from residue and foreign matter that may cause malfunction of the spray
guns. The paint applicator shall be readily adaptable for attachment of an
air-actuated dispenser for the reflective media approved for use.
Provide
pneumatic spray guns for hand application of paint in areas where the
mobile paint applicator cannot be used.] Applicator for water-based
markings shall be equipped with non-stick coated hoses; metal parts in
contact with the paint material shall be constructed of grade 302, 304,
316, or equal stainless steel.
1.5.2
Reflective Media Dispenser
Attach dispenser for applying the reflective media to the paint dispenser
and operate automatically and simultaneously with the paint applicator
through the same control mechanism. Use dispenser capable of adjustment
and designed to provide uniform flow of reflective media over the full
width of the stripe at the rate of coverage specified herein at all
operating speeds of the paint applicator to which it is attached.
1.5.3
Thermoplastic Application Equipment
Application equipment shall be mobile and maneuverable to the extent that
straight lines can be followed and normal curves can be made in a true arc.
The equipment used for the placement of thermoplastic pavement markings
shall be of two general types: mobile applicator and portable applicator.
1.5.3.1
Mobile Application Equipment
The mobile applicator shall be defined as a truck-mounted, self-contained
pavement marking machine that is capable of hot applying thermoplastic by
either the extrusion or spray method. The mobile unit shall be capable of
operating continuously and of installing a minimum of 6000 mm 20,000 lineal
feet of longitudinal markings in a 8-hour day. Equip the mobile unit with
a melting kettle of such capacity as to hold a minimum of 2700 kg 6000
pounds of molten thermoplastic material. The kettle shall be capable of
heating the thermoplastic composition to temperatures of 190 to 218 degrees
C 375 to 425 degrees F. The heating mechanism shall be by means of a
thermostatically controlled heat transfer liquid. Heating of the
composition by direct flame shall not be allowed. Oil and material
temperature gages shall be visible at both ends of the kettle. [Equip the
mobile unit with a minimum of two extrusion shoes located one on each side
of the truck, and shall be capable of marking simultaneous edgeline and
centerline stripes. Each extrusion shoe shall be a closed, oil-jacketed
unit; shall hold the molten thermoplastic at a temperature of 190 to 218
degrees C 375 to 425 degrees F; and shall be capable of extruding a line of
75 to 200 mm 3 to 8 inches in width; and at a thickness of not less than 3
mm 0.125 inch nor more than 5 mm 0.190 inch, and of generally uniform cross
section.] [Equip the mobile unit with a spray gun system. The spray
system shall consist of a minimum of four spray guns, located two on each
side of the truck, and shall be capable of marking simultaneous edgeline
and centerline stripes. Surround the spray system (jacketed) with heating
oil so as to maintain the molten thermoplastic at a temperature of 190 to
218 degrees C 375 to 425 degrees F; and shall be capable of spraying a
stripe of 75 to 300 mm 3 to 12 inches in width, and in thickness varying
from 1.5 to 2.5 mm 0.055 to 0.095 inch, and of generally uniform cross
section.]
1.5.3.2
Portable Application Equipment
The portable applicator shall be defined as hand-operated equipment,
SECTION 02761N
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