Points on those deep ribs, so as to avoid ejector marks caused by excessive The ejector pins need to be designed on the ribs.ДЇor products with deep ribs, it is necessary to put the stress Is more difficult to eject the product, need to be ejected with higher force. For example, the areas with deep ribs, that is, the areas where it The design shouldД®nsure that the properly sized ejector pin is uniformly stressed when the product The type, arrangement, size, location and number ofД®jectors all have a lot to do with the occurrence of ejector marks. The internal stress around the gate is the highest, so the gate should be located where it is easy to fill the cavity and as far away as possible from the ejector, while resin filling should be as uniform as possible to ensure uniform stress distribution.Дў). When ejector marks occur on the product, the sizes of the sprue and the runner can be appropriately increased to alleviate the overshooting of the injection pressure and other parameters caused by filling difficulty (note: the sizes of the sprue and the runner can only be changed and increased when the injection parameters are too high, or other severe issues may occur design vents at the runner end). In order to save raw materials and facilitate subsequent mold changes, the sizes of the nozzle and runner are usually not too large when they are first designed. In the cavity, the thickness must be no less than 2.8mm.ДЎ). Speaking, for some complex-structured products, i.e., products with more ribs Of a simple-structured product needs to be no less than 2.5mm. Is dependent on the raw material and product structure. Whether the product wall thickness is appropriately designed Causes of ejector pin marks and solutions Machine tonnage and setting of clamping force. Inappropriate clamping force parameters: selection of Inappropriate ejection parameters: the influence ofД¦).

Inappropriate material temperature parameters: the temperatureДҐ). Temperature settings of the mold core and the mold cavity, and the correspondingД¬ooling channel selection for the product.Д¤).

Inappropriate mold temperature parameters: the different Switching position, and level of backpressure.ДЈ). Holding pressure and holding pressure speed, selection of holding pressure Inappropriate holding pressure parameters: control of

Injection pressure and injection speed, as well as the selection of injectionДў). Inappropriate injection parameters: control of Inappropriate mold venting system design: when the productДЎ). Product is not evenly cooled in the cavity.ДҐ). Inappropriate mold cooling channel design: the Inappropriate ejector mechanism design: the ejector type, size, locationДЄnd quantity all influence the occurrence of ejector marks, such as ribs,Д¤). The internal stress around the gate is the highest, making theДЈ). If the gate is too small, too much flow resistance and orientation stress Inappropriate gate design: the type, location, size, and number of the Of the plastic, and affects the adjustment of the molding parameters.Дў). Narrow, the main runner is too long, or the runner is designed with sharp turns.ДЄll these factors will increase the flow resistance, greatly limits the filling Inappropriate gating system design: the runner is too On the contrary, the excessively thin wall will make it difficult to fill the cavity, and accordingly require the increase of various molding parameters, thus making it easy to generate ejector pin marks.ДЎ). Increasing the thickness of a product is able to not only improve the filling performance of the resin, but also reduce the orientation stress as well as product deformation. The thickness of a product is an important factor to consider during structural design. Ejector pin marks usually refer to the glossy or white imprints on the surface of a injection molded product, as well as the different levels of glossiness вЂ“ dark or shadow, without convex or concave вЂ“ visible directly opposite to the ejector pin location.