The Thermoplastic Process...
|Thermoplastic applied to the roadway by Traffic Lines, Inc.|
Hot applied thermoplastics are the preferred durable pavement marking system.
Thermoplastic Striping: requires no primer/sealer when applied to PCC or aged asphalt surfaces. This highly reflective, long-lived, solvent-free pavement marking material is highly resistant to cracking from freeze/thaw cycles, and it exhibits extremely aggressive bonding characteristics. Thermoplastic is a special blend of binders/resins which are impervious to the effects of oil and grease, pigment, filler and glass reflectorizing spheres.
I. Surface preparation:
a) Existing striped asphalt or concrete roadways.
1. Existing markings must be a single coat of no more than 30 mils initially. Any size larger than 30 mils will make it difficult for the new material to bond correctly.
2. Existing markings must not have flaking or chipping.
If you have existing temporary markings down, it is not necessary to remove them as long as the markings follow the guidelines above.
If you have existing paint, epoxy, polyester, or tape pavement markings, they must be removed at least by 90% to provide adequate bonding. Removal of existing thermoplastc is required. Existing road markings can be removed by grinding, shot blasting, or in the case of tape, pulling up by hand.
b) Unmarked concrete or asphalt roadways.
1. All surfaces must be dry and free of any loose debris.
2. New Concrete must be allowed to cure at least 14 days, and must be mechanically abraded to remove any curing compounds or surface film.
3. New Asphalt can be striped with thermoplastic pavement markings 24 hours after the final roll is completed. It is recommended that a new asphalt roadway not be striped until all construction is complete and the roadway has at least 7 days of traffic flow. This allows any oils, roller aids, or other "liquid" surface coatings to be tracked off the road surface. Having the roadway free of these debris items will allow for a better bond and a longer lasting line. Waiting also helps prevent any of these oils, dirt, etc. from being tracked or deposited onto the new thermoplastic markings making them less bright and reflective.
1. Primer application: primer must be applied to the surfaces that are to be marked.
2. The material must be in a molten state for proper bonding to the surface.
3. Glass beads must be dropped immediately into the thermoplastic to provide reflectivity. These glass beads provide night time reflectivity so as to make the traffic markings easier for the motorists to see at night.
Thermoplastic can be applied through spray and ribbon/extrude. Thermoplastic properly bonds to substrates at temperatures between 400-440 degrees F. Thickness is variable. Both the pavement surface and ambient air temperature must be at least 50 - 55 degrees F prior to striping. This should be checked at least hourly when weather conditions cause temperatures to drop during the course of the striping operation. Note: The drying time will be increased when striping at low temperatures.
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