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Common types of injection molds
Feb 02,2024
According to product batch, structure and material characteristics, injection molds can be divided into various types：
1. By the number of cavities: single cavity vs multi-cavity
Single-cavity mold: one product is formed at a time, suitable for large and complex parts (such as car bumpers) or small batch production (annual output <100,000 pieces), the mold cost is low (about 50,000-200,000 yuan), but the production efficiency is low.
Multi-cavity mold: contains 2-128 of the same cavity, forming multiple products at once, suitable for small standard parts (such as bottle caps, connectors).For example, a 32-cavity bottle cap mold can produce 15,000 pieces per hour. Although the mold cost is high (200,000-500,000 yuan), the cost of a single piece is only 0.01 yuan.
2. According to the form of flow channel: cold flow channel vs hot flow channel
Cold runner mold: The runner is cooled and cured together with the product, and the material handle needs to be manually trimmed. It is suitable for small batch production (such as customized parts). The mold cost is low (saving 30%-50%) but the material waste rate is high (about 10%-20%).
Hot runner mold: The runner is heated to maintain a molten state, without material waste, and is suitable for mass production (annual output >1 million pieces).Although the mold cost increases by 50%-100%, it can reduce material loss by 30% and shorten the cycle by 15%, and the long-term price ratio is higher.
3. Special function mold: to cope with complex needs
Two-color mold: one-piece molding of two materials /colors (such as hard glue + soft glue toothbrush handle) is achieved by rotating or moving the cavity, eliminating the need for secondary assembly process.
Insert mold: The metal parts (such as nuts, electrodes) are pre-placed in the cavity. When injection molding, the plastic is combined with the metal, which is suitable for parts that require conductivity or high strength (such as automotive sensor housings).
Laminated mold: The design of the upper and lower cavities is superimposed, and the production capacity is doubled without increasing the size of the mold. It is commonly used in the production of thin-walled containers (such as yogurt cups).
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