Plastic devices and products have long become ordinary in our life. Almost everything that surrounds us at home is made of plastic, at work, on vacation. Toothbrushes and children’s toys, dietary panels of cars and oilcloths on kitchen tables, household appliances and disposable dishes – everything is made of plastic. Today, plastic, due to its functionality, high quality, strength and cheapness, is considered as an equivalent alternative to glass, metal and wood.
Before the production of plastic products is the stage: the manufacture of press forms for casting plastic. Pressforms – special devices in which polymer granules fall asleep. In the press forms, this raw materials are melted and exposed to high pressure. As a result, the right plastic product appears.
Let’s look at what kind of press-forms are and are there any differences between them.
By design, all press -forms are divided into two main types – direct and casting pressing. Using the first type of devices, the product is made as follows: the polymer powder is supplied to the matrix of the desired shape, is heated in it to a certain temperature, and then, under the influence of pressure from the plastic material, the finished product is formed. True, in this technology, in addition to advantages, there are significant disadvantages.
Yes, these molds are very easy to create and operate. But with their help it is impossible to make complex details in large numbers. So for casting plastic elements of a complex configuration and on a large scale, the direct pressing method is not suitable.
The second type is based on casting pressing. The design of the press forms for plastics this species is not as simple as the previous. In them, the matrix plate with cavities is located separately from the loading capacity. So for the supply of production raw materials to the matrix, a system of special channels is used – gigs.
Thanks to this design, the press form becomes multifunctional. With its help, you can create a wide range of various plastic products, and on a fairly large scale.
But the press form data also has its shortcomings. The most important is the structural complexity of the device. Also, products manufactured using such press forms are very limited in maximum sizes. And the last, but important, drawback is frequent breakdowns of this equipment.
This article made it possible to describe in detail the two main types of press forms for the formation of plastic products. Each of them has its own advantages and disadvantages. However, for large -scale production of complex elements, cast pressing devices are suitable, and for small production – direct.