English to Japanese Tech/Engineering Paper / Paper Manufacturing Web Formation

"The headbox plays a key role in the formation of the qualitative properties of paper. Since the furnish used also affects the optimum values of the headbox control parameters, headbox controls need to be optimized on the basis of test runs every time a new headbox is put into use."

According to the document, "Furnish" greatly affects web formation. Other factors that affect web formation include freeness, chemical additives, dewatering, etc.

The word "furnish" only appears in the above sentence, as well as in a table of factors that affect web formation, in which the term "furnish" appears independently as an item (factor).

Any ideas what this term could mean?

TIA