EP3155933B1 - Air core, in particular for a mattress or cushion, and method for producing the same - Google Patents
Air core, in particular for a mattress or cushion, and method for producing the same Download PDFInfo
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- EP3155933B1 EP3155933B1 EP15189607.3A EP15189607A EP3155933B1 EP 3155933 B1 EP3155933 B1 EP 3155933B1 EP 15189607 A EP15189607 A EP 15189607A EP 3155933 B1 EP3155933 B1 EP 3155933B1
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- laser light
- air core
- valve
- water vapor
- layer
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C27/00—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas
- A47C27/08—Fluid mattresses or cushions
- A47C27/081—Fluid mattresses or cushions of pneumatic type
Definitions
- the present invention relates to an air core according to the preamble of claim 1 and to a sleep system equipped therewith and to a method for producing the air core.
- Sleep systems based on an air core are already well known and commercially available.
- An important advantage over other systems, which are based for example on conventional mattresses or water-filled chambers, is the possibility of continuous adjustment of the degree of hardness.
- a generic air core is for example in the EP 1416833 B1 described.
- films of polyurethane have hitherto been welded using a high frequency process.
- films with a thickness of about 300 microns or more must be used, otherwise no sufficiently airtight seam can be welded.
- other welding processes such as ultrasonic welding, hot pressing, hot bonding or friction welding airtight constructions are possible, but also here must be used to ensure an airtight joint similar robust films.
- the breathability ie the removal of moisture, is much lower than would be desirable. For this reason, the conventional air cores must be provided with relatively thick pads that absorb and store body moisture.
- An object of the invention is therefore to provide an improved air core, which is particularly suitable for a mattress or a pillow.
- each of the webs has at least one water vapor permeable outer textile layer (A, A ') and an airtight, water vapor permeable inner membrane layer (B, B'), wherein each of the inner membrane layers has a thickness of 1 to 100 ⁇ m.
- the inner membrane layers and the outer textile layers are formed from thermoplastic polyesters which are compatible in terms of welding and are firmly bonded to one another in the joining zone by the action of laser light and application of pressure, the inner membrane layers and at least one of the outer textile layers and a collar region of the valve being transparent to laser light. and wherein between the webs, at least in the region of the joining zone and the valve, a laser light absorbing middle layer (C) is located.
- the measures of the invention initially have the consequence that those layers which ensure the significant combination of features of airtightness and water vapor permeability, so here the inner membrane layers, in comparison to the prior art have a smaller thickness.
- This advantageous combination is made possible by the joining technique used the laser transmission welding, which due to the inventive arrangement with transparent outer layers and transparent valve collar and an absorbent middle layer (C) allows a localized energy input into the interior of the layer stack.
- thinner layers can be used, it being understood that the desired combination of airtightness and water vapor permeability is achieved by expert choice of suitable materials.
- the air cores according to the invention are particularly suitable for mattresses and can therefore be integrated into high-quality sleep systems.
- the inventive air cores are also suitable for pillows of all types and shapes, which include pillows and pfulmen for sleep systems, but also seat cushions, back supports and other cushion elements in living systems. Another important application is the outpatient and inpatient medical field.
- thermoplastic materials The technique of laser transmission welding of thermoplastic materials is known per se, and accordingly there are already commercially available welding machines for it.
- the laser radiation used may in principle be in different spectral ranges, for some applications a wavelength in the region around 1 ⁇ m in the near infrared (NIR) has proven to be advantageous.
- NIR near infrared
- diode lasers have proven to produce laser light in this spectral region.
- An application of laser transmission in the textile sector is in EP 2810772 A1 described, where it is about the production of a water vapor permeable but waterproof textilaminate. This comprises as a top layer a plastic fiber threads having open fabric and a lower layer, a film-like water vapor permeable waterproof thermoplastic membrane sheet.
- the laser welding process is set to the effect that cohesive Verschmelzungsstellen between the membrane web and the raised thread points of the fabric are created.
- the layers welded together ie the inner membrane layers and the outer textile layers, can in principle all be formed from the same thermoplastic polyester.
- they are formed from weld-compatible thermoplastic polyesters, which usually requires a similar chemical nature and a similar melting temperature.
- the melting temperatures should differ by at most 20 ° C.
- the water vapor-permeable outer textile layers (A or A ') can be in the form of woven or knitted fabrics and advantageously have a weight per unit area of 80 to 140 g / m 2 .
- the air core can have a completely symmetrical layer structure, ie a structure ABCBA, in which the two textile layers A are made of a first thermoplastic polyester and have the same thickness, and in which the two membrane layers B are also made of a second thermoplastic polyester and also have the same thickness.
- the first and second thermoplastic polyesters are identical, but at least compatible in terms of welding technology.
- less symmetrical arrangements are possible and expedient in order to achieve the best possible design of serving as the top or bottom of the air core pages.
- the two textile layers A and A 'of different thermoplastic Be polyesters and they can also have different thicknesses.
- the inner membrane layers (B, B ') are preferably formed from one and the same thermoplastic polyester, but may have different thicknesses.
- the two textile layers A or A ' are transparent to laser light, so that the layers to be welded are accessible at all.
- Another object of the invention is to provide an improved sleep system.
- This further object is achieved by the sleep system defined in claim 10, which achieves at least one air core according to the invention and a pressure regulator device which can be connected to the closable valve of the air chamber.
- a sleep system may also include a plurality of air cores, wherein the internal pressure or hardness are suitably controlled independently.
- Such a multi-chamber system is in itself from the EP 0992206 B1 known, but there for conventional air chambers.
- the quality of the welding of the airtight, water vapor permeable membrane layers (B) and (B '), including the intermediate absorbent layer (C), is decisive for the required tightness of the air chamber.
- the welded connection with the fabric layers (A) and (A '), however, is important for the cohesion and mechanical strength of the air chamber.
- the dimensions of the air core are not subject to any particular restrictions and can therefore be selected according to the desired purpose.
- the dimensions of the air core must be selected in particular according to the size of the lying surface and the number of air cores installed therein.
- each of the inner membrane layers (B, B ') has a thickness of 10 to 50 microns, preferably from 20 to 40 microns.
- the inner membrane layers (B, B ') are formed from a polyether ester. Suitable materials in the form of thin film webs are commercially available, for example under the name Sympatex TM from the company Sympatex Technologies GmbH in Unterfohring (D).
- At least one of the inner membrane layers has a measured according to ISO 11092 water vapor resistance Ret of at most 20 m 2 Pa / W. Expediently, this is the inner membrane layer which is located on the side facing away from the valve and, when installed in a sleep system, comes to rest on the side facing the person.
- a middle layer (C) absorbing laser light to be present between the sheets to be fused, that is to say between the two inner membrane layers (B, B ').
- the middle layer C is heated above the melting point of the thermoplastic polymer, so that under the action of a mechanical pressure, the desired joining zone, i. forms an air-tight weld.
- the middle layer (C) is formed as a light-absorbing coating of at least one of the inner membrane layers (B, B ').
- carbon black can be applied as the coating material.
- commercially available coating agents such as Clearweld TM from Crysta-Lyn Chemical Company, Binghamton, NY (USA) may also be used. Such coatings preferably have a layer thickness of 0.5 to 1 .mu.m.
- the middle layer (C) as another membrane layer of a laser light absorbing thermoplastic polymer having a thickness of 1 to 50 microns, preferably 10 to 40 microns, and more preferably from 10 to 20 microns formed.
- a black membrane made of a polyether ester which is available, for example, under the trade name Sympatex Standard Black from the company Sympatex Technologies GmbH.
- the further membrane layer (C) has a water vapor transmission resistance Ret of at most 20 m 2 Pa / W.
- the air chamber has airtightness according to EN / ISO 9237 of better than 0.02 Lm -2 s -1 at a pressure difference of 2 mbar. This avoids too frequent refilling of compressed air via the pressure regulator device.
- the circumferential joining zone has a width of at most 2 mm, preferably from 0.2 to 1 mm. This avoids a potentially annoying stiffness of the air core.
- a diode laser with a wavelength in the range from 0.9 to 1.1 ⁇ m is preferably used (claim 12).
- this spectral range there are transparent as well as light-absorbing thermoplastic polymers suitable for laser transmission welding.
- the contact pressure is applied by means of a transparent to the laser light, preferably air-bearing ball (claim 13). It is typically about 0.5 to 1.5 bar, preferably about 0.9 to 1.1 bar.
- a transparent to the laser light preferably air-bearing ball (claim 13).
- a laser beam is focused on the joining zone via an air-bearing, almost friction-free rotatable glass ball.
- the glass ball acts on the one hand as an optical element for focusing the laser beam and on the other hand serves as a mechanical Pressure means. While the ball rolls on the joining zone, a permanent and punctual contact pressure is exerted. With such an arrangement, the thermal energy of the laser is introduced only where a contact pressure is applied.
- a film of polyethylene (PE) with a thickness of 150 to 400 microns is preferably used, which is characterized by good elasticity and stability and has good transparency for radiation in the range of 0.9 to 1.1 microns .
- a film of polytetrafluoroethylene (PTFE) having a thickness of 100 to 300 microns can be used.
- Fig. 1 to 6 not shown to scale, but the thicknesses of different components or the vertical distances between components are shown greatly enlarged.
- the Indian Fig. 1 illustrated air core 2 comprises an air chamber 4 with an airtight, water vapor permeable casing 6, which is formed by in a circumferential joining zone 8 welded together webs 10, 12.
- the air chamber is provided with a lockable valve, not shown here for the inlet and outlet of air.
- Each web is formed by a water vapor permeable outer textile layer A or A 'of a polyester and an airtight, water vapor permeable inner membrane layer B or B' of one and the same thermoplastic polymer.
- the inner membrane layers are welded together in the joining zone 8 by the action of laser light and application of pressure cohesively.
- the lower membrane layer B is provided near the edge of the layer stack with a laser light absorbing coating C, which is required to form the joining zone 8 by means of laser transmission welding. For the same reason, at least the layers A 'and B' lying above the joining zone must be transparent to the laser light.
- the Fig. 1 shows only the near-edge parts of the air core 2, and in particular the lockable valve is not shown.
- the Fig. 3 shows a central portion of the air core of Fig. 2 , In particular, this is the valve 14 guided through a punched-out region of the film layer.
- This has a collar part 16 made of a thermoplastic material which is transparent to the laser light.
- the schematically illustrated laser beam L can be focused on the absorbent layer C through the collar portion.
- the laser beam is transmitted through an air-bearing, transparent to the laser light glass ball K and focused.
- the glass ball also serves as a means for exerting a contact pressure P, which presses the collar member 16 against the underlying layer CBA.
- Such laser transmission welding forms a circumferential sealing zone 18 between the collar part 16 and the layer stack CBA. This is in the representation of Fig. 3 already formed in the right part and is formed straight in the left part.
- the support table comprises a table plate 22 provided with through holes 20 and a support plate 24 thereon, which advantageously consists of aluminum.
- the support plate 24 is provided with a central recess 26.
- a passage for the valve 14 is punched out in a central region of the first path, and then the first web is placed together with the valve on the support plate 24 so that the edges of the first web over the support plate 24 protruding on the table top 22 and rest the valve is inserted into the recess 26 while its collar portion 16 is above the laid-up web.
- the suction means are turned on, whereby air is withdrawn through the through holes 20 and thereby the first web ABC is fixed to the table top 22.
- the valve collar is welded by means of laser transmission welding with the first web ABC to form the circumferential sealing zone 18 as already in connection with the Fig. 3 explained.
- a second web formed by a second airtight, water vapor permeable membrane layer B 'and, overlying, a second water vapor permeable fabric layers A 'launched, whereby a layer stack (A', B ', C, B, A) is formed.
- a transparent laser-transparent vacuum-tight holding film D is applied over the entire stack of sheets and clamped against the table top 22 to fix the stack of sheets.
- the circumferential joining zone 8 in turn formed by laser transmission welding.
- the laser beam is transmitted through an air-bearing, transparent to the laser light glass ball K and focused on the absorbent layer C.
- the glass ball also serves as a means for exerting a contact pressure P, which presses the layers (A ', B', C, B, A) against the underlying support plate 24.
- the circumferential joining zone 8 is formed. This is in the representation of Fig. 6 already formed in the right part and is formed straight in the left part.
- Air cores of various dimensions were produced by the method described above, using a device with airborne spherical optics "GloboOptik” from Leister Technologies AG, Kägiswil, Switzerland, for laser transmission welding.
- the laser source was a laser diode with an emission wavelength of 940 nm.
- the optics were mounted on an XY vacuum table, which prevents shifting of the layers during welding.
- all joint lines can be realized, which can be identified with a CAD editing program in a two-dimensional surface. In particular, it can be used to control circumferential joint lines in a circular or rectangular shape.
- the process parameters must be selected according to the thickness and the optical and thermal properties of the materials used. It may therefore be necessary in preliminary experiments to determine the minimum laser energy with which the layers fuse together and have the desired strengths, but undergo no thermal damage.
- the measured airtightness according to EN / ISO 9237 at a pressure difference of 2 mbar was better than 0.02 Lm -2 s -1 .
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- Lining Or Joining Of Plastics Or The Like (AREA)
Description
Die vorliegende Erfindung betrifft einen Luftkern gemäss Oberbegriff des Anspruchs 1 sowie ein damit ausgestattetes Schlafsystem und ein Verfahren zur Herstellung des Luftkerns.The present invention relates to an air core according to the preamble of claim 1 and to a sleep system equipped therewith and to a method for producing the air core.
Schlafsysteme auf der Basis eines Luftkerns sind bereits hinlänglich bekannt und im Handel erhältlich. Ein wichtiger Vorteil gegenüber anderen Systemen, die beispielsweise auf herkömmlichen Matratzen oder auf wassergefüllten Kammern beruhen, ist die Möglichkeit der stufenlosen Einstellung des Härtegrades. Ein gattungsgemässer Luftkern ist beispielsweise in der
Für die Anwendung als Kern eines Luftbetts wurden bislang Folien aus Polyurethan (PU) mit einem Hochfrequenzverfahren verschweisst. Hierfür müssen jedoch Folien mit einer Dicke von ungefähr 300 µm oder mehr verwendet werden, da sonst keine ausreichend luftdichte Naht geschweisst werden kann. Auch mit anderen Schweissverfahren wie Ultraschallschweissen, Heisspressen, Heisskleben oder Reibschweissen sind luftdichte Konstruktionen möglich, aber auch dabei müssen zur Gewährleistung einer luftdichten Fügung ähnlich robuste Folien eingesetzt werden. Bei der Verwendung solch dicker Folienmaterialien ist jedoch die Atmungsaktivität, d.h. der Abtransport von Feuchtigkeit, wesentlich geringer als es wünschenswert wäre. Aus diesem Grund müssen die herkömmlichen Luftkerne mit vergleichsweise dicken Auflagen versehen werden, welche die Körperfeuchtigkeit aufnehmen und speichern.For use as the core of an air bed, films of polyurethane (PU) have hitherto been welded using a high frequency process. For this purpose, however, films with a thickness of about 300 microns or more must be used, otherwise no sufficiently airtight seam can be welded. Even with other welding processes such as ultrasonic welding, hot pressing, hot bonding or friction welding airtight constructions are possible, but also here must be used to ensure an airtight joint similar robust films. However, when using such thicker sheet materials, the breathability, ie the removal of moisture, is much lower than would be desirable. For this reason, the conventional air cores must be provided with relatively thick pads that absorb and store body moisture.
Ein weiterer Nachteil der bekannten Luftkerne besteht darin, dass mit den bislang verwendeten Schweissverfahren vergleichsweise breite Schweissnähte mit einer Breite von 0.5 bis 1 cm entstehen, welche eine unerwünschte Steifheit und eine suboptimale Haptik mit sich bringen. Zudem entstehen bei Bewegungen und Gewichtsverlagerungen des Nutzers teilweise etwas störende Geräusche.Another disadvantage of the known air cores is that with the welding methods used so far comparatively wide weld seams with a width of 0.5 to 1 cm arise, which bring an undesirable stiffness and a suboptimal feel with it. In addition, some disturbing noises arise during movements and weight shifts of the user.
Eine Aufgabe der Erfindung ist es demnach, einen verbesserten Luftkern, der insbesondere für eine Matratze oder ein Kissen geeignet ist, bereitzustellen.An object of the invention is therefore to provide an improved air core, which is particularly suitable for a mattress or a pillow.
Gelöst wird diese Aufgabe durch den im Anspruch 1 definierten Luftkern. Dieser umfasst mindestens eine Luftkammer mit einer luftdichten, wasserdampfdurchlässigen Hülle, welche durch in einer umlaufenden Fügezone miteinander verschweisste Bahnen gebildet ist, wobei die Luftkammer mit einem verschliessbaren Ventil zum Ein- und Auslassen von Luft versehen ist. Erfindungsgemäss weist jede der Bahnen zumindest eine wasserdampfdurchlässige äussere Textillage (A, A') und eine luftdichte, wasserdampfdurchlässige innere Membranlage (B, B') auf, wobei jede der inneren Membranlagen eine Dicke von 1 bis 100 µm aufweist. Die inneren Membranlagen und die äusseren Textillagen sind aus schweisstechnisch kompatiblen thermoplastischen Polyestern gebildet und in der Fügezone mittels Einwirkung von Laserlicht und Anwendung von Druck miteinander stoffschlüssig verschweisst, wobei die inneren Membranlagen sowie zumindest eine der äusseren Textillagen und ein Kragenbereich des Ventils für Laserlicht transparent sind, und wobei sich zwischen den Bahnen zumindest im Bereich der Fügezone und des Ventils eine Laserlicht absorbierende Mittelschicht (C) befindet.This object is achieved by the air core defined in claim 1. This comprises at least one air chamber with an airtight, water vapor-permeable casing, which is formed by in a circumferential joining zone welded together webs, wherein the air chamber is provided with a closable valve for intake and exhaust of air. According to the invention, each of the webs has at least one water vapor permeable outer textile layer (A, A ') and an airtight, water vapor permeable inner membrane layer (B, B'), wherein each of the inner membrane layers has a thickness of 1 to 100 μm. The inner membrane layers and the outer textile layers are formed from thermoplastic polyesters which are compatible in terms of welding and are firmly bonded to one another in the joining zone by the action of laser light and application of pressure, the inner membrane layers and at least one of the outer textile layers and a collar region of the valve being transparent to laser light. and wherein between the webs, at least in the region of the joining zone and the valve, a laser light absorbing middle layer (C) is located.
Dabei haben die Massnahmen der Erfindung zunächst einmal zur Folge, dass diejenigen Lagen, welche die bedeutsame Merkmalskombination von Luftdichtigkeit und Wasserdampfdurchlässigkeit gewährleisten, hier also die inneren Membranlagen, im Vergleich zum Stand der Technik eine geringere Dicke aufweisen. Ermöglicht wird diese vorteilhafte Kombination durch die verwendete Fügetechnik des Laserdurchstrahlschweissens, welche aufgrund der erfindungsgemässen Anordnung mit transparenten äusseren Lagen und transparentem Ventilkragen sowie einer absorbierenden Mittelschicht (C) einen lokalisierten Energieeintrag in das Innere des Lagenstapels ermöglicht. Damit lassen sich generell dünnere Lagen verwenden, wobei es sich versteht, dass die gewünschte Kombination von Luftdichtigkeit und Wasserdampfdurchlässigkeit durch fachmännische Wahl geeigneter Materialien erreicht wird.The measures of the invention initially have the consequence that those layers which ensure the significant combination of features of airtightness and water vapor permeability, so here the inner membrane layers, in comparison to the prior art have a smaller thickness. This advantageous combination is made possible by the joining technique used the laser transmission welding, which due to the inventive arrangement with transparent outer layers and transparent valve collar and an absorbent middle layer (C) allows a localized energy input into the interior of the layer stack. In general, thinner layers can be used, it being understood that the desired combination of airtightness and water vapor permeability is achieved by expert choice of suitable materials.
Die erfindungsgemässen Lufkerne sind insbesondere für Matratzen geeignet und können demnach in hochwertige Schlafsysteme integriert werden. Darüber hinaus eignen sich die erfindungsgemässen Luftkerne auch für Kissen aller Art und Form, zu denen Kopfkissen und Pfulmen für Schlafsysteme, aber auch Sitzkissen, Rückenstützen und weitere Kissenelemente in Wohnsystemen gehören. Ein weiteres wichtiges Einsatzgebiet ist der ambulante und stationäre medizinische Bereich.The air cores according to the invention are particularly suitable for mattresses and can therefore be integrated into high-quality sleep systems. In addition, the inventive air cores are also suitable for pillows of all types and shapes, which include pillows and pfulmen for sleep systems, but also seat cushions, back supports and other cushion elements in living systems. Another important application is the outpatient and inpatient medical field.
Die Technik des Laserdurchstrahlschweissens von thermoplastischen Materialien ist an sich bekannt, und entsprechend gibt es auch bereits kommerziell erhältliche Schweissgeräte dafür. Wenngleich die verwendete Laserstrahlung grundsätzlich in verschiedenen Spektralgebieten liegen kann, hat sich für manche Anwendungen eine Wellenlänge in der Region um 1 µm im Nahinfrarot (NIR) als vorteilhaft erwiesen. Zur Erzeugung von Laserlicht in diesem Spektralgebiet haben sich unter anderem Diodenlaser bewährt. Eine Anwendung des Laserdurchstrahlschweissens im textilen Bereich ist in der
Wenn im vorliegenden Zusammenhang für einzelne Lagen von Transparenz bzw. Absorptionsfähigkeit für Laserlicht die Rede ist, soll darunter das optische Verhalten aller erwähnten Lagen im Spektralbereich ein und desselben Lasers, typischerweise also in der Region um 1 µm, verstanden werden.If in the present context for individual layers of transparency or absorbency for laser light is mentioned, it should be understood as the optical behavior of all mentioned layers in the spectral range of one and the same laser, typically in the region of 1 micron.
Weiterhin versteht sich, dass die Begriffe "aussen" bzw. "innen" im Zusammenhang mit einzelnen Lagen relativ zu derjenigen Zone, welche bei befülltem Luftkern dessen Innenraum bildet, definiert sind.Furthermore, it is understood that the terms "outside" or "inside" are defined in relation to individual layers relative to that zone which forms its interior when the air core is filled.
Die miteinander verschweissten Lagen, also die inneren Membranlagen und die äusseren Textillagen, können grundsätzlich alle aus demselben thermoplastischen Polyester gebildet sein. Auf jeden Fall sind sie aus schweisstechnisch kompatiblen thermoplastischen Polyestern gebildet, was in aller Regel eine ähnliche chemische Beschaffenheit sowie eine ähnliche Schmelztemperatur erfordert. Vorzugsweise sollten sich die Schmelztemperaturen um höchstens 20ºC unterscheiden.The layers welded together, ie the inner membrane layers and the outer textile layers, can in principle all be formed from the same thermoplastic polyester. In any case, they are formed from weld-compatible thermoplastic polyesters, which usually requires a similar chemical nature and a similar melting temperature. Preferably, the melting temperatures should differ by at most 20 ° C.
Die wasserdampfdurchlässigen äusseren Textillagen (A bzw. A') können je nach spezifischer Anwendung als Gewebe oder Gestrick vorliegen und haben vorteilhafterweise ein Flächengewicht von 80 bis 140 g/m2.Depending on the specific application, the water vapor-permeable outer textile layers (A or A ') can be in the form of woven or knitted fabrics and advantageously have a weight per unit area of 80 to 140 g / m 2 .
Grundsätzlich kann der Luftkern eine völlig symmetrische Lagenstruktur haben, d.h. eine Struktur A-B-C-B-A, bei der die beiden Textillagen A aus einem ersten thermoplastischen Polyester gefertigt sind und dieselbe Dicke aufweisen, und bei der zudem die beiden Membranlagen B aus einem zweiten thermoplastischen Polyester gefertigt sind und ebenfalls dieselbe Dicke aufweisen. Dabei sind der erste und zweite thermoplastische Polyester identisch, zumindest aber schweisstechnisch kompatibel zueinander. Allerdings sind auch weniger symmetrische Anordnungen möglich und zweckmässig, um eine möglichst optimale Ausgestaltung der als Ober- bzw. Unterseite des Luftkerns dienenden Seiten zu erreichen. Insbesondere können die beiden Textillagen A und A' aus unterschiedlichen thermoplastischen Polyestern sein und sie können auch unterschiedliche Dicken aufweisen. Demgegenüber sind die inneren Membranlagen (B, B') vorzugsweise aus ein und demselben thermoplastischen Polyester gebildet, können aber unterschiedliche Dicken aufweisen. Für die Herstellbarkeit mittels Laserdurchstrahlschweissen ist entscheidend, dass mindestens eine der beiden Textillagen A oder A' für Laserlicht transparent ist, damit die zu verschweissenden Lagen überhaupt zugänglich sind.In principle, the air core can have a completely symmetrical layer structure, ie a structure ABCBA, in which the two textile layers A are made of a first thermoplastic polyester and have the same thickness, and in which the two membrane layers B are also made of a second thermoplastic polyester and also have the same thickness. In this case, the first and second thermoplastic polyesters are identical, but at least compatible in terms of welding technology. However, less symmetrical arrangements are possible and expedient in order to achieve the best possible design of serving as the top or bottom of the air core pages. In particular, the two textile layers A and A 'of different thermoplastic Be polyesters and they can also have different thicknesses. In contrast, the inner membrane layers (B, B ') are preferably formed from one and the same thermoplastic polyester, but may have different thicknesses. For the manufacturability by means of laser transmission welding is crucial that at least one of the two textile layers A or A 'is transparent to laser light, so that the layers to be welded are accessible at all.
Eine weitere Aufgabe der Erfindung ist darin zu sehen, ein verbessertes Schlafsystem anzugeben. Diese weitere Aufgabe wird durch das im Anspruch 10 definierte Schlafsystem gelöst, welches mindestens einen erfindungsgemässen Luftkern sowie eine mit dem verschliessbaren Ventil der Luftkammer verbindbare Druckreglervorrichtung gelöst. Ein solches Schlafsystem kann auch mehrere Luftkerne umfassen, wobei deren Innendruck bzw. Härte zweckmässigerweise unabhängig regelbar sind. Ein derartiges Mehrkammersystem ist an sich aus der
Gemäss noch einer weiteren Aufgabe der Erfindung wird gemäss Anspruch 11 ein Verfahren zur Herstellung eines erfindungsgemässen Luftkerns angegeben, welches zumindest die folgenden Verfahrensschritte umfasst:
- a) Bereitstellen eines mit schaltbaren Ansaugmitteln und einer Ausnehmung für das Ventil ausgestatteten Auflagetisches;
- b) Auflegen einer ersten Bahn, gebildet durch eine erste der wasserdampfdurchlässigen Textillagen (A) und, darüberliegend, einer ersten der luftdichten, wasserdampfdurchlässigen Membranlagen (B) und darüber liegender Laserlicht absorbierenden Schicht (C);
- c) Einschalten der Ansaugmittel zur Fixierung der ersten Bahn;
- c) Ausstanzen der aufgelegten Bahn über der Ausnehmung und Einlegen eines Ventils in die Ausnehmung, wobei ein Kragenbereich des Ventils über die aufgelegte Bahn zu liegen kommt;
- d) Anschweissen des Ventils an die aufgelegte Bahn indem fokussiertes Laserlicht durch den Kragenbereich hindurch auf die absorbierende Schicht (C) fokussiert und unter gleichzeitiger Anwendung eines Auflagedrucks entlang des Umfangs des Kragenbereichs verschoben wird, wobei eine umlaufende Dichtungszone zwischen dem Ventil und der aufgelegten Bahn gebildet wird;
- e) Auflegen einer zweiten Bahn, gebildet durch eine zweite der luftdichten, wasserdampfdurchlässigen Membranlagen (B') und, darüberliegend, einer zweiten der wasserdampfdurchlässigen Textillagen (A'), wodurch ein Lagenstapel (A', B', B, A bzw. A', B', C, B, A) gebildet wird;
- f) Auflegen einer für Laserlicht transparenten vakuumdichten Haltefolie (D) über den Lagenstapel und Fixieren desselben durch Vorspannen der Haltefolie gegen den Auflagetisch;
- g) Bilden einer umlaufenden Fügezone indem Laserlicht auf die absorbierende Schicht fokussiert und unter gleichzeitiger Anwendung eines Auflagedrucks entlang einer entsprechenden Fügelinie geführt wird.
- a) providing a provided with switchable suction means and a recess for the valve support table;
- b) applying a first web, formed by a first of the water vapor permeable fabric layers (A) and, lying over, a first of the airtight, water vapor permeable membrane layers (B) and overlying laser light absorbing layer (C);
- c) switching on the suction means for fixing the first web;
- c) punching the laid web over the recess and inserting a valve into the recess, wherein a collar portion of the valve comes to rest over the laid-up web;
- d) welding the valve to the applied web by focused laser light focused on the absorbent layer (C) through the collar portion and displaced along the circumference of the collar portion while applying a bearing pressure, forming a peripheral sealing zone between the valve and the laid-up web;
- e) applying a second web, formed by a second of the airtight, water vapor permeable membrane layers (B ') and, lying over, a second of the water vapor permeable textile layers (A'), whereby a layer stack (A ', B', B, A or A ', B', C, B, A) is formed;
- f) placing a transparent laser-transparent vacuum-tight retaining film (D) over the layer stack and fixing it by biasing the retaining film against the support table;
- g) forming a circumferential joining zone by laser light focused on the absorbent layer and is guided along a corresponding joint line with the simultaneous application of a contact pressure.
Für die erforderliche Dichtigkeit der Luftkammer ist insbesondere die Qualität der Verschweissung der luftdichten, wasserdampfdurchlässigen Membranlagen (B) und (B') einschliesslich der dazwischen liegenden absorbierenden Schicht (C) entscheidend. Die Schweissverbindung mit den Textillagen (A) und (A') ist hingegen für den Zusammenhalt und die mechanische Belastbarkeit der Luftkammer wichtig.In particular, the quality of the welding of the airtight, water vapor permeable membrane layers (B) and (B '), including the intermediate absorbent layer (C), is decisive for the required tightness of the air chamber. The welded connection with the fabric layers (A) and (A '), however, is important for the cohesion and mechanical strength of the air chamber.
Vorteilhafte Ausgestaltungen der Erfindung sind nachfolgend beschrieben und in den abhängigen Ansprüchen definiert.Advantageous embodiments of the invention are described below and defined in the dependent claims.
Grundsätzlich sind die Abmessungen des Luftkerns keinen besonderen Einschränkungen unterworfen und können demnach entsprechend dem gewünschten Verwendungszweck gewählt werden. Für den Einbau in ein Schlafsystem sind die Abmessungen des Luftkerns insbesondere entsprechend der Grösse der Liegefläche und der Anzahl der darin verbauten Luftkerne zu wählen.Basically, the dimensions of the air core are not subject to any particular restrictions and can therefore be selected according to the desired purpose. For installation in a sleep system, the dimensions of the air core must be selected in particular according to the size of the lying surface and the number of air cores installed therein.
Vorteilhafterweise (Anspruch 2) weist jede der inneren Membranlagen (B, B') eine Dicke von 10 bis 50 µm, vorzugsweise von 20 bis 40 µm auf. Gemäss einer vorteilhaften Ausgestaltung (Anspruch 3) sind die inneren Membranlagen (B, B') aus einem Polyetherester gebildet. Geeignete Materialien in Form dünner Folienbahnen sind im Handel erhältlich, beispielsweise unter der Bezeichnung Sympatex™ von der Firma Sympatex Technologies GmbH in Unterfohring (D).Advantageously (claim 2), each of the inner membrane layers (B, B ') has a thickness of 10 to 50 microns, preferably from 20 to 40 microns. According to an advantageous embodiment (claim 3), the inner membrane layers (B, B ') are formed from a polyether ester. Suitable materials in the form of thin film webs are commercially available, for example under the name Sympatex ™ from the company Sympatex Technologies GmbH in Unterfohring (D).
Besonders bevorzugt (Anspruch 4) ist es, wenn zumindest eine der inneren Membranlagen einen nach ISO 11092 gemessenen Wasserdampfdurchgangswiderstand Ret von höchstens 20 m2Pa/W aufweist. Zweckmässigerweise handelt es sich dabei um diejenige innere Membranlage, die sich auf der vom Ventil abgewandten Seite befindet und beim Einbau in ein Schlafsystem auf der zur Person zugewandten Seite zu liegen kommt.It is particularly preferred (claim 4), if at least one of the inner membrane layers has a measured according to ISO 11092 water vapor resistance Ret of at most 20 m 2 Pa / W. Expediently, this is the inner membrane layer which is located on the side facing away from the valve and, when installed in a sleep system, comes to rest on the side facing the person.
Für die Herstellung des erfindungsgemässen Luftkerns mittels Laserdurchstrahlschweissen ist es erforderlich, dass sich zwischen den zu verschmelzenden Bahnen, also zwischen den beiden inneren Membranlagen (B, B') eine Laserlicht absorbierende Mittelschicht (C) befindet. Unter Einwirkung von entsprechend fokussiertem Laserlicht wird die Mittelschicht C über den Schmelzpunkt des thermoplastischen Polymers erhitzt, sodass unter Einwirkung eines mechanischen Andruckes die gewünschte Fügezone, d.h. eine luftdichte Schweissnaht ausbildet.For the production of the air core according to the invention by means of laser transmission welding, it is necessary for a middle layer (C) absorbing laser light to be present between the sheets to be fused, that is to say between the two inner membrane layers (B, B '). Under the action of appropriately focused laser light, the middle layer C is heated above the melting point of the thermoplastic polymer, so that under the action of a mechanical pressure, the desired joining zone, i. forms an air-tight weld.
Gemäss einer ersten Ausgestaltung (Anspruch 5) ist die Mittelschicht (C) als lichtabsorbierende Beschichtung zumindest einer der inneren Membranlagen (B, B') ausgebildet. Als Beschichtungsmaterial kann beispielsweise Russ aufgetragen werden. Alternativ können auch handelsübliche Beschichtungsmittel wie beispielsweise Clearweld ™ von der Firma Crysta-Lyn Chemical Company, Binghamton, NY (USA) eingesetzt werden. Derartige Beschichtungen haben vorzugsweise eine Schichtdicke von 0.5 bis 1 µm.According to a first embodiment (claim 5), the middle layer (C) is formed as a light-absorbing coating of at least one of the inner membrane layers (B, B '). For example, carbon black can be applied as the coating material. Alternatively, commercially available coating agents such as Clearweld ™ from Crysta-Lyn Chemical Company, Binghamton, NY (USA) may also be used. Such coatings preferably have a layer thickness of 0.5 to 1 .mu.m.
Gemäss einer weiteren Ausgestaltung (Anspruch 6) ist die Mittelschicht (C) als eine weitere Membranlage aus einem Laserlicht absorbierenden thermoplastischen Polymer mit einer Dicke von 1 bis 50 µm, vorzugsweise 10 bis 40 µm, und noch bevorzugter von 10 bis 20 µm, ausgebildet. Hierfür geeignet ist insbesondere eine schwarze Membrane aus einem Polyetherester, welche beispielsweise unter dem Handelsnamen Sympatex Standard Black von der Firma Sympatex Technologies GmbH erhältlich ist. Vorteilhaft ist es zudem (Anspruch 7), wenn die weitere Membranlage (C) einen Wasserdampfdurchgangswiderstand Ret von höchstens 20 m2Pa/W aufweist.According to a further embodiment (claim 6), the middle layer (C) as another membrane layer of a laser light absorbing thermoplastic polymer having a thickness of 1 to 50 microns, preferably 10 to 40 microns, and more preferably from 10 to 20 microns formed. Particularly suitable for this purpose is a black membrane made of a polyether ester, which is available, for example, under the trade name Sympatex Standard Black from the company Sympatex Technologies GmbH. It is also advantageous (claim 7) if the further membrane layer (C) has a water vapor transmission resistance Ret of at most 20 m 2 Pa / W.
Insbesondere für den Einsatz des Luftkerns in einem Schlafsystem ist es vorteilhaft, dass die Luftkammer eine Luftdichtigkeit nach EN/ISO 9237 von besser als 0.02 Lm-2s-1 bei einer Druckdifferenz von 2 mbar aufweist. Damit wird ein allzu häufiges Nachfüllen von Druckluft über die Druckreglervorrichtung vermieden.In particular, for the use of the air core in a sleep system, it is advantageous that the air chamber has airtightness according to EN / ISO 9237 of better than 0.02 Lm -2 s -1 at a pressure difference of 2 mbar. This avoids too frequent refilling of compressed air via the pressure regulator device.
Für den Komfort ist es zudem von Vorteil (Anspruch 9), wenn die umlaufende Fügezone eine Breite von höchstens 2 mm, vorzugsweise von 0.2 bis 1 mm aufweist. Damit wird eine möglicherweise als störend empfundene Steifigkeit des Luftkerns vermieden.For comfort, it is also advantageous (claim 9), if the circumferential joining zone has a width of at most 2 mm, preferably from 0.2 to 1 mm. This avoids a potentially annoying stiffness of the air core.
Zur Durchführung des erfindungsgemässen Verfahrens wird vorzugsweise ein Diodenlaser mit einer Wellenlänge im Bereich von 0.9 bis 1.1 µm eingesetzt (Anspruch 12). In diesem Spektralbereich gibt es für das Laserdurchstrahlschweissen geeignete transparente wie auch lichtabsorbierende thermoplastische Polymere.To carry out the method according to the invention, a diode laser with a wavelength in the range from 0.9 to 1.1 μm is preferably used (claim 12). In this spectral range, there are transparent as well as light-absorbing thermoplastic polymers suitable for laser transmission welding.
Vorteilhafterweise wird der Auflagedruck mittels einer für das Laserlicht transparenten, vorzugsweise luftgelagerten Kugel angewendet (Anspruch 13). Er beträgt typischerweise ungefähr 0.5 bis 1.5 bar, vorzugsweise ungefähr 0.9 bis 1.1 bar. Entsprechende Schweissvorrichtungen sind grundsätzlich bekannt. Dabei wird ein Laserstrahl über eine luftgelagerte, nahezu reibungsfrei drehbare Glaskugel auf die Fügezone fokussiert. Die Glaskugel wirkt dabei einerseits als optisches Element zur Fokussierung des Laserstrahls und dient andererseits auch als mechanisches Andrückmittel. Während die Kugel auf der Fügezone abrollt, wird permanent und punktuell ein Auflagedruck ausgeübt. Mit einer derartigen Anordnung wird die thermische Energie des Lasers nur dort eingebracht, wo ein Auflagedruck anliegt.Advantageously, the contact pressure is applied by means of a transparent to the laser light, preferably air-bearing ball (claim 13). It is typically about 0.5 to 1.5 bar, preferably about 0.9 to 1.1 bar. Corresponding welding devices are known in principle. A laser beam is focused on the joining zone via an air-bearing, almost friction-free rotatable glass ball. The glass ball acts on the one hand as an optical element for focusing the laser beam and on the other hand serves as a mechanical Pressure means. While the ball rolls on the joining zone, a permanent and punctual contact pressure is exerted. With such an arrangement, the thermal energy of the laser is introduced only where a contact pressure is applied.
Als Haltefolie (D) zum Fixieren des Lagenstapels wird vorzugsweise eine Folie aus Polyethylen (PE) mit einer Dicke von 150 bis 400 µm verwendet, welche sich durch gute Elastizität und Stabilität auszeichnet und für Strahlung im Bereich von 0.9 bis 1.1 µm eine gute Transparenz aufweist. Als weitere Möglichkeit kann eine Folie aus Polytetrafluoroethylen (PTFE) mit einer Dicke von 100 bis 300 µm eingesetzt werden.As a holding film (D) for fixing the ply stack, a film of polyethylene (PE) with a thickness of 150 to 400 microns is preferably used, which is characterized by good elasticity and stability and has good transparency for radiation in the range of 0.9 to 1.1 microns , As a further possibility, a film of polytetrafluoroethylene (PTFE) having a thickness of 100 to 300 microns can be used.
Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnungen näher beschrieben, dabei zeigen:
- Fig. 1
- einen Ausschnitt des Schichtenaufbaus einer ersten Ausgestaltung des erfindungsgemässen Luftkerns;
- Fig. 2
- einen Ausschnitt des Schichtenaufbaus einer zweiten Ausgestaltung des erfindungsgemässen Luftkerns;
- Fig. 3
- einen weiteren Ausschnitt des Schichtenaufbaus der
Fig. 2 mit angeschweisstem Ventil; und - Fig. 4
bis 6 - einzelne Schritte bei der Herstellung einer Luftkammer.
- Fig. 1
- a section of the layer structure of a first embodiment of the inventive air core;
- Fig. 2
- a section of the layer structure of a second embodiment of the inventive air core;
- Fig. 3
- another section of the layer structure of
Fig. 2 with welded valve; and - 4 to 6
- individual steps in the manufacture of an air chamber.
Aus Gründen der Anschaulichkeit sind die
Der in der
Bei dem in der
Die
Ein Weg zur Herstellung eines Luftkerns ist in den
Es wird zunächst ein mit nicht näher dargestellten Ansaugmitteln ausgestatteter Auflagetisch, auch als "Vakuumtisch" bezeichnet, bereitgestellt. Im gezeigten Beispiel umfasst der Auflagetisch eine mit Durchgangslöchern 20 versehene Tischplatte 22 und eine darauf liegende Auflageplatte 24, welche vorteilhafterweise aus Aluminium besteht. Die Auflageplatte 24 ist mit einer mittigen Ausnehmung 26 versehen.It is first provided with a suction means not shown support table, also referred to as "vacuum table" provided. In the example shown, the support table comprises a
Danach wird gemäss
In der Folge wird wie in der
Schliesslich wird entsprechend der
Luftkerne verschiedener Abmessungen wurden mit dem oben beschriebenen Verfahren hergestellt, wobei für das Laserdurchstrahlschweissen eine Vorrichtung mit luftgelagerte Kugeloptik "GloboOptik" der Leister Technologies AG, Kägiswil, Schweiz eingesetzt wurde. Als Laserquelle diente eine Laserdiode mit einer Emissionswellenlänge von 940 nm. Die Optik wurde auf einen X-Y-Vakuumtisch montiert, der ein Verschieben der Lagen während des Schweissens verhindert. Damit lassen sich sämtliche Fügelinien realisieren, die mit einem CAD-Schnittprogramm in zweidimensionaler Fläche zeichenbar sind. Insbesondere lassen sich damit umlaufende Fügelinien in Kreis- oder Rechteckform ansteuern. Die Verfahrensparameter müssen je nach Dicke und den optischen sowie thermischen Eigenschaften der verwendeten Materialien gewählt werden. Es muss also ggf. in Vorversuchen die minimale Laserenergie ermittelt werden, mit der die Lagen miteinander verschmelzen und die gewünschten Festigkeiten haben, aber keine thermischen Schäden erfahren.Air cores of various dimensions were produced by the method described above, using a device with airborne spherical optics "GloboOptik" from Leister Technologies AG, Kägiswil, Switzerland, for laser transmission welding. The laser source was a laser diode with an emission wavelength of 940 nm. The optics were mounted on an XY vacuum table, which prevents shifting of the layers during welding. Thus, all joint lines can be realized, which can be identified with a CAD editing program in a two-dimensional surface. In particular, it can be used to control circumferential joint lines in a circular or rectangular shape. The process parameters must be selected according to the thickness and the optical and thermal properties of the materials used. It may therefore be necessary in preliminary experiments to determine the minimum laser energy with which the layers fuse together and have the desired strengths, but undergo no thermal damage.
Ein Lagenstapel der Grösse 40 x 60 cm folgen aufgelisteter Materialien wurde in obiger Art zu einem Luftkern verarbeitet.
- A'
- thermoplastischer Polyester (Gewebe), 140 g/m2
- B'
- Polyetherester (Sympatex), Dicke 15 µm
- C
- Polyetherester (Sympatex Standard Black) 15 µm
- B
- Polyetherester (Sympatex), Dicke 15 µm
- A
- thermoplastischer Polyester (Gewebe), 140 g/m2
- D
- (Vakuumfolie) Polyethylen 300 µm
- A '
- thermoplastic polyester (fabric), 140 g / m 2
- B '
- Polyetherester (Sympatex), thickness 15 μm
- C
- Polyetherester (Sympatex Standard Black) 15 μm
- B
- Polyetherester (Sympatex), thickness 15 μm
- A
- thermoplastic polyester (fabric), 140 g / m 2
- D
- (Vacuum foil) polyethylene 300 μm
Die gemessene Luftdichtigkeit nach EN/ISO 9237 bei einer Druckdifferenz von 2 mbar war besser als 0.02 Lm-2s-1 .The measured airtightness according to EN / ISO 9237 at a pressure difference of 2 mbar was better than 0.02 Lm -2 s -1 .
Claims (13)
- An air core (2), particularly for a mattress or cushion, comprising at least one air chamber (4) with an airtight, water vapor permeable skin, which is formed by sheets that are welded to each other in a circumferential joining zone (8), wherein the air chamber is provided with a closable valve (14) for introducing and discharging of air, which valve is welded into one of the sheets, characterized in that each one of the sheets comprises at least one water vapor-permeable outer textile layer (A, A') and one airtight, water vapor-permeable inner membrane layer (B, B'), wherein each one the inner membrane layers has a thickness of 1 to 100 µm, wherein the inner membrane layers and the outer textile layers are made of weldingly compatible thermoplastic polyesters and are cohesively welded to each other in the joining zone by the action of laser light and the application of pressure, wherein the inner membrane layers and at least one of the outer textile layers and a collar region (16) of the valve are transparent for laser light, and wherein there is a laser light absorbing middle layer (C) which is located between the sheets at least in the region of the joining zone (8) and the valve (14).
- The air core according to claim 1, wherein each one of the inner membrane layers (B, B') has a thickness of 10 to 50 µm, preferably of 20 to 40 µm.
- The air core according to claim 1 or 2, wherein each one of the inner membrane layers (B, B') is made of a polyester.
- The air core according to one of claims 1 to 3, wherein at least one of the inner membrane layers (B, B') has a water vapor transmission resistance Ret of maximally 20 m2Pa/W.
- The air core according to one of claims 1 to 4, wherein the middle layer (C) is formed as a light absorbing coating of at least one of the inner membrane layers (B, B').
- The air core according to one of claims 1 to 4, wherein the middle layer (C) is formed as a further membrane layer made of a laser light absorbing thermoplastic polyester having a thickness of 1 to 50 µm, preferably of 10 to 20 µm, which is weldingly compatible with the inner membrane layers.
- The air core according to claim 6, wherein the further membrane layer (C) has a water vapor transmission resistance Ret of maximally 20 m2Pa/W.
- The air core according to one of claims 1 to 7, wherein the air chamber has an air tightness according to EN/ISO 9237 of better than 0.02 Lm-2s-1 at a pressure difference of 2 mbar.
- The air core according to one of claims 1 to 8, wherein the circumferential joining zone has a width of maximally 2 mm, preferably of 0.2 to 1 mm.
- A sleeping system comprising at least one air core according to one of the preceding claims and a pressure regulator device that is connectable to the closable valve of the air chamber.
- A method for producing an air core according to one of claims 1 to 9, comprising the following steps:a) providing a support table (22, 24) that is equipped with switchable suction means (20) and a recess (26) for the valve;b) applying of a first sheet that is constituted by a first one of the two water vapor-permeable textile layers (A) and, on top thereof, by a first one of the airtight, water vapor permeable membrane layers (B) and, on top thereof, by the laser light absorbing layer (C);c) switching on the suction means for fixing the first sheet;c) punching out the overlying sheet above the recess and inserting a valve (14) into the recess, so that a collar region (16) of the valve comes to lie over the applied sheet;d) welding the valve to the applied sheet by focusing focused laser light (L) through the collar region onto the laser light absorbing layer (C) and by displacing it along the circumference of the collar region while simultaneously applying a contact pressure (P), thereby forming a circumferential sealing zone (18) between the valve (14) and the applied sheet;e) applying of a second sheet that is constituted by a second one of the airtight, water vapor permeable membrane layers (B') and, on top thereof, by a second one of the water vapor permeable textile layers (A'), thereby forming a layer stack (A', B', B, A or A', B', C, B, A, respectively);f) applying of a vacuum tight adhesion foil (D) that is transparent for laser light over the layer stack and fixing it by tensioning the adhesion foil against the support table;g) forming of a circumferential joining zone (8) by focusing laser light (L) onto the absorbing layer and by displacing it along a respective joint line while simultaneously applying a contact pressure (P).
- The method according to claim 11, wherein the laser light has a wavelength of 0.9 to 1.1 µm.
- The method according to claim 11 or 12, wherein the contact pressure is applied by means of a ball, preferably an airborne ball, that is transparent for laser light.
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EP15189607.3A EP3155933B1 (en) | 2015-10-13 | 2015-10-13 | Air core, in particular for a mattress or cushion, and method for producing the same |
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EP15189607.3A EP3155933B1 (en) | 2015-10-13 | 2015-10-13 | Air core, in particular for a mattress or cushion, and method for producing the same |
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CH687905A5 (en) | 1992-05-06 | 1997-03-27 | Airlux Ag | Air supply device for a mattress or cushion with an air chamber. |
EP0992206B1 (en) | 1998-10-05 | 2003-04-16 | Aqua Dynamic AG | Air pump and air bed system with a plurality of independent air chambers |
DE20112764U1 (en) | 2001-08-08 | 2001-10-31 | Brun Andreas | air mattress |
EP2810772A1 (en) | 2013-06-07 | 2014-12-10 | Leister Technologies AG | Water vapour-permeable waterproof textile laminate and method for producing the same |
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