Warm Global Customers
With China Plastic Machinery
With China Plastic Machinery
Cables are a general term for optical cables, electrical cables, and other items. Cables have many uses, mainly for controlling installation, connecting equipment, transmitting electricity, and other multiple functions. They are common and indispensable in daily life. Since cables are charged, they need to be installed with special care.
RVVP: Copper core PVC insulated shielded PVC sheathed flexible cable voltage 300V/300V 2-24 core
Application: instruments, meters, intercom, monitoring, control installation
RG: Physical foamed polyethylene insulated access network cable
Application: Transmission of data analog signals in coaxial fiber hybrid network (HFC)
UTP: Local area network cable
Application: Transmission of telephone, computer data, fire prevention, anti-theft security system, intelligent building information network
KVVP: PVC sheathed braided shielded cable
Application: Signal transmission, control and measurement of electrical appliances, meters and power distribution devices
SYWV (Y), SYKV: Cable TV, broadband network special cable
Structure: (coaxial cable) single oxygen-free round copper wire + physical foamed polyethylene (insulation) + (tin wire + aluminum) + Polyvinyl chloride (polyethylene) RVV (227IEC52/53): polyvinyl chloride insulated soft cable Application: household appliances, small electric tools, instruments and power lighting AVVR: polyvinyl chloride sheath Application: soft cable for installation SBVV HYA: data communication cable (indoor and outdoor) Application: connection of telephone communication and radio equipment and connection of junction box of telephone distribution network RV, RVP: polyvinyl chloride insulated cable RVS, RVB: parallel or twisted multi-strand soft wire Application: cable for connection of household appliances, small electric tools, instruments, meters and power lighting BV, BVR polyvinyl chloride insulated cable Application: suitable for fixed wiring of electrical instruments and power lighting RIB speaker connection line (fever line) KVV PVC insulated control cable
Use: signal transmission, control and measurement of electrical appliances, instruments and power distribution devices
SFTP twisted pair transmission telephone, data and information network
UL2464 computer connection cable
VGA monitor cable
SYV coaxial cable for transmitting radio frequency signals in wireless communication, broadcasting, monitoring system engineering and related electronic equipment (including integrated coaxial cable)
SDFAVP, SDFAVVP, SYFPY coaxial cable, dedicated for elevators
JVPV, JVPVP, JVVP copper core PVC insulated and sheathed copper wire braided electronic computer control cable
N-agricultural cableL-aluminum coreV-PVCH-rubber sheathCY-charged0-none
V-PVC plastic insulated cable
X-rubberF-chloroprene rubber sheathD-no drip1- 1-Fiber layer
X-Rubber insulated cable
Y-PolyethyleneL-Aluminum sheathF-Phase-split sheath2-Double steel tape2-PVC sheath
YJ-Cross-linked polyethylene insulated cableQ-Lead sheathP-Oil-poor dry insulation3-Fine round steel wire3-Polyethylene sheath
ZQ-Paper insulated cableV-Polyvinyl chlorideP-Shield4-Thick round steel wire
Y-Polyethylene sheathZ-DC
1. The wiring number is used as the nominal: such as 18AWG or 16AWG.
2. Conductor colour codes Conductor colour nominal: L: Live (hot) Black N: Neutral White E: Earth (ground) Green Fourth conductor Red Fifth conductor Yellow Sixth conductor Orange
Square millimeters as nominal: such as 0.75mm2 2. Conductor colour codes Conductor colour nominal: L: Live (hot) Brown N: Neutral Blue E: Earth (ground) Green/Yellow
single core flexible cord TF twin-twisted flexible cord FF flat flexible cord
CTF cabtyre cord
K oval Oval
H heat-resistant insulation
The cable is mainly made of PVC plastic particles, sheath insulation and various specifications of copper wire twisted into cables
I. Process characteristics of wire and cable product manufacturing:
1. Long-length continuous superposition combination production method
The long-length continuous superposition combination production method has a global and controlling impact on the production of wires and cables, which involves and affects:
(1) Production process and equipment layout
The various equipment in the production workshop must be reasonably arranged according to the process required by the product, so that the semi-finished products at each stage can flow in sequence. Equipment configuration should consider the different production efficiencies and balance the production capacity. Some equipment may have to be configured with two or more units to balance the production capacity of the production line. Therefore, the reasonable selection and combination of equipment and the layout of the production site must be balanced and comprehensively considered based on the product and production volume.
(2) Production organization and management
Production organization and management must be scientific, reasonable, thorough, accurate, strict and meticulous. Operators must strictly follow the process requirements. Any problem in any link will affect the smooth process flow, product quality and delivery. Especially for multi-core cables, if a certain line pair or basic unit is short or has quality problems, the entire cable will be insufficient and scrapped. On the contrary, if a certain unit is too long, it must be sawed off, resulting in waste.
(3) Quality management
The production method of long-length continuous superposition and combination means that any problem in any link or instant in the production process will affect the quality of the entire cable. The more quality defects occur in the inner layer and are not discovered in time and production is terminated, the greater the loss will be. Because the production of wires and cables is different from assembled products, which can be disassembled and reassembled and replaced with other parts; the quality problems of any component or process of wires and cables are almost irreparable and irreparable for this cable. The subsequent treatment is very negative, either sawing it short or downgrading it, or scrapping the entire cable. It cannot be disassembled and reassembled.
The quality management of wires and cables must run through the entire production process. The quality management inspection department should conduct patrol inspections of the entire production process, self-inspections by operators, and mutual inspections between upper and lower processes. This is an important guarantee and means to ensure product quality and improve the economic benefits of the enterprise.
2. There are many production processes and large material flows
The manufacturing of wires and cables involves a wide range of processes, from the smelting and pressure processing of non-ferrous metals to chemical technologies such as plastics, rubber, and paints; textile technologies such as wrapping and weaving of fiber materials, to wrapping of metal materials and longitudinal wrapping of metal strips, welding of metal forming processes, etc.
The various materials used in the manufacture of wires and cables are not only of many categories, varieties, and specifications, but also of large quantities. Therefore, the amount, spare amount, batch cycle, and batch size of various materials must be verified. At the same time, the decomposition, recycling, reuse, and treatment of waste products are an important part of management, and material quota management and attention should be paid to conservation.
In the production of wires and cables, from the entry and exit, storage of raw materials and various auxiliary materials, the flow of semi-finished products in each process to the storage and delivery of products, the material flow is large, and it must be reasonably laid out and dynamically managed.
3. Many special equipment
Wire and cable manufacturing uses special production equipment with the process characteristics of this industry to adapt to the structure and performance requirements of cable products, and meet the requirements of long-length continuous and as high-speed production as possible, thus forming a series of special equipment for cable manufacturing. Such as extruder series, wire drawing machine series, stranding machine series, wrapping machine series, etc.
The manufacturing process of wires and cables is closely related to the development of special equipment and promotes each other. New process requirements promote the generation and development of new special equipment; in turn, the development of new special equipment improves and promotes the promotion and application of new processes. Special equipment such as wire drawing, annealing, extrusion series line; physical foaming production line, etc., promote the development and improvement of wire and cable manufacturing technology, and improve the product quality and production efficiency of cables.
2. Main processes of wires and cables
Power cables
Wires and cables are made through three processes: drawing, twisting, and wrapping. The more complex the model and specifications, the higher the repeatability.
1. Drawing
In metal pressure processing. Under the action of external force, the metal is forced through the die (pressing wheel), the metal cross-sectional area is compressed, and the technical processing method of obtaining the required cross-sectional area shape and size is called metal drawing.
The drawing process is divided into: single wire drawing and twisting drawing.
2. Twisting
In order to improve the softness and integrity of wires and cables, interweaving more than two single wires in a specified direction is called twisting.
The twisting process is divided into: conductor twisting, cabling, braiding, steel wire armoring and winding.
3. Wrapping
According to the different performance requirements of wires and cables, special equipment is used to wrap different materials on the outside of the conductor. The coating process is divided into:
A. Extrusion: rubber, plastic, lead, aluminum and other materials.
B. Longitudinal packaging: rubber, corrugated aluminum strip materials.
C. Wrapping: ribbon-shaped paper tape, mica tape, alkali-free glass fiber tape, non-woven fabric, plastic tape, etc., linear cotton yarn, silk and other fiber materials.
D. Dipping: insulating paint, asphalt, etc.
III. Basic process flow of plastic wire and cable manufacturing
1. Copper and aluminum monofilament drawing
The copper and aluminum rods commonly used in wires and cables are reduced in cross section, increased in length and improved in strength by using a wire drawing machine to pass through one or several drawing die holes at room temperature. Wire drawing is the first process of each wire and cable company, and the main process parameter of wire drawing is die matching technology.
2. Single wire annealing
When copper and aluminum single wires are heated to a certain temperature, they are recrystallized to improve the toughness of the single wires and reduce the strength of the single wires to meet the requirements of wires and cables for conductive cores. The key to the annealing process is to prevent the oxidation of copper wires.
3. Conductor twisting
In order to improve the softness of wires and cables and facilitate laying and installation, the conductive core is made of multiple single wires twisted together. From the twisting form of the conductive core, it can be divided into regular twisting and irregular twisting. Irregular twisting is further divided into bundle twisting, concentric twisting, special twisting, etc.
In order to reduce the occupied area of the wire and reduce the geometric size of the cable, the conductor is twisted and compressed at the same time, so that the ordinary circle is transformed into a semicircle, fan-shaped, tile-shaped and compressed circle. This kind of conductor is mainly used in power cables.
4. Insulation extrusion
Plastic wires and cables mainly use extruded solid insulation layers. The main technical requirements for plastic insulation extrusion are:
4.1. Eccentricity: The deviation value of the extruded insulation thickness is an important indicator of the extrusion process level. Most product structural dimensions and their deviation values are clearly specified in the standards.
4.2. Smoothness: The surface of the extruded insulation layer must be smooth, and there must be no poor quality problems such as rough surface, burning, and impurities
4.3. Density: The cross-section of the extruded insulation layer must be dense and solid, and there must be no pinholes visible to the naked eye, and no bubbles.
5. Cabling
For multi-core cables, in order to ensure the degree of molding and reduce the shape of the cable, it is generally necessary to twist them into a round shape. The twisting mechanism is similar to the conductor twisting. Due to the large twisting section diameter, most of them adopt the non-back-twist method. The technical requirements for cabling are: first, to prevent the twisting of the cable caused by the turning over of the special-shaped insulation core; second, to prevent the insulation layer from being scratched.
Most cables are accompanied by the completion of two other processes during cabling: one is filling to ensure the roundness and stability of the cable after cabling; the other is binding to ensure that the cable core is not loose.
6. Inner sheath
In order to protect the insulation core from being scratched by the armor, the insulation layer needs to be properly protected. The inner sheath is divided into: extruded inner sheath (isolation sleeve) and wrapped inner sheath (cushion). The wrapped cushion replaces the binding tape and is carried out simultaneously with the cabling process.
7. Armoring
Cables laid underground may be subjected to a certain amount of positive pressure during work, and an inner steel belt armor structure can be selected. Cables laid in places where there are both positive pressure and tension (such as in water, vertical shafts or soil with a large drop), a structure with inner steel wire armor should be selected.
8. Outer sheath
The outer sheath is a structural part that protects the insulation layer of wires and cables from erosion by environmental factors. The main function of the outer sheath is to improve the mechanical strength of wires and cables, prevent chemical corrosion, moisture, water immersion, and prevent cable combustion. According to different requirements for cables, the plastic sheath is directly extruded using an extruder.
Model nameScope of use
VV VLV PVC insulated PVC sheathed power cable is laid indoors, in pipelines, and in tunnels
VV VLV PVC insulated polyethylene sheathed power cable is laid indoors, in pipelines, and in tunnels
VV22 VLV22 PVC insulated steel belt armored PVC sheathed cable is laid underground and can withstand mechanical external forces
VV23 VLV23 PVC insulated steel belt armored polyethylene sheathed cable
1. Video cable The distance between the camera and the monitoring host is ¡Ü200 meters, use RG59 (128 braid) video cable. The distance between the camera and the monitoring host is >200 meters, use SYV75-5 video cable. 2. PTZ control cable The distance between the PTZ and the controller is ¡Ü100 meters, use RVV6¡Á0.5 sheathed cable. If the distance between the PTZ and the controller is > 100 meters, use RVV6¡Á0.75 sheathed wire. 3. The lens control line uses RVV4¡Á0.5 sheathed wire. 4. The decoder communication line should use RVVP2¡Á1 shielded twisted pair wire. 5. If the camera power line has 20 ordinary cameras in the system and the average distance from the camera to the monitoring host is 50 meters, use BVV6m copper core double plastic wire as the main power line.
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