Plastic Injection Flow Rate
Compute the injection flow rate by dividing the injected volume by the fill time, in cm³/s. It is the speed at which the molten plastic enters the mold — a parameter that controls the shear rate, molecular orientation, surface finish and defects such as jetting or flow marks. High flow fills fast but may degrade; low flow may solidify before filling. Enter the injected volume and the fill time.
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Vazão de injeção de plástico
A vazão de injeção — volume injetado dividido pelo tempo de preenchimento — é a velocidade com que o plástico fundido invade o molde, e seu ajuste é decisivo para a qualidade. Vazão alta preenche rápido (bom para peças grandes ou de parede fina, antes que o material congele), mas eleva a taxa de cisalhamento e pode degradar o polímero, gerar jato livre (jetting — um filete de plástico que se enovela no fundo da cavidade) ou queimar o ar preso (efeito diesel). Vazão baixa dá acabamento suave, mas arrisca o material solidificar antes de preencher (peça incompleta, com 'short shot') e deixa marcas de fluxo e linhas de solda fracas. As injetoras modernas usam perfis de velocidade — rápido no enchimento principal, lento ao passar pelo gate e ao final — para equilibrar tudo isso. A vazão também governa a orientação molecular, que afeta empenamento e resistência. Informe o volume injetado e o tempo de preenchimento.
Related Tools
Mold Cavity Pressure
Estimate the pressure that actually reaches the mold cavity by multiplying the injection pressure (at the screw tip) by the pressure transmission factor, which accounts for pressure losses along the runners, nozzle and gates to the cavity. Typically only 40–60% of the machine pressure reaches the part. It is the cavity pressure that defines the clamping force and fill quality. Enter the injection pressure and the transmission factor.
Shear Rate (Injection)
Compute the shear rate of the molten plastic in a rectangular channel, γ = 6Q/(W·H²), from the flow rate (Q), the channel width (W) and height (H). It is a critical parameter of polymer processing: thermoplastic viscosity drops with shear rate (pseudoplastic behavior), and excessive rates degrade the material. It guides the design of runners and gates. Enter the flow rate, the width and the height of the channel.
Mold Cavity Count
Compute the maximum number of mold cavities the machine can fill per cycle by dividing the machine's injection capacity by each part's mass (rounding down). More cavities increase productivity but require a larger machine and a more expensive, complex mold. It is a key calculation in production planning and mold selection. Enter the machine injection capacity and each part's mass.
The results provided by this tool are for general informational and educational purposes only and do not constitute professional, financial, medical, legal, tax or accounting advice. Always confirm important decisions with a qualified professional and official sources.