Anyone use packing?

[John A.]

I know that packing isn't a feasible option for many traditional silencer baffles and designs.

But with reflex and integral designs, or perhaps certain monocore designs, packing could be used. And would probably benefit it quite a bit. And especially those that are directly under the handguard where your hand is.

I've seen shoelace eyelets be used, copper chore boy scouring pads, stainless steel wool and even BB's used.

But I've never heard of anyone using muffler packing.

And I also know that there's several different kinds of packing out there. For 2 and 4 stroke engines, and which the steel wool or fiberglass strands tend to burn out rather quickly for most types.

But for my upcoming integral, I'm going to be using Thermal Zero Ceramic wrap. Supposedly good to 2300* F, and should give it some improved acoustic dampening too

The company says their wrap are often used around furnaces, kilns, and forges. From the video below, it looks like it's exactly what I've been looking for.

https://www.youtube.com/watch?v=F224ZYLNLu0

[doubloon]

Have you looked at Roxul. Available from the orange home store and probably cheaper.

[John A.]

Nope hadn't ever heard of it.

But the one I saw for sound attenuation, was only available in fiber board type sheets, rather than packing.

[FrugalFred]

I like melamine sponges saturated with water in my reflex camber. As far as I can tell it doesn't actually melt it just turns to carbon. Works as a really nice water injection system.

[doubloon]

Nope hadn't ever heard of it.

But the one I saw for sound attenuation, was only available in fiber board type sheets, rather than packing.

Roxul makes a board material too called Comfortboard.

http://www.homedepot.com/p/Roxul-Comfor ... /206789748

They also have a wrap product.

The Roxul products provide acoustic attenuation as well as being noncombustible, something like 2200 degrees.

[fishman]

I think the octave shotgun silencer uses packing. I'm not sure what kind

[Historian]

<< https://www.twpinc.com/16-mesh-brass-42 >>

#16 bronze mesh has been used in 'pre-historic' times in
tubes.

Some topologies:
cylinder like a jelly roll;

wrapped around an inside slotted tube, e.g. shape example:
<< https://jet.com/product/detail/3d665629 ... dce192adff >>

[Capt. Link.]

I know that packing isn't a feasible option for many traditional silencer baffles and designs.

But with reflex and integral designs, or perhaps certain monocore designs, packing could be used. And would probably benefit it quite a bit. And especially those that are directly under the handguard where your hand is.

I've seen shoelace eyelets be used, copper chore boy scouring pads, stainless steel wool and even BB's used.

But I've never heard of anyone using muffler packing.

And I also know that there's several different kinds of packing out there. For 2 and 4 stroke engines, and which the steel wool or fiberglass strands tend to burn out rather quickly for most types.

But for my upcoming integral, I'm going to be using Thermal Zero Ceramic wrap. Supposedly good to 2300* F, and should give it some improved acoustic dampening too

The company says their wrap are often used around furnaces, kilns, and forges. From the video below, it looks like it's exactly what I've been looking for.

https://www.youtube.com/watch?v=F224ZYLNLu0

Glass Packing has been used since WWII and in more recent times by AWC in the R1/R10.Diffusion packing as in mesh or shoe-lets works so much better.I would hate to see you pursue a dry hole even with this novel product.
-CL

[John A.]

The ceramic packing should be delivered tomorrow.

It is a thick woven mesh. And will probably not be as tightly woven after I cut it.

It is often used in muffler repack, only has better heat resistant properties than fiberglass packing.

[T-Rex]

Are you planning to use any type of perforated divider/cylinder so the gases are allowed to use the full length of the chamber? Just stuffing the packing in there, even loosely, seems as though it would hinder gas flow (into the chamber).

[John A.]

Yes, but a bit different from a simple perforated tube like in a car muffler.

First, I plan to wrap the ported barrel with it around the integral/reflex chamber. There's a ton of room in there, and the ported gas from the barrel is obviously at the highest pressure considering it's exiting the barrel bore behind the bullet.

Next, while I'm not going to wrap the internal ported muzzlebrake so it will direct the expansion chamber gasses back into the reflex chamber uninhibited because of how I am making the internal shape will have a high and low pressure side in the expansion chamber, the next 3.5" past the muzzlebrake is a monocore section that looks a lot like a toy ray gun that is ported that I believe that I would like to try to wrap to see how it will sound.



The ports between the monocore baffles are large. And there are 4 of them around the circumference of the monocore. And also not all aligned with the next chamber. I ported it intentionally offset from the chamber before and after it to create as much disruption in there as I can.

As for adding the wrap behind my proprietary baffles that will be forward of the monocore, I probably won't wrap them with the ceramic wrap because the pressure will be pretty low by the time it reaches the last few baffles. I'm thinking about just leaving them open so they'll simply retain as much gas as it will. And it kind of falls back on my "secondary expansion chamber" topic that we were discussing a while back. The more gas that it holds, the more quiet it's going to be.

[Paco664]

this wrap... is it like the high temp exhaust wrap that you can buy at the local auto parts store for wrapping headers or motorcycle exhaust??
also.. for .22lr or other caliber in a slow fire weapon *(bolt) where the heat of rapid or full auto fire won't really be an issue has anyone tried any of the sound absorbing tapes such as the second link i posted here?? *(on the exterior not interior)


https://www.summitracing.com/parts/the- ... IZEALw_wcB

http://www.soundproofcow.com/product/qu ... o3EALw_wcB

[John A.]

No, the wrap that I am getting is more like insulation or pillow batting.

But I have looked at the first link. The wrap that is made out of lava dust.

I have also wondered what would happen if you were to coat the inside of spacers with flex seal. Just to see how/if it would deaden some of the sound? I would think it would absorb some of the sound/vibration. Or at least dull it some.

[T-Rex]

You could, also, wrap the exterior with an insulator/barrier (Nomex, Carbon X, etc) and use an outer wrap of high temp heat shrink tubing. The tight wrap, coupled with insulation/thermal barrier should help mitigate sound from the suppressor's metal body.

[John A.]

^To add to the above comment, I wasn't talking about wanting to try the flex seal on the spacers for high pressure and heat rifle rounds.

I'm talking about low pressure stuff that'll have full powder burn before it leaves the barrel. Lower heat stuff.

[Historian]

John A., your fanciful pistol design is reminiscent of the 1940's Buck Rogers Ray Pistol.

Super!

If you ever make one in .22 please post as I would be the first to purchase.

May I ask how you so effectively rendered your concept?


Best.

[partsguy22]

As far as the coatings in the inner parts what about simple carbon build up ... My .22 can seems to develop about a 1/16" layer in no time I wonder how effective that is at dampening sound vs bare metal?

Would a simple suppressor cover aid in sound dampening vs a bare tube?

[John A.]

Historian, I sent you a PM.

partsguy, I haven't noticed any sound difference while using a silencer cover.

[Historian]

Who can help me read PMs => "Not Allowed to Read Messages on Hold"
( esp. JohnA's)

Huh?

Even cleaned out some old ones and to no avail.

Thanks to any help.

[John A.]

I was able to open your PM and replied back.

The reply doesn't show in my outbox (like it has been read). It shows in my sent folder.

Weird ????

[doubloon]

I was able to open your PM and replied back.

The reply doesn't show in my outbox (like it has been read). It shows in my sent folder.

Weird ????

It waits in the sent folder until the recipient picks it up, opens it.

One of the eccentric behaviors of bulletin board designs.

[Historian]

Weird is not the word for it. Robert said he has never seen this
before. Guess we have found a quirk in the code-stub of this
board.

Have been able to receive PMs in past whenever I got notification in email
that a PM awaiting. Even now "Private Msgs" heading says nothing there.

Rod Serling , where are you now that we need you!!

JohnA, will really look forward to your PM when HAL* (ref. 2001 Kubrick )
gets over its infarc.


* Factoid: letter transpose/ HAL <<== IBM

[Sergeant]

I have plans on the drawing board (or back burner) for a reflex with copper tubing coiled with both ends vented to the atmosphere. I think it would have to be a fairly large diameter tube and would have to be silver soldered inplace. Not likely to be any giant leap of suppressor design or even a small step for a man. So it remains on the back burner.

[John A.]

I look forward to hearing how it works out.

[Paco664]