Stretch film is widely used in industrial production. The most effective protection of stretch film for products is its most basic function. If stretch film does not have a reliable maintenance function for packaged goods, then it will lose its application as a packaging product. The value of this is a failure in the selection of materials.
The maintenance function of stretch film for goods is also diverse. Different commodities have different packaging methods, and the focus on the maintenance function of stretch film is different.
Let me introduce the main functions of stretch film:
1. Good mechanical maintenance effect
Good mechanical maintenance effect, avoiding the leakage of the goods in the package or the damage or contamination of the goods caused by foreign matter entering the package, which can directly reflect the mechanical maintenance function of the stretch film. The higher the strength of the stretch film, the stronger the tear resistance. The greater the puncture resistance, the better its curing effect.
2. Adhesion strength
Good bonding strength is also a necessary condition for the stretch film to reliably maintain the product. If the bonding strength is insufficient, the gap will become a fatal defect of the stretch film, and the stretch film will lose the maintenance effect of the goods due to the damaged packaging.
Ordinary biaxially oriented polypropylene film has good mechanical strength, but because of its poor adhesion function, biaxially oriented polypropylene film is generally not used for bag making.
When you need to make bags, you need to choose a stretched film based on a biaxially oriented polypropylene film containing a heat-sealing layer. The bonding function of the stretched film is usually expressed by the bonding strength, that is, N/15mm. The higher the strength, the better the bonding function.
3. Other features
Among the other functions of product maintenance, isolation and shading are most needed.
Isolation refers to the effect of stretching the film to avoid oxygen, carbon dioxide, nitrogen and other gases, as well as water vapor and other substances. When the scope is not clear, it generally refers to the isolation of oxygen, carbon dioxide, nitrogen and other non-polar gases. For many products, Especially for food, the heat preservation function of stretch film is an important factor for long-term effective storage of packaged goods. Different products have different requirements for the insulation function of the stretch film.
The light-shielding property of stretch film is also very important for the packaging of some commodities, especially ultraviolet light, which is an important reason for the discoloration, fading, and photo-oxidation of certain substances. It needs to pay attention to the light-shielding property through the transmittance of a given wavelength. To measure, the higher its light transmittance, the worse its shading.
Joypack is a professional packing products production enterprises with rich experience.Our main products include: PP & PET strap, PE stretch film, BOPP adhesive tape, PE tying tape and other packing materials. We has got ISO9001, German tuv-site and SGS certifications. welcome to contact us.
