23/08/2023
The production of containers is carried out by various methods, the most common are molding and casting.
Molding allows you to produce plastic packaging with thin walls. With this technology, individual parts of the product are stretched unevenly, a lot of waste is generated, but they can be launched into a new cycle. After manufacturing, containers need additional processing: pruning, gluing, so this method is usually used to create products that are simple in configuration. The advantages of the method are high productivity, the possibility of processing printed materials, as well as multilayer, foamed ones.
There are two types of molding: vacuum and pneumatic.
Vacuum occurs by applying a sheet blank to the matrix, heating, removing air between the matrix and the workpiece. With gradual cooling of the plastic, it presses more tightly against the matrix, acquiring the desired shape. It is possible to use a punch. Sometimes the heated sheet is pre-stretched by a pusher or compressed air (when forming on a punch).
Pneumoforming is the manufacture of a product using compressed air. The plastic billet is preheated to a plastic state. This method is suitable for creating large products, objects made of thick-walled materials.
Injection molding is the pouring of a plastic mass melted to a fluid state into a detachable mold and hardening it under pressure. Polymers in the form of granulate are used for casting, providing uniform melting, high quality of finished products. This technology allows you to work with different types of plastic and create complex shapes, but its performance is lower due to a longer cycle.
