Q stands for volumetric flow rate - for example, CC/sec or cu. in /sec. The molding machine settings determine the flow rate, but may be restricted by the sprue, runners and mold cavity. Shot size is the volume of everything being molded in that shot, including sprues/runners and cavity. Some molding machines can control shot size - a metered shot.
Thank you for watching! Please let us know what questions you have, and what you’d like to see next.
Thank you. I always like your educational videos 😊
How does one calculate the Renolds number
Would like to see more data on mold fill. Mainly laminar v turbulent flow.
Injection molding is almost always laminar flow. The viscosity of molten plastics is super high, and prevents turbulent flow.
Does Q Stand for shot volume flow rate which includes Part and runner sprue or just part volume rate? Video says shot size/fill time.
Q stands for volumetric flow rate - for example, CC/sec or cu. in /sec. The molding machine settings determine the flow rate, but may be restricted by the sprue, runners and mold cavity. Shot size is the volume of everything being molded in that shot, including sprues/runners and cavity. Some molding machines can control shot size - a metered shot.