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More than 30 years of research and development of high quality electric cables

2020-09

Basic Principles of Plastic Extrusion

The main insulation material and protective layer material of plastic wires and cables is plastic. Thermoplastics have superior performance and excellent processing performance, especially in the production of extruded insulation and protective layers for wires and cables, where the process is simple. The basic method of producing plastic insulation and protective layers for wires and cables is to use a single screw extruder for continuous extrusion. Due to the continuous extrusion characteristic of the extruder, the production process of plastic insulation and sheath is also continuous. In terms of wire and cable production, differences in product specifications and extrusion components often determine certain changes in extrusion equipment and process parameters. However, overall, the extrusion coating process for various products and components is similar and slightly different. Below, the extrusion principle, process, and mold type will be introduced with general principles as the main focus and individual examples as auxiliary.

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2020-09

Distinguishing plastic methods

Distinguishing plastic methods LDPE (Chinese name: Low Density High Pressure Polyethylene): Sensory identification: Soft to the touch: White and transparent, but with average transparency, often with adhesive tape and printed words. (Note: Tape and printed words are inevitable, but their content must be controlled as these will affect prices in the market) Combustion identification: The combustion flame is yellow above and blue below; When burning, there is no smoke, a smell of paraffin, melting and dripping, and easy to wire.

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2020-08

Classification and Common Product and Material Standards for Wire and Cable Inspection

1. Classification of test types (1) Type test (symbol T): According to general commercial principles, a test is conducted on a type of cable specified in the standard before supply to prove that the cable has good performance and can meet the specified usage requirements. The essence of type testing is that once these tests are conducted, there is no need to repeat them. If changing the cable material or design will affect the performance of the cable, it must be repeated. (2) Sampling test (symbol S): Conduct tests on finished cable samples or on components taken from finished cables to prove that the finished cable product meets the design specifications. (3) Routine test (symbol R): refers to the test that must be carried out before the finished cable leaves the factory. It should be carried out 100%.

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2020-08

What are fire-resistant cables and what standards are used for classification

In China, ordinary fire-resistant cables are divided into Class A and Class B: Class B cables can withstand combustion for at least 90 minutes under a flame and rated voltage of 750 ℃ to 800 ℃ without being broken down (i.e., the 3A fuse does not blow)

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2020-07

How to distinguish between fire-resistant cables and flame-retardant cables

Fireproof wires and cables are usually divided into two types: fire-resistant wires and cables and flame-retardant wires and cables, which are the general term for wires and cables with fire resistance performance. The following describes how to distinguish between these two types of cables.

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2020-07

How to distinguish between good and bad cables?

Method of distinguishing between good and bad cables

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2020-05

Is it better to use single stranded wires or multi stranded wires

1、 The difference between single and multi stranded wires Actually, it is easy to understand literally that each wire of a single stranded wire is composed of a single thick wire, also known as a hard wire; And each wire with multiple strands is a wire composed of multiple thin copper wires, also known as a flexible wire.

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2020-04

Domestic high-voltage cable insulation materials promote quality improvement in the cable industry

The power grid extensively uses high-voltage cross-linked cables, and it is necessary to support the use of domestically produced high-voltage cable insulation materials. This is the future development direction of high-voltage cable materials, "said Yang Liming, the chief expert of cables at the State Grid Electric Power Research Institute. Only by breaking through technological difficulties, developing new materials, truly realizing the localization of high-voltage cable insulation materials, and meeting the demand of the high-voltage cable market, can we promote the comprehensive quality development of the high-voltage cable industry.

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