Analysis and solution of common problems in blowing film (5 (injection molding products)

5, the film thickness is not uniform

Reason 1: The uniformity of the die gap directly affects the uniformity of the film thickness, if the die gap is not uniform, some parts of the gap is larger, some parts of the gap is smaller, resulting in more or less extrusion volume, therefore, the formed film thickness is inconsistent, some parts are thin, some parts are thick;

Reason 2: The temperature distribution of the die is uneven, with high and low, so that the thickness of the film after blowing is uneven;

Reason 3: The air supply volume around the cooling air ring is inconsistent, resulting in uneven cooling effect, so that the thickness of the film is uneven;

Reason 4: The blowing ratio and traction ratio are inappropriate, making the thickness of the membrane bubble difficult to control;

Reason 5: The traction speed is not constant and constantly changes, which of course will affect the thickness of the film.

solution
① Adjust the head die gap to ensure uniform everywhere;

② Adjust the temperature of the die of the head to make the temperature of the die part uniform;

(3) Adjust the cooling device to ensure uniform air output of the outlet;

(4) Adjust the blowing ratio and traction ratio;

⑤ Check the mechanical transmission device to keep the traction speed constant.