Extruder temperature

Blow molding low density polyethylene (LDPE) film, kneading temperature 160℃~

Between 170 ℃, the general inhibition and necessary to ensure the average nose temperature, kneading temperature, resin after high simple decomposition, film brittleness, especially longitudinal stretching strengthFalling; low plasticizing temperature, resin, after reduction means soft expansion, The tensile strength of the film is low, the appearance is poor gloss brightness, and even appears streaked like wood rings and no ablated nuclei (fish eyes).

Destruction ratio

The ratio is a control point of blowing during the blown film production process, which refers to the share of the film diameter after blowing the foam diameter and not blowing it between the pipe circles.

The lateral expansion ratio and the blowing ratio of the film were carried out before the film was stretched laterally, and the plastic molecules had to be stretched horizontally, and the share of the orientation effect was increased, so that the film of blown lateral strength was advanced.

However, the blow ratio also means that it is not too big, not simply that the film foam is not the same, the film is very easy to suffer.

Therefore, the blowingThan and traction ratio are common, normal, and the low-density polyethylene (LDPE) film blowing ratio is probably moderate at 2.5 to 3.0.

Traction ratio

Traction Traction ratio refers to the share between the film speed and the tube ring kneading speed.

Drawing share is the longitudinal stretch ratio that enables the film to have an orientation effect.

Addition of draw ratio, longitudinal strength and advance, film thickness

The thickness of the film becomes thinner, but if the traction ratio is too large, the thickness of the film is difficult to control, and the film may even be pulled off, resulting in a broken film. The traction ratio of low density polyethylene (LDPE) film is preferably between 4 and 6.