Compression aqueous 1

[lcfigueiredo]

Hello all,

I am developing a study of a new material and I came across the problem that seems to have no solution ...

The material that I am developing is an aqueous suspension with small particles of paper ... let us consider for example the effect of pulp ...

What I wanted was to find a way to get "shed" the material into a mold and some system or method (high pressure, vacuum, or whatever it is) able to remove all excess water and compact the material ...

Look at what happens when we have a bit of pulp (just an example of having a bit of toilet paper soaked in water) in hand and shook his hand ...happens that eliminated almost all the water and the paper is compacted ... want to do this but even within a mold that has to be rigid to maintain the desired shape at the end ..

I hope someone could help me in this!

Thanks,
Lcfigueiredo

 

[patprimmer]

What is your problem exactly, or do you want someone to design your mould including concept stage to finished and proved mould?

Regards
Pat
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[MikeHalloran]

Get someone to explain how a papermaking machine works, or better yet, show you one in operation.

At least Google Fourdrinier.



Mike Halloran
Pembroke Pines, FL, USA

 

[bobslo]

Basically you can do this way:
- suspension must be well mixed, then
- pour the mixture in the container (one side of the cavity)
- drive (pneumatic driven) the container to other side of the cavity (usually fixed side). This cavity needs to have a lot of small holes all over the surface and applied vacuum in order to suck the water out.
- when the water is sucked-out, shut the vacuum of, remove the contained and through same line which was used for vacuum put in compressed air in order to eject the part.

Regards

 

[lcfigueiredo]

Hi all,

Bolboso, the problema is the soluciona you sugest only work for panel right? I would like to use the material with moulds like this:

http://www.bombayharbor.com/Product/26612/Plastic_Chair_Mould.html

 

[patprimmer]

Your process from the extremely limited information seems like a paper making process. The technology is well established and is in cheap moulds that do not need to withstand extreme pressure. They might be made of wood or aluminium.

The moulds you show are for injection moulding thermoplastics, They are normally made of high grade tool steel and cost a lot. They withstand injection pressures of over 20,000psi (well over 1000 bar) and temperatures over 250 deg C

We cannot reconcile the differences.

Regards
Pat
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[bobslo]

Process described in previous post can be used for formed shapes as well. Generally has the fixed mold defined shape and the container has flat bottom. Reason for this is in material volume deviation form "shot-to-shot" and there-fore uneven wall thickness.
I never tried to use formed container bottom. Perhaps could work!

Regards