EP1948868A1 - Feuilles optiquement actives à marque indiquant une orientation voulue - Google Patents

Feuilles optiquement actives à marque indiquant une orientation voulue

Info

Publication number
EP1948868A1
EP1948868A1 EP06815960A EP06815960A EP1948868A1 EP 1948868 A1 EP1948868 A1 EP 1948868A1 EP 06815960 A EP06815960 A EP 06815960A EP 06815960 A EP06815960 A EP 06815960A EP 1948868 A1 EP1948868 A1 EP 1948868A1
Authority
EP
European Patent Office
Prior art keywords
pavement marking
marking tape
mark
sheet
tape
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06815960A
Other languages
German (de)
English (en)
Other versions
EP1948868A4 (fr
Inventor
Paul J. Northey
David.C. May
Stephen M. Dvorsky
Michael A. Turner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Innovative Properties Co
Original Assignee
3M Innovative Properties Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 3M Innovative Properties Co filed Critical 3M Innovative Properties Co
Publication of EP1948868A1 publication Critical patent/EP1948868A1/fr
Publication of EP1948868A4 publication Critical patent/EP1948868A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
    • E01F9/50—Road surface markings; Kerbs or road edgings, specially adapted for alerting road users
    • E01F9/576—Traffic lines
    • E01F9/578—Traffic lines consisting of preformed elements, e.g. tapes, block-type elements specially designed or arranged to make up a traffic line

Definitions

  • Pavement marking tapes are typically used to delineate the boundaries for lanes of traffic on a roadway.
  • the tape may extend continuously, such as along the outermost boundaries of the driving lanes, or intermittently, such as between lanes.
  • One popular use for such a tape is in construction work zones, where pavement marking tape can guide motorists through new traffic patterns without incident.
  • Various embodiments of the present invention relate to optically active pavement marking tapes, optically active sheets and strips, and methods of making and using each.
  • an optically active material includes a mark formed on or through the optically active material to facilitate identification of a preferred application orientation of the material. Further, the mark does not significantly affect the optical properties of the optically active material.
  • the optically active material may be, for example, a pavement marking tape or reflective sheeting.
  • the mark may be, for example, embossed onto or cut into the sheet to form an alphanumeric symbol, an arrow, a directional indicator, or a score mark. Further, the mark may comprise the shape of the sheet or may have a color that differs from the color of the sheet.
  • One method of applying a sheet of optically active pavement marking tape having a mark formed thereon and/or involves: (1) providing a piece of pavement marking tape; (2) detecting an application orientation indicating mark formed on or through at least a portion of the piece of pavement marking tape; (3) orienting the piece of pavement marking tape on the desired surface in accordance with the mark; and (4) applying the piece of pavement marking tape to the desired surface.
  • the optically active material is wound to form a roll, and each roll includes multiple individual sheets or strips of pavement marking tape.
  • Each sheet or strip is separated from an adjacent sheet or strip by a separation line.
  • the separation line extends along the width of each sheet or strip.
  • the separation line may include, for example, a plurality of perforations, cuts, slits, or variegated holes that partially separate adjacent sheets or strips. Alternatively, the separation line may be a cut that completely separates adjacent sheets or strips from one another.
  • Fig. 1 is a pictorial view of a strip of pavement marking tape having a shape that forms a mark indicating a preferred application orientation of the strip of pavement marking tape;
  • Figs. 2-4 are enlarged pictorial views of a portion of three separate exemplary strips of pavement marking tape onto or through each which has been formed a mark in the form of an arrow that indicates a preferred application orientation of the strip of pavement marking tape;
  • Figs. 5-7 are pictorial views of a portion of three separate exemplary strips of pavement marking tape onto or through each of which has been formed a mark that indicates a preferred application orientation of the strip of pavement marking tape;
  • Figs. 8 and 9 are pictorial views of the opposite ends of two exemplary strips of pavement marking tape each of which includes a mark that indicates a preferred application orientation of the strip of pavement marking tape;
  • Fig. 10 is a pictorial view of a roll of pavement marking tape including multiple sheets of tape that are each completely separated from an adjacent sheet of tape along a separation line
  • Fig. 11 is pictorial view of a roll of pavement marking tape including multiple sheets of tape that are each separated from an adjacent sheet of tape by a perforated separation line
  • Figs. 12-14 are pictorial views showing various exemplary patterns for the perforated separation line.
  • the present patent application describes more expedient and accurate methods of applying an optically active material, e.g., pavement marking tape or sheeting, to a desired substrate or surface such that the pavement marking tape is applied to the desired surface in a preferred orientation, e.g., with the brightest portion of the pavement marking tape facing the driver.
  • an optically active material e.g., pavement marking tape or sheeting
  • One exemplary optically active material for use in practicing these methods includes an application orientation indicating mark that indicates the orientation in which the optically active material should be applied to the desired surface.
  • the present patent application further describes more expedient and accurate methods of preparing an optically active material, e.g., pavement marking tape, to be applied to a desired surface.
  • An exemplary pavement marking tape is wound in a roll that includes multiple, individual sheets of pre-measured tape that are separated from an adjacent sheet by a separation line and that can be quickly and easily removed from the roll and applied to the desired surface.
  • the methods of the present invention are useful for preparing and using optically active materials to create roadside signage and pavement markings.
  • the above-described methods, and the optically active materials for use in practicing the methods are more accurate and reliable than previous methods and materials because they minimize reliance on human assessment or measurement of the optically active materials.
  • the application of optically active materials to a desired surface currently requires the person applying the material to (1) determine the preferred application orientation of the optically active material and (2) to measure and cut the optically active material. This reliance on human assessment and measurement introduces the potential for error to occur.
  • pavement marking tape includes any optically active material, including, but not limited to, reflective and retroreflective sheeting.
  • sheet and “strip” are used interchangeably to refer to a piece of pavement marking tape that can be applied to a desired surface.
  • the composition of an exemplary pavement marking tape comprises ceramic fibers dispersed within a polymeric material.
  • the pavement marking composition may further comprise other fibers, and in particular non- thermoplastic organic fibers such as polyester fibers, polyolefin fibers, and mixtures thereof.
  • Fillers may also be included in the composition at least for the purpose of enhancing the visibility of the exposed top layer. However, fillers may also advantageously enhance properties such as reinforcement, extending, surface hardness, and abrasion resistance.
  • Pavement marking sheeting or tape may include a pressure sensitive adhesive for bonding the sheet to a roadway surface.
  • the initial coefficient of retroreflected luminance (RL) of some preferred pavement markings is at least 1000 millicandelas/lux/m2.
  • the initial coefficient of retroreflected luminance, RL may be at least 1500 millicandelas/lux/m2, at least 1800 millicandelas/lux/m.2, at least 2000 millicandelas/lux/m2, at least about 2200 millicandelas/lux/m2, at least 2500 millicandelas/lux/m2, or greater.
  • some preferred pavement marking materials have a water vapor transmission rate (WVTR) of at least 2 g/m 2 /day according to ASTM F 1249.
  • Exemplary commercially available pavement marking tapes include those manufactured by 3M of St. Paul, Minnesota.
  • Pavement Marking Tape Including a Mark Indicating a Preferred Application Orientation
  • a desired surface e.g., roadway or pavement
  • the preferred orientation is not always immediately visible, so hurried workmen often affix the pavement marking tape to the pavement in the incorrect orientation.
  • retroreflective pavement marking tape are approximately 15% brighter when viewed from one direction than from the other direction, incorrect placement may result in a significant decrease or increase in expected brightness.
  • pavement marking tape applied to the pavement such that the portion of the pavement marking tape having enhanced brightness will be viewed by a driver (i.e., the view of highest brightness faces the driver). In some instances, it may be desirable to have the portion of the pavement marking tape having decreased brightness viewed by the driver (i.e., the view of lower brightness faces the driver).
  • the present inventors recognized that there is currently no quick and easy application method to ensure and verify that the pavement marking tapes are applied to the desired substrate in the desired orientation. It may thus be desirable to form a pavement marking tape having an application orientation indicating mark that indicates a preferred application orientation without significantly negatively affecting an optical property of the pavement marking tape. While any type of an application orientation indicating mark falls within the scope of the invention, some exemplary marks are shown in Figs. 1-9. These an application orientation indicating marks may be formed on either or both of the viewing or non- viewing surface of the pavement marking tape.
  • the diamond pattern on the strips shown in Figs. 1-4 indicates that these strips are retroreflective.
  • Commercially available retroreflective pavement marking strips having a diamond pattern are manufactured by 3 M of St. Paul, Minnesota and sold under the trade name StamarkTM.
  • strip 10 As shown in Fig. 1, the shape of a strip 10 of retroreflective pavement marking tape forms an application orientation indicating mark indicating a preferred application orientation of strip 10.
  • Strip 10 includes a front side 12, a rear side 14, and opposed first and second side margins 16 and 18.
  • Strip 10 has the general shape of an arrow. Specifically, strip 10 has a generally convexo-concave shape that includes a v-shaped front side 12 that forms a first point 22 and a negatively v-shaped rear side 14 that forms a second point 24.
  • Alternative generally arrow shaped strips 10 may have rounded front 12 and rear 14 sides that form convexo-concave and concavo-convex pavement marking strips 10.
  • one of front 12 and rear 14 sides is shaped and the other is substantially linear.
  • first side 12 may be v-shaped to form a first point 22 and rear side 14 may be linear.
  • a directional application orientation indicating mark 30, such as an arrow may be embossed or cut into a strip 32 of pavement marking material using embossing and cutting methods known to those of skill in the art.
  • the shape, location, size, frequency, pattern, and color of directional mark 30 may vary based on the thickness, color, sheet material, desired end use, etc., of strip 32 of pavement marking tape.
  • a single hole formed adjacent to one of front and rear sides 12 and 14 may act as a directional application orientation indicating mark. Taking these factors into consideration, a strip having the end-user's desired properties can be formed.
  • the alternative embodiments of exemplary pavement markings tapes shown in Figs. 1-4 can be applied to the center, middle, or sides of a road.
  • Figs. 5-7 show alternative embodiments of pavement marking tape strips that are well suited for application to the side of a road.
  • Fig. 5 shows a portion of a strip 40 of pavement marking tape having score marks 42 embossed or cut onto or into one of first and second opposed side margins 16 and 18.
  • the workmen affixing strip 40 to the pavement can be instructed to affix strip 40 such that score mark 42 is adjacent to or points toward the ditch or can be instructed to affix strip 40 such that score mark 42 is on the opposite side of the ditch.
  • Score marks 42 shown in Fig. 5 are uniformly spaced and have a uniform size and length, however, these are only exemplary and those of skill in the art will recognize that any type of score mark may be used and still fall within the scope of the present invention.
  • Fig. 6 shows a portion of a strip 50 of pavement marking tape onto which has been formed a word 52 that indicates a preferred application orientation of strip 50.
  • the word may be formed onto strip 50 in any manner known to those of skill in the art, including embossing and cutting.
  • the word may be formed on either of first and second opposed * side margins 16 and 18.
  • the word specifically shown in Fig. 6 is DITCH, but any word, combination of characters, single character, portion of a work, symbol, or alphanumeric character can be used.
  • An exemplary preferred application of strip 50 would involve affixing strip 50 on the pavement such that the word DITCH was adjacent to the ditch portion of the road.
  • Alternative exemplary embodiments would include the word ROAD or some other indication thereof on the opposed side margin of strip 50.
  • Fig. 7 shows a portion of a strip 60 of pavement marking tape onto which has been formed a symbol 62 that forms an application orientation indicating mark that indicates a preferred application orientation of strip 60.
  • the symbol may be formed onto strip 60 in any manner known to those of skill in the art, including embossing and cutting.
  • the symbol may be formed on either of first and second opposed side margins 16 and 18 of strip 60.
  • the workmen affixing strip 60 to the pavement can be instructed to affix strip 60 such that symbol 62 is adjacent to or points toward the ditch or can be instructed to affix strip 60 such that symbol 62 is on the opposite side of the ditch.
  • the X symbols 62 shown in Fig. 7 are uniformly spaced and have a uniform size, however, these are only exemplary and those of skill in the art will recognize that any type of symbol having any size, pattern, and frequency may be used and still fall within the scope of the present invention.
  • Figs. 8 and 9 show exemplary pavement markings tape strips that can be applied to the center, middle, or sides of a road.
  • the middle portion of the strips shown in Figs. 8 and 9 has been cutaway and only front 12 and rear 14 ends of each strip are shown.
  • Strip 80 shown in Fig. 8 includes an alphanumeric character on each of front 12 and rear 14 ends.
  • the alphanumeric character is preferably chosen to indicate the preferred application orientation of strip 80.
  • the alphanumeric character on front end 12 of strip 80 is an "F" indicating that it is adjacent the front end 12 of strip 80 and the alphanumeric character on the rear end 14 of strip 80 is an "R" indicating that it is adjacent the rear 14 of strip 80.
  • Those of skill in the art will appreciate that any alphanumeric character or other indicator may be used to indicate the preferred application orientation.
  • Strip 90 of Fig. 9 includes multiple arrows formed onto the front and rear sides 12 and 14 of strip 90 by, for example, cutting or embossing. As stated above with respect to other alternative embodiments, these arrows may have any preferred size, shape, color, texture, and thickness that is desired.
  • the shape of the pavement marking tape strip is visible to the person affixing the strip to the pavement but is not readily visible to a driver casually glancing at the strips as they drive past.
  • One such exemplary embodiment involves the application of color to at least one edge, e.g., to the front or back side margin, of a strip of pavement marking tape. Differentiating a side margin or side wall surface of a sheet or strip of pavement marking tape by applying a color to that side margin or side wall surface forms an application orientation indicating mark that would facilitate correct application of the sheet or strip of the pavement marking tape.
  • the colored side margin or side wall surface might not be visible to a driver on the roadway.
  • the color could be applied in any way known to those of skill in the art and could be applied at any time, including during manufacturing of the tape or while applying the tape. Further, embossed or otherwise raised or lowered marks may wear off during normal use of the pavement marking tape and thus may not be visible to drivers on the roadway and may be visible to the people applying the tape to the desired surface only during application.
  • Pavement marking tape is typically transported in a large, continuous roll.
  • a popular method for preparing and applying pavement marking tape skip dashes involves two or more workmen unwinding the pavement marking tape from the roll, placing the unwound portion of the tape onto a board, measuring the desired length of tape, and then hand-cutting the tape to the desired length. Stacks of these hand- cut pieces of pavement marking tape are then transported to the application site.
  • an optically active material can be wound to form a roll that includes multiple individual sheets or strips of pavement marking material wherein each sheet or strip is separated from an adjacent sheet or strip by a separation line.
  • the separation line may include, for example, a plurality of perforations, cuts, slits, or variegated holes that partially separate adjacent sheets.
  • the separation line may be a cut that completely separates adjacent sheets from one another.
  • a roll 100 of pavement marking tape includes multiple, individual, sheets 102 of pavement marking tape arranged end-to-end. Adjacent sheets 102 are separated by a separation line 104, which can be, for example, a perforated separation line 104 p as shown in Fig. 11 or a complete cut 104 c that fully separates adjacent sheets 102 as shown in Fig. 10. Separation line 104 facilitates quick, easy, and accurate removal of individual sheets 102 from roll 100.
  • Pavement marking tape includes a first optically active major surface 110 and an opposed second major surface 112.
  • roll 100 may be wound such that optically active first major surface 110 faces outwardly of or away from the center of roll 100, and second major surface 112 faces inwardly of or toward the center of roll 100.
  • optically active first major surface 110 may face inwardly of or toward the center of roll 100 and second major surface 112 may face outwardly of or away from the center of roll 100.
  • Roll 100 may be wound and otherwise formed by conventional methods.
  • Roll 100 is not shown as including a core or any support material, but roll 100 may optionally include a core wherein the multiple sheets 102 of pavement marking tape are wrapped/wound around the core. Roll 100 may optionally include a liner interposed between each or some of the multiple wraps of pavement marking tape. Each sheet 102 in roll 100 has a length L and a width W. Width W of each sheet
  • Length L of each sheet 102 is determined by the distance between adjacent separation lines 104 and can be tailored to the specifications of the end-user. However, a preferred length L is between about 5 feet and about 20 feet, more preferably between about 10 feet and about 15 feet.
  • some embodiments of roll 100 include adjacent sheets 102 separated by a transverse, perforated separation line 104 p .
  • the use of perforated separation lines 104 p is well known in the field of paper, tissue, and towels.
  • U.S. Patent No. 5,704,566 discloses a roll of paper towels that may be separated into toweling segments by pulling the paper towels along a perforated tear line.
  • Perforated separation line 104 p includes multiple slits, cuts, or holes that are separated from an adjacent slit, cut, or hole by sheet material, which is herein referred to as a bonded area 120.
  • the number of slits, cuts, or holes in any perforated separation line 104 p will depend on a variety of factors including the width W of each sheet 102; the size ⁇ e.g., length and diameter) of each slit, cut, or hole; the type of material used to form sheet 102; and the intended use for sheet 102.
  • each perforated separation line 104 p can be determined by one of skill in the art taking into consideration the above-identified factors.
  • Perforated separation lines 104 p are formed using commonly known techniques and machines. Perforated separation line 104 p can be formed before the pavement marking tape is rolled onto roll 100 or can be formed after roll 100 has been wound.
  • Perforated separation lines 104 p between sheets 102 may be formed at regular intervals to allow the user to remove a pre-defined, pre-measured, length L of pavement marking tape and to easily separate that strip of tape from roll 100.
  • perforated separation lines 104 p on sheets 102 may be formed at random or irregular intervals.
  • perforated separation line 104 p While any type of perforated separation line 104 p falls within the scope of the invention, some exemplary perforated separation lines 104 p are shown in Figs. 12-14.
  • Figs. 11 and 12 show a perforated separation line 104 p including a plurality of cuts or slits 122.
  • the portions of pavement marking tape shown in Figs. 11 and 12 have approximately equal length slits 122.
  • slits 122 are longer toward the side edges 124 and 126 of sheet 102 than in the middle. This formation of perforated separation line 104 p facilitates tearing of sheet 102 from roll 100.
  • Fig. 13 shows a perforated separation line 104 p including multiple variegated holes 130 formed in sheet 102.
  • the diameter of each variegated hole 130 may be generally uniform, as shown in Fig. 13, or may be variable. In an alternative embodiment (not shown), the diameter of variegated holes 130 increases toward the edges 124 and 126 of sheet 102 to facilitate tearing of sheet 102 from roll 100.
  • Fig. 14 shows a perforated separation line 104 p including a combination of slits 122 and variegated holes 130.
  • the length, diameter, pattern, and spacing of slits 122 and holes 130 can be variable or regular.
  • the user is preferably able to readily visually identify the location of perforated separation line 104 p in sheet 102.
  • the visibility of perforated separation line 104 p is related to the length of each slit 122, cut, or hole 130 in sheet 102.
  • Slits 122, cuts, or holes 130 having a size that provides easy recognition by the user may be preferred in some embodiments. However, if the slits 122, cuts, or holes 130 are too large, the strength of bonded area 120 suffers and roll 100 is weaker because the size of bonded area 120 is minimized. In addition to other factors such as the type of sheet material, the ratio of perforated area to bonded area 120 affects a perforation detach strength characteristic of sheet 102.
  • the perforation detach strength characteristic can be controlled to meet an end user's specifications, as will be readily understood by one of skill in the art. Because roll 100 may differ in sheet material, sheet thickness, perforation detach strength, number of wraps, etc., it is desirable to consider these competing interests when forming each roll 100.
  • One method of separating one individual sheet 102 from the immediately adjacent sheet 102 on roll 100 involves the following steps: (1) the user unrolls or unwinds the desired sheet 102 from roll 100 so that the desired sheet is freely hanging from roll 100; and (2) the user then tugs, pulls, or tears the freely hanging sheet 102 from the adjacent sheet 102 on roll 100 while controlling the rotation of roll 100, for example, with the other hand.
  • One advantage of the above-described methods and sheets is that the measuring and cutting of the sheets is more accurate since there is less reliance on human measurement and cutting to effect sheet separation. This results in an increase in ease with which individual sheets may be separated from one another and an increased efficiency with which the sheets may be applied to the desired surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Signs Or Road Markings (AREA)
  • Road Repair (AREA)

Abstract

Cette invention concerne, dans un mode de réalisation donné à titre d’exemple, un matériau optiquement actif comprenant une marque qui facilite l’identification d’une orientation d’application voulue du matériau sans incidence notable sur ses propriétés optiques. Dans un autre mode de réalisation donné à titre d’exemple, un matériau optiquement actif est enroulé en un rouleau comprenant plusieurs rubans distincts d’une bande prémesurée. Des rubans adjacents sont séparés par une ligne de séparation pouvant être, par exemple, perforée ou une découpe totale qui sépare complètement les rubans adjacents.
EP06815960.7A 2005-10-05 2006-10-03 Feuilles optiquement actives à marque indiquant une orientation voulue Withdrawn EP1948868A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/243,715 US20070077119A1 (en) 2005-10-05 2005-10-05 Optically active sheets including a mark indicating a preferred sheet orientation
PCT/US2006/038337 WO2007041445A1 (fr) 2005-10-05 2006-10-03 Feuilles optiquement actives à marque indiquant une orientation voulue

Publications (2)

Publication Number Publication Date
EP1948868A1 true EP1948868A1 (fr) 2008-07-30
EP1948868A4 EP1948868A4 (fr) 2013-11-27

Family

ID=37902108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06815960.7A Withdrawn EP1948868A4 (fr) 2005-10-05 2006-10-03 Feuilles optiquement actives à marque indiquant une orientation voulue

Country Status (3)

Country Link
US (1) US20070077119A1 (fr)
EP (1) EP1948868A4 (fr)
WO (1) WO2007041445A1 (fr)

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EP1948868A4 (fr) 2013-11-27
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