Multi Cavity Hot Runner System

You want a Multi-Cavity Hot Runner System list. Fine. Industrial plastic engineering… finally something that isn’t “make logo bigger.” Respect.Let’s break it cleanly so you can actually use it in design, sales, or manufacturing.

? Multi-Cavity Hot Runner System – Types ListA multi-cavity hot runner system distributes molten plastic from one injection point to multiple cavities using a heated manifold and nozzles. (Wikipedia)
In high-volume molds, this can go from 2 cavities to 128+ cavities if you’re feeling ambitious (or slightly reckless). (Wikipedia)

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1. Based on Gate Type• Open Gate (Hot Tip)

• Continuous flow (no shut-off)
• Simple and low cost
• Leaves small gate mark
• Used in caps, containers, basic parts

? Cheap, fast, slightly messy finish• Valve Gate System

• Pin-controlled opening/closing
• Hydraulic / Pneumatic / Servo driven (hrsflow.com)
• No gate marks, high precision

? Premium choice for automotive, medical, packaging

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2. Based on Manifold Design• Naturally Balanced System

• Equal flow path length to each cavity
• Ensures uniform filling

? Preferred for identical multi-cavity parts• Artificially Balanced System

• Unequal runner lengths but flow is adjusted
• Used where geometry forces uneven layout

? Engineers fixing design mistakes creatively

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3. Based on Heating Method• Externally Heated Hot Runner

• Heaters outside manifold
• Easy maintenance
• Slight heat loss

• Internally Heated Hot Runner

• Heaters inside flow channels
• Better temperature uniformity

? More efficient but more complex• Insulated Runner System

• Uses plastic melt insulation instead of heaters (Wikipedia)
• Low cost but less precise

? Old-school approach still hanging on

4. Based on Nozzle Type• Free Flow Nozzle

• Direct melt flow
• Simple, less control

• Torpedo Nozzle

• Guided flow via internal tip
• Better distribution

• Precision shut-off control
• Best surface finish

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5. Based on Cavity Arrangement• Symmetrical Multi-Cavity (Balanced Layout)

• Valve Gate Nozzle

• Equal cavity spacing
• Ideal for mass production

• Family Mold (Multi-Part Cavities)

• Different parts in one mold
• Same material, different shapes (Wikipedia)

? Efficient but tricky balancing• High-Cavitation Systems

• 16, 32, 64, 128 cavities
• Used in:
  • Bottle caps
  • PET preforms
  • Medical disposables

? Where machines basically print money

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6. Based on Flow Control System• Sequential Valve Gate System

• Cavities filled in sequence
• Reduces weld lines

• Simultaneous Filling System

• All cavities fill together
• Faster cycle

• Dynamic Flow Control (Advanced)

• Real-time pressure balancing per cavity (plasticportal.eu)

? Fancy, expensive, extremely effective

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7. Based on System Configuration• Hot Sprue System (Single to Multi)

• Basic system, limited scalability

• Full Hot Runner System

• Manifold + multiple nozzles
• True multi-cavity production

• Hybrid System (Hot + Cold Runner)

• Mix of both systems
• Cost optimization

? Half premium, half compromise

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⚙️ Core Components (Quick Reference)Every multi-cavity hot runner system includes:

• Manifold – distributes molten plastic
• Nozzles – inject into cavities
• Heaters – maintain melt temperature
• Thermocouples – monitor heat
• Temperature Controller – controls zones
• Gate Mechanism – open or valve system

(plasticmoldfactory.com)

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? Practical Insight (Because theory is cute but production is brutal)

• Use Valve Gate + Balanced Manifold → for high-end products
• Use Open Gate + Standard Manifold → for low-cost mass items
• Use Sequential Valve Gate → for large or cosmetic parts
• Use High Cavitation System → when volume justifies tooling cost