|(a) Applicability. The requirements in this division apply to the following flexographic and rotogravure printing processes in the Beaumont-Port Arthur, Dallas-Fort Worth, El Paso, and Houston-Galveston-Brazoria areas, as defined in §115.10 of this title (relating to Definitions), and in Gregg, Nueces, and Victoria Counties: (1) packaging rotogravure printing lines; (2) publication rotogravure printing lines; (3) flexographic printing lines; and (4) flexible package printing lines. (b) Definitions. Unless specifically defined in the Texas Clean Air Act (Texas Health and Safety Code, Chapter 382) or in §§3.2, 101.1, or 115.10 of this title (relating to Definitions), the terms in this division have the meanings commonly used in the field of air pollution control. In addition, the following meanings apply in this division unless the context clearly indicates otherwise. (1) Cleaning operation--The cleaning of a press, press parts, or removing dried ink from areas around a press. A cleaning operation does not include cleaning electronic components of a press; cleaning in pre-press (e.g., platemaking) or post-press (e.g., binding) operations; the use of janitorial supplies (e.g., detergents or floor cleaners) to clean areas around a press; and parts washers or cold cleaners. (2) Daily weighted average--The total weight of volatile organic compounds (VOC) emissions from all materials subject to the same VOC content limit in §115.432 of this title (relating to Control Requirements) divided by the total volume or weight of those materials (minus water and exempt solvent), where applicable, or divided by the total volume or weight of solids applied to each printing line per day. (3) Flexible package printing--Flexographic or rotogravure printing on any package or part of a package the shape of which can be readily changed including, but not limited to, bags, pouches, liners, and wraps using paper, plastic, film, aluminum foil, metallized or coated paper or film, or any combination of these materials. (4) Flexographic printing--A method of printing in which the image areas are raised above the non-image areas, and the image carrier is made of an elastomeric material. (5) Packaging rotogravure printing--Any rotogravure printing on paper, paper board, metal foil, plastic film, or any other substrate that is, in subsequent operations, formed into packaging products or labels. (6) Publication rotogravure printing--Any rotogravure printing on paper that is subsequently formed into books, magazines, catalogues, brochures, directories, newspaper supplements, or other types of printed materials. (7) Rotogravure printing--The application of words, designs, or pictures to any substrate by means of a roll printing technique that involves a recessed image area. The recessed area is loaded with ink and pressed directly to the substrate for image transfer.