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The following safety instructions
should be observed when working with the
VITA SPRAY-ON SYSTEM:
The liquids (INDICATOR and SPRAY-ON LIQUID), that are used for mixing
together with the opaques for the spraying technique contain approx. 90%
ethyl alcohol (ethanol).
Hazard description:
F highly flammable
Ethanol is an easily flammable, volatile liquid and can produce explosive
vapor/air mixtures. If swallowed or inhaled in large amounts it may cause
intoxication and symptoms of poisoning.
The following safety precautions should, therefore, be observed for storing
solutions and mixtures containing ethanol and also for the spray technique:
• Keep the lid closed tightly and store in a cool and well
ventilated room.
• Flammable liquids belonging to groups A1 and B
(these include ethanol) may only be stored in 1 liter
containers for use on the job (manual use).
• Protect against heat and keep away from possible sources
of ignition.
• Observe – No smoking – restriction.
• Never spray into open flames or onto glowing objects.
• When working without a spray box, always wear safety
glasses and gas filter mask (gas filter type A; equivalent to
a spray painting mask): Spray against a moist towel or
appropriate filter for absorbing the spray particles; always
provide adequate ventilation.
• If the VITA SPRAY-Box is to be connected to an exhaust
system or is to be used under an extractor, a high exchange
of air must be guaranteed so that no dangerous solvent
concentrations can be produced.
The VITA SPRAY-ON SYSTEM
Introduction
The VITA SPRAY-ON System offers the following advantages:
1. Easy to use.
2. Reduction of working time by up to more than 50%.
3. Saving of materials and costs, due to the storing of already
mixed materials in closed retainers, ready for use when
required.
4. Thin, well-proportioned layers of opaque porcelain.
5. More room to build up the other layers of porcelain,
especially in areas that pose problems.
6. Optimum bond between opaque porcelain and metal alloy.
7. Depending on the technique employed, a variety of
surface textures can be achieved, thereby allowing variation
in the absorption, diffusion and reflection of light.
Installation
For installation and connection, see diagram page 11.
Adjusting the sprayer needle
The sprayer needle is very soft. Therefore, care must be taken that it
is not bent. Successful spraying without clogging is dependant on the nozzle
opening. Coarser-grained porcelains require a wider opening.
So the needle should be pushed further back using the adjustment screw.
When spraying fine-grained opaque porcelains, the needle should be
positioned more to the front.
To move the needle forward, the adjusting screw and the locking nut situated
at the rear of the spray gun are turned clockwise. Turning them anti-clockwise
pulls the needle back.
Note: Should the spray gun clog up after a while, widen the nozzle
opening so as to allow an unobstructed flow of the opaque porcelain. Just
move the adjusting screw and the locking nut clockwise (that is to the left) by
a half or a full turn, until the opaque porcelain flows freely.
Mixing the opaque porcelain
Fill the respective glass retainer up to a maximum of
The vent hole of the adapter lid clogs up easily when the opaque porcelain
is shaken. A blocked vent hole can lead to the development of a vacuum
and impede proper spraying.
The more opaque porcelain is in the glass retainer, the more it tends to form
a sediment at the bottom and become heavy bodied. For perfect spraying the
opaque porcelain should have a watery, milk-like consistency.
The composition of the VITA SPRAY-ON LIQUID is such that it allows a light-
bodied mixture. As it evaporates very quickly, more than one layer of opaquer
can be applied without having to predry the coated framework in a furnace
each time. After mixing the opaque porcelain powder with VITA SPRAY-ON
LIQUID, the adapter lid is attached to the glass retainer and then connected
to the spray gun.
Normal operating pressure is 0.7 - 1.0 bar. Attach a retainer containing a
fresh opaque porcelain mixture. Hold the sprayer button depressed. If after
two seconds no opaque porcelain is ejected from the nozzle, increase the
pressure to between 1.1 and 1.4 bar. Should the opaque porcelain be spray-
able, it ought to be carefully diluted until it can be sprayed at a pressure of
0.7 bar. If the opaque porcelain is still not sprayable at a pressure between
1.1 and 1.4 bar, the grain of the opaque porcelain is most probably too coarse
for spraying with the needle in the current position. Retract the needle a litt-
le. Generally, you can adjust the pressure to suit yourself (Range: approx. 0.5
to 4.5 bar). The mixture is too thin, when spraying at a distance of 2 to 5 cm
the opaque porcelain on the framework is runny. Should this be the case, sim-
ply add more opaque porcelain powder.
Spray at a distance of between 6 and 8 cm. Example: Spray opaque
porcelain onto a larger coin from a distance of less than 6 cm. The opaque
layer on the coin is verx moist. If the distance is too small, the low pressure
will lead to a wavy pattern on the surface. If you spray at a distance of more
than 10 to 15 cm, the opaque porcelain will be almost dry when it hits the
surface of the coin.
The opaque porcelain should display a slightly moist sheen, when it hits the
surface of the framework. It should, however, not run. This allows the buildup
of several layers of opaque porcelain. If the opaque porcelain hits the
framework in too dry a state, the fired surface will be rougher. The rougher
the surface is, the more light will be reflected in scattered form. The metal
framework should in no case be heated before the opaque porcelain is
applied.
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