What Is The Mold Mainstream

Definition and locationThe mold main way is also called the main runner or sprue,Refers to the flow channel from the part of the extruder nozzle in contact with the main mold flow channel bushing to the diverter channel, which is the first part of the molten plastic after entering the mold.Shape and sizeThe main channel is usually designed in a conical shape, with the small end toward the mold cavity and the large end connected to the nozzle of the injection molding machine. This conical design helps the plastic melt to smoothly transition from the injection molding machine nozzle to the inside of the mold, which can make the melt gradually change the flow rate and pressure during the flow process, avoid the adverse phenomena such as melt injection and turbulence, and ensure that the plastic melt can smoothly and evenly enter the subsequent shunt and cavity.Size specificationThe size of the main channel needs to be determined according to the specifications of the injection molding machine, the plastic material used and the size and shape of the plastic products to be produced. Generally speaking, the small end diameter of the main channel is usually between 3-8 mm, for example, for small plastic products (such as small bottle caps, small size plastic accessories, etc.), the small end diameter of the main channel may be 3-5 mm; For slightly larger plastic products, the small end diameter will be appropriately increased to 5-8 mm. The length of the main channel also has certain requirements, which should be shortened as far as possible under the premise of ensuring the smooth transition of the melt, so as to reduce the pressure loss and heat loss of the melt in the flow process, and the length is mostly in the range of tens of millimeters, and the common is 20-60 millimeters.