Cable prestress colored tape

Abstract

The invention discloses a cable prestress colored tape, belongs to the technical field of cable manufacturing, relates to the use of colored tapes, and aims to provide a simple and cheap technical method to avoid the phenomena of large resistance fluctuation and increased signal attenuation of a communication cable caused by conductor diameter fluctuation due to tension (traction) fluctuation of a cable small-section conductor. In the whole production process, the high-strength colored tape bears the vast majority of tension (traction) to drive the cable conductor to move forwards, it can be considered that the conductor is attached to the high-strength colored tape, the high-strength colored tape drags the cable conductor to move forwards, fluctuation of the tension borne by the cable conductor can be avoided, and the cable conductor is prevented from being damaged. And excessive signal attenuation of the communication cable caused by large resistance fluctuation and large wire diameter fluctuation of the cable conductor is eliminated.

Description

Technical Field

[0001] The invention belongs to the technical field of cable manufacturing, and in particular relates to a method for using a color ribbon. Background Art

[0002] In the cable industry, cables typically use different colors to identify the insulation cores. In recent years, to avoid the inconvenience of frequent plastic insulation changes, color-coded markings have gradually been adopted. However, current color-coded markings are extruded onto the conductor during manufacturing to identify the cores. This simplifies the production process and improves efficiency. Current color-coded markings do not share stress (tension) on the conductors. That is, they are completely stress-free during the various manufacturing steps (insulation, cabling, armoring, and jacketing). To improve cable manufacturing and prevent tension (tension) from affecting the conductors during manufacturing, leading to thinning (conductor diameter fluctuations), measures such as wire accumulators, active pay-off motors, and constant-tension motors are required to maintain constant tension. This prevents conductor diameter fluctuations, which can cause resistance fluctuations that can lead to product failures and, in the case of data cables, increased signal loss. This precise control system requires significant investment. During the initial stages of shutdown and startup, acceleration inevitably causes tension (traction) fluctuations, which in turn cause wire diameter fluctuations, leading to resistance fluctuations. This increases signal attenuation in communication cables and results in a certain amount of scrap. Small cable manufacturers cannot afford this precise control system, resulting in low-quality products. Especially for small-section wires, resistance fluctuations in the installation line can easily result in substandard products. This present invention eliminates the significant signal attenuation caused by conductor diameter fluctuations and resistance fluctuations through a simple and inexpensive technical approach. Summary of the Invention

[0003] The present invention aims to provide a simple and inexpensive technical method to prevent cable conductors from experiencing tension (traction) fluctuations, which in turn cause conductor diameter fluctuations, leading to resistance fluctuations and increased signal attenuation. During cable conductor insulation extrusion (or wrapping), the cable conductor and high-strength ribbon are first securely tied together with a small rope. The rope is then passed through the extruder's die core and sleeve, and then securely connected to the extrusion line's pull rope. The conductor payoff spool is adjusted to a low tension, while the high-strength ribbon payoff spool is adjusted to a high tension. The extruder and pull rope are then started. The cable conductor and high-strength ribbon are tightly together, pulled together by the extruder's pull rope, and then wrapped with insulating plastic through the extruder. The insulation passes through a cooling water trough, and then winds around a pull wheel and is transferred to a take-up reel. Throughout the entire production process, the high-strength ribbon bears the majority of the tension (traction) and propels the cable conductor forward. This can be considered as the conductor being attached to the high-strength ribbon, dragging the cable conductor forward. This prevents tension fluctuations on the cable conductor and eliminates excessive signal attenuation in the communication cable caused by large resistance fluctuations and fluctuations in the cable conductor's diameter. These operations can be performed using a standard wire extrusion line. This eliminates the need for wire accumulators, active pay-off motors, constant tension motors, and the high investment required for a precise control system. During subsequent cable manufacturing processes—cabling, sheathing, armoring, and sheathing—the prestressed ribbon maintains a constant tension on the cable conductor, preventing subsequent conductor thinning, large diameter fluctuations, and consequent resistance fluctuations. In the case of communications cables, this prevents significant signal attenuation. DETAILED DESCRIPTION

[0004] The present invention is described in detail below with reference to an embodiment, which includes the following steps: (1) The extruder is adjusted to a state suitable for extruding insulating plastic (including suitable temperature, mold core, mold sleeve, etc.), and the cable conductor and high-strength ribbon reel are placed on two pay-off racks respectively. (2) The cable conductor and high-strength ribbon are firmly tied together with a small rope, passed through the extruder mold core and mold sleeve in turn, and then firmly connected to the extrusion production line traction rope. The conductor pay-off shaft is adjusted to a smaller tension, while the pay-off tension of the high-strength ribbon shaft is adjusted to a larger tension. (3) The extruder is started and the traction is started. The cable conductor and the high-strength ribbon are tightly attached together and, under the drag of the traction rope, are extruded through the extruder mold to extrude the insulating plastic, pass through the cooling water tank, and are wound around the traction wheel to the take-up reel, continuously producing the insulated wire core with prestressed ribbon. (4) Multiple insulated wire cores containing prestressed ribbon are then subjected to cabling, inner sheathing, armoring (if any), and outer sheathing processes to obtain the final cable (containing prestressed ribbon) product.

Claims

1. A special prestressed ribbon used in the cable manufacturing process, characterized in that: The ribbon is pre-stressed with a large stress during the cable manufacturing process, so that the small-section conductor can be prevented from being thinned (or the wire diameter fluctuates) during the processes of extruding insulation, cabling and extruding outer sheath, thereby eliminating the resistance fluctuations caused by this, the increased attenuation of communication cable signals and other adverse consequences.

2. The method according to claim 1, wherein: The prestressed ribbon is tightly attached to the cable conductor and is insulated by extrusion (or wrapping).

3. The prestressed ribbon according to claim 1, characterized in that: The prestressed ribbon is pre-stressed with a certain stress and is tightly attached to the cable conductor, sharing the traction required for the conductor to move forward, greatly reducing the tension (traction) on the conductor, and eliminating resistance fluctuations caused by conductor wire diameter fluctuations and increased communication cable signal attenuation.

4. The prestressed ribbon according to claim 1, characterized in that: The prestressed ribbon is generally colored and used to identify the cable core, including the use of colorless prestressed ribbons which are also within the scope of this patent.