DE102008038322A1 - Heating sleeve as a component of a vulcanization device, in particular for producing an endlessly closed drive belt - Google Patents

Abstract

The invention relates to a heating sleeve (1) as a component of a vulcanization device for producing a tubular article, in particular in the form of an endless drive belt, comprising a base body of a vulcanizable material, wherein the heating sleeve (1) consists of a polymer material which is stable under vulcanization conditions, wherein According to the invention, the heating sleeve (1) has 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). The inner layer (2) of the heating sleeve (1) in the vulcanization phase preferably has a higher hardness in Shore A than the article to be vulcanized, which is the case in particular in drive belts. The inner layer (2) preferably consists of a sulfur-crosslinked or peroxidically crosslinked EPDM mixture having a hardness of 82 to 89 Shore A at a layer thickness of 5 to 7 mm. The outer layer (3) consists in particular of a resin-crosslinked butyl rubber mixture having a hardness of 64 to 75 Shore A at a layer thickness of 1.5 to 4 mm. Further design variants of the heating jacket are presented.

Description

The The invention relates to a heating sleeve as a component of a vulcanization device for producing a tubular article with a base body made of a vulcanizable material, with the heating sleeve off a polymer resistant to vulcanization conditions Material exists.

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 regard, 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 3,981,206 and US 5,417,618 ,

The Elasticity of the tubular article below Inclusion of bending elasticity, which is especially true for drive belts is important, is achieved by the fact that the main body consists of a polymeric material with elastic properties, Here, the two material groups elastomers and thermoplastic Elastomers (TPE) are mentioned. Most elastomers come on the basis vulcanizable rubber mixtures comprising at least one Rubber component (eg EPM, EPDM, HNBR, FKM) as well as mixture ingredients, for use. The mixture ingredients comprise at least a crosslinker or a crosslinker system (crosslinking agent and Accelerator). Other mixture ingredients are mostly still a filler and / or a processing aid and / or a plasticizer and / or an aging inhibitor and optionally other additives (eg fibers, color pigments). In this regard, becomes the general state of rubber compounding technology directed.

Of the elastic basic body of the tubular article is still mostly with an embedded strength element or Zugträger provided running one or more layers can be.

• – geometrische Instabilität, beispielsweise durch Schrumpfung in der Höhe und durch Umfangszunahme;
• – mangelnde Standfestigkeit;
• – zu geringe Härte in Verbindung mit Rückenwelligkeitseffekten, insbesondere bei Antriebsriemen, insbesondere wiederum bei Zahnriemen.

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, they should contribute to the smoothing of the article back, in particular belt back. The heating jacket consists of a under vulcanization (130 to 200 ° C) resistant polymeric material. So far, the heating jackets were made in a single layer of 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 is the object of the invention to provide a heating jacket, with a safe Sealing of the boiler system against steam entry into the Vulkanisatbereich is guaranteed. In addition, the heating jacket should to a reliable smoothing of the back structure an article, in particular a drive belt contribute.

Solved This object is achieved in that the heating jacket at least one Inner layer and an outer layer, wherein the Inner layer of a harder material than the Outer layer.

The Heating jacket passes in particular in the manufacture of a hose, in particular a short tube, a bellows (Axialbalg, Kreuzlagenbalg), a compensator, an endless belt, endless belt or endless belt for use. Of paramount importance is the Use of the new heating jacket in the production of an endless closed flexural elastic drive belt, constructive designed as a flat belt, V-belt, V-ribbed belt or toothed belt can be.

The Inner layer of the heating sleeve is in contact with the Article back or in relation to the main application to the back of the belt. In the vulcanization of the article blank or belt blanks is due to the hard-soft combination of the heating jacket an effective smoothing of the back structure of the Or belt achieved, with simultaneous sealing against steam entry into the Vulkanisatbereich.

Regarding 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 turn, 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 mixture is especially crosslinked with sulfur 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.

Except the aforementioned rubber components may also others Rubber grades trimmed to a hardness of> 80 Shore A. become. Particularly noteworthy here are a (partially) hydrogenated nitrile rubber (HNBR), butyl rubber (IIR), fluororubber (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, especially again from 64 to 75 Shore A, up.

To the Insert also gets a vulcanized rubber compound, in which case in particular a gas-tight rubber component, the Butyl rubber (IIR), bromobutyl rubber (BIIR) or chlorobutyl rubber (CIIR) is used. The preferred rubber component is IIR. The rubber mixture is in particular resin crosslinked, for example by means of a phenolic resin. Regarding the others Mixture ingredients is the same as 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 in Mentioned in connection with the description of the figures.

The Invention will now be based on embodiments below Referring to schematic drawings explained. Show it:

1 the circumferential section of a heating jacket without intermediate layer;

2 the longitudinal section of a heating jacket without intermediate layer;

3 the longitudinal section of a toothed belt;

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

5 the longitudinal section of a heating jacket with intermediate layer;

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

7 the longitudinal section of a heating jacket with heel and intermediate layer.

The heating sleeve 1 to 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.

3 now shows the section of a tubular article 4 in the form of an endlessly closed drive belt, which in turn is designed here as a toothed belt. The timing belt has a cover layer 5 with cover layer surface 6 as well as a substructure 8th with a tooth-shaped substructure surface 9 as a power transmission zone. The top layer 5 , which is also called belt back, and the substructure 8th form as a whole unit the elastic body, which consists of a vulcanizable rubber mixture. The rubber component used 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). In the main body are also several parallel tensile cords 7 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 with an abrasion resistant coating 10 provided, for example in the form of a textile cover (fabric, knitted fabric, knitted fabric), which in order to oil resistance additionally with a plastic material, for example by means of a fluorine-containing plastic (eg., PTFE), sealed.

The cover layer surface 6 is usually also with a coating 11 provided, 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 is preferably carried out 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 or with the substructure 8th ,

When vulcanizing the belt blank has the inner layer 2 the heating sleeve 1 Contact with the back of the belt, either with the coating 11 or in a coating-free design with the cover layer surface 6 , In both cases, a smoothing of the back structure of the toothed belt is achieved with the new heating sleeve.

The inner layer 2 the heating sleeve 1 has in the vulcanization phase a higher hardness in Shore A than the tubular article to be vulcanized. This is of particular importance in the case of shaped articles, in which case the drive belt should be mentioned in the first place. 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 presented.

The heating sleeve 1 to 4 and 5 is additionally with an intermediate layer 12 provided the inner layer 2 with the outer layer 3 combines. 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 (Chemetal)
Megum (Chemetal)
Thixon (Morton)
Cilbond (Cil)
Parlock (Lord)

To 6 is the heating cuff 1 , which has no intermediate layer, at its two end faces (sealing surfaces), each with a paragraph 13 Mistake. 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.

7 shows a heating jacket 1 , which at their two end faces (sealing surfaces) also each with a paragraph 13 is provided, but here additionally an intermediate layer 12 is available.

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 ,

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

1

Heating jacket (Vulkanisationsmanschette)

2

inner layer

3

outer layer

4

tubular Article in the form of an endlessly closed drive belt

5

topsheet (Back of the belt)

6

Liner surface

7

tension members (Tension member)

8th

substructure

9

base surface (Power transmission zone)

10

coating

11

coating

12

interlayer (Compound layer)

13

paragraph at the end faces (sealing surfaces) of the heating sleeve

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 102006007509 A1 [0002]
• WO 2005/080821 A1 [0002]
• WO 2006/066669 A1 [0002]
• US 3981206 [0002]
• US 5417618 [0002]

Claims (30)

Heating sleeve ( 1 ) as a component of a vulcanization device for producing a tubular article ( 4 ) with a base body of a vulcanizable material, wherein the heating sleeve ( 1 ) consists of a polymer material which is stable under vulcanization conditions , characterized in that the heating sleeve ( 1 ) at least one inner layer ( 2 ) and an outer layer ( 3 ), wherein the inner layer ( 2 ) consists of a harder material than the outer layer ( 3 ). Heating sleeve according to claim 1, characterized in that the heating sleeve ( 1 ) for the vulcanization of a hose, air bellows, compensator, an endless belt, endless belt or endless belt used. Heating sleeve ( 1 ) as a component of a vulcanization device for producing a tubular article ( 4 ) in the form of an endlessly closed drive belt with a body made of a vulcanizable material, wherein the heating sleeve ( 1 ) consists of a polymer material which is stable under vulcanization conditions, characterized in that the heating sleeve ( 1 ) at least one inner layer ( 2 ) and an outer layer ( 3 ), wherein the inner layer ( 2 ) consists of a harder material than the outer layer ( 3 ). Heating jacket according to claim 3, characterized in that the heating sleeve ( 1 ) is used for the production of a flat belt, V-belt, V-ribbed belt or toothed belt. 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. Heating sleeve according to claim 5, characterized in that the inner layer ( 2 ) of the heating jacket ( 1 ) has a hardness of 81 to 95 Shore A. 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. 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. Heating jacket according to claim 8, characterized in that the outer layer ( 3 ) of the heating jacket ( 1 ) has a hardness of 60 to 79 Shore A. 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. Heating sleeve 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 containing at least one rubber component as well as mixture ingredients. 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. Heating jacket according to claim 11 or 12, characterized in that the rubber component of the inner layer ( 2 ) of the heating jacket ( 1 ) is an ethylene-propylene copolymer (EPM), an ethylene-propylene-diene copolymer (EPDM), a (partially) hydrogenated nitrile rubber (HNBR), butyl rubber (IIR), fluororubber (FKM) or silicone rubber (MVQ). 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). 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 peroxide crosslinked. Heating sleeve 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. Heating sleeve according to claim 16, characterized in that the rubber component of the outer layer ( 3 ) of the heating jacket ( 1 ) Is butyl rubber (IIR), bromobutyl rubber (BIIR) or chlorobutyl rubber (CIIR). Heating sleeve according to claim 17, characterized in that the rubber component of the outer layer ( 3 ) of the heating jacket ( 1 ) Butyl rubber (IIR) is. Heating sleeve according to one of claims 11 to 18, characterized in that the chewing Shake mixture of the outer layer ( 3 ) of the heating jacket ( 1 ) is resin crosslinked. 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. 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. 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. 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. Heating sleeve according to one of claims 1 to 22, characterized in that the heating sleeve ( 1 ) with an intermediate layer ( 12 ), which is the inner layer ( 2 ) with the outer layer ( 3 ), wherein the intermediate layer is prepared free of an adhesion promoter or with a bonding agent. Heating sleeve according to claim 24, characterized in that the intermediate layer ( 12 ) consists of a nonwoven, knitted fabric, knitted fabric or fabric. Heating sleeve according to one of claims 1 to 25, characterized in that at least one end face, in particular both end faces, of the heating sleeve ( 1 ) with a paragraph ( 13 ) is / are provided. Heating jacket according to claim 26, characterized in that the shoulder ( 13 ) a part of the outer layer ( 3 ) and is made of the same material as the outer layer. Heating jacket according to claim 26 or 27, characterized in that the shoulder ( 13 ) has a paragraph dimension of 5 to 50 mm. Heating jacket according to claim 28, characterized in that the shoulder ( 13 ) has a paragraph dimension of 5 to 15 mm. Heating jacket according to one of claims 1 to 29, characterized in that the inner layer ( 2 ) of the heating jacket ( 1 ) in the vulcanization phase a greater hardness in Shore A than the tubular article to be vulcanized ( 4 ) Has.