Analysis of the core differences between PE high-pressure bags and low-pressure bags

PE high-pressure bags and low-pressure bags are the two most commonly used categories in polyethylene packaging. The core difference lies in the production process, which determines the performance and application scenarios. Many people easily confuse the two. The key differences are summarized as follows.

In terms of process, high-pressure bags (LDPE) use 100-300MPa high-pressure high-temperature polymerization, while low-pressure bags (HDPE) use low-pressure medium temperature polymerization, which results in different molecular structures. In terms of performance, high-pressure bags are flexible, easy to stretch, have high transparency, fold without creases, and have good heat sealing properties but average strength; The low-pressure bag is relatively hard and firm, with strong tear and puncture resistance, better temperature resistance, and leaves creases when folded.

In terms of appearance and feel, the high-pressure bag has good glossiness, soft feel, and gentle rubbing sound; The low-pressure bag has a slight foggy feel, rough texture, and a rustling sound when rubbed. In terms of application, high-pressure bags are suitable for food preservation, daily chemical lining, etc; Low pressure bags are suitable for supermarket shopping bags, heavy-duty packaging, etc. Mastering these differences can accurately match procurement and usage needs, avoiding mismatches.