WO2010020447A1

WO2010020447A1 - Heating sleeve as a component of a vulcanization device, particularly for the production of a continuously closed drive belt

Info

Publication number: WO2010020447A1
Application number: PCT/EP2009/057411
Authority: WO
Inventors: Karsten Sander; Reinhardt Teves; Claus-Lueder Mahnken; Ymte Greydanus; Christoph Bederna
Original assignee: Contitech Antriebssysteme Gmbh
Priority date: 2008-08-19
Filing date: 2009-06-16
Publication date: 2010-02-25
Also published as: DE102008038322A1

Abstract

The invention relates to a heating sleeve (1) as a component of a vulcanization device for the production of a tubular article, particularly in the form of a continuously closed drive belt, having a base body made from a material that can be vulcanized, wherein the heating sleeve (1) has at least one interior layer (2) and one exterior layer (3), wherein the interior layer (2) is made from a harder material than the exterior layer (3). The interior layer (2) of the heating sleeve (1) comprises a greater shore A hardness in the vulcanization phase than the article to be vulcanized, which is particularly the case of a drive belt. The interior layer (2) preferably consists of a sulfur cross-linked EPDM mixture having a shore A hardness of 82 to 89 at a layer thickness of 5 to 7 mm. The exterior layer (3) particularly consists of a resin cross-linked butyl rubber mixture having a shore A hardness of 64 to 75 at a layer thickness of 1.5 to 4 mm.

Description

description

Heating sleeve as a component of a vulcanization device, in particular for producing an endlessly closed drive belt

The invention relates to a heating jacket as a component of a vulcanization apparatus for producing a tubular article with a base body made of a vulcanizable material, wherein the heating jacket consists of a polymer material which is stable under vulcanization conditions.

As a tubular article is here a hose, air bag, compensator, endless belt, endless belt or endless belt referred to, the endless belt in the form of a drive belt is of particular importance. In this respect, reference is made in particular to the following patent literature: DE 10 2006 007 509 A1, WO 2005/080821 A1, WO 2006/066669 A1, US Pat. No. 3,981,206 and US Pat. No. 5,417,618.

The elasticity of the tubular article taking into account the bending elasticity, which is particularly important in drive belts, is achieved in that the base body consists of a polymeric material with elastic properties, in which case the two material groups elastomers and thermoplastic elastomers (TPE) are mentioned. In most cases, elastomers based on vulcanizable rubber mixtures comprising at least one rubber component (eg EPM, EPDM, HNBR, FKM) and mixture ingredients are used. The mixture ingredients thereby comprise at least one crosslinker or a crosslinker system (crosslinking agent and accelerator). Other mixing ingredients are usually still a filler and / or a processing aid and / or a plasticizer and / or an anti-aging agent and optionally further Additives (eg fibers, color pigments). In this regard, reference is made to the general state of rubber mixing technology.

The elastic main body of the tubular article is usually still provided with an embedded reinforcement or tensile carrier, which can be designed in one or more layers.

The heating sleeve as a tubular or sleeve-shaped structure is a component of the vulcanization device. Their task is to seal the boiler system against the entry of steam into the vulcanizate area. In addition, it should be used to smooth the

Article back, especially belt back, contribute. The heating jacket consists of a under vulcanization (130 to 200 ° C) resistant polymeric material. So far, the heating sleeves were made in one layer from several layers of a butyl rubber calender plate. However, this involves the following disadvantages in particular:

Geometric instability, for example due to shrinkage in height and by increase in circumference;

- lack of stability;

- Too low hardness in conjunction with back ripple effects, especially in drive belts, especially in turn with timing belt.

In the background of this overall problem, the object of the invention is to provide a heating sleeve, with a secure sealing of the boiler system is ensured against steam into the Vulkanisatbereich. In addition, the heating jacket to contribute to a reliable smoothing of the back structure of an article, in particular a drive belt. This object is achieved in that the heating sleeve has at least one inner layer and an outer layer, wherein the inner layer consists of a harder material than the outer layer.

The heating sleeve is used in particular in the manufacture of a hose, in particular a short hose, a bellows (Axialbalg, Kreuzlagenbalg), a compensator, an endless belt, endless belt or endless belt for use. Of particular importance is the use of the new heating jacket in the manufacture of an endlessly closed flexible elastic drive belt, which may be constructively designed as a flat belt, V-belt, V-ribbed belt or toothed belt.

The inner layer of the heating sleeve is in contact with the article back or with respect to the center of gravity to the back of the belt. In the vulcanization of the article blank or belt blank is made by the hard-soft combination of

Heating jacket achieved an effective smoothing of the back structure of the article or belt, with simultaneous sealing against steam entering the Vulkanisatbereich.

With regard to the inner layer and the outer layer of the heating jacket, the following material parameters preferably apply:

inner layer

The inner layer has a hardness of> 80 Shore A, in particular from 81 to 95 Shore A, in particular again from 82 to 89 Shore A, on.

A vulcanized rubber mixture is used, wherein the rubber component may be an ethylene-propylene copolymer (EPM) or an ethylene-propylene-diene copolymer (EPDM). The preferred

Rubber component is EPDM. The rubber compound is particular sulfur-crosslinked or peroxide crosslinked. In addition to the crosslinker, other mixture ingredients may also be mixed into the rubber mixture, namely a filler and / or a processing agent and / or a plasticizer and / or an aging inhibitor and optionally further additives (eg fibers). In this regard, reference is also made here to the general rubber mixing technology.

In addition to the aforementioned rubber components, other types of rubber trimmed to a hardness of> 80 Shore A can also be used. Particularly noteworthy here are (partially) hydrogenated nitrile rubber (HNBR), butyl rubber (HR), fluorinated rubber (FKM) or silicone rubber (MVQ).

The layer thickness of the inner layer is 3 to 10 mm, in particular 5 to 7 mm.

outer layer

The outer layer has a hardness of <80 Shore A, in particular from 60 to 79 Shore A, in particular again from 64 to 75 Shore A, on.

Also used is a vulcanized rubber mixture, in which case in particular a gas-tight rubber component, which may be butyl rubber (HR), bromobutyl rubber (BIIR) or chlorobutyl rubber (CUR), is used. The preferred rubber component is HR. The rubber mixture is in particular resin crosslinked, for example by means of a phenolic resin. With regard to the other mixture ingredients, the same applies as with the inner layer.

The layer thickness of the outer layer is 1 to 7 mm, in particular 1.5 to 4 mm.

Further design options of the heating jacket are mentioned in connection with the description of the figures. The invention will now be explained by means of exemplary embodiments with reference to schematic drawings. Show it:

Figure 1 shows the circumferential section of a heating jacket without intermediate layer.

2 shows the longitudinal section of a heating jacket without intermediate layer.

3 shows the longitudinal section of a toothed belt.

4 shows the circumferential section of a heating jacket with intermediate layer;

5 shows the longitudinal section of a heating jacket with intermediate layer.

6 shows the longitudinal section of a heating jacket with paragraph without intermediate layer.

Fig. 7 shows the longitudinal section of a heating jacket with paragraph and intermediate layer.

The heating jacket 1 according to FIGS. 1 and 2 consists of an inner layer 2 and an outer layer 3. The inner layer is a sulfur-crosslinked EPDM mixture with a hardness of 82 to 89 Shore A and has a layer thickness of 5 to 7 mm. The

Outer layer is a resin-crosslinked IIR-based compound with a hardness of 64 to 75 Shore A and has a layer thickness of 1, 5 to 4 mm.

Fig. 3 shows the section of a tubular article 4 in the form of an endless drive belt, which in turn is formed here as a toothed belt. Of the

Toothed belt has a cover layer 5 with cover layer surface 6 and a substructure 8 with a tooth-shaped substructure surface 9 as a power transmission zone. The cover layer 5, which is also referred to as the belt back, and the substructure 8 form as a whole unit the elastic base body, which consists of a vulcanizable rubber mixture. The rubber component is usually an ethylene-propylene copolymer (EPM), an ethylene-propylene-diene copolymer (EPDM), a (partially) hydrogenated nitrile rubber (HNBR), fluororubber (FKM) or chloroprene rubber (CR) used. In the main body also several parallel tensile strands 7 are embedded, which may consist of steel, polyamide, aramid, polyester, glass fibers, carbon fibers, polyetheretherketone (PEEK) or polyethylene-2,6-naphthalate (PEN).

The substructure surface 9 is provided with an abrasion-resistant coating 10, for example in the form of a textile covering (woven, knitted or knitted fabric), which may additionally be sealed with a plastics material, for example by means of a fluorine-containing plastic (for example PTFE) for oil resistance.

The cover layer surface 6 is usually also provided with a coating 11, for example, again in the form of a textile cover (fabric, knitted fabric, knitted fabric) or paper, non-woven or plastic film. It may also be prepared in the above sense oil resistant.

The application of the coatings 10 and 11 preferably takes place on the still unvulcanized belt blank, which is vulcanized after the application of these coatings, connected to a durable bond with the cover layer 5 and der Unterbau 8.

In the vulcanization of the belt blank, the inner layer 2 of the heating cuff 1 has contact with the belt back, either with the coating 11 or with a coating free execution with the cover layer surface 6. In both cases, with the new heating cuff smoothing the back structure of the belt achieved.

The inner layer 2 of the heating jacket 1 has a larger in the vulcanization

Hardness in Shore A as the tubular article to be vulcanized. This is of particular importance in the form of articles, in which case the drive belt primarily to call is. The hard heating cuff is always able to press the softer article into the mold.

In the following, further advantageous design variants of the heating jacket 1 are presented.

The heating sleeve 1 according to FIGS. 4 and 5 is additionally provided with an intermediate layer 12 which connects the inner layer 2 to the outer layer 3. This intermediate layer, which may also be referred to as a bonding layer, consists of a nonwoven, knitted fabric, knitted fabric or fabric, with or without adhesion promoter. Such intermediate layers are suitable for holding together the different polymeric materials of the inner layer and the outer layer. In addition, they contribute to the reinforcement of the heating jacket. An intermediate layer which has been prepared with a bonding agent can be, for example, an adhesive fleece. For example, the following trade and company names can be used as adhesion agents:

Chemosil (Henkel, Lord)

Chemlock (Chemetall) Megum (Chemetall)

Thixon (Morton)

Cilbond (CiI)

Parlock (Lord)

According to Fig. 6, the heating jacket 1, which has no intermediate layer, at its two end faces (sealing surfaces), each provided with a shoulder 13. The heel is part of the outer layer 3 and consists of the same material as the outer layer. The inner layer 2 is embedded. Fig. 7 shows a heating jacket 1, which is also provided at its two end faces (sealing surfaces), each with a paragraph 13, but here in addition an intermediate layer 12 is present.

The paragraph dimension of the paragraph 13 is 5 to 50 mm, in particular 5 to 15 mm. The paragraph dimension is the supernatant with respect to the outer layer 3.

With regard to the geometric shape of the heating jacket, there are many design variants. The variations refer to circumferential length, height, with or without a reinforced heel, with or without reinforcing profile strips in the upper and / or lower fifth. All of these design variants mentioned here can be used with or without an intermediate layer.

LIST OF REFERENCE NUMBERS

(Part of the description)

I Heating jacket (vulcanisation cuff) 2 inner layer

3 outer layer

4 tubular article in the form of an endlessly closed drive belt

5 top layer (strap back)

6 top layer surface 7 tension member (tensile strand)

8 substructure

9 substructure surface (power transmission zone)

10 coating

I I coating 12 intermediate layer (bonding layer)

13 Paragraph on the end faces (sealing surfaces) of the heating jacket

Claims

claims

1. Heating jacket (1) as a component of a vulcanization apparatus for producing a tubular article (4) with a base body made of a vulcanizable material, wherein the heating jacket (1) consists of a polymer material which is resistant under vulcanization conditions, characterized in that the heating jacket (1) at least one inner layer (2) and one outer layer (3), wherein the inner layer (2) consists of a harder material than the outer layer (3).

2. Heating sleeve according to claim 1, characterized in that the heating sleeve (1) for the vulcanization of a hose, air spring bellows, compensator, an endless belt, endless belt or endless belt is used.

3. Heating jacket (1) as a component of a vulcanization device for producing a tubular article (4) in the form of an endless drive belt with a body of a vulcanizable material, wherein the heating jacket (1) consists of a polymer material which is stable under vulcanization conditions, characterized the heating sleeve (1) has at least one inner layer (2) and one outer layer (3), wherein the

Inner layer (2) made of a harder material than the outer layer (3).

4. Heating sleeve according to claim 3, characterized in that the heating jacket (1) for producing a flat belt, V-belt, V-ribbed belt or toothed belt is used.

5. Heating jacket according to one of claims 1 to 4, characterized in that the inner layer (2) of the heating jacket (1) has a hardness of> 80 Shore A.

6. Heating jacket according to claim 5, characterized in that the inner layer

(2) the heating jacket (1) has a hardness of 81 to 95 Shore A.

7. Heating jacket according to claim 5 or 6, characterized in that the inner layer (2) of the heating jacket (1) has a hardness of 82 to 89 Shore A.

8. Heating jacket according to one of claims 1 to 7, characterized in that the outer layer (3) of the heating jacket (1) has a hardness of <80 Shore A.

9. Heating jacket according to claim 8, characterized in that the outer layer

(3) the heating jacket (1) has a hardness of 60 to 79 Shore A.

10. Heating jacket according to claim 8 or 9, characterized in that the

Outer layer (3) of the heating jacket (1) has a hardness of 64 to 75 Shore A.

11. Heating jacket according to one of claims 1 to 10, characterized in that the inner layer (2) and / or the outer layer (3) of the heating jacket (1) consists of a vulcanized rubber mixture / consist, comprising at least one rubber component and Mischungsingredienzien.

12. Heating jacket according to claim 11, characterized in that the inner layer (2) and the outer layer (3) of the heating jacket (1) consist of a vulcanized rubber mixture.

13. Heating jacket according to claim 11 or 12, characterized in that the rubber component of the inner layer (2) of the heating jacket (1) an ethylene-propylene copolymer (EPM), an ethylene-propylene-diene Mischpolymerisysat (EPDM), a (part ) is hydrogenated nitrile rubber (HNBR), butyl rubber (HR), fluororubber (FKM) or silicone rubber (MVQ).

14. Heating sleeve according to claim 13, characterized in that the

Rubber component of the inner layer (2) of the heating jacket (1) is an ethylene-propylene-diene copolymer (EPDM).

15. Heating jacket according to one of claims 11 to 14, characterized in that the rubber mixture of the inner layer (2) of the heating jacket (1) is sulfur-crosslinked or crosslinked peroxide.

16. Heating jacket according to one of claims 11 to 15, characterized in that the rubber component of the outer layer (3) of the heating jacket (1) is gas-tight.

17. Heating jacket according to claim 16, characterized in that the

Rubber component of the outer layer (3) of the heating jacket (1) is butyl rubber (HR), bromobutyl rubber (BIIR) or chlorobutyl rubber (CUR).

18. Heating jacket according to claim 17, characterized in that the

Rubber component of the outer layer (3) of the heating jacket (1) is butyl rubber (HR).

19. Heating jacket according to one of claims 11 to 18, characterized in that the rubber mixture of the outer layer (3) of the heating jacket (1) is resin crosslinked.

20. Heating jacket according to one of claims 1 to 19, characterized in that the inner layer (2) of the heating jacket (1) has a layer thickness of 3 to 10 mm.

21. Heating jacket according to claim 20, characterized in that the inner layer (2) of the heating jacket (1) has a layer thickness of 5 to 7 mm.

22. Heating jacket according to one of claims 1 to 21, characterized in that the outer layer (3) of the heating jacket (1) has a layer thickness of 1 to 7 mm having.

23. Heating jacket according to claim 22, characterized in that the outer layer (3) of the heating jacket (1) has a layer thickness of 1.5 to 4 mm.

24. Heating jacket according to one of claims 1 to 22, characterized in that the heating sleeve (1) is provided with an intermediate layer (12) which connects the inner layer (2) with the outer layer (3), wherein the intermediate layer free of a bonding agent or prepared with a primer.

25. Heating jacket according to claim 24, characterized in that the

Intermediate layer (12) consists of a nonwoven, knitted fabric or woven fabric.

26. Heating jacket according to one of claims 1 to 25, characterized in that at least one end face, in particular both end faces of the heating jacket (1) is provided with a shoulder (13) is / are.

27. Heating jacket according to claim 26, characterized in that the shoulder (13) is a part of the outer layer (3) and consists of the same material as the outer layer.

28. Heating jacket according to claim 26 or 27, characterized in that the shoulder (13) has a paragraph dimension of 5 to 50 mm.

29. Heating jacket according to claim 28, characterized in that the shoulder (13) has a paragraph dimension of 5 to 15 mm.

30. Heating sleeve according to one of claims 1 to 29, characterized in that the inner layer (2) of the heating jacket (1) in the vulcanization phase has a higher hardness in S hear A than the vulcanized tubular article (4).