Stretch Film Wrap Quality can be judged from the following aspects:

1. Tackiness: Tackiness mainly refers to the adhesion between two layers of film, indicating the stickiness of the stretch wrap film in either stretched or unstretched states.

2. Elastic Recovery: Expressed as a percentage, it refers to the ratio of the recovered dimension to the original dimension after the stretch wrap film has been stretched by a certain proportion.

3. Elongation: For stretch wrap film stretched by a certain proportion, it is the ratio of the increased length to the original length, expressed as a percentage. The tensile force at a predetermined elongation rate can be represented by the force value F in physics.

4. Tensile Retention: Expressed as a percentage, it indicates the ratio of the tensile force maintained by the stretch wrap film after being stretched by a certain proportion to the initial F force value.

5. Puncture Resistance: This tests the ability of the stretch wrap film to resist needle penetration, which can be indicated by the force and displacement experienced when the film ruptures during piercing.

6. Light Transmittance and Haze: Can be tested according to GB/T 2410-1980 for the light transmittance and haze of stretch wrap film. This is currently a widely used method by many companies and is a very important method for testing the transparency of stretch wrap film.

Article Title: Stretch Wrap Films URL: https://en.szxylp.com/eco-friendly-stretch-films/stretch-wrap-films.html