Sefa iSPRAY PRO Manuel De L'utilisateur page 22

2021-03-25
d� Right pretreatment amount needed
When having coating problems, adjust the right amount of liquid (ml) from the edit
panel of the machine. The right amount varies, depending on the garment type,
series and brand. The amount can be adjusted from 14ml up to 40ml for the max area
(41x60cm).
1. Insufficient Pretreatment
If too little pretreatment solution is applied, the white ink will have a mottled appea-
rance after printing. This is due to insufficient amount of pretreatment that can't keep
the white ink layer on the fabric's surface (the ink soaks into the fibers of the shirt).
2. Excessive Pretreatment
Applying too much pretreatment solution, will provide you with a very good-looking
print prior to washing. However, excessive application of pretreatment, will cause
poor wash fastness and durability. The white layer becomes much more susceptible
to flaking off the shirt in a wash, when too much pretreatment is applied. A printed
shirt with an excessive amount of pretreatment looks very good after printing and
pressing, but the same shirt, with the excessive pretreatment solution applied, after
washing it exhibits cracking and loss of color.
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