DE4311978C1 - Forming dimples in thin sheet - by winding sheet on shaped support and deforming by fluid pressure - Google Patents

Abstract

Thin sheet material is dimpled by winding it in several layers on spaced supports and sealing the ends of the layers. The layers are then subjected to external positive pressure and/or internal negative pressure. USE/ADVANTAGE - Used for reflectors for diffusing light or sound, structural applications for containers, sandwich reinforcement, support sheet for concrete structures and energy absorbers (claimed). The process can handle large sheets and is flexible enough for a wide range of materials and dimple sizes.

Description

The invention relates to a method for dent deformation thinner material webs and foils, where the material Sheets and foils supported at a distance and with underpressure or overpressure.

In order to save materials, in many cases range of engineering equipment needed high strength and shape despite thin walls possess stability. Because these pieces of equipment are common Components of process, energy and environment technical systems, the walls should be additional favorable flow and thermal properties have. Thin-walled, stable structures for weight and cost reasons also in lighting technology nik, in the packaging, in the design, in the interior design tion and in construction technology. Here, the Foils and thin walls in addition to the dimensional stability have good optical properties.

Numerous methods are known to thin walls due to deformation of the walls an increased stiffness to lend. As a well-known example, the Rolled beads called cans or barrels. After Part of this shaping process is that the Deformations of the walls are usually mechanical Paths by rolling or stamping or on hydrauli paths by pressing against an embossing mold come. On the one hand, this makes the wall thick changed, on the other hand the surface quality of the deformed wall opposite the originally smooth wall reduced. Only if the embossing shape is a smooth top  area, the production of which is usually very is complex, can be hydraulically smooth Surface of the deformed wall can be reached.

It is also a hydraulic from DE-OS 25 57 215 cal molding process known in which thin walls of tubes or cylindrical containers evenly ßige staggered dent structure obtained by the cylindrical walls on the inside by support rings or support spirals are supported and by means of external rem overpressure be deformed bulge-like. Because of this hydraulic molding process, which is virtually free from mechanical touches, one gets high high quality surface finish achieved. The even ver set buckling structure of the tube walls continues to cause an increase in the stiffness compared to the non shaped smooth wall as well as an improvement in warmth transition in the flow with heating or cooling media. However, this hydraulic buckling process has two consequences parts: First, this procedure remains on pipe or cylindrical container walls limited. Second is that depend on the geometric size of the individual buckling structures gig of the diameter of the tube or the zylindri container if the buckling structures have an even should have a square shape. The reason for that are the laws of the denting process. With the the above-mentioned process has not been possible until now for example with large, bulged walls small offset bulge structure.

The object of the present invention is a method with thin walls or foils any geometric dimensions as well as variable Sizes of the staggered dent structure generated and in different technologies can be applied nen.  

This problem is solved by the fact that a bulge Multi-layer material web on spaced support elements is wound - the winding at the end of the material web is connected to the underlying layer and the Windings from outside with overpressure and / or from the inside be pressurized with a vacuum.

The advantages achieved with the invention are special in that thin walls or foils are multilayered wound on the support spiral or the support rings and then by external overpressure or internal Vacuum formed. The size of the bumps results from the diameter of the support rings or the Support spiral and the axial distance of the support rings or the slope of the support spiral. The geometrical Dimensions of the bulged wall or film result from the number of windings of the wall or film.

According to the invention it is provided that an outer fle flexible, flexible sleeve hydraulically tight around the spaced support elements wound material web ge will give. So that the hydraulic external pressure If the multilayer winding bulges, this will End of the outermost winding layer with the one below Layer hermetically connected - e.g. B. by Ver or Über glue or solder, which after the dent process like that will be solved.

The depth of the bumps is the elastic beu len independently and depends essentially on the Size of the bumps and the radius of curvature of the widened cold spiral during the dent molding process. The However, the depth of the bumps can be increased further be that for a plastic deepening of the bumps the deformation temperature during the buckling in the elastic / plastic transition area is raised, e.g. B. by heating the pressure chamber or the pressure meter  diums or in metals by electrical current flow, for example the Joule heat.

The dent-profiled thin material webs or foils have a greatly increased stiffness compared to Peak load and point load. A beulpro filleted cylinder made of thin aluminum sheet is z. B. the Factor approx. 8 stiffer than a cylinder with smooth aluminum Sheet metal, from which a material and weight savings approx. 50%. This results in numbers rich industrial applications for mate Rial- and weight-saving lightweight construction. There continue the bulged foils despite several Bends maintain their uniform buckling structure they also in the field of formwork and packaging suitable. Dented thin walls or foils are for the sheathing of thermal insulation materials, e.g. B. glass wool, suitable, since the thermal insulation materials - without additional fastenings or brackets - with the Er Fix lifts of the buckling structures. This wrapping thermal insulation are very dimensionally stable and therefore saves material and has a good visual appearance Appearance. Due to the hydraulic buckling process, the Surface quality compared to the undeformed smooth wall is almost unaffected; this even applies to anodized, anodized, highly reflective surfaces of thin walls.

The essential feature of the invention is the lighting technology Applicability of the buckled material webs. A geometrically directed light reflection with diffuse Light is achieved when concave shells with convex Buckling structures are used. Concave shells with concave dent structures create a directional, punk source of light. Convex shells with convex Bulge structures create an almost all-round, diffuse Light scattering. Convex bowls with concave dent structure  doors create an almost all-round, selective Light scattering.

Another advantageous embodiment provides that dent structured material webs as dimensionally stable Sound reflectors are used, their geometric Dimensions in the area of the sound to be reflected wavelengths lie. For a uniform acoustic Sound distribution in music halls etc. is preferred convex shells used as sound reflectors. Bulge structured walls are suitable because of their high Dimensional rigidity as self-supporting, sound-technical elements ment. Since a ver equally large wall mass is required thin-walled, dent-structured shells if required Increase the mass with another material behind feeds.

In a further advantageous embodiment dented walls or shells used to acu to avoid or avoid static reverberation effects reduce that the sound at the dent structure diffuse is scattered. This will be comparatively deeper Bumps used, the geometric sizes of the Bumps correspond approximately to the sound wavelengths of the air. Areas of application are e.g. B. Noisy factory floor len or traffic halls where the sound is diffusely scattered and then absorbed in sound absorber elements.

Good sound and music technology radiators must speaking a little according to the sound engineering laws Have mass and high bending stiffness. Thin Wall plates, shells or hollow bodies with a buckling profile meet these conditions because their ratio of Mass for bending stiffness is large. Another acoustic property of z. B. dented Pipes or hollow cylinders is that as a result the increased flexural rigidity the acoustic basic tone  is increased if a bulged wall with a smooth wall with otherwise the same geometric dimensions measurements is compared. This results in playfully the following uses: a musical body with a dented structure Wall gets a larger one than the smooth wall geometric diameter and thus a larger re sonorous body when the bulged and smooth sound body should have the same basic tone. This includes also the so-called plate vibrators, the resonators represent and by spring force of a rear air pads absorb sound. On the other hand, in technology low-vibration pipes, cylinders or hollow body needed that is not in the lower frequency range are excited to vibrate. An example of this are chimneys that are stable on the one hand and on the other hand not too much vibration due to the wind should be stimulated to prevent destruction avoid. With bulged pipes, cylinders or hollow bodies, this risk is avoided or reduced because the lowest excitable oscillation frequency the smooth wall is raised.

Another embodiment according to the invention provides that dent structured material webs for dimensionally stable Multi-chamber containers are used, the inner Partition walls due to the circumferential buckling of the wall be fixed. In recycling technology, there are more Mercer containers used to separate glass, cans, paper etc. to collect. Are multi-chamber containers from bulge structured walls, there are two pre parts. Bulge-structured due to the great shape stability The thin walls of the containers save weight. Wei the inner partitions of the - as a rule cylindrical - multi-chamber container through which circulate fixed the buckling of the wall.  

According to the invention is also a sandwich construction tion of layered dented layers Walls or shells that further increase the rigidity increases. In order to keep the ge evenly spaced layered dent structured walls are alternating Dent structures with right and left twist used, the twist of the support spirals during the bulge gangs according to claim 1 is one or more days. The free flow cross sections between the beulprofi walls, possibly enlarged by spacers are used in energy technology or processes technical apparatus as flow channels for the Heat and mass transfer, whereby by flow steering on the buckling structures of the heat and fabric exchange compared to the smooth wall is improved. Because of the extremely smooth surfaces of the beulstruktu walls is the risk of settling down particles of material on the walls, so-called fouling, right induced. A simple and weight-saving construction for heating or cooling plates, if each two walls are connected to each other on the bulge side - e.g. B. by gluing or soldering. Bulge-profiled thin Walls that are glued to smooth thin walls result in dimensionally stable and optically good looking walls, the z. B. use as stand walls or in packaging can be detected. Perforated sandwich constructions th or slotted bulged walls that with Spacers are fixed, are suitable as ge weight-saving, sound-absorbing components. A case Game for this are car exhaust parts that work simultaneously an axial compensation capability with thermal off have strains. Another advantageous Ausge staltung of the invention results when spiral wound bulged walls pushed together be and separate flow channels of a spiral heat form transmitter. The structure corresponds to the Constructions known in the prior art; however be  are the spiral walls made of bulged walls that despite thin walls, a high level of dimensional stability, a low mechanical vibration excitation and one opposite the smooth spiral wall improved convective heat own transmission.

Similarly, spirals are widened cold-formed sheet metal for the production of rotie renden heat exchangers, after the regeneration principle z. B. the waste heat of a hot exhaust air stream Transfer heating of a cold fresh air stream becomes. The air flows in the axial direction the gap between the spiral sheets. As a result the staggered bulge structure results in an intense convective heat transfer, the pressure loss ver is equally low.

Another advantageous embodiment of the invention provides that dent-structured material webs that preferably have a rough surface for which Inflating shotcrete can be used. To Her provision of shotcrete constructions from shotcrete the usually complex support structures with reinforcements materials needed, which are then sprayed on be blasted. Dented walls and shells are suitable for blasting with shotcrete, because they are dimensionally stable and save work. So that Shotcrete on the dented wall a good one The dented wall receives liability a well-adhering surface roughness that the smooth Wall connected with a mesh or wire mesh becomes. The thin wall in front of the bulge is preferred connection to the mesh or wire mesh (e.g. by gluing or soldering) and then dent together forms.

Composite constructions represent another fiction appropriate measure. Are the gaps between the sand  wich constructions from bulged walls with Se filled with base materials, dimensionally stable Ver fret constructions. Especially with cylindrical or shell-shaped composite structures cause the rear overlaps of the dent structures have a good shape conclusion between the dented walls and the Secondary substances (fillers). The adhesive effect between the dented wall and the filler can be there be improved by that with a stitch or Wire mesh connected dented wall used becomes. Inferior Recyc Ling plastics are used. These fillers are either in liquid form in the gaps of dent structures or as rivers sig / solid mixture, e.g. B. heated plastic mixture, applied to the individual dented walls, before joining them into a composite structure be pressed. These fillers become more liquid Shape, preferably with a moving nozzle-shaped lance, into the spaces between the bulges presses. Alternatively, a liquid / solid mixture (e.g. plastic / solid mixture) on the individual bulge textured walls before being applied ner composite construction are pressed together.

This composite construction with enclosed biege We also have soft plastic kung, because with bending vibrations stretching and compression tion of the plastic occur, causing the Schwin energy is converted into thermal energy. With large The axial buckling folds bend when subjected to higher axial loads and become white against the deformation resistance ter squeezed. This results in a large one absorbed deformation energy of the profiled walls. That is why buckled pipes, spirals or sand wich packages well as spacers, shock absorbers and en suitable for energy absorption. The gaps between the  dented walls can additionally partially or completely with energy absorbing substances be filled.

Another advantageous embodiment of the invention sees the coloring of the buckling bumps or bulges in front. For the optical or lighting area advertising, interior design, etc., the honeycomb The dent structures are highlighted in terms of lighting technology be that textured walls from translucent thin walls that are on one side with a light reflecting layer are made and then the light reflecting coating removed in the area of the buckling bumps or depressions be, e.g. B. Etching. This will make the bulge profiled Wall in the area of the buckling bumps or the bulging depressions translucent. Application examples in the area of Advertisements are illuminated letters from bulged profiles Pipe pieces, with a light source inside at night the pipe pieces are scattered diffusely and through the translucent contours seems. Reflect during the day the illuminated letters illuminate daylight on the meadow outside of the dented walls. The honeycomb Buckling structures can be caused by different metho which are colored: transfer of in a fluid stream suspended color particles, with the coloring on the protruding surface elevations (buckling edges) is increased. This results in very fine color deviations gradations. This follows from the flow physics Laws of mass transfer. Also a vapor deposition in the Va vacuum is possible. A coarse coloring is done with tels ink rollers that over the surface elevations unrolled. A time-variable coloring can by using a thermal ink that Fall below a certain temperature envelope experienced, achieved. A different che temperature distribution along the dent structure  gives when z. B. the dented wall with electrical current (Joule heat) or is flowed around with a warm or cold medium. Here, the heat transfer affects the dent structure tur on the temperature distribution.

Another advantageous embodiment of the invention stipulates that in the manufacture of bottles, drinking vessels etc. is often the extrusion blow molding process, for example in plastics, or the blowing process ren, for example, applied to glass, the Material in plastic state due to internal pressure an outer mold wall is pressed. So very thin Bottles, drinking vessels etc. for weights and measures save a dimensionally stable wall like to use profiled mold walls. After the under the hydraulic process known as hydroform are metallic hollow bodies, for. B. pipes, by ver equally large internal pressures against an external shape pressed and plastically deformed. Continue to be in the mechanical compression z. B. plates through Pressed between two molded parts.

The production of the above-mentioned processes Forms is complex and expensive. An advantage adhesive production of profiled molded walls becomes after the invention by using bulged walls achieved using the following methods can:

• 1. Dented walls are on their outside backed with rigid materials - e.g. B. by pouring out metals that have a lower Have the melting point as the material of beulprofi wall. For good adhesion of the backing tert materials is, as already explained, one Surface roughness advantageous. Because when pouring with metal thermal expansion and thus deformation  the dented wall can occur Sandwich structures made of buckled textured walls the advantageous, the bulge structures ge support each other.
• 2. Dent-structured sheets or foils are ver uses the sand found in foundry technology To produce cores. The cores with the one shown Bulge structure are used to cast the bulge structure ten form.
• 3. Similar to the dented wall irradiated with shotcrete, the dent structured mold wall with a liquid material, for example metal, which froze on the dented wall. Here the heat of solidification, i.e. H. the negative Heat of fusion, dissipated by cooling the mold wall.
• 4. Be dent-structured mold walls for extremely large Press pressures of the blowing process are required stable shapes milled from high-strength metal blocks become. Bulge-structured models serve here advantageous for computer-controlled milling, the bulge-profiled model is electronically scanned.

Another advantageous embodiment of the invention stipulates that the maximum length of the producible bulged spiral winding by the number of Windings for the buckling process is limited. For larger is greater lengths of dented sheets or strips therefore a quasi "endless" production with a dent profile tapes desirable. According to the invention, a quasi "endless" production of buckled strips achieved by that sheets or foils over a Support cylinder, on the circumferential support rings or Support spirals are attached, pulled and then by printing an outer flexible pressure cuff  be dented. This process is semi-continuous pretty. When the pressure cuff is depressurized the tape moved on. Be at a standstill of the belt the buckling structures due to the pressure of the pressure cuff hydraulically imprinted.

According to the invention it is further provided that the Pressure cuff be a profiled surface that sits mechanically on the belt is pressed. Although this is now the case a mechanical - instead of hydraulic - shaping is not the usual procedure Equal compression molding. With the usual Compression molding processes are comparatively large forces required so that the material in the plasti state is pressed into the mold. In the process ren according to the invention is despite mechani chemical impression of a buckling process according to the mechani stability laws, which - before buckling deformation - A curvature of the band, support rings or support spirals len on the inside of the band as well as the dent structure tured surface of the pressure cuff. The dented surface of the pressure cuff preferably has the surface structure that is at he hydraulic denting process according to the invention gives.

Another advantageous embodiment of the invention sees a continuously working, mechanical Dent procedure. Instead of the pressure cuff with bump-profiled structure will circulate a flexible of the profile tape, which is on one side abge by closely arranged support rollers is supported and pimples offset on the other side, preferably made of hard rubber. The offset knobs are arranged so that they have the bulge of the bulge structure of the strip to be deformed.  

Further advantageous measures are in the remaining Un Described claims. The invention is based on egg Nes embodiment in the accompanying drawings shown and will be described in more detail below; it shows

Figure 1 shows the basic structure of an on device for producing beulprofilier ter material webs and / or films.

. Fig. 2a is a plan view of a with a device according to FIG 1 manufactured in, Beulstruktur;

FIG. 2b shows the top view of a developed bulge structure of a multi-start support spiral produced with a device according to FIG. 1;

FIG. 2c shows the top view of a developed bulge structure using a device according to FIG. 1, using support rings; FIG.

Fig. 3a, 3b, 3c and 3d, the schematic Dar position of different types of shell and bulge structures for light reflection;

Fig. 4 is a schematic cross section through a multi-chamber container;

Figure 5 is a schematic cross-section through a heating or cooling plate.

Figure 6 is a schematic view of a double-walled cylinder made of beulstruktu, with a device according to Figure 1 manufactured webs of material.

Fig. 7 shows the basic structure of egg ner form with a bulged surface for the manufacture of Ge vessels after the extrusion blow molding in cross section;

Fig. 8 shows schematically the structure of a device for the production of dent structured material webs by the semi-continuous dent process;

Fig. 9 shows schematically in a plan the knobs and the structure of a beulpro filiertes band;

Fig. 10 shows schematically the structure of an apparatus for the production of structured beul material webs by the continuous Beulverfahren.

The device shown in FIG. 1 shows the basic structure of the device for the production of bulged walls or foils. The film 1 is wound in a spiral on a support spiral 2 , which is firmly fixed on egg nem cylinder jacket 3 . The pressure cylinder 4 encloses the parts 1 to 3 mentioned . The two end covers 5 close the pressure cylinder 4 on both sides, the wrapping film 1 being sealed on both sides by the elastic cord rings 6 . The end of the outermost layer of the wrapping film 1 is tightly connected to the following layer. Alternatively, a rubber sleeve 7 is used for the hydraulic sealing of the winding 1 , in particular if perforated or slotted sheets or foils or mesh grids are to be deformed. By exchanging the clamping rings 8 , which have different diameters, different thicknesses of the winding 1 can be bulged. The bulging process takes place by means of overpressure of the medium which flows in through the opening 9 . If a plastic film is deformed, the Druckap parature is heated to the temperature of the elastic-plastic transition area of the plastic. If even higher temperatures are required for an elastic / plastic denting process (deep dents for metals; thin ones for glass walls), the round cord rings 6 are replaced by temperature-resistant sealing packings.

The device shown in Fig. 2a shows the bulge structure in the supervision of a developed Fo lienabschnittes. The distance h of the buckling structures corresponds to the distance h of the support spiral 2 in FIG. 1 if the support spiral is catchy. The circumferential buckling bends 10 correspond to the lines of support spiral. The axial buckling bends 11 and thus the width b are independent. The number of buckling structures can be calculated using an empirical formula. In Fig. 2b the developed bulge structure of a multi-start support spiral is Darge. As a result, the angle of inclination in FIG. 2b is greater than the angle of inclination in FIG. 2a.

In Fig. 2c, the bulge structure of a unwound film is shown, which was shown with an apparatus analogous to Fig. 1, wherein equidistant support rings were used instead of the support spiral 2 . The angle of inclination becomes zero.

Dent-profiled sheets or foils with different Chen angles of inclination are also for decorative building technology African elements, e.g. B. building facades or roofs (in Connection with thermal insulation).

Become buckled profiled sheets or foils for covering development of pipes or cylindrical containers (e.g. for the thermal insulation) used are preferred following types of sheathing for a uniform Arrangement of the dent structures:

• 1. Spiral wrapping with the foils ( Fig. 2a or 2b). It follows from the geometrical conditions that this type of winding is only suitable for relatively large pipe or cylinder diameter, because the inclination angle in Fig. 2a and 2b are small..
• 2. For medium or small pipe or cylinder diameters, a spiral winding of foils ( Fig. 2a or Fig. 2b) is suitable, the spiral-shaped sheathing with the bulge-shaped foil being carried out because the foils buckle perpendicular to the bulge 10 is bent.
• 3. Radial wrapping of the tubes or the cylindrical container with foils according to Fig. 2c. This corresponds to a section-wrap with the length L.

The device shown in FIG. 3 shows schematically the different types of shell and bulge structures for light reflection (L = light source):

• a. A concave shell with convex dent structures creates a geometrically directed light reflection diffuse light scattering.
• b. A concave shell with convex dent structures creates a geometrically directed light reflection selective light scattering.  
• c. A convex shell with convex dent structures creates almost all-round, diffuse light scattering.
• d. A convex shell with concave dent structures creates an almost all-round, selective light scatter ung.

The device shown in Fig. 4 shows cal matically a cylindrical multi-chamber container. The bulged cylindrical wall 12 has its own distance h of the circumferential buckling bends ( 10 in Fig. 2c), where h corresponds to the distance of the partitions 14 to each other. Due to the circumferential buckling of the wall, the partitions 13 are fixed locally, which are still glued if necessary. The spherical caps 14 laterally close off the multi-chamber container. This creates dimensionally stable, weight-saving Mehrkammerbehäl ter, the z. B. in the case of dumpsters still fill slots and closable emptying openings zen zen, which are not shown in Fig. 4.

The device shown in FIG. 5 shows a heating or cooling plate schematically. Two bulged plates 15 and 16 are placed on the bulge side against each other and glued or soldered. The heating or cooling medium flows in the intermediate space.

The device shown in Fig. 6 shows a double-walled cylindrical container, for. B. for the storage of liquid hazardous substances. Here, the inner jacket 17 consists of a bulged cylinder, on which the outer bulged cylinder 18 is ge wrapped or put. For the purpose of mutual support of the bulge walls of 17 and 18 , the bulge structures are preferably used with different twist and different angle of inclination ( FIG. 2). The spherical caps 19 and 20 are glued or welded to the buckling cylinders 17 and 18 . The annular space 21 serves to hold a test liquid or a heating or cooling medium. Filling, emptying and control openings are not shown in the schematic drawing of FIG. 6.

The device shown in Fig. 7 shows the basic structure of a mold with a beulprofi-lined surface for the manufacture of vessels by the extrusion blow molding process. A bulged zy-cylindrical wall 22 with a bottom 23 is back-poured in a zy-cylindrical container 24 with low-boiling liquid metal 25 in the annular space, which contains the cooling coil 26 . For better adhesion of the solidifying metal melt on the bulged wall, the bulged wall has a surface roughness on the outside. The cooling coil 26 is used for cooling the mold during the thermal blowing process.

Fig. 8 shows schematically the semi-continuous dent process. The band 27 is pulled over the guide rollers 28 over the cylinder 29 , on which rotating support rings 30 are attached. By means of a flexible pressure sleeve 31 , which is supported by an outer holding device 32 , an overpressure is hydraulically transmitted to the belt 27 , whereby the bulging process takes place. Then the Druckman cuff is relieved of pressure and the tape is moved so far by rotating the cylinder 29 that only a small part of the already bulged tape is under the pressure cuff 31 . The further buckling deformation of the strip then proceeds from this buckled part. If necessary, the pressure cuff 31 receives different pressure ranges so that the pressure from the end 31 b towards the start 31 a of the pressure cuff is built up. This can be done by separate pressure sections in the pressure sleeve. Alternatively, the Drucklei device at the point 31 b of the pressure sleeve is ruled out, so that the pressure builds up, possibly via additional flow resistances in the pressure sleeve from the rear ( 31 b) to the front ( 31 a). These measures are used so that in the semi-continuous dent process there is a uniform dent profile along the belt 27 . The bulged strip is wound onto the roll 33 .

A feature essential to the invention is that the pressure sleeve 31 has a bulged surface which corresponds to the spacing of the support rings 30 . The surface of the pressure cuff does not necessarily have to contain the complete dent shape. It is sufficient that the surface of the profiled Druckman cuff from offset knobs 34 , z. B. made of hard rubber, which correspond in shape to the bulges. Fig. 9 schematically shows in a plan view, the knobs 34 and the structure of the belt 35 beulprofilierten. The buckling pleats 36 correspond to the lines of the support rings 30 in FIG. 8.

Fig. 10 shows schematically the continuous dent process. The belt 27 is continuously guided over the guide rollers 28 over the cylinder 29 on which the support rings 30 are attached. The circumferential profiled belt 37 is guided over five guide rollers 38 and passed via the cylinder 29 including belt 27 . By means of support rollers 39 , the circumferential profiled band 37 , which preferably consists of fiber-reinforced material, is pressed onto the band 27 , as a result of which the buckling deformation begins. The deformation pressure is adjustable by the support rollers 39 . The dented tape is wound on the roll 33 .

Claims (26)

1. A method for buckling thin material webs and films, in which the material webs and films are supported spaced apart and subjected to a negative or positive pressure, characterized in that a material web to be bulged is wound several times on spaced support elements, the winding at the end the material web is connected to the underlying layer and the windings are acted upon from the outside with positive pressure and / or from the inside with a negative pressure. 2. The method according to claim 1, characterized in that that an outer flexible, pliable shell hydrau lisch tight around the on spaced support elements wound material web is given. 3. The method according to claim 1, characterized in that dent-profiled material webs with concave Shape a geometrically directed, especially one cause punctiform light scattering.   4. The method according to claim 1, characterized in that dent-profiled material webs with convex Form a geometrically distributed, diffuse Cause light scattering. 5. The method according to claim 1, characterized in that dent structured material webs as form stable sound reflectors are used, the geometric dimensions in the area of the reflec sound sound wavelengths. 6. The method according to claim 1 and 4, characterized records that 'perforated for diffuse sound scattering or slotted, dent-structured material webs or mesh grille to cover sound absorbers over materials are used. 7. The method according to claim 1, 4 and 6, characterized shows that the depths of the buckling structures in Ab dependence on the required diffuse sound scatter can be varied. 8. The method according to claim 1, characterized in that thin-walled buckling walls with low mass and high flexural strength as sound or music technology spotlights, as plate vibrators or in the deep Frequency range as low-vibration pipes, cylinders and hollow body can be used. 9. The method according to claim 1, characterized in that dent structured material webs for formsta bile multi-chamber containers are used, the inner partitions due to the all-round buckling fixed to the wall.   10. The method according to claim 1, characterized in that sandwich constructions made from one another layered, dent-structured and necessary if smooth walls or spirals are used the. 11. The method according to claims 1 and 10, characterized ge indicates that the sandwich constructions are a high dimensional stability, a ge at low frequencies rings vibration excitation and an axial compensation ability to function. 12. The method according to claims 1, 10 and 11, characterized characterized that spirals with alternating Right and left spin of single or multi-course Dent structure can be used. 13. The method according to claim 1, characterized in that that dent structured material webs, the preferred wise have a rough surface for the on blowing shotcrete can be used. 14. The method according to claim 1, 10, 11 and 12, characterized characterized in that for the production of composite con structures one on top of the other, beulprofi gated material webs with embedded secondary substances, especially recycled plastics, ver be applied. 15. The method according to claim 1 and 14, characterized records that the composite structures sound absorbing, sound reflecting and have strength-increasing properties.   16. The method according to claims 1, 10, 11, 12, 14 and 15, characterized in that one or more usual dent-profiled material webs, preferred bulged pipes and spirals, as a spacer ter, shock absorber or energy absorber used become. 17. The method according to claim 1, characterized in that the areas of buckling or bulges ge are colored, preferably by flow physics dye transition, by vapor deposition, by means of Ink rollers or by means of thermal ink. 18. The method according to claims 1 and 17, characterized ge indicates that the dent-structured material web preferably with electric current or with warm or around cold media. 19. The method according to claims 1 and 10 to 13, there characterized in that dent structured material albahnen on one side with dimensionally stable materia be cast or blown back. 20. The method according to claims 1 and 19, characterized characterized that models for molded parts for Ex Trusionblasen be made of plastics. 21. The method according to claims 1 and 19, characterized characterized that models for molded parts to Bla glass. 22. The method according to claims 1 and 19, characterized ge indicates models for molded parts for casting rei core production.   23. The method according to claims 1, 19 to 22, characterized characterized that the models by means of computer supported molding processes. 24. The method according to claim 1, characterized in that in a semi-continuous dent process Fo lien or flexible material webs via a cylinder the one on which circumferential support rings or support spirals len are attached, pulled and by means of external outer smooth flexible pressure cuffs bulge be shaped. 25. The method according to claims 1 and 24, characterized ge indicates that in a semi-continuous Buckling method foils or flexible walls over one Cylinder, on the circumferential support rings or support spirals are attached, pulled and with by means of an outer pressure cuff, which a professional has a lined surface, be deformed. 26. The method according to claims 1, 24 and 25, characterized characterized in that in a continuous me chanic buckling foils or flexible walls over a cylinder, on the circumferential support rings or support spirals are attached and by means of a circumferential flexible band that the Contains contours of a staggered dent structure be deformed mechanically.