What are these circle marks on injection molded plastics?
I see these circle marks on many injection molded plastics (red arrows pointed). What causes them in the manufacturing process? Thanks!
* In addition, anyone knows the function of a cold slug in injection molding process?
- TechnobuffLv 73 年前最愛解答
No, they are not gates, they are from pins that extend and eject the moulded part from the mould when it opens. That's why they are round and flat. The sheer number on that moulding indicates it is hard to release.
A cold well is a cavity into which the first injected plastic (it has cooled out at the injection nozzle between shots) can be held back, allowing properly heated plastic to enter the mould. Temperatures are important.
- PhilomelLv 73 年前
These are called gates where the molten plastic was forced into the mold.
- 匿名3 年前
I think that is the point where the melted plastic was injected into he mold. After the plastic cools they have a process which removes the post of plastic which is attached to the piece where the marks are. As for the cold slug, I have no idea.
- DeMoNsLaYeR575Lv 73 年前
those are the sites where the plastic is injected into the mold.