Preparation device and preparation method of double parallel lines

Abstract

The present invention relates to an apparatus for preparing double parallel wires, which is an apparatus for preparing a flat cable by insulating extrusion molding two wires through a die, and which is provided with: a die having a core die and a neck die, the core die being provided with two wire passing holes arranged in parallel to each other, the two wire passing holes being arranged in parallel to each other, and the neck die being arranged in parallel to each other; an extrusion opening is formed between the core mold and the mouth mold, the insulating resin is extruded from the extrusion opening, and when viewed from a cross section orthogonal to the discharge direction of the wire, the core mold is flat, and the mouth mold is circular or elliptical.

Description

Technical Field

[0001] The invention relates to a preparation device and a preparation method of double-branch parallel wires. Background Art

[0002] In the face of higher demands for high-frequency fields (such as QSFP 40G and above) such as large-scale data transmission, cloud computing information services, and aerospace communications in the future, it is required to further improve the performance of cables in the field of high-speed data transmission technology.

[0003] In the past, a symmetrical parallel twin-axial cable as described in Patent Document 1 was used to improve transmission efficiency. The symmetrical parallel twin-axial cable has two independent insulated and coated cables that are symmetrically parallel and coated with a shielding layer such as aluminum foil to form a signal transmission pair structure. However, such a symmetrical parallel twin-axial cable is limited by its own structure and has the following defects: ① It is impossible for the two cables to be 100% identical, which leads to a signal transmission delay difference (i.e., Intra-pair skew) between the wires when the signal is transmitted through the two cables. In addition, the greater the difference between the two cables, the greater the impact on the delay difference; ② When the symmetrical parallel twin-axial cable is bent, due to the differences in the bending angles and stress points of the two cables, the high-frequency performance such as the large delay difference will be reduced.

[0004] In view of this, a two-core flat cable as described in Patent Document 2 is proposed, which includes two conductors arranged in parallel and formed by extruding insulation through a parallel flat oval die.

[0005] However, when manufacturing a two-core flat cable using an existing parallel flat elliptical mold (the core mold and the mouth mold of the mold are both elliptical), there is often a concern that the insulating material collapses in the middle of the two conductors, resulting in defective cables such as a figure-8-shaped cable, a two-core asymmetrical parallel cable, or a cable with missing material between the conductors. These defective cables have large delay differences and reduced high-frequency performance.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Chinese Utility Model CN215868692U

[0009] Patent Document 2: Chinese invention patent application CN109003710A Summary of the invention

[0010] Technical problem to be solved by the invention

[0011] The inventor of the present invention focused on the changes in the cable preparation mold. After repeated research, it was found that during production, by changing the shape of the mouth mold and the core mold of the mold and appropriately designing their size relationship, a double parallel wire in the form of a flat cable can be manufactured. The signal transmission delay difference between the wires is small and the high-frequency performance is further improved.

[0012] The present invention is completed in view of the above situation in the prior art, and its purpose is to provide a preparation device for extruding two wires into a flat double parallel wire through a die insulation, and a preparation method for preparing the double parallel wire. The preparation device and preparation method of the double parallel wire of the present invention can reduce the signal transmission delay difference between the wires and improve the high-frequency performance of the cable.

[0013] Technical means for solving technical problems

[0014] A preparation device for double-branch parallel wires according to one aspect of the present invention is a preparation device for double-branch parallel wires that is configured to extrude two conductive wires into a flat cable through a die through insulation, and comprises: a die, which is located at the discharge end of the preparation device for double-branch parallel wires and is used to form the double-branch parallel wires; a barrel, which is arranged along the discharge direction of the double-branch parallel wires and is used to transport insulating resin and the conductive wires; a heater, which is arranged near the barrel and is used to heat the insulating resin transported in the barrel; a feed rod, which is arranged coaxially with the barrel and is used to transport the insulating resin; a hopper, which is located at the feed end of the preparation device for double-branch parallel wires and is used to add and store the insulating resin; and a conductive wire channel, which is arranged in the vicinity of .... The barrel is provided with two wires for transporting the two wires. The mold has a core mold and a mouth mold. The core mold is provided with two circular wire passage holes for the wires to pass through. The two wire passage holes are arranged parallel to each other. An extrusion port is formed between the core mold and the mouth mold. Insulating resin for insulating and coating the wires is extruded from the extrusion port. When observed from a cross section orthogonal to the discharge direction of the wires, the core mold is flat and the mouth mold is circular or elliptical. When the cross-sectional area of ​​the mouth mold is set to S1, the cross-sectional area of ​​the core mold is set to S2, the cross-sectional area of ​​the two parallel wires is set to S3, and the cross-sectional area of ​​the wire is set to S4, the cross-sectional area of ​​the extrusion port is ΔS 12 is the difference between the cross-sectional area S1 of the die and the cross-sectional area S2 of the core die, and the insulation area ΔS of the two parallel lines 34 is the difference between the cross-sectional area S3 of the two parallel wires and the cross-sectional area S4 of the conductor, and the stretching ratio DDR is the cross-sectional area ΔS of the extrusion port. 12 The insulation area ΔS of the two parallel lines 34 The stretching ratio DDR satisfies: 15≤DDR≤50.

[0015] In the preparation device of the double-branch parallel wire according to the present invention, since the core mold is flat and the die is circular or elliptical, when the double-branch parallel wire is stretched and formed, the insulating resin extruded from the extrusion port fills the gap between the two wires in the short axis direction of the core mold when observed from the cross section perpendicular to the discharge direction of the wire, so that the double-branch parallel wire can be formed into a flat cable. In addition, when the ratio of the cross-sectional area of ​​the extrusion port to the insulation area of ​​the double-branch parallel wire, that is, the stretching ratio DDR satisfies: 15≤DDR≤50, the double-branch parallel wire formed by stretching has a structure of a flat cable roughly like a playground runway, so that the signal transmission delay difference between the wires can be reduced and the high-frequency performance of the cable can be improved.

[0016] In the device for preparing double-branch parallel wires in one aspect of the present invention, optionally, the stretching ratio DDR satisfies: 20≤DDR≤50.

[0017] In the preparation device of double-branch parallel lines of the present invention, optionally, when the spacing between the two conductive wires of the double-branch parallel lines is set to L, the spacing L satisfies: 0.2mm≤L≤1mm, when the length of the double-branch parallel lines in the long axis direction is set to A, the length A of the double-branch parallel lines in the long axis direction satisfies: 0.8mm≤A≤3mm, when the length of the double-branch parallel lines in the short axis direction is set to B, the length B of the double-branch parallel lines in the short axis direction satisfies: 0.4mm≤B≤1.5mm.

[0018] In the device for preparing double-branch parallel wires of the present invention, optionally, when the wall thickness between each of the two conductive wires of the double-branch parallel wire and the outer edge of the double-branch parallel wire is set to t, the following is satisfied: 0.1 mm ≤ t ≤ 0.5 mm.

[0019] In the preparation device of double-branch parallel wires of the present invention, optionally, when the spacing between the two wires of the double-branch parallel wires is set to L, and the spacing between the two wire passing holes of the core mold is set to l, it satisfies: L≤l≤2L, when the length of the double-branch parallel wire in the long axis direction is set to A, and the length of the core mold in the long axis direction is set to a, it satisfies: A≤a≤4A, when the length of the double-branch parallel wire in the short axis direction is set to B, and the length of the core mold in the short axis direction is set to b, it satisfies: B≤b≤4B.

[0020] In the preparation device of the double-branch parallel wire of the present invention, optionally, when the die is circular, the length of the long axis direction of the double-branch parallel wire is set to A, and the diameter of the die is set to When the diameter of the die satisfy:

[0021] In the preparation device of the double-branch parallel wire of the present invention, optionally, when the die is elliptical, the length of the long axis direction of the double-branch parallel wire is set to A, and the long diameter of the die is set to The short diameter of the die is set to When the long diameter of the die satisfy: The short diameter of the die satisfy:

[0022] Another aspect of the present invention is a method for preparing double-branch parallel wires, which uses the above-mentioned double-branch parallel wire preparation device to prepare the double-branch parallel wires in one piece through the following steps, including: a wire preparation step: preparing two wires of the same specification and the same material, arranging them parallel to each other and passing them through the core mold; an insulation extrusion step: coating the two wires with an insulating resin extruded between the core mold and the die to form a double-branch parallel wire.

[0023] By using the above-mentioned double-branch parallel wire preparation device to prepare the double-branch parallel wire preparation method, a double-branch parallel wire having a structure of a flat cable roughly like a playground runway can be manufactured, thereby reducing the signal transmission delay difference between the wires and improving the high-frequency performance of the cable.

[0024] Effects of the Invention

[0025] The device and method for preparing the double-branch parallel wires according to the present invention can reduce the signal transmission delay difference between the conductors and improve the high-frequency performance of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 1 is a cross-sectional view schematically showing an example of an apparatus 100 for producing a double-branched parallel wire W according to one aspect of the present invention.

[0027] Figure 2 FIG. 1 is a cross-sectional view schematically showing an example of a mold 10 of an apparatus 100 for producing a double-branched parallel wire W according to an aspect of the present invention.

[0028] Figure 3 1 is a cross-sectional view schematically showing a double-branched parallel wire W produced by a double-branched parallel wire W production apparatus 100 according to one aspect of the present invention.

[0029] Figure 4 FIG. 1 is a cross-sectional view schematically showing another example of the mold 10 of the apparatus 100 for producing the double-branched parallel wires W according to one aspect of the present invention.

[0030] Figure 5 This is a photograph showing a double-branched parallel wire manufactured by a method for manufacturing a double-branched parallel wire using a conventional mold.

[0031] Figure 6 are photographs showing double-branched parallel wires W prepared according to Examples and Comparative Examples.

[0032] Reference numerals

[0033] W...Double parallel lines

[0034] 100……Preparation device

[0035] 10…Mold

[0036] 20……Barrel

[0037] 30...Heater

[0038] 40...Feed rod

[0039] 50...Stocker

[0040] 60...Wire channel

[0041] 1... Mouth mold

[0042] 2...Core mold

[0043] 3, 4...Wire passing hole

[0044] 5...Extrusion port

[0045] C...Wire

[0046] R...Insulating resin

[0047] S1... Cross-sectional area of ​​the die

[0048] S2……Cross-sectional area of ​​the core mold

[0049] S3... the cross-sectional area of ​​the two parallel lines S4... the cross-sectional area of ​​the conductor

[0050] ΔS 12 ...cross-sectional area of ​​the extrusion port

[0051] ΔS 34 ...Insulation area of ​​two parallel wires DDR ...Stretching ratio

[0052] A... Length of the two parallel lines in the long axis direction B... Length of the two parallel lines in the short axis direction a... Length of the mandrel in the long axis direction b... Length of the mandrel in the short axis direction ...Die diameter ...The long diameter of the die ... short diameter of the die

[0053] L... Spacing between conductors

[0054] l... Spacing between the wire passing holes t... Wall thickness between the wire and the outer edge of the double parallel wires P1... Wire discharging process

[0055] P2...Insulation extrusion process DETAILED DESCRIPTION

[0056] Hereinafter, with reference to the accompanying drawings, the mode for implementing the present invention will be described in detail. In the accompanying drawings used in the following description, in order to facilitate the understanding of the features of the present invention, for the sake of convenience, the features are sometimes enlarged and represented, and the dimensional ratios of the various components are sometimes different from the actual ones. The materials, dimensions, etc. illustrated in the following description are an example, and the present invention is not limited thereto, and can be implemented by appropriate changes within the scope of achieving the effects of the present invention. In addition, in the description of the accompanying drawings, the same or equivalent elements are marked with the same symbols, and repeated descriptions are omitted.

[0057] [Double-branch parallel wire preparation device]

[0058] One aspect of the present invention provides a device 100 for preparing a double-branch parallel wire W.

[0059] Figure 1 FIG. 1 is a cross-sectional view schematically showing an example of a device 100 for preparing a double-branch parallel wire W according to one aspect of the present invention. Figure 1 In the embodiment, the ejection direction of the double-branched parallel line W is set as the Y direction, the height direction of the manufacturing device 100 is set as the Z direction, and the direction perpendicular to the Y and Z directions, that is, the width direction of the manufacturing device 100 is set as the X direction. In addition, in the manufacturing device 100, the end where the double-branched parallel line W is ejected in the Y direction is called the discharge end, and the end opposite to the discharge end in the Y direction is called the feed end.

[0060] like Figure 1As shown, the preparation device 100 of the double-branch parallel wire W includes a wire feeding mechanism and a resin feeding mechanism, specifically, it has: a mold 10, which is located at the discharge end of the preparation device 100 of the double-branch parallel wire W and is used to mold the double-branch parallel wire W; a barrel 20, which is arranged along the discharge direction of the double-branch parallel wire W, that is, the Y direction, and is used to transport insulating resin and wires; a heater 30, which is arranged near the barrel 20 and is used to heat the insulating resin transported in the barrel 20; a feed rod 40, which is coaxially arranged along the Y direction with the barrel 20, which is usually a screw, but is not limited to this, as long as it can be used to transport the insulating resin from the feed end to the discharge end; a storage device 50, which is located at the feed end of the preparation device 100 of the double-branch parallel wire W and is used to add and store insulating resin; and a wire channel 60, which is arranged to pass through the feed end and the discharge end of the preparation device 100, and is arranged in the barrel 20, and is used to transport the wire C from the feed end to the discharge end. Furthermore, in the present embodiment, two wire ducts 60 are provided in parallel in the X direction, and two wires C can be transported together. Figure 2 FIG. 1 is a cross-sectional view schematically showing an example of a mold 10 of an apparatus 100 for producing a double-branched parallel wire W according to one aspect of the present invention. Figure 2 This is a cross-sectional view as viewed from a cross section perpendicular to the direction in which the wire C is ejected. Figure 2 The figure shows the mouth die 1 and the core die 2 of the mold 10 of the manufacturing device 100 of the double-branch parallel wire W. Figure 2 In the embodiment, the long axis direction of the core mold 2 is set as the X direction, the short axis direction of the core mold 2 is set as the Z direction, and the direction perpendicular to the X and Z directions, that is, the discharge direction of the wire C is set as the Y direction. In addition, the long axis direction of the core mold 2, that is, the X direction, is set as the horizontal direction of the die 1, and the short axis direction of the core mold 2, that is, the Z direction, is set as the vertical direction of the die 1.

[0061] The double-branch parallel wire manufacturing device 100 of the present invention is a manufacturing device for arranging two conductors C of the same specification and the same material in parallel with each other, and extruding and molding the double-branch parallel wires into a flat cable through a die 10 for insulation. The device comprises: the die 10 has a mouth die 1 and a core die 2. The core die 2 is provided with two circular conductor passage holes 3 and 4 for the conductors C to pass through. The two conductor passage holes 3 and 4 are arranged in parallel with each other and communicate with the above-mentioned two conductor channels 60. An extrusion port 5 is formed between the core die 2 and the mouth die 1, and is communicated with the above-mentioned barrel 20. The insulating resin R (refer to Figure 3 ). When viewed from a cross section orthogonal to the discharge direction Y of the wire C, that is, an XZ cross section, the core die 2 is flat and the die 1 is circular or elliptical, preferably circular. Figure 2The example in which the die 1 is circular is shown. In addition, when the die 1 is elliptical, it can be an ellipse with the X-axis direction as the major axis direction and the Z-axis direction as the minor axis direction, or it can be an ellipse with the Z-axis direction as the major axis direction and the X-axis direction as the minor axis direction. Figure 4 As shown, an example is shown in which the die 1 has an elliptical shape with the X-axis direction as the major axis direction and the Z-axis direction as the minor axis direction.

[0062] By setting the die 1 and the core die 2 in such a shape, when the double-branch parallel wire W is stretched and formed, the insulating resin R extruded from the extrusion port 5 fills the gap between the two conductors C in the short axis direction of the core die 2, that is, the Z direction, so that the double-branch parallel wire W can be formed into a flat cable. As a result, the signal transmission delay difference between the conductors C can be reduced, and the high-frequency performance of the cable of the double-branch parallel wire W can be improved.

[0063] In addition, the preparation device 100 of the double-branch parallel wire W of the present invention is not limited to the above-mentioned device including the wire feeding mechanism and the resin feeding mechanism, and well-known equipment can also be used, which will not be repeated here.

[0064] Figure 3 FIG. 1 is a cross-sectional view schematically showing a double-branched parallel wire W produced by a double-branched parallel wire W production apparatus 100 according to one aspect of the present invention. Figure 3 In the diagram, the long axis direction of the two parallel lines W is set as the X direction, the short axis direction of the two parallel lines W is set as the Z direction, and the direction perpendicular to the X and Z directions, that is, the extending direction of the wire C is set as the Y direction. Figure 3 In the double parallel wire W shown, the two conductors C are integrally and tightly covered with an insulating resin R.

[0065] Next, refer to Figure 2 and Figure 3 , the dimensional relationship between the die 1 and the core die 2 is described. When the cross-sectional area of ​​the die 1 is set to S1, the cross-sectional area of ​​the core die 2 is set to S2, the cross-sectional area of ​​the two parallel wires W is set to S3, and the cross-sectional area of ​​the wire C, that is, the total cross-sectional area of ​​the two wires C is set to S4, the cross-sectional area of ​​the extrusion port 5 is ΔS 12 The difference between the cross-sectional area S1 of the die 1 and the cross-sectional area S2 of the core die 2 (i.e. Figure 2 The area of ​​insulation between the two parallel wires W is ΔS 34 is the difference between the cross-sectional area S3 of the two parallel lines W and the cross-sectional area S4 of the conductor (i.e. Figure 3 The stretching ratio DDR is the cross-sectional area ΔS of the extrusion port 5. 12 The insulation area ΔS between the two parallel wires W 34The stretching ratio DDR satisfies: 15≤DDR≤50, and the stretching ratio DDR is further preferably 20≤DDR≤50.

[0066] By setting the stretching ratio DDR to such a dimensional relationship, the double parallel wire W formed by stretching has a structure of a flat cable roughly like a playground track, which can further reduce the signal transmission delay difference between the conductors C and improve the high-frequency performance of the double parallel wire W cable.

[0067] Furthermore, when the spacing between the two wires C of the double-branch parallel line W is set to L (i.e., the shortest distance between the two wires C), and the spacing between the two wire passing holes 3 and 4 of the core mold 2 is set to l (i.e., the shortest distance between the two wire passing holes 3 and 4), it satisfies: L≤l≤2L, when the length of the double-branch parallel line W in the long axis direction is set to A, and the length of the core mold 2 in the long axis direction is set to a, it satisfies: A≤a≤4A, when the length of the double-branch parallel line W in the short axis direction is set to B, and the length of the core mold 2 in the short axis direction is set to b, it satisfies: B≤b≤4B.

[0068] By setting such a dimensional relationship, the double parallel wire W formed by stretching has a structure of a flat cable roughly like a playground track, which can further reduce the signal transmission delay difference between the conductors C and improve the high-frequency performance of the double parallel wire W cable.

[0069] like Figure 2 and Figure 3 As shown, when the die 1 is circular, the length of the long axis direction of the two parallel lines W is set to A, and the diameter of the die 1 is set to When the diameter of die 1 is satisfy:

[0070] Figure 4 FIG. 1 is a cross-sectional view schematically showing another example of the mold 10 of the apparatus 100 for producing the double-branched parallel wires W according to one aspect of the present invention. Figure 4 This is a cross-sectional view as viewed from a cross section perpendicular to the direction in which the wire C is ejected. Figure 4 The figure shows the mouth die 1 and the core die 2 of the mold 10 of the manufacturing device 100 of the double-branch parallel wire W. Figure 4 In the example, only the die 1 is elliptical in shape with the X-axis direction as the major axis direction and the Z-axis direction as the minor axis direction. Figure 4 In, with Figure 2 Similarly, the long axis direction of the core mold 2 is set as the X direction, the short axis direction of the core mold 2 is set as the Z direction, and the direction perpendicular to the X and Z directions, that is, the discharge direction of the wire C is set as the Y direction. In addition, the long axis direction of the core mold 2, that is, the X direction, is defined as the horizontal direction of the die 1, and the short axis direction of the core mold 2, that is, the Z direction, is defined as the vertical direction of the die 1.

[0071] like Figure 3 and Figure 4 As shown, when the die 1 is elliptical, the length of the long axis direction of the two parallel lines W is set to A, and the long diameter of the die 1 is set to Set the short diameter of die 1 to When the long diameter of die 1 satisfy: Short diameter of die 1 satisfy: Although not shown, the die 1 may also be an ellipse with the Z-axis direction as the major axis direction and the X-axis direction as the minor axis direction. In this case, when the length of the major axis direction of the two parallel lines W is set to A and the major diameter of the die 1 is set to Set the short diameter of die 1 to When the long diameter of die 1 satisfy: ≤7A, short diameter of die 1 satisfy:

[0072] By setting such a dimensional relationship, the double parallel wire W formed by stretching has a structure of a flat cable roughly like a playground track, which can further reduce the signal transmission delay difference between the conductors C and improve the high-frequency performance of the double parallel wire W cable.

[0073] like Figure 3 As shown, the size ratio of the double parallel line W can be set as: the spacing L between the two conductors C of the double parallel line W satisfies: 0.2mm≤L≤1mm, the length A of the long axis direction of the double parallel line W satisfies: 0.8mm≤A≤3mm, and the length B of the short axis direction of the double parallel line W satisfies: 0.4mm≤B≤1.5mm.

[0074] And, if Figure 3 As shown, when the wall thickness between the two wires C of the double-branch parallel line W and the outer edge of the double-branch parallel line W is set to t (ie, the shortest distance from the wire C to the outer edge of the double-branch parallel line W), the following is satisfied: 0.1mm≤t≤0.5mm.

[0075] By adjusting the dimensional ratio of the double parallel wire W to such a dimensional relationship, the double parallel wire W formed by stretching has a structure of a flat cable roughly like a playground track, thereby further reducing the signal transmission delay difference between the conductors C and improving the high-frequency performance of the double parallel wire W cable.

[0076] [Method for preparing double-branch parallel lines]

[0077] Another aspect of the present invention provides a method for preparing a double-branched parallel wire W using the double-branched parallel wire W preparation device 100 described above.

[0078] The double-branch parallel wire W is integrally prepared by the following steps. The preparation method includes: a wire discharging step P1, discharging two wires C through two wire passing holes 3 and 4 arranged in parallel with each other in the horizontal direction, that is, the X direction, provided in the core mold 2; and an insulation extrusion step P2, extruding an insulation resin R between the core mold 2 and the die 1, and insulating and covering the two wires C integrally. Through the insulation extrusion step P2, the insulation resin R fills the gap between the two wires C in the short axis direction of the core mold 2, that is, the Z direction, thereby forming the double-branch parallel wire W in the form of a flat cable.

[0079] Since the insulating resin R fills the gap between the two wires C, the two wires C are integrally and tightly covered by the insulating resin R. Such a double-branch parallel wire W has a more stable cable structure. By using the above-mentioned double-branch parallel wire W manufacturing device 100 to manufacture a double-branch parallel wire W manufacturing method, a double-branch parallel wire W having a structure of a flat cable roughly like a playground runway can be manufactured, thereby reducing the signal transmission delay difference between the wires C and improving the high-frequency performance of the cable.

[0080] Figure 5 This is a photograph showing a double-branched parallel wire manufactured by a method for manufacturing a double-branched parallel wire using a conventional mold.

[0081] In the method of preparing a double-branch parallel wire using a conventional die, it is known that the problem of missing material (insulating resin R) between the conductors C and the concavity of the insulating resin R at the top can be improved by controlling the vacuum pressure, wire speed, cooling speed, etc. At this time, by changing the shape of the die 1 from the conventional flat shape to a circular shape as in the present embodiment, the problem of missing material between the conductors C and the concavity of the insulating resin R at the top can be effectively overcome, and in the insulation extrusion step P2, the gap between the two conductors C can be effectively filled, and a double-branch parallel wire W having a structure of a flat cable in the shape of a playground runway can be formed (see Figure 6 (a)).

[0082] [Double Parallel Lines]

[0083] The material used in the double-branched parallel wire W produced by the production method using the double-branched parallel wire W production apparatus 100 described above can be selected from the following ranges, but is not limited thereto, and known materials can also be used.

[0084] The conductor C is made of one of bare copper, alloy copper, plated copper, and plated alloy copper (e.g., silver-plated copper, tin-plated copper). In the present embodiment, the conductor C is preferably made of silver-plated copper. For example, the conductor C can be selected from commercially available AWG26 to 34, with an impedance of 85 to 100 Ω, a wire diameter of 0.2 to 0.5 mm, a wire gauge of about 0.285 / 0.9*2.0 mm, and a wall thickness t between each of the two conductors C and the outer edge of the double parallel wires W of 0.1 to 0.5 mm.

[0085] The two conductors C are simultaneously released and co-extruded with fluoroplastics to form a pair of parallel wires W with higher consistency and minimum delay difference and attenuation. The insulating resin R is selected from fluoroplastics FEP, PFA, PEP, solid or foamed PE, solid or foamed PP and other materials with high melt index and low dielectric constant. In this embodiment, the insulating resin R is preferably composed of FEP.

[0086] Since the two conductors C are released at the same time and the insulating resin R is co-extruded from the fluoroplastic in parallel, the wire release tension is kept consistent, which can ensure that the consistency of the two conductors C in the insulating resin layer is higher, and the signal transmission delay difference between the conductors C is reduced. In addition, when the two parallel wires W are bent and deformed, the product structure size consistency is high, the two parallel wires W have a more stable cable structure, and the high-frequency performance is improved. In addition, the delay difference skew of the symmetrical parallel twin-axial cable with a traditional structure is usually less than 10ps / m. In comparison, the delay difference skew of the two parallel wires W with the structure of this embodiment is reduced to less than 2ps / m, and can be reduced to 0.3ps / m at best.

[0087] In addition, a shielding layer such as a copper foil tape, an aluminum foil tape or a copper-aluminum composite tape may be tightly coated on the outside of the double parallel wires W coated with the insulating resin R, and then a single-sided aluminum foil tape may be coated on the outside of the shielding layer, and then a hot-melt PET tape or a plastic sheath may be extruded on the outside of the aluminum foil tape. Thus, a double parallel wire W is formed that can reduce the signal transmission delay difference between the conductors C and improve the high-frequency performance of the cable.

[0088] [Example]

[0089] <Relationship between the structure of the double-branch parallel line preparation device and the shape of the double-branch parallel line>

[0090] In the following experiments, the inventors prepared the double-branch parallel wires W of Examples 1 to 6 by setting and adjusting the wire gauge of the double-branch parallel wires W, the size of the core mold 2, the size of the die 1, and the stretching ratio DDR. In addition, the delay difference skew can be measured by a known method. In the embodiment of the present invention, the delay difference skew of Examples 1 to 6 is measured by the following method: 1m of the finished double-branch parallel wire W is cut, and the network analyzer manufactured by Keysight Technologies is used, with a maximum frequency of 40GHz, at 25°C / 70%RH, to measure the signal transmission delay difference skew between a pair of conductors, and the measurement results are shown in Tables 1 and 2. In addition, the inventors prepared the double-branch parallel wires W of Comparative Examples 1 to 3 by changing the shape of the die 1 and the core mold 2 and the stretching ratio DDR.

[0091] Embodiments 1 to 4

[0092] Prepare Figure 2 The mold 10 of the manufacturing device 100 of the double-branch parallel wire W shown in the figure, wherein the core mold 2 is flat and the mouth mold 1 is circular. In Examples 1 to 4, the wire gauge of the double-branch parallel wire W, the size of the core mold 2, and the size of the mouth mold 1 are set as shown in Table 1, respectively, to prepare the double-branch parallel wire W of Examples 1 to 4.

[0093] [Table 1]

[0094]

[0095] Embodiment 5, 6

[0096] Prepare Figure 4 The mold 10 of the manufacturing device 100 of the double-branch parallel wire W shown in the figure, wherein the difference between Examples 5 and 6 and Examples 1 to 4 is that the core mold 2 is flat and the mouth mold 1 is elliptical. In Examples 5 and 6, the wire gauge of the double-branch parallel wire W, the size of the core mold 2, and the size of the mouth mold 1 are set as shown in Table 2, respectively, to prepare the double-branch parallel wire W of Examples 5 and 6.

[0097] [Table 2]

[0098]

[0099] Comparative Examples 1 to 3

[0100] In order to observe the influence of the size and shape of the die 1 and the core die 2 and the stretching ratio DDR on the structure of the double-branched parallel wire W, comparative examples 1 to 3 were prepared.

[0101] The difference between Comparative Example 1 and Example 1 is that the stretching ratio DDR exceeds 50. The difference between Comparative Example 2 and Example 1 is that the shape of the core die 2 is an 8-shape. The difference between Comparative Example 3 and Example 1 is that the shape of the die 1 is flat. In Comparative Examples 1 to 3, the wire gauge of the double-branch parallel wire W, the size and shape of the core die 2, and the size and shape of the die 1 are set as shown in Table 3, respectively, to prepare the double-branch parallel wires W of Comparative Examples 1 to 3.

[0102] [Table 3]

[0103]

[0104] * Due to poor forming, the wire wrapping could not be measured

[0105] evaluate

[0106] Figure 6 is a photograph showing the double-branched parallel wire W prepared according to the embodiment and the comparative example. Figure 6 (a) is a photograph showing the double-branch parallel wire W produced according to Example 1, Figure 6 (b) to (d) are photographs showing the double-branched parallel wires W produced according to Comparative Examples 1 to 3, respectively.

[0107] The double parallel wire W prepared according to Example 1 is as follows Figure 6 As shown in (a), it has a structure of a flat cable roughly in the shape of a playground runway. The insulating resin R fills the gap between the two conductors C, and the two conductors C are integrally and tightly covered by the insulating resin R. In addition, the prepared double parallel wire W does not have the problem of material shortage between the conductors C, and the problem of the insulating resin R sinking between the conductors. The double parallel wire W prepared according to Examples 2 to 6 also has a structure similar to the double parallel wire W prepared according to Example 1. Compared with the double parallel wire prepared by the method of preparing double parallel wires using a conventional mold, the prepared double parallel wire W has a structure of a flat cable roughly in the shape of a playground runway, which can reduce the signal transmission delay difference between the conductors C and improve the high-frequency performance of the double parallel wire W cable.

[0108] From the results in Tables 1 and 2, it can be seen that in Examples 1 to 6, the stretching ratio DDR is 15≤DDR≤50, and more preferably 20≤DDR≤50, and the delay skew is small, so the high-frequency performance of the cable with two parallel lines W can be improved.

[0109] The double-branch parallel wire W prepared according to Comparative Example 1 has the following characteristics: Figure 6The structure shown in (b) is shown in FIG. Since the stretching ratio DDR exceeds 50 instead of the stretching ratio DDR of 15≤DDR≤50 as in Examples 1 to 6, the prepared double-branch parallel wire W has the problem of material shortage between the conductors C and the insulating resin R sinking between the conductors. In addition, the molding defects lead to poor high-frequency performance of the double-branch parallel wire W prepared in Comparative Example 1.

[0110] The double-branch parallel wire W prepared according to Comparative Example 2 has the following characteristics: Figure 6 Since the shape of the core mold 2 is 8-shaped instead of flat as in Examples 1 to 6, the conductors C in the prepared double-branch parallel wire W cannot be arranged in parallel in the horizontal direction.

[0111] The double-branch parallel wire W prepared according to Comparative Example 3 has the following characteristics: Figure 6 Since the die 1 is flat rather than circular as in Examples 1 to 6, the insulating resin R at the upper portion of the prepared double-branch parallel wire W is recessed between the conductors C.

[0112] By comparing the double-branch parallel wire W prepared according to Examples 1 to 6 and the double-branch parallel wire W prepared according to Comparative Examples 1 to 3, it can be seen that by setting the shape of the mouth mold 1 of the mold 10 to be circular or elliptical, setting the shape of the core mold 2 to be flat, and appropriately designing their size relationship, a double-branch parallel wire W that is a flat cable roughly in the shape of a playground runway can be manufactured, and the signal transmission delay difference between the conductors C can be reduced, thereby improving the high-frequency performance of the double-branch parallel wire W cable.

[0113] Although the present invention has been specifically described above in conjunction with the accompanying drawings and embodiments, it should be understood that the above description does not limit the present invention in any form. Those skilled in the art can deform and change the present invention as needed without departing from the essential spirit and scope of the present invention, and these deformations and changes all fall within the scope of the present invention.

Claims

1. A device for preparing two parallel lines, characterized in that: It is a preparation device that extrude two wires through a die to form two parallel wires in a flat cable. have: A mold, which is located at the discharge end of the preparation device of the double-branch parallel wire and is used to form the double-branch parallel wire; A barrel, which is arranged along the discharging direction of the two parallel lines and is used to transport the insulating resin and the wire; a heater disposed near the barrel and configured to heat the insulating resin transported in the barrel; A feed rod, which is coaxially arranged with the barrel and is used to transport the insulating resin; A hopper located at the feeding end of the preparation device of the double-branch parallel lines, used for adding and storing the insulating resin; as well as The wire channel is provided with two wires in the barrel for transporting the two wires. The mold comprises a core mold and a mouth mold. In the core mold, two circular wire passing holes are provided for the wire to pass through, and the two wire passing holes are arranged parallel to each other. An extrusion port is formed between the core die and the die, and an insulating resin for insulating and coating the wire is extruded from the extrusion port. When viewed from a cross section perpendicular to the discharge direction of the wire, the core die is flat, and the mouth die is circular or elliptical. When the cross-sectional area of ​​the die is set to S1, the cross-sectional area of ​​the core die is set to S2, the cross-sectional area of ​​the two parallel wires is set to S3, and the cross-sectional area of ​​the conductor wire is set to S4, The cross-sectional area of ​​the extrusion port ΔS 12 is the difference between the cross-sectional area S1 of the die and the cross-sectional area S2 of the core die, and the insulation area ΔS of the two parallel lines 34 is the difference between the cross-sectional area S3 of the two parallel lines and the cross-sectional area S4 of the conductor, The stretch ratio DDR is the cross-sectional area ΔS of the extrusion port. 12 The insulation area ΔS of the two parallel lines 34 The ratio, The stretching ratio DDR satisfies: 15≤DDR≤50.

2. The device for preparing double parallel lines according to claim 1, characterized in that: The stretching ratio DDR satisfies: 20≤DDR≤50.

3. The device for preparing double-branch parallel lines according to claim 1 or 2, characterized in that: When the distance between the two conductors of the double parallel line is set to L, the distance L satisfies: 0.2 mm ≤ L ≤ 1 mm, When the length of the long axis direction of the two parallel lines is set to A, the length A of the long axis direction of the two parallel lines satisfies: 0.8 mm ≤ A ≤ 3 mm, When the length of the short axis direction of the two parallel lines is set to B, the length B of the short axis direction of the two parallel lines satisfies: 0.4mm≤B≤1.5mm.

4. The device for preparing double-branch parallel lines according to claim 1 or 2, characterized in that: When the wall thickness between each of the two conductive wires of the double-branch parallel line and the outer edge of the double-branch parallel line is set to t, the following is satisfied: 0.1 mm≤t≤0.5 mm.

5. The device for preparing double parallel lines according to claim 3, characterized in that: When the distance between the two wire passing holes of the core mold is set to l, it satisfies: L≤l≤2L, When the length of the long axis direction of the core mold is set to a, it satisfies: A≤a≤4A, When the length of the mandrel in the short axis direction is set to b, the following relation is satisfied: B≤b≤4B.

6. The device for preparing double parallel lines according to claim 3, characterized in that: When the die is circular, when the diameter of the die is φ, the diameter φ of the die satisfies: 2A≤φ≤7A.

7. The device for preparing double parallel lines according to claim 3, characterized in that: In the case where the die is elliptical, when the long diameter of the die is set to φ a , the short diameter of the die is set to φ b When the long diameter of the die is a Satisfy: 2A≤φ a ≤7A, the short diameter of the die is φ b Satisfaction: 0.5φ a ≤φ b ≤φ a .

8. A method for preparing a double-branch parallel line, characterized in that: A method for preparing a double-branched parallel wire in one piece by using the double-branched parallel wire preparation device according to any one of claims 1 to 7, through the following steps: include: Wire preparation step: preparing two wires of the same specification and the same material, arranging them parallel to each other and passing them through the core mold; Insulation extrusion step: the two conductors are coated with insulating resin extruded between the core die and the die to form two parallel wires.

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