EP2177702B1 - Hollow profile, in particular separator tube for insulation glazing and device and method for producing same - Google Patents

Description

The present invention relates to a spacer tube in the form of a thin-walled, tubular hollow profile for the production of spacer frames of insulating glazing, and a method and an apparatus for its production.

A conventional insulating glazing has at least two parallel and spaced-apart glass panes, between which a space between the panes of defined width is provided. In order to permanently ensure this predefined space between panes, a circumferential spacer frame is provided between the two glass panes, which connects the two glass panes in the region of their outer edges of the pane. The spacer frame consists of a thin-walled spacer tube with a substantially flat rectangular cross-section, which has been bent to form the spacer frame accordingly, or of a plurality of individual spacer tubes, which are set by means of corner joints together.

Such spacer tubes are, for example, hollow profiles made of aluminum, which are produced, for example, by roll bending from an aluminum strip and subsequent welding of the abutting longitudinal edges of the aluminum strip. These spacer tubes have a wall thickness of 0.3-0.6 mm. A disadvantage of the spacer tubes made of aluminum, however, is that due to the good thermal conductivity of aluminum, the area of the outer edges of the pane or the edge area of the pane strongly cools at low outside temperatures. As a result, valuable heating energy is lost. If the temperature in this area also drops below the dew point, condensate forms, which can damage the frame construction, especially in the case of wooden windows.

In order to reduce these effects, since the mid-1990s and in particular in the course of the Energy Saving Ordinance (EnEV), which came into force in 2002, more and more spacer tubes made of materials are used, which have a significantly lower thermal conductivity. In this context, the term "warm edge" was coined. This term is used for the field of insulating glazing in which the outer edges of the discs are interconnected by the spacer tubes, the spacer tubes being made of a material of low thermal conductivity.

For example, such spacer tubes made of stainless steel and have a wall thickness of 0.15 to 0.2 mm. These stainless steel spacer tubes are also made by roll bending from a stainless steel strip and then welding the abutting longitudinal edges of the strip. The spacer tubes made of stainless steel are characterized by the fact that they are easy to process further, in particular by machine. The spacer tubes can be easily cut to the correct length and bent to the spacer frame. However, the material costs of stainless steel have increased enormously, especially in recent years.

Furthermore, there are spacer tubes made of plastic, which are produced by extrusion. Spacer tubes made of polymeric materials with low thermal conductivity have a lower heat transfer coefficient compared to spacer tubes made of stainless steel and are cheaper to produce. However, further processing, especially bending to the spacer frames, is difficult. Furthermore, plastic is not UV-resistant, tends to age and is not completely diffusion-tight. For this reason, it is known the backs of the spacer tubes cover with a metallic foil. The foil acts as a diffusion barrier. The other disadvantages of the spacer tubes made of plastic mentioned but are not resolved.

The WO / 03/074831 A1 discloses a spacer in the form of a hollow profile for insulating glass elements with two parallel spaced, abutting the discs side walls and two extending between the side walls, extending substantially transversely to the side walls legs. The hollow profile is constructed of a deformation-stable metal sheet and has at least in the region of the outer surface of the side walls on the metal sheet arranged thermal Isolierstoffauflagen. The Isolierstoffauflagen consist of plastic material and extend around the entire outer surface of the spacer tube. Furthermore, it is also possible for an insulating material pad to be provided in the interior of the hollow profile, which extends over the entire inner surface of the cavity in the spacer.

The DE 196 02 455 A1 discloses an inner strip for a gas-filled Mehrscheibenisolierverglasung with a profile body made of plastic and a gas-tight, metallic barrier layer on the coming into contact with the gas filling of the insulating glazing surface of the profile body. The metallic barrier layer is applied by vapor deposition under vacuum on the respective surface of the profile body.

From the EP 1 394 456 A1 A pipe for pipelines is apparent which consists of a metallic outer pipe with a Auskleidunci plastic and comprises all the features of the preamble of independent claim 1.

The US 5,466,534 B discloses a spacer tube for insulating glazings having a wall of metal having an outer coating of a polymer.

Object of the present invention is thus to provide a spacer tube in the form of a tubular, thin-walled hollow profile for the production of spacer frame of a double glazing, with low Heat transfer value, which is easy and inexpensive to produce and easy to process further.

In addition, it is an object of the invention to provide an insulating glazing, which has a spacer frame of one or more such spacer tubes.

Another object of the invention is to provide a device and a manufacturing method for simple and inexpensive production of such a spacer tube.

These objects are achieved by the features of claims 1, 8, 9 and 13. Advantageous developments of the invention are characterized in the respective subsequent subclaims.

Figur 1:

Eine perspektivische Querschnittsansicht des erfindungsgemäßen Abstandhalterrohres in Form eines Hohlprofils

Figur 2:

Das erfindungsgemäße Abstandhalterrohr gemäß Figur 1 im Querschnitt

Figur 3:

Einen Querschnitt eines Profilwandungsstreifens aus einem mit einem Kunststoffstreifen beschichteten Metallstreifen mit in den Kunststoffstreifen eingebrachten Längssicken vor der Rollverformung zum erfindungsgemäßen Abstandhalterrohr

Figur 4:

Eine geschnittene Seitenansicht einer Klebstoffauftragseinrichtung einer Klebeeinrichtung der erfindungsgemäßen Vorrichtung

Figur 5:

Eine Seitenansicht einer Schweißeinrichtung der erfindungsgemäßen Vorrichtung

In the following the invention will be explained in more detail by way of example with reference to a drawing. Show it:

FIG. 1:

A perspective cross-sectional view of the spacer tube according to the invention in the form of a hollow profile

FIG. 2:

The spacer tube according to the invention FIG. 1 in cross section

FIG. 3:

A cross-section of a profile wall strip made of a metal strip coated with a plastic strip with longitudinal beads introduced into the plastic strip before the roll deformation to the spacer tube according to the invention

FIG. 4:

A sectional side view of an adhesive applicator of an adhesive device of the device according to the invention

FIG. 5:

A side view of a welding device of the device according to the invention

The spacer tube 14 according to the invention in the form of a thin-walled tubular hollow profile 1 (FIG. Fig.1 . 2 ) has a profile wall 2 with a profile outer surface 3 and a profile inner surface 4, wherein the profile inner surface 4 encloses or defines a profile interior 5. According to the invention, the spacer tube 14 is also designed double-walled, that is, the profile wall 2 consists of an outer wall 6 and an inner wall 7, which are fixed or immovable, connected. The outer wall 6 consists of metal, in particular stainless steel or aluminum, and the inner wall 7 is made of plastic. Furthermore, the outer wall 6 according to the invention has a wall thickness of 0.04 to 0.1 mm, preferably 0.05 to 0.08 mm. The inner wall 7 according to the invention has a wall thickness of 0.15 to 0.5 mm, preferably 0.3 mm. In addition, the hollow profile 1 has a longitudinal extent in the direction of a profile longitudinal axis 8.

The material of the inner wall 7 is preferably a rotting or composable plastic, which expediently consists of renewable raw material. Furthermore, the plastic is expediently adapted to be treated with ultrasound, in particular by means of ultrasound or notched and notched and injection-molded and extruded. In particular, the plastic biopolymers, preferably Polyhydroxialkanoate and / or polycaprolactone and / or polyester and / or lignin, and / or lignocellulose and / or natural resins and / or natural fatty acids and / or natural waxes or consists of these substances. The melting point of the plastic is suitably at 100-170 ° C, preferably 120-150 ° C. Furthermore, the plastic preferably has the following material properties (alternative or cumulative). standard prefers Tensile strength _σ M [MPa] DIN EN ISO 527-1: 1996-04 40 to 60 45 to 55 Elongation ε _M [%] DIN EN ISO 527-1: 1996-04 2 to 2,8 2.3 to 2.5 Breaking stress σ _B [MPa] DIN EN ISO 527-1: 1996-04 20 to 30 23 to 27 Elongation at break ε _M [%] DIN EN ISO 527-1: 1996-04 7 to 10 9 to 9.8 Tensile modulus E [MPa] DIN EN ISO 527-1: 1996-04 2600 to 2800 2720 to 2780 Impact strength (23 ° C) acs [kJm ² ] EN ISO 179-1-: 2006-05 50 to 65 55 to 60 Melt index (190 ° C / 2.16 kg) [g / 1min] DIN ISO 1133: 2005-09 3 to 5 4 to 4.5 Density [g / cm ³ ] 1 to 1.3 1.2 to 1.25

The spacer tube 14 according to the invention is produced by roll deformation from a double-layered profile wall strip 29 (FIG. Fig. 3 ), which has a coated with a plastic strip 9 metal strip 10, in particular a stainless steel strip or aluminum strip, which will be discussed in more detail below. As a result, the spacer tube 14 has a longitudinal weld seam 11 extending parallel to the profile longitudinal axis 8. By means of the longitudinal weld seam 11, the regions of two longitudinal edges 12 of the metal strip 10 adjoining one another after the roll bending are welded together. In particular, the outer wall 6 is bent in the region of the two longitudinal edges 12 in the profile interior 5, so that two flange 13 are formed, wherein the two flange 13 are adjacent to each other and connected by means of the longitudinal weld 11. The longitudinal weld seam 11 is thus preferably a flanged seam and the welded joint is designed as a flange welded joint. Alternatively, the longitudinal weld seam 11 may also be designed as an overlapping seam or as a butt seam.

Spacer frames for insulating glazings according to the invention can be produced from the spacer tube 14 according to the invention. For this purpose, the spacer tube 14 has a substantially rectangular cross section, wherein the profile wall 2 has a, preferably planar, top wall 15, one of these opposite and expediently parallel to this, preferably planar, bottom wall 16 and two, preferably planar, side walls 17. The side walls 17 are preferably arranged perpendicular to the top wall 15 and the bottom wall 16. Expediently, a transition wall 18 is additionally provided between each of a side wall 17 and the bottom wall 16. The side walls 17 and the top wall 15 preferably merge directly into each other. Furthermore, the mutually adjoining walls 15, 16, 17, 18 are each arranged at an angle to each other and merge into each other via a bending edge or corner edge 33. The two transition walls 18 are preferably designed as a kind chamfer, that is, the corner between each side wall 17 and the bottom wall 16 is flattened by the transition walls 18.

Furthermore, the extension of the spacer tube 14 is expediently greater in a width direction 19a perpendicular to the longitudinal axis 8 than in a vertical direction 19b perpendicular thereto and to the longitudinal axis 8. Here, the top wall 15 and the bottom wall 16 extend parallel to the longitudinal axis 8 and the width direction 19a and the side walls 17 extend parallel to the longitudinal axis 8 and the height direction 19b.

The top wall 15 is arranged in the installed state of the spacer tube 14 in the insulating glass according to the invention facing a space between two panes cavity facing and the two side walls 17 abut the glass sheets and are connected to these in a conventional manner moisture and airtight by means of a suitable adhesive , The bottom wall 16 thus points away from the space between the panes. As a result, the longitudinal weld 11 is built in State of the spacer tube 14 is not visible, preferably not arranged in the region of the top wall 15. Preferably, the longitudinal weld seam 11 is arranged in the region of one of the two side walls 17.

In the top wall 15 also preferably several known passage recesses or perforation openings 20, preferably introduced in the form of through the top wall 15 continuous slots, in particular punched, the perforations 20 create a fluidic connection between the profile interior 5 and the space between the panes. The perforation openings 20 may at least partially also be designed as elongated holes which extend parallel to the width direction 19 a (not shown).

The manufacture of the spacer tube 14 according to the invention by means of the device according to the invention will now be explained in more detail below.

As already explained above, the production of the spacer tube 14 takes place by means of roll bending and longitudinal welding. For this purpose, first a relatively wide metal strip, in particular a stainless steel strip or an aluminum strip, cut in a metal strip cutting device into a plurality of parallel metal longitudinal strips 10, in particular long strips of stainless steel or aluminum longitudinal strips, and these are preferably wound on a reel. Alternatively, the metal longitudinal strips 10 are already wound on a reel.

Conveniently, at the same time as the production of the metal strips 10, a relatively wide plastic strip is cut into a plurality of mutually parallel plastic longitudinal strips 9 in a plastic strip cutting device and these are preferably wound onto a reel. Alternatively, the plastic strips 9 are already wound on a reel before. In particular, the plastic strip or strips 9 are made by extrusion.

Subsequently, the two strips 9, 10 in an adhesive device, expediently using a hot melt adhesive 23, glued together. The adhesive device has for this purpose an adhesive applicator 21 (FIG. Fig. 4 ), which has a heated melt tank 22 for receiving liquid hotmelt adhesive 23, an applicator roll 24 that can be driven about a horizontal axis of rotation, a counterpressure roller 25 likewise driven about a horizontal axis of rotation, but in an opposite direction of rotation, and expediently two strippers 26, 27, namely a metering scraper 26 and a closure scraper 27. In this case, the application roller 24 is arranged below the melt tank 22, so that it closes it down and the hot melt adhesive 23 is distributed to the melt tank 22 facing region of a lateral surface 24a of the applicator roll 24. The two scrapers 26, 27 are adjacent to the applicator roll 24, spaced therefrom by an annular gap. The distance of the Dosierabstreifer 26 to the applicator roll 24 determines the thickness of the adhesive layer having the applicator roll 24 after passing through the Dosierabstreifers 26 on its lateral surface 24a and thus the thickness of the adhesive layer to be applied. The Verschließabstreifer 27 prevents the adhesive leakage at a standing roller 24. For applying the hot melt adhesive 23 on a metal strip 10 of this is guided in a transport direction 28 between the two rollers 24, 25 through. In this case, the hot melt adhesive 23 received by the application roller 24 from the melting tank 22 is applied to a metal strip upper side 10a of the metal strip 10. After application of the adhesive 23, the plastic strip 9 is placed with a plastic strip underside 10b on the provided with adhesive 23 metal strip top 9a and pressed against this, so that the two strips 9, 10 are glued together over the entire surface and form the profile wall strip 29. In particular, the plastic strip 9 is thereby placed centrally in relation to the extent of the profile wall strip 29 in a strip width direction 30 on the metal strip 10. In addition, the extent of the plastic strip 9 in the strip width direction 30 is less than the extent of the metal strip 10 in the strip width direction 30, so that an edge region 31 of the metal strip 10 is uncoated on both sides ( Fig. 3 ). The joining of plastic strip 9 and metal strip 10 is preferably carried out continuously, in particular horizontal, conveying the metal strip 10 in its longitudinal direction, peeling off the plastic strip 9 of the reel, depositing the plastic strip 9 on the metal strip 10 and pressing the two strips 9, 10 together by means of rollers.

The hotmelt adhesive 23 used is preferably a hotmelt adhesive, in particular a 1-component polyurethane adhesive whose base materials are in particular polyurethane prepolymers with isocyanate groups. Conveniently, the hot melt adhesive 23 used has a density of 1.15 to 1.25 g / cm ³ . In addition, the hot-melt adhesive 23 preferably has a viscosity (dynamic) of 18,000 to 34,000 mPas. The hot melt adhesive 23 is also preferably insoluble in water.

The profile wall strip 29 produced by bonding is expediently fed to a drying device, in particular a drying section, in which the hotmelt adhesive 23 can dry and harden.

Subsequently, the profile wall strip 29 is fed to a notching or embossing device of the device according to the invention, by means of the longitudinal grooves or longitudinal corrugations or longitudinally extending notches 32 are introduced into a direction away from the metal strip 10 plastic strip top side 9a, in particular embossed. The longitudinal grooves 32 extend parallel to a strip longitudinal direction 36 and expediently have a V-shaped cross section. The longitudinal grooves 32 are introduced where the buckling edges 33 lie in the later hollow profile 1. The introduction of the longitudinal grooves 32 takes place expediently by heating the plastic material by means of ultrasound and impressing the, preferably wedge-shaped, longitudinal grooves 32 in the heated material. For this purpose, the notching device has an ultrasonic generating device, a sonotrode for supplying the vibrations generated to the plastic strip 9 to be embossed and an anvil roller drivable about a horizontal axis of rotation. The anvil roll is disposed below the sonotrode and spaced therefrom by a defined gap. The sonotrode has a horizontal, the anvil roll facing stamping surface, which has a plurality of adjacent to each other, projecting from the embossing surface beads for introducing the longitudinal grooves 32. The beads extend parallel to a, suitably horizontal, transport direction and are arranged adjacent to each other perpendicular to the transport direction. The arrangement and number of beads depends on the arrangement and number of bending edges 33. For stamping, the profile wall strip 29 with the plastic upper side 9a of the sonotrode facing in the transport direction, which is parallel to the strip longitudinal direction 36, is carried out between the stamping surface and the anvil roller. In this case, the plastic material is heated by means of the sonotrode and impressed using pressure by means of the beads, the longitudinal grooves 32 in the plastic strip top side 9a.

According to a further embodiment of the invention, a rotating sonotrode is used instead of the stationary sonotrode, which is drivable about a horizontal axis of rotation in the opposite direction of rotation to the anvil roller, wherein the rotational speeds are synchronized. In this case, the sonotrode on its Sonotrodenmantelfläche, projecting from this annular beads, which serve to introduce the longitudinal grooves 32. For this purpose, the beads extend circumferentially in the circumferential direction of the sonotrode roller.

After the insertion of the longitudinal grooves 32, the through holes 20 are expediently introduced into the profile wall strip 29 in a manner known per se in a stamping device. For this purpose, the profile wall strip 29 is performed in a preferably horizontal, parallel to the strip longitudinal direction 36 transport direction between two punching rollers, which in opposite directions of rotation are driven by a respective horizontal axis and are arranged vertically spaced from each other. The punching rollers have corresponding punching means. In particular, the teeth projecting from a stamping roller projecting from its lateral surface and the other punching roller have recesses corresponding thereto.

After introducing the through holes 20, the profile wall strip 29 is continuously deformed into a longitudinally slotted endless hollow profile 38 in a roll bending device or roll forming device of the device according to the invention by rolling deformation, whose cross sectional shape preferably already corresponds to the later desired cross sectional shape. In particular, first the two free edge regions 31 are bent over to the flange swings 13 and then the profile wall strips 29 are bent in such a way to the longitudinally slotted endless hollow profile 38 that the two flange strips 13 abut one another. In particular, the profile wall strip 29 is bent or bent at the longitudinal grooves 32. The profile wall strip 29 is thus bent around the strip longitudinal direction 36 and the later longitudinal axis 8 parallel axes. Furthermore, the profile wall strip 29 is deformed such that the metal strip 10 is on the outside, in particular the metal strip underside 10b forms the profile outer surface 3 and expediently the two flange flanges 13 are arranged at the top. To perform an overlapping weld or butt weld, the appropriate preparation is carried out analogously to the requirements. The roll forming is carried out in a conventional manner with corresponding roll forming tools, in particular with several Umformrollenpaaren (not shown), which are parallel to the strip longitudinal direction 36, preferably horizontal, conveying direction, in which the profile wall strip 29 is conveyed, arranged one behind the other. In this case, the profile wall strip 29 is in each case carried out between the two forming rollers of a Umformrollenpaares. The one forming roller has a concave peripheral surface and the other forming a convex curved peripheral surface, wherein the peripheral surfaces are matched to one another and the curvature of roller pair to roller pair increases so that gradually the profile wall strip 29 is bent to the longitudinally slotted endless hollow profile 38.

In a subsequent to the Rollumformeinrichtung welding device 37 of the device according to the invention, the two abutting Flanschwangen 13 by generating the longitudinal weld 11, in particular continuously, welded together. The welding takes place for example by means of laser welding. For this purpose, the welding device 37 has a laser beam generating device and means for deflecting the laser beam 34 and directing the laser beam 34 onto the flange arms 13 ( Fig. 5 ). In particular, the laser beam 34 is aligned so that it includes with the horizontal conveying direction 35, in which the endless hollow profile 38 is conveyed, or with the surface to be welded, an angle a of 8 to 25 °, preferably 10 to 15 °. This causes the laser beam 34 to strike the material to be welded in the form of an elliptical point, resulting in a longer molten bath and better introducing the energy into the material. This is a considerable advantage, especially with the thin wall thickness of the outer wall 6, and ensures reliable welding.

The welder 37 is followed by a known calibration device of the device according to the invention, in which the welded continuous hollow profile 38 is calibrated to its final cross-sectional shape. The calibration device expediently has several calibration rollers in a manner known per se.

In addition, the device according to the invention also has a device adjoining the calibration device for separating the endless hollow profile 38 into spacer tubes 14 of predetermined length. The separating device is, for example, a flying saw, that is to say a saw which moves in the conveying direction during cutting with the endless hollow profile 38.

The spacer tube 14 according to the invention has due to the plastic inner wall 7 and due to its possible small wall thickness of the metal outer wall 6 a very low linear heat transfer coefficients. In particular, the linear heat transfer coefficient is 0.03 to 0.07 W / mK, preferably 0.035 to 0.05 W / mK. The small wall thickness of the metal outer wall 6 also has the advantage that enormous material costs are saved in comparison to pure metal hollow profiles. The provision of so small wall thicknesses for the metal outer wall 6 is above all possible because the plastic inner wall 7 supports and stabilizes the metal outer wall 6, so that in particular even with such small wall thickness, the flange 13 can be pressed together with sufficient contact forces and secure welding is achieved ,

Furthermore, the spacer tube 14 according to the invention is extremely easy to process further. In particular, the spacer tubes 14 according to the invention can be bent into spacer frames in a conventional manner and on conventional machines.

Due to the metallic profile outer surface 3, the spacer tube 14 according to the invention can also be painted without difficulty. In addition, the profile outer surface 3 is UV-resistant. The stainless steel outer wall spacer tubes 14 according to the invention may also be used in the renovation or demolition of buildings in which conventional stainless steel or metallically glossy spacer spacers have heretofore been used because of the stainless steel exterior surface.

In addition, the special selection of the hotmelt adhesive 23 and the plastic material is particularly advantageous, whereby a solid or non-permanent, permanent bond between the plastic strip 9 and the metal strip 10 or the inner wall 7 and the outer wall 6 is created.

It is also favorable that also the production of the spacer tube 14 according to the invention take place as far as possible on conventional machines can. Only the cutting and sticking of the plastic strip 9 on the metal strip 10 and the impressing of the longitudinal grooves 32 is added. The impressing of the longitudinal grooves 32 in turn has the advantage that the restoring forces are negligible after roll forming, since no plastic material is displaced during roll forming.

Furthermore, as explained above, it is also within the scope of the invention to coat the spacer tube with paint on the outside. For this purpose, e.g. First, a relatively wide metal strip, which is suitably wound on a reel, deducted from this, performed by a paint coater and continuously coated in one side with this color. The coating is carried out by applying the paint e.g. by means of a per se known roller pressure device with an applicator roll. After the subsequent drying of the ink in a drying device, through which the coated metal strip is expediently carried out continuously, the coated metal strip is cut into a plurality of mutually parallel longitudinal strips 10. This is expediently also carried out continuously in a cutting device.

Furthermore, the manufacturing process as a whole or the individual process steps can take place continuously, ie in a single production line or else not continuously, in individual separate devices. In the continuous process, the individual devices are arranged downstream of each other according to the process sequence.

In addition, the introduction of the longitudinal grooves in the plastic strip 9 can also be effected by means of a profiled and heated profile disc or another type of material displacement under thermal influence.

In addition, it is also possible, instead of the metal strip 10, to provide the plastic strip with adhesive 23. In particular, in this case, the adhesive 23 is applied to the plastic strip underside 9b, wherein the Plastic strip 9 with the plastic strip bottom 9b of the applicator roll 24 facing between the two rollers 24, 25 is performed. Subsequently, both strips 9, 10 are glued together as described above.

Claims (18)

1. A spacer tube (14) in the form of a tubular hollow profile (1) for the production of spacer frames for insulating glazing, with a profile wall (2) with a metallic outer profile surface (3) and an inner profile wall (4), wherein the inner profile wall (4) surrounds an internal profile space (5),
   characterised in that
   the profile wall (2) is designed to be double-walled, in that it consists of an outer wall (6) of metal, in particular high-grade steel or aluminium, and an inner wall (7) of plastics material, which are connected securely together, the outer wall (6) having a wall thickness of 0.04 to 0.1 mm and the inner wall (7) having a wall thickness of 0.15 to 0.5 mm.
2. A spacer tube according to Claim 1, characterised in that the spacer tube (1) is produced by rolling deformation, in particular from a double-layer profile wall strip (29), and is welded on a long side, in the region of two longitudinal edges (12), by a longitudinal weld seam (11).
3. A spacer tube according to Claim 2, characterised in that the two longitudinal edges (12) are bent over to form flange cheeks (13) which are welded together by means of the longitudinal weld seam (11), or the longitudinal weld seam (11) is embodied as an overlapping seam or as a butt weld.
4. A spacer tube according to one of the preceding claims, characterised in that the inner wall (7) and the outer wall (6) are glued together, in particular by means of a hot-melt adhesive (23), the hot-melt adhesive (23) expediently being a high-temperature
   hot-melt adhesive (23), preferably a 1-component polyurethane adhesive, the base substances of which are in particular polyurethane prepolymers with isocyanate groups.
5. A spacer tube according to one of the preceding claims, characterised in that the outer wall (6) has a wall thickness of 0.05 to 0.08 mm.
6. A spacer tube according to one of the preceding claims, characterised in that the inner wall (7) has a wall thickness of 0.3 mm.
7. A spacer tube according to one of the preceding claims, characterised in that the plastics material of the inner wall (7) is a rotting plastics material and/or a plastics material made from renewable raw materials, and preferably has the following material properties (alternatively or cumulatively): Standard preferably Tensile strength σ_M [MPa] DIN EN ISO 527-1:1996-04 40 to 60 45 to 55 Extension ε_M [%] DIN EN ISO 527-1:1996-04 2 to 2.8 2.3 to 2.5 Breaking stress σ_B) [MPa] DIN EN ISO 527-1:1996-04 20 to 30 23 to 27 Elongation at break ε_M [%] DIN EN ISO 527-1:1996-04 7 to 10 9 to 9.8 Tensile modulus of elasticity E [MPa] DIN EN ISO 527-1:1996-04 2600 to 2800 2720 to 2780 Impact strength (23°C) a_cU [kJm²] EN ISO 179-1:2006-05 50 to 65 55 to 60 Melt flow index (190°C/2. 16 kg) [g/1 min] DIN ISO 1133:2005-09 3 to 5 4 to 4.5 Density [g/cm³] 1 to 1.3 1.2 to 1.25
8. Insulating glazing with two panes which are arranged parallel to each other and spaced apart from each other, between which a pane interspace is provided, and with a peripheral spacer frame arranged in the pane interspace, which frame is constructed from one or more spacer tubes, wherein a spacer tube (14) has a profile wall (2) with two side walls (17), wherein the side walls (17) lie against the panes and are connected thereto in moisture-tight and airtight manner by means of an adhesive,
   characterised in that
   the spacer tube (14) or the spacer tubes (14) are formed in accordance with one of the preceding claims.
9. A device for the, in particular continuous, production of a spacer tube (14) according to one of Claims 1 to 7, having

   a) expediently a metal-strip cutting means for cutting up a metal band, in particular a high-grade steel band or an aluminium band, into a plurality of longitudinal metal strips (10), in particular high-grade steel strips or aluminium strips, which are parallel to each other,

   b) expediently a plastics-material-strip cutting means for cutting up a plastics-material band into a plurality of longitudinal plastics-material strips (9) which are parallel to each other,

   c) a gluing means for gluing the metal strip (10) to the plastics-material strip (9) to form a profile wall strip (29) with two lateral longitudinal edges (12),

   d) expediently a notching or embossing means for introducing longitudinal grooves (32) into an upper side (9a) of the plastics-material strip (9) which is directed away from the metal strip (10),

   e) a rolling-bending means for deforming the profile wall strip (29) to form a longitudinally slit endless hollow profile (38), the regions of which which have the longitudinal edges (12) abut one another,

   f) a welding means (37) for producing a longitudinal weld seam (11) by welding together the two regions which have the longitudinal edges (12),

   g) expediently a calibration means for calibrating the cross-sectional form of the endless hollow profile (38), and

   h) a separating means for separating the endless hollow profile (38) into spacer tubes (14) of specified length.
10. A device according to Claim 9, characterised in that
    the gluing means has an adhesive application means (21) which has a heatable melting tank (22) for holding liquid hot-melt adhesive (23), an application roller (24) which can be driven about a horizontal axis of rotation, a counter-pressure roller (25) which can likewise be driven about a horizontal axis of rotation in the opposite direction of rotation, and expediently two scrapers (26, 27), namely a metering scraper (26) and a closing scraper (27).
11. A device according to Claim 9 or 10, characterised in that the notching means has means for introducing the longitudinal grooves (32) by means of ultrasound, the notching means preferably having an ultrasound generation means, a sonotrode for guiding the oscillations generated to the plastics-material strip (9) to be embossed, and an anvil roller which can be driven about a horizontal axis of rotation for transporting the profile wall strip (29), the sonotrode preferably being a stationary or a rotating sonotrode.
12. A. device according to one of Claims 9 to 11, characterised in that the welding means (37) has a laser-beam generation means and means for deflecting a laser beam (34) and directing the laser beam (34) onto the regions of the endless hollow profile (38) which are to be welded, the laser beam (34) preferably being oriented such that it encloses, with a conveying direction (35) in which the endless hollow profile (38) can be conveyed for welding, an angle α of 8 to 25°, preferably 10 to 15°.
13. A method for the, in particular continuous, production of a spacer tube (14) according to one of Claims 1 to 7, preferably using a device according to one of Claims 9 to 12, with the following method steps:

    a) expediently cutting up a metal band, in particular a high-grade steel band or an aluminium band, into a plurality of longitudinal metal strips (10), in particular longitudinal high-grade steel strips or longitudinal aluminium strips, which are parallel to each other,

    b) expediently cutting up a plastics-material band into a plurality of longitudinal plastics-material strips (9) which are parallel to each other,

    c) gluing the metal strip (10) to the plastics-material strip (9) to form a profile wall strip (29) with two lateral longitudinal edges (12),

    d) expediently introducing longitudinal grooves (32) into an upper side (9a) of the plastics-material strip (9) which is directed away from the metal strip (10),

    e) rolling deformation of the profile wall strip (29) to form a longitudinally slit endless hollow profile (38), in which the two regions of which which have the longitudinal edges (12) lie against one another, the profile wall strip (29) being bent such that the metal strip (10) forms an outer wall (6), and the plastics-material strip (9) an inner wall (7), of the endless hollow profile (38),

    f) production of a longitudinal weld seam (11) by welding together the regions which have the two longitudinal edges (12),

    g) expediently calibrating the endless hollow profile (38) to its final cross-sectional form,

    h) separating the endless hollow profile (38) into spacer tubes (14) of defined length.
14. A method according to Claim 13, characterised in that
    for gluing, a hot-melt adhesive (23) is used which expediently is a high-temperature hot-melt adhesive (23), preferably a 1-component polyurethane adhesive, the base substances of which are in particular polyurethane prepolymers with isocyanate groups.
15. A method according to Claim 13 or 14, characterised in that for gluing, the adhesive (23) is applied to an upper side (10a) of a metal strip or an underside (9b) of a plastics-material strip and then the plastics-material strip (9) is arranged with an underside (9b) of a plastics-material strip on the upper side (10a) of the metal strip which is provided with adhesive, and the strips (9; 10) are preferably pressed against one another, the hot-melt adhesive (23) being applied preferably continuously by means of an application roller (24) to the upper side (10a) of the metal strip or the underside (9b) of the plastics-material strip.
16. A method according to one of Claims 13 to 15, characterised in that the longitudinal grooves (32) are produced by means of heating the plastics material by ultrasound and pressing the longitudinal grooves (32) into the heated material.
17. A method according to one of Claims 13 to 16, characterised in that upon the rolling deformation the profile wall strip (29) is bent or bent over in the region of the longitudinal grooves (32), so that bent edges (33) of the endless hollow profile (38) lie in the region of the longitudinal grooves (32).
18. A method according to one of Claims 13 to 17, characterised in that the welding takes place by laser-beam welding by means of a laser beam (34) directed at the material to be welded, with expediently a laser beam (34) being used which encloses, with a conveying direction (35) in which the endless hollow profile (38) is conveyed, an angle α of 8 to 25°, preferably 10 to 15°.

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