EP1395470A1 - Wiper blade - Google Patents

Wiper blade

Info

Publication number
EP1395470A1
EP1395470A1 EP02732391A EP02732391A EP1395470A1 EP 1395470 A1 EP1395470 A1 EP 1395470A1 EP 02732391 A EP02732391 A EP 02732391A EP 02732391 A EP02732391 A EP 02732391A EP 1395470 A1 EP1395470 A1 EP 1395470A1
Authority
EP
European Patent Office
Prior art keywords
polyethylene
wiper
lip
wiper blade
rubber
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.)
Ceased
Application number
EP02732391A
Other languages
German (de)
French (fr)
Inventor
Andreas Vogt
Lutz Mueller
Ulrich Hasenkox
Guido Klamt
Wilma Dierkes
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to EP20050100133 priority Critical patent/EP1522472B1/en
Priority to EP20080105696 priority patent/EP2048048A3/en
Publication of EP1395470A1 publication Critical patent/EP1395470A1/en
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
    • B60S1/38—Wiper blades
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • B05D1/22—Processes for applying liquids or other fluent materials performed by dipping using fluidised-bed technique
    • B05D1/24—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • B05D1/265—Extrusion coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
    • B60S1/38—Wiper blades
    • B60S2001/3827—Wiper blades characterised by the squeegee or blade rubber or wiping element
    • B60S2001/3829—Wiper blades characterised by the squeegee or blade rubber or wiping element characterised by the material of the squeegee or coating thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2321/00—Characterised by the use of unspecified rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers

Definitions

  • the invention is based on a wiper blade for a windshield wiper, in particular for a windshield wiper of a motor vehicle, according to the type defined in the preamble of claim 1 and a method for producing a wiper blade according to the type defined in the preamble of claim 7.
  • a wiper blade of the type mentioned in the introduction is known from practice and comprises a squeegee which is formed with a squeegee lip.
  • the squeegee or the squeegee lip consists of a rubber material that is made, for example, on the basis of natural rubber.
  • Squeegees or squeegee lips of known wiper blades have the disadvantage that when they are pressed onto a glass in a conventional windshield they have a relatively high dry friction coefficient ⁇ t r 'a and the like.
  • the wiper blade according to the invention for a windshield wiper in particular for a windshield wiper of a motor vehicle, with the features according to the preamble of claim 1, in which the wiper rubber lip is partially made of polyethylene, has the advantage that the use of polyethylene as a material for the wiper rubber lip low dry friction values ⁇ tx can be achieved ..
  • the squeegee lip can either be coated with polyethylene and / or contain polyethylene in volume.
  • the polyethylene is PE-UHMW.
  • PE-UHMW ie polyethylene with an ultra-high molecular weight, is particularly suitable for coating squeegee lips, since it already has a low dry friction coefficient as a solid material.
  • a solid material sample made of PE-UHMW with a contact length of 8 mm and a load of 0.128 N on a rotating glass shaft that moves at 0.1 m / s has a dry friction coefficient ⁇ t r of 0.21.
  • PE-UHMW bonds firmly to the rubber material by diffusion. If the PE-UHMW is applied to the rubber material as a powder, it sinters during vulcanization. PE-UHMW, in particular, adheres to a rubber material in such a way that the polyethylene-rubber composite tears in the composite from a certain load.
  • the polyethylene of the wiper blade according to the invention can be PE-HD, ie high-density polyethylene, or also PE-X, ie cross-linked polyethylene.
  • PE-X is melted onto a rubber material in the manufacture of the wiper blade according to the invention and thermally crosslinked during vulcanization.
  • the invention also relates to a method for producing a wiper blade for a windshield wiper, which comprises a squeegee with a squeegee lip. In this method, the squeegee lip is made by vulcanizing a rubber material together with polyethylene.
  • the rubber material can be made on the basis of natural rubber. However, it is also conceivable to use synthetic rubber materials as the base material for the squeegee lip.
  • the vulcanization takes place under the conditions customary for vulcanizing a rubber.
  • the polyethylene is preferably in powder form as the starting material, specifically with a grain size of approximately 0.1 to 30 ⁇ m.
  • the rubber material is coated with polyethylene before vulcanization.
  • the vulcanization of the molded part coated with polyethylene can then be carried out in a molding tool.
  • the vulcanized workpiece made of the rubber material and the polyethylene is easy to demold.
  • the coating of the rubber material with polyethylene before the vulcanization can take place in such a way that the molded rubber material is coated with a dispersion containing polyethylene particles or that the rubber material is dusted with polyethylene powder.
  • a conventional electrostatic powder coating process is particularly suitable for applying a polyethylene powder.
  • the unvulcanized rubber material is advantageously dusted over its entire surface with PE powder. However, partial coverage is possible.
  • the polyethylene can also be applied to the rubber material using a fluidized bed.
  • the rubber material is extruded hot and sticky from an extruder head.
  • the rubber material then passes through an opening into a low-concentration fluidized bed made of very fine PE-UHMW powder with a grain size between 0.1 ⁇ m and 15 ⁇ m, then leaves the fluidized bed through an opening and is then blown with clean purge air. This removes the polyethylene particles that do not adhere to the rubber material.
  • the purge air can also be used to operate the fluidized bed.
  • 'unvulcanized rubber material is pressed in a hot press with stainless steel tool, for example, at a temperature of 180 ° C and a pressure of 70 bar for a period of 10 seconds in shape, then removed and cooled with water. After drying, the partially vulcanized molded rubber part is thinly dusted on both sides with PE-UHMW powder. Then the dusted molding is at a pressure of 70 bar, a temperature of 180 ° C for a period of 5 minutes in one vulcanized to the rubber mold corresponding mold.
  • the rubber material and the polyethylene can also be connected to one another by a coextrusion process.
  • a polyethylene melt, polyethylene film, polyethylene monofilament or polyethylene cord is fed in at least in the area of the squeegee lip of the squeegee. Then the rubber material and the polyethylene attached to it are vulcanized together.
  • the wiper rubber with the wiper rubber lip by an injection molding process.
  • a film, a monofilament or a cord made of polyethylene is introduced into an injection molding prior to injection molding, or else the injection mold is coated with a dispersion or a powder made of polyethylene.
  • the squeegee lip is expediently produced from a mixture which comprises the rubber material and the polyethylene.
  • the mixture contains between 1% and 50% polyethylene powder, in particular PE-UHMW powder.
  • Figure 1 is a schematic representation of a wiper blade in cross section
  • FIG. 2 is a cross-sectional view of a second embodiment of a wiper blade
  • Figure 3 shows a third embodiment of a wiper blade in cross section
  • Figure 4 shows a fourth embodiment of a wiper blade.
  • FIG. 1 shows a wiper blade which consists of a wiper lip 2 made of rubber material, which has a wiper edge 5, a head part 3 made of rubber material, which is only partially shown here, and a so-called folding web 4 made of rubber material, which is arranged between the head part 3 and the wiper lip 2 is.
  • the wiper lip 2, the head part 3 and the folding web 4 are provided with a surface which is formed from a polyethylene layer 1 which, for the sake of clarity, is compared to the wiper lip 2, the head part 3 and the transfer bridge 4 is shown enlarged.
  • the polyethylene layer 1 consists of PE-UHMW, ie of ultra-high molecular weight polyethylene.
  • the wiper blade according to FIG. 1 is produced in such a way that first partially vulcanized rubber material is pressed in an extruder by means of a tool in the form of a wiper blade, then dusted with PE-UHMW powder and then vulcanized.
  • the vulcanization conditions correspond to the usual vulcanization conditions.
  • the material properties of the wiper rubber lip are such that, in a measurement in which the wiper blade 1 is in contact with a rotating glass plate and wiping speeds and pressure conditions are present as in a motor vehicle, dry friction values ⁇ tr between 0.32 and 0.48 can be achieved.
  • the exemplary embodiment of a wiper blade shown in FIG. 2 essentially comprises the same components as the wiper blade according to FIG. 1. However, the wiper blade according to FIG. 2 differs from that according to FIG. 1 by a so-called wiper edge 5, which is free of polyethylene.
  • the embodiment of a wiper blade shown in Figure 3 also includes essentially the same components as the embodiment of Figure 1, but differs from the latter in that the. the wiper lip 2 formed wiping edge 5, the folding bridge 4 and the head part 3 are free of polyethylene and the Wiper lip 2 is coated only in its lateral areas adjacent to the wiping edge 5, ie is only partially coated with polyethylene.
  • FIG. 4 shows a wiper blade which essentially comprises a head part 3 made of rubber material, only partially shown, a folding web 4 made of rubber material adjoining the head part 3 and a wiper lip 6 with a wiper edge 5.
  • the wiper lip 6 consists of rubber material, in which polyethylene in the form of PE-UHMW is embedded.
  • the wiper lip 6 is made from a starting material that contains about 40% polyethylene.
  • the squeegee is an extrusion.
  • the squeegee can also be produced in a known manner by an extrusion process or by compression molding.

Abstract

The invention relates to a wiper blade for a windshield wiper, especially for a windshield wiper of a motor vehicle. Said wiper blade comprises a rubber element having a lip (2). The aim of the invention is to provide a reduced coefficient of dry friction. To this end, the lip (2) of the rubber wiper blade element consists partially of polyethylene.

Description

Wischerblattwiper blade
Stand der TechnikState of the art
Die Erfindung geht von einem Wischerblatt für einen Scheibenwischer, insbesondere für einen Scheibenwischer eines Kraftfahrzeuges, gemäß der im Oberbegriff des Patentanspruches 1 näher definierten Art sowie einem Verfahren zur Herstellung eines Wischerblatts gemäß der im Oberbegriff des Patentanspruches 7 näher definierten Art aus .The invention is based on a wiper blade for a windshield wiper, in particular for a windshield wiper of a motor vehicle, according to the type defined in the preamble of claim 1 and a method for producing a wiper blade according to the type defined in the preamble of claim 7.
Ein Wischerblatt der einleitend genannten Art ist aus der Praxis bekannt und umfaßt einen Wischgummi, der mit einer Wischgummilippe ausgebildet ist. Der Wischgummi bzw. die Wischgummilippe besteht aus einem Gummimaterial, das beispielsweise auf der Basis von Naturkautschuk hergestellt is . Wischgummis bzw. Wischgummilippen bekannter Wischerblätter haben den Nachteil, daß sie bei Betätigung auf einein Glas einer herkömmlichen Windschutzscheibe relativ hohe Trockenreibwerte μtr ' au.fweisen.A wiper blade of the type mentioned in the introduction is known from practice and comprises a squeegee which is formed with a squeegee lip. The squeegee or the squeegee lip consists of a rubber material that is made, for example, on the basis of natural rubber. Squeegees or squeegee lips of known wiper blades have the disadvantage that when they are pressed onto a glass in a conventional windshield they have a relatively high dry friction coefficient µ t r 'a and the like.
Derartige Trockenreibwerte, die zwischen 0,8 und 1,2 liegen und höher als die bei nasser Windschutzscheibe auftretenden Reibwerte sind, machen leistungsstarke und damit kostenintensive Scheibenwischerantriebe erforderlich.Such dry friction values, which are between 0.8 and 1.2 and are higher than the friction values that occur when the windshield is wet, make powerful and therefore cost-intensive windshield wiper drives necessary.
Vorteile .'der ErfindungBenefits . 'of the invention
Das erfindungsgemäße Wischerblatt für einen Scheibenwischer, insbesondere für einen Scheibenwischer eines Kraftfahrzeuges, mit den Merkmalen nach dem Oberbegriff des Patentanspruches 1, bei dem die Wischgummilippe teilweise aus Polyethylen gefertigt ist, hat demgegenüber den Vorteil, daß durch den Einsatz von Polyethylen als Werkstoff für die Wischgummilippe geringe Trockenreibwerte μtx erreicht werden können..The wiper blade according to the invention for a windshield wiper, in particular for a windshield wiper of a motor vehicle, with the features according to the preamble of claim 1, in which the wiper rubber lip is partially made of polyethylene, has the advantage that the use of polyethylene as a material for the wiper rubber lip low dry friction values μ tx can be achieved ..
Dies führt bei bestimmten Betriebsbedingungen gegenüber dem Stand der Technik zu einer geringeren Geräuschentwicklung, und zwar auch bei trockener Windschutzscheibe.Under certain operating conditions, this leads to less noise than in the prior art, even with a dry windshield.
Durch die gegenüber dem Stand der Technik geringen Trockenreibwerte des Wischerblatts nach der Erfindung können vorteilhafterweise kleiner dimensionierte Wischerantriebe- mit entsprechend verminderter Leistung eingesetzt werden. Die Wischgummilippe kann entweder mit Polyethylen beschichtet sein und/oder im Volumen Polyethylen enthalten.Due to the low dry friction values of the wiper blade according to the invention compared to the prior art, smaller-sized wiper drives with a correspondingly reduced power can advantageously be used. The squeegee lip can either be coated with polyethylene and / or contain polyethylene in volume.
Nach einer bevorzugten Ausführungsform handelt es sich bei dem Polyethylen um PE-UHMW. PE-UHMW, d.h. Polyethylen mit ultrahohem Molekulargewicht, eignet sich besonders zur Beschichtung von Wischgummilippen, da es schon als Vollmaterial einen niedrigen Trockenreibwert besitzt. So hat z.B. eine Vollmaterialprobe aus PE-UHMW bei einer Kontaktlänge von 8 mm und einer Last von 0,128 N an einer rotierenden Glaswelle, die sich mit 0,1 m/s bewegt, einen Trockenreibwert μtr von 0,21.According to a preferred embodiment, the polyethylene is PE-UHMW. PE-UHMW, ie polyethylene with an ultra-high molecular weight, is particularly suitable for coating squeegee lips, since it already has a low dry friction coefficient as a solid material. For example, a solid material sample made of PE-UHMW with a contact length of 8 mm and a load of 0.128 N on a rotating glass shaft that moves at 0.1 m / s has a dry friction coefficient μ t r of 0.21.
Bei einem Vulkanisieren eines Gummimaterials, das mit PE- UHMW beschichtet ist, verbindet sich das PE-UHMW durch Diffusion haftfest mit dem Gummimaterial . Sofern das PE-UHMW als Pulver auf das Gummimaterial aufgebracht ist, sintert es während der Vulkanisation. Insbesondere PE-UHMW haftet derart an einem Gummimaterial, daß der Polyethylen-Gummi- Materialverbund ab einer bestimmten Belastung im Verbund reißt .When a rubber material that is coated with PE-UHMW is vulcanized, the PE-UHMW bonds firmly to the rubber material by diffusion. If the PE-UHMW is applied to the rubber material as a powder, it sinters during vulcanization. PE-UHMW, in particular, adheres to a rubber material in such a way that the polyethylene-rubber composite tears in the composite from a certain load.
Alternativ kann es sich bei dem Polyethylen des Wischerblatts nach der Erfindung um PE-HD, d.h. um Polyethylen hoher Dichte, oder auch um PE-X, d.h. um vernetztes Polyethylen, handeln. Insbesondere PE-X wird bei der Herstellung des Wischerblatts nach der Erfindung schmelzflüssig auf ein Gummimaterial aufgebracht und während dem Vulkanisieren thermisch nachvernetzt. Die Erfindung hat auch ein Verfahren zur Herstellung eines Wischerblatts für einen Scheibenwischer, welcher einen Wischgummi mit einer Wischgummilippe umfaßt, zum Gegenstand. Bei diesem Verfahren wird die Wischgummilippe durch Vulkanisieren eines Gummimaterials zusammen mit Polyethylen hergestellt .Alternatively, the polyethylene of the wiper blade according to the invention can be PE-HD, ie high-density polyethylene, or also PE-X, ie cross-linked polyethylene. In particular, PE-X is melted onto a rubber material in the manufacture of the wiper blade according to the invention and thermally crosslinked during vulcanization. The invention also relates to a method for producing a wiper blade for a windshield wiper, which comprises a squeegee with a squeegee lip. In this method, the squeegee lip is made by vulcanizing a rubber material together with polyethylene.
Das Gummimaterial kann auf Basis von Naturkautschuk hergestellt sein. Denkbar ist es aber auch, synthetische Gummi- materialien als Grundmaterial für die Wischgummilippe einzusetzen.The rubber material can be made on the basis of natural rubber. However, it is also conceivable to use synthetic rubber materials as the base material for the squeegee lip.
Bei einer bevorzugten Ausführungsform des Verfahrens nach der Erfindung erfolgt das Vulkanisieren unter den bei einer Vulkanisation eines Gummis üblichen Bedingungen.In a preferred embodiment of the method according to the invention, the vulcanization takes place under the conditions customary for vulcanizing a rubber.
Bevorzugt liegt das Polyethylen als Ausgangsstoff pulver- för ig vor, und zwar mit einer Korngröße von etwa 0, 1 μ bis 30 μm.The polyethylene is preferably in powder form as the starting material, specifically with a grain size of approximately 0.1 to 30 μm.
Bei einer vorteilhaften Ausführung des Verfahrens nach der Erfindung wird das Gummimaterial vor dem Vulkanisieren mit Polyethylen beschichtet. Das Vulkanisieren des mit Polyethylen beschichteten Formteils kann dann in einem Formwerkzeug erfolgen. Das vulkanisierte Werkstück aus dem Gummimaterial und dem Polyethylen ist leicht entformbar.In an advantageous embodiment of the method according to the invention, the rubber material is coated with polyethylene before vulcanization. The vulcanization of the molded part coated with polyethylene can then be carried out in a molding tool. The vulcanized workpiece made of the rubber material and the polyethylene is easy to demold.
Die vor dem gemeinsamen Vulkanisieren erfolgende Beschichtung des Gummimaterials mit Polyethylen kann derart erfolgen, daß das in Form gebrachte Gummimaterial mit einer Polyethylen-Partikel enthaltenden Dispersion beschichtet wird, oder daß das Gummimaterial mit Polyethylen-Pulver bestäubt wird. Insbesondere zum Aufbringen eines Polyethylen- Pulvers eignet sich ein übliches elektrostatisches Pulver- beschichtungsverfahren. Vorteilhafterweise wird das unvul- kanisierte Gummimaterial vollflächig mit PE-Pulver bestäubt. Eine teilweise Abdeckung ist aber möglich.The coating of the rubber material with polyethylene before the vulcanization can take place in such a way that the molded rubber material is coated with a dispersion containing polyethylene particles or that the rubber material is dusted with polyethylene powder. A conventional electrostatic powder coating process is particularly suitable for applying a polyethylene powder. The unvulcanized rubber material is advantageously dusted over its entire surface with PE powder. However, partial coverage is possible.
Das Polyethylen kann aber auch mittels eines Wirbelbetts auf das Gummimaterial aufgebracht werden. Bei einer vorteilhaften Ausführungsform wird das Gummimaterial hierbei heiß und klebrig aus einem Extruderkopf extrudiert . Das Gummimaterial gelangt dann durch eine Öffnung in ein niedrig konzentriertes Wirbelbett aus sehr feinem PE-UHMW- Pulver mit einer Korngröße zwischen 0,1 μm und 15 μm, verläßt dann das Wirbelbett durch eine Öffnung, um dann mit sauberer Spülluft angeblasen zu werden. Dadurch werden die nicht an dem Gummimaterial haftenden Polyethylen-Partikel entfernt. Die Spülluft kann wiederum auch zum Betrieb des Wirbelbetts genutzt werden.The polyethylene can also be applied to the rubber material using a fluidized bed. In an advantageous embodiment, the rubber material is extruded hot and sticky from an extruder head. The rubber material then passes through an opening into a low-concentration fluidized bed made of very fine PE-UHMW powder with a grain size between 0.1 μm and 15 μm, then leaves the fluidized bed through an opening and is then blown with clean purge air. This removes the polyethylene particles that do not adhere to the rubber material. The purge air can also be used to operate the fluidized bed.
Bei einer weiteren Ausfuhrungsform des Verfahrens nach der Erfindung' wird unvulkanisiertes Gummimaterial in einer Heißpresse mit Edelstahlwerkzeug beispielsweise bei einer Temperatur von 180°C und einem Druck von 70 bar für eine Zeitdauer von 10 Sekunden in Form gepreßt, dann entnommen und mit Wasser abgekühlt. Nach dem Trocknen wird das so gefertigte, teilvulkanisierte Gummiformteil mit PE-UHMW- Pulver beidseitig dünn bestäubt. Anschließend wird das bestäubte Formteil bei einem Druck von 70 bar, einer Temperatur von 180 °C für eine Zeitdauer von 5 Minuten in einem mit dem Gummiformteil korrespondierenden Formwerkzeug vulkanisiert .In a further embodiment of the method according to the invention 'unvulcanized rubber material is pressed in a hot press with stainless steel tool, for example, at a temperature of 180 ° C and a pressure of 70 bar for a period of 10 seconds in shape, then removed and cooled with water. After drying, the partially vulcanized molded rubber part is thinly dusted on both sides with PE-UHMW powder. Then the dusted molding is at a pressure of 70 bar, a temperature of 180 ° C for a period of 5 minutes in one vulcanized to the rubber mold corresponding mold.
Das Gummimaterial und das Polyethylen können aber auch nach einem Coextrusionsverfahren miteinander verbunden werden. Bei der Coextrusion wird hierbei zumindest im Bereich der Wischgummilippe des Wischgummis eine Polyethylen-Schmelze, Polyethylen-Folie, Polyethylen-Monofile oder Polyethylen- Schnur zugeführt. Anschließend werden das Gummimaterial und das an diesem anliegende Polyethylen gemeinsam vulkani- siert .The rubber material and the polyethylene can also be connected to one another by a coextrusion process. In the case of coextrusion, a polyethylene melt, polyethylene film, polyethylene monofilament or polyethylene cord is fed in at least in the area of the squeegee lip of the squeegee. Then the rubber material and the polyethylene attached to it are vulcanized together.
Es ist aber auch möglich, den Wischergummi mit der Wischgummilippe nach einem Spritzgußverfahren herzustellen. Dabei wird eine Folie, ein Monofile oder eine Schnur aus Polyethylen vor dem Spritzgießen in eine Spritzgußfortn eingebracht, oder aber die Spritzgießform wird mit einer Dispersion oder einem Pulver aus Polyethylen beschichtet.However, it is also possible to produce the wiper rubber with the wiper rubber lip by an injection molding process. In this case, a film, a monofilament or a cord made of polyethylene is introduced into an injection molding prior to injection molding, or else the injection mold is coated with a dispersion or a powder made of polyethylene.
Wenn das Polyethylen im Volumen der Wischgum ilippe enthalten sein soll, wird die Wischgummilippe zweckmäßigerweise aus einer Mischung hergestellt, die das Gummimaterial und das Polyethylen umfaßt .If the polyethylene is to be contained in the volume of the squeegee lip, the squeegee lip is expediently produced from a mixture which comprises the rubber material and the polyethylene.
Nach einer vorteilhaften Ausfuhrungsform enthält die Mischung zwischen 1% und 50% Polyethylen-Pulver, insbesondere PE-UHMW-Pulver.According to an advantageous embodiment, the mixture contains between 1% and 50% polyethylene powder, in particular PE-UHMW powder.
Weitere Vorteile und vorteilhafte Weiterbildungen des Gegenstandes nach der Erfindung ergeben sich aus der Beschreibung, der Zeichnung und den Patentansprüchen. ZeichnungFurther advantages and advantageous developments of the subject matter according to the invention result from the description, the drawing and the patent claims. drawing
Vier Ausführungsbeispiele des Wischerblattes nach der Erfindung einer Scheibenwischervorrichtung eines Kraftfahrzeuges sind in der Zeichnung schematisch vereinfacht dargestellt und werden in der nachfolgenden Beschreibung näher erläutert. Es zeigen.Four exemplary embodiments of the wiper blade according to the invention of a windshield wiper device of a motor vehicle are shown schematically in simplified form in the drawing and are explained in more detail in the description below. Show it.
Figur 1 eine Prinzipdarstellung eines Wischerblattes im Querschnitt ;Figure 1 is a schematic representation of a wiper blade in cross section;
■ Figur 2 eine Querschnittsdarstellung einer zweiten Ausführungsform eines Wischerblattes; ■ Figure 2 is a cross-sectional view of a second embodiment of a wiper blade;
Figur 3 eine dritte Ausfuhrungsform eines Wischerblattes im Querschnitt;Figure 3 shows a third embodiment of a wiper blade in cross section;
Figur 4 eine vierte Ausfuhrungsform eines Wischerblattes.Figure 4 shows a fourth embodiment of a wiper blade.
Beschreibung der AusführungsbeispieleDescription of the embodiments
In Figur 1 ist ein Wischerblatt dargestellt, das aus einer eine Wischkante 5 aufweisenden Wischlippe 2 aus Gumrnimate- rial, einem hier nur teilweise dargestellten Kopfteil 3 aus Gummimaterial und einem sogenannten Umlegesteg 4 aus Gummimaterial besteht, der zwischen dem Kopfteil 3 und der Wischlippe 2 angeordnet ist .FIG. 1 shows a wiper blade which consists of a wiper lip 2 made of rubber material, which has a wiper edge 5, a head part 3 made of rubber material, which is only partially shown here, and a so-called folding web 4 made of rubber material, which is arranged between the head part 3 and the wiper lip 2 is.
Die Wischlippe 2 , das Kopfteil 3 und der Umlegesteg 4 sind mit einer Oberfläche versehen, die aus einer Polyethylen- schicht 1 gebildet ist, die in Figur 1 der Anschaulichkeit halber im Vergleich zu der Wischlippe 2, dem Kopfteil 3 und dem Umlegesteg 4 vergrößert dargestellt ist. Die Polyethy- lenschicht 1 besteht vorliegend aus PE-UHMW, d. h. aus Polyethylen mit ultrahohem Molekulargewicht .The wiper lip 2, the head part 3 and the folding web 4 are provided with a surface which is formed from a polyethylene layer 1 which, for the sake of clarity, is compared to the wiper lip 2, the head part 3 and the transfer bridge 4 is shown enlarged. In the present case, the polyethylene layer 1 consists of PE-UHMW, ie of ultra-high molecular weight polyethylene.
Das Wischerblatt nach Figur 1 ist derart hergestellt, daß zunächst teilweise vulkanisiertes Gummimaterial in einem Extruder mittels eines Werkzeuges in Wischerblattform gepreßt, dann mit PE-UHMW-Pulver bestäubt und anschließend vulkanisiert wird. Die Bedingungen bei der Vulkanisation entsprechend üblichen Vulkanisationsbedingungen.The wiper blade according to FIG. 1 is produced in such a way that first partially vulcanized rubber material is pressed in an extruder by means of a tool in the form of a wiper blade, then dusted with PE-UHMW powder and then vulcanized. The vulcanization conditions correspond to the usual vulcanization conditions.
Die Materialbeschaffenheit der Wischgummilippe ist im Ergebnis derart, daß bei einer Messung, bei der das Wischerblatt 1 an einer rotierenden Glasplatte anliegt und Wischgeschwindigkeiten sowie Andruckverhältnisse wie bei einem Kraftfahrzeug vorliegen, Trockenreibwerte μtr zwischen 0,32 und 0,48 erreicht werden können.As a result, the material properties of the wiper rubber lip are such that, in a measurement in which the wiper blade 1 is in contact with a rotating glass plate and wiping speeds and pressure conditions are present as in a motor vehicle, dry friction values μ tr between 0.32 and 0.48 can be achieved.
Das in Figur 2 dargestellte Ausführungsbeispiel eines Wischerblattes umfaßt im wesentlichen die gleichen Bestandteile wie das Wischerblatt nach Figur 1. Das Wischerblatt nach Figur 2 unterscheidet sich jedoch von demjenigen nach Figur 1 durch eine sogenannte Wischkante 5, welche frei von Polyethylen ist.The exemplary embodiment of a wiper blade shown in FIG. 2 essentially comprises the same components as the wiper blade according to FIG. 1. However, the wiper blade according to FIG. 2 differs from that according to FIG. 1 by a so-called wiper edge 5, which is free of polyethylene.
Das in Figur 3 dargestellte Ausführungsbeispiel einer Wischerblattes umfaßt ebenfalls im wesentlichen die gleichen Bestandteile wie das Ausführungsbeispiel nach Figur 1, unterscheidet sich jedoch von letzterem dadurch, daß die an. der Wischlippe 2 ausgebildete Wischkante 5, der Umlegesteg 4 und das Kopfteil 3 frei von Polyethylen sind und die Wischlippe 2 nur in seinen an die Wischkante 5 angrenzenden, lateralen Bereichen, d. h. nur teilweise mit Polyethylen beschichtet ist.The embodiment of a wiper blade shown in Figure 3 also includes essentially the same components as the embodiment of Figure 1, but differs from the latter in that the. the wiper lip 2 formed wiping edge 5, the folding bridge 4 and the head part 3 are free of polyethylene and the Wiper lip 2 is coated only in its lateral areas adjacent to the wiping edge 5, ie is only partially coated with polyethylene.
Das in Figur 4 dargestellte Ausführungsbeispiel zeigt ein Wischerblatt, das im wesentlichen ein nur teilweise dargestelltes Kopfteil 3 aus Gummimaterial, eine sich an das Kopfteil 3 anschließenden Umlegesteg 4 aus Gummimaterial und eine Wischlippe 6 mit einer Wischkante 5 umfaßt. Die Wischlippe 6 besteht aus Gummimaterial, in welchen Polyethylen in Form von PE-UHMW eingebettet ist. Die Wischlippe 6 ist aus einem Ausgangsmaterial hergestellt, das etwa 40 % Polyethylen enthält.The exemplary embodiment shown in FIG. 4 shows a wiper blade which essentially comprises a head part 3 made of rubber material, only partially shown, a folding web 4 made of rubber material adjoining the head part 3 and a wiper lip 6 with a wiper edge 5. The wiper lip 6 consists of rubber material, in which polyethylene in the form of PE-UHMW is embedded. The wiper lip 6 is made from a starting material that contains about 40% polyethylene.
Der Wischgummi ist vorliegend ein Extrusionsteil . Alternativ kann der Wischgummi auf bekannte Weise auch nach einem Extrusionsverfahren oder durch Compression molding hergestellt sein. In the present case, the squeegee is an extrusion. Alternatively, the squeegee can also be produced in a known manner by an extrusion process or by compression molding.

Claims

Ansprüche Expectations
1. Wischerblatt für einen Scheibenwischer, insbesondere einen Scheibenwischer eines Kraftfahrzeuges, mit einem Wischgummi, der eine Wischgummilippe (2, 6) aufweist, dadurch gekennzeichnet, daß die Wischgummilippe (2, 6) teilweise aus Polyethylen gefertigt ist.1. Wiper blade for a windshield wiper, in particular a windshield wiper of a motor vehicle, with a wiper rubber that has a wiper rubber lip (2, 6), characterized in that the wiper rubber lip (2, 6) is partially made of polyethylene.
2. Wischerblatt nach Anspruch 1, dadurch gekennzeichnet, daß die Wischgummilippe (2) mit Polyethylen (1) beschichtet ist.2. Wiper blade according to claim 1, characterized in that the wiper rubber lip (2) is coated with polyethylene (1).
3. Wischerblatt nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß sich an die Wischgummilippe (2) über einem Umlegesteg (4) ein Kopfteil (3) anschließt und daß die Wischgummilippe (2), der Umlegesteg (4) "und das Kopfteil (3) mit Polyethylen (1) beschichtet sind.3. Wiper blade according to claim 1 or 2, characterized in that a head part (3) adjoins the wiper rubber lip (2) via a folding web (4) and that the wiper rubber lip (2), the folding web (4) " and the head part ( 3) are coated with polyethylene (1).
4. Wischerblatt nach einem der Ansprüche 1 bis 3 , dadurch gekennzeichnet, daß die Wischgummilippe (2) teilweise mit Polyethylen (1) beschichtet ist. 4. Wiper blade according to one of claims 1 to 3, characterized in that the wiper rubber lip (2) is partially coated with polyethylene (1).
5. Wischerblatt nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Wischgummilippe (6) im Volumen Polyethylen enthält.5. Wiper blade according to one of claims 1 to 4, characterized in that the wiper rubber lip (6) contains polyethylene in volume.
6. Wischerblatt nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Polyethylen ein PE-UHMW darstellt .6. Wiper blade according to one of claims 1 to 5, characterized in that the polyethylene is a PE-UHMW.
7. Wischerblatt nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Polyethylen ein PE-HD darstellt.7. Wiper blade according to one of claims 1 to 5, characterized in that the polyethylene is a PE-HD.
8. Wischerblatt nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Polyethylen ein PE-X darstellt.8. Wiper blade according to one of claims 1 to 5, characterized in that the polyethylene is a PE-X.
9. Verfahren zur Herstellung eines Wischerblatts für einen Scheibenwischer, das einen Wischgummi mit einer Wischgummilippe umfaßt, dadurch gekennzeichnet, daß die Wischgummilippe durch Vulkanisieren eines Gummimaterials zusammen mit Polyethylen hergestellt wird.9. A method for producing a wiper blade for a windshield wiper, which comprises a squeegee with a squeegee lip, characterized in that the squeegee lip is produced by vulcanizing a rubber material together with polyethylene.
10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, daß das Polyethylen als Ausgangsstoff pulverförmig ist und eine Korngröße kleiner 30μm aufweist.10. The method according to claim 9, characterized in that the polyethylene as a starting material is powdery and has a grain size less than 30 microns.
11. Verfahren nach Ansprüche 9 oder 10, dadurch gekennzeichnet, daß das Gummimaterial vor dem Vulkanisieren mit dem Polyethylen beschichtet wird. 11. The method according to claims 9 or 10, characterized in that the rubber material is coated with the polyethylene before vulcanization.
12. Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß das Gummimaterial mit einer Polyethylen-Partikel enthaltenden Dispersion beschichtet wird.12. The method according to claim 11, characterized in that the rubber material is coated with a dispersion containing polyethylene particles.
13. Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß das Polyethylen nach einem elektrostatischen Pulverbe- schichtungsverfahren auf das Gummimaterial aufgebracht wird.13. The method according to claim 11, characterized in that the polyethylene is applied to the rubber material by an electrostatic powder coating process.
14. Verfahren nach- Anspruch 11, dadurch gekennzeichnet, daß . das Polyethylen mittels eines Wirbelbetts auf das Gummimaterial aufgebracht wird.14. The method according to claim 11, characterized in that. the polyethylene is applied to the rubber material using a fluidized bed.
15. Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß das Gummimaterial und das Polyethylen nach einem Coex- trusionsverfahren miteinander verbunden werden.15. The method according to claim 11, characterized in that the rubber material and the polyethylene are joined together by a coextrusion process.
16. Verfahren nach einem der Ansprüche 11 bis 15, dadurch gekennzeichnet, daß das mit Polyethylen beschichtete Gummimaterial Spülluft ausgesetzt wird.16. The method according to any one of claims 11 to 15, characterized in that the polyethylene-coated rubber material is exposed to purging air.
17. Verfahren nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß die Wischgummilippe aus einer Mischung hergestellt wird, die das Gummimaterial und das Polyethylen umfaßt .17. The method according to claim 9 or 10, characterized in that the wiper rubber lip is made from a mixture comprising the rubber material and the polyethylene.
18. Verfahren nach Anspruch 17, dadurch gekennzeichnet, daß die Mischung zwischen 1% und -50% Polyethylen-Pulver enthält . 18. The method according to claim 17, characterized in that the mixture contains between 1% and -50% polyethylene powder.
EP02732391A 2001-05-23 2002-04-12 Wiper blade Ceased EP1395470A1 (en)

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DE2001125045 DE10125045A1 (en) 2001-05-23 2001-05-23 wiper blade
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EP2048048A2 (en) 2009-04-15
CZ300569B6 (en) 2009-06-17
CN1676310A (en) 2005-10-05
PL209748B1 (en) 2011-10-31
ES2493625T3 (en) 2014-09-12
CN1511094A (en) 2004-07-07
EP2048048A3 (en) 2009-05-13
CZ20033192A3 (en) 2004-04-14
US20040148728A1 (en) 2004-08-05
WO2002094624A1 (en) 2002-11-28
EP1522472B1 (en) 2014-06-11
JP2004525032A (en) 2004-08-19
CN100418813C (en) 2008-09-17
BR0209978B1 (en) 2011-05-31
CN100523063C (en) 2009-08-05
WO2002094624A8 (en) 2004-01-29
PL366743A1 (en) 2005-02-07
DE10125045A1 (en) 2002-12-05
EP1522472A3 (en) 2006-08-09
BR0209978A (en) 2004-04-06
EP1522472A2 (en) 2005-04-13
KR20040002978A (en) 2004-01-07

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