CA2198847C - Sealing profile for motor vehicles - Google Patents
Sealing profile for motor vehicles Download PDFInfo
- Publication number
- CA2198847C CA2198847C CA002198847A CA2198847A CA2198847C CA 2198847 C CA2198847 C CA 2198847C CA 002198847 A CA002198847 A CA 002198847A CA 2198847 A CA2198847 A CA 2198847A CA 2198847 C CA2198847 C CA 2198847C
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- CA
- Canada
- Prior art keywords
- sealing
- rubber
- sealing profile
- profile according
- natural 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.)
- Expired - Fee Related
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
- B60J10/00—Sealing arrangements
- B60J10/30—Sealing arrangements characterised by the fastening means
- B60J10/34—Sealing arrangements characterised by the fastening means using adhesives
- B60J10/35—Sealing arrangements characterised by the fastening means using adhesives using adhesive tapes, e.g. double-sided tapes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
- B60J10/00—Sealing arrangements
- B60J10/15—Sealing arrangements characterised by the material
- B60J10/16—Sealing arrangements characterised by the material consisting of two or more plastic materials having different physical or chemical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
- B60J10/00—Sealing arrangements
- B60J10/30—Sealing arrangements characterised by the fastening means
- B60J10/34—Sealing arrangements characterised by the fastening means using adhesives
Abstract
The sealing profile comprises a retaining part of U-shaped cross-section and sealing parts formed thereon. On an inner surface of a bridge of the retaining part there is positioned an elastomeric mixture which can be vulcanised to a permanently elastic, permanently adhesive and open-cell foamed sealing strand. The sealing strand is deformed during the fitting of the sealing profile by a bodywork flange of a motor vehicle. In this way the retaining part provides a reliable seal relative to the flange.
Description
SEALING PROFILE FOR MOTOR VEHICLES
The invention relates to a sealing profile.
In one known sealing profile of this type (DE 28 42 207 A1) alternatively (page 5, column 2) a sticky element of non-vulcanised rubber, for example butyl rubber (page 3, column 3), can be provided on the inside of the bridge. This rubber permits itself to be compressed only with comparative difficulty upon the fitting of the sealing profile on the flange, so that undesirably high push-fitting forces result. Since the element should be unvulcanised, it can first be made to adhere to the inside of the bridge only after the vulcanisation of the sealing profile in an expensive, additional working step. Moreover, this must be carried out before the limbs of the U-shaped retaining part of the sealing profile are bent into their fitting positions. The known element can therefore be used in no case in which the retaining part is given its U-shaped fitting shape either before or in the injection head of the extruder.
A similar proposal is known from DE 32 27 885 A1, Fig. 3.
Here, a chamber of the retaining part which has previously been vulcanised in the customary way is lined with an evidently pasty butyl rubber part. The specification describes the disadvantages of this structure in the paragraph bridging pages 6 and 7. The known flange covering cannot be further used after an adjustment, since the chamber is smeared with the paste.
From DE 31 47 801 A1 there is known a profile strip for p2198847
The invention relates to a sealing profile.
In one known sealing profile of this type (DE 28 42 207 A1) alternatively (page 5, column 2) a sticky element of non-vulcanised rubber, for example butyl rubber (page 3, column 3), can be provided on the inside of the bridge. This rubber permits itself to be compressed only with comparative difficulty upon the fitting of the sealing profile on the flange, so that undesirably high push-fitting forces result. Since the element should be unvulcanised, it can first be made to adhere to the inside of the bridge only after the vulcanisation of the sealing profile in an expensive, additional working step. Moreover, this must be carried out before the limbs of the U-shaped retaining part of the sealing profile are bent into their fitting positions. The known element can therefore be used in no case in which the retaining part is given its U-shaped fitting shape either before or in the injection head of the extruder.
A similar proposal is known from DE 32 27 885 A1, Fig. 3.
Here, a chamber of the retaining part which has previously been vulcanised in the customary way is lined with an evidently pasty butyl rubber part. The specification describes the disadvantages of this structure in the paragraph bridging pages 6 and 7. The known flange covering cannot be further used after an adjustment, since the chamber is smeared with the paste.
From DE 31 47 801 A1 there is known a profile strip for p2198847
2 sealing round the borders of windows. The receiving groove for the window is made in an EPDM profile. Since EPDM has very weak adhesive properties, a very thin surface layer of an adhesive-friendly rubber mixture is vulcanised onto the material in the receiving groove, with this rubber mixture being polar but not self-adhesive. For the assembly, rather a polar adhesive which sticks on the other hand to the window is additionally applied to the surface layer.
From DE 41 21 552 A1 it is known to conceal the visible surface of the retaining part with a strip of textile. For this, a first adhesive layer is coextruded onto the visible surface. The strip of textile is overlaid with a second adhesive layer of thermoplastic resin. For the concealment, the two adhesive layers are connected to one another by the application of pressure and heat.
From DE 33 46 070 A1 it is known to provide at least one limb of the U-shaped clamping region of the sealing profile with a pivotable extension of elastomeric material. The inner face of this which faces the flange is coated with a layer of adhesive. Upon the fitting, the extension is pivoted inwards, so that the layer of adhesive produces a fixed and sealing connection between the flange and the clamping region. In the embodiment shown in Fig. 3, only a comparatively small clamping zone with adhesive extensions on the two limbs is used. Here, an adhesive layer can be provided on the inner face of the bridge (page 8, lines 26 and 27 and page 9, lines 6 to 9) for the fixing and centering during the fitting.
Again, all these adhesive layers can first be positioned on the clamping zone only after t:~e vulcanisation of the sealing 3G profile. This has the consequential disadvantages described above.
o219ss~~
From DE 41 21 552 A1 it is known to conceal the visible surface of the retaining part with a strip of textile. For this, a first adhesive layer is coextruded onto the visible surface. The strip of textile is overlaid with a second adhesive layer of thermoplastic resin. For the concealment, the two adhesive layers are connected to one another by the application of pressure and heat.
From DE 33 46 070 A1 it is known to provide at least one limb of the U-shaped clamping region of the sealing profile with a pivotable extension of elastomeric material. The inner face of this which faces the flange is coated with a layer of adhesive. Upon the fitting, the extension is pivoted inwards, so that the layer of adhesive produces a fixed and sealing connection between the flange and the clamping region. In the embodiment shown in Fig. 3, only a comparatively small clamping zone with adhesive extensions on the two limbs is used. Here, an adhesive layer can be provided on the inner face of the bridge (page 8, lines 26 and 27 and page 9, lines 6 to 9) for the fixing and centering during the fitting.
Again, all these adhesive layers can first be positioned on the clamping zone only after t:~e vulcanisation of the sealing 3G profile. This has the consequential disadvantages described above.
o219ss~~
3 From DE 29 24 574 C2 it is known to provide a th_n layer of heat-responsive material on the inside of the U-shaped retaining part in an additional working step after t:~e vulcanisation and before the bending together of the limbs of the retaining part. The layer consists for example of pclyamide or ethylene-vinyl-acetate and extends from a retaining lip on the one limb, across the bridge, and as far as a retaining lip on the other limb. The retaining lips are intended to prevent an outward flow of the material layer during storage or during supply to the customer (column 2, lines 39 to 44). The fitter presses the retaining part onto a (bodywork) flange and then supplies heat from the outside to the retaining part, until the material foams at 70 to 120°
C and expands and the whole space between the retaining part and the flange is filled.
Various attempts have also been made to prevent the leakage of water between the retaining part and the flange into the interior of the motor vehicle, by applying a permanently plastic compound to the inside face of the bridge.
Again, this can only be effected after the vulcanisation of the sealing profile. The permanently plastic compound streams out from the dividing surfaces of the severed profile sections and contaminates the surroundings, including adjacent profile sections. Consequently, expensive cleaning actions are necessary. Also, as a result of the drying out and shrinkage of such permanently plastic compounds, one has a corresponding loss of sealing effect.
Basically, it is a universal fact that where there is a pressure gradient on motor vehicles at the fitted sealing profiles, then one m~~.st reckon on the danger than water will leak through the retaini~~g part of the sealing ~=ofile.
C and expands and the whole space between the retaining part and the flange is filled.
Various attempts have also been made to prevent the leakage of water between the retaining part and the flange into the interior of the motor vehicle, by applying a permanently plastic compound to the inside face of the bridge.
Again, this can only be effected after the vulcanisation of the sealing profile. The permanently plastic compound streams out from the dividing surfaces of the severed profile sections and contaminates the surroundings, including adjacent profile sections. Consequently, expensive cleaning actions are necessary. Also, as a result of the drying out and shrinkage of such permanently plastic compounds, one has a corresponding loss of sealing effect.
Basically, it is a universal fact that where there is a pressure gradient on motor vehicles at the fitted sealing profiles, then one m~~.st reckon on the danger than water will leak through the retaini~~g part of the sealing ~=ofile.
4 It is the object of the invention to make possible for all sealing profiles of the generic type first described above a permanent sealing against leakage water in the retaining part with comparatively little cost.
This object is achieved by a sealing profile comprising:
a retaining part having a substantially U-shaped cross-section and arranged to be fitted onto a flange extending around an opening of a motor vehicle which is to be sealed, and at least one sealing part which is fixed sealingly to the retaining part and which is arranged to provide a seal against a closure element of the motor vehicle which is movable relative to the opening, wherein the retaining part has limbs formed at the ends of a bridge, and wherein on an inner surface of the bridge extending between the limbs there is provided a continuous sealing strand of an adhesive sealing compound which can be brought into contact with the flange, characterised in that the sealing compound consists of an elastomeric mixture converted by vulcanisation into a permanently elastic, permanently sticky and foamed open-cell sealing strand which is connected by its own adhesiveness to the bridge.
The retaining part preferably consists of elastomeric material, in particular soft rubber. The retaining part can be made with or without embedded reinforcement, for example twisting wire or metallic strip. As required, one or more retaining lips can be formed on the inside of one or both limbs of the retaining part. The sealing compound according to the invention can be utilised in any given sealing part in a way which avoids, in most cases, any additional working step. Preferably, the sealing compound is introduced during the course of the coextrusion together with the manufacture of the sealing profile and is also vulcanised together with the sealing profile. The thus vulcanised sealing strand is connected permanently to the bridge, and therefore cannot fall from the retaining part or swell out from it during storage and transport. Therefore, until the further use of the
This object is achieved by a sealing profile comprising:
a retaining part having a substantially U-shaped cross-section and arranged to be fitted onto a flange extending around an opening of a motor vehicle which is to be sealed, and at least one sealing part which is fixed sealingly to the retaining part and which is arranged to provide a seal against a closure element of the motor vehicle which is movable relative to the opening, wherein the retaining part has limbs formed at the ends of a bridge, and wherein on an inner surface of the bridge extending between the limbs there is provided a continuous sealing strand of an adhesive sealing compound which can be brought into contact with the flange, characterised in that the sealing compound consists of an elastomeric mixture converted by vulcanisation into a permanently elastic, permanently sticky and foamed open-cell sealing strand which is connected by its own adhesiveness to the bridge.
The retaining part preferably consists of elastomeric material, in particular soft rubber. The retaining part can be made with or without embedded reinforcement, for example twisting wire or metallic strip. As required, one or more retaining lips can be formed on the inside of one or both limbs of the retaining part. The sealing compound according to the invention can be utilised in any given sealing part in a way which avoids, in most cases, any additional working step. Preferably, the sealing compound is introduced during the course of the coextrusion together with the manufacture of the sealing profile and is also vulcanised together with the sealing profile. The thus vulcanised sealing strand is connected permanently to the bridge, and therefore cannot fall from the retaining part or swell out from it during storage and transport. Therefore, until the further use of the
5 severed sections of the sealing profile, one always has clean dividing surfaces which can be subjected to further processing without the need for cleaning or other preparation measures.
In the coextrusion of the sealing compound with the retaining part and the at least one sealing part, the limbs of the retaining part are formed into their final state either before or in the injection head. One can therefore avoid a deformation of the retaining part after the vulcanisation stage. If on the other hand the sealing compound is also supplied at the same time to the bridge at the injection head, this can be effected for example by a nozzle in the retaining part which is not yet closed or which is not yet fully closed.
It is advantageous that the conversion of the sealing compound into the sealing strand is effected simultaneously with the vulcanisation of the sealing profile, i.e. without additional expense from the point of view of the technical process.
In the sealing profile described above sections can be cut from the finished sealing profile, and dividing surfaces of each section, including dividing surfaces of the sealing strand, are permanently and sealingly connectable to each other. This is effected preferably after the cooling of the sealing profile and possibly after the bending of the limbs into their final state. The connection of the dividing surfaces of the sections can be effected in the rubber factory, so that the motor vehicle manufacturer can be supplied with such sealing profile rings finished for the assembly line. Thus, one ensures that even in the region of 5a the sealing strand, no gaps remain for the penetration of leakage water.
The connection is effected by a vulcanisation adhesive.
A trouble-free connection can be achieved by the use of vulcanisation paste or a cold-setting adhesive.
The retaining part can be pushed onto the flange to an end position in which at least a part of the cross-section of the sealing strand is compressed by the flange and has its cells squashed, and in that in the end position the sealing strand is sealingly connected to the flange by its own adhesive power. Tthe sealing strand offers a very good and durable barrier against leakage water in the fitted state of the sealing profile.
Various remaining embodiments define various advantageous elastomeric mixtures for the sealing compound. As initiator for the foaming process one can use azodicarbonamide and/or sulphohydrazide, with zinc oxide as a cross-linking agent.
These and further features and advantages of the invention will be described in more detail hereinafter, with reference to a number of embodiments which are given by way of example and which are illustrated in the drawings. In the drawings:
Fig. 1 is a cross-section through a first embodiment of Q21988~~
a sealing pro~il~, Fig. 2 is a part of the cross-section shown in Fig. 1, in t~.e fitted state, Fig. 3 -is a cross-section through another embodiment of the sealing profile, Fig. 4 is a cross-section through a furtrer embodiment of the sealing profile, and Fig. 5 is a block diagram showing different production paths for the manufacture of the sealing profile.
Fig. 1 shows a sealing profile 1 comprising a retaining part 2 and sealing parts 3 and 4 formed on the retaining part 2 by coextrusion.
The retaining part 2 consists preferably of soft rubber and has a substantially U-shaped cross-section, with a bridge S and limbs 6 and 7 formed thereon. At least one retaining lip 9 and 10 extends from each limb 6, 7 into a channel 8 through the retaining part 2. Additionally, a reinforcement 11 is embedded within the retaining part 2. In the case of Fig. 1, the reinforcement 11 consists of twisting wire, although it could alternatively consist of a metallic sheet metal strip or other materials, which bestow on the retaining part 2 the strength and shape stability which are necessary in use.
The retaining part 2 is designed and equipped to be a p~,~sh fit on a flange 12 (Fig. 2) which extends around an opening of a motor vehicle which is to be sealed, and is designed and equipped to be held securely in place there.
The sealing parts 3, 4 are fixed sealingly to the rarair_ing part 2 and would reliably provide a seal in re'~ation to a c~es~are member of the motor vehicle which is movable relative to the opening. For this purpos= the sealing parts 3, 4 are made from expanded rubber which is excellent for the coextrusior. with the soft rubber of the retaining part 2 and can be connected permanently to the retaining part 2.
An inner surface 13 of the bridge 5 carries a sealing strand 14 which is adhesively stuck thereto. The sealing strand 14, as will be described in more detail hereinafter in connection with Fig. 5, is created from an elastomeric mixture by vulcanisation and is permanently elastic and of a foamed open-cell structure, and is permanently sticky both on the outer face and on the inner face. Thus, the sealing strand 14 adheres to the inner surface 13 on account of its inherent stickiness. Since the sealing strand 14 is also stable in terms of shape, it does not change its position relative to the retaining part 2, even when sections are cut off from the finished sealing profile 1 and, possibly after further processing, are finally fitted on the motor vehicle. One therefore always has clean neat dividing surfaces on the sealing profile, which permits an easy and accurately fitting ready-to-use manufacture of the sealing profile.
The dividing surfaces thus created by cutting off the sections can be permanently and sealingly connected to each other by different means which are known per se. This applies also to the dividing surfaces of the sealing strand 14. This connection of the dividing surfaces can be effected for example by the use of vulcanisation adhesive, vulcanisation paste or cold-setting adhesive, if closed rings are to be made from the sections of the sealing profile 1, before the section of the sealing profile 1 is fitted to the motor vehicle.
Fig. 2 shows the sealing profile 1 as it is r-tted or~ the 8 02'~ 98 8 4 flange 12. For this, the retaining part 2 has the open side of its cross-section pus~ed over the flange 12, until the end face of t:~e flange 12 has compressed the sealing strand 14 in the manner shcwn in Fig. 2. In this final fitting position, the initially open cells are closed by compression. The sticky cell walls adhere to one another. Moreover, both the side portions of the flange 12 which are in contact with the sealing strand 14, and also the limbs 6, 7, adhere to the outwardly sticky sealing strand 14.
During the pushing of the retaining part 2 onto the flange 12, the retaining lips 9 and 10 are defcrmed and are biassed against the opposing side faces of the flange 12. The retaining lips 9, 10 in this way set up static frictional forces which make it difficult for the sealing profile 1 to be pulled off the flange 12. Moreover, the retaining lips 10 which are thus biassed into contact with the flange 12 prevent the undesirable penetration of leakage water into the channel 8.
If leakage water should nevertheless come to be present in the channel 8 in spite of the retaining lips 10, the perfect sealing by the sealing strand 14 prevents such leakage water from leaking between the bridge 5 and the flange 12 and being able to enter the interior of the motor vehicle.
The sealing profile 1 shown in Figs. 1 and 2 is particularly suitable as a tailgate seal or rearward-facing door seal for motor vehicles.
In all the Figures of the drawings, the same parts are provided with the same respective reference numerals.
Fig. 3 shows a sealing proffile 1 which ffinds use as a seal for a sliding roof. Here, the retaining part 2 of soft ~.,bber with a hardness of for example 65 Shore A '_s coextruded with the sealing part 3 of soft rubber having a hardness of 45 Shore A.
The sealing profile 1 shown in Fig. 4 can be used for the sealing of a tailgate or a rearward-facing door of a motor vehicle.
The retaining part 2 is here manufactured without reinforcement from hard rubber having a hardness of 90 Shore A, Coextruded with the retaining part 2 are the retaining lips 9, 10 of soft rubber with a hardness of 65 Shore A and the sealing parts 3, 4 of expanded rubber having a hardness of 20 Shore A. With these material specifications one is obviously talking about examples which can be changed selectively according to the intended usage. ,In all cases one can ensure that, even without reinforcement within the retaining part 2, the retaining part 2 can be seated sufficiently fast on the associated bodywork flange, the latter not being shown in Fig. 4 for simplification.
In the block diagram according to Fig. 5, the reinforcement 11, an elastomeric material 16 for the retaining part 2, an elastorneric material 17 for the sealing part 3 and possibly 4, and an elastomeric mixture 18 for the sealing strand 14 are shown as being supplied to an injection head 15 for the manufacture of a sealing profile 1 according to the preceding Figures. All these materials are coextruded from the injection head 15 into the sealing profile 1 which subsequently passes through a vulcanisation zone 19 and a cooling device 20, before being cut into sections 22 in a cutting station 21.
This marufacturir._g process is particularly suitable for ~30 sealing profiles 1 where tze retaining part 2 is already given its final shape configuration, ready for fit~v~ng, in the injection head 15, as is the case for example for Fig. 4.
If on the other hand the retaining part 2 is not yet closed or is not yet fully closed in the injection head 15, the elastomeric mixture 18 can be introduced into the 5 retaining part 2 at a point subsequent to the injection head 15, as is indicated in Fig. 5 by broken lines.
A further alternative is also shown in Fig. 5 by chain-dotted lines. Here, the sealing profile, subsequent to the cooling device 20, is further processed, initially in a 10 bending station 23, before it is cut into the sections 22 in the cutting station 21. In the bending station 23, the limbs 6 and 7 of the retaining part 2 in which a metallic reinforcement is embedded are bent to their final shape for fitting.
Examples of the composition of the elastomeric mixture are set out below:
(1) Natural rubber (NR) 40;
Isobutene-isoprene rubber (IIR) 30;
Chloro-isobutene-isoprene rubber (CIIR) 20:
Ethylene-propylene-dime-terpolymer (EPDM) 10;
Calcium carbonate 30~
Siliceous chalk ~ 70~
Zinc oxide 5:
Cross-linking means including sulphur 5;
Mineral oil 70;
Azodicarbonamide 4;
Sulphohydrazide 6:
(2) Natural rubber (NR) 50;
Isobutene-isoprene rubber (IIR) 40~
_ Ethylene-propylene-dime-terpolymer (EPDM) 10:
Calcium carbonate 25;
Siliceous chalk 60~
Carbon black 10:
Zinc oxide 5;
Cross-linking means, including sulphur 5;
Mineral oil 75;
Azodicarbonamide 5;
Sulphohydrazide 4;
(3) Natural rubber (NR) 45;
Isobutene-isoprene rubber (IIR) 45;
Ethylene-propylene-dime-terpolymer (EPDM) 10;
1Q Calcium carbonate 30;
Siliceous chalk 70;
Zinc oxide 5;
Cross-linking means, including sulphur 4;
Mineral oil 70;
Azodicarbonamide 5;
Sulphohydrazide 2.5;
(4) Natural rubber (NR) 40;
Isobutene-isoprene rubber (IIR) 30;
Bromo-isobutene-isoprene rubber (BIIR) 20;
Ethylene-propylene-dime-terpolymer (EPDM) 10;
Calcium carbonate 45;
Siliceous chalk 60;
Zinc oxide 5;
Cross-linking means, including sulphur 5;
Mineral oil 90;
Azodicarbonamide 4;
Sulphohydrazide 4.
The constituent natural rubber (NR) is re spectively substituted by a blend of natural rubber (NR) and styrene-butadiene rubber (SBR).
The constituent natural rubber (NR) is respectively substituted by a blend of natural rubber (NR) and polybutadiene (BR).
The sealing compound for the sealing strand comprises as base material a blend of natural rubber (NR) and synthetic rubber.
The elastomeric mixtures defined in detail in the examples are sealing compounds for sealing strands which can be converted by vulcanisation into a permanently elastic, permanently sticky and foamed open-cell state. It is common to all the sealing compounds which are described in detail that they comprise as a base material a blend of natural rubber (NR) and synthetic rubber. In this way it is possible so to vulcanise the sealing compounds that only the natural rubber is cross-linked, with the synthetic rubber on the other hand remaining predominantly not cross-linked. Since the sealing compound is a mixture, it has the properties of a cross-linked vulcanised rubber in respect of its shape properties, and the properties of an unvulcanised rubber in respect of its stickiness. Optimum properties can be obtained by the designated addition of cross-linking auxiliary means such as are itemised in the examples.
In the coextrusion of the sealing compound with the retaining part and the at least one sealing part, the limbs of the retaining part are formed into their final state either before or in the injection head. One can therefore avoid a deformation of the retaining part after the vulcanisation stage. If on the other hand the sealing compound is also supplied at the same time to the bridge at the injection head, this can be effected for example by a nozzle in the retaining part which is not yet closed or which is not yet fully closed.
It is advantageous that the conversion of the sealing compound into the sealing strand is effected simultaneously with the vulcanisation of the sealing profile, i.e. without additional expense from the point of view of the technical process.
In the sealing profile described above sections can be cut from the finished sealing profile, and dividing surfaces of each section, including dividing surfaces of the sealing strand, are permanently and sealingly connectable to each other. This is effected preferably after the cooling of the sealing profile and possibly after the bending of the limbs into their final state. The connection of the dividing surfaces of the sections can be effected in the rubber factory, so that the motor vehicle manufacturer can be supplied with such sealing profile rings finished for the assembly line. Thus, one ensures that even in the region of 5a the sealing strand, no gaps remain for the penetration of leakage water.
The connection is effected by a vulcanisation adhesive.
A trouble-free connection can be achieved by the use of vulcanisation paste or a cold-setting adhesive.
The retaining part can be pushed onto the flange to an end position in which at least a part of the cross-section of the sealing strand is compressed by the flange and has its cells squashed, and in that in the end position the sealing strand is sealingly connected to the flange by its own adhesive power. Tthe sealing strand offers a very good and durable barrier against leakage water in the fitted state of the sealing profile.
Various remaining embodiments define various advantageous elastomeric mixtures for the sealing compound. As initiator for the foaming process one can use azodicarbonamide and/or sulphohydrazide, with zinc oxide as a cross-linking agent.
These and further features and advantages of the invention will be described in more detail hereinafter, with reference to a number of embodiments which are given by way of example and which are illustrated in the drawings. In the drawings:
Fig. 1 is a cross-section through a first embodiment of Q21988~~
a sealing pro~il~, Fig. 2 is a part of the cross-section shown in Fig. 1, in t~.e fitted state, Fig. 3 -is a cross-section through another embodiment of the sealing profile, Fig. 4 is a cross-section through a furtrer embodiment of the sealing profile, and Fig. 5 is a block diagram showing different production paths for the manufacture of the sealing profile.
Fig. 1 shows a sealing profile 1 comprising a retaining part 2 and sealing parts 3 and 4 formed on the retaining part 2 by coextrusion.
The retaining part 2 consists preferably of soft rubber and has a substantially U-shaped cross-section, with a bridge S and limbs 6 and 7 formed thereon. At least one retaining lip 9 and 10 extends from each limb 6, 7 into a channel 8 through the retaining part 2. Additionally, a reinforcement 11 is embedded within the retaining part 2. In the case of Fig. 1, the reinforcement 11 consists of twisting wire, although it could alternatively consist of a metallic sheet metal strip or other materials, which bestow on the retaining part 2 the strength and shape stability which are necessary in use.
The retaining part 2 is designed and equipped to be a p~,~sh fit on a flange 12 (Fig. 2) which extends around an opening of a motor vehicle which is to be sealed, and is designed and equipped to be held securely in place there.
The sealing parts 3, 4 are fixed sealingly to the rarair_ing part 2 and would reliably provide a seal in re'~ation to a c~es~are member of the motor vehicle which is movable relative to the opening. For this purpos= the sealing parts 3, 4 are made from expanded rubber which is excellent for the coextrusior. with the soft rubber of the retaining part 2 and can be connected permanently to the retaining part 2.
An inner surface 13 of the bridge 5 carries a sealing strand 14 which is adhesively stuck thereto. The sealing strand 14, as will be described in more detail hereinafter in connection with Fig. 5, is created from an elastomeric mixture by vulcanisation and is permanently elastic and of a foamed open-cell structure, and is permanently sticky both on the outer face and on the inner face. Thus, the sealing strand 14 adheres to the inner surface 13 on account of its inherent stickiness. Since the sealing strand 14 is also stable in terms of shape, it does not change its position relative to the retaining part 2, even when sections are cut off from the finished sealing profile 1 and, possibly after further processing, are finally fitted on the motor vehicle. One therefore always has clean neat dividing surfaces on the sealing profile, which permits an easy and accurately fitting ready-to-use manufacture of the sealing profile.
The dividing surfaces thus created by cutting off the sections can be permanently and sealingly connected to each other by different means which are known per se. This applies also to the dividing surfaces of the sealing strand 14. This connection of the dividing surfaces can be effected for example by the use of vulcanisation adhesive, vulcanisation paste or cold-setting adhesive, if closed rings are to be made from the sections of the sealing profile 1, before the section of the sealing profile 1 is fitted to the motor vehicle.
Fig. 2 shows the sealing profile 1 as it is r-tted or~ the 8 02'~ 98 8 4 flange 12. For this, the retaining part 2 has the open side of its cross-section pus~ed over the flange 12, until the end face of t:~e flange 12 has compressed the sealing strand 14 in the manner shcwn in Fig. 2. In this final fitting position, the initially open cells are closed by compression. The sticky cell walls adhere to one another. Moreover, both the side portions of the flange 12 which are in contact with the sealing strand 14, and also the limbs 6, 7, adhere to the outwardly sticky sealing strand 14.
During the pushing of the retaining part 2 onto the flange 12, the retaining lips 9 and 10 are defcrmed and are biassed against the opposing side faces of the flange 12. The retaining lips 9, 10 in this way set up static frictional forces which make it difficult for the sealing profile 1 to be pulled off the flange 12. Moreover, the retaining lips 10 which are thus biassed into contact with the flange 12 prevent the undesirable penetration of leakage water into the channel 8.
If leakage water should nevertheless come to be present in the channel 8 in spite of the retaining lips 10, the perfect sealing by the sealing strand 14 prevents such leakage water from leaking between the bridge 5 and the flange 12 and being able to enter the interior of the motor vehicle.
The sealing profile 1 shown in Figs. 1 and 2 is particularly suitable as a tailgate seal or rearward-facing door seal for motor vehicles.
In all the Figures of the drawings, the same parts are provided with the same respective reference numerals.
Fig. 3 shows a sealing proffile 1 which ffinds use as a seal for a sliding roof. Here, the retaining part 2 of soft ~.,bber with a hardness of for example 65 Shore A '_s coextruded with the sealing part 3 of soft rubber having a hardness of 45 Shore A.
The sealing profile 1 shown in Fig. 4 can be used for the sealing of a tailgate or a rearward-facing door of a motor vehicle.
The retaining part 2 is here manufactured without reinforcement from hard rubber having a hardness of 90 Shore A, Coextruded with the retaining part 2 are the retaining lips 9, 10 of soft rubber with a hardness of 65 Shore A and the sealing parts 3, 4 of expanded rubber having a hardness of 20 Shore A. With these material specifications one is obviously talking about examples which can be changed selectively according to the intended usage. ,In all cases one can ensure that, even without reinforcement within the retaining part 2, the retaining part 2 can be seated sufficiently fast on the associated bodywork flange, the latter not being shown in Fig. 4 for simplification.
In the block diagram according to Fig. 5, the reinforcement 11, an elastomeric material 16 for the retaining part 2, an elastorneric material 17 for the sealing part 3 and possibly 4, and an elastomeric mixture 18 for the sealing strand 14 are shown as being supplied to an injection head 15 for the manufacture of a sealing profile 1 according to the preceding Figures. All these materials are coextruded from the injection head 15 into the sealing profile 1 which subsequently passes through a vulcanisation zone 19 and a cooling device 20, before being cut into sections 22 in a cutting station 21.
This marufacturir._g process is particularly suitable for ~30 sealing profiles 1 where tze retaining part 2 is already given its final shape configuration, ready for fit~v~ng, in the injection head 15, as is the case for example for Fig. 4.
If on the other hand the retaining part 2 is not yet closed or is not yet fully closed in the injection head 15, the elastomeric mixture 18 can be introduced into the 5 retaining part 2 at a point subsequent to the injection head 15, as is indicated in Fig. 5 by broken lines.
A further alternative is also shown in Fig. 5 by chain-dotted lines. Here, the sealing profile, subsequent to the cooling device 20, is further processed, initially in a 10 bending station 23, before it is cut into the sections 22 in the cutting station 21. In the bending station 23, the limbs 6 and 7 of the retaining part 2 in which a metallic reinforcement is embedded are bent to their final shape for fitting.
Examples of the composition of the elastomeric mixture are set out below:
(1) Natural rubber (NR) 40;
Isobutene-isoprene rubber (IIR) 30;
Chloro-isobutene-isoprene rubber (CIIR) 20:
Ethylene-propylene-dime-terpolymer (EPDM) 10;
Calcium carbonate 30~
Siliceous chalk ~ 70~
Zinc oxide 5:
Cross-linking means including sulphur 5;
Mineral oil 70;
Azodicarbonamide 4;
Sulphohydrazide 6:
(2) Natural rubber (NR) 50;
Isobutene-isoprene rubber (IIR) 40~
_ Ethylene-propylene-dime-terpolymer (EPDM) 10:
Calcium carbonate 25;
Siliceous chalk 60~
Carbon black 10:
Zinc oxide 5;
Cross-linking means, including sulphur 5;
Mineral oil 75;
Azodicarbonamide 5;
Sulphohydrazide 4;
(3) Natural rubber (NR) 45;
Isobutene-isoprene rubber (IIR) 45;
Ethylene-propylene-dime-terpolymer (EPDM) 10;
1Q Calcium carbonate 30;
Siliceous chalk 70;
Zinc oxide 5;
Cross-linking means, including sulphur 4;
Mineral oil 70;
Azodicarbonamide 5;
Sulphohydrazide 2.5;
(4) Natural rubber (NR) 40;
Isobutene-isoprene rubber (IIR) 30;
Bromo-isobutene-isoprene rubber (BIIR) 20;
Ethylene-propylene-dime-terpolymer (EPDM) 10;
Calcium carbonate 45;
Siliceous chalk 60;
Zinc oxide 5;
Cross-linking means, including sulphur 5;
Mineral oil 90;
Azodicarbonamide 4;
Sulphohydrazide 4.
The constituent natural rubber (NR) is re spectively substituted by a blend of natural rubber (NR) and styrene-butadiene rubber (SBR).
The constituent natural rubber (NR) is respectively substituted by a blend of natural rubber (NR) and polybutadiene (BR).
The sealing compound for the sealing strand comprises as base material a blend of natural rubber (NR) and synthetic rubber.
The elastomeric mixtures defined in detail in the examples are sealing compounds for sealing strands which can be converted by vulcanisation into a permanently elastic, permanently sticky and foamed open-cell state. It is common to all the sealing compounds which are described in detail that they comprise as a base material a blend of natural rubber (NR) and synthetic rubber. In this way it is possible so to vulcanise the sealing compounds that only the natural rubber is cross-linked, with the synthetic rubber on the other hand remaining predominantly not cross-linked. Since the sealing compound is a mixture, it has the properties of a cross-linked vulcanised rubber in respect of its shape properties, and the properties of an unvulcanised rubber in respect of its stickiness. Optimum properties can be obtained by the designated addition of cross-linking auxiliary means such as are itemised in the examples.
Claims (16)
1. Sealing profile comprising:
a retaining part having a substantially U-shaped cross-section and arranged to be fitted onto a flange extending around an opening of a motor vehicle which is to be sealed, and at least one sealing part which is fixed sealingly to the retaining part and which is arranged to provide a seal against a closure element of the motor vehicle which is movable relative to the opening, wherein the retaining part has limbs formed at the ends of a bridge, and wherein on an inner surface of the bridge extending between the limbs there is provided a continuous sealing strand of an adhesive sealing compound which can be brought into contact with the flange, characterised in that the sealing compound consists of an elastomeric mixture converted by vulcanisation into a permanently elastic, permanently sticky and foamed open-cell sealing strand which is connected by its own adhesiveness to the bridge.
a retaining part having a substantially U-shaped cross-section and arranged to be fitted onto a flange extending around an opening of a motor vehicle which is to be sealed, and at least one sealing part which is fixed sealingly to the retaining part and which is arranged to provide a seal against a closure element of the motor vehicle which is movable relative to the opening, wherein the retaining part has limbs formed at the ends of a bridge, and wherein on an inner surface of the bridge extending between the limbs there is provided a continuous sealing strand of an adhesive sealing compound which can be brought into contact with the flange, characterised in that the sealing compound consists of an elastomeric mixture converted by vulcanisation into a permanently elastic, permanently sticky and foamed open-cell sealing strand which is connected by its own adhesiveness to the bridge.
2. Sealing profile according to claim 1, characterised in that sections can be cut from the finished sealing profile, and dividing surfaces of each section, including dividing surfaces of the sealing strand, are permanently and sealingly connectable to each other.
3. Sealing profile according to claim 2, characterised in that the connection is effected by a vulcanisation adhesive.
4. Sealing profile according to any one of claims 1 to 3, characterised in that the retaining part can be pushed onto the flange to an end position in which at least a part of the cross-section of the sealing strand is compressed by the flange and has its cells squashed, and in that in the end position the sealing strand is sealingly connected to the flange by its own adhesive power.
5. Sealing profile according to any one of claims 1 to 4, characterised in that the sealing compound comprises the following constituents in parts per hundred rubber:
Natural rubber (NR) 40 Isobutene-isoprene rubber (IIR) 30 Chloro-isobutene-isoprene rubber (CIIR) 20 Ethylene-propylene-diene-terpolymer (EPDM) 10 Calcium carbonate 30 Siliceous chalk 70 Zinc oxide 5 Cross-linking means including sulphur 5 Mineral oil 70 Azodicarbonamide 4 Sulphohydrazide 6.
Natural rubber (NR) 40 Isobutene-isoprene rubber (IIR) 30 Chloro-isobutene-isoprene rubber (CIIR) 20 Ethylene-propylene-diene-terpolymer (EPDM) 10 Calcium carbonate 30 Siliceous chalk 70 Zinc oxide 5 Cross-linking means including sulphur 5 Mineral oil 70 Azodicarbonamide 4 Sulphohydrazide 6.
6. Sealing profile according to any one of claims 1 to 4, characterised in that the sealing compound comprises the following constituents in parts per hundred rubber:
Natural rubber (NR) 50 Isobutene-isoprene rubber (IIR) 40 Ethylene-propylene-diene-terpolymer (EPDM) 10 Calcium carbonate 25 Siliceous chalk 60 Carbon black 10 Zinc oxide 5 Cross-linking means, including sulphur ~~5 Mineral oil ~~~~~75 Azodicarbonamide ~~~~5 Sulphohydrazide ~~~~4.
Natural rubber (NR) 50 Isobutene-isoprene rubber (IIR) 40 Ethylene-propylene-diene-terpolymer (EPDM) 10 Calcium carbonate 25 Siliceous chalk 60 Carbon black 10 Zinc oxide 5 Cross-linking means, including sulphur ~~5 Mineral oil ~~~~~75 Azodicarbonamide ~~~~5 Sulphohydrazide ~~~~4.
7. Sealing profile according to any one of claims 1 to 4, characterised in that the sealing compound comprises the following constituents in parts per hundred rubber:
Natural rubber (NR) ~45 Isobutene-isoprene rubber (IIR) ~45 Ethylene-propylene-diene-terpolymer (EPDM) 10 Calcium carbonate ~30 Siliceous chalk ~70 Zinc oxide ~5 Cross-linking means, including sulphur ~4 Mineral oil ~70 Azodicarbonamide ~5 Sulphohydrazide ~2.5.
Natural rubber (NR) ~45 Isobutene-isoprene rubber (IIR) ~45 Ethylene-propylene-diene-terpolymer (EPDM) 10 Calcium carbonate ~30 Siliceous chalk ~70 Zinc oxide ~5 Cross-linking means, including sulphur ~4 Mineral oil ~70 Azodicarbonamide ~5 Sulphohydrazide ~2.5.
8. Sealing profile according to any one of claims 1 to 4, characterised in that the sealing compound comprises the following constituents in parts per hundred rubber:
Natural rubber (NR) 40 Isobutene-isoprene rubber (IIR) 30 Bromo-isobutene-isoprene rubber (BIIR) 20 Ethylene-propylene-diene-terpolymer (EPDM) 10 Calcium carbonate 45 Siliceous chalk 60 Zinc oxide 5 Cross-linking means, including sulphur 5 Mineral oil 90 Azodicarbonamide ~~~~4 Sulphohydrazide ~~~~4.
Natural rubber (NR) 40 Isobutene-isoprene rubber (IIR) 30 Bromo-isobutene-isoprene rubber (BIIR) 20 Ethylene-propylene-diene-terpolymer (EPDM) 10 Calcium carbonate 45 Siliceous chalk 60 Zinc oxide 5 Cross-linking means, including sulphur 5 Mineral oil 90 Azodicarbonamide ~~~~4 Sulphohydrazide ~~~~4.
9. Sealing profile according to any one of claims 5 to 8, characterised in that the constituent natural rubber (NR) is respectively substituted by a blend of natural rubber (NR) and styrene-butadiene rubber (SBR).
10. Sealing profile according to any one of claims 5 to 8, characterised in that the constituent natural rubber (NR) is respectively substituted by a blend of natural rubber (NR) and polybutadiene (BR).
11. Sealing profile according to any one of claims 5 to 8, characterised in that the constituent natural rubber (NR) is respectively substituted by a blend of natural rubber (NR), styrene-butadiene rubber (SBR) and polybutadiene (BR).
12. Sealing profile according to any one of claims 1 to 11, characterised in that the sealing compound for the sealing strand comprises as base material a blend of natural rubber (NR) and synthetic rubber.
13. Sealing profile according to any one of claims 1 to 12, characterised in that the sealing compound for the sealing strand comprises zinc oxide as cross-linking means.
14. Sealing profile according to any one of claims 1 to 13, characterised in that the sealing compound for the sealing strand contains only such an amount of cross-linking means that in the sealing compound only the natural rubber is vulcanised and the synthetic rubber in the sealing compound remains at least partially unvulcanised.
15. Sealing profile according to claim 14, wherein the synthetic rubber in the sealing compound remains fully unvulcanised.
16. Sealing profile according to any one of claims 1 to 15, characterised in that the sealing compound for the sealing strand comprises azodicarbonamide and/or sulphohydrazide as an initiator for the foaming.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19531167A DE19531167C2 (en) | 1995-08-24 | 1995-08-24 | Motor vehicle sealing profile |
| DEP19531167.1 | 1995-08-24 | ||
| PCT/EP1996/003323 WO1997008003A1 (en) | 1995-08-24 | 1996-07-27 | Profiled motor vehicle seal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2198847A1 CA2198847A1 (en) | 1997-02-25 |
| CA2198847C true CA2198847C (en) | 2007-04-10 |
Family
ID=38007179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002198847A Expired - Fee Related CA2198847C (en) | 1995-08-24 | 1996-07-27 | Sealing profile for motor vehicles |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2198847C (en) |
-
1996
- 1996-07-27 CA CA002198847A patent/CA2198847C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2198847A1 (en) | 1997-02-25 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |