Hot-Melt Dispencer

Go ahead, design then. After the prototype is made & tested, upload it on CR4 for all of us to admire.

I am designing a hot-melt dispencer with 5 nozzles. i want it to be calibrated so that i can set a desired intevals between the nozzles. It must withstand temperature up to 200 degree celcious. These nozzles must be within 50cm wide. I need assistance in nozzles and material selection to withstand the anticipated temperature.

What flow rate, viscosity & orifice size are you designing for? What is the material? Is it for intermittent use or continuous flow?

Most the nozzles I have here on my Hot Melt Machines are brass. The nozzle not being heated. Brass helps to conduct heat to the material being dispensed during start up faster from the heated gun on one and heated metering pump on the other. These nozzles make contact with the product so are consumables.

Most of the bulk melter are the same. It's the applicator that is specific to the task at hand. He sure doesn't give much to go on.

"He sure doesn't give much to go on."

He doesn't have much to go on.

I'm guessing it is homework, or might as well be.

christ, not only that, you have to keep the nozzles from cooling off while at the same time not burning the glue. or having the solenoid valves freezing (glued) in a position.

So it is not as simple as nozzle or material selection.

I agree. I don't think he knows what all is involved to make a workable system. Thus the nature of my questions - there's no way a design-from-scratch system is better than one assembled from available parts. Choosing a material of construction for the nozzles is probably the easiest part.

My response was to reinforce your earlier post.

It reminded me of a large panel box builder had a machine that applied the gasket to the panel door. It basically combined a latex type sealant and a catalyst.

The panel box builder worked with the chemical company that supplied the (2) part mixer to build the machine that put on the gasket.

That machine was expensive.

So, I would suggest that this poster work with the hot melt glue supplier, is the actually starting point. It will eliminate a lot of guess work from us.

And in my opinion, this is the best response, but I could be bias.

Go for it.

If it is for you, you will save a lot using this; if it is for a customer you can reduce lead time and increase profit:

I spent a couple of years designing these units. The applicators are usually stainless blades with a 0.01" slot to dispense the hot melt. These are non-contact units. Each slot has a solenoid valve to control the flow. The applicator head has to be heated as is the hose carrying the hot melt to the head. These produce stripes of adhesive but you also get valves with a variety of nozzles to spray one or more lines of adhesive. These are typically used to seal cardboard packaging or similar.

Google the question and you will find what you seek. These are already being produce by several companies.

Is there a point, in re-inventing the wheel?