DE29723762U1 - Chimney insulation sleeve - Google Patents

Description

Grünzweig + Hartmann AG
Mayor-Grünzweig-Str. 1

DE-67059 Ludwigshafen

Herne

25 November 1998

B 73583 DE (BO/TB/JO)

Chimney insulation sleeve

The present invention relates to chimney insulation sleeves as described in the preamble of claim 1.

When constructing three-wall chimneys, for example, which are widely used today, it is a well-known procedure to insert chimney inner pipe elements consisting of an inner pipe and an insulation layer applied to it into prefabricated chimney casings.

Such an element is known, for example, from the document DE 37 31 550 Cl, where it is described that the prefabricated chimney inner pipe element, which can be inserted into a prefabricated chimney casing with clearance, consists of an inner pipe, a thermal insulation layer applied to the outer surface of the inner pipe and a heat insulation layer surrounding and

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the thermal insulation layer is kept compressed. The material is wrapped around the inner tube and connected to each other in a suitable manner at the interface.

Furthermore, the document DE-OS 28 38 943 discloses a covering for insulating pipes, which is formed from strips of fibrous mineral material attached to a flexible carrier layer, the layers of the flexible carrier layers superimposed on the outside of an insulating pipe being connected to one another.

The connection used in the joint area of the insulation sleeve in the aforementioned state of the art involves a construction and assembly-related effort and is therefore disadvantageous.

The particular problem with insulation sleeves is that the material strips or carrier layers surrounding the thermal insulation layer, when used on chimney pipes, hot steam pipes or similar, can come apart at the points where the material strips or carrier layers have a seam, which carries the risk of coming apart due to the effects of temperature and moisture. However, if the seams of the carrier layers or material strips around the thermal insulation layers come apart, the proper functioning of the insulation elements can no longer be guaranteed.

The object of the present invention is therefore to provide a chimney insulation sleeve that is simple in construction and assembly and durable in the connection area, the butt-side connection of which is insensitive to temperature and moisture effects, e.g. when used on chimney pipes and hot steam pipes.

This object is achieved by the characterizing features of claim 1, with expedient embodiments being described by the subclaims.

A chimney insulation sleeve is provided, consisting of an insulation element made of mineral wool in the form of a track plate, a slatted plate or an equivalent mineral wool element, onto which a material sheet, for example a glass fleece or something similar, is laminated. This chimney insulation sleeve is preferably designed as a pipe shell-like element which has only one cut around the circumference so that it can be placed on a chimney inner pipe, a hot steam pipe or something similar.

The interface in the chimney insulation sleeve forms a joint area, which, according to the invention, is preferably sealed over the entire length of the cut by an adhesive tape made of glass fabric, aluminum foil or the like. This adhesive tape is preferably ironed onto the material web laminated to the insulation element over the entire length of the joint area of the chimney insulation sleeve, with a point-applied adhesive preferably being used to attach the adhesive tape. This creates a practically inseparable connection.

The adhesive used is preferably a thermosetting adhesive, the main component of which is phenolic resin and the rest consists of a thermoplastic. The mixture preferably consists of 50 to 80% by weight phenolic resin and 20 to 50% by weight thermoplastic. Suitable thermoplastics include polyvinyl acetate, copolymers, polyethylene, polyester and so on, where the thermoplastic in the adhesive has the great advantage of making the naturally very brittle phenolic resin more elastic.

An embodiment of the present invention is shown in the attached Figure 1.

A chimney inner pipe 1 can be seen, on which an insulating element 2 made of mineral wool in the form of a track plate or lamella mat is arranged. As can be seen, in the exemplary embodiment shown, the insulating element is in the form of a pipe shell-like element that only has one interface 3 with a corresponding joint area. The insulating element 2 made of mineral wool is also surrounded by a material web 4, which in the exemplary embodiment shown is a glass fleece that is laminated onto the insulating element 2.

In the illustrated embodiment, the insulation element 2 is sealed in the joint area 3 by an adhesive tape 5, which, as shown, extends over the entire length of the cut in the insulation element 2. In the present embodiment, the adhesive tape 5 is a glass fabric, although aluminum foil or another suitable material can also be used.

In the embodiment shown, the adhesive tape 5 is attached to the material web 4, which surrounds the insulation element 2, by means of a point-shaped adhesive applied by ironing.

In the embodiment shown, a mixture of 60% 100% phenolic resin powder and 40% polyester-polyurethane dispersion is preferably used as the adhesive for attaching the adhesive tape 5. A suitable adhesive is, for example, "Emoldur" 40% from BASF. In the embodiment shown, both components are mixed together with a paste-like adhesive, which is applied in dots to the adhesive tape, here the glass fabric strip, via a perforated sheet. The adhesive strip 5 is also ironed on at around 200 ^° C, whereby the adhesive melts and hardens irreversibly.

Claims (8)

Expectations 1. Insulating sleeve made of mineral wool, in particular for enveloping chimney inner pipes (1) which can be inserted into chimney casing bricks, hot steam pipes and the like, consisting of an insulating layer (2) and a jacket layer (4) surrounding it, the combination of insulating layer (2) and jacket layer (4) having at least one interface (3) with an abutting edge, characterized in that the interface (3) is closed by an adhesive tape (5) which connects the insulating sleeve at its two abutting edges and which has a thermosetting adhesive. 2. Insulation sleeve according to claim 1, characterized in that the thermosetting adhesive is applied in dots to the adhesive tape (5). 3. Insulating sleeve according to claim 1 or 2, characterized in that the adhesive tape (5) is connected to the sheath layer (4) by ironing. 4. Insulating sleeve according to one of the preceding claims, characterized in that the adhesive for fastening the adhesive tape (5) to the jacket layer (4) in the joint region (3) is a mixture of phenolic resin and a thermoplastic. 5. Insulating sleeve according to one of the preceding claims, characterized in that the adhesive consists of 50 to 80 wt.% phenolic resin and 20 to 50 wt.% thermoplastic. 6. Insulation sleeve according to one of the preceding claims, characterized in that the insulating layer (2) is a a pipe bent end to end and that the jacket layer (4) consists of a glass fleece laminated onto the insulation layer (2). 7. Insulating sleeve according to one of the preceding claims, characterized in that the adhesive tape (5) is formed from a glass fabric strip. 8. Insulation sleeve according to one of the preceding claims, characterized in that the adhesive tape extends continuously over the entire joint length or is applied in sections.