the DNA helix.
tardive dyskinesia
If you kiss it it gives you the "Gift of the Gab"
Orbicularis oris. Controls the puckering of your lips (labia).
Orbicularis oris