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【要求】挤出型热熔反光标线涂料技术要求
2022-04-04 11:38:13   来源:中路标线

【要求】挤出型热熔反光标线涂料技术要求Extruded Thermoplastic Reflectorized Pavement Markings
Extruded Thermoplastic Reflectorized Pavement Markings

热熔挤出型标线涂料技术要求
Extruded Thermoplastic Reflectorized Pavement Markings
热熔挤出型标线涂料技术要求
热熔挤出型标线涂料技术要求

施工注意事项
CONSTRUCTION DETAILS.   
General.  All pavement markings and patterns shall be placed as shown on the Contract or Work Order
documents and in accordance with the MUTCD.
Before any pavement marking work is begun, a schedule of operations shall be submitted for
approval by the Engineer or his/her authorized representative.  At least five (5) days prior to starting
striping, the Contractor shall provide the Engineer with the preformed thermoplastic manufacturer's
written instructions for use. These instructions shall include, but not be limited to, recommended
material mixing ratios and application temperatures.  
Inspectors have the right to shut down work if any required documentation, safety requirements or
performance requirements are not met.
Material Temperatures. Extruded thermoplastic shall be applied at a temperature between 400oF and
475 oF per manufacturer requirements as measured at the extrusion shoe(s).  No extruded thermoplastic
shall be placed until a temperature within this range is attained and maintained at the extrusion shoe(s)
and use of ribbon method is not allowed.     
Work Zone Traffic Control.  When pavement markings are applied under traffic, the Contractor shall
provide all necessary flags, markers, signs, etc. in accordance with the MUTCD to maintain and protect
traffic, and to protect marking operations and the markings until thoroughly set. The application of
pavement markings shall be done in the general direction of traffic. Installation against the direction of
traffic flow shall not be allowed.
Misplaced and tracked material.  The Contractor shall be responsible for removing, to the satisfaction
of the Engineer, all tracking marks, spilled preformed thermoplastic, and preformed thermoplastic
markings applied in unauthorized areas.
Atmospheric Conditions.  Thermoplastic pavement markings shall only be applied during conditions of
dry weather and on substantially dry pavement surfaces. At the time of installation the pavement
surface temperature shall be a minimum of 55°F and the ambient temperatures shall be a minimum of
50°F and rising.    
Surface Preparation.  The Contractor shall clean the pavement and existing durable markings to the
satisfaction of the Engineer.  At the time of application, all pavement surfaces and existing durable
markings shall be free of oil, dirt, dust, grease and similar foreign materials.  A high volume air blower
shall be used to clear dust and debris from the surface for all applications to be included in the unit cost
for this item ‐ except where water blasting for surface preparation is specifically called out on the Work
Order as a payment item.  
Extruded Thermoplastic Bond Strength. Bonding between extruded thermoplastic and the pavement
shall be randomly tested using a lift‐off tester according to ASTM 4796 and D7234.  
Thermoplastic Application Equipment. Thermoplastic application equipment shall be approved by the
Engineer prior to the start of work.
Thermoplastic material shall be applied to the pavement surface 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 maintaining the temperature and controlling the flow of material.   
For heating the thermoplastic composition, the application equipment shall include a melting kettle(s) of
such capacity as to allow for continuous marking operations. The melting kettle(s) may be mounted on a
separate “supply” vehicle or included as part of the mobile application equipment.  The kettle(s) shall be
capable of heating the thermoplastic composition temperatures between 400 oF and 475 o F.  The heating
mechanism shall be by means of a thermostatically controlled heat transfer medium.  Heating of the
composition by direct flame will not be allowed. Material temperature gauges shall be visible at both
ends of the kettle(s) and at the extrusion shoe(s).
 
Application equipment shall be constructed to provide continuous mixing and agitation of the material.  
Conveying parts of the equipment between the main material reservoir and the extrusion shoe(s) shall
be so constructed as to prevent accumulation and clogging.  All parts of the equipment which come into
contact with the material shall be so constructed so as to be easily accessible and exposable for cleaning
and maintenance. The equipment shall be constructed so that all mixing and conveying parts up to and
including the extrusion shoe(s), maintain the material at the required plastic temperature.
The application equipment shall be so constructed as to insure 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 “skip” lines. The equipment shall be capable of applying varying widths of
traffic markings.
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
in such a manner that it will only dispense beads while the composition is being applied.
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.  Applicators shall be equipped and constructed in
such a manner as to satisfy the requirements of the
Mobile Application Equipment.  The mobile applicator shall be defined as a truck mounted, self‐
contained pavement marking machine that applies thermoplastic by the extrusion method. The unit
shall be equipped to apply the thermoplastic material at the widths and thicknesses specified herein.
The mobile unit shall be capable of operating continuously and of installing a minimum of 20,000 feet of
longitudinal markings in an 8–hour day.
The mobile unit shall be equipped with a melting kettle(s) or materials storage reservoir(s) of such
capacity as to allow for continuous marking operations.   
The mobile unit shall be equipped with an extrusion shoe(s), and shall be capable of marking edgeline
and centerline stripes. The extrusion shoe(s) shall be closed, heat jacketed or suitably insulated unit;
shall hold the molten thermoplastic at a temperature greater than 400°F; and shall be capable of
extruding a line between 3 to 8 inches in width; and at a thickness of not less than 1/8 inch nor more
than 3/16 inch, and of generally uniform cross section. Material temperature gauges shall be affixed or
incorporated in the extrusion shoe in such a manner as to be visible, and capable of monitoring the
composition temperature throughout the marking operation.
The mobile unit shall be equipped with an electronic and programmable line pattern control system, or
mechanical control system, so as to be capable of applying skip or solid lines in any sequence, and
through any extrusion shoe in any cycle length.
Portable Application Equipment.  The portable applicator shall be defined as hand operated equipment,
specifically designed for placing thermoplastic installations such as crosswalks; stop bars; legends;
arrows; and short lengths of lane, edge, and centerlines. The portable applicator shall be capable of
applying thermoplastic pavement markings by the extrusion method. It is intended that the portable
applicator will be loaded with hot thermoplastic composition from the melting kettle(s). The portable
applicator shall be equipped with all the necessary components, including a materials storage reservoir,
bead dispenser, extrusion shoe, and heating accessories, so as to be capable of holding the molten
thermoplastic at temperatures greater than 400°F, of extruding a line of from 3 to 8 inches in width, and
in thickness of not less than 1/8 inch nor more than 3/16 inch and of generally uniform cross– section.
Material temperature gauges shall be affixed or incorporated in the extrusion shoe in such a manner as
to be visible, and capable of monitoring the composition temperature throughout the marking
operation.
Application of Thermoplastic Reflectorized Pavement Markings.  All special markings, cross walks, stop
bars, legends, arrows, and similar patterns shall be placed with a portable applicator.  Unless otherwise
specified in the contract documents all center line, skip line, edge line and other longitudinal type
markings may be applied with either a portable or a mobile applicator.
When the surface preparation work has been completed, if applicable, the bituminous and/or concrete
pavement surface shall be primed and with a primer in accordance with the manufacturer's written
instructions.  Primer shall not be required on new bituminous pavement surfaces that are completed
within the same calendar year as the thermoplastic marking application. The primer shall be spray
applied onto the pavement surface and allowed to dry according to the manufacturer's written
instructions.  Pavement surfaces that are primed and not striped with thermoplastic within the required
drying time or within the same work day shall be re‐primed.
After the primer has dried, the thermoplastic shall be applied at composition temperatures no lower
than 400°F at the point of deposition.  Immediately after installation of the thermoplastic, drop‐on
reflective glass spheres shall be mechanically applied such that the spheres are held by and embedded
in the surface of the molten composition.   
Defective Thermoplastic Pavement Markings.  Thermoplastic reflectorized pavement markings, which
after application and setting are determined by the Engineer to be defective and not in conformance
with this specification, shall be repaired. Repair of defective markings shall be the responsibility of the
Contractor and shall be performed to the satisfaction of the Engineer as follows:
1. Insufficient glass bead coverage or inadequate glass bead retention.
Repair Method. Prepare the surface of the defective thermoplastic marking or the surface so the
application surface shall be free of oil, dirt, dust, grease and similar foreign materials. Repair
shall be made by removing and replacing the marking or by melting the surface and evenly
reapplying glass beads with a shaker.
2. Uncured or discolored thermoplastic and/or insufficient bond to pavement surface or existing
durable marking.
Repair Method. The defective thermoplastic marking shall be completely removed and cleaned
to the underlying pavement surface and re‐applied in accordance with the requirements of this
specification.  
Other defects not noted above, but determined by the Engineer to need repair, shall be repaired or
replaced as directed by and to the satisfaction of the Engineer.
All work in conjunction with the repair or replacement of defective thermoplastic reflectorized
pavement markings shall be performed at the Contractor’s expense.
Personal Protective Equipment.  Follow all exposure, respiratory and personal protective equipment
controls, handling and safety precautions and spill and disposal procedures as identified by s safety data
sheets (SDS), labels and other manufacturer’s recommendations for the products used.Extruded Thermoplastic Reflectorized Pavement Markings
 
WORK ZONE TRAFFIC CONTROL (WZTC).  The Contractor is responsible for ensuring appropriate WZTC
in compliance with the MUTCD appropriate for the dry time of the selected material applied.  The
Contractor is responsible to ensure adequate WZTC to prevent those walking, skating, bicycling, and
driving from coming into contact with applied material that is still capable of being tracked.  The
Contractor shall be liable for such tracking and property damage should it occur.  
……

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