Seam structure, connecting structure, method for separating a seam structure, use of a pressure boiling device for separating a seam structure

Abstract

NOT VISIBLE DUE TO STATUS OF PATENT

Description

[0001] Seam structure, joining structure, method for separating a seam structure, use of a pressure cooking device for separating a seam structure

[0002] Field of the invention

[0003] The present invention relates to a seam structure, a connecting structure, a method for separating a seam structure and a use of a pressure cooking device for separating a seam structure.

[0004] Background of the invention

[0005] In the prior art, for example, from JP H 0 881 811 A, a seam is known that comprises a water-soluble yarn. This allows individual textile sections connected by the seam to be separated from each other, with the textile sections themselves consisting of an insoluble material. A temperature for dissolving the seam can be, for example, 70°C.

[0006] However, such yarns may not meet certain requirements during use. For example, such yarns may unravel during the washing of a textile or may even lose their stiffness / strength before unraveling. The costs of meeting certain requirements with such conventional yarns can quickly rise.

[0007] The task is therefore to provide a seam structure that can reliably separate a textile structure and at the same time meet high technical requirements.

[0008] Summary of the invention

[0009] This object is achieved according to the invention by a seam structure according to claim 1.

[0010] According to a first aspect disclosed herein, a seam structure is provided comprising: a first yarn having a destructible portion; and a second yarn forming a seam together with the first yarn and made of a material different from a material of the destructible portion. At least the destructible portion is destructible by pressure cooking, wherein at least the destructible portion is made of a material that is resistant to water at a temperature below 100°C and destructible by pressure cooking in water or in an aqueous solution at a temperature above 100°C. According to the first aspect, the first yarn has the destructible portion that is destructible by pressure cooking. Thus, the first yarn can also withstand high temperatures during washing, for example, between 30°C and 75°C, and have a required stiffness / strength.Furthermore, the first yarn with the destructible section is only partially used in the seam structure alongside the second yarn. Thus, technical, tactile, and / or optical requirements can be achieved via the second yarn, in particular via the choice of the material of the second yarn, which is different from one, in particular every, material of the destructible section. Furthermore, the only partial use of the first yarn with the destructible section can increase cost efficiency. Pressure cooking can be easily implemented, which in turn can promote cost efficiency when separating the seam structure.

[0011] The present invention is particularly suitable for separating the seam structure by type. A pure separation can be assumed in terms of material if a material or a material mixture can be further processed in a recycling process, whereby different materials or material mixtures can result in different recycling processes. A recycling process can be carried out chemically and / or mechanically and / or thermally. The present invention has the advantageous effect that the high temperatures used to separate the seam structure simultaneously result in the sterilization of the remaining material.

[0012] In other words, a hybrid seam structure is created that comprises at least two yarns, the first of which is at least partially destructible by pressure cooking.

[0013] For the definition, it should be noted that pressure cooking in this disclosure refers to the introduction of the seam structure into a fluid, in particular a liquid, furthermore in particular water, wherein the fluid has a temperature of at least 100°C, in particular more than 100°C. Furthermore, the pressure is above atmospheric pressure. The destructible section in particular dissolves, i.e., is chemically destroyed. The fluid can in particular be pure water or an aqueous solution, i.e., water with a chemical additive, such as an acid and / or base. The chemical additive can be, for example, NaOH.

[0014] The temperature of the fluid can, for example, be at least or more than 100°C and less than or equal to 150°C. Further limit values ​​can be 110°C, 120°C, 130°C, and 140°C, whereby each of these limit values ​​can be a lower or upper limit, which can be included or excluded. Thus, all sub-ranges formed from any combination of these limit values ​​are also explicitly disclosed. The destructible section is only destroyed at or above the respective lower limit.

[0015] With regard to pressure, the pressure can be greater than 1 bar and less than 10 bar, for example. Further limit values ​​can be 2 bar, 3 bar, 4 bar, 5 bar, 6 bar, 7 bar, 8 bar, and 9 bar, whereby each of these limit values ​​can be a lower or upper limit, which can be included or excluded. Thus, all sub-ranges formed from any combination of these limit values ​​are also explicitly disclosed.

[0016] In order to realize pressure cooking of a seam structure according to the invention, it is possible to use mechanical pressure cooking devices known per se which were previously designed for another application for the treatment of textiles, for example high-pressure dyeing machines known per se which were designed to dye textiles by means of a liquid containing dyes and for this purpose enable treatment of the textiles to be dyed in a pressurized liquid which has been brought to a boil.

[0017] A seam structure refers herein to a seam comprising at least two yarns that cross each other at at least one location, in particular at a plurality of locations. The seam structure can generally be referred to as textile joining by sewing thread-stitch crossing. In other words, the seam structure refers to a multi-thread (yarn) seam, as disclosed, for example, in ISO 4915 and DIN 61400. Each of the seam structures disclosed therein with at least two yarns can be geometrically considered the seam structure of the invention. The seam structures disclosed therein are incorporated herein by reference.

[0018] In the seam structure, the first yarn can cross under, over, or alternately under and over the second yarn.

[0019] Of course, the seam structure can also have more than two yarns.

[0020] In the seam structure, the destructible section can be present at least in the area of ​​a crossing point of the yarns, in particular at each crossing point. This allows the crossing to be eliminated. Then, in a subsequent step, the remaining portion of the first yarn and the second yarn can be easily separated from each other, for example, by mechanical processing, so that the seam structure can be completely separated. However, in particular, the entire first yarn is formed as the destructible section. This allows the seam structure to be separated particularly easily, without the need for further processing.

[0021] According to the first aspect, the second yarn may not be destructible by pressure cooking. This allows the second yarn to remain substantially unchanged even after the seam structure is severed. The second yarn can thus be reused or recycled. The second yarn may be destructible by means other than pressure cooking.

[0022] Furthermore, the second yarn may be destructible by pressure cooking under different conditions than the destructible section.

[0023] This also allows the second yarn to be reused after pressure cooking and thus after the seam structure has been severed. The other conditions may include, for example, a different, particularly higher, temperature, a different, particularly higher, pressure, and / or a different fluid for pressure cooking compared to the conditions under which the destructible section is destroyed.

[0024] Furthermore, the second yarn may have a higher stiffness and / or strength than the destructible section.

[0025] This allows the second yarn to ensure that certain technical requirements, such as stiffness and / or strength, are met for the seam structure, even if the first yarn is at least partially destructible by pressure cooking. For example, the second yarn can be made of a material with a higher tensile strength and / or a higher modulus of elasticity than the destructible section. The second yarn can also have a larger cross-sectional area than the maximum cross-sectional area of ​​the destructible section or the entire first yarn.

[0026] The second yarn in the seam structure can be the yarn that bears the majority of the load. In particular, the second yarn can be a needle thread, while the first yarn can be, for example, a bobbin or looper thread.

[0027] Furthermore, the second yarn can be surface-treated at least in sections, in particular bleached and / or dyed.

[0028] This also makes it possible for the second yarn to ensure that certain visual and / or tactile requirements are met, and also to reliably separate the seam structure. The surface treatment can be a surface treatment other than mechanical processing. In particular, a desired color can be achieved by bleaching, for example by means of bleaching, and / or dyeing. However, the surface treatment can also include the application of a heat-insulating or fluid-repellent layer to the second yarn. This allows the second yarn to be protected during pressure cooking. The destructible section can, in particular, be unbleached and / or undyed, at least in sections.

[0029] This allows for reliable destruction of the destructible section and cost-efficient production of the first yarn. The first yarn can be dyed or completely unbleached and / or undyed.

[0030] Furthermore, the destructible section may comprise polyvinyl alcohol, in particular be formed therefrom.

[0031] Polyvinyl alcohol can be reliably destroyed / dissolved by pressure cooking. In particular, polyvinyl alcohol with a high degree of hydrolysis and polymerization can be used for the destructible section. A high degree of hydrolysis can be present, in particular, from 70%, then from 80%, then again from 90%, and finally from 95%. A high degree of polymerization can be present, in particular, from 1000, then from 1500, then again from 2000, and finally from 2500. The limits of the degree of hydrolysis and degree of polymerization can be combined arbitrarily, and each combination explicitly counts as part of the invention. According to the invention, the polyvinyl alcohol cannot be destroyed at atmospheric pressure and below the boiling point of 100°C.

[0032] Alternatively or additionally, the destructible section can comprise synthetic fibers or be formed from synthetic fibers that can be destructed by a chemical. For example, acetate can be dissolved with the solvent acetone, and PVC can also be dissolved with acetone, or with diethyl ether, chloroform, or hydrochloric acid (and others). However, the resulting decomposition products are very difficult to process afterward—keyword: "regenerable process fluid." Therefore, synthetic fibers are advantageously modified for destructibility, e.g., modified polyethylene terephthalate with reduced alkali resistance (available, for example, from BYR International under the product names AXTRE® or SOLUCELL®).

[0033] Appropriately modified polyethylene terephthalate can be reliably destroyed / dissolved by pressure cooking. With modified polyethylene terephthalate, the individual components are chemically dissolved by pressure cooking in an alkali solution (by adding sodium hydroxide to the fluid). The resulting components (glycols / monomers) are inorganic carbon compounds (so-called "degradable inorganic carbons"), which are readily degradable by biological systems when the process water solution is returned to the neutral pH range using sulfuric acid. These compounds, especially in the form of salts, are then readily degradable by biological systems. Thus, with stoichiometrically correct ratios, pressure cooking massively promotes almost complete dissolution, with simultaneously high process reliability and in a very short time.According to the invention, the modified polyethylene terephthalate cannot be destroyed in water at atmospheric pressure and below the boiling point of 100°C.

[0034] The destructible portion may comprise a variety of different materials, particularly those that are destructible at different temperatures and / or pressures. In particular, the destructible portion may comprise polyvinyl alcohol and modified polyethylene terephthalate.

[0035] This allows for a suitable combination of materials for the destructible section to be provided for the specific application. This also allows for improved properties to be achieved for the first yarn. The combination of the two materials can be intimate, i.e., within a single fiber of the first yarn. However, it is also possible to form at least one fiber with one material and at least one other fiber with the other material.

[0036] According to a second aspect, a connecting structure is provided, comprising: a surface portion; a coupling element; and the seam structure according to at least one of the preceding aspects, wherein the surface portion and the coupling element are coupled via the seam structure.

[0037] This allows for the provision of a connecting structure, in particular a textile connecting structure, that exhibits the above-mentioned effects. The surface section can be a textile surface section, for example, made of fabric or leather. The coupling element can also be a surface section, in particular a textile surface section, or can be, for example, a button.

[0038] The connecting structure is also suitable for pure separation. In particular, the surface section, the coupling element, and the second yarn can each be recycled after separation.

[0039] In the connecting structure, the second yarn can be exposed at least in sections towards an outer side of the connecting structure.

[0040] Since the second yarn can be designed according to specific requirements, it is advantageous for the second yarn to be visible. This can be particularly helpful if the second yarn has a surface treatment. The outer side is an easily identifiable side in textile connecting structures and can, for example, be a functional side.

[0041] Furthermore, the surface element and / or the coupling element can be formed, at least in sections, from the material of the second yarn. This is advantageous with regard to recycling. In particular, such a connecting structure is predestined for pure separation. The second yarn can remain in the surface section and / or coupling element and, if necessary, be recycled with the surface section and / or coupling element.

[0042] According to a third aspect, a method for separating a seam structure or the connecting structure according to at least one of the above aspects is provided. The method comprises: - pressure-cooking the seam structure, whereby the destructible portion of the first yarn is destroyed.

[0043] In this way, the weld structure can be reliably separated. The above-mentioned conditions apply to pressure cooking, particularly with regard to temperature and pressure.

[0044] Pressure cooking can take place in a sealed container containing the weld or joining structure. The container can be pressurized with the fluid inside.

[0045] The fluid used for pressure cooking (e.g., water or an aqueous solution) can be moved relative to the weld structure during pressure cooking. This movement of the fluid relative to the weld structure accelerates the destruction of the material forming the destructible section and promotes the removal of the destroyed destructible sections from the weld structure, thus enabling a particularly efficient separation of the weld structure.

[0046] Pressure cooking may include flushing the weld structure with a fluid.

[0047] Flushing here refers to the supply and removal of fluid during pressure cooking and the separation of the weld structure. In other words, the weld structure or joint is not immersed in a static fluid. This allows the dissolved, destructible section to be removed.

[0048] A variety of weld structures can be pressure cooked that have the same destructible section in terms of material.

[0049] This allows several seam structures to be separated simultaneously in a pressure cooking process, whereby the destroyed destructible sections are homogeneous and can therefore be collected or recycled together.

[0050] Furthermore, at least the second yarn can be supported during pressure cooking.

[0051] Since the destructible section is destroyed during pressure cooking, tangling of the second yarn can be avoided. However, the connecting structure can be supported as a whole. The seam structure or connecting structure can, in particular, be supported over the entire length of the seam structure. Supporting particularly includes supporting both sides, and again, in particular, clamping the seam structure or connecting structure.

[0052] Supporting can be achieved by a permeable support device into which the fluid can flow. A wide-mesh textile bag or a perforated metal container can serve as the support device. The support device can be designed to stretch the seam structure or the connecting structure. This ensures that the entire destructible section or the entire first yarn is destroyed, as it can be completely wetted with fluid.

[0053] According to a fourth aspect, the use of a pressure cooking device as a separating device for separating a seam structure or a connecting structure according to at least one of the above aspects is provided, which pressure cooking device comprises: - a container for receiving a fluid; - a fluid conveying device designed to move the fluid inside the container; and - a heating device designed to heat the fluid; and - a permeable supporting device designed to receive a seam structure or a connecting structure according to at least one of the above aspects and arranged in the container.

[0054] This device allows a seam structure or a connecting structure according to the invention to be reliably separated. The fluid conveying device can comprise, for example, a pump. The heating device can comprise, for example, a heating band and / or a fan. Examples of the support device have already been given above.

[0055] The separating device can have the seam structure or the connecting structure arranged in the support device.

[0056] Brief description of the drawings

[0057] The invention is described in detail below with reference to the drawings.

[0058] Fig. 1 shows a connecting structure according to the invention in section.

[0059] Fig. 2 shows a preparation step for pressure cooking.

[0060] Fig. 3 shows a state in which a connecting structure is pressure-cooked. Detailed Description of Exemplary Embodiments

[0061] The same reference numerals are used for the same elements in the figures unless otherwise stated.

[0062] Fig. 1 shows a longitudinal section of a connecting structure 100 according to the invention. The connecting structure 100 is a textile connecting structure. It comprises a first textile surface section 101 (surface section as defined by the claims) and a second textile surface section 102 (coupling element as defined by the claims). The first surface section 101 is arranged above the second surface section 102, and they overlap each other in a thickness direction of the surface sections. Both surface sections can be made of fabric or leather, or one can be made of fabric and the other of leather.

[0063] The connecting structure 100 further comprises a seam structure 103. The seam structure 103 couples the first surface section 101 and the surface section 102 to each other, thereby securing them together. The seam structure 103 extends in a longitudinal direction perpendicular to the thickness direction.

[0064] The seam structure 103 includes a first yarn 103a and a second yarn 103b, each extending longitudinally and having alternating peaks and valleys in the longitudinal direction. Several peaks of the first yarn 103a each cross a corresponding valley of the second yarn 103b at corresponding intersection points.

[0065] The first yarn 103a and the second yarn 103b form a seam. In this case, a lockstitch is formed as the seam, which can be produced, for example, with a sewing machine. The first yarn 103a can be a bobbin thread, and the second yarn 103b can be a needle thread.

[0066] The first yarn 103a is exposed at least in sections with the valleys towards the inner side B.

[0067] The second yarn 103b is exposed at least in sections with the mountains towards the outer side A.

[0068] The first yarn 103a is formed entirely from modified polyethylene terephthalate. Thus, the first yarn 103a is formed entirely from a destructible section. The first yarn 103a can be formed from a plurality of fibers, all of which are formed from modified polyethylene terephthalate. The modification refers to the "non-resistance or limited resistance" to strong alkalis (pH 12-14). The second yarn 103b is also formed from a plurality of fibers. The second yarn 103b can be formed from a natural material, a semi-synthetic material, or a synthetic material, whereby the material is different from the destructible section, i.e., here, the first yarn 103a. In this embodiment, the material of the second yarn 103b corresponds to the material of the first surface section 101. Both can be formed from cotton, for example.

[0069] According to the invention, the first yarn 103a has the destructible portion which is destructible by pressure cooking.

[0070] Thus, the first yarn 103a can withstand relatively high temperatures during washing and exhibit the required stiffness / strength. Furthermore, the first yarn 103a with the destructible section is only partially used in the seam structure alongside the second yarn. Thus, technical, tactile, and / or optical requirements can be achieved via the second yarn 103b, in particular via the selection of the material of the second yarn, which is different from the material of the destructible section. Furthermore, the only partial use of the first yarn 103a with the destructible section can increase cost efficiency. Pressure cooking can be implemented easily, which in turn can promote cost efficiency when separating the seam structure.

[0071] The present invention is particularly suitable for separating the seam structure according to type. Thus, the first surface section 101 and the second yarn 103b, which consist of cotton, can be subjected to a recycling process. On the other hand, the second surface section 102b, which consists of a synthetic fabric, for example, can be subjected to a different recycling process.

[0072] After pressure cooking, the destructible section (first yarn 103a) is dissolved in a fluid. This solution can be further processed accordingly.

[0073] Pressure cooking is carried out as follows. Reference is made to Figures 2 and 3, which show a separating device 10 according to the invention.

[0074] Fig. 2 shows a preparatory step for pressure cooking. A connecting structure 1, which can be, for example, the connecting structure 100 shown above, is placed in a permeable support device 5. The permeable support device 5 is formed here by a metal container. The metal container comprises a wide-mesh wire mesh.

[0075] Here, several connecting structures 1 are introduced into each support device 5. However, only one connecting structure 1 can be provided per support device. The seam ends can be opened before pressure cooking, in particular before introduction into the support device, in order to destroy the first yarn more reliably. A plurality of support devices 5 are introduced into a sealable container 11. It should be noted that the seam structures of the connecting structures 1 in each support device 5 and across the plurality of support devices 5 are identical with regard to the material of the first yarn 103a.

[0076] The support device 5 accommodates the connecting structures 1 in such a way that their position with respect to the support device is essentially fixed. Deformation of the connecting structure 1 can also be largely prevented. For this purpose, the support device supports the connecting structure 1 all around. It can

[0077] I especially clamp.

[0078] The support devices 5 can be inserted into the container 11 via a container opening 11a and can be fixed in one position in the container 11, but can also be provided loosely in the container. Here, the support devices can be mounted on a base 12 of the container.

[0079] II and be attached to it.

[0080] After the support devices 5, including the connecting structures 1, are arranged in the container 11 and a fluid for pressure cooking has been filled up to a filling limit 20 (see Fig. 3), which is below the maximum filling volume of the container 11 but covers the connecting structures 1 in the container, the container opening 11a is closed in a pressure-tight and gas-tight manner with a lid 15 of the container 11, as shown in Fig. 3. The container 11 has a supply section 11b and a discharge section 11c, via which the fluid can be supplied and discharged. The supply section 11b and the discharge section 11c are, in particular, spaced further apart from one another than a length of the support device 5. In other words, the supply section 11b and the discharge section 11c arrange the support device between them in the direction of gravity.

[0081] Filling with fluid below a maximum fill volume promotes a rapid pressure increase. A liquid, particularly pure water, is used as the fluid here. However, particularly in the case of modified polyethylene terephthalate, a chemical additive, such as a base, particularly sodium hydroxide (NaOH), or an acid, can be added to the water. The fluid, here water and sodium hydroxide, is heated to a temperature between 110°C and 120°C by a heating device 14 arranged in the base 12, shown schematically in Figures 2 and 3.

[0082] During heating by the heating device 14 and / or after reaching the desired target temperature, a fluid conveying device 13, also located in the base and designed here as a circulation pump, conveys the fluid through the container 11, thus flushing the connecting structures 1 including the weld seams. The supply and discharge sections may be blocked. During heating, the pressure in the container also increases, since the residual gas above the fill level cannot escape. The pressure can, for example, rise to at least 2 bar.

[0083] The excess pressure compared to atmospheric pressure allows a further increase in temperature above the respective boiling point, especially of water, of 100°C at atmospheric pressure. It also supports the dissolution of the destructible section, here the entire first yarn 103a. If the seam structure is continuously pressure-cooked over a predetermined period of time, for example, several minutes, at a predetermined temperature, for example, in the above range between 110°C and 120°C, and a predetermined pressure, for example, 2 bar, the destructible section is destroyed.

[0084] With the destruction of the destructible section, the seam structure is also separated.

[0085] When the entire first yarn 103a is destroyed, i.e. has dissolved, the fluid is drained from the container 11.

[0086] The support devices 5 are then removed from the container 11, and the connecting structures 1 with the separated seam structures are removed from the support devices 5. Since the seam structure is separated, the surface section, the coupling element, and the second yarn can be easily separated from each other mechanically. Each element can be separated into separate types, meaning it can be subjected to a specific recycling process without further separation.

[0087] The above steps can be performed mechanically and semi- or fully automated.

[0088] The following features can be used individually or in combination with the above embodiment.

[0089] The second yarn 103b may be configured so that it is not destructible by pressure cooking. However, it may be destructible in other ways.

[0090] Alternatively, the second yarn 103b may be destructible at a different temperature and / or pressure and / or with a different fluid than the first yarn 103a. In this case, for example, the second yarn 103b may be destructible at a temperature between 120°C and 130°C. Pressure cooking may be performed in stages, first destroying the destructible portion and then increasing the temperature and / or pressure to destroy the second yarn 103b.

[0091] In particular, the second yarn 103b may have a higher stiffness and / or strength than the first yarn 103a, especially the destructible portion. The second yarn 103b may be surface-treated. For example, it may be dyed or surface-treated in another way, as stated above. Furthermore, the first yarn 103a, at least the destructible portion thereof, may not be surface-treated.

[0092] The embodiment describes a case where the first yarn is formed entirely from modified polyethylene terephthalate. However, the first yarn may also be formed only in the destructible portion thereof. The destructible portion may also be provided only at at least one intersection point.

[0093] Alternatively, the destructible section or the entire first yarn can be made of polyvinyl alcohol with a high degree of polymerization and hydrolysis. In this case, too, pressure cooking can be carried out with water and, if necessary, a chemical additive such as an alkali and / or acid.

[0094] It is also possible for the destructible section or the entire first yarn to comprise a plurality of materials, such as modified polyethylene terephthalate and polyvinyl alcohol, which are destructible, in particular under different conditions but with the same fluid. In this case, too, pressure cooking can be carried out with water and, if appropriate, a chemical additive, such as an alkali and / or acid. In this case, pressure cooking can be carried out in stages. During staged pressure cooking, fresh fluid without destructed material can be continuously fed into the container 11 via the feed section 11b and then discharged with destructed material via the discharge section 11c, so that the destructed materials do not mix. In this case, a feed pump can be used as the fluid conveying device instead of the circulation pump.Alternatively, after pressure cooking at a predetermined temperature and / or pressure, the fluid can be drained and fresh fluid can be added for pressure cooking at an elevated temperature and / or pressure.

[0095] It is not necessary for the second yarn to be made of the same material as the surface section and / or the coupling element.

[0096] Furthermore, the second yarn can also be arranged on an inner side.

[0097] The separation device with the container was described above. However, an autoclave or a high-temperature dyeing kettle can also be used to perform pressure cooking.

[0098] The above describes pressure cooking using the packaged process, where the seam or joint structure is contained (packaged) in the support device. However, the seam or joint structure can also be pressure cooked unpackaged.

Claims

Patent claims 1. A seam structure (103) comprising: a first yarn (103a) having a destructible portion; and a second yarn (103b) forming a seam together with the first yarn (103a) and made of a material different from a material of the destructible portion, wherein at least the destructible portion is made of a material that is resistant to water at a temperature below 100°C and destructible by pressure cooking in water or in an aqueous solution at a temperature above 100°C.

2. The seam structure (103) according to claim 1, wherein the second yarn (103b) is not destructible by pressure cooking.

3. The seam structure (103) according to claim 1, wherein the second yarn (103b) is destructible by pressure cooking under different conditions than the destructible portion.

4. The seam structure (103) according to claim 1 or 2, wherein the second yarn (103b) has a higher stiffness and / or strength than the destructible portion.

5. The seam structure (103) according to at least one of the preceding claims, wherein the second yarn (103b) is surface-treated at least in sections, in particular bleached and / or dyed, and the destructible section is at least in sections unbleached and / or undyed.

6. The seam structure (103) according to at least one of the preceding claims, wherein the destructible section comprises polyvinyl alcohol, in particular is formed therefrom.

7. The seam structure (103) according to at least one of the preceding claims, wherein the destructible portion comprises modified polyethylene terephthalate, in particular is formed therefrom.

8. The seam structure (103) according to at least one of the preceding claims, wherein the destructible portion comprises a plurality of different materials which are destructible in particular at different temperatures and / or pressures, and / or the destructible portion comprises polyvinyl alcohol and modified polyethylene terephthalate.

9. A connecting structure (100) comprising: a surface portion (101); a coupling element (102); and the seam structure (103) according to at least one of the preceding claims, wherein the surface portion (101) and the coupling element (102) are coupled via the seam structure (103).

10. The connecting structure (103) according to claim 9, wherein the second yarn (103b) is exposed at least in sections to an outer side of the connecting structure.

11. The connecting structure (103) according to claim 9 or 10, wherein the surface element (101) and / or the coupling element (102) is formed at least in sections from the material of the second yarn (103b).

12. A method for separating a seam structure (103), which seam structure (103) comprises: a first yarn (103a) and a second yarn (103b) which together with the first yarn (103a) forms a seam, wherein the first yarn (103a) has at least one destructible section which is formed from a material which is resistant to water at a temperature below 100°C and is destructible by pressure cooking in water or in an aqueous solution at a temperature above 100°C; the method comprising: - pressure cooking the seam structure (103) in water or in an aqueous solution at a temperature above 100°C, whereby the destructible portion of the first yarn (103a) is destroyed.

13. The method of claim 12, wherein the water or aqueous solution is moved relative to the seam structure during pressure cooking.

14. A method according to claim 12 or 13, wherein a plurality of seam structures (103) are pressure cooked which have the same destructible portion with respect to the material.

15. The method according to any one of claims 12 to 14, wherein at least the second yarn (103b) is supported during pressure cooking.

16. Use of a pressure cooking device as a separating device (10) for separating a seam structure (103) according to at least one of claims 1 to 8 or for separating a connecting structure according to one of claims 9 to 11 or for carrying out a method for separating a seam structure (103) according to one of claims 12 to 15, which pressure cooking device comprises: - a container (11) for holding a fluid; - a fluid conveying device (13) designed to move the fluid inside the container (11); and - a heating device (14) designed to heat the fluid; and - a permeable support device (5) which is designed to receive a seam structure (103) or a connecting structure (100) having at least one seam structure (103) according to at least one of claims 9-11, and is arranged in the container (11).