molding plastic injection high quality

Introduction to Injection Molding
Injection molding is one of the most significant processes in the industry. It allows for the production of complex structures with good precision and reproducibility. Its application extends to microelectronics, biomedical, automotive, and aerospace amongst others. The desirable property of materials like metals and plastics is how they form. When cooled they keep the new structures into which they have formed. Injection molding is also applied to thermoset materials. These are materials that do not melt upon heating. Instead, they go from viscous liquid to a solid-state through the process of crosslinking. Materials such as metals, rubbers, plastics, and glass can be injection molded. It allows for large scale production of products in repeated cycles.


The Injection Molding Machine
Injection molding machines are the injection and clamping sections. The injection section comprises a screw, barrel, valves, and control units. The clamping section comprises the sprue, runner, gates, and the mold and cooling unit. The material mixes and melts in the injection section. This melt is then compressed and cooled in the clamping section. The process can be fully automated, semi-automated, or manual. The fully automated system would include temperature controllers, automated ejectors, and metering. The manual processes may need the opening of the mold by hand. The ejection of the cooled product may also be by hand in the manual types.
The injection molding machine performs the role of melting, injecting, and holding. The main component of doing most of the work is the screw. In injection molding, the screw is a reciprocating screw. It moves forward and backward at specific points during the cycle. It applies sheer through torque as it rotates. The screw is in a barrel and the plastic pellets to form the new products feed into the barrel from the hopper. The barrel heats with electric heaters. These are along its length and this heat gets to the pellets and the screw. The product forms within the mold cavity attached to the nozzle of the barrel via a sprue. The sprue feeds the runner, this then feeds the molten material into the mold cavity through the gate.

Process Overview
Injection molding is a cyclic process. This means the process will occur as a sequence of events repeated in the same manner. A cycle begins with the mold closed. The material in pellet form goes into the hopper. The screw rotates and moves backwards. The pellets melted and the melt pushed forward along the barrel into the melt chamber.

The melting of the pellets is as a result of the heated walls of the barrel. The heat from friction between the rotating screw and the barrel also contributes. This continues until the screw reaches the limit switch. The limit switch indicates that the required shot size is in the melt chamber. The shot size refers to the amount of molten material required to fill the mold cavities in one cycle. This includes allowances for shrinkage, runner, and retained amount in the chamber. The melt chamber refers to the space between the screw end and the nozzle. The nozzle feeds the melt into the runners and molds.

Why Choose Bergek
professional custom CNC Machining Parts Manufacturer in China

* Guangdong Aluminum Application Precision Technology Co, Ltd was established in 2012 and has over 10 years experience of in researching. developing and manufacturing CNC Machining Parts
* We have the recognition of famous brand customers all over the world
* Our company has more than 200 professional employees and over 10000 sqm modern factory area
* Our products own many patents and quality system certifications ISO 9001
* Our products own many patents and quality system certifications ISO 9001 is over 250,000 tons, exported to over 120 countries.