Cast film equipment can be divided into the following categories according to different processes and uses:
Single-layer cast film equipment: used to produce single-layer cast film products, suitable for some simple packaging films and industrial films and other applications.
Multi-layer cast film equipment: used to produce multi-layer composite cast film products, suitable for some applications that require multiple characteristics, such as food packaging film, fresh-keeping film, etc.
Film coating equipment: used to coat one or more layers of film materials on the surface of the cast film to increase the characteristics of the film, usually used to produce functional films, such as optical films, antistatic films, etc.
Stretch film machine: used to produce stretch packaging film, this equipment usually has stretching and extensibility properties, so that the film can obtain better transparency and toughness.
Gas isolation film equipment: used to produce gas isolation films, this equipment adds special gas barrier materials in the casting process, so that the film has better gas isolation performance.
These different types of cast film equipment have their own characteristics and scope of application. It is very important to choose the appropriate equipment according to specific production needs and product requirements.
The working principle of cast film machine is as follows: Prepare raw materials: firstly, you need to prepare corresponding raw materials, such as plastic granules or granules, and put them into the hopper for the subsequent casting process. Melting and extrusion: After the raw materials are heated and melted, the molten plastic is extruded into a thin and wide film through an extruder. Die-casting and cooling: The extruded molten plastic film is pressed and cooled under the action of a die-casting roller or an embossing roller to form a flat film. Stretching and cooling: the film is stretched by rollers, and the stretching and cooling of the film can be realized by adjusting the speed difference of the rollers to make it reach the required thickness and width. Inspection and trimming: During the casting process, the film may have some defects, such as bubbles, breakage, etc., which need to be inspected and trimmed to ensure the quality of the film. Roll-up and collection: The above-treated films are automatically wound up on rolls, or collected after being cut and stacked. The above is the working principle of the general cast film machine, and the specific working steps and processes may vary according to different models and production requirements.
Post time: Oct-24-2023