Processing methods for PPS : Injection, Extrusion, Molding, Spray molding

PPS material should be dried in a drying oven for 3-4 hours at 150°C before processing. PPS that has not been thoroughly dried will not affect the homogeneity of the part, but may cause trouble during processing. For example, moisture that collects on the filler of the mix can turn to vapor and make the nozzles of the injection molding machine run. Therefore, thorough drying of the PPS material before processing is essential.PPS materials can be processed using a variety of molding processes, including injection molding, extrusion, molding, and spray molding. These processing methods are described below:

Injection molding

Injection molding is one of the common processing methods for PPS materials. When injection molding, the following process parameters need to be noted:

1. Material brief temperature: 280-330 ℃ for pure PPS, reinforced grade PPS for 300-350 ℃.

2. Nozzle temperature: 305℃ for pure PPS, 330℃ for reinforced PPS.

3. Mold temperature: 120-180 ℃.

4. Injection pressure: 50-130MPA.

Extrusion molding

Extrusion molding is also one of the common processing methods of PPS materials. In the extrusion, need to pay attention to the following process parameters:

1. Temperature of feeding section: less than 200℃.

2. Material brief temperature: 300-340 ℃.

3. Temperature of connecting body: 320-340℃.

4. Temperature of mouth mold: 300-320℃.

Molding

Molding is suitable for large products, the use of two compression, first cooling, then hot pressing. The preheating temperature of hot pressing is about 15min at 360℃ for pure PPS, and about 20min at 380℃ for reinforced PPS; the molding pressure is 10-30Mpa, and it is cooled to 150℃ for demolding.

Spray molding

Spray molding is the use of spray gun PPS material sprayed onto the metal surface, and then after plasticizing, quenching treatment and get a coating of a processing method. When spraying, you need to pay attention to the following process parameters:

1. Using the suspension spraying method and suspension spraying and dry powder thermal spraying hybrid method.

2. PPS is sprayed onto the metal surface. 3.

3. Plasticizing and quenching are carried out to obtain the coating.

4. The coating treatment of PPS is performed at a temperature of 300°C or higher and held for 30 min.