Data transmission cable and method for producing shielded data transmission cable

Abstract

The invention relates to a data transmission cable (101) having a cable sheath (163) and at least one core pair (103), the at least one core pair (103) having a first conductor (105) and a second conductor (107) and a first shielding structure surrounding the at least one core pair (103) over a longitudinal extension of the at least one core pair (103), the at least one wrapped core wire pair (103) is wrapped by a cable sheath (163), and wherein the first shielding structure has a first cover film (141) and a first braid structure (143) wrapping the first cover film (141) and a second cover film (147) wrapping the first braid structure (143), characterized in that a second shielding structure is also present within the cable sheath (163), the second shielding structure covers the at least one covered core wire pair (103), the second shielding structure is provided with a second braided structure (161) and is arranged on the inner side face of the cable sheath (163), and the first cover film (141) and / or the second cover film (147) are / is lubricated films.

Description

Technical Field

[0001] The invention relates to a data transmission cable and a method for producing a shielded data transmission cable. Background Art

[0002] A data cable (data transmission cable, UTP, STP, cable, network cable, Ethernet cable, LAN cable, or twisted pair cable) is generally a cable configured to transmit data.

[0003] A data cable has, in particular, at least two conductors (cores) or an inner conductor and an outer conductor or a conductor bundle comprising a plurality of cores, and a cable sheath, and may also have filling material, separating elements and / or barriers.

[0004] The core wire is in particular a plastic-insulated copper conductor. The core wire typically has a diameter of 0.9 mm or 1.1 mm. One core wire and / or multiple core wires can be surrounded by a conductive shielding structure. The shielding structure can typically have a metal foil (e.g. aluminum foil), a metallized plastic film, a wire braiding structure or a combination of the above. The shielding structure is particularly used to reduce the influence of external electromagnetic fields and to reduce the mutual influence with electromagnetic fields induced by devices or cables, for example. In addition, the shielding structure can reduce or prevent interference radiation. According to ISO / IEC 11801, "U" means an unshielded cable, where the reduction of external influences is achieved by means of symmetry, "F" means a foil shielding structure, "S" means a braided structure shielding structure, and SF means a braided structure-foil shielding structure.

[0005] Cable jacket materials are typically PVC, polyurethane, polyethylene, or other halogen-free and flame-retardant polymer blends.

[0006] The filling material can contain, in particular, plastic and in particular fill the spaces between a plurality of cores or pairs of cores.

[0007] Data cables are used, in particular, for installing telephone and computer networks or in fieldbus technology. They are conductors or partial conductors that connect devices. Device connections via data cables are typically implemented as physical plug-in connections. For this purpose, plugs (such as RJ45 plugs) are typically located at both ends of the data cable for connection. In other words, data cables enable communication between electronic devices.

[0008] In the prior art, different data cable designs are known which are provided for specific applications or specific scenarios, for example for short or long distances, particularly space-saving, highly flexible or particularly waterproof.

[0009] Data cables with twisted pairs of conductors are known. They are known to provide better electromagnetic protection against interference fields than parallel conductors. Twisted pairs are particularly useful for symmetrical signal transmission. The pairs typically have a standardized color coding (especially gray, orange, blue, and black). Ethernet cables with four conductors typically have the color coding: white, blue, yellow, and orange. Ethernet cables with eight conductors typically have the color coding: white-green, green, white-orange, orange, white-blue, blue, and white-gray, gray.

[0010] Data cables are known which have a plurality of twisted wire pairs, which are twisted together in the data cable.

[0011] Data cables are also classified according to their transmission capabilities. Performance relates to transmission distance, conductors, plugs, and other network components and is defined in accordance with ISO / IEC 11801 or EN 50173. Category 7 data cables (Class F) are capable of operating frequencies up to 600 MHz, while Category 7A (Class FA) is capable of operating frequencies up to 1000 MHz. Cat7 cables have four individually shielded pairs of wires within a shared shield.

[0012] For data cables used in applications where they must withstand continuous movement, particularly with narrow and changing bending radii (e.g., in drag chains), the cores of known data cables have a shielding structure achieved by means of a film and a braided structure on the film. For such data cables designed for continuous movement, the shielded core pairs are typically also sheathed with an extruded insulation layer, so that the shielded core pairs do not contact the shielding structure near the cable jacket, which is usually designed as a braided structure. This separation prevents friction between the shielding structures near the cores caused by movement, as well as friction between the shielding structures near the cores and the shielding structures near the cable jacket, thereby preventing damage to the shielding structure. This known design of data cables for continuous movement results in high manufacturing costs for mass production. Furthermore, such data cables have a relatively large diameter.

[0013] DE 10 2012 024 386 A1 discloses a cable for transmitting signals, which has a plurality of cores, to whose inner conductors electrically conductive end pieces are fastened.

[0014] DE 102015216470A1 discloses a cable, in particular a data transmission cable, comprising at least one core wire having an inner conductor and a core wire sheath directly placed on the inner conductor, the core wire sheath comprising a dielectric layer made of foamed, uncrosslinked thermoplastic, preferably polyethylene or polypropylene, wherein an outer skin layer made of non-foamed, chemically crosslinked polyethylene is arranged around the dielectric layer.

[0015] DE 102017210096 A1 discloses a data cable comprising at least one wire pair and a cable jacket surrounding the at least one wire pair. The at least one wire pair comprises two wires twisted together in the longitudinal direction of the data cable. A gap between the at least one wire pair and the cable jacket is at least partially filled with a filler. The filler has a certain viscosity, allowing the filler to adhere to the data cable. When a predetermined pressure difference exists between one end of the data cable and the other end of the data cable, the filler remains at least substantially completely within the data cable.

[0016] DE 102016209138 B4 discloses a data cable having at least one core wire pair and an internal element, the core wire pair having two core wires extending parallel in the longitudinal direction of the data cable, the internal element having at least one flat section, wherein the at least one core wire pair and the internal element are arranged in the data cable so that the at least one core wire pair rests on the at least one flat section of the internal element, wherein the internal element has at least one core wire for data transmission at a low data transmission rate, wherein the at least one core wire for data transmission at a low data transmission rate is respectively arranged on the short sides of the internal element and is integrated into the internal element.

[0017] DE 102023106767A1 discloses a shielded twisted-pair cable having a twisted pair of wires and a shielding structure. The twisted pair of wires includes two insulated wires twisted together, and the shielding structure is configured to cover the twisted pair of wires. Each of the two insulated wires includes a conductor and an insulator covering the conductor. The shielding structure includes a first shielding structure, a second shielding structure, and a third shielding structure, starting from the point closest to the twisted pair of wires. The first shielding structure includes a first resin tape having a metal foil, the first tape being spirally wound around the twisted pair of wires, the second shielding structure includes a braided conductor, and the third shielding structure includes a second resin tape having a metal foil. The metal foil of the first resin tape having a metal foil contacts the braided conductor, and the braided conductor contacts the metal foil of the second resin tape having a metal foil.

[0018] DE 2547152 A1 discloses an electrical shielding structure for cables and conductors using a conductive film, wherein the shielding structure consists of a plastic film that is configured to be conductive.

[0019] DE 10 2016 221 661 A1 discloses a data cable having a core and a shield surrounding the core, the shield comprising a first shielding structure having a plurality of individual shielding wires, wherein some of the shielding wires are replaced by at least one transmission element.

[0020] DE 10315609 A1 discloses a data transmission cable consisting of at least two twisted cores, each core having a conductor surrounded by an insulation layer. Both cores are surrounded by a common electrical shielding structure. The two cores have a solid, non-foamed insulation layer and are twisted together into a cable core using two bundles of foamed insulation material. The cable core is surrounded by a film of foamed insulation material, and a conductive plastic nonwoven fabric formed into a tubular closed outer sheath is formed around the film. The plastic nonwoven fabric is coated with a highly conductive metal in a through-hole pattern, which is applied to and within the plastic nonwoven fabric by vapor deposition.

[0021] CN 212062012U discloses a data cable for underwater robots. This data cable has a core that surrounds a power cable, a local area network signal cable, a 5G communication cable, and a filler. A tape layer, comprising an LDPTFE film and an EMI-transparent electromagnetic shielding film, covers the outer surface of the cable core. The overall braided structure is a blend of fine carbon fiber filaments and Kevlar aramid yarn, which is coated on the outer surface of the overall tape layer. A protective mid-layer is composed of HDPE. An outer sheath, comprised of a modified PUR material, is positioned outside the overall braided structure.

[0022] There is therefore a need for a data cable which is suitable for constantly mobile use and which achieves stable shielding in this case and which has reduced production costs and a smaller diameter. Summary of the Invention

[0023] The object of the present invention is to improve the prior art.

[0024] This object is achieved by a data transmission cable, which has a cable sheath and at least one core pair, wherein the cable sheath particularly contains a thermoplastic polymer, the at least one core pair has a first conductor and a second conductor and a first shielding structure surrounding the core pair on the longitudinal extension of the at least one core pair, wherein the first shielding structure has a first cover film, a first braided structure covering the first cover film and a second cover film covering the first braided structure, wherein at least one core pair is present in a form covered by the cable sheath, wherein a second shielding structure is also present in the cable sheath, the second shielding structure covering the at least one covered core pair, wherein the second shielding structure has a second braided structure and is indirectly or directly arranged on the inner enclosure surface of the cable sheath, and the first cover film and / or the second cover film are lubricated films.

[0025] Thus, a data cable is provided that is suitable for continuous mobile use and, in this case, enables contact between the shielding structures. In particular, a very high and stable shielding effect is achieved by means of the first and second shielding structures. To this end, the first shielding structure is implemented as a three-layer shielding structure comprising a first cover film, a braided structure, and a second cover film, wherein both or one of the cover films is lubricated. In this case, the first shielding structure (also referred to as the first barrier) surrounds the core and / or core pair to be shielded along their longitudinal extent.

[0026] In the prior art, friction at the braided structure can cause damage to the braided structures of the individual wire pairs and to the braided structure of the overall shielding structure. This results in a reduced shielding effectiveness. In particular, to mitigate this adverse effect, a second covering film is provided on at least one wire pair. The second covering film covers the first braided structure of the first shielding structure of at least one wire pair and can thereby prevent friction between the first braided structure and the second braided structure and / or, if necessary, friction with the first braided structures of other wire pairs. For this purpose, the first and / or second covering films are advantageously lubricated, in particular to enable additional sliding and / or provided with a lubricant to further reduce friction. The same measures apply to the second, third, and / or fourth wire pairs and / or to the other braided structures. The first braided structure protects the inner first covering film of the wire pair, in particular, from damage, such as breakage, during continued movement. Furthermore, even if the first covering film of a core of a wire pair is damaged, the first braided structure of the wire pair will continue to maintain its shielding effectiveness. Shielding is achieved, in particular, by connecting any fragments of the first covering film that may be damaged by the corresponding first braided structure. Therefore, the configuration of the shielding structure advantageously achieves good and stable shielding in a constantly moving usage mode of the data cable.

[0027] By implementing the first and / or second cover film as a lubricated film, the sliding of the cover film on the contact surface or contact element is advantageously improved, thereby reducing the probability of damage, in particular damage due to frictional contact of the film and / or the element covering the film. Contact surface or contact element is understood in particular to mean a component surface or element arranged in the cable sheath.

[0028] The data transmission cable according to the invention advantageously has a significantly smaller cross-section than known solutions for data transmission cables intended for continuous mobile use, since no extruded insulation layer is required.

[0029] Furthermore, the data transmission cable according to the invention is advantageously easier to mass-produce than known solutions for data transmission cables for continuous mobile use and thus has lower production costs.

[0030] Surprisingly, it has been found that the data transmission cable according to the invention has a better shielding effect than known solutions and is useful in other areas of use than those with continuous movement, such as drag chains, doors, clutches, bogies, etc.

[0031] An important concept of the present invention is to protect the inner shielding structure of the core wire pairs of the data transmission cable even in a continuously moving usage mode and when frictional contact occurs with other cable components, thereby ensuring a stable shielding effect.

[0032] The following terms should be explained: A "data transmission cable," also known as a data cable, twisted pair cable, or Ethernet cable, is understood to be a cable designed for transmitting data and / or power. The data transmission cable is particularly cylindrical and has a longitudinal extension and a predefined cross-section. Additionally or alternatively, the data transmission cable can be square, rectangular, or oval. Finally, the data cable can be flat.

[0033] The data transmission cable according to the present invention, at 20°C, has a resistance of up to 290 Ω / km, a resistance differential of 2%, an insulation resistance of at least 500 MΩ*km, a time delay of up to 5.3 ns / m, a time delay (conductor to conductor of the same pair) of up to 0.25 ns / m, a capacitance (asymmetrical) of up to 1600 pF / km, a coupling attenuation of at least 80 dB (30-100 MHz), and / or a shield attenuation of at least 55 dB (30-600 MHz). Furthermore, the data transmission cable according to the present invention has an operating voltage (peak) of at least 300 V, a characteristic impedance of (100 ± 5) Ω (100 MHz), and a test voltage of 1000 V (RMS value for a wire / wire / shield configuration at 50 Hz for 1 minute). Consequently, the data transmission cable according to the present invention has a high transmission quality while also providing high shielding.

[0034] The data cable according to the present invention preferably has a minimum bending radius of 10 times (particularly 7.5 times) the diameter of the data cable for continuous mobile use and 5 times (particularly 3 times) the diameter of the data cable for a single bend. This advantageously allows the data cable to withstand frequent, high bending stresses without damage. The data transmission cable preferably comprises a cable sheath and at least one first conductor or first conductor pair. The data transmission cable may additionally or alternatively comprise a second conductor pair and / or further conductor pairs. The same possible embodiments and advantages apply to the further conductor pairs, as described below. Higher transmission rates can be achieved with the aid of the further conductor pairs.

[0035] A “wire pair” is understood to mean, in particular, two wires, also referred to as conductors or twisted pairs. The wires are, in particular, the physical transmission medium for transmitting data, in particular between a transmitter and a receiver. The wire pair can, in particular, be twisted.

[0036] The core wire, in particular, comprises one or more copper filaments in the form of a litz wire and is insulated with plastic. The plastic insulation layer in particular contains polyethylene (PE). The longitudinal extent of the core wire is preferably significantly longer than its transverse extent. In one possible embodiment, the core wire has a diameter of 0.9 mm to 1.1 mm. The litz wire preferably has a diameter of 0.4 mm to 0.55 mm, in particular a diameter of 0.47 mm. The litz wire can be constructed as AWG 24 or AWG 26 litz wire. Additionally or alternatively, the litz wire can comprise silver-plated copper.

[0037] In one embodiment, the core wire comprises copper, a copper alloy and / or silver-plated copper. Additionally or alternatively, the core wire may comprise pure copper. Finally, the core wire may additionally or alternatively comprise tin-plated copper.

[0038] The cores and / or core pairs of the data transmission cable can be present in a manner arranged in the cable sheath after predetermined mass production. Mass production advantageously realizes the transmission requirements imposed on the data cable.

[0039] In one possible embodiment, a data transmission cable comprising a plurality, in particular four, twisted conductor pairs is mass-produced. The twisted conductor pairs can additionally or alternatively be twisted together and / or twisted using other elements. Twisting can advantageously achieve improved stability and / or flexibility and / or mobility of the data cable along its longitudinal extension.

[0040] Additionally or alternatively, the batch production can have a filling material. The filling material contains in particular plastic and preferably fills the gaps between the cores or between the core pairs, thereby advantageously exhibiting a corresponding predetermined posture (also called position) or guidance of the cores and / or core pairs. The predetermined posture is particularly related to a specific distance from a starting point and can be repeated along the longitudinal extension of the data cable. Additionally or alternatively, one or more separator elements can be used to position the cores and / or core pairs. Filling material, separator elements and other elements for arranging the cores and / or core pairs are further referred to as auxiliary elements. The use of auxiliary elements makes it possible to stably maintain the data cable elements in a predetermined manner in the longitudinal extension of the data cable.

[0041] Additionally or alternatively, a data transmission direction can be defined for each conductor and / or each conductor pair. The data transmission direction can specifically be sent and / or received from a device connected to the data transmission cable. Defining the data transmission direction advantageously enables specific parameterization of the data cable to be set based on the direction. To maintain the specific parameterization, a one-to-one corresponding plug element can be used, which can advantageously be connected to only one corresponding electronic device.

[0042] A “cable sheath” is understood in particular to mean a covering of a core and / or a core pair and / or auxiliary elements. The cable sheath in particular contains a thermoplastic material, which may additionally or alternatively be cross-linked. In particular, the cable sheath may contain a thermoplastic polymer. Thermoplastic polymers may include polyvinyl chloride (PVC), polyethylene (PE), polyamide (PA) and / or polyurethane (PUR). The cable sheath may contain a flame-retardant and / or non-corrosive material (FRNC). Additionally or alternatively, the cable sheath may be designed in accordance with DIN EN 50290-2-27 (HD 624.7). The cable sheath in particular has an outer side and an inner side and is in particular hollow-cylindrical. Additionally or alternatively, the cable sheath may be formed around the core and / or core pair and hardened, or have openings for inserting the core and / or core pair. The cable sheath advantageously enables the wires and / or wire pairs and / or auxiliary elements to be protected from environmental influences, in particular from contamination, aerosols, moisture.

[0043] In one embodiment of the data transmission cable, the outer diameter of the cable sheath according to the invention is 8 mm to 10 mm, in particular 8.2 mm to 9.1 mm, in particular 8.7 mm, specifically 8.2 mm.

[0044] Electric and magnetic fields (electromagnetic fields) specifically describe the spatial distribution of forces acting on electric charges and currents. These fields can be artificially generated or naturally occurring. Artificially generated electromagnetic fields can, for example, be generated by powered devices or even induced by other cables. External forces exerted by electromagnetic fields on conductors and / or conductor pairs can significantly reduce the efficiency of data transmission tasks. To reduce the effects of external electromagnetic fields on data transmission cables, so-called "shielding" is used.

[0045] "Shielding" is understood to mean, in particular, protection of data transmission by means of conductors and / or conductors from external electric and / or magnetic fields, shielding of the conductors of a conductor pair, shielding of the conductor pairs from one another, and / or protection of the environment from electromagnetic fields of the conductors or conductor pairs. The shielding structure according to the invention comprises, in particular, a first shielding structure and a second shielding structure. The first shielding structure is designed, in particular, to surround each conductor pair, and the second shielding structure is designed, in particular, to surround all conductor pairs arranged in the cable sheath. The shielding structure is designed, in particular, to comply with DIN EN 50290-2-23 (VDE 0819), Table 2 / A (HD 624.3) (02Y).

[0046] The shielding structure here surrounds the cores and / or pairs of cores to be shielded along their longitudinal extension. In other words, the shielding structure in a hollow cylindrical data cable preferably also has a hollow cylindrical profile. Additionally or alternatively, at least one further layer may be provided that surrounds the second covering film. Alternatively or optionally in addition, at least one further layer may be arranged between the first covering film and the first braided structure, between the first braided structure and the second covering film, and / or between the core pairs and the first covering film. Additionally or alternatively, the first shielding structure may include at least one further layer that can particularly improve the shielding effect and / or ensure better shielding in the case of continuously moving use of the data cable. The at least one further layer may particularly be designed as an insulating layer, a separating layer, a connecting layer, an adhesive layer, a sliding layer, or may be designed to be substantially similar to the first and / or second covering films and / or to the braided structure. Within the scope of the present invention, the second braided structure may alternatively or additionally be provided with a tape layer, for example made of glass fiber or a non-woven fabric, particularly in a surrounding or wound manner.

[0047] A "cover film" is understood to be, in particular, a substantially thin film that surrounds the cores and / or core pairs along their longitudinal extension and is provided to shield against external electromagnetic fields. The cover film can, in particular, be a shielding structure or one of several layers of a shielding structure. The cover film surrounds the cores and / or core pairs to be shielded or another layer of the shielding structure along their longitudinal extension and thus, in the case of hollow cylindrical data cables, also substantially has a hollow cylindrical profile.

[0048] In one embodiment, the first cover film and / or the second cover film specifically contain aluminum. Additionally or alternatively, the first cover film and / or the second cover film may contain plastic, thereby advantageously achieving greater stability and / or better protection. Finally, the first cover film and / or the second cover film may be a lubricated film. The lubricated film may specifically contain polyethylene, polypropylene, and / or polyethylene terephthalate. The first cover film and the second cover film may consist of the same material.

[0049] A "lubricated cover film" (referring to the lubricated first cover film and / or the lubricated second cover film) is understood to mean a cover film whose slidability is enhanced by surface treatment, in particular, by the use of a sliding agent (particularly a lubricant). In one embodiment, the cover film can be lubricated with lubricol and / or oil, grease, or the like. A lubricated film advantageously has improved slidability compared to surrounding elements in contact therewith. This reduces the likelihood of damage to the shielding structure during movement of the data cable and / or during relative movement of the shielding elements.

[0050] The first cover film may have a thickness of 0.05 mm to 0.08 mm. Additionally or alternatively, a transparent sliding film made of polypropylene may be arranged between the first cover film and the core wire. The sliding film may in particular have a thickness of 0.01 mm to 0.02 mm.

[0051] The second cover film can have a thickness of 0.01 mm to 0.05 mm, in particular a thickness of 0.03 mm.

[0052] A "first braided structure" is understood in particular to be a mesh of braided and / or interwoven wires. The first braided structure can be constructed as a shielded braided structure and / or a twisted structure formed from conductive material and / or conductive wires. The first braided structure can preferably contain copper, in particular copper wires. Ultimately, the first braided structure can contain tinned copper wires, plastic and / or tinned copper. The thickness of the first braided structure can be from 0.05 mm to 0.15 mm, in particular from 0.06 mm to 0.09 mm. The first braided structure is in particular a first shielding structure of a core and / or a core pair or at least one layer of a first shielding structure of a core and / or a core pair. The first braided structure surrounds the core and / or the core pair to be shielded or surrounds another layer of a shielding structure along the longitudinal extension of the core and / or the core pair and therefore essentially has a hollow cylindrical contour in the case of a hollow cylindrical data cable. The first braided structure particularly surrounds at least one core wire pair and the first covering film, and is surrounded by at least the second covering film, the second shielding structure and / or the cable sheath, and advantageously achieves stabilization and protection of the covering film and shielding of the core wires and / or core wire pairs.

[0053] The "second shielding structure" is preferably arranged on the inner side of the cable jacket. Further layers, in particular, a separating layer, a connecting layer, an insulating layer, and / or an adhesive layer, may be arranged between the cable jacket and the second shielding structure. The second shielding structure advantageously provides an additional shielding structure that surrounds the cores, at least one core pair, and / or the core pairs that are each shielded by the first shielding structure. The second shielding structure can be designed, in particular, as a second braided structure.

[0054] A "second braiding structure" is understood to be, in particular, a braided and / or interwoven wire mesh, which is arranged, in particular indirectly or directly, on the inside of the cable jacket and / or generally surrounds all wire pairs arranged within the cable jacket. The second shielding structure and / or second braiding structure can be particularly referred to as an overall shielding structure for a plurality of wire pairs, which are twisted and twisted together, for example.

[0055] The second braided structure may contain metal. Additionally or alternatively, the second braided structure may contain plastic. Ultimately, the second braided structure may have one or more layers. The second braided structure may be designed in the same manner as the first braided structure. To avoid repetition, reference is made here to the description of the first braided structure.

[0056] Measurements have shown that the shielding structure according to the present invention achieves a shielding degree of approximately 90 percent using the braided structure. According to measurements, the shielding structure according to the present invention, consisting of the cover film and the braided structure, preferably achieves an overall shielding degree of substantially or nearly 100 percent against external electromagnetic fields. It has been shown that the data transmission cable according to the present invention has a transmission impedance of less than 15 mΩ / m at 1 MHz, less than 10 mΩ / m at 10 MHz, and less than 30 mΩ / m at 30 MHz.

[0057] According to a second aspect, the object is achieved by a method for producing a shielded data transmission cable.

[0058] In a first step of the method, at least one twisted core wire pair, a first cover film, a first braided structure and a second cover film are provided. The first cover film and / or the second cover film are in particular lubricated.

[0059] In a second step, the at least one twisted core wire is sheathed with a first cover film and subsequently with a first braided structure and then with a second cover film, thereby obtaining at least one shielded twisted core wire pair.

[0060] In an optional intermediate step, performed between the second and fourth steps, a plurality of, in particular at least two, shielded twisted core pairs are twisted together to form a twisted arrangement. Optionally, a filler can also be provided in the intermediate step and twisted together with the plurality of shielded twisted core pairs to form a twisted arrangement consisting of a plurality of twisted core pairs and the filler.

[0061] In a fourth step, a second braided structure is provided and at least one shielded twisted core pair or twisted arrangement is sheathed with the second braided structure.

[0062] In a fifth step, a cable jacket material is provided and the shielded overall arrangement structure is covered with the cable jacket material, thereby obtaining a shielded data transmission cable.

[0063] To avoid repetitions, reference is made here to the description of the first aspect, which applies in an analogous manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] The present invention will be described below by way of examples. Figure 1 A schematic diagram showing a cross section of a data transmission cable according to the present invention, and Figure 2 The method steps of the method according to the invention for producing the data transmission cable according to the invention are shown. DETAILED DESCRIPTION

[0065] Data cable 101 has four core pairs 103, 113, 123, and 133. First core pair 103 includes a first plastic-coated silver-plated multi-stranded copper wire 105 and a second plastic-coated silver-plated multi-stranded copper wire 107, wherein first plastic-coated silver-plated multi-stranded copper wire 105 and second plastic-coated silver-plated multi-stranded copper wire 107 are twisted together and covered with a first polyethylene tape layer 109. Second core pair 113 includes a third plastic-coated silver-plated multi-stranded copper wire 115 and a fourth plastic-coated silver-plated multi-stranded copper wire 117, wherein third plastic-coated silver-plated multi-stranded copper wire 115 and fourth plastic-coated silver-plated multi-stranded copper wire 117 are twisted together and covered with a second polyethylene tape layer 119. Third core pair 123 includes a fifth plastic-coated silver-plated multi-stranded copper wire 125 and a sixth plastic-coated silver-plated multi-stranded copper wire 127. The fifth and sixth plastic-coated silver-plated multi-stranded copper wires 125 and 127 are twisted together and covered by a third polyethylene tape layer 129. Fourth core pair 133 includes a seventh plastic-coated silver-plated multi-stranded copper wire 135 and an eighth plastic-coated silver-plated multi-stranded copper wire 137. The seventh and eighth plastic-coated silver-plated multi-stranded copper wires 135 and 137 are twisted together and covered by a fourth polyethylene tape layer 139. Copper wires 105, 107, 115, 117, 125, 127, 135, and 137 all have a diameter of 0.49 mm. Polyethylene tapes 109, 119, 129, and 139 each have a diameter of 1 mm. The first, second, third, and fourth core pairs 103, 113, 123, and 133 are each covered with a first lubricating aluminum foil layer 141 (an example of a first covering film), a first tinned copper wire braid 143 (an example of a first braid), and a second lubricating aluminum foil layer 147 (an example of a second covering film). Furthermore, the data cable 101 includes a first filler 151a, a second filler 151b, a third filler 151c, a fourth filler 151d, and a fifth filler 151e. Fillers 151a, 151b, 151c, 151d, and 151e have diameters ranging from 0.4 mm to 0.5 mm. The sheathed core pairs 103, 113, 123, 133 and fillers 151a, 151b, 151c, 151d, 151e are twisted together, with fillers 151a, 151b, 151c, 151d, 151e positioned between the core pairs 103, 113, 123, 133 to ensure that the core pairs 103, 113, 123, 133 are positioned relative to each other. The twisted arrangement of core pairs 103, 113, 123, 133 and fillers 151a, 151b, 151c, 151d, 151e is sheathed by a second tinned copper wire braid 161. Finally, the data cable 101 is sheathed on the outermost side by a thermoplastic copolymer jacket 163.

[0066] In a first step 100 of the method for manufacturing a data cable 101, a twisted first core pair 103, a twisted second core pair 113, a twisted third core pair 123 and a twisted fourth core pair 133 as well as a first aluminum foil layer 141, a first tinned copper wire braid structure 143 and a second aluminum foil layer 147 are provided.

[0067] In the second step 200 , the twisted core wire pairs 103 , 113 , 123 , 133 are respectively covered with the first aluminum foil layer 141 , the first tinned copper wire braid structure 143 and the second aluminum foil layer 147 , thereby obtaining four shielded core wire pairs 103 , 113 , 123 , 133 .

[0068] In a third step 300, the four shielded core wire pairs 103, 113, 123 and 133 and the five fillers 151a, 151b, 151c, 151d, 151e are twisted together and arranged to obtain a twisted arrangement structure of four shielded core wire pairs 103, 113, 123, 133 and five fillers 151a, 151b, 151c, 151d, 151e.

[0069] In a fourth step 400 , a second tinned copper wire braid 161 is provided and the arrangement is wrapped with the second tinned copper wire braid 161 , thereby obtaining a shielded arrangement of the shielded core pairs 103 , 113 , 123 , 133 and fillers 151 a , 151 b , 151 c , 151 d , 151 e .

[0070] In a fifth step 500 , a thermoplastic copolymer jacket 163 is manufactured, which encloses the shielded arrangement of the shielded core pairs 103 , 113 , 123 , 133 and the fillers 151 a , 151 b , 151 c , 151 d , 151 e , thereby obtaining a shielded data cable 101 .

[0071] In an alternative embodiment, the twisted arrangement of the fillers 151 a , 151 b , 151 c , 151 d , 151 e and the core wire pairs 103 , 113 , 123 , 133 may be omitted.

[0072] Reference Signs List 101 data cable 103 first core pair 105 first plastic coated silver-plated multi-strand copper wire 107 second plastic covered silver plated multi-strand copper wire 109 first polyethylene tape layer 113 Second core pair 115 third plastic coated silver-plated multi-strand copper wire 117th plastic covered silver plated multi-strand copper wire 119 second polyethylene tape layer 123 third core pair 125 fifth plastic coated silver-plated multi-strand copper wire 127th plastic-coated silver-plated multi-strand copper wire 129 third polyethylene tape layer 133 fourth core pair 135 seventh plastic coated silver-plated multi-strand copper wire 137 eighth plastic-coated silver-plated multi-strand copper wire 139 fourth polyethylene tape layer 141 first lubricating aluminum foil layer 143 First tinned copper wire braided structure 147 second lubricating aluminum foil layer 151a First filler 151b Second filler 151c third filling 151d fourth filler 151e Fifth Filler 161 second tinned copper wire braided structure 163 thermoplastic copolymer sheath.

Claims

1. A data transmission cable (101), comprising a cable sheath (163) and at least one core wire pair (103), wherein: The at least one core wire pair (103) has a first conductor (105) and a second conductor (107) and a first shielding structure surrounding the at least one core wire pair (103) on a longitudinal extension of the at least one core wire pair (103), wherein the first shielding structure has a first cover film (141), a first braided structure (143) covering the first cover film (141) and a second cover film (147) covering the first braided structure (143), wherein the at least one core wire pair (103) to be covered exists in the form of being covered by the cable sheath (163), characterized in that a second shielding structure is also present in the cable sheath (163), and the second shielding structure covers the at least one core wire pair (103) to be covered, wherein the second shielding structure has a second braided structure (161) and is indirectly or directly arranged on the inner enclosure surface of the cable sheath (163), and the first cover film (141) and / or the second cover film (147) are lubricated films.

2. The data transmission cable (101) according to any one of the preceding claims, wherein The first conductor (105) and / or the second conductor (107) have a diameter of 0.4 mm to 0.55 mm, and / or the first conductor (105) and the second conductor (107) are twisted with each other.

3. The data transmission cable (101) according to any one of the preceding claims, wherein The first cover film (141) and / or the second cover film (147) contain aluminum and / or plastic.

4. The data transmission cable (101) according to any one of the preceding claims, wherein The first conductor (105) and / or the second conductor (107) contain copper and / or a copper alloy.

5. The data transmission cable (101) according to any one of the preceding claims, wherein The first braided structure (143) and / or the second braided structure (161) have copper wires.

6. The data transmission cable (101) according to any one of the preceding claims, wherein The outer diameter of the cable sheath (163) is in the range of 8 mm to 10 mm.

7. The data transmission cable (101) according to any one of the preceding claims, wherein The first shielding structure has a transmission impedance lower than 15 mΩ / m at 1 MHz, a transmission impedance lower than 10 mΩ / m at 10 MHz, and a transmission impedance lower than 30 mΩ / m at 30 MHz.

8. A method for manufacturing a shielded data transmission cable (101) according to any one of claims 1 to 7, the method comprising the following steps: - providing (100) at least one twisted core pair (103), a first cover film (141), a first braided structure (143) and a second cover film (147), - covering (200) the at least one twisted core wire pair (103) with the first covering film (141), and then covering the at least one twisted core wire pair (103) covered by the first covering film (141) with the first braided structure (143), and then covering the at least one twisted core wire pair (103) covered by the braided structure (143) with the second covering film (147), thereby obtaining at least one shielded twisted core wire pair (103), - providing (400) a second braided structure (161) and covering the at least one shielded twisted core wire pair (103) with the second braided structure (161), thereby obtaining a shielded overall arrangement structure, - Providing (500) a cable sheathing material (163) and covering the shielded overall arrangement structure with the cable sheathing material (163), thereby obtaining a shielded data transmission cable (101).

9. The method according to claim 8, characterized in that At least two twisted core wire pairs (103) are provided and the method further comprises the following steps: twisting the at least two twisted core wire pairs (103) with each other (300) into a twisted arrangement structure, wherein the twisted arrangement structure is sheathed into the shielded overall arrangement structure using the second braided structure (161).

10. The method according to claim 9, characterized in that At least one filler (151a) is additionally provided and the filler (151a) is twisted with the at least two twisted core wire pairs (103) to form a twisted arrangement structure consisting of the core wire pairs (103) and the filler (151a), wherein the twisted arrangement structure is sheathed into the shielded overall arrangement structure using the second braided structure (161).

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