PP injection molded air duct is a duct system used for ventilation, exhaust and air transmission, usually made of polypropylene (PP) plastic. 

The following is the typical production process of PP injection molded air duct

Raw material preparation:

• Purchase polypropylene resin pellets suitable for injection molding.

• Perform preliminary treatments on the resin, such as drying, to ensure proper humidity and temperature.

Injection mold manufacturing:

• Make injection molds for air ducts and design the molds according to the required size and shape of the air ducts.

Precast pipe production:

• Prefabricated polypropylene pipes, usually of round or square cross-section, are used for injection molding.

Processing preparation:

• Prepare the injection molding machine, making sure it is set up correctly, including temperature, pressure and time parameters.

Injection molding process:

• Heat the polypropylene resin to the appropriate temperature.

• Inject the heated resin into the injection mold.

• High pressure is applied, causing the resin to fill the cavities in the mold.

• Wait for the resin to cool and solidify.

• Open the mold and take out the injection molded air duct.

Post-processing:

• Trim off any possible flash or uneven parts of the injection molding.

• Further processing such as cutting, drilling, etc.

Testing and Quality Control:

• Conduct quality inspections to ensure that the size and shape of ducts meet specifications.

• Check the pipe walls for uniformity and flatness.

• Test the pressure resistance and tightness of the pipeline.

Packaging and shipping:

• Pack the qualified PP injection molded air ducts and prepare them for shipment to customers.

• The above is the general PP injection molded air duct production process. The specific production process and process may vary depending on the manufacturer and product specifications. Throughout the production process, quality control and product testing are crucial to ensure that the air ducts produced meet safety standards and customer needs.

The difference between PP injection molded air duct and PP processed air duct

PP injection molded air ducts and PP processed air ducts are both duct systems used for ventilation, exhaust and air transmission. The main difference between them lies in their manufacturing methods and some performance characteristics.

The main differences between PP injection molded air duct and PP processed air duct:

Manufacturing method:

• PP injection molded air duct: PP injection molded air duct is manufactured by injection molding. The polypropylene resin particles are heated and melted, and then injected into the injection mold. The resin is filled into the cavity of the mold through high pressure, and finally the air duct is formed.

• PP processed air duct: PP processed air duct is usually manufactured by cutting, welding, hot melting or other processing methods of prefabricated PP pipes.

Shape and size:

• PP injection molded air duct: The shape and size of injection molded air ducts are usually limited by the injection mold, so air ducts of various shapes and sizes can be produced.

• PP processed air duct: The shape and size of the processed air duct can be customized according to needs, which is more flexible and can adapt to various special applications and requirements.

Production costs:

• PP injection molded air duct usually requires the manufacture of injection molds, which may result in higher initial costs, but can be more economical in mass production. Automated production processes reduce the investment in human resources.

• The main cost input for PP processing air duct is labor cost, and all production processes require the investment of human resources.

Production efficiency difference:

• PP injection molded air duct is usually suitable for large-scale automated mechanical continuous production and can achieve high production efficiency.

• PP processed air duct is suitable for small-scale production or situations where specific sizes are required. Usually air ducts exceeding a certain size can only be made through processing. Human productivity is low and is limited by working hours and work locations.

Quality consistency:

• PP injection molded air ducts generally have higher quality consistency, and the air ducts have higher sealing and pressure resistance because they are produced through the same mold and process.

• The quality consistency of PP processed air ducts may be affected by process technology and operating skills, and there are large tolerances in production.

In short, choosing PP injection molded air duct or PP processed air duct depends on specific needs. Injection molded duct is suitable for large-scale production and situations where consistency is required, while machined duct is more suitable for small-scale production and situations where flexibility and customization are required.