9, the film longitudinal tensile strength is poor
Reason 1: The temperature of the molten resin is too high, which will reduce the longitudinal tensile strength of the film;
Reason 2: The blowing ratio is too large and does not match the traction ratio, so that the transverse orientation and tensile strength of the film are increased, and the longitudinal tensile strength will become worse;
Reason 3: The traction speed is slow, and the longitudinal orientation of the film is not enough, so that the longitudinal tensile strength becomes worse.
Reason 4: The cooling speed of the film is too fast;
solution
① Appropriately reduce the temperature of the molten resin;
② Increase the traction speed appropriately;
(3) Adjust the blowing ratio to adapt to the traction ratio;
④ Reduce the cooling speed appropriately.
Analysis and solution of common problems in blowing film (9(injection molding products)
2023 12/09