WO2009156330A1

WO2009156330A1 - Composite material for thermal insulation and sound insulation and method for the manufacture thereof as well as household appliance

Info

Publication number: WO2009156330A1
Application number: PCT/EP2009/057608
Authority: WO
Inventors: Egbert Classen
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2008-06-27
Filing date: 2009-06-18
Publication date: 2009-12-30
Also published as: DE102008030539A1; CN102077273A; EP2304715A1; DE102008030539B4

Abstract

The object of providing a composite material for thermal insulation and sound insulation, said material having a much better insulating effect than the prior art, is met by the composite material for thermal and sound insulation according to the invention, said material comprising individual flat layers of different materials, wherein at least three layers (1, 2, 3) are used and wherein the material of the outer layers (1, 2) is adapted for weaving through the at least one middle (3) layer. A granular stone layer is applied to an outer soft-meltable bitumen layer (1) with/without powdered stone filling, and on top of this at least one middle layer (3) is applied a final soft-meltable bitumen layer (2) with/without powdered stone filling, wherein the aggregate condition of both outer bitumen layers (1, 2) is selected such that soft-meltable bitumen of the top layer (2) flows through the at least one middle layer (3) to the bottom layer (1), finally cures in the bottom bitumen layer (1) and thus forms a weaving of the at least one middle layer (3).

Description

Composite material for thermal insulation and sound insulation, as well as methods for its production and household appliance

The invention relates to a composite material for thermal insulation and sound insulation and to a method for its production. Furthermore, the invention relates to a

Domestic appliance, in particular a dishwasher or washing machine, which is covered with a composite material for thermal insulation and sound insulation.

From DE 198 58 002 A1 a noise and heat insulation of bitumen material, in particular for washing containers made of metal for dishwashers is known. The noise and heat insulation of bituminous material is essentially composed of a bituminous material layer, in order to achieve improved thermal insulation in the boundary layer to the sheet material of the Spülbehälters a mechanically stable, thermal insulating layer is taken, which may consist of expanded glass granulate or expanded clay. The boundary layer can additionally be provided on the container side with a contact adhesive, which produces the detachable connection between the insulation and the sheet material of the washing container. Despite the use of expanded glass granules or expanded clay in the boundary layer, the noise and heat insulation is not optimal.

Object of the present invention is therefore to provide a composite material for thermal insulation and sound insulation, which has a much better than the prior art insulation and insulation effect. A further object of the present invention is to provide a method for producing a composite material for better thermal insulation and sound insulation. Furthermore, it is an object of the present invention to provide a household appliance with better heat and sound insulation.

These objects are achieved by the composite material according to the invention with the features according to claim 1, and by the household appliance with the features according to the further independent claim, and finally by the inventive method for producing a composite material with the features according to the next further independent claim solved. Advantageous developments of the present invention are characterized in the subclaims.

The composite material according to the invention for thermal insulation and sound insulation consists of individual laminar layers of different materials, wherein at least three layers are used, and the material of the respective outer layers is such that a penetration of the at least one middle layer takes place.

Advantageously, the wetting is essentially formed by webs of bitumen which extend through the at least one middle layer.

According to the invention, the outer layers are essentially made of a bituminous material and, in different embodiments of the invention, may consist of a mixture of bituminous material with stone powder. The advantage of adding stone powder is the increase in sound insulation, because stone dust has a higher absorption potential than pure bitumen due to its specific density.

Preferably, the wetting takes place essentially through the bitumen material.

The at least one middle layer consists of a preferred embodiment of the invention of an open or large pored material. This open or large pore material is such that molten bitumen can flow from the topsheet toward or even into the backsheet, so that after curing of the bitumen, webs between the top and bottom outer layers extend through the at least one middle layer ,

Alternatively, such open or large-pored materials may be, for example, stone granules or gravel or even glass beads.

With the composite material according to the invention, the respective positive properties of the individual layers are optimally interconnected. The Bituminous sheets on the respective outer sides of the composite material have a high level of noise insulation and the stone granulate layer has, depending on the air circulation, a relatively high thermal insulation or thermal conductivity. With the same web thickness, less bitumen is thus used compared to conventional materials, but with higher noise insulation and better insulating properties.

With the present invention, it has therefore been possible to provide a composite material for thermal insulation and sound insulation, which has a much better than the prior art insulation and insulation effect.

According to the inventive method for producing a composite material for noise reduction and sound insulation, consisting of individual sheet layers, a stone granulate layer is applied to an outer melted bituminous layer with / without stone dust filling and applied over this at least one middle layer a final melted bituminous layer with / without stone dust filling, said the state of aggregation of the two outer bituminous layers is selected such that melted bitumen of the upper layer flows through the at least one middle layer into the lower layer, finally hardens in the lower bituminous layer and thus forms a penetration of the at least one middle layer. This penetration strengthens the bond of the respective layers to provide a uniform insulation and noise isolation path.

With the present invention, it has been possible to provide a method for producing the composite material according to the invention for better thermal insulation and sound insulation.

In the household appliance according to the invention, in particular dishwashing or washing machine, whose rinsing or tub container is covered by means of the composite material according to the invention.

Advantageously, the composite material is glued or fused onto the rinsing or lye container. According to a preferred embodiment of the invention, the open or large-pored material is such that the at least one middle layer is ventilated via corresponding ventilation means. In the household appliance according to the invention, the at least one middle layer of the composite material according to the invention, which consists of large or open-pored material, flows through an air flow by means of a corresponding blower, so that the heat dissipation from the rinse or tub can be increased. During the drying phase, it may therefore be advantageous to achieve a rapid heat removal from the rinsing or tub, so that by a corresponding condensation on the inner wall of the Spülbzw. Laugenbehälters the drying process of the rinse or laundry is accelerated. During the cleaning and rinsing phase, on the other hand, an air circulation is prevented so that there is a high heat-insulating effect in the at least one middle layer.

With the present invention, a household appliance is created with better heat and sound insulation.

The present invention will be explained in more detail with reference to a preferred embodiment in the following drawings. Show it:

Figure 1 is a sectional view through the invention

Composite;

Figure 2 is a sectional view through the invention

Composite during the manufacturing process and

Figure 3 is a schematic side view of a partially illustrated inventive household appliance.

Figure 1 shows a cross section through a composite material according to the invention with a lower layer 1, a middle layer 3 and an upper layer 2. The two outer layers 1 and 2 consist of a bitumen material, which may be suitably enriched with stone powder. The advantage of a Stone dust is the increase in sound insulation, because stone dust has a higher absorption potential than pure bitumen due to its specific density.

However, the addition of stone powder does not have to be carried out in both outer bituminous layers, but can be present in only one of the two layers 1 or 2. Conveniently, however, in the production of the composite material according to the invention, the outer bituminous layer is not enriched with rock meal or not to the same extent as the lower layer, since a certain viscosity of the bitumen is necessary for the formation of the webs 4a to 4z, and this viscosity by the admixture of Stone meal can be negatively influenced.

In a particularly advantageous embodiment of the composite material according to the invention, therefore, the lower layer 1 has a higher stone powder concentration than the upper layer 2. The upper layer 2 is connected to the lower layer via a plurality of webs 4a to 4 z, so that the relatively loose at least one middle layer 3 is reliably held in the composite.

With the composite material according to the invention, the respective positive properties of the individual layers are optimally interconnected. The bituminous sheets on the respective outer sides of the composite material have a high noise insulation and the stone granulate layer has, depending on the air circulation, a relatively high thermal insulation or thermal conductivity. With the same web thickness, less bitumen is thus used compared to conventional materials, but with higher noise insulation and better insulating properties.

FIG. 2 shows the production method of the composite according to the invention. On the enriched with or without stone powder lower bituminous layer 1 is by means of an unspecified, suitable device 5 stone granules or a corresponding structure, such as gravel, glass beads or other flowable particles having a favorable thermal transfer property applied. After or during the application of the pourable Guts 3, the still meltable upper layer 2 is applied, which, due to the viscosity of the melted bitumen, following gravity, lowers and partially webs forms 4a to 4z, which may extend into the lower layer 1 , In some areas, however, it may also be the case that the webs do not extend into the respective other outer layer but already solidify in the at least one middle layer.

After completion of the composite material according to the invention this can be cut into webs and permanently connected by means of adhesive layer or other meaningful joining method with the outer wall of a washing or lye container.

In order to achieve even higher thermal insulation or sound insulation, it is also conceivable to provide several middle layers of different consistency. For the durability and processability of the composite material according to the invention, it is only necessary that the respective outer layers 1, 2 are connected to one another via the penetration of webs 4a to 4z in such a way that a uniform composite material is produced. It is therefore conceivable to arrange a stone granule layer and a glass bead layer one above the other and to optimally use the respective physical properties of the individual layers for sound insulation and thermal insulation or removal.

In Figure 3 is a partial view of a household appliance not shown in detail is shown, in the embodiment shown a dishwasher, wherein the walls 7 whose treatment container - the rinse tank - is coated with the composite material according to the invention.

To support the thermal insulation or heat dissipation, a blower 6 is attached to the cross-section of the composite material according to the invention that a certain air circulation can be formed by the open-pore and large-pored middle layer 3. For example, during the drying phase, air circulation can transport the residual heat contained in the washing container more quickly to the outside, since the heat conduction coefficient α at the boundary surface of the stone granules is substantially increased by the air circulation. If, however, a thermal insulation is desired during the warm-up phase, which prevents heat removal from the washing compartment, then air circulation would be prevented and the open-pored and large-pored material of the at least one middle layer 3 would have an insulating effect.

The composite material according to the invention thus has the advantage of optimally influencing the thermal insulation or heat dissipation and sound insulation, in particular in a dishwashing machine, since the respective layers of the composite material can optimally unfold their technical properties at different times in the washing program.

The technical effect of the respective layers can be significantly influenced by the addition of air circulation, so that the energy consumption of a household appliance, in particular a dishwasher, is favorably influenced by the composite material according to the invention.

Claims

claims

1. composite material for noise reduction and sound insulation, consisting of individual sheet-like layers of different materials, characterized in that at least three layers (1, 2, 3) are used, and the material of the respective outer layers (1, 2) is arranged in that a penetration of the at least one middle layer (3) takes place.

2. Composite material according to claim 1, characterized in that the

Durchnetzt essentially by webs (4a - 4z) is formed, which extend through the at least one middle layer (3).

3. Composite material according to claim 2, characterized in that the outer layers (1, 2) consist essentially of a bitumen material.

4. Composite according to claim 2, characterized in that the outer layers (1, 2) consist of a mixture of bitumen material and stone powder.

5. Composite material according to one of claims 3 or 4, characterized in that the Durchnetzung takes place substantially through the bitumen material.

6. Composite material according to one of the preceding claims, characterized in that the at least one middle layer (3) consists of an open or large pored material.

7. A composite material according to claim 6, characterized in that the open or large-pored material is stone granules or gravel or consists of glass beads.

8. Household appliance, in particular dishwashing or washing machine whose Spülbzw. Lye container is covered by a composite material according to one of the preceding claims.

9. Household appliance according to claim 8, characterized in that the composite material is glued or melted onto the rinsing or tub.

10. Household appliance according to claim 9, characterized in that the open or large-pored material is such that the at least one middle layer (3) via corresponding ventilation means (6) is designed to be ventilated.

11. A method for producing a composite material for noise reduction and sound insulation, consisting of individual sheet layers (1, 2, 3), characterized in that a stone granulate layer is applied to an outer melted bituminous layer with / without stone dust filling and on this at least one middle layer one final aggregate state of the two outer bituminous layers is selected such that molten bitumen of the upper layer (2) flows through the at least one middle layer (3) into the lower layer (1) finally hardens lower bituminous layer and thus forms a Durchnetzung the at least one middle layer (3).