A bubble in the sprue in your situation sounds like it is a void and not a bubble.
Type: Posts; User: Coryhoeppner; Keyword(s):
A bubble in the sprue in your situation sounds like it is a void and not a bubble.
Years ago I paid more for material that was fines separated prior to delivery. I had a Pelletron deduster inline with the dryer. I also utilized hopper filtration at the machine as well. Hope this...
With those MFR's shown. I have personally seen a 20% MFR change within 1 gaylord before. The number placed on your incoming paperwork is simply an average for the lot of material that filled your...
Name of plastic resin Melt flow rate
Polypropylene 5 to 60
Polystyrene 5 to 25
AS resin 10 to 40
ABS resin 5 to 60
Acrylic resin 1 to 35
Polyamide 6 10 to 80
Polyamide 66 10 to 80...
I would start by looking up the following materials PSU (Polysulfone), PES (Polyethersulfone), PEI (Polyeherimide), PAI (Polyamide-imide) and PEEK (Polyetheretherketone). See if one of these types...
Most likely this is made from an injection molding process. Vacuum forming process is highly unlikely.
yangozugar,
Be cautious when comparing plastic materials based on MFI. MFI can only be compared with like materials such as PP & PP. If you were to compare PP and PE that is like comparing an...
I recommend using progressive components black nitride components.
It sounds like you would benefit from mold flow software training.
Pictures of the defect will definitely help.
Please remember to give an update after the implementation. Thanks
I have used Bales Nibore coating on molds producing TPU parts with great results.
I used to have the mold builder achieve diamond 15 polish and then vapor hone finish prior to adding this coating. ...
Pictures of this defect would be great. But I believe that you are referring to jetting or record grooving.
I have developed a family mold with 5 dissimilar cavities. The mold used sequential valve gates and my process was predicted based on simulation from RJG Inc.
yabgozugur,
I believe that you are asking the form of transfer from velocity to pressure.
If that is the case: 1st choice from your list should always be ram position.
Changes in material...
Check out https://rjginc.com/training/registration/ they have great courses.
I have a lot of experience with BMC as well.
KM is a great machine for molding BMC (as @douginky mentioned). The venting and gate cutting is very useful for manufacturing operations. BMCI is a...
smartvn2020,
I would invite you to PM me and we can discuss your issues further.
Thanks,
Cory
Horeki,
It appears that you have a coefficient of friction issue preventing the product from being ejected. Is the mold coated?
I would be curious of the water circuitry (how many gpm, pressure,...
This is something that the RJG TZERO team specialize in. You should look them up if you still need help.
I second Bryan's thoughts on this subject matter. If you would like to PM me I could give you my email address to possibly aid further.
RJG Inc offer classes for all sorts of topics for plastics injection molding as well.
Water can be very problematic to injection molds and machines. I once had the same issues with water at a company that i worked for. This led to an extreme build up of calcium carbonate inside...
PC/ABS is a material that I would try to refrain from using cashew gating and subgating. The % of ABS is definitely critical if you are gating on a class A part. PC does not play nice with cashew...
Joel JS,
If this were my choice... From prior experience with this combination I would refrain from this at all costs. As others have mentioned, any amount of downtime can be very detrimental to...