Plastic machinery comes in various types, and it is commonly categorized based on the processing technology into three main groups: extruders, injection molding machines, and blow molding machines. Each of these machines plays a crucial role in the plastics industry, enabling the production of a wide range of products.
Extruders
An extruder works by pushing molten plastic through a die with a specific shape, using a rotating screw inside a heated barrel. Once extruded, the material is cooled and cut into desired lengths. This machine is ideal for continuous production of items like pipes, rods, and profiles. It can also be used for plastic modification and granulation.
The basic principle of an extruder is straightforward: a screw rotates within the barrel, pushing the plastic forward. The screw acts as a helical channel that increases pressure to overcome resistance. There are three main types of resistance involved: friction between solid particles and the barrel wall, internal friction between the material before the screw starts rotating, and the resistance from the molten plastic as it moves forward.
Extruders are typically divided into two categories: single-screw and twin-screw. Single-screw extruders are simpler and more common, while twin-screw extruders offer better mixing and are often used for complex materials or high-performance applications.
Injection Molding Machines
Injection molding machines inject molten plastic into a mold, where it cools and solidifies into the desired shape. These machines are widely used across industries due to their versatility and efficiency. They are particularly suitable for producing large volumes of identical parts with high precision.
These machines can be used directly for molding or as part of the injection-blowing process. Modern injection molding machines come equipped with advanced control systems that enhance performance and safety. Key features include:
- Advanced computer control from reputable manufacturers;
- Self-diagnosis for fault detection;
- Direct input of parameters such as pressure, speed, time, stroke, and temperature;
- Color LCD display for easy monitoring;
- Centralized lubrication system;
- Energy-saving oil circuit with pressure coupling;
- 24V DC oil valve coil that is durable and long-lasting;
- Mold cooling water regulation device;
- MCB electric heating control for safety;
- Large-screen interface with user-friendly design;
- High-precision electronic ruler with ±0.1mm accuracy;
- Pressure and oil quantity feedback for improved reproducibility;
- Triple safety system (mechanical, electrical, hydraulic) for operator protection;
- High-performance position sensors for better control;
- Closed-loop control for ultra-precise molding.
Plastic machinery, sometimes referred to as plastic equipment, is essential in transforming raw plastics into finished products. In the industry, the terms "plastics" and "plastic" are often used interchangeably. Historically, factories were called "plastic factories," but in regions like Hong Kong and Taiwan, they were known as "plastic companies." Today, many Chinese enterprises use the term "Plastics Co., Ltd." to align with international business standards and improve communication with foreign partners.
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