Usage: cling film is a commonly used packaging material for preserving food, with moderate oxygen and humidity permeability. It regulates the oxygen and moisture content around the preserved food, blocks dust in the air, and extends the shelf life of the food. PVC cling film has the characteristics of high and low temperature resistance, as well as high transparency, stretchability, and viscosity. It is easy to use and has a low product price. It is used in the packaging of fresh food and has become an integral part of people's daily lives.

Advantages of PVC material
PVC cling film has the characteristics of high and low temperature resistance, high transparency, strong stretchability, and moderate viscosity, which can effectively block oxygen and moisture and extend the shelf life of food.
Core production process
Extrusion molding: After mixing PVC resin powder with auxiliary materials, it is melted and plasticized through a twin-screw extruder to form a uniform melt.
Mold control: Precision mold controls film thickness (usually 0.01-0.03mm) and width (up to 2100mm).
Cooling and shaping: The three roll cooling device quickly cools the film to ensure dimensional stability.
2、 The entire process of the production line
raw material preparation
Mix PVC resin powder with auxiliary materials such as plasticizers and stabilizers to ensure material uniformity and stability.
Extrusion
Twin screw extruder: plasticizes PVC at high temperatures (160-180 ℃) to form a uniform melt.
Screen changer and metering pump: filter impurities and stabilize extrusion pressure.
cooling pitching
Three roll cooling device: The main roll and auxiliary roll work together to preliminarily cool the film.
Cooling rack: secondary cooling to ensure stable film size.
Cutting and winding
Automatic thickness measurement and cutting: Cut waste edges according to preset width and length.
Tension controlled winding: Constant tension winding ensures that the film roll is flat and easy to transport.
3、 Core equipment composition
Extrusion System
Twin screw extruder: high torque design, suitable for PVC high viscosity characteristics.
Mold: T-shaped mold head or hanger mold head, supporting wide width (1.2-2.1m) production.
Cooling and shaping
Three roll calender: chrome plated roller surface, temperature control accuracy ± 1 ℃.
Cooling roller set: Teflon coated anti stick to ensure rapid cooling.
Automated control
Microcomputer integrated control: remote monitoring of extrusion temperature, speed, tension and other parameters.
Automatic winding: equipped with EPC correction system to ensure neat winding