High density linear PP

One of the disadvantages of Polypropylene is its low melt strength and poor resistance to melt sagging. Amorphous polymers such as ABS and PS typically exhibit rubber like elastic behavior over a wide temperature range, while semi crystalline polypropylene does not. This disadvantage results in polypropylene not being able to be thermoformed over a wide temperature range. Its softening point and melting point are very close, and once it reaches the melting point, the viscosity of the melt drops sharply, leading to a significant decrease in melt strength. This results in uneven wall thickness of the product during thermoforming, as well as collapse of bubble holes when extruded, greatly limiting the application of polypropylene in certain areas. High melt strength polypropylene (HMSPP) refers to polypropylene whose melt strength is not very sensitive to temperature and melt flow rate, and has great development and application prospects Polypropylene