精密注塑模具是指树脂材料射入金属模型后得到具有一定形状的制品的装置。事实上为了控制模具的温度，在模具上还有使冷媒通过的冷却孔，加热器等装置。已成为熔体的材料进入主流道，经分流道，浇口射入模腔内。经过冷却阶段后打开模具，成型机上的顶出装置会把顶出杆顶出，将制品推出。成形品成形品是由使熔融树脂流入的主流道，引导熔融树脂进入模腔的分流道及制品所构成的。我们通常将分流道的长度设计为相等的。回料的使用成形品中的主流道和分流道并不是产品，有时会被丢弃或粉碎后作为成型材料再度使用。我们将它称之为回料。回料一般不作为成型材料被单独使用，通常是与新料混配后使用。这是因为经过一次成型后，树脂的机械性能，流动性，颜色等各种特性都会发生变化。
Precision injection mold is a kind of device that resin material is injected into metal model to get products with certain shape. In fact, in order to control the temperature of the mold, there are cooling holes, heaters and other devices on the mold to make the refrigerant pass through. The material that has become melt enters the main flow channel, and the gate is injected into the mold cavity through the sub flow channel. After the cooling stage, open the mold, and the ejector on the molding machine will push out the ejector rod and push out the products. The forming product is composed of the main flow channel for the molten resin to flow into the mold cavity, the shunt channel for the molten resin to flow into the mold cavity and the products. We usually design the length of the runner to be equal. The use of recycling the main and branch channels in the products are not products, sometimes they will be discarded or crushed and reused as molding materials. We call it recycling. Generally, recycling is not used as molding materials alone, but is usually used after mixing with new materials. This is because after a molding, the mechanical properties, liquidity, color and other characteristics of the resin will change.