In the production process of stretched film, it is very important to control the viscosity and physical viscosity of the product. So how do we get these two properties? Today, the stretch film manufacturers will give you a detailed introduction:
- Stretch film to control the physical viscosity
Generally speaking, a higher transparency is conducive to the identification of goods, a high longitudinal elongation is conducive to stretching, and saves materials. Good longitudinal tear strength and puncture properties are conducive to the film will not break if it encounters sharp objects under high tension, the yield point is more confined. The price of MPE is also high. In order to reduce costs, everyone knows that the film produced by the casting method has high transparency. Most of the machined stretch films use c8 / c6 material. This material is easy to process and can meet various packaging requirements .
The density of the material also affects the performance of the film. As the density continues to increase, the degree of orientation increases, the flatness is good, the longitudinal elongation increases, and the yield strength increases, but the transverse tear strength, puncture strength, and light transmittance all decrease. Aspects of performance.
- Control of viscosity in the production of stretched film
The better the viscosity, the better the fusion of the packaging film layer on the surface of the goods. To obtain the viscosity, add a masterbatch called PIB or stretched film to the polymer. This material is a translucent viscous liquid that can be directly added by special equipment. Masterbatch for film stretching. The removal of the stretched film generally takes three days, and it is also affected by the temperature. The higher the temperature, the stronger the viscosity, and vice versa, the viscosity after stretching will be greatly reduced.
Primary products are generally stored within a certain range, so as to ensure that the performance of the stretched film will not be reduced. In one is to join VIDPE. The viscosity of this ingredient is poor, but the requirements of the stretched film on the equipment are more special. However, the stretched film also has its own advantages, that is, the viscosity of the stretched film is relatively stable, not controlled by time, but also affected by temperature. If the required viscosity is not suitable, it can be adjusted by adjusting the amount of viscous LLDPE.
The above describes two important properties that need to be understood in the production of stretch film. The content is for your reference only! If you want to know more about stretch film, you can pay attention to the world packing stretch film manufacturer website, we will update it regularly, if you want to consult the wholesale price of stretch film, please call us!
Shenzhen World Packing Industrial Ltd
Stretch Film & Packing Tape Specialist , Top China manufacturer
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