Recent content by spiridij

Thanks for the replies, let me clarify. The device is small (roughly 1" x 0.5" x 0.25"), single use only, medical device and has two chambers separated by a thin metallic membrane. I'm looking for a way to seal the two outer housings to each other and sandwiching the membrane between them. I...

Does anyone have any experience with creating a hermetic seal on metal housings that are sandwiching a thin metal membrane? I'm told overloading will have its challenges since there will likely always be a fluid leak path between the metal and the plastic.

No, unfortunately we will need to store the material. We are going to be running bulk stability experiments so we are looking into storage solutions.

Hello, We have a highly viscous paste emulsion that we are having a hard time keeping stable. We currently use a kitchen-aid mixer to mix it and we transfer it from the mixing bowl into a sheet of saran and then into a sealed jar. This isn't working since we need to open the jar to pull...

IRstuff, that may be worth another shot. The paste is around 500,000 cP, do you have a suggestion on agitating it? John

Thanks Compositepro. Unfortunately we cannot change the device, it already uses a positive displacement system to push the paste through the nozzles, but we can't add a feedback control in the device, since it's only about 1" x 0.5" x 0.25". I'll check out the link.

THat's my theory as well, SuperSalad, but I'm not a chemist and our chemist says that because the viscosity of our paste emulsion is so high it is very unlikely that it would absorb water. Assuming he's correct, would there be anything else that could be at play here? Our flow test occurs at...

Compositepro, It certainly is thixotropic, but does that mean that it could be settling just sitting in it's storage container causing a decrease in viscosity?

We have an oil in water emulsion, with a very low percentage of water (~7%) and a very high percentage of fine particles (~20 micron). It resembles a thick paste similar to cream cheese. We are using a small nozzle system to control the flow (which is very likely plug flow) of the paste to...

Kjoiner, yes, that would work fine, but unfortunately it's not practical for this application since it's a disposable medical device.

GSTP, there would be 8 syringes since it's a two-part system that needs to mix before injecting into each line. I'll have to look into flow dividers.

I do like 3DDave's idea, but there would be 8 syringes ganged together. I guess I'll have to give it a try.

GrouchyStressedTensePoor, can you explain what you mean by a spool type flow divider?

Thanks for the reply, the flow/pressure won't be constant, it will be coming from a syringe that someone will be manually applying pressure to a single outlet that will be split into 4 lines, each line going to a separate needle. I don't need equal flow exactly but if all of the nozzles can be...

I'm working on a design for a device that infuses a slightly viscous material (~7cP) through 4 small nozzles. The nozzles will be embedded into tissue and will likely have different resistance to flow. In order to eliminate the possibility that all of the material will flow through the needle...