Vacuum forming is a simplified version of thermoforming, whereby a sheet of plastic is heated to a forming temperature, stretched onto a single-surface mold, and forced against the mold by a vacuum is formed into permanent objects such as turnpike signs and protective covers. 7178788094934171783-blid-1092598695172505109

เลขเด็ดคนคอนหวัน17/1/63

n