What is the difference between pure polyester yarn and polyester yarn? What are the differences?

 Pure polyester yarn is cut polyester yarn into 32mm, or 38mm long, and then spun. (The length of cotton fibers is about 38mm long).

What is the difference between pure polyester yarn and polyester yarn? What are the differences

36F, 72F, 96F: refers to the number of holes in the spinneret when making polyester yarn. In other words: 150D36F polyester yarn is composed of 36 strands. 150D96F polyester yarn is composed of 96 threads. 150D144F is already microfiber.

It's all conceptual knowledge, please understand it slowly, I hope it will help you.
Also: conversion
1TEX=0.111D=590.6/English branch=1000/public branch
Another: silk = infinite length (continuously produced)
Yarn = cut silk to the same length (38mm), re-spin, weigh yarn (eg polyester sewing thread)