Material Analysis
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Creep Deformation of Biaxially Oriented Polypropylene Film Products
Problem Phenomenon
The product undergoes slow deformation under long-term sustained load, affecting long-term use performance and dimensional stability.
Cause Analysis
(1) Biaxially oriented polypropylene film is an amorphous material, and slow creep still occurs below the glass transition temperature
(2) The product bears a sustained load; the longer the time, the greater the deformation
(3) The service environment temperature is high, accelerating creep
(4) The wall thickness of the product is insufficient, and the stress per unit area is large
(5) The molecular weight of the material is low, and the creep resistance is poor
Solution
(1) Increase the wall thickness of the product or add reinforcing ribs to reduce the stress per unit area
(2) Select a high molecular weight grade to improve creep resistance
(3) Reduce the service temperature and stay away from the glass transition temperature
(4) Consider the amount of creep during design and reserve a deformation allowance
(5) Add glass fiber reinforcement when necessary
Key Takeaway
Creep is the slow deformation of amorphous materials under sustained load.
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