Code 4207 applies to employers engaged in manufacturing pulp by means of chemical process.  The raw materials used in this process are debarked logs, wood chips, rags, textile mill waste, wastepaper and hardwood may be used as well.  Chemicals may vary depending on the specific method the employer will undertake and are received from others.  The equipment used includes barkers, chippers, electrical and mechanical drives for saws, rotary digesters, steam boilers and pumps for handling liquors and conveyors for handling the wood chips.

The process begins with removing the barks from the logs by passing the logs through knife barker or barker drums.  Once the logs are debarked, they are placed on a conveyor and sent to rotating disk chippers.  As the log passes through the rotating disk chippers it leaves small chips.  Chips are placed in digesters and filled to a specific level and the chemicals are added.  The combined ingredients of wood chips and chemicals are heated for several hours by indirect heaters or steam.  When cooking of the mixture has been completed, the pulp is separated from the liquor.  The waste liquor is drained from the pulp.  The pulp is then washed, screened, thickened to the proper consistency by removal of the proper amount of wash water, and then bleached to the desired color.  The manufactured pulp is sold to paper manufacturers.