Injection Molding Home // Injection Molding: Mold Design Sprue and Sprue Puller Design 

Injection Molding Home // Injection Molding: Mold Design Sprue and Sprue Puller Design 

Injection Molding The GLS™ Injection Molding Guide provides in-depth information on part design, mold design and processing for styrenic block copolymer (SBC) thermoplastic elastomers (TPEs). Sprue and Sprue Puller Design

Injection Molding The GLS™ Injection Molding Guide provides in-depth information on part design, mold design and processing for styrenic block copolymer (SBC) thermoplastic elastomers (TPEs). Sprue and Sprue Puller Design

After the gate freezes, any additional material volume or pressure will only pack the sprue and runner system, which can cause difficulties with sprue removal during part ejection. It should be noted that the gate size/location, runner dimensions and other aspects of the mold design may also affect the properties of a part. Due to their higher modulus, hard formulations require less aggressive sprue-pullers.

After the gate freezes, any additional material volume or pressure will only pack the sprue and runner system, which can cause difficulties with sprue removal during part ejection. It should be noted that the gate size/location, runner dimensions and other aspects of the mold design may also affect the properties of a part. Due to their higher modulus, hard formulations require less aggressive sprue-pullers.

Injection Molding Home // Injection Molding: Part Design The shear thinning behavior of SBCs should be considered when designing injection molds and also when setting mold conditions during processing.

Injection Molding Home // Injection Molding: Part Design The shear thinning behavior of SBCs should be considered when designing injection molds and also when setting mold conditions during processing.

Injection Molding Equipment  Screw Design  Sprues and Runners 

In the case of softer GLS materials, it may be necessary to use a more aggressive sprue puller such as a pine tree design (Figure 10). If the product design requires a sprue gate, a hot sprue is preferred over cold because it reduces scrap, decreases cycle time, and allows for easier processing. If the product design requires a sprue gate, a hot sprue is preferred over cold because it reduces scrap, decreases cycle time, and allows for easier processing.