BE1021267B1 - PROCESS FOR MIXTURES PRODUCTION - Google Patents

Abstract

The present invention relates to a process for the production of wiper rubbers, in particular for vehicle windshield wipers, in which, in a process step a), a wiper rubber double strand (20) is extruded, the cross-sectional shape of which corresponds to the cross-sectional shape of two wiper rubbers (10, 10 ') which each have a wiper lip section (11, 11 '), and which are connected to one another via the two wiper lip sections (11, 11') and are vulcanized in a method step b). The double squeegee cord (20) is extruded in process step a), or the double squeegee cord (20) is oriented at least in the initial phase of process step b) such that one wiper lip section (10) is above the other wiper lip section (10 ') of the wiper rubber double strand (20) is located.

Description

Process for the production of wiper rubber

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 interconnected 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 document WO 2010/083909 Al proposes to reduce such lateral deformations in that the widest range of

Wischlippenabschnitte has the same width as the largest width of the mounting portions.

The document WO 2011/072749 Al 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

The present invention is a process for producing wiper rubbers, in particular for windshield 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 squeegees, 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 method step b) is aligned such that there is a wiper lip portion above the other wiper lip portion.

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 of 150 150 ° C to 300 300 ° 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 wiping rubber double strand can also be aligned during the entire process step b) such that the one 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 aligned at least in the initial phase of process step b) such that a through the wiper lip sections, Kippstegabschnitte and mounting portions of the squeegee Double strand extending axis is at least substantially vertical 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, from the vertical or vertical, in particular gravitational direction, can deviate (see Figure 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 wiper blade double strand extending axis is vertical or vertical (see Figure 8 and 4). While the wiper lip portions, rocker land portions, and mounting portions of the squeegee duplex are in such substantially vertical / vertical, particularly vertical / vertical, orientation, the squeegee duplex may be moved in a substantially horizontal (extrusion / movement) direction become. 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 Figures 4, 8 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 (FIG Direction, for example, by the vulcanizing, especially the salt bath, moves. For example, the wiper gum-mi duplex may be moved substantially straight after extrusion or directly following extrusion in the horizontal (moving) direction. 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), especially 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 FIG. 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 is led out (see Figure 8 and 4) can also be realized that the squeegee double strand is moved only in the horizontal (motion) direction or exclusively in horizontal (motion) 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 means of the guiding and / or transport system, the squeegee double strand can advantageously be held in the desired (vertical) position.

In the context of a preferred embodiment of this embodiment, the guiding and / or transport system is designed to keep the two fastening sections of the wiper-rubber 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.

Within the scope of a special embodiment of this embodiment, the guidance and / or transport system has a first and a second guidance and / or transport device. The first guide and / or transport device may in particular be designed to receive the one attachment section of the squeegee double strand and wherein the second guide 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 shows a schematic cross section through a squeegee

Double strand in one embodiment of the production method according to the invention;

2 shows a schematic cross section through a squeegee

Double strand in another embodiment of the manufacturing method according to the invention;

3 is a schematic cross section through a squeegee

Double strand in a conventional manufacturing process; 4 shows a schematic cross section through a system in one embodiment of the Herstellungsverfah invention;

5 shows a schematic plan view of a system in a special embodiment of the embodiment of the production method according to the invention shown in FIG. 4;

6 shows a schematic plan view of a system in a further specific embodiment of the embodiment of the production method according to the invention shown in FIG. 4; FIG. 7 is a schematic plan view of a system in a further embodiment of the production method according to the invention;

FIG. 8 shows a schematic cross section through the system shown in FIG. 7; FIG. and

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

FIG. 1 shows a squeegee double strand 20 whose cross-sectional shape corresponds to the cross-sectional shape of two wiper rubbers 10, 10 ', each having a wiper lip section 11, 11', which is connected to a fastening section 13, 13 'via a tilting web section 12, 12'. and which are connected to one another via the two wiper lip sections 11, 11 '. 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 wiper-rubber double beach 20 can be severed horizontally between the two wiper-lip sections 11, 11' in a later method step c), by two wiper-rubbers 10, 10 'and in particular by additional separations in a vertical parting plane to produce a plurality of wiper blades 10,10 '.

FIG. 1 shows, in particular, that the squeegee double strand 20 is aligned such that the one wiper lip section 11 is located above the other wiper lip section 11 'of the squeegee double strand 20. In particular, there is also a tilting web section 12 above the other tilting web section 12 'and in particular also above the two wiper lip sections 11, 11'. Also, one fastening section 13 is located above the other fastening section 13 'and in particular also above the two tilting web sections 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 is vertically aligned and the narrow side of the squeegee double strand 20 is horizontally oriented.

FIG. 1 illustrates that in this case the wiper-rubber double strand 20 is aligned in particular in such a way that an axis z extending through the wiper lip sections 11, 11 ', tilting web sections 12, 12' and fastening sections 13, 13 'of the wiper-rubber double strand 20 is vertical or vertical ,

In the illustrated embodiment of the method according to the invention, the squeegee double strand is extruded in this special orientation in step a) by means of an extruder 23 and vulcanized in at least one initial phase of process step b) in a vulcanizing device 21 (see Figures 4 to 9). Thus, advantageously, gravity and buoyancy-related lateral deformations 1 can be avoided, which can occur without additional measures in wiper rubber double strands 20, which are produced by conventional methods, in which - as shown in FIG. 3 - the wiper lip sections 11, 11 ', Tilting web sections 12,12 'and mounting portions 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.

FIG. 1 illustrates that the alignment of the wiper blade double strand 20 according to the invention maintains the lateral symmetry which is decisive for the wiping behavior and the wiping quality.

FIG. 1 also shows an embodiment of a guide and / or transport system 22, 22 ', which is designed to handle the

Squeegee double strand 20, in particular its attachment portions 13,13 ', to receive after the extrusion while keeping the two attachment portions 13,13' at a constant distance d.

As a result of the fact that the two fastening sections 13, 13 'are held at a constant distance d by the guiding and / or transport system 22, 22', vertical deformations v can advantageously also be largely avoided. The arrows illustrate that, although slight vertical deformations v, which may for example lead to a difference between the strip 13a of the upper fastening section 13 and the strip 13a 'of the lower fastening section 13', may occur, which advantageously hardly influence the wiping behavior and the wiping quality ,

FIG. 1 further shows that the guiding and / or transport system 22, 22 'has a first 22 and a second 22' guiding and / or transporting device. The first guiding and / or transporting device 22 is designed to receive the one attachment section 13 of the squeegee double strand 20, wherein the second guiding and / or transport device 22 'is adapted to the other attachment section 13' of the squeegee double strand 20 take. FIG. 1 illustrates that the guide and / or transport devices 22, 22 'each have a pair of guide and / or transport devices 22a, 22b; 22a ', 22b'. The guiding and / or transport devices 22a, 22b; 22a ', 22b' of a pair each adapted to receive opposite portions of a mounting portion -13, 13 'of the squeegee double strand 20.

In the context of the embodiment shown in FIG. 1, the guiding and / or transporting 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', the squeegee double strand 20 can be directly extruded or received after extrusion and guided therein by the vulcanization device 21.

The embodiment shown in FIG. 2 differs essentially from the embodiment shown in FIG. 1 in that the guiding and / or transporting devices 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 grasp the squeegee double strand 20 after extrusion and transport it through the vulcanization device 21. The gripping mechanisms 22a, 22c, 22b, 22d, 22a ', 22c', 22b ', 22c' can be transported or driven and operated via a chain or belt mechanism. FIGS. 4, 5 and 6 illustrate different embodiments of how such chain or band mechanisms can be configured.

FIG. 3 shows a schematic cross section through a squeegee double strand 20 produced by means of a conventional method and shows that in this respect the wiper lip sections 11, 11 ', tilting web sections 12, 12' and fastening sections 13, 13 'are aligned next to one another or insofar as they extend thereby Axis during the extrusion and vulcanization is substantially horizontal or horizontal, a gravity and buoyancy caused lateral deformation 1 in particular the wiper lip sections 11,11 'and Kippstegabschnitte 12,12' may result, the wiping behavior and the wiping quality of the wiper blades 10,10 ' can significantly worsen.

FIG. 4 shows a schematic cross section through a system for carrying out a specific embodiment of the production method according to the invention. Figure 4 illustrates that the squeegee doublet 20 is thereby moved after being extruded from an extruder 23 and vulcanized in a vulcanizer 21 with a liquid salt bath 21a in a horizontal (extrusion / movement) direction x. In doing so, the squeegee

Double strand 20 is guided horizontally through a wall of the salt bath 21 a.

FIG. 4 shows that the wiper-rubber double strand 20 is received by a guide and / or transport system 22, 22 'immediately after leaving an extruder 23, which has an upper 22 and a lower 22' guiding and / or transport device includes. The guiding and / or transporting devices 22, 22 'in each case comprise two guiding and / or transporting devices 22a, 22b, 22a', 22b ', of which, however, only the front one is visible in the illustration. The arrows illustrate that the guiding and / or transporting devices 22a, 22b, 22a ', 22b' are each mounted on a chain or belt-based gripping mechanism 22a, 22c; 22b, 22d; 22a ', 22c', 22b ', 22c'. which can be realized, for example, by pressing a chain or a band from above 22a, 22c 'and a chain or a band from below 22c, 22a' against the respective area to be received by a fastening section 13, 13 'and then further into the Arrow direction is moved, wherein the picked up between them wiper rubber double strand 20 is transported in the direction x.

It is both possible - as shown in Figure 5 - the upper chains or bands 22a, 22b, 22c ', 22d' from above and the lower chains or bands 22c, 22d, 22a ', 22b' (not visible in Figure 5). from below and also, as shown in FIG. 6, the upper chains or bands 22a, 22b, 22c ', 22d' and lower chains or bands 22c, 22d; 22a ', 22b' (not visible in FIG ,

FIGS. 7 and 8 show that the squeegee double strand 20 can also be extruded directly into a guiding and / or transport system 22, 22 'comprising two upper 22a, 22b and two lower 22a', 22b 'guide rails.

FIG. 9 shows a schematic cross section through a system for carrying out another specific embodiment of the production method according to the invention. FIG. 9 illustrates that, after extruding from an extruder 23, the squeegee double strand 20 must overcome a height difference in order to reach a vulcanizing device 21 based on a liquid salt bath 21 a. The wiper-rubber double strand 20 is aligned such that the one wiper lip section 11 is above the other wiper lip section 11 '. In order to be able to overcome the height difference between the extruder 23 and the salt bath 21a, the axis z extending through the wiper lip sections 11, 11 ', tilting web sections 12, 12' and fastening sections 13, 13 'of the wiper rubber double strand 20 is immersed in the salt bath 21a only substantially perpendicular. Advantageously, however, this causes no lateral deformations 1. A slight axial deformation extends due to the continuous transport direction x over the entire length of the squeegee double strand, which can be considered and balanced in the design of the nozzle of the extruder 23 and advantageously does not affect the wiping and wiping quality.

Claims (12)

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