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#1
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Any spray foam that can expand / cure in a closed bag?
I'm trying to apply some expanding foam to the inside of a closed
garbage bag that's situated between two surfaces that are about an inch apart. I want the foam to take the shape of the irregular surfaces as it expands and hardens, but I don't want the foam to adhere or bond to these surfaces so I've placed an ordinary plastic garbage bag between them and that's where the foam is being injected. I'm discovering that the small amount of foam that's leaking out of the fill-holes is expanding and curing nicely, but the foam inside the bag seems to be semi-solid goop. I'm leaving this over night to see if it's any better tommorrow, but I'm thinking I'm going to need a different sort of product other than "Big Stuff" aerosol can gap filler. I know there's some foam packing material that is isin't particularly messy and I think is applied inside a bag or membrane that conforms to the shape of what-ever is being shipped. Is this stuff available? Any other ideas? |
#2
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Any spray foam that can expand / cure in a closed bag?
Home Guy wrote:
Any other ideas? I see that there's 2-part expanding foam that comes in variety of densities, for marine use, hobby, etc. So you mix 2 parts, and you have maybe 30 seconds or a minute to pour it before it starts to expand. The stuff you buy in an aerosol can - is that 2 parts (and if so, how do they keep the 2 parts separate)? |
#3
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Any spray foam that can expand / cure in a closed bag?
On 9/10/2011 9:50 PM, Home Guy wrote:
I'm trying to apply some expanding foam to the inside of a closed garbage bag that's situated between two surfaces that are about an inch apart. I want the foam to take the shape of the irregular surfaces as it expands and hardens, but I don't want the foam to adhere or bond to these surfaces so I've placed an ordinary plastic garbage bag between them and that's where the foam is being injected. I'm discovering that the small amount of foam that's leaking out of the fill-holes is expanding and curing nicely, but the foam inside the bag seems to be semi-solid goop. I'm leaving this over night to see if it's any better tommorrow, but I'm thinking I'm going to need a different sort of product other than "Big Stuff" aerosol can gap filler. I know there's some foam packing material that is isin't particularly messy and I think is applied inside a bag or membrane that conforms to the shape of what-ever is being shipped. Is this stuff available? Any other ideas? You are on the right track, but I don't think anybody sells one-use packs of the stuff- it is usually a station on the packing line, fed from tanks. I don't suppose your project is portable enough to carry into one of those shipping places? -- aem sends.... |
#4
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Any spray foam that can expand / cure in a closed bag?
On Sep 10, 7:02*pm, Home Guy wrote:
Home Guy wrote: Any other ideas? I see that there's 2-part expanding foam that comes in variety of densities, for marine use, hobby, etc. So you mix 2 parts, and you have maybe 30 seconds or a minute to pour it before it starts to expand. The stuff you buy in an aerosol can - is that 2 parts (and if so, how do they keep the 2 parts separate)? Somebody at work just told me about this stuff, I'd never heard of it. Totally new to me. http://www.ivexpackaging.com/movie.php I always figured that "foamed in place" packing required an expensive setup; tanks, hoses, etc You might try making your bag "tall" and leaving it open on the top edge. Maybe that allow enough access to atmosphere to cure. Play around with the volume of foam you squirt in and let it "grow" towards the open edge. If you get the amount correct you won't get much excess height. The excess can be trimmed off with a utility knife http://www.yamahajetboaters.com/steveprice/tip6.html http://www.ehow.com/how_7405490_use-...packaging.html Seems like the key is using a plastic bag that is not completel sealed. Maybe yours will cure overnight. HTH cheers Bob |
#5
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Any spray foam that can expand / cure in a closed bag?
DD_BobK wrote:
Somebody at work just told me about this stuff, I'd never heard of it. Totally new to me. http://www.ivexpackaging.com/movie.php Ivex Flaskpac. Yea, that's what I was thinking about. I've seen that sort of packaging material at work (we've received stuff that was packed using either exactly that product, or something that worked exactly the same way). If you notice, that is a 2-part expanding foam product. It's just a self-contained version. I still wonder how the single-part "foam in a can" works compared to the 2-part stuff. The foam-in-a-can seems to need exposure to ambient air in order to expand and cure, but the 2-part stuff doesn't. I don't think I'm going to be able to source any 2-part foam locally. The best shot seems to be a hobby or marine products store. I don't think any of the big-box home improvement stores have this stuff. I'll probably have to modify my setup so that I can spray the foam-in-a-can with full exposure to ambient air. |
#6
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Any spray foam that can expand / cure in a closed bag?
On Sep 11, 2:50*am, Home Guy wrote:
I'm trying to apply some expanding foam to the inside of a closed garbage bag that's situated between two surfaces that are about an inch apart. *I want the foam to take the shape of the irregular surfaces as it expands and hardens, but I don't want the foam to adhere or bond to these surfaces so I've placed an ordinary plastic garbage bag between them and that's where the foam is being injected. I'm discovering that the small amount of foam that's leaking out of the fill-holes is expanding and curing nicely, but the foam inside the bag seems to be semi-solid goop. *I'm leaving this over night to see if it's any better tommorrow, but I'm thinking I'm going to need a different sort of product other than "Big Stuff" aerosol can gap filler. I know there's some foam packing material that is isin't particularly messy and I think is applied inside a bag or membrane that conforms to the shape of what-ever is being shipped. *Is this stuff available? Any other ideas? The canned foam needs water to make it set. It gets this from the air. So, in an enclosed space it won't go off unless you spray the surfaces inside with water . Even then it isn't so good sometimes. It sticks to damp surfaces even better than dry. So you need to wet the inside of your bags. But even so, results are variable. If you spray the foam too thick/too big a blob, it won't go off, remaining soft in the centre for a long time. The gas usually escapes eventually leaving a big void inside. The two part foam goes off regardless. |
#7
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Any spray foam that can expand / cure in a closed bag?
On 9/11/2011 4:27 AM, harry wrote:
On Sep 11, 2:50 am, Home wrote: I'm trying to apply some expanding foam to the inside of a closed garbage bag that's situated between two surfaces that are about an inch apart. I want the foam to take the shape of the irregular surfaces as it expands and hardens, but I don't want the foam to adhere or bond to these surfaces so I've placed an ordinary plastic garbage bag between them and that's where the foam is being injected. I'm discovering that the small amount of foam that's leaking out of the fill-holes is expanding and curing nicely, but the foam inside the bag seems to be semi-solid goop. I'm leaving this over night to see if it's any better tommorrow, but I'm thinking I'm going to need a different sort of product other than "Big Stuff" aerosol can gap filler. I know there's some foam packing material that is isin't particularly messy and I think is applied inside a bag or membrane that conforms to the shape of what-ever is being shipped. Is this stuff available? Any other ideas? The canned foam needs water to make it set. It gets this from the air. So, in an enclosed space it won't go off unless you spray the surfaces inside with water . Even then it isn't so good sometimes. It sticks to damp surfaces even better than dry. So you need to wet the inside of your bags. But even so, results are variable. If you spray the foam too thick/too big a blob, it won't go off, remaining soft in the centre for a long time. The gas usually escapes eventually leaving a big void inside. The two part foam goes off regardless. Decent article on chemistry: http://en.wikipedia.org/wiki/Polyurethane Bubbles in the foam are from carbon dioxide liberated when isocyanate reacts with water. In a two parter water could be in the polyol and two parter is needed by op. |
#8
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Any spray foam that can expand / cure in a closed bag?
Frank wrote:
I'm trying to apply some expanding foam to the inside of a closed garbage bag that's situated between two surfaces that are about an inch apart. I'm discovering that the small amount of foam that's leaking out of the fill-holes is expanding and curing nicely, but the foam inside the bag seems to be semi-solid goop. I'm leaving this over night to see if it's any better tommorrow The canned foam needs water to make it set. It gets this from the air. So, in an enclosed space it won't go off unless you spray the surfaces inside with water. Decent article on chemistry: http://en.wikipedia.org/wiki/Polyurethane Bubbles in the foam are from carbon dioxide liberated when isocyanate reacts with water. In a two parter water could be in the polyol So this morning the foam inside the bag was still a mix of ridgid or cured/expanded parts and a lot of goo-ee parts. So I poured a couple of cups of warm water in from the top, which saturated everything in the bag for a short time before leaking out the bottom through some holes I didn't know were there. No detectable change in the goo factor. So I take everything apart and put it on a horizontal surface and open up the bag. Some expansion and curing did happen naturally, but the water treatment had no effect. Most of what was there was skinned over, encapsulating large pockets of goo. When I broke the skin, it seemed to just stayed in a goo phase or state, with no tendency to immediately start to expand and harden. Maybe this will eventually happen if I leave it exposed to air for another few days, but something has certainly changed the pace at which the goo expands and hardens. So there must be some time factor involved beyond just making sure this stuff is exposed to ambient, humidified air. and two parter is needed by op. Too expensive, and too hard to source locally. |
#9
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Any spray foam that can expand / cure in a closed bag?
On Sep 10, 9:13*pm, Home Guy wrote:
DD_BobK wrote: Somebody at work just told me about this stuff, I'd never heard of it. *Totally new to me. http://www.ivexpackaging.com/movie.php Ivex Flaskpac. Yea, that's what I was thinking about. *I've seen that sort of packaging material at work (we've received stuff that was packed using either exactly that product, or something that worked exactly the same way). If you notice, that is a 2-part expanding foam product. *It's just a self-contained version. I still wonder how the single-part "foam in a can" works compared to the 2-part stuff. The foam-in-a-can seems to need exposure to ambient air in order to expand and cure, but the 2-part stuff doesn't. I don't think I'm going to be able to source any 2-part foam locally. The best shot seems to be a hobby or marine products store. *I don't think any of the big-box home improvement stores have this stuff. I'll probably have to modify my setup so that I can spray the foam-in-a-can with full exposure to ambient air. The other two links I posted gave experiences about using canned foam sprayed into bags. I have no direct experience but it seemed like the links were applicable esp the Yamaha one.' cheers Bob |
#10
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Any spray foam that can expand / cure in a closed bag?
On Sat, 10 Sep 2011 20:21:31 -0700 (PDT), DD_BobK
wrote: On Sep 10, 7:02Â*pm, Home Guy wrote: Home Guy wrote: Any other ideas? I see that there's 2-part expanding foam that comes in variety of densities, for marine use, hobby, etc. So you mix 2 parts, and you have maybe 30 seconds or a minute to pour it before it starts to expand. The stuff you buy in an aerosol can - is that 2 parts (and if so, how do they keep the 2 parts separate)? Somebody at work just told me about this stuff, I'd never heard of it. Totally new to me. http://www.ivexpackaging.com/movie.php I always figured that "foamed in place" packing required an expensive setup; tanks, hoses, etc You might try making your bag "tall" and leaving it open on the top edge. Maybe that allow enough access to atmosphere to cure. Play around with the volume of foam you squirt in and let it "grow" towards the open edge. If you get the amount correct you won't get much excess height. The excess can be trimmed off with a utility knife http://www.yamahajetboaters.com/steveprice/tip6.html http://www.ehow.com/how_7405490_use-...packaging.html Seems like the key is using a plastic bag that is not completel sealed. Maybe yours will cure overnight. HTH cheers Bob Urethane foam requires moisture to set. In a sealed plastic bag there is no moisture, so it never "kicks off" the reaction. You could try misting the inside of the bag lightly with water before injecting the foam. |
#11
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Any spray foam that can expand / cure in a closed bag?
Home Guy wrote:
I'm trying to apply some expanding foam to the inside of a closed garbage bag that's situated between two surfaces that are about an inch apart. I want the foam to take the shape of the irregular surfaces as it expands and hardens, but I don't want the foam to adhere or bond to these surfaces so I've placed an ordinary plastic garbage bag between them and that's where the foam is being injected. I'm discovering that the small amount of foam that's leaking out of the fill-holes is expanding and curing nicely, but the foam inside the bag seems to be semi-solid goop. I'm leaving this over night to see if it's any better tommorrow, but I'm thinking I'm going to need a different sort of product other than "Big Stuff" aerosol can gap filler. I know there's some foam packing material that is isin't particularly messy and I think is applied inside a bag or membrane that conforms to the shape of what-ever is being shipped. Is this stuff available? Any other ideas? If your concerned if it will set up inside, try a test. I have added foam to Coleman coolers and the like. I may take a day or two. It sets up internally when you make a ball, so I don't think it need air. All the small cheap coolers have no insulation in the top. Heat radiates in all directions. Greg |
#12
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Any spray foam that can expand / cure in a closed bag?
On Sep 11, 4:40*pm, Home Guy wrote:
Frank wrote: I'm trying to apply some expanding foam to the inside of a closed garbage bag that's situated between two surfaces that are about an inch apart. I'm discovering that the small amount of foam that's leaking out of the fill-holes is expanding and curing nicely, but the foam inside the bag seems to be semi-solid goop. I'm leaving this over night to see if it's any better tommorrow The canned foam needs water to make it set. It gets this from the air. *So, in an enclosed space it won't go off unless you spray the surfaces inside with water. Decent article on chemistry: http://en.wikipedia.org/wiki/Polyurethane Bubbles in the foam are from carbon dioxide liberated when isocyanate reacts with water. *In a two parter water could be in the polyol So this morning the foam inside the bag was still a mix of ridgid or cured/expanded parts and a lot of goo-ee parts. *So I poured a couple of cups of warm water in from the top, which saturated everything in the bag for a short time before leaking out the bottom through some holes I didn't know were there. No detectable change in the goo factor. So I take everything apart and put it on a horizontal surface and open up the bag. *Some expansion and curing did happen naturally, but the water treatment had no effect. *Most of what was there was skinned over, encapsulating large pockets of goo. * When I broke the skin, it seemed to just stayed in a goo phase or state, with no tendency to immediately start to expand and harden. *Maybe this will eventually happen if I leave it exposed to air for another few days, but something has certainly changed the pace at which the goo expands and hardens. So there must be some time factor involved beyond just making sure this stuff is exposed to ambient, humidified air. and two parter is needed by op. Too expensive, and too hard to source locally.- Hide quoted text - - Show quoted text - If the foam is in too big a blob, the air/moisture does not penetrate to the centre to make it go off. The goo in the middle is "unexpanded" foam (ie lost its gas) |
#13
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Any spray foam that can expand / cure in a closed bag?
On Sep 11, 4:40*pm, Home Guy wrote:
Frank wrote: I'm trying to apply some expanding foam to the inside of a closed garbage bag that's situated between two surfaces that are about an inch apart. I'm discovering that the small amount of foam that's leaking out of the fill-holes is expanding and curing nicely, but the foam inside the bag seems to be semi-solid goop. I'm leaving this over night to see if it's any better tommorrow The canned foam needs water to make it set. It gets this from the air. *So, in an enclosed space it won't go off unless you spray the surfaces inside with water. Decent article on chemistry: http://en.wikipedia.org/wiki/Polyurethane Bubbles in the foam are from carbon dioxide liberated when isocyanate reacts with water. *In a two parter water could be in the polyol So this morning the foam inside the bag was still a mix of ridgid or cured/expanded parts and a lot of goo-ee parts. *So I poured a couple of cups of warm water in from the top, which saturated everything in the bag for a short time before leaking out the bottom through some holes I didn't know were there. No detectable change in the goo factor. So I take everything apart and put it on a horizontal surface and open up the bag. *Some expansion and curing did happen naturally, but the water treatment had no effect. *Most of what was there was skinned over, encapsulating large pockets of goo. * When I broke the skin, it seemed to just stayed in a goo phase or state, with no tendency to immediately start to expand and harden. *Maybe this will eventually happen if I leave it exposed to air for another few days, but something has certainly changed the pace at which the goo expands and hardens. So there must be some time factor involved beyond just making sure this stuff is exposed to ambient, humidified air. and two parter is needed by op. Too expensive, and too hard to source locally.- Hide quoted text - - Show quoted text - BTW, On the can are temperature limits you can use the foam at. Too cold and it won't set either. |
#14
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Any spray foam that can expand / cure in a closed bag?
On Sep 12, 3:47*am, harry wrote:
On Sep 11, 4:40*pm, Home Guy wrote: Frank wrote: I'm trying to apply some expanding foam to the inside of a closed garbage bag that's situated between two surfaces that are about an inch apart. I'm discovering that the small amount of foam that's leaking out of the fill-holes is expanding and curing nicely, but the foam inside the bag seems to be semi-solid goop. I'm leaving this over night to see if it's any better tommorrow The canned foam needs water to make it set. It gets this from the air. *So, in an enclosed space it won't go off unless you spray the surfaces inside with water. Decent article on chemistry: http://en.wikipedia.org/wiki/Polyurethane Bubbles in the foam are from carbon dioxide liberated when isocyanate reacts with water. *In a two parter water could be in the polyol So this morning the foam inside the bag was still a mix of ridgid or cured/expanded parts and a lot of goo-ee parts. *So I poured a couple of cups of warm water in from the top, which saturated everything in the bag for a short time before leaking out the bottom through some holes I didn't know were there. No detectable change in the goo factor. So I take everything apart and put it on a horizontal surface and open up the bag. *Some expansion and curing did happen naturally, but the water treatment had no effect. *Most of what was there was skinned over, encapsulating large pockets of goo. * When I broke the skin, it seemed to just stayed in a goo phase or state, with no tendency to immediately start to expand and harden. *Maybe this will eventually happen if I leave it exposed to air for another few days, but something has certainly changed the pace at which the goo expands and hardens. So there must be some time factor involved beyond just making sure this stuff is exposed to ambient, humidified air. and two parter is needed by op. Too expensive, and too hard to source locally.- Hide quoted text - - Show quoted text - BTW, On the can are temperature limits you can use the foam at. Too cold and it won't set either.- Hide quoted text - - Show quoted text - US composites sells small quantites of 3 part foam in various densities. The 2lb stuff is porbably good for your project. |
#15
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Any spray foam that can expand / cure in a closed bag?
Or dont use an airtight bag. Have you considered trying a light linen or cotton based fabric bag?
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#16
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Any spray foam that can expand / cure in a closed bag?
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