EP0237315A2 - Allwetter-taugliche Strassenmarkierungsmaterialbahn - Google Patents

Allwetter-taugliche Strassenmarkierungsmaterialbahn Download PDF

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Publication number
EP0237315A2
EP0237315A2 EP87302019A EP87302019A EP0237315A2 EP 0237315 A2 EP0237315 A2 EP 0237315A2 EP 87302019 A EP87302019 A EP 87302019A EP 87302019 A EP87302019 A EP 87302019A EP 0237315 A2 EP0237315 A2 EP 0237315A2
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EP
European Patent Office
Prior art keywords
base sheet
glass microspheres
sheet
pavement marking
base
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.)
Granted
Application number
EP87302019A
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English (en)
French (fr)
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EP0237315A3 (en
EP0237315B1 (de
Inventor
Yuji Ishihara
Koichi Ijichi
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.)
Seibu Polymer Kasei KK
Original Assignee
Seibu Polymer Kasei KK
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.)
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Publication date
Application filed by Seibu Polymer Kasei KK filed Critical Seibu Polymer Kasei KK
Priority to AT87302019T priority Critical patent/ATE66983T1/de
Publication of EP0237315A2 publication Critical patent/EP0237315A2/de
Publication of EP0237315A3 publication Critical patent/EP0237315A3/en
Application granted granted Critical
Publication of EP0237315B1 publication Critical patent/EP0237315B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E01F9/506—Road surface markings; Kerbs or road edgings, specially adapted for alerting road users characterised by the road surface marking material, e.g. comprising additives for improving friction or reflectivity; Methods of forming, installing or applying markings in, on or to road surfaces
    • E01F9/512—Preformed road surface markings, e.g. of sheet material; Methods of applying preformed markings

Definitions

  • This invention relates to a pavement marking sheet material and, more particularly, to an all-weather type pavement marking sheet material having an excellent visibility during night and particularly when it is raining.
  • Pavement marking materials which are presently used for pavement marking purposes all have glass microspheres dispersed on the surface thereof or mixed in the material for affording visibility during night. These pavement marking materials have the common disadvantage that, when the surface of the marking material is covered with a film of water when it is raining, upper hemisphere portions of the glass microspheres exposed above the surface of the marking material and performing a light reflecting function are mostly submerged in the water film with a result that the light reflecting function is impaired and visibility during night when it is raining becomes extremely poor.
  • Japanese Patent Publication No. 29060/1970 discloses a glass microspheres marking material comprising glass microspheres of low refractive index below 1.55 and colored or uncolored glass microspheres of medium refractive index of 1.65 - 1.85 of 10% - 60% in weight percent mixed together and further comprising adhesive mixed in these glass microspheres.
  • Japanese Patent Publication No. 48735/1977 discloses an all-weather type pavement marking material which comprises glass microspheres having refractive index of 1.55 or less and glass microspheres having a high refractive index of 2.0 - 2.3 mixed together or on which such glass microspheres having refractive index of 1.55 or less and those having refractive index of 2.0 - 2.3 are dispersed on the surface of the marking material substantially simultaneously when the marking material is applied on the pavement.
  • 9460/1978 discloses a method of applying an all-weather type pavement marking line according to which, in dispersing glass microspheres on a coated surface of a pavement marking material by flowing glass microspheres onto the pavement marking material, there are provided a surface on which glass microspheres having refractive index of 1.6 or less are dispersed and a surface on which glass microspheres having refractive index of 1.9 or more are dispersed, both surfaces being provided in the form of a belt extending in the longitudinal direction of the pavement marking material.
  • 9461/1978 discloses a method of applying an all-weather type pavement marking line according to which, in dispersing glass microspheres for light-reflection during night on an undried coated surface of a pavemet marking material, 10% - 60% in weight percent of the glass microspheres to be dispersed consists of high refractive glass microspheres having refractive index of 1.9 or more and the rest of the glass microspheres consists of low refractive glass microspheres having refractive index of 1.6 or less and these two kinds of glass microspheres are dispersed one after the other on the entire surface of the coated surface of the marking material.
  • Japanese Preliminary Patent Publication No. 238505/1985 discloses a pavement marking sheet material which is a pavement marking material preformed in the form of a sheet and is bonded on the pavement surface in use.
  • a surface sheet of a thickness of 1 mm or less consisting of a base layer in which reflex-­reflecting elements such as glass microspheres are disposed on the surface thereof and a transparent and flat surface layer covering the base laer is bonded to the entire surface or a part of the surface of a base sheet of a thickness of 3 mm or less made of a material having an excellent conformability to the pavement surface selected from materials such as rubber, synthetic resin and the like.
  • This pavement marking sheet material is intended to maintain good visibilty during night when it is raining by reflection of light by the reflex-reflecting elements covered with the cover layer while holding the total thickness of the sheet material at 4 mm or less.
  • the pavement marking methods disclosed in the above describved Japanese Patent Publications No. 29060/1970, No. 48735/1977, No. 9460/1978 and No. 9461/1978 according to which glass microspheres are bonded directly on the pavement surface with traffic paint require a strict temperature control in applying the material on the pavement surface and, in addition, require a complicated apparatus and the speed of application is rather slow.
  • the pavement marking sheet material disclosed in the above described Japanese Preliminary Patent Publication No. 238505/1985 realizes a simplified application as compared with the above described pavement marking methods since the material is preformed in the form of a sheet. This pavement marking sheet material, however, requires an extra manufacturing step for adhereing two kinds of sheets produced separately together with a resulting high manufacturing cost.
  • an object of the invention to provide an all-weather type pavement marking sheet material having an excellent visibility during night when it is raining which can be applied on the pavement surface more easily and quickly and can be manufactured at a reduced cost.
  • the pavement marking sheet material achieving the above described object of the invention is characterized in that it comprises a base sheet made of rubber, synthetic resin or the like, and glass microspheres having refractive index of 1.5 - 1.9 and glass microspheres having refractive index of 2.0 - 2.4 embedded mixedly and at least partially in a portion of the base sheet, said portion being formed at intervals in the longitudinal direction of the base sheet or continuously in the longitudinal direction of the base sheet in a part of the base sheet as viewed in the transverse direction of the base sheet.
  • the portion in which the glass microspheres having refractive index of 2.0 - 2.4 which can maintain reflex-reflectivity during night even if they are covered with a water film due to rain are embedded in the base sheet is provided at intervals in the longitudinal direction of the base sheet or continuously in the longitudinal direction of the base sheet in a part of the base sheet as viewed in the transverse direction of the base sheet, this portion has an excellent visibility during night when it is raining and, accordingly, drivers of automobiles can readily recognize the pavement marking sheet material in such weather condition if the pavement marking sheet material is used as, e.g., a center line of the pavement.
  • the glass microspheres having refractive index of 1.5 - 1.9 contribute to brightness in reflection in addition to the glass microspheres having refractive index of 2.0 - 2.4.
  • the pavement marking sheet material according to the invention is so constructed that the two different kinds of glass microspheres are dispersed on the preformed base sheet, the strict temperature control and the complicated applicating appratus as required in applying the prior art pavement marking methods causing the glass microspheres to be bonded directly on the pavement surface can be obviated and the application work can be done with a remarkably increased speed.
  • the two different kinds of microspheres are dispersed not in a state in which the two kinds of microspheres are superposed one upon the other or in paralle to each other as has been proposed in the prior art methods but in such a manner that the high refractive glass microspheres which are relatively expensive are dispersed at intervals in the longitudinal direction of the base sheet or dispersed continuously in the longitudinal direction of the base sheet in a part of the base sheet as viewed in the transverse direction of the base sheet.
  • This contributes greatly to reduction in the manufacturing cost of the pavement marking sheet material without sacrificing brightness in reflection during night when it is raining.
  • the pavement marking sheet material according to the invention does not require such separate production of the two kinds of sheets so that the sheet material can be manufactured at a reduced cost.
  • the glass microspheres having refractive index of 1.5 - 1.9 used in the sheet material of the present invention have a diameter of 50 ⁇ m - 1,000 ⁇ m, preferably 100 ⁇ m - 500 ⁇ m (average diameter of 350 ⁇ m). If the diameter is less than 50 ⁇ m, the glass microspheres will be embedded too deeply in the base sheet in the embossing step with resulting decrease in brightness of reflection and, besides, they will tend to be readily covered with a water film when it rains with resulting decrease in brightness in reflection. If, on the other hand, the diameter exceeds 1,000 ⁇ m, the base sheet tends to be injured by the embedded glass micro­spheres so that such diameter is undesirable.
  • the glass microspheres having refractive index of 2.0 - 2.4 (here­inafter referred to as "glass microspheres B") have a diameter of 50 ⁇ m - 350 ⁇ m (average diameter of 70 ⁇ m). If the diameter is less than 50 ⁇ m, the glass microspheres will be embedded too deeply in the base sheet in the embossing step whereas if the diameter exceeds 350 ⁇ m, they will be too expensive to allow a commercial use in such sheet material.
  • the glass microspheres A should preferably be dispersed uniformly and continuously over the entire surface of the base sheet. If, however, an adequate brightness in reflection is obtainable owing to conditions of the pavement, the glass microspheres A may be partially dispersed at intervals in the longitudinal direction of the base sheet or may be continuously dispersed in the longitudinal direction of the base sheet in a part of the base sheet as viewed in the transverse direction of the base sheet.
  • the glass microspheres B are dispersed not uniformly over the entire surface of the base sheet but at intervals in the longitudinal direction of the base sheet or, alternatively, continuously in the logitudinal direction of the base sheet in a part of the base sheet as viewed in the transverse direction of the base sheet.
  • a portion S in which both the glass microspheres A and B exist may be disposed in various manners such, for example, as in the form of a belt-like section extending normally to the longitudinal direction of the base sheet as shown in Fig. 2, as in the form of a belt-like section extending obliquely with respect to the longi­tudinal direction of the base sheet as shown in Fig. 3, as in the form of a broken line in the longitudinal direction of the base sheet as shown in Fig. 4 and as in the form of a belt extending continuously in the longitudinal direction of the base sheet in a part of the base sheet as viewed in the transverse direction of the base sheet as shown in Fig. 5.
  • width and interval of the portion S in which both the glass micro­spheres A and B exist.
  • the width and interval of the portion S may be suitably determined so that a sufficeint brightness in reflection may be obtained depending upon conditions of the pavement on which the pavement marking sheet material is applied.
  • Preferable ratios of dispersion of the glass microspheres A and B in the portion S in which the glass microspheres A and B coexist are ones in which the glass microspheres A are dispersed over 30% - 40% of the area of a flat sheet before embossing and the glass microspheres B are dispersed over 50% - 85% (preferably 70% - 80%) of the area of the flat sheet before embossing remaining after the glass microspheres A have been dispersed. If the amount of dispersion of the glass microspheres A is less than 30%, a sufficient brightness in reflection cannot be obtained whereas if the amount of dispersion of the glass microspheres A exceeds 40%, vehicles running over the pavement marking sheet material tend to slip and therefore is undesirable. If the amount of dispersion of the glass microspheres B is less than 50%, a sufficient brightness in reflection cannot be obtained whereas the amount of dispersion of 85% is considered to be a maximum possible value of dispersion.
  • the base sheet requires to be made of a material having excellent conformability to the irregular pavement surface and durability to various mechanical forces.
  • the base sheet therefore comprises, as its main ingredient, unvulcanized synthetic rubber such, for example, as acrilonitrile-butadiene rubber (NBR), isobutylene-isoprene rubber (IIR), chloroprene rubber (CR), chloro-sulphonyl-polyethylene, a urethane rubber or a synthetic resin such, for example, as polyvinyl chloride.
  • the base sheet may comprise, if necessary, additives including a filler such as calcium carbonate powder, a pigment for providing color to the base sheet, small glass microspheres and wear resisting particles.
  • the mixture of these ingredients is formed into a sheet with a thickness of 5 mm or less by passing it through pressure rolls or by other convenient methods. If the small glass microspheres are mixed in the base sheet, small glass microspheres having a diameter not exceeding about 500 ⁇ m may be employed and those of about 70 ⁇ m - 100 ⁇ m in average diameter may be conveniently employed.
  • a release paper is normally attached to the lower surface of the adhesive layer but it may be omitted depending upon the type of the adhesive employed in the adhesive layer.
  • the unvulcanized synthetic rubber or synthetic resin which is an ingredient of the base sheet is added with desired amount of the filler, pigment, small glass microspheres and other materials if required.
  • the mixture is blended and is formed into a sheet of a thickness of 5 mm or less through heated pressure rolls and then is wound into a roll. If necessary, the roll of the base sheet is unwound and an adhesive coated on a release paper in a thickness of 50 ⁇ m or more is superposed on the lower surface of the base sheet and then the base sheet is wound again.
  • the base sheet may be composed of two layers, i.e., a base layer made of the above described ingredients and a thin colored layer provided on the base layer.
  • the thickness of the base layer preferably is about 1.0 mm - ­1.6 mm and the thickness of the colored layer preferably is about 20 ⁇ m - 25 ⁇ m.
  • the thin colored layer on the base layer is required to have the same features as those of the base layer described above, to be adhered integrally to the base layer and to be colored in a desired color for the pavement marking purpose so that the same material as, or a material which is different but has the same properties as, the unvulcanized synthetic rubber used for the base layer added with a suitable coloring agent is preferably employed.
  • the base layer which has once been wound into a roll is unwound and the colored layer is formed thereon by coating a liquidized material prepared by dissolving an unvulcanized synthetic rubber material in a solvent and adding a coloring agent affording a desired color thereto on the upper surface of the base layer by an amount sufficient for giving a desired thickness to the coated film after drying.
  • the main ingredient and filler constituting the base layer and the colored layer need not be of the same composition if these layers adhere well to each other.
  • the composition, thickness, the ratios of additives, the diameter and amount of the small glass microspheres, the kind and amount of the coloring agent etc. may be suitably determined having regard to the purpose of the sheet material.
  • the surface of the base sheet may be either flat or formed with a continuous pattern of multiplicity of protuberances and depressions.
  • the depth of embedding of the glass microspheres may be either uniform or not uniform.
  • the base sheet is formed on the surface thereof with a continuous pattern of a multiplicity of protuberances and depressions, the portion S in which the glass microspheres A and B are embedded is provided at intervals in the longitudinal direction of the base sheet or continuously in the longitudinal direction of the base sheet in a part of the base sheet as viewed in the transverse direction of the base sheet and the glass microspheres A and B in this portion S are embedded in such a manner that a depth of embedding of these glass microspheres A and B in the base sheet from the surface is randomly different one from another and a majority of the glass microspheres A and B in these protuberances and depressions are partially exposed from the surface of the base sheet.
  • the glass microspheres A and B are embedded in the surface portion of the protuberances and depressions of the base sheet in such a manner that the depth of embedding is randomly different one from another, the loss or sharp decrease in the brightness in reflection never occurs as in prior art pavement marking sheet materials even when the brightness decreases due to coming off of the glass microspheres caused by contact with wheels of the passing vehicle but a high brightness in reflection is maintained for a long period of time.
  • the sheet material can maintain a high brightness in reflection until a layer of glass microspheres of the largest depth of embedding comes off.
  • the depth of embedding of a majority of the glass microspheres embedded in the surface portion of the base sheet should differ randomly not only in the portion S in which the glass microspheres A and B coexist mixedly but also in the portion in which the glass microspheres A only are dispersed.
  • Fig. 1 shows an example of the preferable form of the base sheet.
  • Fig. 1 is an enlarged sectional view of the base sheet of Fig. 2 taken along lines I - I in Fig. 2.
  • a continuous pattern of a multiplicity of protuberances 2 and depressions 3 of random shapes and dimensions is formed on the surface of a base sheet 1.
  • a multiplicity of glass microspheres A and B are embedded in the base sheet 1 in such a manner that a depth of embedding of the glass microspheres A and B in the base sheet 1 from the surface of each protuberance 2 and depression 3 is randomly different one from another.
  • Reference numerals 4, 5 and 6 designate respectively an adhesive layer, small glass microspheres and wear resisting particles.
  • a process for manufacturing the sheet material will now be described about a sheet material in which the glass microspheres A are dispersed over the entire surface of the base sheet including both the portion S and the rest of the base sheet and the depth of embedding of the glass microspheres in the surface portion of each protuberance and depression of the base sheet is randomly different in both the portion S and the rest of the base sheet.
  • the base sheet 1 manufactured in the above described manner is unwound from the roll and a solvent is coated on the unwound base sheet 1 for facilitating embedding of the glass microspheres A and B.
  • the glass microspheres A are uniformly dispersed from a hopper (not shown) over an undried surface of the moving base sheet 1.
  • the glass microspheres B are dispersed from another hopper (not shown) disposed downstream from the hopper containing the glass microspheres A over the undried surface of the base sheet intermittently at predetermined time intervals or, alternatively, continuously over a part of the base sheet as viewed in the transverse direction of the base sheet.
  • the base sheet then is dried.
  • a coating material which is of a composition identical or similar to that of the base sheet 1 may be coated on the surface of the base sheet 1. Then, the base sheet 1 on which the glass microspheres A and B are dispersed is passed through an embossing device so that an embossed pattern of desired shape and dimensions is formed and simultaneously the glass microspheres A and B are embedded in the surface portion of each protuberance 2 and depression 3 of the base sheet 1 thus formed by the embossing.
  • the embossing device used in making the sheet material of the invention is one whose protuberances and depressions respectively are not of a flat surface, if viewed in an enlarged scale, but are formed with a multitude of small depressions with depth and diameter ranging from several tens microns to several hundred microns.
  • a multiplicity of glass microspheres A and B whose depth of embedding is randomly different one from another are embedded in the surface portion of the respective protuberances 2 and depressions 3 of the base sheet 1 formed through the embossing process. If necessary, the surface of the embossed base sheet 1 is treated with a releasing agent. The base sheet 1 thereafter is dried and wound into a roll to provide a finished product.
  • the method of providing protuberances and depressions on the surface of the base sheet 1 is not limited to the above described embossing process but any other method capable of forming a multitude of continuous protuberances and depressions may be employed.
  • the embossing device it is effective in some case to apply the embossing process twice depending upon the embossing pattern of the embossing device used.
  • Glass microspheres B having an average diameter of 70 ⁇ m and refractive index of 2.2 were dispersed over the base sheet to form a belt-like section of a width of 25 mm at an interval of 300 mm in the longitudinal direction of the base sheet.
  • the base sheet was then dried at 80°C for 5 minutes.
  • the base sheet was then passed through an embossing device at an embossing temperature of 80°C whereby the glass microspheres were densely embedded in the surface portion of protuberances and depressions formed on the base sheet.
  • a releasing agent comprising a synthetic resin as a main ingredient was coated on the base sheet.
  • the base sheet was then dried and wound into a roll to provide a finished product. Since an excessive thickness of the releasing agent layer decreases the brightness in reflection, the coating thickness of the releasing agent on the glass microspheres should be less than about 2 ⁇ m.
  • the sheet material is cut into a belt of a suitable width, e.g., 150 mm.
  • a base sheet of two layer structure consisting of the base layer and the colored layer of the following composition was manufactured:
  • a base sheet of two layer structure of the base layer and the colored layer of the following compositions was manufactured:
  • a base sheet having a base layer of a thickness of 1.6 mm and a width of 1,000 mm and a colored layer of a thickness of 20 ⁇ m is formed by the same process as in Example 2 and superposition of a release paper and coating of solvent were carried in the same manner as in Example 2.
  • glass microspheres B having an average diameter of 80 ⁇ m and refractive index of 2.2 were dispersed over the base sheet in the form of a belt-like section of a width of 30 mm at an interval of 350 mm in the longitudinal direction of the base sheet.
  • These glass microsphers B were embedded substantially uniformly into the base sheet by a depth of about 40 ⁇ m by applying a light pressure over them by means of a roll.
  • glass microspheres A having an average diameter of 200 ⁇ m and refractive index of 1.9 were dispersed over the base sheet substantially uniformly and these glass microspheres A were embedded into the base sheet by a depth of about 60 ⁇ m by applying a light pressure over them by means of a roll.
  • the base sheet was dried at 80°C for 5 minutes and then wound into a roll.
  • a sheet material in which the glass microspheres A and B are embedded in a base sheet of a flat surface was obtained.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Signs Or Road Markings (AREA)
  • Road Paving Structures (AREA)
EP87302019A 1986-03-11 1987-03-10 Allwetter-taugliche Strassenmarkierungsmaterialbahn Expired - Lifetime EP0237315B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87302019T ATE66983T1 (de) 1986-03-11 1987-03-10 Allwetter-taugliche strassenmarkierungsmaterialbahn.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP61054347A JPS62211403A (ja) 1986-03-11 1986-03-11 全天候型路面標示用シ−ト材
JP54347/86 1986-03-11

Publications (3)

Publication Number Publication Date
EP0237315A2 true EP0237315A2 (de) 1987-09-16
EP0237315A3 EP0237315A3 (en) 1988-07-13
EP0237315B1 EP0237315B1 (de) 1991-09-04

Family

ID=12968091

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87302019A Expired - Lifetime EP0237315B1 (de) 1986-03-11 1987-03-10 Allwetter-taugliche Strassenmarkierungsmaterialbahn

Country Status (8)

Country Link
EP (1) EP0237315B1 (de)
JP (1) JPS62211403A (de)
AT (1) ATE66983T1 (de)
AU (1) AU580704B2 (de)
CA (1) CA1286269C (de)
DE (1) DE3772597D1 (de)
ES (1) ES2025156B3 (de)
IN (1) IN169320B (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0385746A1 (de) * 1989-03-01 1990-09-05 Atom Chemical Paint Co., Ltd. Allwettertaugliche Strassenmarkierungsmaterialbahn mit hoher Sichtbarkeit
US4988555A (en) * 1988-06-09 1991-01-29 Minnesota Mining And Manufacturing Company Patterned pavement marking
US4988541A (en) * 1988-06-09 1991-01-29 Minnesota Mining And Manufacturing Company Process for making retroreflector sheet
GB2259516A (en) * 1992-04-10 1993-03-17 P M Crafts Limited A plastics sheet
AT399178B (de) * 1989-11-09 1995-03-27 Mayreder Kraus & Co Ing Verkehrsleiteinrichtung
WO1998023818A1 (en) * 1996-11-26 1998-06-04 Minnesota Mining And Manufacturing Company Wet retroreflective pavement marking articles
WO1998053145A1 (en) * 1997-05-20 1998-11-26 Akzo Nobel N.V. Retroreflecting road marking system
WO2000058561A1 (en) * 1999-03-26 2000-10-05 Minnesota Mining And Manufacturing Company Pavement marking article and method of producing
WO2003016635A1 (en) * 2001-08-14 2003-02-27 3M Innovative Properties Company Composite pavement markings
GB2389615B (en) * 2002-06-14 2006-10-18 Prismo Ltd Retroflective device and method of manufacture thereof
WO2007092635A1 (en) * 2006-02-09 2007-08-16 3M Innovative Properties Company Road surface marking material
WO2008125886A1 (en) * 2007-04-16 2008-10-23 Prismo Road Markings Limited Marking
WO2017044418A1 (en) * 2015-09-11 2017-03-16 3M Innovative Properties Company Durable retroreflective elements with a blend of beads

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JP6057434B2 (ja) * 2011-07-29 2017-01-11 太平洋プレコン工業株式会社 太陽熱高反射構造体
JP6048766B2 (ja) * 2015-03-08 2016-12-21 株式会社ミカド交設 反射体の製造方法
CN112710632A (zh) * 2021-03-23 2021-04-27 四川京炜交通工程技术有限公司 一种玻璃微珠高低折射率检测方法及系统

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AT307282B (de) * 1969-04-14 1973-05-10 Eigenmann Ludwig Material für Markierungen auf Straßenoberflächen
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DE7713988U1 (de) * 1977-04-28 1977-09-22 Minnesota Mining And Manufacturing Co., Saint Paul, Minn. (V.St.A.) Streifenmaterialbahn
US4069281A (en) * 1974-09-30 1978-01-17 Ludwig Eigenmann Prefabricated roadway marking strip material and method for producing same
US4388359A (en) * 1982-04-23 1983-06-14 Minnesota Mining And Manufacturing Company Embossed pavement-marking sheet material
EP0101084A2 (de) * 1982-08-16 1984-02-22 Ludwig Dr. Eigenmann Vorgefertigtes, reflektierendes, bandförmiges Strassenmarkierungsmaterial und Verfahren zur Herstellung desselben und von dessen Bestandteilen
JPS60238505A (ja) * 1984-05-10 1985-11-27 アトム化学塗料株式会社 全天候型路面表示用シ−ト材

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JPS5248735B2 (de) * 1973-05-29 1977-12-12
JPS5236993A (en) * 1975-09-19 1977-03-22 Toyo Ink Mfg Co Ltd Method of manufacturing recycle reflection sheet
JPS60147332A (ja) * 1984-01-13 1985-08-03 西武ポリマ化成株式會社 耐久性路面標示用シ−ト材
US4564556A (en) * 1984-09-24 1986-01-14 Minnesota Mining And Manufacturing Company Transparent non-vitreous ceramic particulate

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215051A (en) * 1961-12-01 1965-11-02 Jr Edwin R Gill Marking of roadways
GB1107799A (en) * 1965-07-19 1968-03-27 Tarkett Ab Improvements in or relating to light reflecting road marking materials, and methods for their manufacture
DE1784541A1 (de) * 1968-08-17 1972-01-27 Prismo Safety Corp Reflektierende Markierungsvorrichtungen fuer Strassen und Wege
AT307282B (de) * 1969-04-14 1973-05-10 Eigenmann Ludwig Material für Markierungen auf Straßenoberflächen
DE2117765A1 (de) * 1970-04-07 1971-10-21
US3915771A (en) * 1974-03-04 1975-10-28 Minnesota Mining & Mfg Pavement-marking tape
US4069281A (en) * 1974-09-30 1978-01-17 Ludwig Eigenmann Prefabricated roadway marking strip material and method for producing same
DE7713988U1 (de) * 1977-04-28 1977-09-22 Minnesota Mining And Manufacturing Co., Saint Paul, Minn. (V.St.A.) Streifenmaterialbahn
US4388359A (en) * 1982-04-23 1983-06-14 Minnesota Mining And Manufacturing Company Embossed pavement-marking sheet material
EP0101084A2 (de) * 1982-08-16 1984-02-22 Ludwig Dr. Eigenmann Vorgefertigtes, reflektierendes, bandförmiges Strassenmarkierungsmaterial und Verfahren zur Herstellung desselben und von dessen Bestandteilen
JPS60238505A (ja) * 1984-05-10 1985-11-27 アトム化学塗料株式会社 全天候型路面表示用シ−ト材

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4988555A (en) * 1988-06-09 1991-01-29 Minnesota Mining And Manufacturing Company Patterned pavement marking
US4988541A (en) * 1988-06-09 1991-01-29 Minnesota Mining And Manufacturing Company Process for making retroreflector sheet
EP0385746A1 (de) * 1989-03-01 1990-09-05 Atom Chemical Paint Co., Ltd. Allwettertaugliche Strassenmarkierungsmaterialbahn mit hoher Sichtbarkeit
AT399178B (de) * 1989-11-09 1995-03-27 Mayreder Kraus & Co Ing Verkehrsleiteinrichtung
GB2259516A (en) * 1992-04-10 1993-03-17 P M Crafts Limited A plastics sheet
GB2259516B (en) * 1992-04-10 1993-08-11 P M Crafts Limited A plastics sheet
WO1998023818A1 (en) * 1996-11-26 1998-06-04 Minnesota Mining And Manufacturing Company Wet retroreflective pavement marking articles
US5777791A (en) * 1996-11-26 1998-07-07 Minnesota Mining And Manufacturing Company Wet retroreflective pavement marking articles
US6368660B1 (en) 1997-05-20 2002-04-09 Akzo Nobel N.V. Retroreflecting road marking system
WO1998053145A1 (en) * 1997-05-20 1998-11-26 Akzo Nobel N.V. Retroreflecting road marking system
WO2000058561A1 (en) * 1999-03-26 2000-10-05 Minnesota Mining And Manufacturing Company Pavement marking article and method of producing
US6412957B1 (en) 1999-03-26 2002-07-02 3M Innovative Properties Company Pavement marking article and method of producing
WO2003016635A1 (en) * 2001-08-14 2003-02-27 3M Innovative Properties Company Composite pavement markings
US6841223B2 (en) 2001-08-14 2005-01-11 3M Innovative Properties Company Composite pavement markings
GB2389615B (en) * 2002-06-14 2006-10-18 Prismo Ltd Retroflective device and method of manufacture thereof
WO2007092635A1 (en) * 2006-02-09 2007-08-16 3M Innovative Properties Company Road surface marking material
WO2008125886A1 (en) * 2007-04-16 2008-10-23 Prismo Road Markings Limited Marking
WO2017044418A1 (en) * 2015-09-11 2017-03-16 3M Innovative Properties Company Durable retroreflective elements with a blend of beads
US10858496B2 (en) 2015-09-11 2020-12-08 3M Innovative Properties Company Durable retroreflective elements with a blend of beads
US11286368B2 (en) 2015-09-11 2022-03-29 3M Innovative Properties Company Durable retroreflective elements with a blend of beads
US12043723B2 (en) 2015-09-11 2024-07-23 3M Innovative Properties Company Durable retroreflective elements with a blend of beads

Also Published As

Publication number Publication date
EP0237315A3 (en) 1988-07-13
EP0237315B1 (de) 1991-09-04
JPS62211403A (ja) 1987-09-17
AU580704B2 (en) 1989-01-27
ES2025156B3 (es) 1992-03-16
DE3772597D1 (de) 1991-10-10
IN169320B (de) 1991-09-28
ATE66983T1 (de) 1991-09-15
AU6990787A (en) 1987-10-01
CA1286269C (en) 1991-07-16

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