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  1. Replies
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    Re: Enhancing flow properties of resin

    Some ideas:
    increasing mold temp will improve flow
    Increase plastic melt temp will improve flow
    fast injection speed is your friend
    Open up gates


    If you're pressure limited, Read up on a...
  2. Hot-Runner/Mold Cable Configuration Standard

    Hi All,

    Anyone know of a known ISO, ASTM or some other standard for Hot-Runner/Mold Cable configuration?

    We have an internal standard generally 24 pin 12 zone Han B connections, keeping power...
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    Large Injection Mold Pallets

    Hi All,

    Looking for ideas to store/move around injection molds in the 5,000 lb range.

    Steel pallets?
    Heavy duty plastic pallets?

    What do you guys use?

    Links or photos appreciated
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    Steel drawing revision control

    Hi All -

    Putting my feelers out there to understand different methods of controlling steel drawings.
    We have the scenario where same plastic part # may be produced on 4 or 5 different molds -...
  5. Re: Which manufacture has the best after sales support in your experience?

    Arburg has always had best service in my experience, a lot depends on your location.
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    Tooling RFQ Ideas?

    Putting together a quick reference spreadsheet for Tooling Request For Quote (RFQ). Basically just key tooling attributes when looking around for tooling quotes.
    Want to hear what others are doing?...
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    Recyclability in product

    Hello!

    I recently transitioned from medical plastics industry into outdoor industry - yahoo!

    I'm exploring marketing a premium insulated water bottle as "100% recyclable"
    Sort of goofy...
  8. Re: Three resin lots required for part qualification

    I've run 3 lots of resin many times, but only if customer requires it.
    The work-around is justification of a robust processing window. The argument is if you qualify a higher injection speed +...
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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...
  11. 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...
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    Re: Proper Short Shot - What do you think

    95% - 98% fill by weight comes to mind, regardless of cosmetics
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    5,202

    Re: Flow Lines?

    would look into machine down time and throughput of your dryer. PET can degrade easily if dried too long
  15. Replies
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    5,202

    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?
  18. Replies
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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...
  22. 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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