Injection Molding
WHAT IS INJECTION MOLDING ?
Injection Molding is a manufacturing process of forming the molded parts into a mold by melting plastic pellet with heat on the mold and then cooling and solidifying and injection the parts. This process allows for plastic, rubber parts to be injection in low volume and large-scale production.
How Does Injection Molding Work?
1. Mold Closing
2. Injection
3. Pressure Holding
4. Cooling
5. Mold Opening
6. Take out the parts
To get high quality and accurate injection molding parts, injection molding parameters like barrel temperature, injection speed, mold temperature, molding pressure, etc have to take into great consideration.
To learn more about our injection molding service, contact us now.
Temperature Control
The temperature to be controlled in the injection molding process includes barrel temperature, nozzle temperature and mold temperature.
1
Barrel Temperature
The barrel temperature and nozzle temperature mainly determine the plasticization and flow of plastic, while the mold temperature determines the flow and cooling of plastic.
Each kind of plastic has different flow temperature. For the same plastic, due to different brands and models, the flow temperature and decomposition temperature are also different. Therefore, during injection molding, pay attention to different materials and set appropriate temperature according to material parameters is one of the critical factors to get good quality parts.
2
Nozzle Temperature
The nozzle temperature is usually slightly lower than the maximum temperature of the barrel to prevent the possible salivation of molten material in the straight through nozzle. The nozzle temperature should not be too low, otherwise it will cause early solidification of molten material and block the nozzle, thus affecting the product quality.
3
Mold Temperature
Mold temperature has a great influence on the internal property performance and appearance quality of products. The mold temperature setting depends on the crystallinity of the plastic, the size and structure of the product, performance requirements, and other process conditions, such as melt temperature, injection speed and injection pressure, injection cycle, etc.
Pressure Control
The injection molding process includes injection pressure and plasticizing pressure,
which directly affects the plasticization of plastics and the quality of products.
1
Plasticizing Pressure
Back pressure-when the screw injection machine is used, the pressure on the molten material at the top of the screw when the screw rotates and retreats is called plasticizing pressure, also known as back pressure. This pressure can be adjusted by the overflow valve in the hydraulic system.
2
Injection Pressure
In the current production, the injection pressure of almost all injection machines is based on the top of the plunger or screw to the plastic.
The applied pressure (converted from oil circuit pressure) shall prevail. The role of injection pressure in injection molding is to overcome the flow resistance of plastic from the barrel to the cavity, give the melt filling rate and compact the melt.
Injection Molding Cycle
The molding cycle directly affects labor productivity and equipment utilization. Therefore, in the production process, the relevant time in the forming cycle should be shortened as far as possible on the premise of ensuring the quality. In the whole molding cycle, injection time and cooling time are the most important, which have a decisive impact on the quality of products.
Our Injection Molding Capability
· More than 150 types and grates of pastics and rubber are available.
· 26 injection moding machines from 80T to 850T to meet parts of different shape at different sizes.
· Fexible quantity can be 1000 to 2000,000+ pieces.
· Dust-free Injection Moding Workshop Section
· Overmod and Insert Mold
· Reated components outsourcing and assembly
· Automatic Injection Moding with machine hand
· Quaity Control System
Pressure Control
We will do a series of quality control from the material storage to production to the finished products.
We will do the first inspection of the initial few molding parts and routing inspection during production and final check for finished parts. Related documents and recorded will be kept and the same molding parameter and mold temperature will be controlled for different batches to ensure the parts quality is consistent.
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