The difference between one-way stretching and two-way stretching
Uniaxial stretching and biaxial stretching are two different technologies in material processing. They are used in various materials, such as plastics, polytetrafluoroethylene (PTFE), etc., to improve the physical and mechanical properties of the materials. Here are the differences between the two technologies:
One-way stretch:
Unidirectional stretching refers to the process of stretching only along the length direction of the board.
This process is relatively simple and suitable for use in experiments.
Stretching under high temperature and high speed conditions can rearrange the polymer chains along the stretching direction, thereby strengthening the bonding force between molecular chains and improving the strength of the material.
The elongation of uniaxial stretching is usually only 10% to 15% of the original sheet.
Application scenarios include geogrids, packaging of lightweight products such as disposable paper cups, etc.
Two-way stretch:
Two-way stretch:
Biaxial stretching refers to the process of stretching in two vertical directions (longitudinal and transverse) simultaneously or step by step at a certain temperature and set speed.
The properties of materials that have been biaxially stretched are greatly improved in both directions, and the comprehensive performance meets the needs of practical applications.
Biaxially oriented cigarette packet film (BOPP) is a multi-layer co-extruded film with good physical stability, mechanical strength, air tightness, high transparency and gloss, and is suitable for printing films, etc.
To sum up, the main difference between uniaxial stretching and biaxial stretching lies in the stretching direction and process. Uniaxial stretching is performed in only one direction, while biaxial stretching is performed in two perpendicular directions at the same time or in steps, so that the material has better properties in both directions.
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