In the production process of connectors, the injection molding temperature determines the melting state of raw materials. The appropriate temperature is the key to ensuring the structural quality of connectors, while excessively high temperatures can have a negative impact on connectors.
Degradation: Plastic materials are prone to degradation at high temperatures. This means that the molecular structure is disrupted, leading to a decrease in material properties. This is usually manifested as a change in plastic color, an increase in plastic hardness, and a decrease in plastic toughness.
Phase transition: Some plastics change their crystal structure at high temperatures. For example, polypropylene (PP) will transform from an equiaxed crystal system to a rhombic crystal system at high temperatures, resulting in a decrease in its properties.
Decomposition: High temperatures can also cause the decomposition of plastics. For example, polyethylene (PE) decomposes into low molecular weight polymers at high temperatures, which can have a negative impact on the structural stability of connectors.
Dimensional changes: Due to the expansion of materials caused by high temperatures, high processing temperatures for injection molded high-pressure joints can cause changes in connector dimensions. Causing the product to not match the mold, affecting its use.
Internal stress: The uneven cooling rate of plastic injected into the mold at high temperatures can lead to the generation of internal stress. These internal stresses can easily cause shrinkage cracks and deformation on the surface of the connector.
Surface quality: The flowability of plastic will change under high temperature, which may cause flow marks or reduced glossiness on the surface of the connector.
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