DE2831386A1 - PROCESS FOR PRODUCING AND APPLYING ROAD MARKINGS - Google Patents

Description

HEINZ H. PUSCKMANN ■ PATENTANWALT D 8000 MÖNCHEN 22 · THOMAS-WIMM ^ R-RING 14

TELEPHONE 089/2278 87

Barry David Pacey Munich, July 17th, 1978

44, Coppice Avenue, P 588/78

Harrogate, Pu / rei

North Yorkshire,
HG1 2DL, England

Process for the production and application of Road markings

So far there are four main methods of marking road surfaces for example with notices or with continuous or interrupted white or yellow stripes.

The easiest and probably the cheapest method is to paint the markings on the asphalt surface of the road using a chlorinated gum paint, for example an alloprene paint. The areas of the street to be marked are cleaned and the abrasion is removed, the desired mark is drawn with chalk on the road surface, then the outlined areas are painted in. The freshly painted areas are prevented from being driven on by the traffic cone Traffic protected until dry.

Although this is certainly the most direct method, it can only be used relatively slowly. Also uses the color due to the constantly driving over traffic quickly. In addition, the paint is not reflective.

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A second method is used to produce rigid, preformed plastics markings applied to the road surface with a two-component adhesive. There is one of the glue Component on the plastic parts that becomes the other component applied to the road surface accordingly. After that, the plastic markings are coated with their side on the pretreated road surface is placed and pressed on so that both components are connected to one another and thus the markings connect with the road. The most common way of doing this is to use PVC in thin sheets, as is customary with foot junctions.

This second method can produce good markings but a high pressure is required to make a satisfactory connection between marking and To reach the road surface. In view of the relatively expensive material and the sophisticated adhesives used for this are required, the process is rather expensive, disadvantageous is also that every movement in the amorphous asphalt surface in the PVC surface leads to cracks or to its detachment.

The third method most commonly used today is to make white stripes or white and yellow double stripes a thermoplastic material can be applied to the road surface. The material is an asphalt-based plastic, which already contains the pigments required to set it apart in color from the road surface, and the one in the British one Standard 3262 entitled "Hot-applied Thermoplastic Pavement Markings" is described. Size Blocks of this material are melted in a kettle or small furnace that is appropriately equipped at the rear end of Trucks are set up. The melt is then sprayed under pressure onto the pavement, so that the desired Markings arise.

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By using mechanical control devices for the Spray jet width and length of the stripes can be determined.

This third method allows a relatively quick one Working method and the required truck offer the necessary protection against the following traffic. Disadvantageous However, here are the high costs for the truck, the relatively thin layer that is applied when large Traffic density is quickly eroded, and the fact that this method is only suitable for applying rectilinear markings suitable. Signs, lettering and horizontal stripes cannot be applied with this method.

The fourth method, known as stencil marking - screedapplied road marking - offers the most advantages over the three aforementioned methods. In this process, bags are made or drumming the thermoplastic material to the point of use and then broken into small pieces suitable for melting in a cauldron.

The melt is then put into a specially designed road marking machine transferred, in which a smaller boiler is built in to keep the material in a molten state while special stencils or chalk markings are applied to the road. The hot, liquid one Asphalt is then applied via a suitable pouring device within the pre-drawn markings.

The markings produced in this way are very durable because they are automatically applied in sufficient thickness will. The long service life partly outweighs the considerable effort required for a special marking machine. However the very heavy blocks of material must first be brought to the processing site, in a separate boiler or oven

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melted, the discharge container in the hardening machine fed in and reheated there so that they do not lose their plasticity. When pouring out the Liquid material on the road surface may or may overflow over the edges of the stencils or chalk marks - Injecting so that a person must follow the marking machine on foot to get the edges of the markings before hardening trim the material. For affixing complicated symbols or words this practice is not well suited; in addition, the thickly applied markings are easy to step Cracks open. Removal is only possible by tearing open, in which case the pavement must be renewed in this area, or by painting over, with the disadvantage that the paint is easily removed and the original marking appears again It is also possible to burn off the markings, but with the risk of destroying the road surface will. Finally, it has also been found that the hardened markings made of thermoplastic materials are very firmly attached to them Connect the road surface and protrude relatively strongly above the level of the road surface, so that the approaching traffic causes increased abrasion and rapid break-up of the marking.

All of the above-mentioned methods are therefore afflicted with considerable deficiencies. The spraying or flowing of thermoplastic Material is generally preferred, but in some cases the pre-formed plastic markers are used, since it is not easy to use thermoplastic material the usual Apply to a pavement using these methods as required; the application with the help of pouring devices often leads to the formation of streaks in the marking, especially when larger areas are to be poured.

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The object of the invention is to provide a new method for the application from thermoplastic material on pavement to their marking with indications such as stripes, solid lines and To create curved direction arrows, with the help of which long-lasting and dimensionally stable markings can be generated with little effort are, as well as the creation of such markings.

This object is achieved according to the invention in that an asphalt-containing thermoplastic material with an additive is heated by rubber-like-making agents or a plasticizer, that the heated mixture is poured out in a predetermined shape or shaped and its hardening is made possible that the markings formed in this way on the road surface placed and in a fixed connection with the road surface allowing the extent while maintaining the given Shape is heated.

The inventive method combines the advantages of the known thermoplastic method with the advantages of using preformed plastic markings. The road markings can therefore be "in stock" under exact conditions at any one from the place of use. They can be made in any shape, type and thickness you want and can be handled at normal temperatures without breaking or tearing. They can be left at the place of manufacture pack until they are to be delivered to a specific place of use. The finished road markings can be used on site can be laid out in quick succession. It is then only necessary to apply a hot jet to it they connect to the road surface.

If the markings are to be changed or completely removed at a later point in time, they usually subside a suitable pretreatment from the road without

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the road surface is significantly affected. There is therefore no risk of the markings on "reappear" on the road surface, as is the case with a mere painting over.

The asphalt-based thermoplastic material usually contains reflective glass particles which are then present in the same way in the finished preformed markings. It has However, it turned out that by heating the one rubbery making agent or material containing a plasticizer and then applying and curing the reflective Glass particles settle at the bottom of the marking.

It is therefore advantageous to place a layer of reflective glass particles on the heated surface when placing the marking on the road surface Apply markings. This gives the markings the desired reflective property right from the start. If after some time this top layer of the marking has been removed by the traffic driving over it, it is the marking itself has also been removed to such an extent that the glass particles which have settled down from the original mixture are again come out and reflect.

To apply individual or parallel lines over larger road surfaces, preformed lines according to the invention Process can be applied to a mechanical unwinding device. The unwinder unwinds the strips, which can be heated from above either when unwinding from below or only after being placed on the street, so that there is an immediate hot connection with the road surface. The unwinding device can easily be mounted on a standard truck mount, which paints off the route to be marked, and then the preformed strips are unwound evenly.

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The term "suitable rubberizing agents or plasticizers" also includes any additive used in the corresponding Amount added enables the implementation of the method according to the invention and its effect consists in the make thermoplastic markings less brittle and sufficiently flexible to prevent them from flaking or cracking, and by which the markings can be properly handled at normal temperatures without affecting the thermoplastic Markings lose their ability to bond sufficiently firmly to the road surface.

Suitable rubberizing agents or plasticizers can for example, start from the following raw materials:

a) Rubberizers

I. Butadiene (CH ₂ = GH-CH = CH ₂ )

II. Isoprene (CH ₀ =? ^H 3 —CH = CH ₀

^d C *

III. Chlorinated isoprene (CH ₂ = CH-C = CH ₂ )

b) plasticizers

I. Tricresyl Phosphate

II. Doctyl phthalate

III. Dibutyl sebacate

IV. Polymer adipate laurate

c) mineral oil

d) Vegetable oil.

The new road markings according to the method according to the invention include such in the form of, for example, individual stripes, continuous lines, a letter or a not rectilinear alignment symbol that, according to the invention, by heating a mixture of asphalt-containing thermoplastic material

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with the addition of a rubbery-making agent or one Plasticizer are produced, and then the heated mixture is poured or injected into the desired shape and hardens.

The cured mixture can then, according to the invention, either have the shape of the finished road marking or can be in the form of a plate Material can be made from which a marking of the desired shape is cut out or punched out.

In both cases, reflective glass particles can hit the surface of the marking, which reflect the reflective elements that are already present in the asphalt from which the marking is largely made Add glass particles.

The following is an example of one made in accordance with the present invention Marking described in the form of a symbol.

A block of "thermoplastic" material was heated in a vat containing about 1/2% by weight of vegetable oil. After the mixture had melted, it was poured onto a pad made of water-saturated rubber from which all excess water had previously been removed. The water-saturated rubber layer formed a flat base for the cast material and was also in a very shallow trough so that the cast material could not flow beyond the shape given by the walls and harden there.

On the surface of the still warm, but on the rubber pad Material that had already solidified was applied with silicone-impregnated paper. The coated side pointed to the outside, so that the material could be rolled out by means of a roller without the roller sticking to the material itself. on this way you got a layer about 1.5 mm thick, which is now could harden.

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After the material was set, the rubber backing along with the material and the silicone-impregnated paper immersed in a water bath. This allowed the already water-saturated rubber pad to come off one side of the material and remove the silicone-impregnated paper from the other side, as the silicone has now been applied to the other side of the Paper had passed.

The thin layer of bound material produced in this way is compliant to some degree at ambient temperature. Several letters (for example the letters of the word "SLOW") cut to a predetermined shape and size.

To demonstrate the invention, these letters were later brought to where a road surface was to be marked was. The four letters of the word "SLOW" were simply placed one after the other on the street and with a blowtorch repainted quickly back and forth several times. Afterwards it could be determined that all four letters are fixed connected to the road surface.

A device specially designed for this purpose for the application of a jet of hot air is preferable to a blowtorch. The melting point of the mixture of thermoplastic material and the rubber-like solubilizing agent or plasticizer is from about +150 ⁰ C, while the hottest zone a temperature of about +450 C has at a blowtorch. If the blowtorch is used for too long, there is a risk that the marking will burn through. However, even an unskilled worker can quickly find out how long a hot jet must be directed over the markings in order to establish a firm connection without burning or twisting the marking itself.

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Below is an example of the composition of the "thermoplastic" Materials given:

_. _ · ,. .-, percent by weight of the total amount s aestanctreii minimum maximum

Binder (resin or oil) 18

Pigment 6 -

Pigment and extender 18

Reflective particle aggregates (aggregates) <

Pigment) _{? Q Q2}

Extenders and reflective <particles)

The aggregates can "for example quartz sand, quartz or Be flint. The extender consists of a powder that promotes the dispersion of the pigment.

Further details for the thermoplastic material can be found in British form no. 3262.

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Claims (5)

HEINZ H. PUSCKMANM ■ PATENT ADVOCATE D 8000 MÖNCHEN 22 THOMAS-WIMMER-RING 14 TELEPHONE 089/227887 Barry David Pacey Munich, July 17th, 1978 44, Coppice Avenue, P 588/78 Harrogate, Pu / rei North Törkshire,
■ HG-1 2 DL, England Patent claims Method for applying markings in the form of lines, symbols or characters on a road surface, thereby characterized in that an asphalt containing Thermoplastic material heated with an addition of a rubber-making agent or a plasticizer is that the heated mixture is poured or molded in a predetermined shape and its hardening is made possible, that the markings formed in this way are placed on the road surface and in a fixed connection with the road surface enabling dimensions while maintaining the given shape is heated. 2. Road marking in the form of an example an endless one Line-forming stripe, a character or a directional symbol, characterized in that, that they are made by heating an asphalt-containing thermoplastic Materials with an addition of a gumming agent or plasticizer and pouring or molding and subsequent hardening is produced in a predetermined shape. 3 · ■ Method for laying lines over larger road surfaces by unwinding the prefabricated marking according to claim 2 from an unwinding device and heating the Marking on its surface facing the road surface B09885 / 0901 ORfQlNAL INSPECTED and laying on the pavement or laying the marking on the pavement and heating from above. 4. The method according to claims 1 to 3? characterized in that on the road surface applied, still warm marking, a layer of reflecting glass particles is applied, 5. Use of asphalt-containing thermoplastic material with the addition of a rubber-making material Agents or plasticizers for casting strips, direction symbols, characters or the like after they have hardened markings to be applied to a road surface. η 91? δ ς / η 9 ο ι