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How to Control the Quality of Non-armored Large Section Single Core Cable

Release time:

Oct 12,2019

With the fierce market competition and the continuous development of the wire and cable industry and the continuous improvement of users' awareness of the quality of cable products. The user's demand for cable products is not only a single product price and cost, but also pays more attention to the internal and external quality of the product. The required products not only require their inherent performance to meet the corresponding production technology standards (GB, JB, MT...), but also pay special attention to the appearance quality of the product, such as product appearance

How to Control the Quality of Non-armored Large Section Single Core Cable

With the fierce market competition and the continuous development of the wire and cable industry and the continuous improvement of users' awareness of the quality of cable products. The user's demand for cable products is not only a single product price and cost, but also pays more attention to the internal and external quality of the product. The required products not only require their inherent performance to meet the corresponding production technology standards (GB, JB, MT...), but also pay special attention to the appearance quality of the product, such as product appearance

There shall be no such undesirable phenomena as convex hull, concave points, scorched seeds, cold material bumps, rough wire drawing, and no pores in the profile. The occurrence of these undesirable situations will cause users to be dissatisfied with the batch of cables, and raise doubts about the quality of the company's products, which will often lead to user complaints or affect the corporate image and the impact on the corporate market. In this paper, the author combined with the treatment of non-armored large cross-section single-core cable outer sheath damage of a point of experience and.

Its experience in the actual production, for non-armored large cross-section single-core cable in the production process of quality problems, cause analysis and quality control put forward a superficial view.

Characteristics and Process Characteristics of Large Section Single Core Cable

Due to the existence of its own characteristics, large cross-section single-core cable has large cross-section, large proportion of metal materials, and relatively thin extruded sheath.

When extruding sheaths for large-section copper core single-core cables, 150 extruders are generally used to extrude sheaths. The production process is roughly as follows: insulation extrusion (including conductor shielding, insulation and outer shielding)-copper tape shielding-sheath extrusion.

From the structure and size table of large cross-section single-core copper core cross-linked cable and the extrusion production process, it can be seen that the sheath surface needs to be cooled after extrusion of the sheath. If the sheath is not cooled properly, the cable is easy to cause abnormal quality such as surface wrinkle, crack, surface deformation of cable sheath at the bottom of the disc, etc.

From the perspective of cable cooling and heat dissipation balance principle (Q discharge = Q suction = Q copper Q water Q) and in-depth analysis of production practice, generally speaking, even under the same production speed and the same cooling conditions, the armored type has better heat dissipation than the non-armored type, and its cooling effect is relatively better.

Cause Analysis of Product Quality Defects and Process Control Measures

In the process of producing large cross-section single-core cables, the main external quality defects are as follows: sheath wrinkle, hole, break, coke seed, cold material lump, rough wire drawing, multi-steam hole in cross-section, surface deformation of cable sheath at the bottom of the disc, natural inflation of loose sleeve after sheath head, and abrasion of sheath on the side of cable reel.

In addition, in the extrusion process, due to its falling down, even if the eccentric core is adjusted, the upper part is thick and the lower part is thin. At the same time, compared with the steel tape, the cooling effect of the copper tape is slower than that of the armored cable at the same extrusion speed. If the cooling water tank is not fully utilized during the extrusion of the product, the appearance of the product between the wire trays received after passing through the spark machine will not be abnormal

However, due to the randomness of the cable arrangement after receiving the cable reel, sometimes the cables on both sides of the cable reel will rub against the side of the cable reel. In addition, the cables in the inner layer of the cable bottom will rub. If the surface of the cable sheath is not cooled enough, the cable sheath will wrinkle, and in severe cases, the cables will be scratched due to rubbing.

For the quality problem of large cross-section single-core cable. The author believes that regardless of production and use, production enterprises, distributors and users are necessary to have an understanding of the characteristics and basic knowledge of cable laying, especially cable manufacturers need to strengthen the cause analysis and control from the product quality process, and constantly summarize the abnormal phenomena in production and analyze the causes to formulate control measures to reduce product quality defects and improve the internal and external quality of products.

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