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2.1 Fragment of the cover

The sheath is part of the connector, and its ingredients are mostly polymer engineering plastics. Common materials include nylon, polypropylene, polytinyl -borne -borne glycol (PBT), etc. The main function of the sheath is to bear the fixed support and insulation protection of the terminal. Therefore, the protective cover itself must have sufficient strength to meet support and protection, but also have sufficient toughness to meet the needs of connectors installation and disassembly. The molecular chain of polymer materials is generally more sensitive to the external environment. For example, the strength of nylon materials in the damp and heat environment will be significantly reduced, and the toughness will be greatly enhanced. This is easy to occur in the problem of unqualifying power of terminals in the protective cover. In a dry and cold environment A significant decline, at this time, it is easy to break.

The form of the connector is mainly manifested by the crispy break of the bending part of the connector. As a result of a common sheath hinge in the process of turning (Figure 1). The main factors of broken breaks generally include the following.

1) The moisture content of protective cover materials exceeds the standard. Polymer materials have strict water content requirements, so standardized baking operations must be performed before injection production. The purpose is to make the material meet a certain water content requirements. The probability of a break.

2) The injection molding temperature is not appropriate. Excessive injection molding temperature will cause breaks and reorganization of the molecular chain of polymer materials, change the original characteristics of the material, will also affect the toughness of the material, exacerbate the occurrence of product breaks.

3) The type of injection molding machine (displacement) does not match the product. Products with smaller injection molding machines with excessive displacement will cause the material to melt in the injection molding equipment for too long, resulting in degradation of the molecular chain of the material, changing the characteristics of the material, and reducing the performance of the material.

4) For hinge products, the length ratio of the length of the hinge is too small (Figure 2). During the folding process of the hinge, it will also break due to excessive stress at the hinge bend.

5) The low toughness of the raw materials itself will also exacerbate the risk of broken. For example, PBT materials are more likely to have broken defects due to the low toughness of their own materials. Therefore, when selecting the materials for the early stage of the connector, the product's use environment should be fully considered and the appropriate material should be selected.

Therefore, during the production process of connectors, it is necessary to strictly operate in accordance with the established production process. You must not change the production process and production equipment at will. At the same time, the product structure must be confirmed. The probability of broken.

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