EP2484266A2 - Dishwasher and method for fixing an insulating material to a wall of a dishwasher - Google Patents

Abstract

The method involves bringing an insulating material (3) into contact with a wall by a robot. The insulating material is subsequently fixed at the wall by an infrared radiator unit such that a thermally activatable adhesive layer is activated by heat produced by the radiator unit during irradiation. The adhesive layer is arranged at the insulating material. A side of the wall lying opposite to the insulating material is radiated by the radiator unit from a distance of less than 20 mm. The radiator unit is operated before the insulating material is pressed against the wall using a form punch. An independent claim is also included for a dishwasher.

Description

The invention relates to a method for applying a, preferably flat, insulating material, in particular a bitumen mat, on at least one intended as an interior boundary of a dishwasher, in particular a domestic dishwasher, wall provided. Furthermore, the invention relates to a dishwasher, in particular domestic dishwasher, with an interior for receiving items to be cleaned and with several walls bounding the interior, for example in the form of a side wall, a movably mounted door wall, a back wall, a bottom wall and / or a top wall and a Dishwasher, wherein at least one of the walls on its side facing away from the interior, preferably a flat, insulating material, for example in the form of a bitumen mat has.

In the prior art it is known, Dämmmaterialien, for example in the form of bitumen mats, on the walls of the washing compartment of a dishwasher outside to install. The mats are in this case usually fixed with a spray adhesive on the outside of the respective wall or fixed by means of an attached to the mat adhesive layer on the wall. The thus provided outside on one or more walls with one or more bitumen mats washing container is driven by one or more ovens to bring the adhesive layer to harden.

The object of the invention is to propose a method by means of which the application of the insulating material can be accomplished inexpensively, quickly and reliably.

The problem is solved by means of the method according to independent claim 1.

In the method according to the invention, it is provided that the insulating material is brought into contact with the wall, preferably with the aid of a robot, and then fixed to the wall with the aid of at least one infrared radiator unit.

The inventive method allows fast, space-saving, cost-effective and also secure fixation of the insulating material. The advantage lies in particular in the fact that it is not necessary to heat the entire washing container, in particular not even the complete wall, as is the case according to conventional heating in an oven. Rather, the heating can be precisely controlled by the geometry and orientation of the first infrared radiator unit depending on the properties of the wall or the shape and size of the insulating material. The first infrared radiator unit may consist of several, possibly differently designed and / or aligned, infrared radiators to allow the most accurate adaptation of the radiation pattern or the beam intensity. In this way it is possible that only the areas of the wall are irradiated, to which the insulating material is to be applied. When the wall may be a flat or trough-shaped single wall such. B. a bottom trough of the washing container of the dishwasher act, which is connected after the insulation with one or more walls, for example, welded. Likewise, the wall may be formed as a U-shaped hood, wherein the legs form the side walls and the base of the U-shape in the later installed state in the dishwasher, the bottom wall, the back wall or the top wall of the resulting washing. The first infrared radiator unit can also be operated in particular pulsed during the fixation. In particular, the individual infrared radiators of the infrared radiator unit can be operated for different lengths and / or with different levels of intensity in order to be able to take into account the thickness distribution of the insulating material.

According to an advantageous development of the invention, the insulating material is fixed to the wall by activating a heat-activatable adhesive layer arranged on the insulating material during the irradiation by the heat generated by means of the infrared radiator unit. While insulating materials can be used after heating themselves have an adhesive property, it is useful in many cases, for example in the use of bitumen-containing insulating materials, to use an additional adhesive in the form of an adhesive layer. This can finally be selected depending on the desired adhesion, activation temperature (temperature at which the adhesive develops its adhesive properties), resistance, environmental compatibility and / or other relevant factors. The adhesive is preferably before the attachment of the insulating material on or on the wall, in particular on the washing compartment interior facing away from the outside of the wall, on the side facing the wall of the insulating material, in particular on its coming into contact with the wall bottom, area or applied in stripes or any other pattern.

According to an advantageous embodiment of the invention radiates the first infrared radiator unit for fixing the insulating material, in particular from a distance of less than 30 mm, preferably from a distance of less than 20 mm, on the insulating material opposite side of the wall, d. H. on the outside of the Spülbehälterinnenraum outside of the wall. Due to the relatively short distance, it is possible to keep the power consumption of the infrared radiator unit (s) as low as possible. Due to the fact that it is primarily not the insulating material but rather the side of the wall facing away from the insulating material, in particular the outside of the wall facing away from the washing compartment interior, that the jet duration and beam power of the first infrared radiator unit can be selected almost independently of the actual thickness of the insulating material. Even if this absorbs a certain amount of heat, the majority of the thermal energy introduced by the first infrared radiator unit is introduced directly via the wall into the region of the insulating material adjacent to the wall or the adhesive layer arranged between the wall and the insulating material. In this way, a rapid activation of the adhesive layer or the region of the insulating material, which is in contact with the wall takes place. This area or the adhesive layer unfolds by the activation of his or her adhesive properties, so that a secure fixation of the insulating material takes place with respect to the wall.

According to an advantageous embodiment of the invention radiates after the insulating material has been brought into contact with the wall and before the insulating material is fixed to the wall, at least a second infrared radiator unit on the wall facing away from the wall of the insulating material to the insulating material, in particular to a temperature between 40 ° C and 70 ° C, preferably to a temperature between 50 ° C and 60 ° C, to warm and soften it. This ensures that the insulating material clings to the wall as possible without appropriate gaps. As a result, there is a maximum contact surface between the wall and the insulating material or any existing adhesive layer, whereby a particularly reliable fixation of the insulating material and excellent insulation can be ensured by the insulating material.

According to an advantageous development of the invention, the insulating material, in particular after the irradiation with the aid of the second infrared radiator unit, is pressed against the wall with the aid of a forming die movable in relation to the wall. The above-described effect of a maximum contact area can thereby be further enhanced. In addition, the insulating material is replaced by the action of the forming die its desired shape, which generally corresponds to the surface shape of the insulating material facing side of the wall.

According to an advantageous embodiment of the invention, the first infrared radiator unit is operated before the insulating material is pressed by means of the forming die against the wall, in particular before the insulating material is brought into contact with the wall. As a result, there is a preheating of the wall, which ensures that the applied insulation material, in particular with the support of the forming punch, as completely as possible clings to the wall. The radiation intensity may be lower than in the subsequent fixation of the insulating material.

According to an advantageous embodiment of the invention can be dispensed with the use of a forming die to reduce the process steps and thus to minimize the total process time. In this case, it may be appropriate to direct the second infrared radiator unit on the side facing away from the wall of the insulating material after the insulating material has been brought into contact with the wall and before the insulating material is fixed to the wall to the insulation material to a temperature between 100 ° C and 150 ° C, preferably to a temperature between 120 ° C and 130 ° C, to warm and thereby soften. The insulating material, which is preferably present as a bitumen mat, in this case due to its specific thermal conductivity in a short time (usually within a few seconds) so soft that it adapts or clings to its own weight to the contour of the wall. Further pressing of the insulating material with the help of a forming punch is no longer necessary in this case. In order to effect softening and subsequent fixation of the insulating material, it may finally be additionally or alternatively provided that the two infrared units radiate together, wherein the corresponding jet duration may be, for example, between seven and twelve, preferably between eight and nine seconds.

According to an advantageous development of the invention, the first infrared radiator unit directed in the direction of the wall and the second infrared radiator unit directed in the direction of the insulating material start simultaneously with the irradiation. Whereas softening of the insulating material is effected by the second infrared radiator unit in order to allow the necessary contact between the wall and the insulating material which may be rigid when cold, the irradiation by the first infrared radiator unit ensures that the insulating material remains supple until the beginning of the fixation, so that the fixation can preferably take place in the region of the entire possible contact surface between the insulating material and the wall.

• An- bzw. Auflegen des Dämmmaterials an bzw. auf die zu bedämmende Wandung,
• Ausrichten der Wandung und/oder der ersten Infrarotstrahlereinheit, so dass die erste Infrarotstrahlereinheit auf die Wandung gerichtet ist sowie Positionieren einer zweiten Infrarotstrahlereinheit derart, dass die zweite Infrarotstrahlereinheit auf das Dämmmaterial gerichtet ist,
• Betrieb der zweiten Infrarotstrahlereinheit, insbesondere für weniger als 10 Sekunden, vorzugsweise für weniger als 5 Sekunden, um das Dämmmaterial zu erweichen,
• Betrieb der auf die Wandung gerichteten, ersten Infrarotstrahlereinheit, um die Wandung zu erwärmen,
• Entfernen der zweiten Infrarotstrahlereinheit (nur falls ein Formstempel zum Einsatz kommt),
• eventuell Anpressen des Dämmmaterials an die Wandung mit Hilfe eines in Richtung des Dämmmaterials verfahrbaren Formstempels,
• Betrieb der ersten Infrarotstrahlereinheit, insbesondere für weniger als 15 Sekunden, vorzugsweise für 8 bis 10 Sekunden, um das Dämmmaterial an der Wandung zu fixieren, indem insbesondere eine an dem Dämmmaterial angebrachte, wärmeaktivierbare Kleberschicht durch die mit Hilfe der ersten Infrarotstrahlereinheit erzeugte Wärme aktiviert wird.

According to an advantageous development of the invention, the method comprises the following steps:

• Applying or laying the insulating material on or on the wall to be insulated,
• Aligning the wall and / or the first infrared radiator unit, so that the first infrared radiator unit is directed to the wall and positioning a second infrared radiator unit such that the second infrared radiator unit is directed to the insulating material,
• Operating the second infrared radiator unit, in particular for less than 10 seconds, preferably for less than 5 seconds, to soften the insulating material,
• Operation of the wall-facing first infrared radiator unit to heat the wall,
• Removing the second infrared radiator unit (only if a forming punch is used),
• possibly pressing the insulating material to the wall by means of a movable in the direction of the insulating material form punch,
• Operating the first infrared radiator unit, in particular for less than 15 seconds, preferably for 8 to 10 seconds, to fix the insulating material to the wall, in particular by activating a heat-activatable adhesive layer attached to the insulating material by the heat generated by means of the first infrared radiator unit.

This process allows a particularly energy-efficient fixation, wherein the respective steps, as far as technically possible and useful, can be carried out simultaneously or even sequentially.

According to an advantageous embodiment of the invention, an insulating material is used, whose at least one side of an insulating layer, in particular a sound insulation layer and / or thermal insulation layer comprises, wherein the insulating layer preferably on its side facing away from the insulating material has a heat-activatable adhesive layer, with the help of the insulating material is fixed to the wall. The material to be applied to the wall in this case has the layer sequence adhesive layer insulation layer insulating material. Since there is always a heating through the adjacent wall of the adhesive layer, the height or the type of insulation layer is not essential in the fixation of the insulating material. Rather, it can always be ensured by the method according to the invention that the adhesive layer is activated by means of the infrared radiator unit through the wall and thus fixes the insulating material to the wall. The insulating layer can be the same material that makes up the insulating material. Alternatively, however, other materials can be selected which can be selected with regard to vibration insulation, sound insulation and / or thermal insulation.

A dishwasher according to the invention is finally distinguished by the fact that at least one of the walls, according to a method according to the preceding Description applied, preferably flat, insulating material, for example in the form of a bitumen mat, wherein the insulating material is disposed on the side facing away from the interior of the wall. The dishwasher according to the invention is characterized by a cost-effective production, while still a secure fixation of the insulating material can be ensured on the respective wall.

According to an advantageous embodiment of the invention, the insulating material is fixed to the wall by means of an adhesive layer which is arranged between the wall and the insulating material. This may be, for example, a polyurethane adhesive, which can be activated by means of heat energy. The adhesive can be applied to the insulating material over the entire surface or even only on individual areas (corner or edge areas, neighboring areas of openings).

According to an advantageous embodiment of the invention, an insulating layer, in particular a sound insulation layer and / or thermal insulation layer is disposed between the adhesive layer and the insulating material to enhance the insulating effect of the insulating material or to introduce further advantageous properties in the resulting layer material.

A further dishwashing machine according to the invention is finally characterized in that the insulating material or an adhesive layer with the aid of which the insulating material is fixed to the wall has at least one first and at least one second area, the first area having a higher adhesive force than the wall the second area. Such areas may preferably be created by fixing the insulating material to the wall according to the method described above, wherein the one or more infrared radiator unit (s) used generate a corresponding radiation pattern. Such a pattern can be generated either by a corresponding geometry and / or mutual arrangement or else by the different beam duration of the individual infrared radiators of an infrared radiator unit. In any case, it comes through the use of multiple infrared radiators to a heat distribution, which fails in contrast to a heating of the wall in an oven is not homogeneous with respect to the entire wall. However, this can be done in an advantageous manner Use this way that the infrared radiators are aligned in coordination with the geometry of the wall and / or the insulating material. If, for example, a bottom wall, which structurally has an opening for the drainage of rinsing liquor, is provided with an insulating material likewise having an opening, it would be advisable to position rod-shaped infrared radiators in the area of the outer edges of the bottom wall and a circular infrared radiator in the area of the openings , After the irradiation of the wall are finally due to the inhomogeneous heat distribution in the region of the edges and openings areas arise that have an over the other areas increased adhesion, since a particularly high degree of activation of the adhesive layer or the insulating material can be achieved. In this case, in particular the force which would be necessary to detach the insulating material from the wall is defined as adhesive force, whereby the relative values of the respective adhesive forces of the individual regions are not important here, but rather the absolute values.

According to an advantageous development of the invention, the first region is arranged in the region of at least one corner, one edge and / or an opening of the wall, since in these regions a faster detachment of the insulating material can generally occur than in the intermediate regions.

According to an advantageous development of the invention, the adhesive layer in the first region with the higher adhesive force has a higher degree of polymerization than the adhesive layer in the second region. A high degree of polymerization usually occurs during activation of the adhesive layer, the degree usually depending on how fully the activation has occurred. Since in the areas in which the individual infrared radiators of the infrared radiator unit (s) bring the highest heat energy, a particularly complete activation takes place, these areas will also be characterized by a high degree of polymerization.

Figur 1

eine Darstellung eines vorteilhaften Ausführungsbeispiels einer erfindungsgemäßen Geschirrspülmaschine,

Figuren 2 bis 7

einen möglichen Ablauf des erfindungsgemäßen Verfahrens, und

Figur 8

ein mit einer Kleberschicht und einer Isolationsschicht versehenes und flächig ausgebildetes Dämmmaterial.

The above-explained and / or reproduced in the subclaims advantageous embodiments and refinements of the invention can - in addition to z. B. in cases of clear dependencies or incompatible alternatives - individually or in any combination with each other. The invention and its advantageous embodiments and further developments and advantages thereof are explained in more detail below with reference to drawings. They show, in each case in a schematic outline sketch:

FIG. 1

a representation of an advantageous embodiment of a dishwasher according to the invention,

FIGS. 2 to 7

a possible sequence of the method according to the invention, and

FIG. 8

a provided with an adhesive layer and an insulation layer and surface trained insulation.

In the following figures, corresponding parts are provided with the same reference numerals. Only those components are provided with reference numerals and explained, which are necessary for the understanding of the invention.

FIG. 1 shows a schematic representation of a dishwasher 1, wherein the representation is limited to what is necessary for understanding. Thus, the figure shows the actual body 14 of the dishwasher 1, in which in turn the inner washing container is arranged, which in the example shown has two side walls 2a, a back wall 2d, a bottom wall 2b and a top wall 2c, which in turn the interior 15 of the dishwasher. 1 limit. The bottom wall 25 may be formed in particular as a floor pan.

In the assembled state, the dishwasher 1 finally has a front wall of the interior 15 closing and movably mounted on the body 14 door wall, however, in FIG. 1 is not shown to ensure the view into the interior 15 of the dishwasher 1. Between the walls 2 and the body 14 are finally (also in the fully assembled state of the dishwasher 1), the respective components arranged, which are necessary for the operation of the dishwasher 1.

These include a usually arranged below the bottom wall 2b circulating pump, which is necessary to, if necessary, for example, with cleaning agents, rinse aids, additives, dirt particles, etc .. offset liquid such. As water, in particular a so-called rinsing liquor, in the direction of also not shown one or more spray arms extending into the interior 15 to promote. Furthermore, the dishwashing machine 1 usually comprises, after its assembly, a drain pump for pumping out contaminated liquid from the dishwasher 1, a heating device for heating the wash liquor and possibly an active drying device, for example in the form of a sorption drying device comprising a reversibly dehydratable drying agent which can simultaneously serve as a heating device ,

Furthermore, dishwashing baskets for receiving the items to be washed, which are mounted longitudinally displaceable, are generally arranged in the interior 15. Again FIG. 1 can still be seen, the bottom wall 2b in the illustrated embodiment, an opening 4. This serves as a drain opening for the rinsing liquor, which can get over this in a sump and with the interposition provided there, known filter devices for circulating and / or drain pump.

With regard to the present invention, reference is now made to the in FIG. 1 shown insulating material 3 referenced. This insulating material 3 (formed in the example shown as insulating mats, which may have a bitumen layer, for example) is usually applied to the interior 15 facing away from the sides of the aforementioned walls 2 to dampen vibrations or other noise and thus a quietest possible To ensure operation of the dishwasher 1. Furthermore, the insulating material 3 can also have heat-insulating properties which prevent the rinsing liquor or the ware from cooling too quickly. However, this is of priority when using an active drying device (for example, a Sorptionstrocknungsvorrichtung) of advantage, in which a condensation of water vapor on the inside of the walls 2 is not necessary for the drying. If, on the other hand, conventional condensation drying is used, it is advantageous to use as cool walls 2 as possible during the drying phase in order to allow the mentioned condensation.

The insulating material 3 itself can, as shown, lie flat against the entire outer surface of the respective wall 2. However, it is also conceivable that only individual sections of a wall 2 or only one of said walls 2 are provided with an insulating material 3. For example, it may well be sufficient to provide only the edge and / or corner regions of the walls 2 with an insulating material 3.

Finally, it is also necessary in some places that the insulating material 3 has one or more openings 4. This is the case, for example, in the region of the bottom wall 2b, in order to enable installation of the filter device mentioned. The same applies to the areas in which corresponding pipelines protrude into the interior 15 of the dishwasher 1 in order to guide the rinsing liquor in the direction of the spray arms. In this context, it should be mentioned that it can be just as advantageous to equip only the area around the openings 4 with an insulation, since here the highest vibrations usually occur and to leave the remaining areas of the bottom wall free of insulating material. Another possibility of targeted insulation is to provide some areas with two or more layers of insulating material 3. Thus, it would be conceivable, for example, first to equip the entire wall 2 with the first layer and subsequently selected areas, for example the edge area around the opening 4, with a further layer.

Furthermore, it should be noted at this point that the interior 15 may be surrounded in an embodiment of individual, subsequently assembled walls 2. It is also conceivable that, for example, the side walls 2a and the top wall 2c, or the side walls 2a and the back wall 2d are bent from a sheet material into the necessary U-shape, which subsequently with the back wall 2d and the bottom wall 2b and the top wall 2c and the bottom wall 2b is connected. In general, however, the bottom wall 2b is made as a separate wall and connected to the side walls 2a and the back wall 2d, which are either individually or already partially assembled or integrally formed. A last variant provides that initially a cylindrical sheet-metal part is bent in such a way that it forms a body with two side walls 2a, a bottom wall 2b and a back wall 2d. This body finally becomes provided with a top wall 2c, so that in this way finally the interior 15 of the dishwasher 1 surrounding body is formed, which has a bottom wall 2b, two side walls 2a, a back wall 2d and a top wall 2c.

The method according to the invention will now be explained in more detail below using the example of a bottom wall 2b, it being explicitly pointed out that the method also relates to the remaining walls 2 of a dishwasher 1, be it a single side wall 2a, a back wall 2d, a door wall or a body corresponding to a plurality of walls 2, as already described above, can be applied.

FIG. 2 shows first schematically a suitable for the inventive application of the insulating material 3 device. This has a support frame 8 for receiving the wall to be insulated 2, which either, as in the example shown, stationarily arranged, or else, for. B. along a production line, can be moved. The support frame 8 has a grid-shaped support structure 13, on which the wall 2 is later placed and despite its support function allows infrared radiation of the wall 2 according to the following description. Of course, instead of the support structure 13, other support elements may be used, so that FIG. 2 only to be understood as an example.

Furthermore, the device has a lower infrared radiator unit 5, referred to below as the first infrared radiator unit. This can, as in the embodiment shown, be movable relative to the support frame 8 (which is particularly suitable in the event that the support post 8 can also be moved along said production line). It would also be possible to position the infrared radiator unit 5 stationary below the support structure 13, if the support frame 8 is not movably mounted. Finally, it is also conceivable that the first infrared radiator unit 5 in addition to or instead of a direction parallel to the wall surface of the wall 2 extending direction in the vertical or oblique direction is movable. In this case, it would also be possible to irradiate wall sections designed in particular as a bottom wall 2b, which have the shape of a trough.

The insulation is attached to these trough-shaped walls 2 on the side facing away from the tub interior. If one now puts this wall 2 with the curvature up on the support frame 8 in order to hang the insulation material 3 from above, so the tub interior downwards. In order now to set the correct distance between the first infrared radiator unit 5 and the wall 2, it would be expedient to design and store the first infrared radiator unit 5 such that it can be moved into the interior of the tank from below. Of course, it is in the case of trough-shaped walls 2 advantageous if the support structure 13 is correspondingly arched upward, so that the movement of the first infrared radiator unit 5 is not hindered when approaching from below to the wall 2.

In addition, shows FIG. 2 a further, hereinafter referred to as the second infrared radiator unit infrared radiator unit 9, which is positioned above the support frame 8 and also movably mounted relative to this. In order to be able to move the two infrared radiator units 5, 9, these each have a schematically illustrated guide element 6 in the exemplary embodiment shown, via which they each communicate with one or more corresponding devices, for example a robot arm. Likewise, the device of course has corresponding cable connections and controls, the exact execution of the essence of the invention, however, are also not primary and are therefore not shown for reasons of clarity.

Finally shows FIG. 2 another element that is for the insulation of a wall 2 according to the invention of advantage, but would not necessarily be present. This is a forming die 10, which can be moved in the direction of the support frame 8 by means of a drive element 11, for example in the form of a hydraulic unit. A more detailed description follows in the course of the further description of the figures.

In order to provide an intended as a wall for a dishwasher 1 wall 2 in accordance with the invention with an insulating material 3, the wall 2 is first placed on the support frame 8, which can be done manually or by means of known robot ( FIG. 3 ). The wall 2 shows with its inside down, with its outside upwards.

Following this, also manually or with the aid of appropriate gripping devices, the actual insulating material 3 is placed on the outside of the wall 2, wherein this, as in FIG. 4 shown, for example in the form of a flat, preferably having bitumen, insulating mat may be present. The insulating material 3 can cover the entire surface of the outside of the wall 2, which later surrounds the interior 15 of the dishwasher 1, or only individual sections thereof. Likewise, it may be advantageous to save individual areas, as shown in the present embodiment. Thus, the in FIG. 4 shown insulating mat on an opening 4, with the opening 4 of the wall 2 (s. FIG. 3 ) and into which, for example, the upper filter of a filter device extends after the assembly of the dishwasher 1.

While according to the Figures 3 and 4 the wall 2 and the insulating material 3 are placed separately and successively on the support structure, it is of course also possible to occupy the wall 2 before laying with the insulating material 3 and finally spend both elements together in the area of the support structure.

The next step is now, as in FIG. 5 represented, the first infrared radiator unit 5 positioned below the support structure and the second infrared radiator unit 9 above the insulating material 3, wherein this can be done simultaneously or with a time delay. It would also be conceivable to place the first infrared radiator unit 5 already below the support structure and to operate it before the wall 2 or at least before the insulation material 3 is inserted into the device in order to already preheat the wall 2.

After placing the two infrared radiator units 5, 9, these are now turned on, so that the wall 2 on its side facing away from the insulating material facing away from the first, lower infrared radiator unit 5 and the insulating material 3 on the side facing away from the wall 2 primarily from the second , upper infrared radiator unit 9 are irradiated. While the first infrared radiator unit 5 is used for heating and subsequent fixing of the insulating material 3, the heat generated by the second Infrared radiator unit 9 primarily causes softening of the insulating material 3. In order to ensure the necessary temperature of the Dämmmaterials 3, which causes a softening, but not a melting, the second infrared radiator unit 9 is preferably placed at a distance of a few centimeters above the insulating material 3. Likewise, of course, a greater distance is possible, in which case the heating power of the second infrared radiator unit 9 or the heating time, which is only a few seconds in the example shown, would have to be increased.

After expiration of a predetermined beam duration, the second infrared radiator unit 9 is removed again ( FIG. 6 ), wherein the first infrared radiator unit 5 continues to operate or at the latest is put into operation at this time to heat the wall 2 from below. Finally, immediately after removal of the second infrared radiator unit 9, the forming die 10 is moved downwards in order to press or press the softened insulating material 3 against the heated wall 2, which in turn is supported downward by the support structure 13 of the support frame 8.

Alternatively, it is of course also possible to dispense with the use of the forming die 10. In this case, depending on the insulating material 3 used, it may be necessary to operate the second infrared radiator unit 9 at an increased power in order to raise the insulating material 3 to a higher temperature (when bitumen mats are used as the insulating material 3, for example at a temperature between 120.degree and 130 ° C). In this way it is finally ensured that it comes to the necessary for the adaptation of the insulating material 3 softening thereof, resulting in a most complete nestling of the insulating material 3 to the contour of the wall 2. Finally, it is also possible, the first infrared radiator unit 5 and to operate the second infrared radiator unit 9 at the same time (eg for a period of between 7 and 12 seconds).

In the course of either now the insulating material 3 itself or applied to the insulating material 3 adhesive layer 7, which is now between insulating material 3 and 2 wall, activated by the radiant heat from below such that a fixation of the insulating material 3 to the wall of the second he follows. While insulation materials 3, for example certain plastics or even natural materials, can be used which already have an adhesive property due to the occurring heat, an additional adhesive layer 7 will usually be preferred, since these are particularly easy to meet the corresponding requirements (adhesive force, resistance , Activation temperature, health safety, etc.) can be adjusted.

Such adhesive layers 7, for example polyurethane adhesive layers, during their activation usually undergo a chemical and / or physical change in their structure which, even after assembly of the dishwasher 1, can be characteristic of infrared radiation and activation of the adhesive layer 7.

After the necessary time for the activation of the adhesive layer 7, which is usually less than a minute, the forming die 10 is finally raised again (see FIG. 7 ), so that the finished, now insulated with an insulating material 3 wall 2 can be removed from the system. This can be done either by the wall 2 is removed from the support frame 8 or that the support frame 8 is moved to another mounting position of the production line.

Of course, the forming die 10 can also be removed earlier and thus before switching off the first infrared radiator unit 5, as soon as the insulating material 3 the desired shape, usually the shape or contour of the opposite side to be provided with the insulation material 3 wall. 2 corresponds, received. If insulating materials 3 are used that have sufficient heat storage capacity (such as bitumen, for example), part of the heat energy necessary for activating or hardening an existing adhesive layer 7 can still be present even after the infrared radiator units 5, 9 have been switched off come from the insulating material 3 itself. This acts in this case as a heat storage, which gradually releases the heat to the adhesive layer 7.

Finally, with reference to FIG. 8 referred to another key advantage of the invention. While conventional insulation materials according to the prior art are usually fixed by the wall 2, that heat through the Insulating material is passed through to the adhesive layer 7, allows the inventive irradiation of the insulation material 3 side facing away from the wall 2 targeted heat input into the disposed between wall 2 and insulation material 3 adhesive layer 7. Thus, the height of the insulating material 3 plays in the activation of the adhesive layer 7 no decisive role, since the heat input is not done by the insulating material 3, but by the usually very thin wall 2 of the washing. Therefore, with the aid of the method according to the invention, it is possible to fix particularly thick insulating material layers or a plurality of insulating material layers arranged one above the other, which are connected correspondingly, to the wall 2. Likewise, as in FIG. 8 shown, between the adhesive layer 7 and insulating material 3, a further insulating layer 12 made of a material which differs from the actual insulating material 3, be arranged. This insulation layer 12 may be distinguished, for example, by special sound and / or heat insulation properties. Furthermore, the insulation layer 12 may have vibration-damping properties, so that the insulation can be further improved.

• ein Roboter legt das Dämmmaterial 3 (Bitumenmatte) auf die Bodenwandung 2b einer Geschirrspülmaschine 1 auf,
• Infrarotstrahlereinheiten 5, 9 fahren oben über die Dämmmatte und unten dicht unter die Bodenwandung 2b (Abstand: ca. 10 bis 20 mm),
• obere Infrarotstrahlereinheit 9 strahlt ca. 3 Sekunden, so dass die Bitumenmatte zum Konturenprägen relativ weich wird (Temperaturbereich für Bitumen: ca. 50 bis 60 °C),
• die obere Infrarotstrahlereinheit 9 fährt weg, ein Formstempel 10 drückt die Bitumenmatte an die Bodenkontur (der Formstempel 10 wird vorzugsweise aus einem Polyacetal gefertigt, das nicht am Bitumen anklebt),
• der Formstempel 10 fährt hoch,
• die untere, innere Infrarotstrahlereinheit 5 beginnt ca. eine Sekunde nach dem Start der oberen Infrarotstrahlereinheit 9 mit der Erwärmung der Bodenwandung 2b, so dass der Formstempel 10 das Bitumen auf die erwärmte Bodenwandung 2b drückt,
• dann strahlt die untere Infrarotstrahlereinheit 5 für ca. 8 bis 10 Sekunden, so dass der Kleber ausgeheizt wird und sauber polymerisiert.

A last advantageous embodiment provides in particular the following method steps and method parameters:

• a robot places the insulating material 3 (bitumen mat) on the bottom wall 2b of a dishwasher 1,
• Infrared radiator units 5, 9 drive above the insulating mat and below tightly below the bottom wall 2b (distance: approx. 10 to 20 mm),
• Upper infrared radiator unit 9 radiates for approx. 3 seconds, so that the bitumen mat becomes relatively soft for contour embossing (temperature range for bitumen: approx. 50 to 60 ° C),
• the upper infrared radiator unit 9 moves away, a forming die 10 presses the bitumen mat to the bottom contour (the forming die 10 is preferably made of a polyacetal which does not stick to the bitumen),
• the forming punch 10 moves up,
• the lower, inner infrared radiator unit 5 starts about one second after the start of the upper infrared radiator unit 9 with the heating of the bottom wall 2b, so that the forming die 10 presses the bitumen onto the heated bottom wall 2b,
• then the lower infrared radiator unit 5 radiates for about 8 to 10 seconds, so that the adhesive is baked and polymerized clean.

The inventive method finally energy and footprint savings are achieved, which are on the order of more than 60% over conventional furnaces. Likewise, the maintenance and service costs can be significantly reduced.

Incidentally, the invention is not limited to the illustrated embodiments. Rather, all combinations of the individual features described, as shown or described in the claims, the description and the figures and as far as a corresponding combination is technically possible or seems reasonable, the subject of the invention.

In the context of the invention, an infrared radiator unit generally comprises one or more heat radiation sources with the aid of which heat rays can be focused or focused on a desired heat treatment zone of the respective wall, while the areas outside the heat treatment zone have little or no heat radiation from the heat treatment zone hit or not reached. As a result, only the respectively locally bounded for the bonding of the insulating material heat treatment area of the wall is heated, while the remaining areas of the wall are heated only slightly or not. This targeted heat energy input can save considerable energy compared to the case that the entire washing, in particular the entire wall is heated by hot air in a hot air oven. In particular, a targeted, localized heat energy input into the respectively desired treatment zone or treatment surface of the respective wall in a shorter time period than when heating the entire wall or the entire washing container in a hot air oven is made possible by the infrared structural unit. Those areas of the wall in which no insulating material or no bonding of the insulating material is provided, are heated less or not at all. By virtue of the fact that only the respective desired treatment zone or area is specifically exposed to heat radiation by means of the infrared radiator unit, it is possible to apply only the layer required for the bonding, in particular the underside contact layer of the Heat insulation material, which is associated with a significant energy savings and manufacturing time or treatment time savings. In particular, the fact that the heat input by means of the infrared radiator unit is made from that side of the respective wall of the washing container, which faces the contact surface of the wall for the insulating material, ie facing away from this, can ensure that the insulating material primarily only from its lower-side contact layer is warmed up in the respective desired heat treatment zone. This brings a significant energy saving and time savings in bonding the insulation material with it. For a complete thorough heating of the insulating material from the opposite side of its contact surface is therefore no longer required.

LIST OF REFERENCE NUMBERS

1

dishwasher

2

wall

2a

sidewall

2 B

bottom wall

2c

top wall

2d

Rückenwandung

3

insulation

4

perforation

5

Infrared radiator unit

6

guide element

7

adhesive layer

8th

supporting frame

9

second infrared radiator unit

10

forming punch

11

driving element

12

insulation layer

13

support structure

14

corpus

15

inner space

Claims (16)

Method for applying a, preferably flat, insulating material (3), in particular a bituminous mat, to at least one wall (2) provided as an interior boundary of a dishwasher (1), in particular a domestic dishwasher, characterized in that the insulating material (3), preferably with the aid of a robot, brought into contact with the respective wall (2) and then fixed by means of at least one first infrared radiator unit (5) on the wall (2). Method according to one or more of the preceding claims, characterized in that the insulating material (3) is fixed to the wall (2), that during the irradiation on the insulating material (3) arranged and heat-activatable adhesive layer (7) by means of the first infrared radiator unit (5) generated heat is activated. Method according to one or more of the preceding claims, characterized in that the first infrared radiator unit (5) for fixing the insulating material (3), in particular from a distance of less than 30 mm, preferably from a distance of less than 20 mm, on the Insulating material (3) opposite side of the wall (2) radiates. Method according to one or more of the preceding claims, characterized in that , after the insulating material (3) with the wall (2) was brought into contact and before the insulating material (3) is fixed to the wall (2), at least a second infrared radiator unit (9) on the side facing away from the wall (2) of the insulating material (3) radiates to the insulating material (3), in particular to a temperature between 40 ° C and 70 ° C, preferably to a temperature between 50 ° C and 60 ° C, to warm and soften it. Method according to one or more of the preceding claims, characterized in that the insulating material (3), in particular after irradiation with the aid of the second infrared radiator unit (9), by means of a, against the wall (2) movable forming punch (10) against the wall (2) is pressed. Method according to one or more of the preceding claims, characterized in that the first infrared radiator unit (5) is operated before the insulating material (3) by means of the forming punch (10) against the wall (2) is pressed, in particular before the insulating material (3 ) is brought into contact with the wall (2). Method according to one or more of claims 1 to 3, characterized in that , after the insulating material (3) with the wall (2) was brought into contact and before the insulating material (3) is fixed to the wall (2), at least one second infrared radiator unit (9) on the side facing away from the wall (2) of the insulating material (3) radiates to the insulating material (3) to a temperature between 100 ° C and 150 ° C, preferably to a temperature between 120 ° C and 130 ° C, to warm and soften it. Method according to one or more of the preceding claims, characterized in that in the direction of the wall (2) directed first infrared radiator unit (5) and the second, in the direction of the insulating material (3) directed infrared radiator unit (9) begin simultaneously with the irradiation. Method according to one or more of the preceding claims, characterized in that the method comprises the following steps: - attachment or placement of the insulating material (3) on or on the wall to be insulated (2), - Aligning the wall (2) and / or the first infrared radiator unit (5), so that the first infrared radiator unit (5) is directed to the wall (2) and positioning a second infrared radiator unit (9) such that the second infrared radiator unit (9) is directed onto the insulating material (3), Operation of the second infrared radiator unit (9), in particular for less than 10 seconds, preferably for less than 5 seconds, in order to soften the insulating material (3), Operation of the first infrared radiator unit (5) directed towards the wall (2) in order to heat the wall (2), Removing the second infrared radiator unit (9), - Pressing the insulating material (3) to the wall (2) by means of a in the direction of the insulating material (3) movable mold punch (10), - Operation of the first infrared radiator unit (5), in particular for less than 15 seconds, preferably for 8 to 10 seconds, to fix the insulating material (3) on the wall (2), in particular by a heat-activatable attached to the insulating material (3) Adhesive layer (7) is activated by the heat generated by means of the first infrared radiator unit (5). Method according to one or more of the preceding claims, characterized in that an insulating material (3) is used, whose at least one side has an insulation layer (12), in particular a sound insulation layer and / or thermal insulation layer, wherein the insulation layer (12) is preferably On its side facing away from the insulating material (3) has a heat-activatable adhesive layer (7), by means of which the insulating material (3) on the wall (2) is fixed. Dishwasher, in particular domestic dishwasher, with an interior (15) for receiving items to be cleaned and with several walls (2) delimiting the interior (15), for example in the form of a side wall (2a), a movably mounted door wall, a back wall (2d) , a bottom wall (2b) and / or a top wall (2c), characterized in that at least one of the walls (2) applied by a method according to one or more of the preceding claims, preferably flat, insulating material (3), for example in shape a bitumen mat, wherein the insulating material (3) on the interior (15) facing away from the side the wall (2) is arranged. Dishwasher according to the preceding claim, characterized in that the insulating material (3) on the wall (2) is fixed by means of an adhesive layer (7) between the wall (2) and the insulating material (3) is arranged. Dishwasher according to one or more of the preceding claims 11 and 12, characterized in that between the adhesive layer (7) and the insulating material (3) an insulating layer (12), in particular a sound insulation layer and / or thermal insulation layer, is arranged. Dishwasher, in particular domestic dishwasher, with an interior (15) for receiving items to be cleaned and with several walls (2) delimiting the interior (15), for example in the form of a side wall (2a), a movably mounted door wall, a back wall (2d) , a bottom wall (2b) and / or a top wall (2c), wherein at least one of the walls (2) on its side facing away from the interior (15) a preferably flat, insulating material (3), for example in the form of a bitumen mat, has, in particular according to at least one of the preceding claims, characterized in that the insulating material (3) or an adhesive layer (7) by means of which the insulating material (3) is fixed to the wall (2), at least a first and at least a second Region, wherein the first region has a higher adhesive force against the wall (2) than the second region. Dishwasher according to the preceding claim, characterized in that the first region in the region of at least one corner, an edge and / or an opening (4) of the wall (2) is arranged. Dishwasher according to one or more of the preceding claims 14 and 15, characterized in that the adhesive layer (7) in the first region with the higher adhesive force has a higher degree of polymerization than the adhesive layer (7) in the second region.

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