All machines, tools, and equipment used in performance of the work shall be
approved and maintained in satisfactory operating condition. Hand-operated
push-type machines of a type commonly used for application of paint to
pavement surfaces will be acceptable for marking small streets and parking
areas. Applicator machine shall be equipped with the necessary paint tanks
and spraying nozzles, and shall be capable of applying paint uniformly at
coverage specified. Sandblasting equipment shall be provided as required
for cleaning surfaces to be painted. Hand-operated spray guns shall be
provided for use in areas where push-type machines cannot be used.
1.5.2
Thermoplastic Application Equipment
1.5.2.1
Thermoplastic Material
Thermoplastic material shall be applied to the primed pavement surface by
spray techniques or by the extrusion method, wherein one side of the
shaping die is the pavement and the other three sides are contained by, or
are part of, suitable equipment for heating and controlling the flow of
material. By either method, the markings shall be applied with equipment
that is capable of providing continuous uniformity in the dimensions of the
stripe.
1.5.2.2
Application Equipment
a. Application equipment shall provide continuous mixing and agitation
of the material. Conveying parts of the equipment between the main
material reservoir and the extrusion shoe or spray gun shall prevent
accumulation and clogging. All parts of the equipment which come into
contact with the material shall be easily accessible and exposable for
cleaning and maintenance. All mixing and conveying parts up to and
including the extrusion shoes and spray guns shall maintain the
material at the required temperature with heat-transfer oil or
electrical-element-controlled heat.
b. The application equipment shall be constructed to ensure continuous
uniformity in the dimensions of the stripe. The applicator shall
provide a means for cleanly cutting off stripe ends squarely and shall
provide a method of applying "skiplines". The equipment shall be
capable of applying varying widths of traffic markings.
c. The applicator shall be equipped with a drop-on type bead dispenser
capable of uniformly dispensing reflective glass spheres at controlled
rates of flow. The bead dispenser shall be automatically operated and
shall begin flow prior to the flow of composition to assure that the
strip is fully reflectorized.
1.5.2.3
Mobile and Maneuverable
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.
a. 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 unit shall be equipped to apply the thermoplastic
marking material at temperatures exceeding 190 degrees C 375 degrees F,
at widths varying from 75 to 300 mm 3 to 12 inches and in thicknesses
SECTION 02763A
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