10 replies to this topic

[ROWINGADUBAY]

I was looking at these "paint pressure tank" from harbour frieght I was wondering if you put a mixer inside and a spout out the side set it on a hot plate or" maybe fit a presto pot inside of it " and hooked it up to the air compressor would you have a plastisol injector? The tricky part would be to control the flow of plastic I am thinking something lie a toggle or push button valve
( at a low psi and yes it does have a safety valve)


http://www.harborfre...tank-66839.html

[Dakotakole]

That looks like it might work.also to control the flow of plastic at low pressure u could incorporate a flow control valve matching that up with the air pressure coming in the only thing to try is putting water through it and see what kind of flow rate u get. I wouldnt be so worried about the flow as I would controlling the temp. As for the spout I have tried something like that and my problem was the plastic was to temp but when i would crack the valve to let the plastic flow the valve would clog up due to that part not getting warm like the pot or plastic. Hope it works for you let us know If you are successful

Steve

[powerworm]

bear used to sell one with either 1 or 2 paint pressure pots but was alot more complicated than what you are describing and expensive also. i see they have since chnged the tanks to hold the liquid plastic but i am sure there were a few sold..

[ROWINGADUBAY]

Dakotakole, on 09 February 2012 - 02:31 PM, said:

That looks like it might work.also to control the flow of plastic at low pressure u could incorporate a flow control valve matching that up with the air pressure coming in the only thing to try is putting water through it and see what kind of flow rate u get. I wouldnt be so worried about the flow as I would controlling the temp. As for the spout I have tried something like that and my problem was the plastic was to temp but when i would crack the valve to let the plastic flow the valve would clog up due to that part not getting warm like the pot or plastic. Hope it works for you let us know If you are successful

Steve

I was worried about the same thing but a regular ball valve is what is used on a presto pot and that is what this would sort of be just with air pressure pushing the plastic out I was actually worried about to much flow.
I found a couple of good valves from gainger that would open and close faster than a ball valve but at a premo price I will just try the ball valve for testing
I think I will try out the theory in a pressure cooker first then I can upsize with a mixer and all of that later the hard part is spending the time and money only to make a piece of scrap metal but I think this will work wether or not it will be safe is another story

[ROWINGADUBAY]

I found these when searching around they sre for wax but I think this is the direction I am headed with this only on a simpiler scale
http://www.laneindus...x_injectors.htm

[Travis]

ROWINGADUBAY, on 09 February 2012 - 12:27 PM, said:

I was looking at these "paint pressure tank" from harbour frieght I was wondering if you put a mixer inside and a spout out the side set it on a hot plate or" maybe fit a presto pot inside of it " and hooked it up to the air compressor would you have a plastisol injector? The tricky part would be to control the flow of plastic I am thinking something lie a toggle or push button valve
( at a low psi and yes it does have a safety valve)


http://www.harborfre...tank-66839.html

Yes it would work if you get everything set up right and made sure everything was compatible with the plastic, off gassing, and temperatures.

Pressure Pot - LureCraft

[Cormorant Lures]

So, is the above mentioned pot from Lurecraft made for injecting or pouring?!? It's confusing to me when the description says "High Pressure Pouring Pot"...

[Bob La Londe]

Travis, on 10 February 2012 - 07:40 AM, said:

Yes it would work if you get everything set up right and made sure everything was compatible with the plastic, off gassing, and temperatures.

Pressure Pot - LureCraft

Cormorant Lures, on 10 February 2012 - 11:17 AM, said:

So, is the above mentioned pot from Lurecraft made for injecting or pouring?!? It's confusing to me when the description says "High Pressure Pouring Pot"...

Looks to me like a larger version of the pressure system Jacob's makes.

If I was going to make a pressure injection system I would probably start with a paint pot or a pressure cooker pot myself. Something designed by somebody else to take much higher pressure than bait injection to start with. That one looks like a commercial automotive paint pot to me. Frank would know for sure if we could get him to take a look at it.

Given the size and materials the price seems about right. 5 gallons at a time huh? Cool. Ok. Hot. LOL

[Frank]

They both are made for painting. I have one of the harbor freight ones. Not some thing I would fill up with hot plastic it just lacks the quality I would want. Now the one from LC is a differant story totally. It looks like a Binks pressure pot very high quality and I would use that one,but as you can see by the price it is not cheap. By the time you are done trying to heat and stirring the HF one the price will be up there close to the Jacobs unit. Frank

[carolinamike]

Guys I've built one of these injectors. You can build one safe for around $800-$1000 bucks. I also bought one of Lurecrafts. I don't know if things have changed now but when I bought mine, they were only sold by Lurecraft. The guy that makes them use to own Lurecraft. On Lurecraft's model, it's made very cheaply with no safety considerations taken in mind. A good example is the air regulator that is actually attached to the lid of the pot. Mine used brass piping to connect it. The regulator is not made to be heated. The price is just really too much for what they offer. There's some other safety issues and also the stirring motor is very cheap too. And I definitely would not use a painting pot. These are not made to be heated. I do know a couple of guys that have made them out of painting pots, the rubber gaskets aren't heat proof. One guy actually ended up making his own mold to make his own gasket out of RTV. The best thing to use is an All-American pressure cooker, these have a metal to metal seal with no gasket and are safe up to around 20 psi. Another thing to keep in mind, if you're going to make your own, where ever you're purchasing your cooker from don't tell them what you're going to do with it. If you're going to use it for anything else besides cooking or canning, the distributors cannot knowingly sell them for any other purpose. Building them is not that hard, but to do it right, it is time consuming. You can buy all your heating elements and heat controls from Thermal Corp. You can get a heavy duty gear motor from Grainger. These are the basic things you'll need to get started. You can also put a heat band on a purchased valve or you can build a heated valve yourself. Also keep in mind you will need some machining work done and someone that really knows what they're doing to weld the aluminum. Add a safety pop off valve (18psi) and you're good to go. I still use one to shoot prototypes for other companies. I've actually used my lid with my stirrer and the bottom part of Lurecrafts. The heat band and heat controls that are on Lurecrafts are of high quality, but after building my own I was very disappointed in the lid that came with the Lurecraft pot. I bought my pot about 6 years ago, I was told that the heating controls had a whole lot more functions but I never received any instructions, even after calling and asking, I'm still 6 years later waiting on the instructions for the heat controls.

[SlowFISH]

I just did a quick search.... and there seems to be a bunch of wax injectoin molding pots out there... just can't tell how how they get the wax, most seem to stop around 250F.... although I saw one site listing products that woul heat up to 550F. Seems like these pots/injectors would be a good cross over as they have the same saftey issues with hot plastisol and come in a variety of sizes from 1 pint to gallon size and bigger...

One company I saw was the Pro-Craft Grobet Wax Injector... they even have a 1 pint version that has a hand articulated pump.

J.