Stretch film has high strength, high impact resistance and penetration strength, good self adhesiveness, transparency, and does not expand in volume after packaging. It is shockproof, moisture-proof, and has strong protective properties. It is a very popular packaging form in the world. Stretch wrap film is widely used for packaging products such as food, tobacco, and pharmaceuticals. Stretch film has many types and different functions. The packaging equipment that uses flexible packaging to package all or part of the product is called packaging. Polyethylene stretch film is one of the most important components in the packaging industry.
The use of stretch film packaging can greatly reduce the production cost of enterprises, lower the labor intensity of workers, improve packaging efficiency and packaging grade. Manual stretch film only requires a handheld unwinding rack with damping brake, which can be wrapped by one person and is lightweight and flexible. Machine stretch film is suitable for bulk packaging of goods. If used in conjunction with a winding machine, it will greatly improve production efficiency, make the packaging appearance uniform and beautiful, and ensure good and fast packaging quality.
During the transportation of the wrapping film, damage to the box can wear down the edges of the wrapping film, making it prone to breakage during use; During the process of opening the box, the user of the stretch wrap film cut the edge of the packaging film too deeply when cutting the opening tape, causing the packaging film to break when pulled. These are the reasons why the wrapping film is prone to breakage due to edge breakage. Therefore, in the process of using wrapped film, not only do manufacturers need to ensure the quality of the stretched film, but customers also need to protect the PE wrapped film from the influence of the wrapped film.
Stretch film does not require heat shrinkage treatment during the packaging process, which is beneficial for energy conservation, reducing packaging costs, facilitating container transportation, and improving logistics efficiency. The ‘loading and unloading’ method combines pallets with forklifts, reducing transportation costs, while high transparency makes packaged goods easy to identify and reduces delivery errors. Production process conditions: Due to the narrow and fast flow channel, the temperature range of the melt is generally controlled between 250~280, and the temperature of the casting film cooling roller is controlled between 20~30. The winding tension is low, generally within 10kg, to facilitate the migration of the adhesive and reduce the internal stress of the finished film.
There are many materials for wrapping film, mainly depending on the application of the product. To control the viscosity of the wrapping film, efforts can be made on the material. The wrapping film cannot be matched with all C4-LLDPE materials, and C6 and C8 materials are commonly used for processing.
Additionally, temperature can affect the viscosity of the wound film. We usually place the product in an environment of 15 to 25 degrees Celsius. When the temperature exceeds 30 degrees, the viscosity will increase; If it is below fifteen degrees, the viscosity will deteriorate again. Because there will be polyethylene in the wrapped film, we can adjust the amount of adhesive polyethylene to achieve the desired viscosity.