Analysis and solution of common problems in blowing film (1 (injection molding products)

As a blown film manufacturer, it is a common phenomenon to replace the film formula and produce different specifications of film, and in this process, various emergencies and on-site blowing film for various reasons lead to quality problems. By collecting the most common faults and causes in the process of blowing film, Xiaobian provides reference for enterprises and technical personnel, so as to solve the problem and solve the production problem.

1, the film is too sticky, poor opening

Reason 1: The resin raw material model is not correct, not low-density polyethylene resin with blown film grade, which does not contain opening agent or the content of opening agent is low;

Reason 2: The temperature of the molten resin is too high, and the fluidity is too large;

Reason 3: The blowing ratio is too large, resulting in poor opening of the film;

Reason 4: The cooling speed is too slow, the film is not cooled enough, and mutual bonding occurs under the action of the traction roll pressure;

Cause 5: The traction speed was too fast.

solution

① Replace the resin raw materials, or add a certain amount of opening agent to the department;

(2) Appropriately reduce the extrusion temperature and resin temperature;

(3) Appropriately reduce the blowing ratio;

④ Increase the air volume, improve the cooling effect, and speed up the cooling speed of the film;

⑤ Reduce the traction speed appropriately.