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Recent content by chaving

  1. chaving

    multi-shot molder

    Dear Plasticguy, I am based in Bangkok Thailand and have 3 x 2 shot Nissei 120 ton machines with full capacity available. The machines are parallel configuration and the moving platen utalizes a turntable. Previously we were producing PC + EPDM PCB mounting rails for Dell, however due to a...
  2. chaving

    stack moulds

    You need to consider your injection pressure, pressure distribution , opening stroke, ejection and feed system very carefully. With the current details it is not possible to recomend how to work it. If you want to contact me and talk about this in detail please feel free chaving@yahoo.com
  3. chaving

    making mold for carbon fibre

    If you plan to fabricate the chair you may be able to get stantard lengths of carbon fibre tube that have been filament wound.
  4. chaving

    Automotive plastic bumper covers/shells

    Hi Speedguy, Please send me your e-mail, I have some pictures of components that we are producing for the motorcycle racing guys, fairings and tail pieces ect... It is all quite low volume but the pricing seems to be OK and the quality is very good. chaving@yahoo.com
  5. chaving

    Trying to mold plexiglass, lexan, or a clear plastic sheeting

    The most suitable material aould be Polycarbonate, however forming it could be quite hard as it must be heated to about 250 to soften it. Depending on the thickness it may be possible to vacuum form your shape, the best company to perform this would be a prototype house or maybee a local...
  6. chaving

    shape memory polymers

    A shape memory polymer is a polymer that after moulded can be deformed. The deformation is permanent until heat is applied and then it returns to it's pre-formed shape. Auto-motive companies were looking at this 10 years ago for body panels .. guess they wanted to loose the technology because I...
  7. chaving

    Mold Inserts from Chinese source???

    When dealing with Asian tooling my experience is you have to look at the knowledge base. Here in Thailand a very high percentage of moulds are produced using Japanese design principals, these very often produce a cost efficient mould but also a highly in-efficient process. Normally everything...
  8. chaving

    How is a mold grained??

    I am not sure what detail you got on the actual process from the websites, but how they actually do it is to etch with acid. The texture exist as standard negatives (as in photo negatives), these are positioned onto the mould serface and the acid is aplied. Time determines the depth of etch...
  9. chaving

    All voids are trapped gas?

    Voids are a vacuum and are caused by differential skrinkage, they are affected by hold pressure, hold time, melt temp, mould temperature and gate size. Air bubbles, comonly incorectly are refered to as voids and are caused by volitiles in the melt, this could be in the form of water vapour or...
  10. chaving

    Chrome plating on plastic bumper faces

    It may be possible to produce the parts in fibre glass, paint them with a conductive primer and then chrome plate them.
  11. chaving

    Uneven Wear

    Because you have not said otherwise I asume your two rotaing disks are the same material, this is going to give all sorts of problems because they will be trying to weld themselves together when they get warm. Try to use 2 different hardnesses of the same material (maybe add a filler to one) or...
  12. chaving

    Automotive plastic bumper covers/shells

    If you are going to go to the extents of making a male form out of wood you should consider vacuum forming your skin out of pp/epdm, but as always you will be looking at production volumes to pay off the cost of the mould. Just as a hint injection moulded bumpers are normally 2 to 2,5 mm thick...
  13. chaving

    Roll on deoderant balls

    There are very few compaies actualy doing it here, it seems to be a bit of a licensed monopoly. However the info you gave me was pretty correct. Thanks for your reply. Chaving
  14. chaving

    PLASTIC COMPRESSION

    Then why don't you machine them on a lathe ?
  15. chaving

    PLASTIC COMPRESSION

    How many peices will you need ?
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