The linens should be damp so wrinkles are not set prior to
finishing. The ironer is not designed to remove wrinkles from
dry linens. Moisture retention should range between 20 to 35
percent. Excess moisture will result in slower ironer speeds,
reducing production and possible shrinkage.
Ironers are manufactured with either heated chests or heated
rolls. Typically the high production machines utilize heated
chests as this design offers a more uniform heated surface. The
desired temperature will range from 325 to 350 degree's
Fahrenheit for steam heated ironers. Thermal oil heated ironers
offer a higher operating temperature.
The heat from the ironer transfers the moisture from the linens to
the padded rolls and to the atmosphere over the exposed chest
area. On ironers with vacuum assisted rolls, moisture is also
eliminated via the suction of the vacuum system from the interior
of the rolls. Padded rolls will absorb heat from the chests to
assist with the moisture removal. The more roll to chest contact
will result in faster drying times. Under or over padded rolls will
reduce the efficiency.
The linens obtain their gloss, sheen and crispness appearance
from the sliding or gliding of the linens traveling tightly over
clean, smooth, polished, lubricated chests. It is important that
the chests remain clean and waxed properly.
Padded Roll Resilience
The definition of resilience is, "the property of a material that enables it
to resume its original shape or position after being stretched or
compressed; elasticity". A padded spring roll offers better resilience
than a padded hard roll due to the springs. The resilience of the roll
absorbs the irregularities of linens, seams, hems, embroidery, etc.,
offering constant contact between the roll and chests resulting in
uniform ironing over the entire cloth area. When the roll padding,
covers or springs wear over time, the degree of resiliency minimizes.
The average life of roll springs is approximately 10 years. Replacing the
springs once worn, will ensure the optimum performance of the ironer.
The pull or stretching of the linens from roll to roll is an important part
of achieving a quality finish. Earlier model ironers were designed with
the chests butting up to each other. Newer models have a heated transfer
plate. This allows the linens to travel over a heated surface for
continuing moisture removal between the roll and chest contact. The
diameter of the rolls increase from the feed roll to the discharge roll. By
doing this the linens are pulled and stretched from one roll to the next as
it passes through the ironer. The diameter and the resiliency of the
rolls is important to ensure proper linen travel through the entire ironer.