Runner in Injection Moulding

Runner in Injection Moulding

“Runner” is a term used in injection molding that refers to the system of parts that are physically heated such that they can be more effectively used to transfer molten plastic from a machine’s nozzle into the various mold tool cavities that combine to form the shell of your part.

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Runner in injection moulding

“Runner” is a term used in injection molding that refers to the system of parts that are physically heated such that they can be more effectively used to transfer molten plastic from a machine’s nozzle into the various mold tool cavities that combine to form the shell of your part. Sometimes they are called “hot sprues.” You can contrast the term “hot runner” with its opposite, and the historically more common “cold runner.” Cold runners are simply an unheated, physical channel that is used to direct molten plastic into a mold tool cavity after it leaves the nozzle. The primary difference is that hot runners are heated while cold runners are not.

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Insert Molding is a highly efficient process by which metalstampings, bushings, electromechanical parts, filtration materials, and other discrete parts are combined into a single componets through the injection of thermoplastic around the carefully placed parts (Inserts)

Insert Molding steps:

1. The mold is loaded with inserts. Inserts may be loaded robotically or manually.

2. Molten plastic is injected into the mold.

3. Upon cooling, the mold opens and the components are removed. 

4. Components are separated from the sprues and inspected.

5. Post-molding assembly can include a variety of secondary operations, such as:

Die cutting of stampings into discrete circuits

Bonding

Microsoldering

Circuit testing

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