Mold machines play a vital role in the manufacture of p […]
Mold machines play a vital role in the manufacture of plastic products, especially polyethylene. Polyethylene is the product used in many products including cans, bottles, labels, tapes, papers, etc. This product can be manufactured into shapes such as cans, bottles, boxes, etc., using this molding method. These moldings are usually produced in bulk by this machine.
DescriptionAn injection mold machine, also called an injection press, is a compact machine for producing plastic objects by the hot-water-injection molding technique. It includes two main components, a clamping unit and an injection unit. The two parts are usually fastened together with the help of a threaded fastener called a die head.
The first component of this machine is called the clamping head. This is usually called the parison assembly because it is used in the process of injection blow molding. This clamping head has a large opening and is shaped like a cup. It holds the mold cavity partially open for permitting vacuum embossing of the mold material. The vacuum embossing process gives a rough finish to the mold cavity.
The second component is the injection unit. This is shaped like a tall cylinder and is attached to the clamping head by a number of screws. It is placed over the material to be molded and acts as a source of vacuum energy to expand the mold cavity during the hot-water-injection process. The extrusion blow molding method is suitable for most plastics. It produces fine lines and textures.
The third and last component is the parison assembly. This is shaped like a tall cylinder with apertures at its ends. Thesepertures serve to mount the injector bars. The material is fed into the holes and the plastic melts when the injector bars reach the correct pressure. As soon as it cools, the cooled plastic drops down into the chamber and extrudes out through the bottom opening.
The thermoplastic injection molding is a very simple process that can be carried out easily with the help of machines like the extrusion blow molding machines or the thermoplastics injection molding systems. This method of forming products is now preferred over the manual methods because of its speed and accuracy. The thermoplastic injection molding machines are available in different sizes to meet the requirements of different industries. They are also developed to be flexible to suit varied manufacturing applications.
The hot runner molding process starts with the injection of a molten thermoplastic compound into the mold cavity. As the hot runner molding takes place, the material passes through the injection mold cavity at very high speed. This causes a build-up of pressure inside the mold cavity. The heated air and water droplets are then collected after the material passes through the cavity.
This material is then compressed by the high centrifugal forces generated during the compression phase. A special tooling system is used to increase the exposure of the hot resin to the mold at high temperatures. The heated resin droplets are collected at the bottom of the mold after the material reaches the intended mold cavity. This entire process generates a heat energy which hardens the polymer.