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  1. Replies
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    Re: Viscosity Study

    Based on my experience with Van Dorn HT series within the vintage years you mention your comment "maybe machine related" is highly likely. Specifically when you run with the processes in the Closed...
  2. Thread: Pressure Gap

    by Bryan E
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    826

    Re: Pressure Gap

    The setup as you described it is correct and will provide consistent parts shot to shot. Maximum Injection Pressure is the maximum pressure you will have available during the injection cycle. The...
  3. Re: “Splay” issue on PA66 GF30% with UV stabiliser.

    Kayl33
    A little more information would be helpful, What are your drying temperatures? What are the barrel temperatures settings on the machine and what are the temperature settings for your manifold...
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    1,912

    Re: Deduster recommendation for PMMA

    A few years back for me running PMMA, but we had the same issues with white specks on a clear lens product line and after in-depth research and experiments we found that the material causing the...
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    Re: Please Help ID Mold...

    I think that is the proto-type tooling for the Roll Master (smart) garage door opener, it was in development after Roll Master moved from California to Seguin, Texas to reduce costs and stay...
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    Re: Machine is not responding

    You didn't mention if the pumps start and/or if any information is posting on the screen when you apply power. Also does the PLC/controls appear to go through a boot cycle when you apply power. If...
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    Re: Nylon 6 Brittle parts

    Equally important is to make sure you are not over drying the material prior to production. A nylon 6/6 or heat stabilized nylon may yield better performance.
  8. Re: Suggestions to help part stick to the movable plate

    I would start with spraying the stationary side with a mold release, based on the area you spray and the number of cycles you can run between spray should be able to help you determine which...
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    Re: Trueblood 30-ton help needed

    Hey Chuck,
    Just looking at the panel pic it looks to me the slow close 1 and 2 positions are not correct, as the clamp is closing on fast close it will reach the slow close 1 position first then...
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    Re: Material Drooling

    Agree with all the questions from nemanja, just wanted to mention there are nozzle tips designed specifically for nylon that will help. Making sure the material is dry is top of the list, But keep in...
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    Re: Breakage of Nozzle tip

    There should be a pressure adjustment to reduce the hydraulic pressure that is being applied to the injection unit when moving the injection unit forward and/or during the injection of plastic... If...
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    Re: Molding around a bearing

    We ran nylon wheel bearing parts that required press fit assembly in different configurations including what you are describing. We never found a successful process that would produce consistent...
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    Re: White streaks or spots

    Based on your description listed above and the defect shown I would suggest you check your nozzle heater bands and or thermocouple. It appears your injecting a cold slug of material because of the...
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    Re: Sandretto Series 7 with SEF 90 Control.

    MATCHING THERMOCOUPLE TYPES TO THE COLOR CODES

    Each type of thermocouple has multiple colors associated with it. Standard grade and extension grade wire have their own respective colors, while the...
  15. Re: Intermittent screeching noise during plasticising stage

    I would start by checking the temperature at the feed throat to make sure it's not getting too much cooling. Next you probably should confirm each heater band is working, it is possible for a zone to...
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    17,588

    Re: 1996 Cincinnati VT220 Error! E00077

    Richard
    Can you send me the serial number and confirm which controller you have? Also do you have the program for the machine and just need support reloading the program. Where are you located? It...
  17. Thread: Back Pressure

    by Bryan E
    Replies
    8
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    22,765

    Re: Back Pressure

    Depending on what molding machine your working with you will likely be limited to approximate 300 psi maximum (hydraulic pressure), 150 to 200 psi of back pressure is typically a good range for most...
  18. Re: Best Auxillaries Setup for 270TIM machine for preforms

    The correct answer to your question should be based on the number of water circuits and the diameter of the water lines going through the mold. Just going by assumption based on a 270T machine with a...
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    Re: Too much shrinkage

    The check ring or worn barrel will make a big difference in controlling the size of the part. Especially with Nylon 6/6. Your barrel temps, dryer temps and mold temps. are inline with Dupont...
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    Re: Conformal Cooling equipment

    I copied you a couple of links that will be able to help you, you should be able to use standard equipment for your cooling unless the tooling requires really small water lines or if your water...
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    Re: Excessive contraction on cores.

    Very nice job troubleshooting as a group and thanks for the final feedback on what resolved this issue.
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    1,175

    Re: injection mold design material

    Check out https://www.dupont.com General Design Principles for DuPont Engineering Polymers module 1 and module 2. Although it is specific to Engineering grade materials the basic principals are...
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    Re: Water System Back Pressure

    Based on what you are saying I agree it sounds like the temperature control unit. Is it possible to swap the unit with the one from machine B? It is interesting that two same brand unit have the...
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    Re: Design for PIM, maximum thickness strictness?

    I don't have any specific PIM shop's to recommend other then to be open minded to the smaller PIM shops as well. There are a lot of good molding operations, small shops that do everything right...
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    Re: Design for PIM, maximum thickness strictness?

    This is a very good question, Starting with the last question first, Yes it common where the design recommendations are ignored and sometimes it is successful. Many times it not because of warping...
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