3.1 Coatings & Inks

3.1.1 Emissions

Introduction

Organic emissions from the manufacturing of coatings and inks are reported in this category. Coatings processes includes mixes, blends, or compounding of paints, varnishes, lacquers, enamels, shellac, or sealers from raw materials. Ink manufacturing involves mixes, blends or compounding other raw materials to produce the ink. Printing inks consist of pigments, which produce the desired colors, binders which lock the pigment to the substrate, and solvents, usually organic compounds that dissolve the pigments and binders. A majority of the emissions originate from mixing and cleaning operations. Throughput information of each source is reported by the facilities and is stored in the District’s Data Bank system.

Methodology

Organic emissions are calculated by using data on the reported throughput, the specific materials ( i.e. density, percent VOC in coatings, etc.) as supplied by the companies through the District “S” and “G” forms. The District updates the data each year on a source-by-source basis using as input:

  1. Process material throughputs as reported annually by the chemical manufacturing companies.

  2. Emissions factors (these may be source specific factors reported by the companies through source test results or applicable general factors, i.e. from the EPA).

  3. Emissions control factors (device-specific or general - these may be supplied by the companies also).

The county, month, and day factors are obtained from the data bank’s information on each plant’s location, seasonal usage, and days per week of operation.

Monthly Variation

Monthly distribution was estimated based on major coatings and inks manufacturer’s reported quarterly percent throughput. An attempt was made to weight-average into monthly factor, with March through August being the high season and November and December being the lowest.

County Distribution

The county location of each company as reported in the Data Bank is used to distribute emissions into each county.

Table 3.1: County fractions.
category ALA CC MAR NAP SF SM SNC SOL SON
#23 Coatings and Inks Manufacturing 40.0% 2.0% – – 34.0% 22.0% 2.0% – –