BACK PRESSURE | Technical Tuesdays | HYMID
Ғылым және технология
Welcome back to another episode of Technical Tuesdays. This is the series where we explore how the different parameters within injection moulding can affect the final part or product.
In this episode, we explore the role that Back Pressure plays in the injection moulding process and the vital parameters it helps to control.
Hymid is an Injection Moulder based in the South West of England, UK. They specialise in small to medium-volume projects that utilise technical moulding methods, such as Two-Shot moulding ( • HYMID Video: What is 2... ).
Hymid has extensive design capabilities and can ensure that not only is your product optimised for injection moulding, but that it will be best received by your target market.
All tool designs and builds are supervised by Hymid and come with a full UK guarantee, ensuring that you can get the most from your investment. If you have a project or need advice regarding injection moulding, visit our website and get in touch: hymid.co.uk/.
Music Rights:
Calm Emotional No Copyright Aesthetic Guitar House Background Music for Vlog - "Sad Sky" by INOSSI "Emotional house track with guitar and vocal arrangements." - @INOSSI
Chill Fresh No Copyright Free Instrumental Background Vlog Music for Video | "Daylight" by Spiring "Daylight is a summer tropical house track. Hope that it can show you the joy of life!" - @Spiring
Пікірлер: 11
I've been molding for 25 years. As far as I know adding backpressure increased the shot density therefor increasing the part weight. Or maybe i've been doing it wrong all along.
@svci96
9 ай бұрын
As you are 25 years experienced, I want to speak with you sir
GREAT WORK KEEP GOING
@hymid
Жыл бұрын
Thanks! We certainly will!
Back pressure is the amount of pressure the plastic has to exert on the screw to force it backwards, hence the name: back pressure. Increasing back pressure increases the density (the weight) of the shot (molten plastic) at the front of the screw.
thnx for video BUT i would ask about raising the back pressure u told us in the video that raising it make the part weight less while the density getting higher how is that possible i think both should getting higher Thnx
@xMrGrimshawx
Жыл бұрын
Increasing back pressure does increase part weight. I have not been in their facility to see what exactly is going on with the part weight in their particular scenario. I could speculate the back pressure is causing the plastic pressure to exceed the nozzle contact force and drooling between shots. Perhaps the hold time is shorter than needed to completely seal the gate leading to inconsistent part weight, the process could be running pressure limited causing weight inconsistencies with viscosity changes. If it's a hot runner mold the hot tip could have an internal leak. It's a guessing game without thoroughly investigating a root cause.
hope that you make new video about maintenance molding machine
@hymid
10 ай бұрын
We have a number of projects that we’re working on! Stay tuned!
Hi
@hymid
Жыл бұрын
Hi!