Hem Mills, maker of knitted fabrics, woven fabrics and elastics out of hemp and natural fibers will be moving to Burlington. The company plans to invest $20 million in an 80,000-square-foot facility in the Burlington area. She has not yet finalized a site, but has narrowed her search to two undisclosed locations. The new site will allow Hem to expand its weaving operation by adding spinning capabilities in addition to more than 20 weaving looms, not including equipment it will move from its current facility. Hem Mills expects to open the new plant in the fall and employment of the two-year-old company to grow from six to 32 by the end of the year.