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Greetings!
Hallo!
Thanks to those whom commented on the last article, it seems to have hit a note amongst some tool makers and molders. In this issue I have put together a short list of vent depths, which you may or may not have. Feel free to add and modify and if you disagree let me know. If you would like the excel version let me know... also what version you are running.
All else seems to be moving along, business seems to be picking up for many as some of my clients have now hired on new folks and been expanding their own capabilities, a good sign for the economy. Anyway hope all are preparing and using the time wisely to upgrade employee knowledge and the facilities.
Keep us in mind for any projects, training and opportunities you may have...
Ta
Steven
silveysplastics@hotmail.com
360-882-3183 |
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VENT DEPTHs |
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Where would you start if no data was available?
compiled by SL Silvey |
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Definition: Vent: to exhaust, serving as outlet for air. Depth: a dimension taken through an object or body of material, usually downward
In the last article on simple things in tool making venting was brought up. The following list is a generic list of materials and their respective vent depths, typically on the conservative side. Meaning that they could be deeper but that is up to the tool maker and or processor to decide. The land area should be approximately 1 mm in length (0.040" approximately) though again some have found 0.030" or 0.100" work in their application, this is again up to the processor and tool marker to decide, especially given that the filling of the part may necessitate a high rate of fill and packing at the same time due to flow to thickness ratios. (Basically using the fill portion of injection to fill, pack and hold)
There are many list out there and this one is by no means complete but does have the majority of materials listed which should be combined with the current ones you are currently using and or a start to the one you shall now generate for your internal use.
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Vent depths for Various materials | |
resins | |
Depth (inches) | |
ABS | |
0.0010 - 0.0015 | |
Acetal | |
0.0005 - 0.0010 | |
Acrylic | |
0.0015 - 0.0020 | |
Cellulose | |
0.0010 - 0.0015 | |
EVA | |
0.0010 - 0.0015 | |
Ionomer | |
0.0005 - 0.0010 | |
LCP | |
0.0005 - 0.0007 | |
Nylon | |
0.0003 - 0.0005 | |
PPO/PS | |
0.0010 - 0.0020 | |
Polycarbonate | |
0.0015 - 0.0025 | |
PET, PBT, Polyesters | |
0.0005 - 0.0007 | |
Polysulfone | |
0.0010 - 0.0020 | |
Polyethylene | |
0.0005 - 0.0012 | |
Polypropylene | |
0.0005 - 0.0020 | |
Polystyrene | |
0.0007 - 0.0010 | |
Polystyrene (HIPS) | |
0.0008 - 0.0012 | |
PVC (ridged) | |
0.0006 - 0.0010 | |
PVC (Flexible) | |
0.0005 - 0.0007 | |
Polyurethane | |
0.0004 - 0.0008 | |
SAN | |
0.0010 - 0.0016 | |
T/P Elastomer | |
0.0005 - 0.0007 |
SL SILVEY
360-882-3183 |
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Some of What we DO!!! |
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The following are some of the services offered:
1- Troubleshooting: assisting in the processing
- At your plant,
- Over the phone, internet, Skype, MS Messenger
- Send us your parts and prints for questions.
2- Plant Audits
3- Training / education programs.
4- Mold optimizations / new mold trials
Missed an issue check out the archives:
http://archive.constantcontact.com/fs034/1101663388820/archive/1102138661635.html
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  Let's Talk and discuss, as parts become more critical for performance, and production falters due to process window narrowness, this may be a solution. At least take us up on helping with the 5-Step process Give me a call 360-882-3183 |
