DE102012205550A1 - Method for producing wiper blade rubber, involves vulcanizing wiper rubber-double strand after extruding wiper rubber-double strand, or is aligned in such way that one wiper lip section is placed above another wiper lip section - Google Patents

Abstract

The method involves extruding a wiper rubber-double strand (20). The cross-sectional form of the wiper rubber-double strand corresponds to the cross-sectional form of two wiper rubbers (10,10'), which have a wiper lip section (11) connected with a fastening section (13) over a tilting web section. The wiper rubber-double strand is vulcanized after extruding the wiper rubber-double strand, or is aligned in such a way that the wiper lip section is placed above another wiper lip section (11') of the wiper rubber-double strand.

Description

The present invention relates to a process for the production of wiper rubbers, a correspondingly produced squeegee and a wiper equipped therewith.

State of the art

It is known to produce squeegees for windshield wipers by extrusion of a squeegee double strand whose cross-sectional shape corresponds to the cross-sectional shape of two squeegees, each having a wiper lip portion which is connected via a Kippstegabschnitt with a mounting portion, and which are connected to each other via the two wiper lip portions.

After extrusion, squeegee duplexes are usually vulcanized in a liquid salt bath. During extrusion and vulcanization, the wiper-rubber double strand is usually oriented such that the interconnected wiper lip sections as well as the associated tilting webs and fastening sections are located next to one another.

When exiting the extruder and at the beginning of vulcanization, however, the squeegee double strand still has a low dimensional stability. Therefore, prior to the entry into the liquid salt bath, lateral deformations of the wiper blade double strand, in particular the wiper lip sections and the tilting web sections, which are caused by the force of gravity, can occur. These lateral deformations due to gravity can be superimposed in the salt bath by further lateral deformations due to buoyancy forces.

The publication WO 2010/083909 A1 suggests to reduce such lateral deformations in that the widest portion of the wiper lip portions has the same width as the largest width of the attachment portions.

The publication WO 2011/072749 A1 describes a method in which a strand-like extrudate is first transported in a vertical direction through a heat treatment medium.

Disclosure of the invention

• a) Extrudieren eines Wischgummi-Doppelstrangs, wobei die Querschnittsform des Wischgummi-Doppelstrangs der Querschnittsform von zwei Wischgummis entspricht, die jeweils einen Wischlippenabschnitt aufweisen, welcher über einen Kippstegabschnitt mit einem Befestigungsabschnitt verbundenen ist, und die über die beiden Wischlippenabschnitte miteinander verbunden sind, und
• b) Vulkanisieren des Wischgummi-Doppelstrangs, wobei der Wischgummi-Doppelstrang in Verfahrensschritt a) derart extrudiert wird, und/oder zumindest in der Anfangsphase von Verfahrensschritt b) derart ausgerichtet ist, dass sich der eine Wischlippenabschnitt oberhalb des anderen Wischlippenabschnitts befindet.

The present invention is a process for producing wiper rubbers, in particular for windscreen wipers, for example for vehicle windscreen wipers, comprising the process steps:

• a) extruding a squeegee double strand, wherein the cross-sectional shape of the squeegee double strand corresponds to the cross-sectional shape of two wiper rubbers, each having a wiper lip portion which is connected via a Kippstegabschnitt with a mounting portion, and which are interconnected via the two wiper lip portions, and
• b) vulcanizing the squeegee double strand, wherein the squeegee double strand is extruded in step a), and / or at least in the initial phase of step b) is aligned such that there is a wiper lip section above the other wiper lip section.

Characterized in that the two wiper lip sections are arranged one above the other and not next to each other, can advantageously gravity-induced and / or buoyancy-related lateral deformations of the wiper lip portions and the tilting ribs can be prevented. In this case, advantageously neither the shape of the squeegee double strand and thus the wiping rubber to be produced is limited in any way, nor is a high and complex design of the vulcanizing necessary. In that lateral deformations are prevented, the wiping behavior and the wiping quality of the wiper rubbers produced can in turn advantageously be improved.

Process step b) can be carried out in particular in a vulcanizing device which comprises, for example, a heat treatment medium, for example a liquid salt bath. The liquid salt bath may, for example, be a melt containing, for example, a mixture of potassium nitrate and / or sodium nitrate and / or sodium nitrite and / or lithium nitrite. Process step b) can be carried out, for example, at a temperature in a temperature range from ≥ 150 ° C to ≦ 300 ° C.

Since the dimensional stability of the squeegee double strand increases with the progress of the vulcanization reaction, other orientations of the squeegee double strand are possible beyond a certain progress of the vulcanization reaction. For example, it is possible to divert the squeegee double strand after a certain, in particular dependent on the material selection and / or process control, route, for example, to minimize the size of the vulcanizing.

Optionally, however, the wiper-rubber double strand can also be aligned during the entire process step b) in such a way that a wiper lip section is located above the other wiper lip section.

In one embodiment, the squeegee double strand is extruded in step a), and / or the squeegee double strand is at least in the initial phase of step b) aligned such that extending through the wiper lip sections, Kippstegabschnitte and mounting portions of the squeegee double strand Axis is at least substantially perpendicular or vertical.

In this case, it can be understood to mean essentially perpendicularly that during the extrusion and / or a short section of the initial phase of method step b), for example during the immersion of the squeegee double strand in the heat treatment medium, for example a liquid salt bath, for example by + / -45 degrees, can deviate from the vertical or vertical, in particular gravitational direction (see 9 ).

In a special embodiment of this embodiment, the squeegee double strand is extruded in step a), and / or the squeegee double strand in the initial phase of step b), optionally also during the entire process step b) aligned such that a by the wiper lip sections, Kippstegabschnitte and mounting portions of the squeegee double strand extending axis is vertical or vertical (see 8th and 4 ).

While the wiper lip portions, rocker land portions, and mounting portions of the squeegee duplex are in such a substantially vertical / vertical, particularly vertical / vertical, orientation, the squeegee duplex may be moved in a substantially horizontal (extrusion / movement) direction. For example, the wiper blade double strand, in particular during the axis extending through the wiper lip sections, Kippstegabschnitte and mounting portions of the squeegee double strand at least substantially perpendicular / vertical, in particular vertical / vertical, directly in an at least substantially horizontal (extrusion / movement -) direction extruded into the vulcanizing or extruded, in particular in an at least substantially horizontal (extrusion) direction and, after extruding in an at least substantially horizontal (movement) direction led into the vulcanizing and optionally after vulcanization also back in an at least substantially horizontal (movement) direction are led out of the vulcanizing (see 4 . 8th and 9 ).

Within the scope of a further embodiment, the wiper blade double strand is extruded and / or, in particular directly, after extrusion and / or at least in the initial phase of process step b), optionally also during the complete process step b), essentially in horizontal (motion -) Direction, for example, by the vulcanizing, especially the salt bath, moves. For example, the squeegee duplex may be moved substantially in the horizontal (moving) direction immediately after being extruded, or directly following the extrusion. For example, the squeegee double strand can be moved directly after the extrusion or directly after the extrusion and at least in the initial phase of process step b) substantially in the horizontal (movement) direction. In particular, the squeegee double strand can be moved directly in the horizontal (movement) direction directly after the extrusion or directly after the extrusion. For example, the wiper blade double strand can be moved during the extrusion and directly after the extrusion or directly after the extrusion and at least in the initial phase of step b) substantially in the horizontal (movement) direction.

It can be understood, for example, that the squeegee double strand is moved in a horizontal (movement) direction as well as, for example, deflected once or twice, into two or more more horizontal (motion) directions can be moved. In particular, at the beginning and at the end of method step b), in particular when immersing and removing the squeegee double strand in or from the heat treatment medium / salt bath, deviations, for example by +/- 45 ° C, from the horizontal are possible (see 9 ).

For example, in that the squeegee double strand extruded directly in a horizontal (extrusion / movement) direction in the vulcanizing or after extruding in a horizontal (movement) direction in the vulcanizing ushered, in particular in a horizontal (extrusion / movement -) Direction extruded and led after extrusion in a horizontal (movement) direction in the vulcanizing, and optionally after vulcanization also again in a horizontal (moving) direction out of the vulcanizing out (see 8th and 4 ), it can also be realized that the squeegee double strand is moved only in the horizontal (movement) direction or exclusively in horizontal (movement) directions.

Within the scope of a further embodiment, the wiper blade double strand is taken up by a guiding and / or transport system after the extrusion, in particular in method step a). Optionally, the wiper blade double strand can be taken up by the guiding and / or transport system directly after the extrusion, in particular in method step a). The guiding and / or transport system can be designed to guide or transport the squeegee double strand or both to lead and to transport. By the guiding and / or transport system, the squeegee double strand can be advantageously kept in the desired (vertical) position.

As part of a preferred embodiment of this embodiment, the guide and / or transport system is designed to keep the two attachment portions of the squeegee double strand at a constant distance from each other. In this way, advantageously, the shape or dimensioning of the squeegee double strand can be kept constant and avoided in particular gravity and buoyancy-related vertical deformations and thus the wiping behavior and the wiping quality of the wiper blades to be produced are further improved.

As part of a special embodiment of this embodiment, the guide and / or transport system on a first and a second guiding and / or transport device. The first guiding and / or transporting device may in particular be designed to receive the one attachment section of the squeegee double strand and wherein the second guiding and / or transport device is adapted to receive the other attachment section of the squeegee double strand. In this case, the first and second guiding and / or transporting devices are preferably designed to keep the two fastening sections of the wiper-rubber double strand at a constant distance from one another.

In particular, the guiding and / or transporting devices may each comprise at least one pair of guiding and / or transporting devices. The guiding and / or transport devices of a pair can be designed, in particular, to receive opposite regions of a fastening section of the wiper-rubber double strand.

The guiding and / or transporting devices can in particular be designed in each case in the form of a, for example substantially U-shaped, gripping mechanism and / or a, for example substantially U-shaped, guide rail.

Within the scope of a further embodiment, the method further comprises the method step: c) separating the squeegee double strand into at least two individual squeegee rubbers. On the one hand, the wiper-rubber double strand, in particular horizontally, can be separated between the two wiper-lip sections. On the other hand, in this case the wiper-rubber double strand, in particular several times, is separated perpendicularly to the longitudinal extent of the wiper-rubber double strand, for example to produce a plurality of wiper-rubbers.

With regard to further technical features and advantages of the method according to the invention, reference is hereby explicitly made to the explanations in connection with the squeegee and wiper according to the invention and with the figures.

Further objects of the present invention are a squeegee made by a method according to the invention and a windshield wiper comprising such a squeegee.

With regard to further technical features and advantages of the wiper rubber and windscreen wiper according to the invention, reference is hereby explicitly made to the explanations in connection with the method according to the invention and with the figures.

drawings

Further advantages and advantageous embodiments of the subject invention are illustrated by the drawings and explained in the following description. It should be noted that the drawings have only descriptive character and are not intended to limit the invention in any way. Show it

1 a schematic cross section through a double squeegee rubber in an embodiment of the manufacturing method according to the invention;

2 a schematic cross section through a double squeegee rubber in another embodiment of the manufacturing method according to the invention;

3 a schematic cross section through a squeegee double strand in a conventional manufacturing process;

4 a schematic cross section through a system in an embodiment of the manufacturing method according to the invention;

5 a schematic plan view of a system in a special embodiment of in 4 shown embodiment of the manufacturing method according to the invention;

6 a schematic plan view of a system in a further specific embodiment of in 4 shown embodiment of the manufacturing method according to the invention;

7 a schematic plan view of a system in a further embodiment of the manufacturing method according to the invention;

8th a schematic cross section through the in 7 shown plant; and

9 a schematic cross section through a system in a further embodiment of the manufacturing method according to the invention.

1 shows a double squeegee rubber 20 , whose cross-sectional shape of the cross-sectional shape of two wiper blades 10 . 10 ' corresponds, each having a wiper lip section 11 . 11 ' which has a Kippstegabschnitt 12 . 12 ' with a fixing section 13 . 13 ' connected, and the two wiper lip sections 11 . 11 ' connected to each other. Such a squeegee double strand 20 is extruded in the process of the invention, first in process step a) and later vulcanized in process step b). The dashed line between the two wiper lip sections 11 . 11 ' indicates that such a double squeegee rubber 20 in a later method step c) horizontally between the two wiper lip sections 11 . 11 ' can be cut to two squeegees 10 . 10 ' and in particular by additional separations in a vertical parting plane a plurality of wiper blades 10 . 10 ' manufacture.

1 shows in particular that the squeegee double strand 20 is aligned such that the one wiper lip section 11 above the other wiper lip section 11 ' of the squeegee double strand 20 located. In particular, there is also a Kippstegabschnitt 12 above the other Kippstegabschnitts 12 ' and in particular also above the two wiper lip sections 11 . 11 ' , Also the one attachment section 13 located above the other attachment section 13 ' and in particular also above the two Kippstegabschnitte 12 . 12 ' and wiper lip sections 11 . 11 ' ,

In other words, the squeegee double strand 20 is oriented such that the broad side of the squeegee double strand 20 vertically and the narrow side of the squeegee double strand 20 is aligned horizontally.

1 illustrates that while the squeegee double strand 20 is in particular oriented such that through the wiper lip sections 11 . 11 ' , Kippstegabschnitte 12 . 12 ' and fastening sections 13 . 13 ' of the squeegee double strand 20 extending axis z is vertical or vertical.

Within the scope of the illustrated embodiment of the method according to the invention, the wiper-rubber double strand is in this special orientation in method step a) by means of an extruder 23 extruded and in at least an initial stage of process step b) in a vulcanizer 21 (please refer 4 to 9 ) vulcanized. Thus, advantageously, gravity and buoyancy-related lateral deformations l can be avoided, which take place without additional precautions in wiper-rubber double strands 20 can occur, which are produced by conventional methods, in which - as in 3 illustrated - the wiper lip sections 11 . 11 ' , Kippstegabschnitte 12 . 12 'and mounting sections 13 . 13 ' are arranged side by side or in which the broad side of the squeegee double strand 20 horizontally and the narrow side of the squeegee double strand 20 is vertically aligned.

1 illustrates that by the inventive alignment of the squeegee double strand 20 , which maintains significant lateral symmetry for wiping behavior and wiping quality.

1 further shows an embodiment of a guidance and / or transport system 22 . 22 ' , which is designed to the squeegee double strand 20 , in particular its fastening sections 13 . 13 ', after the extrusion take and thereby the two fastening sections 13 . 13 ' to keep at a constant distance d.

Thereby, that the two fastening sections 13 . 13 ' through the guidance and / or transport system 22 . 22 ' be kept at a constant distance d, advantageously also vertical deformation v can be largely avoided. The arrows illustrate that although slight vertical deformations v, which For example, a difference between the strip 13a of the upper attachment section 13 and the squeeze bar 13a ' of the lower attachment portion 13 ' can lead may occur, which, however, advantageously affect the wiping and wiping quality advantageously.

1 further shows that the guiding and / or transport system 22 . 22 ' a first 22 and a second 22 ' Having guiding and / or transport device. The first guiding and / or transporting device 22 is designed to be the one attachment section 13 of the squeegee double strand 20 to receive, wherein the second guiding and / or transport device 22 ' is designed to the other attachment portion 13 ' of the squeegee double strand 20 take. 1 illustrates that while the guiding and / or transport devices 22 . 22 ' each a pair of management and / or transport facilities 22a . 22b ; 22a ' . 22b ' having. Here are the management and / or transport facilities 22a . 22b ; 22a ' . 22b ' a pair each adapted to opposite portions of a fastening portion 13 . 13 ' of the squeegee double strand 20 take.

As part of the in 1 embodiment shown are the guiding and / or transport devices 22a . 22b ; 22a ' . 22b ' each formed in the form of a substantially U-shaped guide rail. In these guide rails 22a . 22b ; 22a ' . 22b ' can the squeegee double strand 20 directly extruded or received after extrusion and therein by the vulcanization 21 be guided.

In the 2 The embodiment shown differs essentially from that in FIG 1 shown embodiment that the management and / or transport facilities 22a . 22b ; 22a ' . 22b ' each in the form of a gripping mechanism 22a . 22c ; 22b . 22d ; 22a ' . 22c ' . 22b ' . 22c ' are formed. These gripping mechanisms 22a . 22c ; 22b . 22d ; 22a ' . 22c ' . 22b ' . 22c ' can use the squeegee double strand 20 after extruding and through the vulcanization device 21 transport. The gripping mechanisms 22a . 22c ; 22b . 22d ; 22a ' . 22c ' . 22b ' . 22c ' can be transported or driven and operated via a chain or belt mechanism. In the 4 . 5 and 6 different embodiments are illustrated how such chain or belt mechanisms can be configured.

3 shows a schematic cross section through a, produced by a conventional method squeegee double strand 20 and shows that insofar the wiper lip sections 11 . 11 ' , Kippstegabschnitte 12 . 12 ' and fastening sections 13 . 13 ' are aligned side by side or insofar as the thereby extending axis during extrusion and vulcanization is substantially horizontal or horizontal, a gravity and buoyancy-related lateral deformation l in particular the wiper lip sections 11 . 11 ' and Kippstegabschnitte 12 . 12 ' can result, which the wiping behavior and the wiping quality of the wiping rubbers to be produced 10 . 10 ' can significantly worsen.

4 shows a schematic cross section through a plant for carrying out a specific embodiment of the manufacturing method according to the invention. 4 illustrates that while the squeegee double strand 20 after extruding from an extruder 23 and when vulcanizing in a vulcanizer 21 with a liquid salt bath 21a in a horizontal (extrusion / movement) direction x is moved. This is the wiper rubber double strand 20 horizontally through a wall of the salt bath 21a guided.

4 shows that the squeegee double strand 20 doing so immediately after leaving an extruder 23 from a guidance and / or transport system 22 . 22 ' is recorded, which is an upper 22 and a lower one 22 ' Guiding and / or transport device comprises. The guiding and / or transport devices 22 . 22 ' each include two management and / or transport facilities 22a . 22b . 22a ' . 22b ' of which, however, only the front is visible in the representation. The arrows illustrate that the guiding and / or transporting devices 22a . 22b . 22a ' . 22b ' each on a chain or belt-based gripping mechanism 22a . 22c ; 22b . 22d ; 22a ' . 22c ' . 22b ' . 22c ' which can be realized for example by a chain or a band from above 22a ; 22c ' and a chain or a band from below 22c ; 22a ' against the respective area of a fastening section to be received 13 . 13 ' pressed and then moved further in the direction of the arrow, with the recorded between them wiper rubber double strand 20 is transported in the direction x.

It is both possible - as in 5 shown - the upper chains or bands 22a . 22b ; 22c ' . 22d ' from above and the lower chains or bands 22c . 22d ; 22a ' 22b ' (not visible in 5 ) from below as well as - as in 6 shown - the upper chains or bands 22a . 22b ; 22c ' . 22d ' and lower chains or bands 22c . 22d ; 22a ' . 22b ' (not visible in 6 ) to be supplied laterally.

The 7 and 8th show that the squeegee double strand 20 also directly into a guidance and / or transport system 22 . 22 'can be extruded, which two upper 22a . 22b and two lower ones 22a ' . 22b ' Includes guide rails.

9 shows a schematic cross section through a plant for carrying out another specific embodiment of the manufacturing method according to the invention. 9 illustrates that while the squeegee double strand 20 after extruding from an extruder 23 have to overcome a height difference to get in on a liquid salt bath 21a based vulcanizer 21 to get. The squeegee double strand 20 is aligned such that the one wiper lip section 11 above the other wiper lip section 11 ' located. To the height difference between the extruder 23 and the salt bath 21a to be able to overcome, stands through the wiper lip sections 11 . 11 ' , Kippstegabschnitte 12 . 12 ' and fastening sections 13 . 13 ' of the squeegee double strand 20 extending axis z when immersed in the salt bath 21a only substantially vertical. Advantageously, however, this does not cause any lateral deformations l. A slight axial deformation extends over the entire length of the squeegee double strand due to the continuous transport direction x, which is the design of the nozzle of the extruder 23 can be considered and compensated and advantageously does not affect the wiping and wiping quality.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2010/083909 A1 [0005]
• WO 2011/072749 A1 [0006]

Claims (12)

Process for producing wiper rubbers, in particular for windscreen wipers, comprising the process steps of: a) extruding a squeegee double strand ( 20 ), wherein the cross-sectional shape of the squeegee double strand ( 20 ) the cross-sectional shape of two wiper blades ( 10 . 10 ' ), each having a wiper lip section ( 11 . 11 ' ), which via a Kippstegabschnitt ( 12 . 12 ' ) with a fastening section ( 13 . 13 '), and which is connected via the two wiper lip sections ( 11 . 11 ') are connected together, and b) vulcanizing the squeegee double strand ( 20 ), wherein the squeegee double strand ( 20 ) is extruded in step a), and / or at least in the initial phase of step b) is aligned such that the one wiper lip section ( 11 ) above the other wiper lip section ( 11 ' ) of the squeegee double strand ( 20 ) is located. The method of claim 1, wherein the squeegee doublet ( 20 ) is extruded in step a), and / or at least in the initial phase of step b) is aligned such that through the wiper lip sections ( 11 . 11 ' ), Kippstegabschnitte ( 12 . 12 ' ) and fastening sections ( 13 . 13 ' ) of the squeegee double strand ( 20 ) extending axis (z) is at least substantially perpendicular. Method according to claim 1 or 2, wherein the squeegee double strand ( 20 ) is moved during the extrusion and / or, in particular directly, after the extrusion and / or at least in the initial phase of method step b) substantially in the horizontal direction (x). Method according to one of claims 1 to 3, wherein the vulcanizing device ( 21 ) a heat treatment medium, in particular a liquid salt bath, ( 21a ). Method according to one of claims 1 to 4, wherein the squeegee double strand ( 20 ) after extruding from a guiding and / or transport system ( 22 . 22 ' ) is recorded. Method according to claim 5, wherein the guiding and / or transport system ( 22 . 22 ' ) adapted to the two mounting portions ( 13 . 13 ' ) of the squeegee double strand ( 20 ) at a constant distance (d) to each other. Method according to claim 5 or 6, wherein the guiding and / or transport system ( 22 . 22 ' ) a first ( 22 ) and a second ( 22 ' ) Guiding and / or transporting device, wherein the first guiding and / or transporting device ( 22 ) is adapted to the one attachment section ( 13 ) of the squeegee double strand ( 20 ) and wherein the second guiding and / or transport device ( 22 ' ) is adapted to the other attachment portion ( 13 ' ) of the squeegee double strand ( 20 ). Method according to one of claims 5 to 7, wherein the guiding and / or transport devices ( 22 . 22 ' ) at least one pair of guiding and / or transport devices ( 22a . 22b ; 22a ' . 22b ' ), the management and / or transport facilities ( 22a . 22b ; 22a ' . 22b ' ) of a pair are adapted to opposite areas of a fastening portion ( 13 . 13 ' ) of the squeegee double strand ( 20 ). Method according to one of claims 5 to 8, wherein the guiding and / or transport devices ( 22a . 22b ; 22a ' . 22b ' ) are each formed in the form of a gripping mechanism and / or a guide rail. Method according to one of claims 1 to 9, wherein the method further comprises the method step: c) separating the squeegee double strand ( 20 ) in at least two individual wiper rubbers ( 10 . 10 ' ). A squeegee made by a method according to any one of claims 1 to 10. A windscreen wiper comprising a squeegee according to claim 11.

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