Did you know? 1st blow-molding patent

The first patent for the processing of extruded polymer into a parison for blow molding was issued on Feb.1, 1881 to Celluloid Novelty Co. and Celluloid Manufacturing Co., New York. The first applications for blow molders were for cellulose nitrate and, in the 1930s, for cellulose acetate. Blow molding remained a relatively small part of the plastics manufacturing scene until the introduction of low-density polyethylene in the 1940s. The production of LDPE squeeze bottles by Monsanto caused a rapid expansion of the industry. The mass production of high-density polyethylene and polypropylene in the 1950s led to a further increase in blow-molding demand. Source: Wikipedia