After a detailed investigation and research in the field of plastic caps without liner, Door Plastic Tehran Co. (dpt) started it’s production activity in this connection, from 2001 in Eshtehard Industrial Zone. Having a share and benefitting from the outmost updated universal technologies, while achieving Quality management system (ISO 9001), Environmental management system (ISO 14001), and Occupational health and safety management system (OHSAS 18001), brought dpt the means of swiftly flourishing in this business and to became one of the most creditable brands active in this field among Iranian and Middle east companies.