PE stretch film production line product performance

Nanjing Sumino Precision Machinery Co., Ltd. is committed to the one-stop service of plastic extruder equipment. It has long-term stretch film, pe stretch film, lldpe stretch film production equipment research and development, production and manufacturing experience. Today we will learn about Nanjing Sumino Seiko pe winding The performance of the PE stretch film produced by the film production line. www.susumino.comCast film manufacturing equipment

The performance of PE stretch film

1. Pre-stretching performance and shrinkage

The performance of the wound film can be simply analyzed with the help of the stress-strain curve of the film. Stress-strain curve of PE stretch film. The midway yield point represents the elastic limit of the material. When the film is stretched, the load increases rapidly. When the yield point is exceeded, the film undergoes permanent deformation. In this plastic range, the stress-strain curve is generally flat. Finally, the tensile load continues to increase until it reaches rupture. until the point. www.susumino.comCast film manufacturing equipment

At the point of rupture, the load drops to zero. The stress-strain curve of the stretched film is similar to the stress-strain curve when stretching the rubber band, except that the yield point of the latter coincides with the rupture point. From the fact that the rubber band can tighten the package, it is not difficult to infer that the stretched film is stretched Finally, it can also wrap the package tightly. www.susumino.comCast film manufacturing equipment

When wrapping goods with wrapping film, wrapping film is generally pre-stretched before touching the goods, so that before the film wraps the goods, it is subjected to a constant stretching force and the stretching force is evenly distributed on the entire wide surface of the film. The pre-stretching rate can reach 200%-300%. Pre-stretching increases the strength of the film, and greatly improves the creep resistance at room temperature; in addition to good stretch performance, the stretch film also has good stretch retraction memory performance. The memory property makes a characteristic of polymer materials: the heat shrinkable film recovers memory and shrinks when it is heated; the second stretch film is pre-stretched at room temperature, which can produce elastic retraction function and use the elastic retraction function to hold the package tightly. Wrap it up. The shrinkage rate of the stretched film is different due to the different production conditions of the film (especially the different formulations), but they all increase with the increase of the stretching ratio. The shrinkage rate of the stretched film

Another indispensable and important property of stretch film is the self-adhesiveness of the film. When using a stretch film for stretch-wrap packaging, the self-adhesiveness of the film prevents it from slack after cutting, and can tightly wrap the goods for a long time.

2. Other common parameters of stretch film performance

1. Elongation at break

(1). Longitudinal elongation at break The film is sampled and stretched longitudinally to determine the elongation at break.

(2). Transverse elongation at break Take a sample of the film and perform transverse tensile elongation at break

(3). Total elongation = longitudinal elongation at break + transverse elongation at break. In general, the total elongation of the stretch film is close to 900%-1000%.

2. Elongation ratio Elongation ratio = longitudinal elongation at break/transverse elongation at break. The elongation ratio of stretch film is generally between 0.54 (350/650) and 1 (500/500).

3. Tension ratio The tension ratio indicates the ratio of the tensile strength of the film to the yield strength when it is stretched longitudinally (calculated from the stress-strain curve). The higher the tension ratio, the less likely the stretch film will break when stretched. The tension ratio of stretch film is generally (2~2.5):1, and the highest value can reach 5:1.

Nanjing Sumino Precision Machinery Co., Ltd. has a professional cast film production line. The company's main cast film production lines include: TPU hot melt adhesive film production line, CPP/CPE cast film production line, EVA solar energy packaging film production line, PE hygienic and breathable Film production line, PVDF cast film production line, PP three-dimensional film production line, medical blood purification film production line, multi-layer co-extruded barrier film production line, LLDPE stretch film production line, etc.