Analysis of medium voltage XLPE insulated power cable shielding

Shielding plays an important role in medium voltage cross-linked polyethylene. It can improve the uniformity of electric field distribution. According to the standard understanding, shielding is divided into non-metallic shielding (conductor shielding, insulation shielding) and metal shielding (copper tape, copper wire).

2022-05-13

How to repair the local defects of wire and cable insulation sheath under the analysis of three-layer co-extrusion head?

The use of wire and cable we will often encounter insulation rupture or local defects, then, encounter these problems should be how to solve it?

2022-05-13

Preparation of three-layer co-extrusion dry cross-linked cable production line before start-up

Preparation of three-layer co-extrusion dry cross-linked cable production line before driving: The upper and lower closing pads and molds are prepared according to the cable specifications produced by the (I) selection of the closing pad and the mold, and installed in the extruder. (II) extruder heating and heat preservation In order to make the temperature of the extruder meet the process requirements, the start-up heating time shall not be less than 3-4 hours.

2022-05-13

The role of rubber sleeve extruder

Sealing strip manufacturers should be cautious when purchasing equipment, and the choice of equipment depends on the cost performance of the equipment. It depends on the configuration of the equipment and the market share of the equipment. The stability of the sealing strip equipment is very important in production. Without a stable equipment production, there is no way for the manufacturer's profit and product quality.

2022-05-13

Development Process of Plastic Extruder

The extruder originated in the 18th century. The manual piston extruder made by the JosehBramah of England in 1795 for the manufacture of seamless lead pipes is considered to be the world's top extruder. Since then, in the first 50 years of the 19th century, extruders were basically only used in the production of lead pipes, the processing of macaroni and other foods, and the brick and ceramic industries.

2022-05-13

Extrusion system for plastic extruder

The extrusion system includes a screw, a barrel, a hopper, a head, and a die. The plastic extruder plastic is plasticized into a uniform melt by the extrusion system, and is continuously extruded by the screw under the pressure established in this process.

2022-05-06

Plastic extruder automation level to improve

The end of the manual era plastic extruder automation level. At present, China's plastic extruder market is developing rapidly, and many new models have been launched. Through the joint efforts of technology and personnel in the industry, some major models such as exhaust extruder, tandem disc screw extruder, reciprocating pin screw extruder, foaming extruder, extruder with melt gear pump, tandem multi-stage extruder, planetary screw extruder, etc. are all produced by domestic manufacturers, with independent capabilities and independent intellectual property rights.

2022-05-06

Plastic extruder operation maintenance

Each type of product in the plastic extruder has its operating characteristics, and a detailed understanding of its operating characteristics can give full play to the efficiency of the machine. Plastic extruder is one of the types and its, grasp the operation points of the extruder, the correct and reasonable use of the extruder. The use of screw extruder includes a series of links such as installation, adjustment, commissioning, operation, maintenance and repair of the machine. Its use has the commonality of general machines, mainly in the drive motor and reduction gear. However, the working system of the screw extruder is the extrusion system, but it is characterized, and special attention should be paid to its characteristics when using the screw extruder.

2022-05-06

Heat generation in the extrusion production process of the extruder

Extruder in the extrusion production process of heat generation (heating) external heating is currently commonly used in the extruder is electric heating, but also a relatively clean, easy to control the heating method. (Of course, there are heat transfer oil, electromagnetic induction, etc., not discussed here.) That is, the electric heater (with resistance wire) is packaged on the barrel, and the material is heated and melted due to the joint action of heat conduction, convection and radiation.

2022-05-06

Extruder deceleration principle

Extrudable plastics are thermoplastics which melt when heated and solidify again when cooled. Where the heat of melting plastic comes from. Feed preheating and barrel/die heaters may play a role and are very important at start-up, but the motor input energy-the frictional heat generated in the barrel when the motor rotates the screw against the resistance of the viscous melt-is an important heat source for all plastics, except small systems, low-speed screws, high melt temperature plastics and extrusion coating applications.

2017-06-06