Production Processes of PP Color Film

Production Processes of PP Color Film​

PP color film is widely used, but how is it made? Let’s look at its main production processes in simple words. These steps are easy to understand and show how raw plastic turns into colorful film.​

First, there is the raw material preparation step. The main material is polypropylene (PP) resin, which comes in small pellets. Workers mix these PP pellets with colorants—powders or liquids that give the film its bright colors, like red, blue, or yellow. Sometimes, they also add small amounts of other materials to make the film more flexible or durable. All these ingredients are mixed well in a special machine to form a uniform mixture.​

Next is the extrusion process, which is a key step. The mixed material is sent into an extruder—a machine with a heated tube. Inside the tube, the material melts into a hot, thick liquid because of the high temperature. Then, the machine pushes this melted PP through a narrow slot called a “die.” The die shapes the liquid into a thin, flat sheet. As soon as the sheet comes out of the die, it is cooled down quickly with cold air or water. This cooling makes the sheet harden into a basic PP film with color.​

After extrusion, some PP color films go through stretching. This step makes the film stronger and thinner. The basic film is pulled gently in one or two directions (lengthwise, widthwise, or both) by special rollers. Stretching aligns the plastic molecules, which improves the film’s strength—so it’s less likely to tear. Not all PP color films need this step, though; thicker films for simple packaging may skip it.​

The last main step is finishing and cutting. The finished film is rolled up into large rolls for easy handling. Then, workers use cutting machines to trim the rolls into smaller sizes—like the small rolls you might buy for wrapping gifts or decorating. Sometimes, they also add a thin adhesive layer to one side of the film, so it can stick easily to other things. Finally, the small rolls are checked for quality to make sure there are no holes or color spots, and then they are ready to be sold.​

These processes work together to make PP color film. Each step is important to ensure the film is colorful, strong, and useful for our daily needs.