If the looks of the parts are important, you need to keep injection pressure
applied until the PVC is cool enough to eject from the mold. Otherwise you'll
get sink marks from it contracting.
From: Leonardo Marsaglia <[email protected]>
To: Enhanced Machine Controller (EMC) <[email protected]>
Sent: Sunday, February 12, 2017 2:10 PM
Subject: Re: [Emc-users] OT: Need some guidance on high temp/pressure water
circuit
2017-02-09 4:34 GMT-03:00 Roland Jollivet <[email protected]>:
> Probably more OT, but is this a very special mould? Or process?
>
> I've seen many plastic moulds running, and I think the general principle
> is; while there is hot and cold water available, once running, only the
> chillers are required. There is a net heat being generated from the hot
> plastic, so only cooling needs to take place.
> Also, the moulds are generally heated with electric cartridge heaters.
>
> If 280°C water was generally required for PVC, then you'd have no
> difficulty sourcing components.
>
Hello Roland.
My idea is to have small series of parts, but anyway I need to inject them
because is the cheapest way.
The problem is, I intend to make the mold to locking with mechanical
clamping, and also I intend to inject the PVC in about 4 minutes or so just
to avoid using a big hydraulic pump (The mass of the PVC to be injected is
about 4 kg). Since I don't have to make large series I can afford that
waste of time. But if I want to make the pump and injection system simpler
I need to mantain the mold heated to give the PVC time to fill it.
Thats why I came with this approach, wich I'm now only evaluating.
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