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  1. Replies
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    Re: Resin change.

    Parts sticking to the core or cavity?

    Verify fill-only parts - The melt flow from your first material is higher then your new material, you may need to adjust shot size or melt temps as a result....
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    Re: Unstable cushion

    Decompression as well as wet material comes to mind.

    Also if your nozzle ID is too small your cushion will bounce - especially with hot-runner tool. Difficult to get consistent...
  3. Material Selection - PCR Polypropylene

    Hello!

    Been a little while since I've logged in since I've transitioned into a new role with a new company :)

    One of my side projects is investigating recycled or sustainable polypropylene for...
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    Re: Recovery Issues at Start-Up

    Interesting - it's fine once it's running though. So what would cause dosage issues when screw is empty vs screw is full?
    The material enters the screw same way in either condition. So that sort of...
  5. Re: Proper Short Shot - What do you think

    95% - 98% fill by weight comes to mind, regardless of cosmetics
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    Re: Flow Lines?

    would look into machine down time and throughput of your dryer. PET can degrade easily if dried too long
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    Re: Flow Lines?

    Are you drying the material? - Same dryer used every time it runs? Over drying will cause degradation and can cause flow lines
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    Re: Delta E Color Tolerance

    Yes more expensive but arguably very precise to color match. And all the colorant mixing data should be readily available from the supplier.
    Everything comes at a cost though! A cost the customer...
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    Re: Delta E Color Tolerance

    Have you looked into or tested pre-compounded material?
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    Re: Delta E Color Tolerance

    Great question, I'm not familiar with an "industry standard" for color matching variation..
    In the past customer specifies a color, we'll run off a High and Low limit of that color (example 4% at...
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    Re: Injection Molding Mexico

    Wouldn't be able to help you wirh price differences

    However these guys are 100% medical manufacturing and do great work - manufacturing, assembly, automation etc. They have a plant in Costa Rica....
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    Re: Modified gantry crane

    could try these guys

    https://www.hoosiercrane.com/semi-gantry-cranes
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    Re: Modified gantry crane

    Worked with a shop that used a-frames for larger molds and hoist floor crane for smaller molds
    I'm sure there are various load specs you can order

    Not familiar with any type of half gantry though...
  14. Re: Pack and Hold: Van Dorn pathfinder control

    I've found turning the closed loop control off helps pack and hold issues. Also setting the Pack and Hold under VOL to 40 works for me (second image). Think it just changes the rate at which you...
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    Re: Powerline 440 Mold Gate Function

    Can't see the pdf's they're too small, but I've sometimes seen machines set-up similar to an "if-then" statement:

    If screw position during injection sequence is at position 3.0 or smaller, then...
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    Re: Injection Graphic

    Yea a 2nd holding profile, that is correct
    Generally 0.5s or even 1s if your cycle will permit it, so it's nice and easy on your process and machine. Then I'd follow it up with a screw recovery...
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    Re: Injection Graphic

    If you're interested in process control, RJG makes an eDart system you can rig to your machine to capture these types of conditions over months and months, and then have the ability to go back and...
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    Re: Injection Graphic

    Blue line is the speed, your machine inputs from the photo indicate a profiled injection from 5.6in/s > 4.6in/s.2.5in/s then your machine has the option of a Holding Speed, which is set to 1in/s.
    ...
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    Re: Shot Size Procedure

    Should have access to total estimated shot weight, from this you can calculate total shot size. Underfilling a mold is fine, overfilling a mold can be very problematic
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    Re: Loud noise when mould opens.

    There you go! Always nice when someone follows up and resolves the issue.
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    Re: Loud noise when mould opens.

    What nemanja said is a good point, would be good to verify smooth opening speed and pressure profiles.

    I might try removing the side locks to see if it goes away. Hopefully it's binding up on...
  22. Re: Vinyl Record Duplication - best materials to use?

    Check out plastisol a liquid form of vinyl that's cured into a solid

    http://www.chemionics.com/plastisol.html

    Would test it on another record in case.
    Guy in YouTube video may have used...
  23. Re: Vinyl Record Duplication - best materials to use?

    Wow cool idea and video, I actually didin't know this was possible hah.
    Seems like records are made of some type of PVC.
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    Re: Loud noise when mould opens.

    Maybe minor misalignment during high pressure clamp?
    if there's too many slide locks or tapered locking features sometimes mold will bind up during high pressure tonnage; once that tonnage is...
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    Re: Cushion Changes with Pack Time

    So less pack time results in bubbles, more pack time results in no bubbles?
    Sounds like they could be voids. Other conditions that may help are increasing back pressure and/or reducing fill speed
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