Of cleansing Goods, previous to Maddering, or bailing off.
A Treatise on Calico Printing, VOL. I-II
Printed for C. O'Brien, Bookseller, Islington, and fold by Bew, Paternoster-row: Richardson, Royal Exchange: Murray, Fleet-Street: And the Booksellers of Manchester, Glasgow, Dublin, &c.
1792
---
(20) The term colour must in this case be used here, as well as elsewhere, though improperly, it being, strictly speaking, the non-colouring article combined with the thickning or sightning, so the colour is not produced till the work is in the copper. - See the note at the beginning of colourataking.
In some places the goods are put on a roll or winch before brought to the copper, and put into its as turned off from the roll.
(21) The vehicle (or thickening) for carrying the allum, &c. they must be supposed to know of, as. there can be no preparation matter on the cloth for their processes without it. A copperman, however, may be deceived in sorting the pieces, as some with heavy sightning may not have such deep or heavy colour as others that have no sightning.— See the article maddering.
(22) Here is included the resinous paste used in printing, and where paper preservatives have been used.
(23) With tender or pale colours it is a material mat ter that all the pieces of the same pattern be equally dried, for supposing a piece to be boiled off with a bare stowing and another of the same colour has been in a hot stove several days, there certainly is a chance of the colours of the two pieces varying. —See note 8 and more to this effect addressed to the oolour-maker. The goods being now supposed to be printed, and properly stowed or dried, they are to be snitchelled or folded, and brought to the copper-house; which being done, throw them into a copper of bran liquor made warm, and winch them as quickly as possible, otherwise the colour may start or run,(20) but this depends very much on the nature of the thickening or sightning; for if either be of so loose a kind, that it is quickly removed, the operation, it need hardly be said, will be as quickly performed; but if of a contrary quality it consequently takes longer time; this circumstance of the quality of the thickning or sightning, is however not what every copperman looks at, or ever sometimes whether there be any sighting at all, (21) though if the goods are proiperly and thoroughly cleared, it perhaps is little matter whether he knows the difference or not; but if he regulates his clearing by time, that is, uniformly allowing so much time to a copperfull, let the thickning or sightning be of any quantity or quality, he may be much deceived; for, (as said before) some kinds of sightning are more difficult to be cleared than others, as well as some kinds of paste-work; or will bear the water more heated; (22) hence in this case, a deal depends on the copperman's judgment, and in this instance it therefore behoves him to be attentive, as well as in the next operation of dunging, for if carried too far, in respect to heat, the certain consequence must be some destruction to the work in boiling off. (23)
Ei kommentteja :
Lähetä kommentti