The other important factor is the approach to take towards cleaning solutions
- low VOC or low vapor pressure. Each of the different types of washes posses
their own advantages and disadvantages. Many of the low VOC washes have
recently used vegetable oils or vegetable oil derivatives to reduce the VOC
content. These types of washes have met with limited success as hand washes,
but have produced excellent results in several automatic blanket wash systems.
However, some printers have used these washes as hand washes with acceptable
results. Low vapor pressure washes, those with less than 10 mm Hg at 68oF,
have been used with good results by printers. While they are considered 100%
VOC, they result in lower VOC emissions because they do not readily evaporate.
Regardless of which wash is chosen, it is important to understand that the
press operators should be involved in the new wash evaluation program. Many of
these washes require changes in work practices and will require time for the
operators to adjust to the new cleaner. Some of the washes require additional
time and effort to get them to properly work. Some leave films that require
additional effort to remove.